https://bugs.freedesktop.org/show_bug.cgi?id=43138
Bug #: 43138
Summary: [glsl] fail to get the active attribute with function
glGetProgramiv
Classification: Unclassified
Product: Mesa
Version: 7.11
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
AssignedTo: mesa-dev@lists.freedesktop.org
ReportedBy: yi....@intel.com
System Environment:
--------------------------
Mesa:(7.11)21364bd09d6133f5da12986678fa995fa0aea7e4
Bug detailed description:
-------------------------
Fail to retrieve the correct number of active attribute with glGetProgramiv
with GL_ACTIVE_ATTRIBUTES.
The vertext shader is as following:
static const char vs_source[] =
"attribute float myAttribVar; \n"
"attribute float maxAttribVal; \n"
"void main() \n"
"{ \n"
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; \n"
" gl_FrontColor.x = myAttribVar / maxAttribVal; \n"
" gl_FrontColor.y = 0.0; \n"
" gl_FrontColor.z = 0.0; \n"
" gl_FrontColor.w = 1.0; \n"
"} \n";
And I assume to retrieve 3 active attributes: myAttribVar, maxAttribVal and
gl_Vertex with the line glGetProgramiv(prog, GL_ACTIVE_ATTRIBUTES, &count);
But the actual value is 2.
Reproduce steps:
-------------------------
Build and run the attachment, a piglit case.
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