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

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

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

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

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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=packages/mesa

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

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

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

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

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

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

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

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

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

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

Johannes Jordan <freedesktop@lanrules.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- 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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