glCompileShaderARB crashes

[Rainer_Deyke]

Not sure if this is the right place to post this…

I’ve got a program that crashes on glCompileShaderARB. The problem seems to be related to the use of gl_TexCoord in a GLSL fragment shader. I’ve reduced it to the following minimal example:

#include "SDL.h"
#include "GL/glew.h"

char const *shader_source =
  "uniform sampler2D texture;
"
  "void main()
"
  "{
"
  "  gl_FragColor = texture2D(texture, gl_TexCoord[0].st);
"
  "}
";

int main(int, char *[])
{
  SDL_Init(SDL_INIT_VIDEO);
  SDL_SetVideoMode(640, 480, 32, SDL_OPENGL);
  glewInit();
  GLhandleARB shader = glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
  glShaderSourceARB(shader, 1, &shader_source, 0);
  glCompileShaderARB(shader);
  SDL_Quit();
  return 0;
}

This crashes on my Mac Mini. It does not crash on any other computer I’ve tried, but I’ve only tried one other computer. The Mac Mini has OS X 10.3.8 installed, and identifies its video card as ATY,RV280, vendor ATI. This looks like a driver bug to me, although I don’t want to rule out other possibilities.

Questions: Can anybody confirm this bug? How widespread is it? Are there any known workarounds?

[Java_Cool_Dude]

RV280 (based on the dinosaur that is R200) doesn’t support GLSL.
Get yourself at least something based on the R300 or NV30 architecture.

[Rainer_Deyke]

Upgrading my hardware isn’t really a solution, since other people will still be running on old hardware. BTW, my Mac Mini might be very low end crap, but it isn’t actually more than a couple of months old.

Actually my program runs fine on most OpenGL cards, including very old cards. I use GLEW_ARB_fragment_shader to detect if GLSL fragment shaders are supported, use a fragment shader if available, and use a workaround if not. My Mac Mini reports that GLSL fragment shaders are supported.

If the RV280 erronously claims to support fragment shaders, then I have the following options:

[ul][li]Never use fragment shaders and always use the workaround.[]Try to somehow detect if the hardware erronously claims to support GLSL fragment shaders.[]Leave the decision up to the user.[*]Fail to run on hardware that erronously claims to support GLSL shaders.[/ul][/li]None of these options seem very attractive to me.

[jra101]

The current release of Mac OS X doesn’t really support GLSL on any card (any your specifically will never run ARB_fragment_shader in hardware) but does advertise most of the GLSL extensions, which the exception of GL_ARB_shading_language_100.

They support the GLSL API, but the actual shader compiler isn’t in there.