Bug 13751

Summary:	glGetActiveUniform returns size in wrong units
Product:	Mesa	Reporter:	Bruce Merry <bmerry>
Component:	Mesa core	Assignee:	mesa-dev
Status:	RESOLVED DUPLICATE	QA Contact:
Severity:	normal
Priority:	medium
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	Demo; requires GLEW and GLUT

Description Bruce Merry 2007-12-20 03:28:58 UTC

Page 81 of the the OpenGL 2.1 spec states "the value in size is in units of the type returned in type". Mesa 7.0.2, however, returns a count of scalars. I will attach a test program which demonstrates this: it queries a 4x4 matrix and receives a size of 16 instead of 1.

I haven't written a test for it, but eye-balling the code for glGetActiveAttrib makes me suspect that the same bug is present there.

Comment 1 Bruce Merry 2007-12-20 03:33:17 UTC

Created attachment 13251 [details]
Demo; requires GLEW and GLUT

Compile with 
gcc -o glsl-size glsl-size.c -Wall -g -lGLEW -lglut -lGL

Comment 2 Bruce Merry 2007-12-20 03:36:35 UTC

The choice of versions in Bugzilla is quite out of date. I left the version as unspecified because 7.0.2 (or 7.x) wasn't on the list, but it's stock 7.0.2 rather than CVS.

Comment 3 Brian Paul 2007-12-20 08:06:57 UTC

Fixed in git. Thanks.

Comment 4 Bruce Merry 2007-12-21 06:07:11 UTC

sizeof_glsl_type returns the wrong value for GL_FLOAT_MAT4x3: it returns 12 but it should be 16.

Comment 5 Bruce Merry 2007-12-21 13:33:59 UTC

Labelled this a dupe of 13753, since the remaining work is incorporated into the patches I posted there (the 2x3 case was also wrong).

*** This bug has been marked as a duplicate of bug 13753 ***

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