Re: [Mesa3d-users] Mesa 7.0.2 and GetAttributeLocation

[Brian P. <bri...@tu...>]

Utkarsh Ayachit wrote:
>  > Brian Paul wrote:
>> Utkarsh Ayachit wrote:
>>> Brian Paul wrote:
>>>  > Utkarsh Ayachit wrote:
>>>  >> Mesa 7.0.2 says that is supports OpenGL 2.1 however,
>>>  >> GetAttributeLocation results in the following error message:
>>>  >>
>>>  >> Mesa 7.0.2 implementation error: User called no-op dispatch function
>>>  >> (an unsupported extension function?)
>>>  >>
>>>  >> Am I missing something or are vertex attributes not supported at 
>>> all?
>>>  >
>> [...]
>>
>> I don't know how you're getting a Mesa error when it appears you're 
>> using NVIDIA's OpenGL.
>>
>> -Brian
>>
> 
> My bad: I am explicitly linking my application against Mesa, but forgot 
> to set the LD_LIBRARY_PATH when running glxinfo. Attached is the revised 
> output:

OK, does the problem occur with progs/demos/fslight.c?

It calls glGetAttribLocation via the pointer returned by 
glutGetProcAddress().  You can try calling glGetAttribLocation() 
directly too with this patch to fslight.c:

diff --git a/progs/demos/fslight.c b/progs/demos/fslight.c
index e6d83bf..27ad1ea 100644
--- a/progs/demos/fslight.c
+++ b/progs/demos/fslight.c
@@ -11,7 +11,7 @@
   * Brian Paul
   * 17 April 2003
   */
-
+#define GL_GLEXT_PROTOTYPES
  #include <assert.h>
  #include <string.h>
  #include <stdio.h>
@@ -518,7 +518,7 @@ Init(void)
     if (CoordAttrib) {
        int i;
        glBindAttribLocation_func(program, CoordAttrib, "coord");
-      i = glGetAttribLocation_func(program, "coord");
+      i = glGetAttribLocation/*_func*/(program, "coord");
        assert(i >= 0);
        if (i != CoordAttrib) {
           printf("Hmmm, NVIDIA bug?\n");


Either way, it works OK here.

-Brian