static int GL_RenderClear(SDL_Renderer * renderer) { GL_RenderData *data = (GL_RenderData *) renderer->driverdata; GL_ActivateRenderer(renderer); data->glClearColor((GLfloat) renderer->r * inv255f, (GLfloat) renderer->g * inv255f, (GLfloat) renderer->b * inv255f, (GLfloat) renderer->a * inv255f); data->glClear(GL_COLOR_BUFFER_BIT); return 0; }