/*!
* This function implements OpenGL context creation using GLX
* and a Pbuffer if GLX version is 1.4 or higher, or a XPixmap
* otherwise.
* \returns
* - ::GR3_ERROR_NONE on success
* - ::GR3_ERROR_INIT_FAILED if initialization failed
*/
int gr3_initGL_GLX_(void) {
int major, minor;
int fbcount;
GLXFBConfig *fbc;
GLXFBConfig fbconfig = (GLXFBConfig) NULL;
gr3_log_("gr3_initGL_GLX_();");
display = XOpenDisplay(0);
if (!display) {
gr3_log_("Not connected to an X server!");
return GR3_ERROR_INIT_FAILED;
}
context = glXGetCurrentContext();
if (context != NULL) {
gr3_appendtorenderpathstring_("GLX (existing context)");
} else {
glXQueryVersion(display,&major,&minor);
if (major > 1 || minor >=4) {
int i;
int fb_attribs[] =
{
GLX_DRAWABLE_TYPE , GLX_PBUFFER_BIT,
GLX_RENDER_TYPE , GLX_RGBA_BIT,
None
};
int pbuffer_attribs[] =
{
GLX_PBUFFER_WIDTH , 1,
GLX_PBUFFER_HEIGHT , 1,
None
};
gr3_log_("(Pbuffer)");
fbc = glXChooseFBConfig(display, DefaultScreen(display), fb_attribs,
&fbcount);
if (fbcount == 0) {
gr3_log_("failed to find a valid a GLX FBConfig for a RGBA PBuffer");
XFree(fbc);
XCloseDisplay(display);
return GR3_ERROR_INIT_FAILED;
}
for (i = 0; i < fbcount && !pbuffer; i++) {
fbconfig = fbc[i];
pbuffer = glXCreatePbuffer(display, fbconfig, pbuffer_attribs);
}
XFree(fbc);
if (!pbuffer) {
gr3_log_("failed to create a RGBA PBuffer");
XCloseDisplay(display);
return GR3_ERROR_INIT_FAILED;
}
context = glXCreateNewContext(display, fbconfig, GLX_RGBA_TYPE, None, True);
glXMakeContextCurrent(display,pbuffer,pbuffer,context);
context_struct_.terminateGL = gr3_terminateGL_GLX_Pbuffer_;
context_struct_.gl_is_initialized = 1;
gr3_appendtorenderpathstring_("GLX (Pbuffer)");
} else {
XVisualInfo *visual;
int fb_attribs[] =
{
GLX_DRAWABLE_TYPE , GLX_PIXMAP_BIT,
GLX_RENDER_TYPE , GLX_RGBA_BIT,
None
};
gr3_log_("(XPixmap)");
fbc = glXChooseFBConfig(display, DefaultScreen(display), fb_attribs,
&fbcount);
if (fbcount == 0) {
gr3_log_("failed to find a valid a GLX FBConfig for a RGBA Pixmap");
XFree(fbc);
XCloseDisplay(display);
return GR3_ERROR_INIT_FAILED;
}
fbconfig = fbc[0];
XFree(fbc);
context = glXCreateNewContext(display, fbconfig, GLX_RGBA_TYPE, None, True);
visual = glXGetVisualFromFBConfig(display,fbconfig);
pixmap = XCreatePixmap(display,XRootWindow(display,DefaultScreen(display)),1,1,visual->depth);
if (glXMakeContextCurrent(display,pixmap,pixmap,context)) {
context_struct_.terminateGL = gr3_terminateGL_GLX_Pixmap_;
context_struct_.gl_is_initialized = 1;
gr3_appendtorenderpathstring_("GLX (XPixmap)");
} else {
gr3_log_("failed to make GLX OpenGL Context current with a Pixmap");
glXDestroyContext(display, context);
XFreePixmap(display,pixmap);
XCloseDisplay(display);
return GR3_ERROR_INIT_FAILED;
}
}
}
/* Load Function pointers */ {
#ifdef GR3_CAN_USE_VBO
glBufferData = (PFNGLBUFFERDATAPROC)glXGetProcAddress((const GLubyte *)"glBufferData");
glBindBuffer = (PFNGLBINDBUFFERPROC)glXGetProcAddress((const GLubyte *)"glBindBuffer");
glGenBuffers = (PFNGLGENBUFFERSPROC)glXGetProcAddress((const GLubyte *)"glGenBuffers");
