Haha!
It seems that x11 don’t want to create me a CORE profile, I have opengl errors when I call opengl functions.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include <iostream>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <GL/glew.h>
#include <GL/gl.h>
#include <GL/glx.h>
#define GLX_CONTEXT_MAJOR_VERSION_ARB 0x2091
#define GLX_CONTEXT_MINOR_VERSION_ARB 0x2092
#define glCheck(call) ((call), glCheckError(__FILE__, __LINE__))
typedef GLXContext (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, Bool, const int*);
// Helper to check for extension string presence. Adapted from:
// http://www.opengl.org/resources/features/OGLextensions/
static bool isExtensionSupported(const char *extList, const char *extension)
{
const char *start;
const char *where, *terminator;
/* Extension names should not have spaces. */
where = strchr(extension, ' ');
if (where || *extension == '\0')
return false;
/* It takes a bit of care to be fool-proof about parsing the
OpenGL extensions string. Don't be fooled by sub-strings,
etc. */
for (start=extList;;) {
where = strstr(start, extension);
if (!where)
break;
terminator = where + strlen(extension);
if ( where == start || *(where - 1) == ' ' )
if ( *terminator == ' ' || *terminator == '\0' )
return true;
start = terminator;
}
return false;
}
static bool ctxErrorOccurred = false;
static int ctxErrorHandler( Display *dpy, XErrorEvent *ev )
{
ctxErrorOccurred = true;
return 0;
}
void glCheckError(const char* file, unsigned int line)
{
// Get the last error
GLenum errorCode = glGetError();
if (errorCode != GL_NO_ERROR)
{
std::string fileString(file);
std::string error = "unknown error";
std::string description = "no description";
// Decode the error code
switch (errorCode)
{
case GL_INVALID_ENUM :
{
error = "GL_INVALID_ENUM";
description = "an unacceptable value has been specified for an enumerated argument";
break;
}
case GL_INVALID_VALUE :
{
error = "GL_INVALID_VALUE";
description = "a numeric argument is out of range";
break;
}
case GL_INVALID_OPERATION :
{
error = "GL_INVALID_OPERATION";
description = "the specified operation is not allowed in the current state";
break;
}
case GL_STACK_OVERFLOW :
{
error = "GL_STACK_OVERFLOW";
description = "this command would cause a stack overflow";
break;
}
case GL_STACK_UNDERFLOW :
{
error = "GL_STACK_UNDERFLOW";
description = "this command would cause a stack underflow";
break;
}
case GL_OUT_OF_MEMORY :
{
error = "GL_OUT_OF_MEMORY";
description = "there is not enough memory left to execute the command";
break;
}
case GL_INVALID_FRAMEBUFFER_OPERATION_EXT :
{
error = "GL_INVALID_FRAMEBUFFER_OPERATION_EXT";
description = "the object bound to FRAMEBUFFER_BINDING_EXT is not \"framebuffer complete\"";
break;
}
}
// Log the error
std::cerr << "An internal OpenGL call failed in "
<< fileString.substr(fileString.find_last_of("\\/") + 1) << " (" << line << ") : "
<< error << ", " << description
<< std::endl;
}
}
int main(int argc, char* argv[])
{
Display *display = XOpenDisplay(NULL);
if (!display)
{
printf("Failed to open X display
");
exit(1);
}
// Get a matching FB config
static int visual_attribs[] =
{
GLX_X_RENDERABLE , True,
GLX_DRAWABLE_TYPE , GLX_WINDOW_BIT,
GLX_RENDER_TYPE , GLX_RGBA_BIT,
GLX_X_VISUAL_TYPE , GLX_TRUE_COLOR,
GLX_RED_SIZE , 8,
GLX_GREEN_SIZE , 8,
GLX_BLUE_SIZE , 8,
GLX_ALPHA_SIZE , 8,
GLX_DEPTH_SIZE , 24,
GLX_STENCIL_SIZE , 8,
GLX_DOUBLEBUFFER , True,
GLX_SAMPLE_BUFFERS , 1,
GLX_SAMPLES , 4,
None
};
int glx_major, glx_minor;
// FBConfigs were added in GLX version 1.3.
if ( !glXQueryVersion( display, &glx_major, &glx_minor ) ||
( ( glx_major == 1 ) && ( glx_minor < 3 ) ) || ( glx_major < 1 ) )
{
printf("Invalid GLX version");
exit(1);
}
printf( "Getting matching framebuffer configs
" );
int fbcount;
GLXFBConfig* fbc = glXChooseFBConfig(display, DefaultScreen(display), visual_attribs, &fbcount);
if (!fbc)
{
printf( "Failed to retrieve a framebuffer config
" );
exit(1);
}
printf( "Found %d matching FB configs.
