Apply mask to foreground

1 files changed, 19 insertions, 8 deletions

diff --git a/main.c b/main.c
index b3824f4..e629966 100644
--- a/main.c
+++ b/main.c
@@ -14,7 +14,10 @@ SDL_Texture *createTiledTexture(SDL_Renderer *context, const char *filename) {
 
 	Uint32 pixelformat;
 	SDL_QueryTexture(texture_tile, &pixelformat, 0, 0, 0);
-	SDL_Texture *texture = SDL_CreateTexture(context, pixelformat, SDL_TEXTUREACCESS_STATIC | SDL_TEXTUREACCESS_TARGET, WINDOW_W, WINDOW_H);
+	SDL_Texture *texture = SDL_CreateTexture(context,
+		       	pixelformat,
+		       	SDL_TEXTUREACCESS_STATIC | SDL_TEXTUREACCESS_TARGET,
+		       	WINDOW_W, WINDOW_H);
 	SDL_SetRenderTarget(context, texture);
 	for (int y = 0; y < WINDOW_H; y += tile_h) {
 		for (int x = 0; x < WINDOW_W; x += tile_w) {
@@ -45,9 +48,18 @@ int main() {
 	SDL_Texture *background = createTiledTexture(context, "background.bmp");
 	SDL_Texture *foreground = createTiledTexture(context, "foreground.bmp");
 
-	// TODO:
-	// - Map has a mask generated by the game, of where the terrain (foregroud) exists
-	float *mask = calloc(WINDOW_W * WINDOW_H, 4);
+	SDL_Surface *mask_surface = SDL_CreateRGBSurfaceWithFormat(0,
+		       	WINDOW_W, WINDOW_H, 32, SDL_PIXELFORMAT_RGBA8888);
+
+	SDL_LockSurface(mask_surface);
+	for (int i = 0; i < mask_surface->w * mask_surface->h; i++) {
+		((Uint32 *)mask_surface->pixels)[i] = 0x000000ff;
+	}
+	for (int i = 0; i < mask_surface->w * 50; i++) {
+		((Uint32 *)mask_surface->pixels)[i] = 0xffffffff;
+	}
+	SDL_UnlockSurface(mask_surface);
+	SDL_Texture *terrain_texture = SDL_CreateTextureFromSurface(context, mask_surface);
 
 	int exit = 0;
 	while (!exit) {
@@ -59,11 +71,10 @@ int main() {
 		}
 		SDL_RenderCopy(context, background, 0, 0);
 		SDL_SetRenderTarget(context, foreground);
-
-		// TODO: Get masking right
-		SDL_SetTextureBlendMode(mask_texture, SDL_BLENDMODE_MUL);
-		SDL_RenderCopy(context, mask_texture, 0, 0);
+		SDL_SetTextureBlendMode(terrain_texture, SDL_BLENDMODE_MUL);
+		SDL_RenderCopy(context, terrain_texture, 0, 0);
 		SDL_SetRenderTarget(context, 0);
+		SDL_RenderCopy(context, foreground, 0, 0);
 
 		SDL_RenderPresent(context);
 		SDL_Delay(10);