Switch to 3D geometry

gpu.h

@@ -6,12 +6,11 @@
 
 #define SWAPCHAIN_IMG_BUFFER_SIZE 4
 
-typedef float vec2_t[3];
 typedef float vec3_t[3];
 typedef float mat4_t[16];
 
 typedef struct {
-	vec2_t position;
+	vec3_t position;
 	vec3_t colour;
 } vertex_t;