Embed video, get releases working

.gitignore

@@ -10,3 +10,4 @@
 *.bak
 *.lib
 capture/
+*.zip

README.md

@@ -0,0 +1,111 @@
+# DOS VGA Arena Shooter Game
+
+A Smash TV/Robotron-like game to help me learn a whole bunch of things
+about game programming, DOS & PC programming, x86 assembler & C, and VGA graphics!
+
+<center>
+    <iframe title="DOS Arena Game -- Version 1" width="560" height="315" src="https://makertube.net/videos/embed/027d4ca0-f9ed-4f0d-b47e-15b92a197b87" frameborder="0" allowfullscreen="" sandbox="allow-same-origin allow-scripts allow-popups"></iframe>
+</center>
+
+## Play!
+
+The latest build of the game is under Releases.
+[Send any feedback you wish](https://theindustriousrabbit.com/about) -- it's
+appreciated! -- but I really don't know when I'll get back to working on this.
+
+## Setup
+
+Builds are done on a host Linux system with Open Watcom 2.0 installed to
+a local directory. On my machine, that's `~/Applications/open-watcom-v2`.
+Tests and game are run in DOSBox-X.
+
+### Clone and build Open Watcom 2 for DOS cross-compilation
+
+You'll need to build Open Watcom 2 from source to get DOS compilation on Linux.
+[Follow the directions on their GitHub wiki](https://github.com/open-watcom/open-watcom-v2/wiki/Build).
+
+You may need DOSBox installed for the Open Watcom 2 build.
+
+### Modify `setup.sh` to use your local Open Watcom install
+
+Changing the path of `export WATCOM` should be enough
+
+### Install Ruby and the RMagick gem
+
+The spritesheet builder uses Ruby and RMagick to produce the x86 assembler
+spritesheets from `spritesheet.bmp`.
+
+### Install DOSBox-X
+
+I used [the Flatpak version](https://flathub.org/apps/com.dosbox_x.DOSBox-X) and created a wrapper script in my `PATH`:
+
+```sh
+#!/bin/sh
+
+flatpak run com.dosbox_x.DOSBox-X "$@"
+```
+
+### Try building the game & tests
+
+`bin/game` builds and runs `game.exe` and `bin/test` builds and runs the
+unit tests.
+
+### Make a release
+
+`bin/release` makes `release.zip` which contains the game and the DOS/4GW
+wrapper.
+
+## What's in here?
+
+### System access code
+
+Everything in the `system` folder is about directly accessing the PC hardware:
+
+* `keyboard.c` accepts keyboard input using a keyboard interrupt.
+* `mouse_io.c` accepts mouse input.
+* `pc_stuff.c` does various PC things with interrupts.
+* `vga.c` accesses the VGA card and has drawing routines built for
+  32-bit protected mode code and using the 320x200x256 chained VGA mode (mode 10h).
+
+### Unit tests
+
+I'm using the [CuTest](https://github.com/ennorehling/cutest) library to write basic unit tests for the game.
+I wanted to try out C unit testing and see what libraries could work on
+retro machines, and CuTest fit the bill. The tests run directly in DOS.
+
+### Compiled sprites
+
+I automated the pipeline to building compiled sprites from a bitmap file.
+Originally, I was doing memory copies from that bitmap file, and no matter
+how much I optimized them, they were slow slow slow. Having Ruby build the
+sprites as a series of `mov` instructions sped up the game immensely.
+
+### Inline assembler
+
+There's some non-trivial inline assembler in `system/vga.c` for drawing
+font glyphs. https://github.com/dhepper/font8x8 is the source of the
+font. I probably could have gotten the performance fast enough in pure C,
+but I really wanted to try some inline assembler.
+
+### Bitmap loading code
+
+Before switching to compiled sprites, I wrote code to load BMP files to
+a memory location of your choosing, as well as to extract the palette for
+feeding to the VGA card.
+
+### Open Watcom `wmake` Makefiles
+
+The `Makefile`s are not sophisticated, but it took me quite a while to
+research Open Watcom's slightly different syntax for `Makefiles`. The GNU
+make docs didn't help too much.
+
+## License
+
+MIT License on the code. If you use any code verbatim, or do anything else with this,
+let me know!
+
+CuTest has its own license.
+
+Any art that's not the spritesheet is (C) John Bintz, all rights reserved. That
+should only be the `chicken.bmp` file that's used as an example for
+bitmap loading code.

bin/build_spritesheet_asm.rb

@@ -39,10 +39,15 @@ MovBytePtr = Data.define(:offset, :data)
 ASM_TEMPLATE = <<~ASM
   <% sprites.each  do |sprite| %>
   PUBLIC <%= sprite.exported_name %><% end %>
+  PUBLIC _palette
 
   .386
   .model flat,c
 
+  .DATA
+  _palette:
+  <%= palette.flat_map { |color| color.to_asm_struct }.join("\n") %>
+
   .CODE
 
   <% sprites.each  do |sprite| %>
@@ -60,11 +65,16 @@ ASM_TEMPLATE = <<~ASM
   end
 ASM
 
-C_TEMPLATE = <<~C
+H_TEMPLATE = <<~H
   #ifndef __SPRITES_H__
   #define __SPRITES_H__
 
   #include "types.h"
+  #include "system/vga.h"
+
+  #define PALETTE_COLOR_COUNT (<%= palette.length %>)
+
+  extern struct VGAColor palette[<%= palette.length %>];
 
   <% sprites.each  do |sprite| %>
   extern void <%= sprite.function_name %>(byte *);
@@ -74,7 +84,7 @@ C_TEMPLATE = <<~C
   <% end  %>
 
   #endif
-C
+H
 
 class AssemblerSprite
   def initialize(
@@ -144,9 +154,33 @@ screen = Screen.new(
 
 sprite_data = []
 
+palette = nil
+
+VGAColor = Data.define(:red, :green, :blue) do
+  def to_asm_struct
+    [
+      "  BYTE #{red}",
+      "  BYTE #{green}",
+      "  BYTE #{blue}"
+    ]
+  end
+end
+
 data["files"].each do |spritesheet|
   image = Magick::Image.read(spritesheet["file"]).first
 
+  unless palette
+    palette = image.colors.times.map do |i|
+      pixel = Magick::Pixel.from_color(image.colormap(i))
+
+      VGAColor.new(
+        red: pixel.red >> 10,
+        green: pixel.green >> 10,
+        blue: pixel.blue >> 10
+      )
+    end
+  end
+
   spritesheet["sprites"].each do |name, details|
     sprite_data << SpriteData.new(
       image:,
@@ -179,12 +213,13 @@ sprites = sprite_data.map do |sd|
   )
 end
 
+
 File.open('sprites.asm', 'w') do |fh|
   fh.puts ERB.new(ASM_TEMPLATE).result_with_hash(sprites:)
 end
 
 File.open('sprites.h', 'w') do |fh|
-  fh.puts ERB.new(C_TEMPLATE).result_with_hash(sprites:)
+  fh.puts ERB.new(H_TEMPLATE).result_with_hash(sprites:, palette:)
 end
 
 puts "sprites.{asm,h} written"

bin/game

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+wmake clean && wmake && dosbox-x -nolog game.exe

bin/release

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+wmake clean && wmake
+cp $WATCOM/binw/dos4gw.exe .
+zip -u release.zip game.exe dos4gw.exe

bin/test

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+wmake clean && wmake test && dosbox-x -c 132x60 -nolog test.exe
+

build.bat

@@ -1,7 +0,0 @@
-wcc386.exe -q bmp_loader.c
-wcc386.exe -q mouse_io.c
-wcc386.exe -q pc_stuff.c
-wcc386.exe -q vga.c
-wcc386.exe -q keyboard.c
-wcl386.exe -q game.c bmp_load.obj mouse_io.obj pc_stuff.obj vga.obj keyboard.obj
-

combat.c

@@ -2,11 +2,12 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-#include "game.h"
+#include "system/vga.h"
 
+#include "game.h"
+#include "powerup.h"
 #include "movement.h"
 #include "const.h"
-#include "system/vga.h"
 
 void setupBullet(
   struct BulletPosition *bullet,
@@ -38,13 +39,33 @@ void setupBullet(
   bullet->velocityStep = 0;
 }
 
+int maybeFireShotCount(
+  struct BulletPosition rabbitBulletPosition[],
+  int availableBullets[],
+  int count
+) {
+  int i, remaining = count;
+
+  for (i = 0; i < RABBIT_BULLET_LIMIT; ++i) {
+    if (rabbitBulletPosition[i].isActive == 0) {
+      availableBullets[count - remaining] = i;
+
+      remaining--;
+      if (remaining == 0) break;
+    }
+  }
+
+  return remaining == 0;
+}
+
 int attemptToFireRabbitBullet(
   struct RabbitPosition *rabbitPosition,
   struct RabbitWeaponry *rabbitWeaponry,
   struct BulletPosition rabbitBulletPosition[]
 ) {
   int okToFire = 0, i, mouseAngle;
-  int availableBullets[3];
+  int availableBullets[4];
+  float beamOffsetX, beamOffsetY;
 
   if (rabbitWeaponry->cooldown > 0) return 0;
   mouseAngle = rabbitPosition->mouseAngle;
@@ -52,15 +73,11 @@ int attemptToFireRabbitBullet(
   rabbitWeaponry->cooldown = RABBIT_BULLET_COOLDOWN;
 
   if (rabbitWeaponry->currentWeapon == WEAPON_TYPE_SINGLE_SHOT_GUN) {
-    for (i = 0; i < RABBIT_BULLET_LIMIT; ++i) {
+    if (!maybeFireShotCount(
-      if (rabbitBulletPosition[i].isActive == 0) {
+      rabbitBulletPosition,
-        okToFire = 1;
+      availableBullets,
-        availableBullets[0] = i;
+      1
-        break;
+    )) return 0;
-      }
-    }
-
-    if (!okToFire) return 0;
 
     setupBullet(
       &rabbitBulletPosition[availableBullets[0]],
@@ -71,14 +88,11 @@ int attemptToFireRabbitBullet(
     );
   } else if (rabbitWeaponry->currentWeapon == WEAPON_TYPE_SPREAD_SHOT_GUN) {
     // make sure three bullets are available
-    for (i = 0; i < RABBIT_BULLET_LIMIT; ++i) {
+    if (!maybeFireShotCount(
-      if (rabbitBulletPosition[i].isActive == 0) {
+      rabbitBulletPosition,
-        availableBullets[okToFire++] = i;
+      availableBullets,
-        if (okToFire == 3) break;
+      3
-      }
+    )) return 0;
-    }
-
-    if (okToFire < 3) return 0;
 
     // if so, fire away
     for (i = 0; i < 3; ++i) {
@@ -90,6 +104,27 @@ int attemptToFireRabbitBullet(
         RABBIT_BULLET_VELOCITY
       );
     }
+  } else if (rabbitWeaponry->currentWeapon == WEAPON_TYPE_BEAM_SHOT_GUN) {
+    // make sure two bullets are available
+    if (!maybeFireShotCount(
+      rabbitBulletPosition,
+      availableBullets,
+      2
+    )) return 0;
+
+    // if so, fire away
+    for (i = 0; i < 2; ++i) {
+      beamOffsetX = sin(mouseAngle * DEG2RAD) * i * 2;
+      beamOffsetY = -cos(mouseAngle * DEG2RAD) * i * 2;
+
+      setupBullet(
+        &rabbitBulletPosition[availableBullets[i]],
+        rabbitPosition->rabbitPosition[0] + beamOffsetX,
+        rabbitPosition->rabbitPosition[1] + beamOffsetY,
+        mouseAngle,
+        RABBIT_BULLET_VELOCITY
+      );
+    }
   }
 
   return 1;
@@ -232,8 +267,8 @@ int rabbitBulletGrid[4][RABBIT_BULLET_LIMIT];
 int enemyGrid[4][ENEMY_MAX_COUNT];
 int enemyBulletGrid[4][ENEMY_BULLET_LIMIT];
 int rabbitBulletGridIndex[4],
-    enemyGridIndex[4],
+enemyGridIndex[4],
-    enemyBulletGridIndex[4];
+enemyBulletGridIndex[4];
 int gridPosition[4];
 
