add a user_data parameter for render loop callback functions

examples/main.cpp

@@ -261,7 +261,7 @@ orbitPositionZ0(vec4* pos, float angle)
 }
 
 void
-render_cb_pre(RenderState* rs)
+render_cb_pre(RenderState* rs, void* user_data = nullptr)
 {
 	SDL_Event e;
 
@@ -332,7 +332,7 @@ main()
 			return 1;
 		}
 
-		doRenderLoop(rs, 60, render_cb_pre, nullptr);
+		doRenderLoop(rs, 60, render_cb_pre, nullptr, nullptr);
 
 		freeRenderState(rs);
 		return 0;

include/tangerine.h

@@ -234,7 +234,7 @@ Entity* getFreeEntity(RenderGroup* rg);
 Entity* getEntityByName(RenderGroup* rg, const char* name);
 
 // NOTE: callback function signature to use with renDoRenderLoop()
-typedef void (*frame_callback_fn) (RenderState*);
+typedef void (*frame_callback_fn) (RenderState*, void*);
 
 // NOTE: There are 2 callbacks to use here, cb_func_pre is called before
 // 	the call to renRenderFrame(), cb_fun_post is called after
@@ -243,7 +243,8 @@ typedef void (*frame_callback_fn) (RenderState*);
 void doRenderLoop(RenderState* rs,
 	uint framerate = 60,
 	frame_callback_fn cb_func_pre = nullptr,
-	frame_callback_fn cb_func_post = nullptr);
+	frame_callback_fn cb_func_post = nullptr,
+	void* user_data = nullptr);
 
 void renderFrame(RenderState* rs, const GLClearColor& clear_col);
 

src/tangerine.cpp

@@ -175,7 +175,8 @@ void
 doRenderLoop(RenderState* rs,
 	u32 framerate,
 	frame_callback_fn cb_func_pre,
-	frame_callback_fn cb_func_post)
+	frame_callback_fn cb_func_post,
+	void* user_data)
 {
 	u32 delay = (framerate > 0) ? 1 / framerate : 0;
 	u32 frameStart, frameTime;
@@ -186,7 +187,7 @@ doRenderLoop(RenderState* rs,
 		frameStart = SDL_GetTicks();
 
 		if (cb_func_pre != nullptr) {
-			cb_func_pre(rs);
+			cb_func_pre(rs, user_data);
 		} else {
 			while (SDL_PollEvent(&e)) {
 				if (e.type == SDL_QUIT ||
@@ -201,7 +202,7 @@ doRenderLoop(RenderState* rs,
 		renderFrame(rs, rs->clear_col);
 
 		if (cb_func_post != nullptr)
-			cb_func_post(rs);
+			cb_func_post(rs, user_data);
 
 		SDL_GL_SwapWindow(rs->handles.window);
 		frameTime = SDL_GetTicks() - frameStart;