glDeleteBuffers = (PFNGLGENBUFFERSPROC)glXGetProcAddress((const GLubyte *)"glDeleteBuffers");
glVertexAttribPointer = (PFNGLVERTEXATTRIBPOINTERPROC)glXGetProcAddress((const GLubyte *)"glVertexAttribPointer");
glGetAttribLocation = (PFNGLGETATTRIBLOCATIONPROC)glXGetProcAddress((const GLubyte *)"glGetAttribLocation");
glEnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC)glXGetProcAddress((const GLubyte *)"glEnableVertexAttribArray");
glUseProgram = (PFNGLUSEPROGRAMPROC)glXGetProcAddress((const GLubyte *)"glUseProgram");
glDeleteShader = (PFNGLDELETESHADERPROC)glXGetProcAddress((const GLubyte *)"glDeleteShader");
glLinkProgram = (PFNGLLINKPROGRAMPROC)glXGetProcAddress((const GLubyte *)"glLinkProgram");
glAttachShader = (PFNGLATTACHSHADERPROC)glXGetProcAddress((const GLubyte *)"glAttachShader");
glCreateShader = (PFNGLCREATESHADERPROC)glXGetProcAddress((const GLubyte *)"glCreateShader");
glCompileShader = (PFNGLCOMPILESHADERPROC)glXGetProcAddress((const GLubyte *)"glCompileShader");
glCreateProgram = (PFNGLCREATEPROGRAMPROC)glXGetProcAddress((const GLubyte *)"glCreateProgram");
glDeleteProgram = (PFNGLDELETEPROGRAMPROC)glXGetProcAddress((const GLubyte *)"glDeleteProgram");
glUniform3f = (PFNGLUNIFORM3FPROC)glXGetProcAddress((const GLubyte *)"glUniform3f");
glUniformMatrix4fv = (PFNGLUNIFORMMATRIX4FVPROC)glXGetProcAddress((const GLubyte *)"glUniformMatrix4fv");
glUniform4f = (PFNGLUNIFORM4FPROC)glXGetProcAddress((const GLubyte *)"glUniform4f");
glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)glXGetProcAddress((const GLubyte *)"glGetUniformLocation");
glShaderSource = (PFNGLSHADERSOURCEPROC)glXGetProcAddress((const GLubyte *)"glShaderSource");
#endif
glDrawBuffers = (PFNGLDRAWBUFFERSPROC)glXGetProcAddress((const GLubyte *)"glDrawBuffers");
/*glBlendColor = (PFNGLBLENDCOLORPROC)glXGetProcAddress((const GLubyte *)"glBlendColor");*/
#ifdef GL_ARB_framebuffer_object
glBindRenderbuffer = (PFNGLBINDRENDERBUFFERPROC)glXGetProcAddress((const GLubyte *)"glBindRenderbuffer");
glCheckFramebufferStatus = (PFNGLCHECKFRAMEBUFFERSTATUSPROC)glXGetProcAddress((const GLubyte *)"glCheckFramebufferStatus");
glFramebufferRenderbuffer = (PFNGLFRAMEBUFFERRENDERBUFFERPROC)glXGetProcAddress((const GLubyte *)"glFramebufferRenderbuffer");
glRenderbufferStorage = (PFNGLRENDERBUFFERSTORAGEPROC)glXGetProcAddress((const GLubyte *)"glRenderbufferStorage");
glBindFramebuffer = (PFNGLBINDFRAMEBUFFERPROC)glXGetProcAddress((const GLubyte *)"glBindFramebuffer");
glGenFramebuffers = (PFNGLGENFRAMEBUFFERSPROC)glXGetProcAddress((const GLubyte *)"glGenFramebuffers");
glGenRenderbuffers = (PFNGLGENRENDERBUFFERSPROC)glXGetProcAddress((const GLubyte *)"glGenRenderbuffers");
glDeleteFramebuffers = (PFNGLDELETEFRAMEBUFFERSPROC)glXGetProcAddress((const GLubyte *)"glDeleteFramebuffers");
glDeleteRenderbuffers = (PFNGLDELETERENDERBUFFERSPROC)glXGetProcAddress((const GLubyte *)"glDeleteRenderbuffers");
#endif
#ifdef GL_EXT_framebuffer_object
glBindRenderbufferEXT = (PFNGLBINDRENDERBUFFEREXTPROC)glXGetProcAddress((const GLubyte *)"glBindRenderbufferEXT");