 #define CALCULATE_GRID_POS(x,y) ((x / COLLISION_GRID_SIZE) + (y / COLLISION_GRID_SIZE) * 2)
@@ -261,6 +296,7 @@ void buildCollisionGrids(
   struct PlayerPowerup *playerPowerup
 ) {
   int grid, i;
+  struct CompiledSpriteRender *which;
 
   for (grid = 0; grid < 4; ++grid) {
     rabbitBulletGridIndex[grid] = 0;
@@ -278,17 +314,17 @@ void buildCollisionGrids(
 
   switch (playerPowerup->type) {
     case POWERUP_TYPE_SHOTGUN:
-      shotgun.x = playerPowerup->x;
+      which = &shotgun;
-      shotgun.y = playerPowerup->y;
-      determineGridPositionsForSprite(&shotgun);
       break;
-    case POWERUP_TYPE_SHIELD_KILLER:
+    case POWERUP_TYPE_BEAM_WEAPON:
-      shieldKiller.x = playerPowerup->x;
+      which = &beam;
-      shieldKiller.y = playerPowerup->y;
-      determineGridPositionsForSprite(&shieldKiller);
       break;
   }
 
+  which->x = playerPowerup->x;
+  which->y = playerPowerup->y;
+  determineGridPositionsForSprite(which);
+
   for (grid = 0; grid < 4; ++grid) {
     powerupGrid[grid] = gridPosition[grid];
   }
@@ -374,8 +410,6 @@ int handleEnemyBulletToRabbitCollisions(
   return hitCount;
 }
 
-#define KNOCKBACK_DISTANCE (3)
-
 void knockbackEnemy(
   struct EnemyPosition *enemy,
   int angle
@@ -390,7 +424,8 @@ void knockbackEnemy(
 
 void handleRabbitBulletToEnemyCollisions(
   struct BulletPosition rabbitBulletPosition[],
-  struct EnemyPosition enemyPosition[]
+  struct EnemyPosition enemyPosition[],
+  struct RabbitWeaponry *rabbitWeaponry
 ) {
   int bulletIdx, enemyIdx, grid;
   int resolvedBulletIdx, resolvedEnemyIdx;
@@ -413,7 +448,7 @@ void handleRabbitBulletToEnemyCollisions(
         populateTargetCollision(&enemy);
 
         if (isCollision()) {
-          enemyPosition[resolvedEnemyIdx].hitPoints--;
+          enemyPosition[resolvedEnemyIdx].hitPoints -= rabbitWeaponry->damage;
           if (enemyPosition[resolvedEnemyIdx].hitPoints < 1) {
             enemyPosition[resolvedEnemyIdx].willBeInactive = 1;
             enemyPosition[resolvedEnemyIdx].wasKilled = 1;
@@ -463,6 +498,8 @@ int handleRabbitToPowerupCollision(
   struct RabbitPosition *rabbitPosition,
   struct PlayerPowerup *playerPowerup
 ) {
+  struct CompiledSpriteRender *which;
+
   if (!playerPowerup->isActive) return 0;
 
   rabbit.x = rabbitPosition->rabbitPosition[0];
@@ -471,16 +508,84 @@ int handleRabbitToPowerupCollision(
 
   switch (playerPowerup->type) {
     case POWERUP_TYPE_SHOTGUN:
-      shotgun.x = playerPowerup->x;
+      which = &shotgun;
-      shotgun.y = playerPowerup->y;
-      populateTargetCollision(&shotgun);
       break;
-    case POWERUP_TYPE_SHIELD_KILLER:
+    case POWERUP_TYPE_BEAM_WEAPON:
-      shieldKiller.x = playerPowerup->x;
+      which = &beam;
-      shieldKiller.y = playerPowerup->y;
-      populateTargetCollision(&shieldKiller);
       break;
   }
 
+  which->x = playerPowerup->x;
+  which->y = playerPowerup->y;
+  populateTargetCollision(which);
+
   return isCollision();
 }
+
+int processEnemyKillStates(
+  struct EnemyPosition enemyPosition[]
+) {
+  int i, currentKillCount = 0;
+
+  for (i = 0; i < ENEMY_MAX_COUNT; ++i) {
+    if (enemyPosition[i].wasKilled) {
+      enemyPosition[i].wasKilled = 0;
+      currentKillCount++;
+    }
+  }
+
+  return currentKillCount;
+}
+
+void handleEnemyKills(
+  struct EnemyPosition enemyPosition[],
+  struct GlobalGameState *globalGameState,
+  struct PlayerPowerup *playerPowerup,
+  struct RabbitWeaponry *rabbitWeaponry
+) {
+  int i, currentKillCount;
+  int originalDifficulty;
+  int healthIncrease;
+
+  currentKillCount = processEnemyKillStates(enemyPosition);
+
+  healthIncrease = globalGameState->healthGainPerKill * currentKillCount;
+  if (healthIncrease > 0) {
+    healthIncrease = rand() % healthIncrease + 1;
+
+    globalGameState->health += healthIncrease;
+    if (globalGameState->health > globalGameState->maxHealth) globalGameState->health = globalGameState->maxHealth;
+  }
+
+  globalGameState->kills += currentKillCount;
+
+  if (currentKillCount > 0) {
+    processPowerupCooldown(
+      playerPowerup,
+      globalGameState,
+      rabbitWeaponry,
+      currentKillCount
+    );
+
+    originalDifficulty = globalGameState->difficulty;
+
+    for (i = 0; i < MAX_DIFFICULTY; ++i) {
+      if (globalGameState->kills > difficultyBands[i]) {
+        globalGameState->difficulty = i + 1;
+      }
+    }
+
+    if (originalDifficulty != globalGameState->difficulty) {
+      globalGameState->coins += (globalGameState->difficulty - originalDifficulty);
+    }
+  }
+}
+
+void fireCurrentWeaponOnce(struct RabbitWeaponry *rabbitWeaponry) {
+  if (rabbitWeaponry->currentWeaponRemainingRounds > 0) {
+    rabbitWeaponry->currentWeaponRemainingRounds--;
+    if (rabbitWeaponry->currentWeaponRemainingRounds == 0) {
+      rabbitWeaponry->currentWeapon = WEAPON_TYPE_SINGLE_SHOT_GUN;
+    }
+  }
+}

combat.h

@@ -12,7 +12,8 @@ void advanceRabbitBullets(
 
 void handleRabbitBulletToEnemyCollisions(
   struct BulletPosition[],
-  struct EnemyPosition[]
+  struct EnemyPosition[],
+  struct RabbitWeaponry*
 );
 
 int handleRabbitToEnemyCollisions(
@@ -48,3 +49,18 @@ int handleRabbitToPowerupCollision(
   struct RabbitPosition *rabbitPosition,
   struct PlayerPowerup *playerPowerup
 );
+
+void handleEnemyKills(
+  struct EnemyPosition enemyPosition[],
+  struct GlobalGameState *globalGameState,
+  struct PlayerPowerup *playerPowerup,
+  struct RabbitWeaponry *rabbitWeaponry
+);
+
+void fireCurrentWeaponOnce(struct RabbitWeaponry*);
+
+int maybeFireShotCount(
+  struct BulletPosition rabbitBulletPosition[],
+  int availableBullets[],
+  int count
+);

combat_test.c

@@ -0,0 +1,159 @@
+#include "cutest-1.5/CuTest.h"
+#include "combat.h"
+
+#include "game.h"
+#include "movement.h"
+#include "const.h"
+#include "powerup.h"
+
+int processEnemyKillStates(struct EnemyPosition[]);
+
+void TestProcessEmenyKillStates(CuTest *tc) {
+  struct EnemyPosition enemyPosition[ENEMY_MAX_COUNT];
+  int i, result;
+
+  for (i = 0; i < ENEMY_MAX_COUNT; ++i) {
+    enemyPosition[i].wasKilled = 0;
+  }
+
+  enemyPosition[0].wasKilled = 1;
+  enemyPosition[ENEMY_MAX_COUNT - 1].wasKilled = 1;
+
+  result = processEnemyKillStates(enemyPosition);
+
+  CuAssertIntEquals(tc, 2, result);
+}
+
+void TestFireCurrentWeaponOnce_NoRoundsRemaining(CuTest *tc) {
+  struct RabbitWeaponry rabbitWeaponry;
+
+  rabbitWeaponry.currentWeaponRemainingRounds = 0;
+  rabbitWeaponry.currentWeapon = 99;
+
+  fireCurrentWeaponOnce(&rabbitWeaponry);
+
+  CuAssertIntEquals(tc, 99, rabbitWeaponry.currentWeapon);
+  CuAssertIntEquals(tc, 0, rabbitWeaponry.currentWeaponRemainingRounds);
+}
+
+void TestFireCurrentWeaponOnce_OneRoundRemaining(CuTest *tc) {
+  struct RabbitWeaponry rabbitWeaponry;
+
+  rabbitWeaponry.currentWeaponRemainingRounds = 1;
+  rabbitWeaponry.currentWeapon = 99;
+
+  fireCurrentWeaponOnce(&rabbitWeaponry);
+
+  CuAssertIntEquals(tc, WEAPON_TYPE_SINGLE_SHOT_GUN, rabbitWeaponry.currentWeapon);
+  CuAssertIntEquals(tc, 0, rabbitWeaponry.currentWeaponRemainingRounds);
+}
+
+void TestFireCurrentWeaponOnce_TwoRoundsRemaining(CuTest *tc) {
+  struct RabbitWeaponry rabbitWeaponry;
+
+  rabbitWeaponry.currentWeaponRemainingRounds = 2;
+  rabbitWeaponry.currentWeapon = 99;
+
+  fireCurrentWeaponOnce(&rabbitWeaponry);
+
+  CuAssertIntEquals(tc, 99, rabbitWeaponry.currentWeapon);
+  CuAssertIntEquals(tc, 1, rabbitWeaponry.currentWeaponRemainingRounds);
+}
+
+void TestMaybeFireShotCount_NotOK(CuTest *tc) {
+  struct BulletPosition rabbitBulletPosition[RABBIT_BULLET_LIMIT];
+  int availableBullets[1] = { -1 };
+  int i, result;
+
+  for (i = 0; i < RABBIT_BULLET_LIMIT; ++i) {
+    rabbitBulletPosition[i].isActive = 1;
+  }
+
+  result = maybeFireShotCount(
+    rabbitBulletPosition,
+    availableBullets,
+    1
+  );
+
+  CuAssertIntEquals(tc, 0, result);
+  CuAssertIntEquals(tc, availableBullets[0], -1);
+}
+
+void TestMaybeFireShotCount_OK(CuTest *tc) {
+  struct BulletPosition rabbitBulletPosition[RABBIT_BULLET_LIMIT];
+  int availableBullets[1] = { -1 };
+  int i, result;
+
+  for (i = 0; i < RABBIT_BULLET_LIMIT; ++i) {
+    rabbitBulletPosition[i].isActive = 1;
+  }
+
+  rabbitBulletPosition[4].isActive = 0;
+
+  result = maybeFireShotCount(
+    rabbitBulletPosition,
+    availableBullets,
+    1
+  );
+
+  CuAssertIntEquals(tc, 1, result);
+  CuAssertIntEquals(tc, availableBullets[0], 4);
+}
+
+void TestMaybeFireShotCount_NotEnoughAvailable(CuTest *tc) {
+  struct BulletPosition rabbitBulletPosition[RABBIT_BULLET_LIMIT];
+  int availableBullets[2] = { -1, -1 };
+  int i, result;
+
+  for (i = 0; i < RABBIT_BULLET_LIMIT; ++i) {
+    rabbitBulletPosition[i].isActive = 1;
+  }
+
+  rabbitBulletPosition[4].isActive = 0;
+
+  result = maybeFireShotCount(
+    rabbitBulletPosition,
+    availableBullets,
+    2
+  );
+
+  CuAssertIntEquals(tc, 0, result);
+  CuAssertIntEquals(tc, 4, availableBullets[0]);
+  CuAssertIntEquals(tc, -1, availableBullets[1]);
+}
+
+void TestMaybeFireShotCount_EnoughAvailable(CuTest *tc) {
+  struct BulletPosition rabbitBulletPosition[RABBIT_BULLET_LIMIT];
+  int availableBullets[2] = { -1, -1 };
+  int i, result;
+
+  for (i = 0; i < RABBIT_BULLET_LIMIT; ++i) {
+    rabbitBulletPosition[i].isActive = 1;
+  }
+
+  rabbitBulletPosition[4].isActive = 0;
+  rabbitBulletPosition[6].isActive = 0;
+
+  result = maybeFireShotCount(
+    rabbitBulletPosition,
+    availableBullets,
+    2
+  );
+
+  CuAssertIntEquals(tc, 1, result);
+  CuAssertIntEquals(tc, 4, availableBullets[0]);
+  CuAssertIntEquals(tc, 6, availableBullets[1]);
+}
+
+CuSuite *CombatGetSuite() {
+  CuSuite *suite = CuSuiteNew();
+  SUITE_ADD_TEST(suite, TestProcessEmenyKillStates);
+  SUITE_ADD_TEST(suite, TestFireCurrentWeaponOnce_NoRoundsRemaining);
+  SUITE_ADD_TEST(suite, TestFireCurrentWeaponOnce_OneRoundRemaining);
+  SUITE_ADD_TEST(suite, TestFireCurrentWeaponOnce_TwoRoundsRemaining);
+  SUITE_ADD_TEST(suite, TestMaybeFireShotCount_NotOK);
+  SUITE_ADD_TEST(suite, TestMaybeFireShotCount_OK);
+  SUITE_ADD_TEST(suite, TestMaybeFireShotCount_NotEnoughAvailable);
+  SUITE_ADD_TEST(suite, TestMaybeFireShotCount_EnoughAvailable);
+  return suite;
+}

