SPRenderTexture creation causes OpenGL error 0x500

Andycorm

I'm trying to migrate my project to Sparrow 2.0 and unfortunately am running into issues. In particular, anytime I create any sort of SPRender Texture object, I get the message: There was an OpenGL error: 0x500, which is a bit frustrating, as I rather enjoy using render textures...

Anybody have any ideas as to what is going on? I tried opening up the sample "Barebones" project, stuck in a simple [[SPRenderTexture alloc] init] right after it adds the red SPQuad element within game.m and it promptly spit out the OpenGL error. Is it just me?

Andycorm

Hmm I seem to have stumbled across a work-around. Apparently OpenGL only complains if you try to create a Render Texture as the app initially loads. (I noticed that although the Demo app uses render textures, it *does not* load them on launch from what I can tell.) I have found that if I use the juggler's delayInvocationAtTarget method with even a minuscule delay, it's hunky dory, so I can probably just use that until someone finds a better solution.

Daniel

I'm just investigating this.

The error is actually caused by the method "glDiscardFramebufferEXT", which is called by GLKView (which is used by SPViewController).

It pops up in the beginning of the 2nd (!) frame, and the texture displays just fine beginning with the 3rd frame.

Until I have found the reason for this, you could also simply ignore the error; it doesn't seem to have any negative consequences. But I'd really love to know what's causing this ...

Nolithius

I tried to shortcut my development by jumping straight to the game screen, skipping the menu screen and started getting this error. Putting back the menu screen as the initial screen (which doesn't use any SPRenderTextures), fixed it.

However, I did notice a problem when this error popped up: many of my tiled sprites showed a thin, 0.5px-ish border between them, and these weren't using SPRenderTextures.

TTStu

Hi, any solution to this?

I just had a need to pull a UIImage out of my atlas, and used the renderToImage category found somewhere on this forum, and I am getting the "There was an OpenGL error: 0x500" error.

It doesn't appear to have any negative consequences at first glance though...

Daniel

If any of you could create a minimal demo project that showcases the problem, I might be able to pin the error down!