[Bug 69689] New: FBO with GL_RGBA16F texture format silent drawing corruption

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bugzilla-daemon＠freedesktop.org

23 Sep 2013 23 Sep '13

2:25 a.m.

https://bugs.freedesktop.org/show_bug.cgi?id=69689

Priority: medium Bug ID: 69689 Assignee: dri-devel@lists.freedesktop.org Summary: FBO with GL_RGBA16F texture format silent drawing corruption Severity: major Classification: Unclassified OS: Linux (All) Reporter: freedesktop@lanrules.de Hardware: x86-64 (AMD64) Status: NEW Version: 9.2 Component: Drivers/Gallium/r600 Product: Mesa

I create an FBO with internal texture format GL_RGBA16F. I also tried GL_RGBA32F. Both work fine with my nVidia GPU.

With my ATI card it fails.

- No error is reported when creating and binding the FBO. - Blitting the FBO on screen results in random patterns (first run), then black output

System information: Caicos [Radeon HD 6450/7450/8450] Running on a Gallium 0.4 on AMD CAICOS from X.Org OpenGL version 3.0 Mesa 9.2.0 is supported Linux 3.10.10-1-ARCH kernel

GL feature data (useful? idk): GL_ARB_texture_float: OK GL_ARB_texture_buffer_object: OK [MISSING] GL_ARB_texture_buffer_object_rgb32: MISSING

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bugzilla-daemon＠freedesktop.org

23 Sep 23 Sep

2:01 p.m.

New subject: [Bug 69689] FBO with GL_RGBA16F texture format silent drawing corruption

https://bugs.freedesktop.org/show_bug.cgi?id=69689

--- Comment #1 from Alex Deucher agd5f@yahoo.com --- Make sure you set --enable-texture-float when configuring mesa.

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bugzilla-daemon＠freedesktop.org

24 Sep 24 Sep

6:17 a.m.

New subject: [Bug 69689] FBO with GL_RGBA16F texture format silent drawing corruption

https://bugs.freedesktop.org/show_bug.cgi?id=69689

--- Comment #2 from Johannes Jordan freedesktop@lanrules.de --- Thank you for your reply. The configure option --enable-texture-float is set. See: https://projects.archlinux.org/svntogit/packages.git/tree/trunk/PKGBUILD?h=p...

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bugzilla-daemon＠freedesktop.org

9:18 p.m.

New subject: [Bug 69689] FBO with GL_RGBA16F texture format silent drawing corruption

https://bugs.freedesktop.org/show_bug.cgi?id=69689

--- Comment #3 from Ian Romanick idr@freedesktop.org --- (In reply to comment #1)

...

Make sure you set --enable-texture-float when configuring mesa.

It should be since the driver is advertising OpenGL 3.0.

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bugzilla-daemon＠freedesktop.org

2 Oct 2 Oct

3:48 a.m.

New subject: [Bug 69689] FBO with GL_RGBA16F texture format silent drawing corruption

https://bugs.freedesktop.org/show_bug.cgi?id=69689

--- Comment #4 from Johannes Jordan freedesktop@lanrules.de --- I still have the problem and I can reproduce it. I am very willing to help in debugging the issue if you give me directions.

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bugzilla-daemon＠freedesktop.org

12 Nov 12 Nov

2:52 p.m.

New subject: [Bug 69689] FBO with GL_RGBA16F texture format silent drawing corruption

https://bugs.freedesktop.org/show_bug.cgi?id=69689

--- Comment #5 from Johannes Jordan freedesktop@lanrules.de --- Is there any chance this bug gets fixed?

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bugzilla-daemon＠freedesktop.org

3 p.m.

New subject: [Bug 69689] FBO with GL_RGBA16F texture format silent drawing corruption

https://bugs.freedesktop.org/show_bug.cgi?id=69689

--- Comment #6 from Grigori Goronzy greg@chown.ath.cx --- This works for me. Can you provide a test case?

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bugzilla-daemon＠freedesktop.org

13 Nov 13 Nov

6:11 a.m.

New subject: [Bug 69689] FBO with GL_RGBA16F texture format silent drawing corruption

https://bugs.freedesktop.org/show_bug.cgi?id=69689

--- Comment #7 from Johannes Jordan freedesktop@lanrules.de --- Created attachment 89120 --> https://bugs.freedesktop.org/attachment.cgi?id=89120&action=edit Testcase header file

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bugzilla-daemon＠freedesktop.org

6:12 a.m.

New subject: [Bug 69689] FBO with GL_RGBA16F texture format silent drawing corruption

https://bugs.freedesktop.org/show_bug.cgi?id=69689

--- Comment #8 from Johannes Jordan freedesktop@lanrules.de --- Created attachment 89121 --> https://bugs.freedesktop.org/attachment.cgi?id=89121&action=edit Testcase source file

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bugzilla-daemon＠freedesktop.org

6:16 a.m.

New subject: [Bug 69689] FBO with GL_RGBA16F texture format silent drawing corruption

https://bugs.freedesktop.org/show_bug.cgi?id=69689

--- Comment #9 from Johannes Jordan freedesktop@lanrules.de --- I am sorry my testcase uses Qt, but it would be much more time consuming for me to learn/rewrite everything without Qt.

This is the qmake file: # cat fbotest.pro QT += core gui opengl greaterThan(QT_MAJOR_VERSION, 4): QT += widgets TARGET = fbotest TEMPLATE = app SOURCES += fbotest.cpp HEADERS += fbotest.h

Then run qmake, make, ./fbotest

The testcase draws a rectangle and some text into a FBO, then blits it onto another FBO due to multisampling, finally draws the texture on screen. This is common practice.

Thank you for taking your time to try the testcase!

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bugzilla-daemon＠freedesktop.org

15 Nov 15 Nov

1:29 a.m.

New subject: [Bug 69689] FBO with GL_RGBA16F texture format silent drawing corruption

https://bugs.freedesktop.org/show_bug.cgi?id=69689

--- Comment #10 from Grigori Goronzy greg@chown.ath.cx --- This does not work because glBlitFramebuffer fails, since it is trying to blit between FBOs with different pixel formats. This isn't allowed, check for instance the OpenGL 3.3 core specification, section 4.3.2 or the EXT_framebuffer_multisample specification. They unambiguously state that read and draw framebuffer must have the same pixel format for blits that involve multisample framebuffers.

As far as I can see, this is not a problem with Mesa, but rather with your OpenGL compliance.

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bugzilla-daemon＠freedesktop.org

3:29 a.m.

New subject: [Bug 69689] FBO with GL_RGBA16F texture format silent drawing corruption

https://bugs.freedesktop.org/show_bug.cgi?id=69689

Johannes Jordan freedesktop@lanrules.de changed:

--- Comment #11 from Johannes Jordan freedesktop@lanrules.de --- Thank you for your time, I very much appreciate your detailed comment. I made my code compliant and now it works as expected.

I had made a different mistake when I tried with the same format for the blit target.

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bugzilla-daemon＠freedesktop.org