const.c

@@ -0,0 +1,59 @@
+#include "system/vga.h"
+#include "const.h"
+
+int difficultyBands[MAX_DIFFICULTY];
+int hitPointRanges[MAX_DIFFICULTY][4];
+int damageUpgradeCosts[3] = { 5, 11, 18 };
+int healthUpgradeCosts[3] = { 4, 9, 15 };
+int healthGainUpgradeCosts[3] = { 6, 13, 21 };
+
+struct SpriteBounds bounds;
+
+// TODO: centralize these outside of game.c
+struct CompiledSpriteRender rabbit,
+  mouse,
+  bullet,
+  enemy,
+  enemyBullet,
+  shotgun,
+  beam;
+
+void buildDifficultyBands() {
+  int i;
+  float current = 0;
+  float increaseBy = BASE_KILLS;
+
+  for (i = 0; i < MAX_DIFFICULTY; ++i) {
+    current += increaseBy;
+
+    difficultyBands[i] = (int)current;
+
+    increaseBy *= KILLS_NEEDED_FOR_NEXT_LEVEL_MULTIPLIER;
+  }
+}
+
+void buildHitPointRages() {
+  int currentRange[4] = { 1, 1, 1, 1 };
+  int i, j, countOfCurrent = 0, tmp;
+
+  for (i = 0; i < MAX_DIFFICULTY; ++i) {
+    for (j = 0; j < 4; ++j) {
+      hitPointRanges[i][j] = currentRange[j];
+    }
+
+    countOfCurrent++;
+    if (countOfCurrent == HIT_POINT_DIFFICULTY_INCREASE_DELAY) {
+      countOfCurrent = 0;
+
+      currentRange[3]++;
+
+      for (j = 3; j > 0; --j) {
+        if (currentRange[j] > currentRange[j - 1]) {
+          tmp = currentRange[j - 1];
+          currentRange[j - 1] = currentRange[j];
+          currentRange[j] = tmp;
+        }
+      }
+    }
+  }
+};

const.h

@@ -1,13 +1,23 @@
+#ifndef __CONST_H__
+#define __CONST_H__
+
+#include "system/vga.h"
+
 #define TILE_SIZE (20)
 #define ARENA_WIDTH_TILES (10)
 #define ARENA_HEIGHT_TILES (10)
 #define COLLISION_GRID_SIZE (ARENA_WIDTH_TILES / 2 * TILE_SIZE)
 
+#define ARENA_LEFT_EDGE (TILE_SIZE)
+#define ARENA_TOP_EDGE (TILE_SIZE)
+#define ARENA_RIGHT_EDGE (ARENA_WIDTH_TILES - 1) * TILE_SIZE
+#define ARENA_BOTTOM_EDGE (ARENA_WIDTH_TILES - 1) * TILE_SIZE
+
 #define MOUSE_DISTANCE (32)
 
 #define RABBIT_MOTION_DRAG (2)
 #define RABBIT_MOTION_ACCELERATION (5)
-#define RABBIT_MOTION_MAX_SPEED (12)
+#define RABBIT_MOTION_MAX_SPEED (10)
 #define RABBIT_MOTION_VELOCITY_DECAY (5)
 
 #define RABBIT_BULLET_LIMIT (9)
@@ -28,25 +38,60 @@
 #define DEG2RAD (3.14159/180)
 
 #define ENEMY_MAX_COUNT (50)
-#define ENEMY_BULLET_LIMIT (ENEMY_MAX_COUNT / 4)
+#define ENEMY_BULLET_LIMIT (ENEMY_MAX_COUNT / 5)
 
 #define ENEMY_MOVE_SPEED (1)
 #define ENEMY_MOVE_DELAY (3)
-#define ENEMY_BULLET_VELOCITY (RABBIT_BULLET_VELOCITY - 2)
+#define ENEMY_BULLET_VELOCITY (RABBIT_BULLET_VELOCITY - 1)
 
-#define ENEMY_FIRE_MIN_DELAY (45)
+#define ENEMY_FIRE_MIN_DELAY (50)
 #define ENEMY_FIRE_VARIABLE_DELAY (60)
 
 #define ENEMY_BULLET_DAMAGE (3)
 #define ENEMY_COLLISION_DAMAGE (6)
-#define ENEMY_KILL_HEALTH_GAIN (1)
 #define ENEMY_HIT_POINT_DIFFICULTY_INCREASE_EVERY (4)
 
 #define BASE_ENEMY_SPAWN_COOLDOWN (30)
-#define DIFFICULTY_SPAWN_COOLDOWN_REDUCTION (2)
+#define DIFFICULTY_SPAWN_COOLDOWN_REDUCTION (1)
 #define MINIMUM_ENEMY_SPAWN_COOLDOWN (3)
 #define VARIABLE_ENEMY_SPAWN_COOLDOWN (10)
 
 #define POWERUP_RESPAWN_COOLDOWN_PER_LEVEL (10)
 
 #define SHOTGUN_ROUNDS_PER_LEVEL (25)
+#define MAX_DIFFICULTY (40)
+#define BASE_KILLS (20)
+#define KILLS_NEEDED_FOR_NEXT_LEVEL_MULTIPLIER (1.06)
+#define HIT_POINT_DIFFICULTY_INCREASE_DELAY (4)
+
+#define WEAPON_TYPE_SINGLE_SHOT_GUN (0)
+#define WEAPON_TYPE_SPREAD_SHOT_GUN (1)
+#define WEAPON_TYPE_BEAM_SHOT_GUN (2)
+
+#define POWERUP_TYPE_SHOTGUN (1)
+#define POWERUP_TYPE_BEAM_WEAPON (2)
+
+#define KNOCKBACK_DISTANCE (3)
+
+#define HEALTH_UPGRADE_GAIN (10)
+
+extern int difficultyBands[];
+extern int hitPointRanges[MAX_DIFFICULTY][4];
+
+extern int damageUpgradeCosts[];
+extern int healthUpgradeCosts[];
+extern int healthGainUpgradeCosts[];
+
+extern struct SpriteBounds bounds;
+extern struct CompiledSpriteRender rabbit,
+  mouse,
+  bullet,
+  enemy,
+  enemyBullet,
+  shotgun,
+  beam;
+
+void buildDifficultyBands();
+void buildHitPointRages();
+
+#endif

const_test.c

@@ -0,0 +1,28 @@
+#include "cutest-1.5/CuTest.h"
+#include "const.h"
+#include <stdio.h>
+
+void TestBuildDifficultyBands(CuTest *tc) {
+
+  buildDifficultyBands();
+
+  CuAssertIntEquals(tc, 20, difficultyBands[0]);
+  CuAssertIntEquals(tc, 41, difficultyBands[1]);
+  CuAssertIntEquals(tc, 3095, difficultyBands[MAX_DIFFICULTY - 1]);
+}
+
+void TestBuildHitPointRanges(CuTest *tc) {
+  buildHitPointRages();
+
+  CuAssertIntEquals(tc, 1, hitPointRanges[0][0]);
+  CuAssertIntEquals(tc, 1, hitPointRanges[1][0]);
+  CuAssertIntEquals(tc, 2, hitPointRanges[4][0]);
+  CuAssertIntEquals(tc, 1, hitPointRanges[4][3]);
+}
+
+CuSuite *ConstGetSuite() {
+  CuSuite *suite = CuSuiteNew();
+  SUITE_ADD_TEST(suite, TestBuildDifficultyBands);
+  SUITE_ADD_TEST(suite, TestBuildHitPointRanges);
+  return suite;
+}

cutest-1.5/CuTest.c

@@ -1,3 +1,6 @@
+#ifdef _MSC_VER
+#define _CRT_SECURE_NO_WARNINGS
+#endif
 #include <assert.h>
 #include <setjmp.h>
 #include <stdlib.h>
@@ -11,7 +14,7 @@
  * CuStr
  *-------------------------------------------------------------------------*/
 
-char* CuStrAlloc(int size)
+char* CuStrAlloc(size_t size)
 {
 	char* newStr = (char*) malloc( sizeof(char) * (size) );
 	return newStr;
@@ -19,7 +22,7 @@ char* CuStrAlloc(int size)
 
 char* CuStrCopy(const char* old)
 {
-	int len = strlen(old);
+	size_t len = strlen(old);
 	char* newStr = CuStrAlloc(len + 1);
 	strcpy(newStr, old);
 	return newStr;
@@ -54,7 +57,7 @@ void CuStringDelete(CuString *str)
         free(str);
 }
 
-void CuStringResize(CuString* str, int newSize)
+void CuStringResize(CuString* str, size_t newSize)
 {
 	str->buffer = (char*) realloc(str->buffer, sizeof(char) * newSize);
 	str->size = newSize;
@@ -62,7 +65,7 @@ void CuStringResize(CuString* str, int newSize)
 
 void CuStringAppend(CuString* str, const char* text)
 {
-	int length;
+	size_t length;
 
 	if (text == NULL) {
 		text = "NULL";
@@ -93,9 +96,9 @@ void CuStringAppendFormat(CuString* str, const char* format, ...)
 	CuStringAppend(str, buf);
 }
 
