draw tile

4 files changed, 38 insertions, 6 deletions

diff --git a/demo.c b/demo.c
index 0a95626..7f49fb6 100644
--- a/demo.c
+++ b/demo.c
@@ -1,18 +1,14 @@
 #include "lzr.h"
 #include <dx/log.h>
 #include <stdbool.h>
-#include <stdlib.h>
-#include <time.h>
 
 int main(void)
 {
 	LZR_Config cfg = {400, 224, 60, 16, "LZR demo"};
 	if (LZR_Init(cfg))
 		return 1;
-	srand(time(NULL));
-	const int limit = 1 + (rand() & 15);
-	for (int i = 0; i < limit; i++)
-		LZR_ImageLoad("coucou.bmp");
+	LZR_ImageLoad("coucou.bmp");
+	LZR_ImageLoad("tset.bmp");
 	float darkness = 0.0f;
 	float dark_dir = 1.0f;
 	int x = 10;
@@ -45,6 +41,9 @@ int main(void)
 		LZR_DrawBegin();
 		LZR_DrawSetColor(0.9f, 0.9f, 0.8f);
 		LZR_DrawClear();
+		LZR_DrawSetColor(1.0f, 1.0f, 1.0f);
+		LZR_DrawTile(1, 2, 2, 2);
+		LZR_DrawTile(1, 4, 22, 2);
 		const float shade = 0.9 * (0.5f + darkness);
 		LZR_DrawSetColor(shade, shade, 0.0f);
 		LZR_DrawImageEx(0, x, y, &stg);
diff --git a/lzr.c b/lzr.c
index b2b13b4..89fe573 100644
--- a/lzr.c
+++ b/lzr.c
@@ -362,3 +362,35 @@ int LZR_DrawImageEx(int id, int x, int y, const LZR_ImageDrawSettings *stg)
 	}
 	return 0;
 }
+
+int LZR_DrawTile(int id, int tile, int x, int y)
+{
+	if (id < 0) {
+		dx_log_error("id is negative");
+		return -1;
+	}
+	if (id >= LZR_MAX_IMAGES || images[id].tex == NULL) {
+		dx_log_error("no image with id %d", id);
+		return -1;
+	}
+	if (tile < 0) {
+		dx_log_error("tile is negative");
+		return -1;
+	}
+	const int img_width = images[id].width / config.tile_size;
+	const int img_height = images[id].height / config.tile_size;
+	if (tile >= img_width * img_height) {
+		dx_log_error("tile exceeds boundaries");
+		return -1;
+	}
+	SDL_Rect src;
+	src.x = (tile % img_width) * config.tile_size;
+	src.y = (tile / img_width) * config.tile_size;
+	src.w = config.tile_size, src.h = config.tile_size;
+	const SDL_Rect dst = {x, y, config.tile_size, config.tile_size};
+	if (SDL_RenderCopy(renderer, images[id].tex, &src, &dst) < 0) {
+		dx_log_error("%s", SDL_GetError());
+		return -1;
+	}
+	return 0;
+}
diff --git a/lzr.h b/lzr.h
index 01d0f74..0aea47d 100644
--- a/lzr.h
+++ b/lzr.h
@@ -55,5 +55,6 @@ int LZR_DrawLine(int x0, int y0, int x1, int y1);
 int LZR_DrawRect(bool fill, int x, int y, int w, int h);
 int LZR_DrawImage(int id, int x, int y);
 int LZR_DrawImageEx(int id, int x, int y, const LZR_ImageDrawSettings *stg);
+int LZR_DrawTile(int id, int tile, int x, int y);
 
 #endif
diff --git a/tset.bmp b/tset.bmp
new file mode 100644
index 0000000..28290f8
--- /dev/null
+++ b/tset.bmp