[Mesa-dev] [Bug 32000] New: [glsl] Texture value get's corrupt as soon as it appears in if statement

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=32000

           Summary: [glsl] Texture value get's corrupt as soon as it
                    appears in if statement
           Product: Mesa
           Version: 7.9
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
        AssignedTo: mesa-dev at lists.freedesktop.org
        ReportedBy: manisandro at gmail.com


Created an attachment (id=40668)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=40668)
Shadow Mapping demo

Attached is a simple shadow mapping demo.
Problem:
In the fragment shader, as soon as the distanceFromLight variable or any
variable which had distanceFromLight as (part of) it's rvalue is placed inside
_any_ if statement, it's value becomes corrupt. distanceFromLight is the value
read via texture2D from a GL_DEPTH_ATTACHMENT texture.

Details:
See FragmentShader.glsl, where 5 main observations are made.

Notes:
- The program works fine with the nvidia proprietary driver
- glxinfo: 
OpenGL vendor string: Tungsten Graphics, Inc
OpenGL renderer string: Mesa DRI Mobile Intel® GM45 Express Chipset GEM
20100330 DEVELOPMENT 
OpenGL version string: 2.1 Mesa 7.9
OpenGL shading language version string: 1.20

- driver: xorg-x11-drv-intel-2.12.0-6.fc14.1.x86_64

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