-void CuStringInsert(CuString* str, const char* text, int pos)
+void CuStringInsert(CuString* str, const char* text, size_t pos)
 {
-	int length = strlen(text);
+    size_t length = strlen(text);
 	if (pos > str->length)
 		pos = str->length;
 	if (str->length + length + 1 >= str->size)
@@ -129,6 +132,7 @@ CuTest* CuTestNew(const char* name, TestFunction function)
 void CuTestDelete(CuTest *t)
 {
         if (!t) return;
+        CuStringDelete(t->message);
         free(t->name);
         free(t);
 }
@@ -153,7 +157,9 @@ static void CuFailInternal(CuTest* tc, const char* file, int line, CuString* str
 	CuStringInsert(string, buf, 0);
 
 	tc->failed = 1;
-	tc->message = string->buffer;
+        free(tc->message);
+        tc->message = CuStringNew();
+        CuStringAppend(tc->message, string->buffer);
 	if (tc->jumpBuf != 0) longjmp(*(tc->jumpBuf), 0);
 }
 
@@ -327,7 +333,7 @@ void CuSuiteDetails(CuSuite* testSuite, CuString* details)
 			{
 				failCount++;
 				CuStringAppendFormat(details, "%d) %s: %s\n",
-					failCount, testCase->name, testCase->message);
+					failCount, testCase->name, testCase->message->buffer);
 			}
 		}
 		CuStringAppend(details, "\n!!!FAILURES!!!\n");

cutest-1.5/CuTest.h

@@ -3,12 +3,13 @@
 
 #include <setjmp.h>
 #include <stdarg.h>
+#include <stddef.h>
 
-#define CUTEST_VERSION  "CuTest 1.5"
+#define CUTEST_VERSION  "CuTest 1.5c"
 
 /* CuString */
 
-char* CuStrAlloc(int size);
+char* CuStrAlloc(size_t size);
 char* CuStrCopy(const char* old);
 
 #define CU_ALLOC(TYPE)		((TYPE*) malloc(sizeof(TYPE)))
@@ -19,8 +20,8 @@ char* CuStrCopy(const char* old);
 
 typedef struct
 {
-	int length;
+    size_t length;
-	int size;
+    size_t size;
 	char* buffer;
 } CuString;
 
@@ -30,8 +31,8 @@ void CuStringRead(CuString* str, const char* path);
 void CuStringAppend(CuString* str, const char* text);
 void CuStringAppendChar(CuString* str, char ch);
 void CuStringAppendFormat(CuString* str, const char* format, ...);
-void CuStringInsert(CuString* str, const char* text, int pos);
+void CuStringInsert(CuString* str, const char* text, size_t pos);
-void CuStringResize(CuString* str, int newSize);
+void CuStringResize(CuString* str, size_t newSize);
 void CuStringDelete(CuString* str);
 
 /* CuTest */
@@ -46,7 +47,7 @@ struct CuTest
 	TestFunction function;
 	int failed;
 	int ran;
-	const char* message;
+	CuString *message;
 	jmp_buf *jumpBuf;
 };
 
@@ -86,8 +87,8 @@ void CuAssertPtrEquals_LineMsg(CuTest* tc,
 #define CuAssertPtrEquals(tc,ex,ac)           CuAssertPtrEquals_LineMsg((tc),__FILE__,__LINE__,NULL,(ex),(ac))
 #define CuAssertPtrEquals_Msg(tc,ms,ex,ac)    CuAssertPtrEquals_LineMsg((tc),__FILE__,__LINE__,(ms),(ex),(ac))
 
-#define CuAssertPtrNotNull(tc,p)        CuAssert_Line((tc),__FILE__,__LINE__,"null pointer unexpected",(p != NULL))
+#define CuAssertPtrNotNull(tc,p)        CuAssert_Line((tc),__FILE__,__LINE__,"null pointer unexpected",((p) != NULL))
-#define CuAssertPtrNotNullMsg(tc,msg,p) CuAssert_Line((tc),__FILE__,__LINE__,(msg),(p != NULL))
+#define CuAssertPtrNotNullMsg(tc,msg,p) CuAssert_Line((tc),__FILE__,__LINE__,(msg),((p) != NULL))
 
 /* CuSuite */
 

game.c

@@ -18,16 +18,7 @@
 #include "combat.h"
 #include "game.h"
 #include "spawn.h"
-
+#include "powerup.h"
-// TODO: centralize these outside of game.c
-struct CompiledSpriteRender rabbit,
-  mouse,
-  bullet,
-  enemy,
-  enemyBullet,
-  shotgun,
-  shieldKiller;
-struct SpriteBounds bounds;
 
 struct BMPImage spritesheetImage;
 struct VGAColor vgaColors[256];
@@ -50,6 +41,19 @@ struct BulletPosition enemyBulletPosition[ENEMY_BULLET_LIMIT];
 struct RabbitWeaponry rabbitWeaponry;
 struct PlayerPowerup playerPowerup;
 
+struct GlobalGameState globalGameState = {
+  .spawnCooldown = 0,
+  .difficulty = 0,
+  .kills = 0,
+  .coins = 0,
+  .health = RABBIT_HEALTH_MAX,
+  .maxHealth = RABBIT_HEALTH_MAX,
+  .healthGainPerKill = 1,
+  .damageUpgradeLevel = 0,
+  .healthUpgradeLevel = 0,
+  .healthGainUpgradeLevel = 0
+};
+
 void setupRabbitBullets() {
   int i;
 
@@ -61,12 +65,13 @@ void setupRabbitBullets() {
   rabbitWeaponry.cooldown = 0;
   rabbitWeaponry.currentWeapon = WEAPON_TYPE_SINGLE_SHOT_GUN;
   rabbitWeaponry.currentWeaponRemainingRounds = 0;
+  rabbitWeaponry.damage = 1;
 }
 
 void setupPowerup() {
   playerPowerup.x = 100;
   playerPowerup.y = 100;
-  playerPowerup.cooldown = 20 + rand() % 10;
+  playerPowerup.cooldown = determinePowerupCooldownTime(globalGameState.difficulty);
   playerPowerup.type = POWERUP_TYPE_SHOTGUN;
   playerPowerup.isActive = 0;
 }
@@ -89,54 +94,6 @@ void setupEnemies() {
   }
 }
 
-struct GlobalGameState globalGameState = {
-  .spawnCooldown = 0,
-  .difficulty = 0
-};
-
-int kills = 0;
-int health = RABBIT_HEALTH_MAX;
-
-int difficultyBands[10] = { 10, 20, 30, 50, 80, 130, 210, 340, 550, 890 };
-
-void handleEnemyKills() {
-  int i, hadKill, currentKillCount;
-
-  currentKillCount = 0;
-
-  for (i = 0; i < ENEMY_MAX_COUNT; ++i) {
-    if (enemyPosition[i].wasKilled) {
-      enemyPosition[i].wasKilled = 0;
-      kills++;
-      currentKillCount++;
-      health += ENEMY_KILL_HEALTH_GAIN;
-      if (health > RABBIT_HEALTH_MAX) health = RABBIT_HEALTH_MAX;
-
-      hadKill = 1;
-    }
-  }
-
-  kills += currentKillCount;
-
-  playerPowerup.cooldown -= currentKillCount;
-  if (playerPowerup.cooldown <= 0) {
-    playerPowerup.x = TILE_SIZE + rand() % ((ARENA_WIDTH_TILES - 2) * TILE_SIZE);
-    playerPowerup.y = TILE_SIZE + rand() % ((ARENA_HEIGHT_TILES - 2) * TILE_SIZE);
-    playerPowerup.isActive = 1;
-
-    playerPowerup.cooldown = POWERUP_RESPAWN_COOLDOWN_PER_LEVEL * globalGameState.difficulty +
-      rand() % (POWERUP_RESPAWN_COOLDOWN_PER_LEVEL * globalGameState.difficulty);
-  }
-
-  if (hadKill) {
-    for (i = 0; i < 10; ++i) {
-      if (kills > difficultyBands[i]) {
-        globalGameState.difficulty = i + 1;
-      }
-    }
-  }
-}
-
 void setupEnemySprites() {
   buildCompiledSprite(
     &sprite_enemy,
@@ -197,12 +154,12 @@ void setupPowerupSprites() {
   );
 
   buildCompiledSprite(
-    &sprite_shieldKiller,
+    &sprite_beam,
-    &shieldKiller,
+    &beam,
-    SPRITE_SHIELDKILLER_WIDTH,
+    SPRITE_BEAM_WIDTH,
-    SPRITE_SHIELDKILLER_HEIGHT,
+    SPRITE_BEAM_HEIGHT,
-    SPRITE_SHIELDKILLER_OFFSET_X,
+    SPRITE_BEAM_OFFSET_X,
-    SPRITE_SHIELDKILLER_OFFSET_Y
+    SPRITE_BEAM_OFFSET_Y
   );
 }
 
@@ -210,7 +167,10 @@ void renderMouse() {
   mouse.x = rabbitPosition.mousePosition[0];
   mouse.y = rabbitPosition.mousePosition[1];
   drawCompiledSprite(&mouse);
-  drawPixel(rabbitPosition.mouseDotPosition[0], rabbitPosition.mouseDotPosition[1], 2);
+
+  mouse.x = rabbitPosition.mouseDotPosition[0];
+  mouse.y = rabbitPosition.mouseDotPosition[1];
+  drawCompiledSprite(&mouse);
 }
 
 void renderRabbit() {
@@ -256,20 +216,22 @@ void renderEnemyBullets() {
 }
 
 void renderPowerup() {
+  struct CompiledSpriteRender *which;
+
   if (!playerPowerup.isActive) return;
 
   switch (playerPowerup.type) {
     case POWERUP_TYPE_SHOTGUN:
-      shotgun.x = playerPowerup.x;
+      which = &shotgun;
-      shotgun.y = playerPowerup.y;
-      drawCompiledSprite(&shotgun);
       break;
-    case POWERUP_TYPE_SHIELD_KILLER:
+    case POWERUP_TYPE_BEAM_WEAPON:
-      shieldKiller.x = playerPowerup.x;
+      which = &beam;
-      shieldKiller.y = playerPowerup.y;
-      drawCompiledSprite(&shieldKiller);
       break;
   }
+
+  which->x = playerPowerup.x;
+  which->y = playerPowerup.y;
+  drawCompiledSprite(which);
 }
 
 void drawOnlyArenaForSprite(struct CompiledSpriteRender *sprite) {
@@ -282,11 +244,9 @@ void drawOnlyMouseArena() {
   mouse.y = rabbitPosition.oldMousePosition[1];
   drawOnlyArenaForSprite(&mouse);
 
-  bounds.top = rabbitPosition.oldMouseDotPosition[1];
+  mouse.x = rabbitPosition.oldMouseDotPosition[0];
-  bounds.bottom = rabbitPosition.oldMouseDotPosition[1];
+  mouse.y = rabbitPosition.oldMouseDotPosition[1];
-  bounds.left = rabbitPosition.oldMouseDotPosition[0];
+  drawOnlyArenaForSprite(&mouse);
-  bounds.right = rabbitPosition.oldMouseDotPosition[0];
-  drawOnlyArena(&bounds);
 }
 
 void drawOnlyRabbitArena() {
@@ -296,21 +256,23 @@ void drawOnlyRabbitArena() {
 }
 
 void drawOnlyPowerupArena() {
+  struct CompiledSpriteRender *which;
+
   if (!playerPowerup.isActive) return;
 
   switch (playerPowerup.type) {
     case POWERUP_TYPE_SHOTGUN:
-      shotgun.x = playerPowerup.x;
+      which = &shotgun;
-      shotgun.y = playerPowerup.y;
-      drawOnlyArenaForSprite(&shotgun);
       break;
-    case POWERUP_TYPE_SHIELD_KILLER:
+    case POWERUP_TYPE_BEAM_WEAPON:
-      shieldKiller.x = playerPowerup.x;
+      which = &beam;
-      shieldKiller.y = playerPowerup.y;
-      drawOnlyArenaForSprite(&shieldKiller);
       break;
   }
 
