https://bugs.freedesktop.org/show_bug.cgi?id=70327
Priority: medium
Bug ID: 70327
Assignee: [email protected]
Summary: Casting floating point variable to integer not working
properly while constant gets converted properly
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: [email protected]
Hardware: All
Status: NEW
Version: git
Component: Drivers/Gallium/r600
Product: Mesa
Created attachment 87353
--> https://bugs.freedesktop.org/attachment.cgi?id=87353&action=edit
Full rendered scene with bug visible
I've recently been working on converting the shaders used by the Dolphin
emulator to use integers instead of floating point numbers (for better
emulation accuracy). This seems to have exposed a bug in the r600g driver
possibly related to float->int casting.
The core of the issue is this GLSL code line:
"iprev.rgb = (iprev.rgb * (int(256.0-fog))) / 256;" (*)
where fog has been initialized before as
"float fog = clamp(ze - fog_uniform.z, 0.0, 1.0);"
The point is, while "fog" seems to be zero (a "fog==0.0" condition in the code
will return true), the pixel shader result of (*) is different than the one
that I get by substituting "fog" with 0.0. This gets very apparent in the
rendered scene, cf
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