Banding Artifact When Using OpenGL ES via ANGLE

SDL Development
1

Hi!

I am currently using ANGLE (http://angleproject.org) as a backend with SDL2 and have no significant problems under MacOS. However, when compiling for Win64 I get strange banding artifacts even with a simple test app:

angle_sdl_test
angle_sdl_test1846×1290 49.6 KB

It almost looks like the SDL surface is not an RGB888 surface although querying the surface type shows that.

I don’t have this problem when using SDL2 with common Desktop OpenGL. Likewise I don’t see a similar issue when executing the ANGLE sample applications. So it seems the issue only manifests when using both in combination.

I set up a minimal sample application on GitHub:

Any advice is appreciated! Thanks!
Thomas

1 Like
2

Hi
I had a similar problem. Try to explicitly specify the channel size:

    SDL_SetHint(SDL_HINT_OPENGL_ES_DRIVER, "1");
    SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
2 Likes
3

Great, thanks. That did the trick!

1 Like