+  which->x = playerPowerup.x;
+  which->y = playerPowerup.y;
+  drawOnlyArenaForSprite(which);
+
   if (playerPowerup.willBeInactive) {
     playerPowerup.isActive = 0;
   }
@@ -368,11 +330,8 @@ int setupGame() {
   installKeyboardHandler();
   initializeDrawBuffer();
 
-  fh = fopen("sprtsht.bmp", "rb");
+  buildDifficultyBands();
-  if (readBMPIntoNewMemory(fh, &spritesheetImage)) return 1;
+  buildHitPointRages();
-  fclose(fh);
-
-  spritesheetImage.transparentColor = 0;
 
   setupWallSprites();
   setupRabbitSprites();
@@ -384,8 +343,8 @@ int setupGame() {
   setupPowerupSprites();
 
   setVideoMode(VIDEO_MODE_VGA_256);
-  bmp256ColorPaletteToVGAColorPalette(&spritesheetImage, vgaColors);
+
-  setVGAColors(vgaColors, 256);
+  setVGAColors(palette, PALETTE_COLOR_COUNT);
 
   activateMouse(&mouseStatus);
 
@@ -411,8 +370,7 @@ void handleMovement() {
     &mouseStatus
   );
   calculateTargetAngle(
-    &rabbitPosition,
+    &rabbitPosition
-    &mouseStatus
   );
 }
 
@@ -425,12 +383,9 @@ void handleCombat() {
       &rabbitWeaponry,
       rabbitBulletPosition
     )) {
-      if (rabbitWeaponry.currentWeaponRemainingRounds > 0) {
+      fireCurrentWeaponOnce(
-        rabbitWeaponry.currentWeaponRemainingRounds--;
+        &rabbitWeaponry
-        if (rabbitWeaponry.currentWeaponRemainingRounds == 0) {
+      );
-          rabbitWeaponry.currentWeapon = WEAPON_TYPE_SINGLE_SHOT_GUN;
-        }
-      }
     }
   }
 
@@ -464,7 +419,7 @@ void handleCombat() {
   );
 
   if (didHitRabbit) {
-    health -= ENEMY_COLLISION_DAMAGE * didHitRabbit;
+    globalGameState.health -= ENEMY_COLLISION_DAMAGE * didHitRabbit;
   }
 
   didHitRabbit = handleEnemyBulletToRabbitCollisions(
@@ -473,18 +428,19 @@ void handleCombat() {
   );
 
   if (didHitRabbit) {
-    health -= ENEMY_BULLET_DAMAGE * didHitRabbit;
+    globalGameState.health -= ENEMY_BULLET_DAMAGE * didHitRabbit;
   }
 
   handleRabbitBulletToEnemyCollisions(
     rabbitBulletPosition,
-    enemyPosition
+    enemyPosition,
+    &rabbitWeaponry
   );
 
   if (handleRabbitToPowerupCollision(&rabbitPosition, &playerPowerup)) {
     playerPowerup.willBeInactive = 1;
-    rabbitWeaponry.currentWeapon = WEAPON_TYPE_SPREAD_SHOT_GUN;
+    rabbitWeaponry.currentWeapon = playerPowerup.type;
-    rabbitWeaponry.currentWeaponRemainingRounds = (globalGameState.difficulty + 1) * SHOTGUN_ROUNDS_PER_LEVEL;
+    rabbitWeaponry.currentWeaponRemainingRounds = determineWeaponRounds(globalGameState.difficulty);
   }
 }
 
@@ -513,6 +469,123 @@ double averageSpeedCalc;
 clock_t startTime;
 */
 
+struct PriorStats {
+  int kills;
+  int health;
+  int remainingRounds;
+  int coins;
+
+  int damageUpgradeAvailable;
+  int healthUpgradeAvailable;
+  int healthGainUpgradeAvailable;
+} priorStats = {
+  .kills = -1,
+  .health = -1,
+  .remainingRounds = -1,
+  .coins = -1,
+  .damageUpgradeAvailable = -1,
+  .healthUpgradeAvailable = -1,
+  .healthGainUpgradeAvailable = -1
+};
+
+struct UpgradesAvailable {
+  char damage;
+  char health;
+  char healthGain;
+} upgradesAvailable = {
+  .damage = 0,
+  .health = 0,
+  .healthGain = 0,
+};
+
+void calculateUpgradesAvailable() {
+  if (globalGameState.damageUpgradeLevel < 3) {
+    upgradesAvailable.damage = globalGameState.coins >= damageUpgradeCosts[globalGameState.damageUpgradeLevel];
+  } else {
+    upgradesAvailable.damage = 0;
+  }
+
+  if (globalGameState.healthUpgradeLevel < 3) {
+    upgradesAvailable.health = globalGameState.coins >= healthUpgradeCosts[globalGameState.healthUpgradeLevel];
+  } else {
+    upgradesAvailable.health = 0;
+  }
+
+  if (globalGameState.healthGainUpgradeLevel < 3) {
+    upgradesAvailable.healthGain = globalGameState.coins >= healthGainUpgradeCosts[globalGameState.healthGainUpgradeLevel];
+  } else {
+    upgradesAvailable.healthGain = 0;
+  }
+}
+
+void redrawGameStats() {
+  char buffer[20];
+
+  if (priorStats.kills != globalGameState.kills) {
+    sprintf(buffer, "Hit: %d", globalGameState.kills);
+    renderStringToDrawBuffer(buffer, 1, 0, 210, 20);
+
+    priorStats.kills = globalGameState.kills;
+  }
+
+  if (priorStats.health != globalGameState.health) {
+    sprintf(buffer, "Health: %d  ", globalGameState.health);
+    renderStringToDrawBuffer(buffer, 1, 0, 210, 30);
+
+    priorStats.health = globalGameState.health;
+  }
+
+  if (priorStats.remainingRounds != rabbitWeaponry.currentWeaponRemainingRounds) {
+    sprintf(buffer, "Rnds: %d  ", rabbitWeaponry.currentWeaponRemainingRounds);
+    renderStringToDrawBuffer(buffer, 1, 0, 210, 40);
+
+    priorStats.remainingRounds = rabbitWeaponry.currentWeaponRemainingRounds;
+  }
+
+  if (priorStats.coins != globalGameState.coins) {
+    sprintf(buffer, "Coins: %d  ", globalGameState.coins);
+    renderStringToDrawBuffer(buffer, 1, 0, 210, 50);
+
+    priorStats.coins = globalGameState.coins;
+  }
+
+  if (priorStats.damageUpgradeAvailable != upgradesAvailable.damage) {
+    if (upgradesAvailable.damage) {
+      sprintf(buffer, "[P] Dmg up");
+    } else {
+      sprintf(buffer, "          ");
+    }
+
+    renderStringToDrawBuffer(buffer, 1, 0, 210, 100);
+
+    priorStats.damageUpgradeAvailable = upgradesAvailable.damage;
+  }
+
+  if (priorStats.healthUpgradeAvailable != upgradesAvailable.health) {
+    if (upgradesAvailable.health) {
+      sprintf(buffer, "[O] Health up");
+    } else {
+      sprintf(buffer, "             ");
+    }
+
+    renderStringToDrawBuffer(buffer, 1, 0, 210, 110);
+
+    priorStats.healthUpgradeAvailable = upgradesAvailable.health;
+  }
+
+  if (priorStats.healthGainUpgradeAvailable != upgradesAvailable.healthGain) {
+    if (upgradesAvailable.healthGain) {
+      sprintf(buffer, "[I] HGain up");
+    } else {
+      sprintf(buffer, "            ");
+    }
+
+    renderStringToDrawBuffer(buffer, 1, 0, 210, 120);
+
+    priorStats.healthGainUpgradeAvailable = upgradesAvailable.healthGain;
+  }
+}
+
 int main(void) {
   byte *drawBuffer;
   int keepRunning = 1;
@@ -533,18 +606,37 @@ int main(void) {
       enemyPosition,
       &rabbitPosition
     );
-
-    handleMovement();
-    handleRedraw();
     handleCombat();
-    handleEnemyKills();
+    handleRedraw();
+    handleEnemyKills(
+      enemyPosition,
+      &globalGameState,
+      &playerPowerup,
+      &rabbitWeaponry
+    );
+    handleMovement();
 
-    sprintf(buffer, "Hit: %d", kills);
+    calculateUpgradesAvailable();
-    renderStringToDrawBuffer(buffer, 1, 0, 210, 20);
+    redrawGameStats();
-    sprintf(buffer, "Health: %d  ", health);
+
-    renderStringToDrawBuffer(buffer, 1, 0, 210, 30);
+    if (keyboardKeydownState.KEY_P && upgradesAvailable.damage) {
-    sprintf(buffer, "Rnds: %d  ", rabbitWeaponry.currentWeaponRemainingRounds);
+      globalGameState.coins -= damageUpgradeCosts[globalGameState.damageUpgradeLevel];
-    renderStringToDrawBuffer(buffer, 1, 0, 210, 40);
+      globalGameState.damageUpgradeLevel++;
+      rabbitWeaponry.damage++;
+    }
+
+    if (keyboardKeydownState.KEY_O && upgradesAvailable.health) {
+      globalGameState.coins -= healthUpgradeCosts[globalGameState.healthUpgradeLevel];
+      globalGameState.healthUpgradeLevel++;
+      globalGameState.maxHealth += HEALTH_UPGRADE_GAIN;
+      globalGameState.health = globalGameState.maxHealth;
+    }
+
+    if (keyboardKeydownState.KEY_I && upgradesAvailable.healthGain) {
+      globalGameState.coins -= healthGainUpgradeCosts[globalGameState.healthGainUpgradeLevel];
+      globalGameState.healthGainUpgradeLevel++;
+      globalGameState.healthGainPerKill++;
+    }
 
     waitStartVbl();
     copyDrawBufferToDisplay();

game.h

@@ -9,6 +9,15 @@ extern struct SpriteBounds bounds;
 struct GlobalGameState {
   int difficulty;
   int spawnCooldown;
+  int kills;
+  int health;
+  int maxHealth;
+  int healthGainPerKill;
+  int coins;
+
+  int damageUpgradeLevel;
+  int healthUpgradeLevel;
+  int healthGainUpgradeLevel;
 };
 
 #endif

in_progress.md

@@ -1,2 +0,0 @@
-* Preserve video mode
-* Rename files to 8.3

makefile

@@ -1,4 +1,5 @@
-obj = sprites.o game.o bmpload.o arena.o movement.o combat.o spawn.o
+obj = sprites.o game.o bmpload.o arena.o movement.o combat.o spawn.o const.o powerup.o
+test_obj = test.o spawn.o spawn_test.o powerup.o powerup_test.o const.o const_test.o combat.o combat_test.o movement.o movement_test.o
 
 all: system/system.lib game.exe test .SYMBOLIC
 
@@ -19,10 +20,14 @@ sprites.asm: sprtsht.bmp spritesheet.yml
 game.exe: $(obj) system/system.lib
   wcl386 -q -fe=game -bt=dos -l=dos4g $(obj) system/system.lib
 
-test: test.c spawn_test.c spawn.c .SYMBOLIC
+test: $(test_obj) system/system.lib .SYMBOLIC
-	wcl386 -fe=test -bt=dos -l=dos4g test.c spawn.c spawn_test.c cutest-1.5/CuTest.c
+	wcl386 -fe=test -bt=dos -l=dos4g $(test_obj) cutest-1.5/CuTest.c system/system.lib
 
 clean: .SYMBOLIC
+	rm -f game.exe
+	rm -f test.exe
 	rm *.o
+	rm *.err
 	rm system/*.o
 	rm system/*.lib
+	rm system/*.err

movement.c

@@ -1,4 +1,5 @@
 #include <math.h>
+#include <stdio.h>
 #include <stdlib.h>
 
 #include "game.h"
@@ -8,6 +9,9 @@
 
 #include "system/mouse_io.h"
 #include "system/pc_stuff.h"
+#include "system/vga.h"
+
+#define SIGN(x) ((x > 0) - (x < 0))
 
 void captureAndLimitMousePosition(
   struct RabbitPosition *pos,
@@ -25,33 +29,131 @@ void captureAndLimitMousePosition(
   if (pos->mouseDotPosition[1] >= MOUSE_LIMIT_BOTTOM) pos->mouseDotPosition[1] = MOUSE_LIMIT_BOTTOM;
 }
 
