| Summary: | Segfault in glGetActiveUniformName | ||
|---|---|---|---|
| Product: | Mesa | Reporter: | Simon Budig <simon> |
| Component: | Mesa core | Assignee: | mesa-dev |
| Status: | RESOLVED NOTOURBUG | QA Contact: | |
| Severity: | major | ||
| Priority: | medium | ||
| Version: | 10.3 | ||
| Hardware: | x86-64 (AMD64) | ||
| OS: | Linux (All) | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: | Testcase | ||
Created attachment 109875 [details]
Testcase
This is a testcase triggering the crash for me.
Compile with
gcc -Wall -g -o bugtest bugtest.c -lglut -lGLEW -lGL -lm
Looks like there's more than one thing wrong here. glGetActiveUniformName is introduced with 3.1/ARB_uniform_buffer_object, which is not supported on Ironlake. Your test program ends up calling through a null function pointer, because GLEW never wired it up. On 2.1, your best option here is glGetActiveUniform. |
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I am trying to get some information about a compiled GL shader program, in particular I need to get information about the Uniform Variables used. The code I use is this: glGetProgramiv (program, GL_ACTIVE_UNIFORMS, &n_uniforms); fprintf (stderr, "%d uniforms:\n", n_uniforms); for (i = 0; i < n_uniforms; i++) { glGetActiveUniformName (program, i, 79, &namelen, name); name[namelen] = '\0'; fprintf (stderr, " %2d: %s\n", i, name); } I get a segfault within glGetActiveUniformName, something is wrong here. The same code works fine with the NVidia proprietary drivers. Some more information: GL_VERSION : 2.1 Mesa 10.3.2 GL_VENDOR : Intel Open Source Technology Center GL_RENDERER : Mesa DRI Intel(R) Ironlake Mobile GLEW_VERSION : 1.10.0 GLSL VERSION : 1.20 This is using debian unstable with libgl1-mesa-glx:amd64, 10.3.2-1, amd64 Valgrind is not really helpful, even with debug symbols installed: ==27042== Process terminating with default action of signal 11 (SIGSEGV) ==27042== Bad permissions for mapped region at address 0x0 ==27042== at 0x0: ??? ==27042== by 0x402BFF: main (shadertoy.c:458) ==27042==