glCheckFramebufferStatusEXT = (PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC)glXGetProcAddress((const GLubyte *)"glCheckFramebufferStatusEXT");
glFramebufferRenderbufferEXT = (PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC)glXGetProcAddress((const GLubyte *)"glFramebufferRenderbufferEXT");
glRenderbufferStorageEXT = (PFNGLRENDERBUFFERSTORAGEEXTPROC)glXGetProcAddress((const GLubyte *)"glRenderbufferStorageEXT");
glBindFramebufferEXT = (PFNGLBINDFRAMEBUFFEREXTPROC)glXGetProcAddress((const GLubyte *)"glBindFramebufferEXT");
glGenFramebuffersEXT = (PFNGLGENFRAMEBUFFERSEXTPROC)glXGetProcAddress((const GLubyte *)"glGenFramebuffersEXT");
glGenRenderbuffersEXT = (PFNGLGENRENDERBUFFERSEXTPROC)glXGetProcAddress((const GLubyte *)"glGenRenderbuffersEXT");
glDeleteFramebuffersEXT = (PFNGLDELETEFRAMEBUFFERSEXTPROC)glXGetProcAddress((const GLubyte *)"glDeleteFramebuffersEXT");
glDeleteRenderbuffersEXT = (PFNGLDELETERENDERBUFFERSEXTPROC)glXGetProcAddress((const GLubyte *)"glDeleteRenderbuffersEXT");
#endif
}
return GR3_ERROR_NONE;
}
int gr3_initGL_WIN_(void) {
WNDCLASS wndclass;
gr3_log_("gr3_initGL_WIN_();");
glrc = wglGetCurrentContext();
if (!glrc) {
/* Register the frame class */
wndclass.style = 0;
wndclass.lpfnWndProc = DefWindowProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = g_hInstance;
wndclass.hIcon = NULL;
wndclass.hCursor = LoadCursor (NULL,IDC_ARROW);
wndclass.hbrBackground = NULL;
wndclass.lpszMenuName = "OpenGLWindow";
wndclass.lpszClassName = "OpenGLWindow";
if (RegisterClass(&wndclass)) {
/*fprintf(stderr,"Window Class registered successfully.\n"); */
} else {
gr3_log_("failed to register a window class");
return FALSE;
}
hWnd = CreateWindow ("OpenGLWindow",
"Generic OpenGL Sample",
0,
0,
0,
1,
1,
NULL,
NULL,
g_hInstance,
NULL);
if (hWnd != NULL) {
/*fprintf(stderr,"Window created successfully.\n"); */
} else {
gr3_log_("failed to create a window");
RETURN_ERROR(GR3_ERROR_INIT_FAILED);
}
dc = GetDC(hWnd);
/* Pixel Format selection */ {
PIXELFORMATDESCRIPTOR pfd;
int iPixelFormat;
BOOL result;
memset(&pfd,0,sizeof(pfd));
pfd.nSize = sizeof(pfd);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cAlphaBits = 8;
pfd.cDepthBits = 24;
pfd.iLayerType = PFD_MAIN_PLANE;
iPixelFormat = ChoosePixelFormat(dc,&pfd);
result = SetPixelFormat(dc,iPixelFormat, &pfd);
if (result) {
/*fprintf(stderr,"Pixel Format set for Device Context successfully.\n");*/
} else {
gr3_log_("failed to set a pixel format for the device context");
RETURN_ERROR(GR3_ERROR_INIT_FAILED);
}
}
/* OpenGL Rendering Context creation */ {
BOOL result;
glrc = wglCreateContext(dc);
if (glrc != NULL) {
/*fprintf(stderr,"OpenGL Rendering Context was created successfully.\n");*/
} else {
gr3_log_("failed to create an OpenGL context for the device context");
RETURN_ERROR(GR3_ERROR_INIT_FAILED);
}
result = wglMakeCurrent(dc,glrc);
if (result) {
/*fprintf(stderr,"OpenGL Rendering Context made current successfully.\n");*/
} else {
gr3_log_("failed to make OpenGL context current with the device context");
