Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
intSDL_RenderGeometryRaw(SDL_Renderer* renderer, SDL_Texture* texture, const(float)* xy, int xy_stride, const(SDL_Color)* color, int color_stride, const(float)* uv, int uv_stride, int num_vertices, const(void)* indices, int num_indices, int size_indices)