character can move around

.gitignore

@@ -4,3 +4,5 @@
 *.EXE
 .ccls-cache/
 *.LNK
+*.o
+*.exe

bmpload.h

@@ -25,5 +25,6 @@ struct BMPImage {
 int readBMPIntoMemory(FILE *, struct BMPImage *);
 int readBMPIntoNewMemory(FILE *, struct BMPImage *);
 void bmp256ColorPaletteToVGAColorPalette(struct BMPImage*, struct VGAColor[]);
+void freeBMP(struct BMPImage *);
 
 #endif

game.c

@@ -10,6 +10,171 @@ struct BMPImage spritesheetImage;
 struct VGAColor vgaColors[256];
 
 struct SpriteRender arenaWallTop, arenaWallSide, arenaFloor;
+struct SpriteRender rabbit;
+
+void setupWallSprites() {
+  buildSpriteFromSpritesheet(
+    &spritesheetImage,
+    &arenaWallTop,
+    0, 0, 20, 20
+  );
+
+  buildSpriteFromSpritesheet(
+    &spritesheetImage,
+    &arenaWallSide,
+    20, 0, 20, 20
+  );
+
+  buildSpriteFromSpritesheet(
+    &spritesheetImage,
+    &arenaFloor,
+    40, 0, 20, 20
+  );
+}
+
+void setupRabbitSprites() {
+  buildSpriteFromSpritesheet(
+    &spritesheetImage,
+    &rabbit,
+    0, 20, 16, 16
+  );
+}
+
+char arenaLayout[10][10] = {
+  { 1, 1, 1, 1, 0, 0, 1, 1, 1, 1 },
+  { 1, 2, 2, 2, 0, 0, 2, 2, 2, 1 },
+  { 1, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
+  { 1, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
+  { 2, 0, 0, 0, 0, 0, 0, 0, 0, 2 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 1, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
+  { 1, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
+  { 1, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
+  { 1, 1, 1, 1, 0, 0, 1, 1, 1, 1 }
+};
+
+void renderArenaTile(int x, int y) {
+  char tile;
+  struct SpriteRender *target;
+
+  tile = arenaLayout[y][x];
+
+  switch (tile) {
+    case 0:
+      target = &arenaFloor;
+      break;
+    case 1:
+      target = &arenaWallTop;
+      break;
+    case 2:
+      target = &arenaWallSide;
+      break;
+  }
+
+  target->x = x * 20;
+  target->y = y * 20;
+
+  drawSprite(target);
+}
+
+void buildArena() {
+  int x, y;
+
+  for (y = 0; y < 10; ++y) {
+    for (x = 0; x < 10; ++x) {
+      renderArenaTile(x, y);
+    }
+  }
+}
+
+int rabbitPosition[2] = { 60, 60 };
+int rabbitLimits[2][2] = {
+  { 20, 20 },
+  { 180, 180 }
+};
+
+#define RABBIT_MOTION_DRAG (2)
+#define RABBIT_MOTION_ACCELERATION (5)
+#define RABBIT_MOTION_MAX_SPEED (12)
+
+signed char rabbitVelocity[2] = { 0, 0 };
+
+void renderRabbit() {
+  rabbit.x = rabbitPosition[0];
+  rabbit.y = rabbitPosition[1];
+
+  drawSprite(&rabbit);
+}
+
+void handleRabbitMovement() {
+  int i;
+
+  if (keyboardKeydownState.KEY_W) {
+    rabbitVelocity[1] -= RABBIT_MOTION_ACCELERATION;
+    if (rabbitVelocity[1] < -RABBIT_MOTION_MAX_SPEED) {
+      rabbitVelocity[1] = -RABBIT_MOTION_MAX_SPEED;
+    }
+  }
+  if (keyboardKeydownState.KEY_S) {
+    rabbitVelocity[1] += RABBIT_MOTION_ACCELERATION;
+    if (rabbitVelocity[1] > RABBIT_MOTION_MAX_SPEED) {
+      rabbitVelocity[1] = RABBIT_MOTION_MAX_SPEED;
+    }
+  }
+  if (keyboardKeydownState.KEY_A) {
+    rabbitVelocity[0] -= RABBIT_MOTION_ACCELERATION;
+    if (rabbitVelocity[0] < -RABBIT_MOTION_MAX_SPEED) {
+      rabbitVelocity[0] = -RABBIT_MOTION_MAX_SPEED;
+    }
+  }
+  if (keyboardKeydownState.KEY_D) {
+    rabbitVelocity[0] += RABBIT_MOTION_ACCELERATION;
+    if (rabbitVelocity[0] > RABBIT_MOTION_MAX_SPEED) {
+      rabbitVelocity[0] = RABBIT_MOTION_MAX_SPEED;
+    }
+  }
+
+  for (i = 0; i < 2; ++i) {
+    rabbitPosition[i] += (rabbitVelocity[i] / 5);
+
+    if (rabbitPosition[i] < rabbitLimits[0][i]) {
+      rabbitPosition[i] = rabbitLimits[0][i];
+    }
+    if (rabbitPosition[i] >= rabbitLimits[1][i]) {
+      rabbitPosition[i] = rabbitLimits[1][i];
+    }
+
+    if (rabbitVelocity[i] < 0) {
+      rabbitVelocity[i] += RABBIT_MOTION_DRAG;
+      if (rabbitVelocity[i] > 0) rabbitVelocity[i] = 0;
+    }
+    if (rabbitVelocity[i] > 0) {
+      rabbitVelocity[i] -= RABBIT_MOTION_DRAG;
+      if (rabbitVelocity[i] < 0) rabbitVelocity[i] = 0;
+    }
+  }
+}
+
+void drawOnlyRabbitArena() {
+  int rabbitLeftTileX, rabbitRightTileX,
+      rabbitTopTileY, rabbitBottomTileY;
+
+  rabbitLeftTileX = rabbitPosition[0] / 20;
+  rabbitRightTileX = (rabbitPosition[0] + 16) / 20;
+  rabbitTopTileY = rabbitPosition[1] / 20;
+  rabbitBottomTileY = (rabbitPosition[1] + 16) / 20;
+
+  renderArenaTile(rabbitLeftTileX, rabbitTopTileY);
+  if (rabbitLeftTileX != rabbitRightTileX) {
+    renderArenaTile(rabbitRightTileX, rabbitTopTileY);
+    if (rabbitTopTileY != rabbitBottomTileY) {
+      renderArenaTile(rabbitRightTileX, rabbitBottomTileY);
+    }
+  }
+  if (rabbitTopTileY != rabbitBottomTileY) {
+    renderArenaTile(rabbitLeftTileX, rabbitBottomTileY);
+  }
+}
 