RETURN_ERROR(GR3_ERROR_INIT_FAILED);
}
}
}
/* Load Function pointers */ {
#ifdef GR3_CAN_USE_VBO
glBufferData = (PFNGLBUFFERDATAPROC)wglGetProcAddress("glBufferData");
glBindBuffer = (PFNGLBINDBUFFERPROC)wglGetProcAddress("glBindBuffer");
glGenBuffers = (PFNGLGENBUFFERSPROC)wglGetProcAddress("glGenBuffers");
glDeleteBuffers = (PFNGLGENBUFFERSPROC)wglGetProcAddress("glDeleteBuffers");
glVertexAttribPointer = (PFNGLVERTEXATTRIBPOINTERPROC)wglGetProcAddress("glVertexAttribPointer");
glGetAttribLocation = (PFNGLGETATTRIBLOCATIONPROC)wglGetProcAddress("glGetAttribLocation");
glEnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC)wglGetProcAddress("glEnableVertexAttribArray");
glUseProgram = (PFNGLUSEPROGRAMPROC)wglGetProcAddress("glUseProgram");
glDeleteShader = (PFNGLDELETESHADERPROC)wglGetProcAddress("glDeleteShader");
glLinkProgram = (PFNGLLINKPROGRAMPROC)wglGetProcAddress("glLinkProgram");
glAttachShader = (PFNGLATTACHSHADERPROC)wglGetProcAddress("glAttachShader");
glCreateShader = (PFNGLCREATESHADERPROC)wglGetProcAddress("glCreateShader");
glCompileShader = (PFNGLCOMPILESHADERPROC)wglGetProcAddress("glCompileShader");
glCreateProgram = (PFNGLCREATEPROGRAMPROC)wglGetProcAddress("glCreateProgram");
glDeleteProgram = (PFNGLDELETEPROGRAMPROC)wglGetProcAddress("glDeleteProgram");
glUniform3f = (PFNGLUNIFORM3FPROC)wglGetProcAddress("glUniform3f");
glUniformMatrix4fv = (PFNGLUNIFORMMATRIX4FVPROC)wglGetProcAddress("glUniformMatrix4fv");
glUniform4f = (PFNGLUNIFORM4FPROC)wglGetProcAddress("glUniform4f");
glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)wglGetProcAddress("glGetUniformLocation");
glShaderSource = (PFNGLSHADERSOURCEPROC)wglGetProcAddress("glShaderSource");
#endif
glDrawBuffers = (PFNGLDRAWBUFFERSPROC)wglGetProcAddress("glDrawBuffers");
glBlendColor = (PFNGLBLENDCOLORPROC)wglGetProcAddress("glBlendColor");
#ifdef GL_ARB_framebuffer_object
glBindRenderbuffer = (PFNGLBINDRENDERBUFFERPROC)wglGetProcAddress("glBindRenderbuffer");
glCheckFramebufferStatus = (PFNGLCHECKFRAMEBUFFERSTATUSPROC)wglGetProcAddress("glCheckFramebufferStatus");
glFramebufferRenderbuffer = (PFNGLFRAMEBUFFERRENDERBUFFERPROC)wglGetProcAddress("glFramebufferRenderbuffer");
glRenderbufferStorage = (PFNGLRENDERBUFFERSTORAGEPROC)wglGetProcAddress("glRenderbufferStorage");
glBindFramebuffer = (PFNGLBINDFRAMEBUFFERPROC)wglGetProcAddress("glBindFramebuffer");
glGenFramebuffers = (PFNGLGENFRAMEBUFFERSPROC)wglGetProcAddress("glGenFramebuffers");
glGenRenderbuffers = (PFNGLGENRENDERBUFFERSPROC)wglGetProcAddress("glGenRenderbuffers");
glDeleteFramebuffers = (PFNGLDELETEFRAMEBUFFERSPROC)wglGetProcAddress("glDeleteFramebuffers");
glDeleteRenderbuffers = (PFNGLDELETERENDERBUFFERSPROC)wglGetProcAddress("glDeleteRenderbuffers");
#endif
#ifdef GL_EXT_framebuffer_object
glBindRenderbufferEXT = (PFNGLBINDRENDERBUFFEREXTPROC)wglGetProcAddress("glBindRenderbufferEXT");
glCheckFramebufferStatusEXT = (PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC)wglGetProcAddress("glCheckFramebufferStatusEXT");
