dos-vga-arena-shooter-game/arena.c

#include "bmpload.h"
#include "const.h"
#include "arena.h"

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 }
};

struct SpriteRender arenaWallTop, arenaWallSide, arenaFloor;

void setupWallSprites(struct BMPImage *spritesheetImage) {
  buildSpriteFromSpritesheet(
    spritesheetImage,
    &arenaWallTop,
    0, 0, 20, 20
  );

  buildSpriteFromSpritesheet(
    spritesheetImage,
    &arenaWallSide,
    20, 0, 20, 20
  );

  buildSpriteFromSpritesheet(
    spritesheetImage,
    &arenaFloor,
    40, 0, 20, 20
  );
}

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);
}

char arenaRedrawRequests[ARENA_HEIGHT_TILES][ARENA_WIDTH_TILES];

void clearArenaRedrawRequests() {
  int x, y;

  for (y = 0; y < ARENA_HEIGHT_TILES; ++y) {
    for (x = 0; x < ARENA_WIDTH_TILES; ++x) {
      arenaRedrawRequests[y][x] = 0;
    }
  }
}

void redrawArena() {
  int x, y;

  for (y = 0; y < ARENA_HEIGHT_TILES; ++y) {
    for (x = 0; x < ARENA_WIDTH_TILES; ++x) {
      if (arenaRedrawRequests[y][x]) {
        renderArenaTile(x, y);
        arenaRedrawRequests[y][x] = 0;
      }
    }
  }
}

void drawOnlyArena(struct SpriteBounds *bounds) {
  int leftTileX, rightTileX,
      topTileY, bottomTileY;

  leftTileX = bounds->left / TILE_SIZE;
  rightTileX = bounds->right / TILE_SIZE;
  topTileY = bounds->top / TILE_SIZE;
  bottomTileY = bounds->bottom / TILE_SIZE;

  arenaRedrawRequests[topTileY][leftTileX] = 1;
  arenaRedrawRequests[topTileY][rightTileX] = 1;
  arenaRedrawRequests[bottomTileY][leftTileX] = 1;
  arenaRedrawRequests[bottomTileY][rightTileX] = 1;
}

void buildArena() {
  int x, y;

  for (y = 0; y < 10; ++y) {
    for (x = 0; x < 10; ++x) {
      renderArenaTile(x, y);
    }
  }
}