-void calculateTargetAngle(
+// now this is ray casting
+struct TargetMousePosition {
+  int x, y;
+};
+
+void constrainMousePosition(
   struct RabbitPosition *pos,
-  struct MouseStatus *mouseStatus
+  struct TargetMousePosition *target
+) {
+  int i, didChange, which;
+  int currentX, currentY;
+
+  float xCrossover, yCrossover;
+  float maxDeltaX, maxDeltaY, fixHypotenuse, fixDistance;
+  float currentDeltaX, currentDeltaY;
+  float adjustedDeltaX, adjustedDeltaY;
+  int considerX, considerY;
+
+  maxDeltaX = sin(pos->mouseAngle * DEG2RAD) * MOUSE_DISTANCE;
+  maxDeltaY = -cos(pos->mouseAngle * DEG2RAD) * MOUSE_DISTANCE;
+
+  currentX = target->x + maxDeltaX;
+  currentY = target->y + maxDeltaY;
+
+  if (maxDeltaX > 0) {
+    currentDeltaX = ARENA_RIGHT_EDGE - target->x;
+  } else {
+    currentDeltaX = target->x - ARENA_LEFT_EDGE;
+  }
+
+  if (maxDeltaY > 0) {
+    currentDeltaY = ARENA_BOTTOM_EDGE - target->y;
+  } else {
+    currentDeltaY = target->y - ARENA_TOP_EDGE;
+  }
+
+  which = -1;
+
+  considerY = currentY > ARENA_BOTTOM_EDGE || currentY < ARENA_TOP_EDGE;
+  considerX = currentX > ARENA_RIGHT_EDGE || currentX < ARENA_LEFT_EDGE;
+
+  if (considerX || considerY) {
+    if (considerX && considerY) {
+      which = currentDeltaY < currentDeltaX;
+    } else {
+      which = considerY;
+    }
+  }
+
+  switch (which) {
+    case 0: // x
+      if (maxDeltaX > 0) {
+        adjustedDeltaX = ARENA_RIGHT_EDGE - target->x;
+      } else {
+        adjustedDeltaX = -(target->x - ARENA_LEFT_EDGE);
+      }
+
+      adjustedDeltaY = (adjustedDeltaX / sin(pos->mouseAngle * DEG2RAD)) * -cos(pos->mouseAngle * DEG2RAD);
+      if (fabs(adjustedDeltaY) > currentDeltaY) {
+        adjustedDeltaY = SIGN(adjustedDeltaY) * currentDeltaY;
+      }
+
+      break;
+    case 1: // y
+      if (maxDeltaY > 0) {
+        adjustedDeltaY = ARENA_BOTTOM_EDGE - target->y;
+      } else {
+        adjustedDeltaY = -(target->y - ARENA_TOP_EDGE);
+      }
+
+      adjustedDeltaX = (adjustedDeltaY / -cos(pos->mouseAngle * DEG2RAD)) * sin(pos->mouseAngle * DEG2RAD);
+      if (fabs(adjustedDeltaX) > currentDeltaX) {
+        adjustedDeltaX = SIGN(adjustedDeltaX) * currentDeltaX;
+      }
+
+      break;
+  }
+
+  if (which != -1) {
+    currentX = target->x + adjustedDeltaX;
+    currentY = target->y + adjustedDeltaY;
+  }
+
+  target->x = currentX;
+  target->y = currentY;
+}
+
+void calculateTargetAngle(
+  struct RabbitPosition *pos
 ) {
   float distanceX, distanceY;
-  float angle;
+  float angle, fixHypotenuse, fixDistance;
+  struct TargetMousePosition targetMousePosition;
 
   // Position the cursor
   distanceX = pos->mouseDotPosition[0] - pos->rabbitPosition[0];
   distanceY = pos->mouseDotPosition[1] - pos->rabbitPosition[1];
 
+  // edge case -- top left corner
+  if (
+    pos->rabbitPosition[0] == ARENA_LEFT_EDGE &&
+    pos->rabbitPosition[1] == ARENA_TOP_EDGE &&
+    distanceX == 0 &&
+    distanceY == 0
+  ) {
+    angle = 315;
+  } else {
     angle = atan2(distanceY, distanceX) * RAD2DEG + 90;
     if (angle < 0) angle += 360;
+  }
 
-  distanceX = sin(angle * DEG2RAD) * MOUSE_DISTANCE;
+  pos->mouseAngle = angle;
-  distanceY = -cos(angle * DEG2RAD) * MOUSE_DISTANCE;
 
   pos->oldMousePosition[0] = pos->mousePosition[0];
   pos->oldMousePosition[1] = pos->mousePosition[1];
 
-  pos->mousePosition[0] = pos->rabbitPosition[0] + distanceX;
+  targetMousePosition.x = pos->rabbitPosition[0];
-  pos->mousePosition[1] = pos->rabbitPosition[1] + distanceY;
+  targetMousePosition.y = pos->rabbitPosition[1];
 
-  pos->mouseAngle = angle;
+  constrainMousePosition(pos, &targetMousePosition);
+
+  pos->mousePosition[0] = targetMousePosition.x;
+  pos->mousePosition[1] = targetMousePosition.y;
 }
 
-#define SIGN(x) ((x > 0) - (x < 0))
 
 void handleEnemyMovement(
   struct EnemyPosition enemyPosition[],

movement.h

@@ -18,18 +18,13 @@ struct RabbitPosition {
   int mouseAngle;
 };
 
-#define WEAPON_TYPE_SINGLE_SHOT_GUN (0)
-#define WEAPON_TYPE_SPREAD_SHOT_GUN (1)
-
 struct RabbitWeaponry {
   char cooldown;
   char currentWeapon;
   int currentWeaponRemainingRounds;
+  char damage;
 };
 
-#define POWERUP_TYPE_SHOTGUN (0)
-#define POWERUP_TYPE_SHIELD_KILLER (1)
-
 struct PlayerPowerup {
   int x, y;
   int cooldown;
@@ -54,23 +49,23 @@ struct BulletPosition {
 };
 
 struct EnemyPosition {
-  char isActive;
+  int hitPoints;
-
-  char willBeInactive;
-  char wasKilled;
-
-  char hitPoints;
-  char hasLeftGate;
-  char gateExitedFrom;
-
   int enemyPosition[2];
   int oldEnemyPosition[2];
 
   int enemyMoveDelayStep;
   int enemyFireDelayStep;
+
+  char isActive;
+
+  char willBeInactive;
+  char wasKilled;
+
+  char hasLeftGate;
+  char gateExitedFrom;
 };
 
-void calculateTargetAngle(struct RabbitPosition*, struct MouseStatus*);
+void calculateTargetAngle(struct RabbitPosition*);
 void captureAndLimitMousePosition(struct RabbitPosition*, struct MouseStatus*);
 void handleRabbitMovement(struct RabbitPosition*, struct KeyboardKeydownState*);
 void handleEnemyMovement(struct EnemyPosition[], struct RabbitPosition*);

movement_test.c

@@ -0,0 +1,30 @@
+#include "cutest-1.5/CuTest.h"
+#include "movement.h"
+
+#include "const.h"
+
+void TestCalculateTargetAngle_AgainstTopRight(CuTest *tc) {
+  struct RabbitPosition rabbitPosition;
+
+  // mouse against very edge
+  rabbitPosition.mouseDotPosition[0] = 199;
+  rabbitPosition.mouseDotPosition[1] = 0;
+
+  // rabbit against wall
+  rabbitPosition.rabbitPosition[0] = 177;
+  rabbitPosition.rabbitPosition[1] = 25;
+
+  calculateTargetAngle(&rabbitPosition);
+
+  // mouse should not extend (tile width - mouse width) past player
+
+  CuAssertIntEquals(tc, 180, rabbitPosition.mousePosition[0]);
+  CuAssertIntEquals(tc, 21, rabbitPosition.mousePosition[1]);
+  CuAssertIntEquals(tc, 41, rabbitPosition.mouseAngle);
+}
+
+CuSuite *MovementGetSuite() {
+  CuSuite *suite = CuSuiteNew();
+  SUITE_ADD_TEST(suite, TestCalculateTargetAngle_AgainstTopRight);
+  return suite;
+}

powerup.c

@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "game.h"
+#include "movement.h"
+#include "powerup.h"
+#include "const.h"
+
+// powerup should spawn every other difficulty band
+// so the first spawn should happen somewhere 10 + (20 * rand())
+int determinePowerupCooldownTime(int difficulty) {
+  if (difficulty > MAX_DIFFICULTY) exit(1);
+
+  return difficulty * 10 + rand() % 20;
+}
+
+// if every shot lands, you should run out slightly before the next powerup
+// should be available
+// so for the first rounds should be difficulty(1) + difficulty(2) % rand() or so
+int determineWeaponRounds(int difficulty) {
+  if (difficulty > MAX_DIFFICULTY) exit(1);
+
+  return difficultyBands[difficulty] / 2 +
+    rand() % (difficultyBands[difficulty] / 8);
+}
+
+void processPowerupCooldown(
+  struct PlayerPowerup *playerPowerup,
+  struct GlobalGameState *globalGameState,
+  struct RabbitWeaponry *rabbitWeaponry,
+  int killCount
+) {
+  if (playerPowerup->isActive) return;
+  //if (rabbitWeaponry->currentWeapon != WEAPON_TYPE_SINGLE_SHOT_GUN) return;
+
+  playerPowerup->cooldown -= killCount;
+  if (playerPowerup->cooldown <= 0) {
+    playerPowerup->x = TILE_SIZE + rand() % ((ARENA_WIDTH_TILES - 2) * TILE_SIZE);
+    playerPowerup->y = TILE_SIZE + rand() % ((ARENA_HEIGHT_TILES - 2) * TILE_SIZE);
+    playerPowerup->isActive = 1;
+    playerPowerup->willBeInactive = 0;
+    playerPowerup->type = rand() % 2 + 1;
+
+    playerPowerup->cooldown = determinePowerupCooldownTime(globalGameState->difficulty);
+  }
+}
+

powerup.h

@@ -0,0 +1,16 @@
+#ifndef __POWERUP_H__
+#define __POWERUP_H__
+
+#include "game.h"
+#include "movement.h"
+
+int determinePowerupCooldownTime(int difficulty);
+int determineWeaponRounds(int difficulty);
+void processPowerupCooldown(
+  struct PlayerPowerup*,
+  struct GlobalGameState*,
+  struct RabbitWeaponry*,
+  int killCount
+);
+
+#endif

