mesa3d-dev

[Mesa3d-dev] [Bug 27265] New: GLSL Compiler doesnt link the attached vertex shader

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=27265

           Summary: GLSL Compiler doesnt link the attached vertex shader
           Product: Mesa
           Version: 7.5
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: Mesa core
        AssignedTo: mes...@li...
        ReportedBy: kar...@ar...


Created an attachment (id=34365)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=34365)
Vertex Shader that fails to link

The attached vertex shader does not link. A call to 
glGetProgramiv(program, GL_LINK_STATUS, &result)after glLinkProgram  returns
GL_FALSE.

Attaching the code and the shaders.


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[Mesa3d-dev] [Bug 27265] GLSL Compiler doesnt link the attached vertex shader

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=27265





--- Comment #1 from Karthik Hariharakrishnan <kar...@ar...>  2010-03-23 07:33:37 PST ---
Created an attachment (id=34366)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=34366)
source code - sample GLES app 


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[Mesa3d-dev] [Bug 27265] GLSL Compiler doesnt link the attached vertex shader

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=27265





--- Comment #2 from Karthik Hariharakrishnan <kar...@ar...>  2010-03-23 07:34:03 PST ---
Created an attachment (id=34367)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=34367)
fragment shader used in main.c


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[Mesa3d-dev] [Bug 27265] GLSL Compiler doesnt link the attached vertex shader

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=27265


Kristof Ralovich <kri...@gm...> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #34365|application/octet-stream    |text/x-csrc
          mime type|                            |




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[Mesa3d-dev] [Bug 27265] GLSL Compiler doesnt link the attached vertex shader

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=27265


Kristof Ralovich <kri...@gm...> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #34367|application/octet-stream    |text/x-csrc
          mime type|                            |




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[Mesa3d-dev] [Bug 27265] GLSL Compiler doesnt link the attached vertex shader

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=27265





--- Comment #3 from Brian Paul <bri...@gm...>  2010-03-23 09:19:23 PST ---
Created an attachment (id=34368)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=34368)
do varying var allocation upon usage to use fewer regs

The fragment shader is trying to read a varying var that's never written to (or
declared in) the vertex shader.  So that's an error.

I modified the fragment shader accordingly and found the link still failed
because of too many varying vars.  However, a lot of varying vars are declared
but not actually used in the shader.

The following patch avoids allocating a register slot for varyings that aren't
used.  With this patch, the test works.  Want to give it a try?  I've only
lightly tested it so far.


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