https://bugs.freedesktop.org/show_bug.cgi?id=28577
Summary: Incorrect specular highlights on backfaces
Product: Mesa
Version: unspecified
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
AssignedTo: mesa-dev@lists.freedesktop.org
ReportedBy: t.ev...@aranz.com
Created an attachment (id=36323)
--> (https://bugs.freedesktop.org/attachment.cgi?id=36323)
Test code that reproduces the problem
When rendering faces with:
* glLightModeli (GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);
* glLightModeli (GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
* glLightModeli (GL_LIGHT_MODEL_LOCAL_VIEWER, GL_FALSE);
* A infinite distance light.
The specular colour is applied incorrectly to backward faces. The faces show up
as the correct colour when they don't have a specular highlight, but as
full-intensity white when they have any specular.
Without separate specular the results are correct.
With local-viewer set to true, or with a non-infinite distance light, the
results are better but still wrong. The specular highlight doesn't go to full
white instantly but it's still brighter than it should be.
I'm attaching some simple code to reproduce the problem. It should show a red
and green square rotating on a blue background. As the square rotates the
correct specular highlight will show up on the red front face: a gradual
lightening from red to pink then back to red again. The green back face instead
goes instantly from green to white, then instantly back to green again.
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