draw sprite

3 files changed, 67 insertions, 1 deletions

diff --git a/src/main.c b/src/main.c
index db6a715..f44e527 100644
--- a/src/main.c
+++ b/src/main.c
@@ -11,8 +11,27 @@ main(void)
 		return 1;
 	}
 
+	PxSpr spr = {
+		8, 8,
+		(uint8_t[]){
+			2, 0, 0, 0, 0, 0, 3, 0,
+			0, 2, 0, 0, 0, 3, 0, 3,
+			0, 0, 2, 2, 2, 0, 4, 0,
+			0, 0, 0, 0, 0, 5, 0, 0,
+			0, 0, 0, 0, 7, 0, 0, 0,
+			0, 0, 0, 6, 0, 0, 0, 0,
+			0, 0, 0, 6, 0, 0, 0, 0,
+			7, 0, 0, 0, 0, 0, 0, 7
+		}
+	};
+
+	int x = 8, y = 8;
 	while (!TZR_ShouldQuit()) {
 		TZR_CycleEvents();
+		x -= TZR_IsKeyDown(SDL_SCANCODE_A);
+		x += TZR_IsKeyDown(SDL_SCANCODE_D);
+		y -= TZR_IsKeyDown(SDL_SCANCODE_W);
+		y += TZR_IsKeyDown(SDL_SCANCODE_S);
 
 		pxClipReset();
 		pxCls(1);
@@ -21,6 +40,9 @@ main(void)
 		pxPset(0, 1, pxPget(0, 0));
 		pxClip(25, 12, 32, 69);
 		pxCls(2);
+		pxClipReset();
+		pxSpr(&spr, x, y);
+		pxSpr(&spr, 24, 8, .iy=1, .h=2);
 
 		TZR_DrawBegin();
 		pxRender();
diff --git a/src/px.c b/src/px.c
index 3ac1ab7..7eed959 100644
--- a/src/px.c
+++ b/src/px.c
@@ -81,6 +81,30 @@ pxPget(int x, int y)
 	return pxbuf[x + y * PX_WIDTH];
 }
 
+void
+_pxSpr(const PxSprArgs *args)
+{
+	int w = (args->w < 0) ? (args->spr->w) : (args->w);
+	w = pxMin(w, args->spr->w - args->ix);
+
+	int h = (args->h < 0) ? (args->spr->h) : (args->h);
+	h = pxMin(h, args->spr->h - args->iy);
+
+	printf("%d %d\n", w, h);
+
+	for (int y = 0; y < h; y++) {
+		for (int x = 0; x < w; x++) {
+			const int dx = x + args->x;
+			const int dy = y + args->y;
+			const int ix = x + args->ix;
+			const int iy = y + args->iy;
+			const PxCol c = args->spr->data[ix + iy * args->spr->w];
+			if (c)
+				pxPset(dx, dy, c);
+		}
+	}
+}
+
 int
 pxMin(int a, int b)
 {
diff --git a/src/px.h b/src/px.h
index 871ff54..47ea705 100644
--- a/src/px.h
+++ b/src/px.h
@@ -12,13 +12,28 @@ typedef struct {
 	uint8_t r, g, b;
 } PxPal;
 
+typedef struct {
+	unsigned int w, h;
+	PxCol *data;
+} PxSpr;
+
+typedef struct {
+	int _;
+	PxSpr *spr;
+	int x;
+	int y;
+	int ix;
+	int iy;
+	int w;
+	int h;
+} PxSprArgs;
+
 extern PxCol pxbuf[PX_WIDTH * PX_HEIGHT];
 extern PxPal pxpal[256];
 
 void pxRender(void);
 
 /*** DRAW ***/
-
 /* Fill the clipping region with color 'c'. */
 void pxCls(PxCol c);
 
@@ -34,6 +49,11 @@ void pxPset(int x, int y, PxCol c);
 /* Get a pixel. */
 PxCol pxPget(int x, int y);
 
+/* Draw sprite. */
+#define pxSpr(...) _pxSpr(&(const PxSprArgs){ \
+	.ix=0, .iy=0, .w=-1, .h=-1, ._=0, __VA_ARGS__})
+void _pxSpr(const PxSprArgs *args);
+
 /*** MATH ***/
 int pxMin(int a, int b);
 int pxMax(int a, int b);