2 files changed, 49 insertions, 0 deletions

diff --git a/plat.c b/plat.c
index cc351ff..ef84eda 100644
--- a/plat.c
+++ b/plat.c
@@ -15,6 +15,31 @@ int btn_just_released(const App* a, Btn btn) {
 	return a->btn_states[btn] & btn_state_just_released;
 }
 
+typedef struct {
+	int x, y, w, h;
+	unsigned col;
+} Debug_Rect;
+
+#define max_debug_rects 128
+Debug_Rect debug_rects[max_debug_rects];
+int debug_rect_count;
+
+void ren_debug_rect(
+	int x,
+	int y,
+	int w,
+	int h,
+	unsigned colour
+) {
+	Debug_Rect* r = &debug_rects[debug_rect_count++];
+	assert(debug_rect_count < max_debug_rects);
+	r->x = x;
+	r->y = y;
+	r->w = w;
+	r->h = h;
+	r->col = colour;
+}
+
 #ifdef plat_posix
 #define _POSIX_SOURCE
 #define _GNU_SOURCE
@@ -419,6 +444,22 @@ void app_rencpy(
 		sx, sy,
 		w,  h
 	);
+#ifdef DEBUG
+	for (sj = 0; sj < debug_rect_count; sj++) {
+		const Debug_Rect* dr = &debug_rects[sj];
+		XSetForeground(i->d, i->gc, dr->col);
+		XFillRectangle(
+			i->d,
+			i->wi,
+			i->gc,
+			dr->x * s,
+			dr->y * s,
+		  dr->w * s,
+		  dr->h * s
+		 );
+	}
+#endif
+	debug_rect_count = 0;
 }
 
 void app_end(App* a) {
diff --git a/plat.h b/plat.h
index 32f17f6..687106d 100644
--- a/plat.h
+++ b/plat.h
@@ -85,4 +85,12 @@ int btn_pressed(const App* a, Btn btn);
 int btn_just_pressed(const App* a, Btn btn);
 int btn_just_released(const App* a, Btn btn);
 
+void ren_debug_rect(
+	int x,
+	int y,
+	int w,
+	int h,
+	unsigned colour
+);
+
 #endif