work towards DeferredCommandDraw being universal, support for DeferredCommandDepthRange, rework of cirlce mesh (has a bug still), get_quad_element_buffer() now more general, as it should be with gl_any

src/rendering/twn_draw_c.h

@@ -20,7 +20,10 @@
 extern Matrix4 camera_projection_matrix;
 extern Matrix4 camera_look_at_matrix;
 
+
 #define QUAD_ELEMENT_BUFFER_LENGTH (65536 / 6)
+#define CIRCLE_VERTICES_MAX 2048
+#define CIRCLE_ELEMENT_BUFFER_LENGTH (CIRCLE_VERTICES_MAX * 3)
 
 
 typedef GLuint VertexBuffer;
@@ -129,11 +132,9 @@ void render_queue_clear(void);
 /* fills two existing arrays with the geometry data of a circle */
 /* the size of indices must be at least 3 times the number of vertices */
 void create_circle_geometry(Vec2 position,
-                            Color color,
                             float radius,
                             size_t num_vertices,
-                            SDL_Vertex vertices[],
-                            int indices[]);
+                            Vec2 vertices[]);
 
 struct QuadBatch {
     size_t size;             /* how many primitives are in current batch */
@@ -191,6 +192,8 @@ void set_depth_range(double low, double high);
 
 VertexBuffer get_quad_element_buffer(void);
 
+VertexBuffer get_circle_element_buffer(void);
+
 void render_circle(const CirclePrimitive *circle);
 
 void render_rectangle(const RectPrimitive *rectangle);