first draft of 2d renderer api requirements

include/renderer2d.h

@@ -12,4 +12,16 @@ struct sw_renderer2d {
 
 struct sw_renderer2d *sw_renderer2d_create();
 
+/* Api needed:
+  - clear screen
+  - set color
+  - set texture (alternatively none)
+  - set repeat
+  - blend modes per draw call maybe?
+  - draw quad
+  - draw "sprite" (quad of same size as texture)
+  - draw line
+  - transform matrix stack
+ */
+
 #endif /* GUARD_2B56918289975E8AA8711D6E080ED4B9 */