add rotating 3d cube

include/dangerzone/engine.h

@@ -9,6 +9,10 @@ typedef enum {
     OVERDRAW
 } framebuffer_e;
 
+typedef struct {
+    double x, y;
+} v2;
+
 typedef struct {
 	SDL_Event event;
 	bool is_running;
@@ -17,9 +21,9 @@ typedef struct {
 	SDL_Rect dirty_rect;
 	uint16_t width, height;
     // base layer ~ layer 0
-	uint32_t *framebuffer_base; 
+	uint32_t *framebuffer_base;
     // layer on top of that ~ layer 1
-    uint32_t *framebuffer_overdraw; 
+    uint32_t *framebuffer_overdraw;
 } game_state_t;
 
 extern game_state_t *game_state;

include/dangerzone/render/misc.h

@@ -4,16 +4,33 @@
 
 #include <stdint.h>
 
-void 
+void
 put_pixel(
     framebuffer_e framebuffer,
-	unsigned int x, 
-	unsigned int y, 
+	unsigned int x,
+	unsigned int y,
 	uint32_t color
 );
 
-void 
+void
 clear_framebuffer(
     framebuffer_e framebuffer,
 	uint32_t color
 );
+
+void
+put_line(
+    v2 a,
+    v2 b,
+    framebuffer_e framebuffer,
+    uint32_t color
+);
+
+void
+put_triangle(
+    v2 a,
+    v2 b,
+    v2 c,
+    framebuffer_e framebuffer,
+    uint32_t color
+);