powerup_test.c

@@ -0,0 +1,125 @@
+#include "cutest-1.5/CuTest.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "game.h"
+#include "movement.h"
+#include "powerup.h"
+#include "const.h"
+
+void TestDeterminePowerupCooldownTime(CuTest *tc) {
+  srand(1);
+
+  CuAssertIntEquals(tc, 18, determinePowerupCooldownTime(0));
+  CuAssertIntEquals(tc, 28, determinePowerupCooldownTime(1));
+  CuAssertIntEquals(tc, 33, determinePowerupCooldownTime(2));
+}
+
+void TestDetermineWeaponRounds(CuTest *tc) {
+  srand(1);
+
+  CuAssertIntEquals(tc, 10, determineWeaponRounds(0));
+  CuAssertIntEquals(tc, 23, determineWeaponRounds(1));
+  CuAssertIntEquals(tc, 36, determineWeaponRounds(2));
+}
+
+
+
+void TestProcessPowerupCooldown_PowerupActive(CuTest *tc) {
+  struct PlayerPowerup playerPowerup;
+  struct GlobalGameState globalGameState;
+  struct RabbitWeaponry rabbitWeaponry;
+
+  playerPowerup.isActive = 1;
+  playerPowerup.cooldown = 100;
+
+  processPowerupCooldown(
+    &playerPowerup,
+    &globalGameState,
+    &rabbitWeaponry,
+    10
+  );
+
+  CuAssertIntEquals(tc, 100, playerPowerup.cooldown);
+  CuAssertIntEquals(tc, 1, playerPowerup.isActive);
+}
+
+void TestProcessPowerupCooldown_WeaponActive(CuTest *tc) {
+  struct PlayerPowerup playerPowerup;
+  struct GlobalGameState globalGameState;
+  struct RabbitWeaponry rabbitWeaponry;
+
+  playerPowerup.isActive = 0;
+  playerPowerup.cooldown = 100;
+  rabbitWeaponry.currentWeapon = 99;
+
+  processPowerupCooldown(
+    &playerPowerup,
+    &globalGameState,
+    &rabbitWeaponry,
+    10
+  );
+
+  CuAssertIntEquals(tc, 90, playerPowerup.cooldown);
+  CuAssertIntEquals(tc, 0, playerPowerup.isActive);
+}
+
+void TestProcessPowerupCooldown_NotTriggered(CuTest *tc) {
+  struct PlayerPowerup playerPowerup;
+  struct GlobalGameState globalGameState;
+  struct RabbitWeaponry rabbitWeaponry;
+
+  playerPowerup.isActive = 0;
+  playerPowerup.cooldown = 100;
+  rabbitWeaponry.currentWeapon = WEAPON_TYPE_SINGLE_SHOT_GUN;
+
+  processPowerupCooldown(
+    &playerPowerup,
+    &globalGameState,
+    &rabbitWeaponry,
+    10
+  );
+
+  CuAssertIntEquals(tc, 90, playerPowerup.cooldown);
+  CuAssertIntEquals(tc, 0, playerPowerup.isActive);
+}
+
+void TestProcessPowerupCooldown_Triggered(CuTest *tc) {
+  struct PlayerPowerup playerPowerup;
+  struct GlobalGameState globalGameState;
+  struct RabbitWeaponry rabbitWeaponry;
+
+  srand(1);
+
+  playerPowerup.isActive = 0;
+  playerPowerup.cooldown = 100;
+  rabbitWeaponry.currentWeapon = WEAPON_TYPE_SINGLE_SHOT_GUN;
+  playerPowerup.willBeInactive = 1;
+  globalGameState.difficulty = 0;
+
+  processPowerupCooldown(
+    &playerPowerup,
+    &globalGameState,
+    &rabbitWeaponry,
+    101
+  );
+
+  CuAssertIntEquals(tc, 1, playerPowerup.isActive);
+  CuAssertIntEquals(tc, 0, playerPowerup.willBeInactive);
+
+  // rand
+  CuAssertIntEquals(tc, 15, playerPowerup.cooldown);
+  CuAssertIntEquals(tc, 58, playerPowerup.x);
+  CuAssertIntEquals(tc, 178, playerPowerup.y);
+}
+
+CuSuite *PowerupGetSuite() {
+  CuSuite *suite = CuSuiteNew();
+  SUITE_ADD_TEST(suite, TestDeterminePowerupCooldownTime);
+  SUITE_ADD_TEST(suite, TestDetermineWeaponRounds);
+  SUITE_ADD_TEST(suite, TestProcessPowerupCooldown_PowerupActive);
+  SUITE_ADD_TEST(suite, TestProcessPowerupCooldown_WeaponActive);
+  SUITE_ADD_TEST(suite, TestProcessPowerupCooldown_NotTriggered);
+  SUITE_ADD_TEST(suite, TestProcessPowerupCooldown_Triggered);
+  return suite;
+}

spawn.c

@@ -17,21 +17,8 @@ struct SpawnPointRange spawnPointRanges[4] = {
    { .left = TILE_SIZE - 8, .width = TILE_SIZE, .top = TILE_SIZE * 4, .height = TILE_SIZE * 2 },
 };
 
-int HIT_POINT_RANGES[10][4] = {
-  { 1, 1, 1, 1 },
-  { 1, 1, 1, 1 },
-  { 1, 1, 1, 2 },
-  { 1, 1, 1, 2 },
-  { 1, 1, 2, 2 },
-  { 1, 2, 2, 2 },
-  { 1, 2, 2, 2 },
-  { 1, 2, 2, 3 },
-  { 1, 2, 2, 3 },
-  { 1, 2, 3, 3 }
-};
-
 int determineEnemyHitPointCalculation(int difficulty, int roll) {
-  return HIT_POINT_RANGES[difficulty][roll];
+  return hitPointRanges[difficulty][roll];
 }
 
 void selectEnemySpawnLocation(

spawn_test.c

@@ -39,17 +39,6 @@ void TestSelectEnemySpawnLocation(CuTest *tc) {
   CuAssertIntEquals(tc, 91, spawnDetails.spawnY);
 }
 
-void TestDetermineEnemyHitPointCalculation(CuTest *tc) {
-  srand(1);
-
-  CuAssertIntEquals(tc, 1, determineEnemyHitPointCalculation(0, 0));
-  CuAssertIntEquals(tc, 1, determineEnemyHitPointCalculation(0, 3));
-
-  CuAssertIntEquals(tc, 1, determineEnemyHitPointCalculation(2, 0));
-  CuAssertIntEquals(tc, 1, determineEnemyHitPointCalculation(2, 2));
-  CuAssertIntEquals(tc, 2, determineEnemyHitPointCalculation(2, 3));
-}
-
 void TestSpawnEnemy(CuTest *tc) {
   srand(1);
 
@@ -62,8 +51,8 @@ void TestSpawnEnemy(CuTest *tc) {
   spawnEnemy(&spawnDetails, &globalGameState);
 
   // randomized values
-  CuAssertIntEquals(tc, 2, enemyPosition.hitPoints);
+  CuAssertIntEquals(tc, 1, enemyPosition.hitPoints);
-  CuAssertIntEquals(tc, 103, enemyPosition.enemyFireDelayStep);
+  CuAssertIntEquals(tc, 108, enemyPosition.enemyFireDelayStep);
 
   // from spawndetails
   CuAssertIntEquals(tc, 1, enemyPosition.gateExitedFrom);
@@ -76,7 +65,6 @@ void TestSpawnEnemy(CuTest *tc) {
 CuSuite *SpawnGetSuite() {
   CuSuite *suite = CuSuiteNew();
   SUITE_ADD_TEST(suite, TestSelectEnemySpawnLocation);
-  SUITE_ADD_TEST(suite, TestDetermineEnemyHitPointCalculation);
   SUITE_ADD_TEST(suite, TestSpawnEnemy);
   return suite;
 }

sprites.asm

@@ -7,11 +7,66 @@ PUBLIC sprite_mouse_
 PUBLIC sprite_bullet_
 PUBLIC sprite_enemy_
 PUBLIC sprite_shotgun_
-PUBLIC sprite_shieldKiller_
+PUBLIC sprite_beam_
+PUBLIC _palette
 
 .386
 .model flat,c
 
+.DATA
+_palette:
+  BYTE 63
+  BYTE 0
+  BYTE 63
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 15
+  BYTE 16
+  BYTE 49
+  BYTE 16
+  BYTE 16
+  BYTE 33
+  BYTE 16
+  BYTE 16
+  BYTE 16
+  BYTE 63
+  BYTE 63
+  BYTE 63
+  BYTE 38
+  BYTE 31
+  BYTE 12
+  BYTE 63
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+  BYTE 0
+
 .CODE
 
 
@@ -1336,10 +1391,10 @@ sprite_bullet_:
   mov ebp, esp
 
   
+  mov BYTE PTR [eax + -321], 5
+  mov BYTE PTR [eax + -320], 5
+  mov BYTE PTR [eax + -1], 5
   mov BYTE PTR [eax + 0], 5
-  mov BYTE PTR [eax + 1], 5
-  mov BYTE PTR [eax + 320], 5
-  mov BYTE PTR [eax + 321], 5
 