 int main(void) {
   FILE *fh;
@@ -24,32 +189,33 @@ int main(void) {
   if (readBMPIntoNewMemory(fh, &spritesheetImage)) return 1;
   fclose(fh);
 
-  return 0;
-
   spritesheetImage.transparentColor = 0;
 
-  buildSpriteFromSpritesheet(
-    &spritesheetImage,
-    &arenaWallTop,
-    0, 0, 20, 20
-  );
+  setupWallSprites();
+  setupRabbitSprites();
 
   setVideoMode(VIDEO_MODE_VGA_256);
   bmp256ColorPaletteToVGAColorPalette(&spritesheetImage, vgaColors);
   setVGAColors(vgaColors, 256);
 
-  while (keepRunning) {
-    arenaWallTop.x = 0;
-    arenaWallTop.y = 0;
+  buildArena();
 
-    drawSprite(&arenaWallTop);
+  while (keepRunning) {
+    readMouse(&mouseStatus);
+    populateKeyboardKeydownState();
+    handleRabbitMovement();
 
     waitStartVbl();
 
+    drawOnlyRabbitArena();
+    renderRabbit();
     copyDrawBufferToDisplay();
 
     waitEndVbl();
+
+    if (mouseStatus.leftButtonDown) { keepRunning = 0; }
   }
+
   // states:
   // * main menu
   //   * play
@@ -71,5 +237,12 @@ int main(void) {
   //     * 
   //
 
+  freeBMP(&spritesheetImage);
+
+  setVideoMode(VIDEO_MODE_80x25_TEXT);
+  uninstallKeyboardHandler();
+
+  fprintf(stderr, "meow\n");
+  
   return 0;
 }

game.lnk

@@ -0,0 +1,2 @@
+NAME   game.exe
+FILE   game.o

makefile

@@ -1,13 +1,7 @@
-.c.obj
-	wcc386 -q $<
+obj = game.o bmpload.o mouse_io.o pc_stuff.o vga.o keyboard.o
 
-game.exe: bmpload.obj mouse_io.obj pc_stuff.obj vga.obj keyboard.obj game.obj
-  %write game.lnk NAME   $@
-  %write game.lnk SYSTEM DOS4G
-  %write game.lnk FILE   bmpload.obj
-  %write game.lnk FILE   mouse_io.obj
-  %write game.lnk FILE   pc_stuff.obj
-  %write game.lnk FILE   vga.obj
-  %write game.lnk FILE   keyboard.obj
-  %write game.lnk FILE   game.obj
-  wlink  @game.lnk
+.c.o:
+	wcc386 -q -bt=dos -q $<
+
+game.exe: $(obj)
+  wcl386 -q -bt=dos -l=dos4g $(obj)

mouse_io.c

@@ -1,8 +1,11 @@
 #include <dos.h>
 #include <conio.h>
+#include <i86.h>
 
 #include "mouse_io.h"
 
+struct MouseStatus *_status;
+
 int activateMouse(struct MouseStatus *status) {
   union REGS regs;
   int mouseActivated;
@@ -28,10 +31,12 @@ int activateMouse(struct MouseStatus *status) {
     int386(MOUSE_DRIVER_INTERRUPT, &regs, &regs);
   }
 
+  _status = status;
+
   return mouseActivated;
 }
 
-void readMouse(struct MouseStatus *status) {
+void readMouse() {
   union REGS regs;
   int buttonStatus;
 
@@ -39,10 +44,10 @@ void readMouse(struct MouseStatus *status) {
   int386(MOUSE_DRIVER_INTERRUPT, &regs, &regs);
 
   buttonStatus = regs.w.bx;
-  status->xPosition = regs.w.cx;
-  status->yPosition = regs.w.dx;
+  _status->xPosition = regs.w.cx;
+  _status->yPosition = regs.w.dx;
 
-  status->leftButtonDown = buttonStatus & 1;
-  status->rightButtonDown = (buttonStatus >> 1) & 1;
+  _status->leftButtonDown = buttonStatus & 1;
+  _status->rightButtonDown = (buttonStatus >> 1) & 1;
 }
 

setup.sh

@@ -0,0 +1,3 @@
+export WATCOM=~/Applications/open-watcom-v2/rel
+export INCLUDE=$WATCOM/h
+export PATH=$WATCOM/binl64:$WATCOM/binl:$PATH