", fbcount );
// Pick the FB config/visual with the most samples per pixel
printf( "Getting XVisualInfos
" );
int best_fbc = -1, worst_fbc = -1, best_num_samp = -1, worst_num_samp = 999;
int i;
for (i=0; i<fbcount; ++i)
{
XVisualInfo *vi = glXGetVisualFromFBConfig( display, fbc[i] );
if ( vi )
{
int samp_buf, samples;
glXGetFBConfigAttrib( display, fbc[i], GLX_SAMPLE_BUFFERS, &samp_buf );
glXGetFBConfigAttrib( display, fbc[i], GLX_SAMPLES , &samples );
printf( " Matching fbconfig %d, visual ID 0x%2x: SAMPLE_BUFFERS = %d,"
" SAMPLES = %d
",
i, vi -> visualid, samp_buf, samples );
if ( best_fbc < 0 || samp_buf && samples > best_num_samp )
best_fbc = i, best_num_samp = samples;
if ( worst_fbc < 0 || !samp_buf || samples < worst_num_samp )
worst_fbc = i, worst_num_samp = samples;
}
XFree( vi );
}
GLXFBConfig bestFbc = fbc[ best_fbc ];
// Be sure to free the FBConfig list allocated by glXChooseFBConfig()
XFree( fbc );
// Get a visual
XVisualInfo *vi = glXGetVisualFromFBConfig( display, bestFbc );
printf( "Chosen visual ID = 0x%x
", vi->visualid );
printf( "Creating colormap
" );
XSetWindowAttributes swa;
Colormap cmap;
swa.colormap = cmap = XCreateColormap( display,
RootWindow( display, vi->screen ),
vi->visual, AllocNone );
swa.background_pixmap = None ;
swa.border_pixel = 0;
swa.event_mask = StructureNotifyMask;
printf( "Creating window
" );
Window win = XCreateWindow( display, RootWindow( display, vi->screen ),
0, 0, 100, 100, 0, vi->depth, InputOutput,
vi->visual,
CWBorderPixel|CWColormap|CWEventMask, &swa );
if ( !win )
{
printf( "Failed to create window.
" );
exit(1);
}
// Done with the visual info data
XFree( vi );
XStoreName( display, win, "GL 3.0 Window" );
printf( "Mapping window
" );
XMapWindow( display, win );
// Get the default screen's GLX extension list
const char *glxExts = glXQueryExtensionsString( display,
DefaultScreen( display ) );
// NOTE: It is not necessary to create or make current to a context before
// calling glXGetProcAddressARB
glXCreateContextAttribsARBProc glXCreateContextAttribsARB = 0;
glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc)
glXGetProcAddressARB( (const GLubyte *) "glXCreateContextAttribsARB" );
GLXContext ctx = 0;
// Install an X error handler so the application won't exit if GL 3.0
// context allocation fails.
//
// Note this error handler is global. All display connections in all threads
// of a process use the same error handler, so be sure to guard against other
// threads issuing X commands while this code is running.
ctxErrorOccurred = false;
int (*oldHandler)(Display*, XErrorEvent*) =
XSetErrorHandler(&ctxErrorHandler);
// Check for the GLX_ARB_create_context extension string and the function.
// If either is not present, use GLX 1.3 context creation method.
if ( !isExtensionSupported( glxExts, "GLX_ARB_create_context" ) ||
!glXCreateContextAttribsARB )
{
printf( "glXCreateContextAttribsARB() not found"
" ... using old-style GLX context
" );
ctx = glXCreateNewContext( display, bestFbc, GLX_RGBA_TYPE, 0, True );
}
// If it does, try to get a GL 3.0 context!
else
{
int context_attribs[] =
{
GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
GLX_CONTEXT_MINOR_VERSION_ARB, 3,
//GLX_CONTEXT_FLAGS_ARB , GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
None
};
printf( "Creating context
" );
ctx = glXCreateContextAttribsARB( display, bestFbc, 0,
True, context_attribs );
// Sync to ensure any errors generated are processed.
XSync( display, False );
if ( !ctxErrorOccurred && ctx )
printf( "Created GL 3.0 context
" );
else
{
// Couldn't create GL 3.0 context. Fall back to old-style 2.x context.
// When a context version below 3.0 is requested, implementations will
// return the newest context version compatible with OpenGL versions less
// than version 3.0.
// GLX_CONTEXT_MAJOR_VERSION_ARB = 1
context_attribs[1] = 1;
// GLX_CONTEXT_MINOR_VERSION_ARB = 0
context_attribs[3] = 0;
ctxErrorOccurred = false;
printf( "Failed to create GL 3.0 context"
" ... using old-style GLX context
" );
ctx = glXCreateContextAttribsARB( display, bestFbc, 0,
True, context_attribs );
}
}
// Sync to ensure any errors generated are processed.
XSync( display, False );
// Restore the original error handler
XSetErrorHandler( oldHandler );
if ( ctxErrorOccurred || !ctx )
{
printf( "Failed to create an OpenGL context
" );
exit(1);
}
// Verifying that context is a direct context
if ( ! glXIsDirect ( display, ctx ) )
{
printf( "Indirect GLX rendering context obtained
" );
}
else
{
printf( "Direct GLX rendering context obtained
" );
}
printf( "Making context current
" );
glXMakeCurrent( display, win, ctx );
const unsigned char* glslversion = glGetString(GL_SHADING_LANGUAGE_VERSION);
printf("%s
", glslversion);
const unsigned char* openglversion = glGetString(GL_VERSION);
printf("%s
", openglversion);
GLuint vertexArray;
glewExperimental = GL_TRUE;
GLenum status = glewInit();
if (status == GLEW_OK) {
printf("Glew initilized!
");
} else {
printf("Failed to initialise glew : %s
", glewGetErrorString(status));
}
glCheck(glGenVertexArrays(1, &vertexArray));
glCheck(glLoadIdentity());
glClearColor( 0, 0.5, 1, 1 );
glClear( GL_COLOR_BUFFER_BIT );
glXSwapBuffers ( display, win );
sleep( 1 );
glClearColor ( 1, 0.5, 0, 1 );
glClear ( GL_COLOR_BUFFER_BIT );
glXSwapBuffers ( display, win );
sleep( 1 );
glDeleteVertexArrays(1, &vertexArray);
glXDestroyContext( display, ctx );
glXMakeCurrent( display, 0, 0 );
XDestroyWindow( display, win );
XFreeColormap( display, cmap );
XCloseDisplay( display );
return 0;
}
Someone doesn’t know how to force x11 to create a core profile and not a compatibility profile ?