Added OpenGL debug groups for most graphics operations when love is built in debug mode for iOS. The Xcode frame capture tool uses them to create nice visual groups for OpenGL function calls.

src/modules/graphics/opengl/Image.cpp

@@ -195,6 +195,8 @@ void Image::loadFromImageData()
 
 bool Image::loadVolatile()
 {
+	OpenGL::TempDebugGroup debuggroup("Image load");
+
 	if (isCompressed() && !hasCompressedTextureSupport(cdata->getFormat(), flags.sRGB))
 	{
 		const char *str;
@@ -346,6 +348,8 @@ bool Image::refresh(int xoffset, int yoffset, int w, int h)
 
 void Image::drawv(const Matrix &t, const Vertex *v)
 {
+	OpenGL::TempDebugGroup debuggroup("Image draw");
+
 	OpenGL::TempTransform transform(gl);
 	transform.get() *= t;