   pop ebp
   ret
@@ -1559,11 +1614,155 @@ sprite_shotgun_:
   ret
 
 
-sprite_shieldKiller_:
+sprite_beam_:
   push ebp
   mov ebp, esp
 
   
+  mov BYTE PTR [eax + -1926], 7
+  mov BYTE PTR [eax + -1925], 7
+  mov BYTE PTR [eax + -1924], 7
+  mov BYTE PTR [eax + -1923], 7
+  mov BYTE PTR [eax + -1922], 7
+  mov BYTE PTR [eax + -1921], 7
+  mov BYTE PTR [eax + -1920], 7
+  mov BYTE PTR [eax + -1919], 7
+  mov BYTE PTR [eax + -1918], 7
+  mov BYTE PTR [eax + -1917], 7
+  mov BYTE PTR [eax + -1916], 7
+  mov BYTE PTR [eax + -1915], 7
+  mov BYTE PTR [eax + -1606], 7
+  mov BYTE PTR [eax + -1605], 7
+  mov BYTE PTR [eax + -1604], 7
+  mov BYTE PTR [eax + -1603], 7
+  mov BYTE PTR [eax + -1602], 7
+  mov BYTE PTR [eax + -1601], 7
+  mov BYTE PTR [eax + -1600], 7
+  mov BYTE PTR [eax + -1599], 7
+  mov BYTE PTR [eax + -1598], 7
+  mov BYTE PTR [eax + -1597], 7
+  mov BYTE PTR [eax + -1596], 7
+  mov BYTE PTR [eax + -1595], 7
+  mov BYTE PTR [eax + -1286], 7
+  mov BYTE PTR [eax + -1285], 7
+  mov BYTE PTR [eax + -1284], 7
+  mov BYTE PTR [eax + -1283], 7
+  mov BYTE PTR [eax + -1282], 7
+  mov BYTE PTR [eax + -1281], 7
+  mov BYTE PTR [eax + -1280], 7
+  mov BYTE PTR [eax + -1279], 7
+  mov BYTE PTR [eax + -1278], 7
+  mov BYTE PTR [eax + -1277], 7
+  mov BYTE PTR [eax + -1276], 7
+  mov BYTE PTR [eax + -1275], 7
+  mov BYTE PTR [eax + -966], 7
+  mov BYTE PTR [eax + -965], 7
+  mov BYTE PTR [eax + -964], 7
+  mov BYTE PTR [eax + -963], 7
+  mov BYTE PTR [eax + -962], 7
+  mov BYTE PTR [eax + -961], 7
+  mov BYTE PTR [eax + -960], 7
+  mov BYTE PTR [eax + -959], 7
+  mov BYTE PTR [eax + -958], 7
+  mov BYTE PTR [eax + -957], 7
+  mov BYTE PTR [eax + -956], 7
+  mov BYTE PTR [eax + -955], 7
+  mov BYTE PTR [eax + -646], 7
+  mov BYTE PTR [eax + -645], 7
+  mov BYTE PTR [eax + -644], 7
+  mov BYTE PTR [eax + -643], 7
+  mov BYTE PTR [eax + -642], 7
+  mov BYTE PTR [eax + -641], 7
+  mov BYTE PTR [eax + -640], 7
+  mov BYTE PTR [eax + -639], 7
+  mov BYTE PTR [eax + -638], 7
+  mov BYTE PTR [eax + -637], 7
+  mov BYTE PTR [eax + -636], 7
+  mov BYTE PTR [eax + -635], 7
+  mov BYTE PTR [eax + -326], 7
+  mov BYTE PTR [eax + -325], 7
+  mov BYTE PTR [eax + -324], 7
+  mov BYTE PTR [eax + -323], 7
+  mov BYTE PTR [eax + -322], 7
+  mov BYTE PTR [eax + -321], 7
+  mov BYTE PTR [eax + -320], 7
+  mov BYTE PTR [eax + -319], 7
+  mov BYTE PTR [eax + -318], 7
+  mov BYTE PTR [eax + -317], 7
+  mov BYTE PTR [eax + -316], 7
+  mov BYTE PTR [eax + -315], 7
+  mov BYTE PTR [eax + -6], 7
+  mov BYTE PTR [eax + -5], 7
+  mov BYTE PTR [eax + -4], 7
+  mov BYTE PTR [eax + -3], 7
+  mov BYTE PTR [eax + -2], 7
+  mov BYTE PTR [eax + -1], 7
+  mov BYTE PTR [eax + 0], 7
+  mov BYTE PTR [eax + 1], 7
+  mov BYTE PTR [eax + 2], 7
+  mov BYTE PTR [eax + 3], 7
+  mov BYTE PTR [eax + 4], 7
+  mov BYTE PTR [eax + 5], 7
+  mov BYTE PTR [eax + 314], 7
+  mov BYTE PTR [eax + 315], 7
+  mov BYTE PTR [eax + 316], 7
+  mov BYTE PTR [eax + 317], 7
+  mov BYTE PTR [eax + 318], 7
+  mov BYTE PTR [eax + 319], 7
+  mov BYTE PTR [eax + 320], 7
+  mov BYTE PTR [eax + 321], 7
+  mov BYTE PTR [eax + 322], 7
+  mov BYTE PTR [eax + 323], 7
+  mov BYTE PTR [eax + 324], 7
+  mov BYTE PTR [eax + 325], 7
+  mov BYTE PTR [eax + 634], 7
+  mov BYTE PTR [eax + 635], 7
+  mov BYTE PTR [eax + 636], 7
+  mov BYTE PTR [eax + 637], 7
+  mov BYTE PTR [eax + 638], 7
+  mov BYTE PTR [eax + 639], 7
+  mov BYTE PTR [eax + 640], 7
+  mov BYTE PTR [eax + 641], 7
+  mov BYTE PTR [eax + 642], 7
+  mov BYTE PTR [eax + 643], 7
+  mov BYTE PTR [eax + 644], 7
+  mov BYTE PTR [eax + 645], 7
+  mov BYTE PTR [eax + 954], 7
+  mov BYTE PTR [eax + 955], 7
+  mov BYTE PTR [eax + 956], 7
+  mov BYTE PTR [eax + 957], 7
+  mov BYTE PTR [eax + 958], 7
+  mov BYTE PTR [eax + 959], 7
+  mov BYTE PTR [eax + 960], 7
+  mov BYTE PTR [eax + 961], 7
+  mov BYTE PTR [eax + 962], 7
+  mov BYTE PTR [eax + 963], 7
+  mov BYTE PTR [eax + 964], 7
+  mov BYTE PTR [eax + 965], 7
+  mov BYTE PTR [eax + 1274], 7
+  mov BYTE PTR [eax + 1275], 7
+  mov BYTE PTR [eax + 1276], 7
+  mov BYTE PTR [eax + 1277], 7
+  mov BYTE PTR [eax + 1278], 7
+  mov BYTE PTR [eax + 1279], 7
+  mov BYTE PTR [eax + 1280], 7
+  mov BYTE PTR [eax + 1281], 7
+  mov BYTE PTR [eax + 1282], 7
+  mov BYTE PTR [eax + 1283], 7
+  mov BYTE PTR [eax + 1284], 7
+  mov BYTE PTR [eax + 1285], 7
+  mov BYTE PTR [eax + 1594], 7
+  mov BYTE PTR [eax + 1595], 7
+  mov BYTE PTR [eax + 1596], 7
+  mov BYTE PTR [eax + 1597], 7
+  mov BYTE PTR [eax + 1598], 7
+  mov BYTE PTR [eax + 1599], 7
+  mov BYTE PTR [eax + 1600], 7
+  mov BYTE PTR [eax + 1601], 7
+  mov BYTE PTR [eax + 1602], 7
+  mov BYTE PTR [eax + 1603], 7
+  mov BYTE PTR [eax + 1604], 7
+  mov BYTE PTR [eax + 1605], 7
 
   pop ebp
   ret

sprites.h

@@ -2,6 +2,11 @@
 #define __SPRITES_H__
 
 #include "types.h"
+#include "system/vga.h"
+
+#define PALETTE_COLOR_COUNT (17)
+
+extern struct VGAColor palette[17];
 
 
 extern void sprite_arenaWallTop(byte *);
@@ -61,9 +66,9 @@ extern void sprite_mouse(byte *);
 
 extern void sprite_bullet(byte *);
 
-#define SPRITE_BULLET_WIDTH (4)
+#define SPRITE_BULLET_WIDTH (2)
 
-#define SPRITE_BULLET_HEIGHT (4)
+#define SPRITE_BULLET_HEIGHT (2)
 
 #define SPRITE_BULLET_OFFSET_X (1)
 
@@ -92,15 +97,15 @@ extern void sprite_shotgun(byte *);
 #define SPRITE_SHOTGUN_OFFSET_Y (6)
 
 
-extern void sprite_shieldKiller(byte *);
+extern void sprite_beam(byte *);
 
-#define SPRITE_SHIELDKILLER_WIDTH (12)
+#define SPRITE_BEAM_WIDTH (12)
 
-#define SPRITE_SHIELDKILLER_HEIGHT (12)
+#define SPRITE_BEAM_HEIGHT (12)
 
-#define SPRITE_SHIELDKILLER_OFFSET_X (6)
+#define SPRITE_BEAM_OFFSET_X (6)
 
-#define SPRITE_SHIELDKILLER_OFFSET_Y (6)
+#define SPRITE_BEAM_OFFSET_Y (6)
 
 
 

spritesheet.yml

@@ -26,8 +26,8 @@ files:
         dimensions: [8, 8]
         offset: [4, 4]
       bullet:
-        position: [16, 28]
+        position: [17, 29]
-        dimensions: [4, 4]
+        dimensions: [2, 2]
         offset: [1, 1]
       enemy:
         position: [0, 20]
@@ -37,7 +37,7 @@ files:
         position: [32, 20]
         dimensions: [12, 12]
         offset: [6, 6]
-      shieldKiller:
+      beam:
         position: [44, 20]
         dimensions: [12, 12]
         offset: [6, 6]

system/keyboard.c

@@ -13,6 +13,9 @@ void populateKeyboardKeydownState() {
   keyboardKeydownState.KEY_A = keystateBits[3] & 0x40;
   keyboardKeydownState.KEY_S = keystateBits[3] & 0x80;
   keyboardKeydownState.KEY_D = keystateBits[4] & 0x01;
+  keyboardKeydownState.KEY_I = keystateBits[2] & 0x80;
+  keyboardKeydownState.KEY_O = keystateBits[3] & 0x01;
+  keyboardKeydownState.KEY_P = keystateBits[3] & 0x02;
   keyboardKeydownState.KEY_ESC = keystateBits[0] & 0x02;
 }
 

system/keyboard.h

@@ -10,6 +10,9 @@ struct KeyboardKeydownState {
   byte KEY_A;
   byte KEY_S;
   byte KEY_D;
+  byte KEY_I;
+  byte KEY_O;
+  byte KEY_P;
   byte KEY_ESC;
 };
 

system/vga.c

@@ -2,6 +2,7 @@
 #include "pc_stuff.h"
 #include <malloc.h>
 #include <conio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 #include <time.h>
@@ -128,26 +129,68 @@ void setVGAColors(struct VGAColor colors[], int totalColors) {
 
 #define RENDER_STRING_FAILSAFE (80)
 
+struct CharRowDetails {
+  char c;
+  char color;
+  char backgroundColor;
+  char writeBackgroundColor;
+  char* pos;
+} charRowDetails;
+
+// Write this in inline assembler for practice!
+void plotCharRow();
+#pragma aux plotCharRow = \
+"mov al, [edi]" \
+"mov ah, 8" \
+"mov bl, [edi+1]" \
+"mov bh, [edi+2]" \
+"mov cl, [edi+3]" \
+"mov edi, [edi + 4]" \
+"nextBit: mov ch, al" \
+"and ch,1" \
+"cmp ch,1" \
+"jne background" \
+"mov [edi], bl" \
+"jmp maybeKeepGoing" \
+"background: cmp cl,0" \
+"je maybeKeepGoing" \
+"mov [edi], bh" \
+"maybeKeepGoing: ror al, 1" \
+"inc edi" \
+"dec ah" \
+"jnz nextBit" \
+parm [edi] \
+modify [eax ebx ecx edi];
+
 void renderStringToDrawBuffer(char* buffer, int color, int backgroundColor, int x, int y) {
   char *bufferPos = buffer, currentCharacter, charRow;
   int i, fontX, fontY, currentX = x;
 
+  int charX, fontYs[8];
+
+  charRowDetails.color = color;
+  if (backgroundColor == -1) {
+    charRowDetails.backgroundColor = 0;
+  }
+  charRowDetails.writeBackgroundColor = backgroundColor != -1;
+
+  for (fontY = 0; fontY < 8; ++fontY) {
+    fontYs[fontY] = (y + fontY) * VGA_DISPLAY_WIDTH;
+  }
+
+  charX = x;
+
   for (i = 0; i < RENDER_STRING_FAILSAFE; ++i) {
     currentCharacter = *(bufferPos++);
     if (!currentCharacter) break;
 
     for (fontY = 0; fontY < 8; ++fontY) {
-      charRow = font8x8_basic[currentCharacter][fontY];
+      charRowDetails.c = font8x8_basic[currentCharacter][fontY];
+      charRowDetails.pos = drawBuffer + fontYs[fontY] + charX;
 
-      for (fontX = 0; fontX < 8; ++fontX) {
+      plotCharRow(&charRowDetails);
-        if (charRow & (1 << fontX)) {
-          drawBuffer[(y + fontY) * VGA_DISPLAY_WIDTH + (i * 8 + x + fontX)] = color;
-        } else {
-          if (backgroundColor > -1) {
-            drawBuffer[(y + fontY) * VGA_DISPLAY_WIDTH + (i * 8 + x + fontX)] = backgroundColor;
-          }
-        }
-      }
     }
+
+    charX += 8;
   }
 }

test.c

@@ -1,20 +1,38 @@
+#include "const.h"
 #include "cutest-1.5/CuTest.h"
 #include <stdio.h>
 
 CuSuite *SpawnGetSuite();
+CuSuite *PowerupGetSuite();
+CuSuite *CombatGetSuite();
+CuSuite *ConstGetSuite();
+CuSuite *MovementGetSuite();
 
-void RunAllTests(void) {
+void beforeAll() {
+  buildDifficultyBands();
+  buildHitPointRages();
+}
+
+int RunAllTests(void) {
   CuString *output = CuStringNew();
   CuSuite *suite = CuSuiteNew();
 
+  beforeAll();
+
   CuSuiteAddSuite(suite, SpawnGetSuite());
+  CuSuiteAddSuite(suite, PowerupGetSuite());
+  CuSuiteAddSuite(suite, CombatGetSuite());
+  CuSuiteAddSuite(suite, ConstGetSuite());
+  CuSuiteAddSuite(suite, MovementGetSuite());
 
   CuSuiteRun(suite);
   CuSuiteSummary(suite, output);
   CuSuiteDetails(suite, output);
   printf("%s\n", output->buffer);
+
+  return suite->failCount > 0;
 }
 
 int main(void) {
-  RunAllTests();
+  return RunAllTests();
 }