Issue: [BUG] incorrect glDisable(GL_FRAMEBUFFER_SRGB) for MRT

1

Description

Hi,

I find the emulator will add a glDisable(GL_FRAMEBUFFER_SRGB) call in the underlying OpenGL implementation for every draw, if my current FBO contains SRGB color attachement in GL_COLOR_ATTACHMENT1 or 2, 3, etc.

If the GL_COLOR_ATTACHMENT0 is SRGB format, the emulator works correctly, it calls glEnable(GL_FRAMEBUFFER_SRGB) .

Maybe the underlying implementation only check color attachement 0.

Repro steps

  • Create a FBO contains 3 color attachments with format:
    color0 : rgb10a2
    color1 : rgba8_srgb
    color2 : rgba8_srgb
  • bind the fbo and make some drawcalls
  • you will see the emulator calls glDisable(GL_FRAMEBUFFER_SRGB) before every draw in some graphics debugger( such as Renderdoc).

Environment

  • SDK version: 18.2@5236813
  • Operating System/Device: Windows 10/ GTX 1060

Additional Info

2

Hi,

thanks for contacting us regarding this issue. Can you please tell me what kind of emulator are you using?

thansk,
Marton

3

I’m using the OpenGL ES emulator(libglesv2.dll) from Imagination’s PowerVR SDK. As far as I know, the emulator is called PVRVFrame, or at least a part of PVRVFrame.

4

Hi,

thank you, I’ve created a bug report, the ID is:
87540

bests,
Marton