You are requesting a 4.2 core context, so there are no display lists. They were deprecated since GL 3.0.
glGenLists returns 0, with a valid GLX context
Pregunta
I'm trying to get an gl context, bind a PixelBuffer draw things in it. I can verify that calls such as glClearColor works however I'm not able to generate any gl lists. I'm out of ideas, here's the code:
typedef GLXContext (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, Bool, const int*);
typedef Bool (*glXMakeContextCurrentARBProc)(Display*, GLXDrawable, GLXDrawable, GLXContext);
static glXCreateContextAttribsARBProc glXCreateContextAttribsARB = NULL;
static glXMakeContextCurrentARBProc glXMakeContextCurrentARB = NULL;
glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc) glXGetProcAddressARB( (const GLubyte *) "glXCreateContextAttribsARB" );
glXMakeContextCurrentARB = (glXMakeContextCurrentARBProc) glXGetProcAddressARB( (const GLubyte *) "glXMakeContextCurrent" );
const char *displayName = NULL;
Display* display = XOpenDisplay( displayName );
static int visualAttribs[] = { None };
int numberOfFramebufferConfigurations = 0;
GLXFBConfig* fbConfigs = glXChooseFBConfig( display, DefaultScreen(display), visualAttribs, &numberOfFramebufferConfigurations );
if (!fbConfigs)
{
fprintf(stderr, "The OpenGL on this system does not support glXCreateContextAttribsARB or glXMakeContextCurrent.");
return;
}
int context_attribs[] = {
GLX_CONTEXT_MAJOR_VERSION_ARB, 4,
GLX_CONTEXT_MINOR_VERSION_ARB, 2,
GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_DEBUG_BIT_ARB,
GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
None
};
GLXContext openGLContext = glXCreateContextAttribsARB( display, fbConfigs[0], 0, True, context_attribs);
int pbufferAttribs[] = {
GLX_PBUFFER_WIDTH, cols,
GLX_PBUFFER_HEIGHT, rows,
None
};
GLXPbuffer pbuffer = glXCreatePbuffer( display, fbConfigs[0], pbufferAttribs );
// clean up:
XFree( fbConfigs );
XSync( display, False );
if (glXMakeContextCurrent( display, pbuffer, pbuffer, openGLContext ) )
{
if (openGLContext)
fprintf(stdout, "Got context \n");
GLuint list = glGenLists(1);
fprintf(stdout, "Got list %d\n", list); // This is always zero.
glNewList(list, GL_COMPILE);
glEndList();
glClearColor(0, 1, 0, 0);
Solución
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