glFramebufferRenderbufferEXT = (PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC)wglGetProcAddress("glFramebufferRenderbufferEXT");
glRenderbufferStorageEXT = (PFNGLRENDERBUFFERSTORAGEEXTPROC)wglGetProcAddress("glRenderbufferStorageEXT");
glBindFramebufferEXT = (PFNGLBINDFRAMEBUFFEREXTPROC)wglGetProcAddress("glBindFramebufferEXT");
glGenFramebuffersEXT = (PFNGLGENFRAMEBUFFERSEXTPROC)wglGetProcAddress("glGenFramebuffersEXT");
glGenRenderbuffersEXT = (PFNGLGENRENDERBUFFERSEXTPROC)wglGetProcAddress("glGenRenderbuffersEXT");
glDeleteFramebuffersEXT = (PFNGLDELETEFRAMEBUFFERSEXTPROC)wglGetProcAddress("glDeleteFramebuffersEXT");
glDeleteRenderbuffersEXT = (PFNGLDELETERENDERBUFFERSEXTPROC)wglGetProcAddress("glDeleteRenderbuffersEXT");
#endif
}
context_struct_.terminateGL = gr3_terminateGL_WIN_;
context_struct_.gl_is_initialized = 1;
gr3_appendtorenderpathstring_("Windows");
return GR3_ERROR_NONE;
}
struct platform *gr3_platform_initGL_dynamic_(void (*log_callback)(const char *),
void (*appendtorenderpathstring_callback)(const char *))
{
int major = 0, minor = 0;
int fbcount = 0;
GLXFBConfig *fbc;
GLXFBConfig fbconfig = (GLXFBConfig)NULL;
pbuffer = (GLXPbuffer)NULL;
gr3_log_ = log_callback;
gr3_appendtorenderpathstring_ = appendtorenderpathstring_callback;
gr3_log_("gr3_platform_initGL_dynamic_");
gr3_platform_.getProcAddress = (void (*(*)(const char *))()) & glXGetProcAddress;
display = XOpenDisplay(0);
if (!display)
{
gr3_log_("Not connected to an X server!");
return NULL;
}
if (!glXQueryExtension(display, NULL, NULL))
{
gr3_log_("GLX not supported!");
return NULL;
}
context = glXGetCurrentContext();
if (context != NULL)
{
gr3_appendtorenderpathstring_("GLX (existing context)");
}
else
{
/* call glXQueryVersion twice to prevent bugs in virtualbox */
if (!glXQueryVersion(display, &major, &minor) && !glXQueryVersion(display, &major, &minor))
{
return NULL;
}
if (major > 1 || minor >= 4)
{
int (*x_error_handler)() = _gr3_ignore_x_errors;
int i;
int fb_attribs[] = {GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT, GLX_RENDER_TYPE, GLX_RGBA_BIT, None};
int pbuffer_attribs[] = {GLX_PBUFFER_WIDTH, 1, GLX_PBUFFER_HEIGHT, 1, None};
gr3_log_("(Pbuffer)");
fbc = glXChooseFBConfig(display, DefaultScreen(display), fb_attribs, &fbcount);
if (fbcount == 0)
{
gr3_log_("failed to find a valid a GLX FBConfig for a RGBA PBuffer");
XFree(fbc);
XCloseDisplay(display);
return NULL;
}
/* Failed creation of a pbuffer may cause X errors, which we need to ignore */
XSynchronize(display, 1);
x_error_handler = XSetErrorHandler(_gr3_ignore_x_errors);
for (i = 0; i < fbcount && !pbuffer; i++)
{
fbconfig = fbc[i];
pbuffer = glXCreatePbuffer(display, fbconfig, pbuffer_attribs);
}
XSetErrorHandler(x_error_handler);
XSynchronize(display, 0);
XFree(fbc);
if (!pbuffer)
{
gr3_log_("failed to create a RGBA PBuffer");
XCloseDisplay(display);
return NULL;
}
context = glXCreateNewContext(display, fbconfig, GLX_RGBA_TYPE, None, True);
glXMakeContextCurrent(display, pbuffer, pbuffer, context);
gr3_platform_.terminateGL = &gr3_terminateGL_GLX_Pbuffer_;
gr3_appendtorenderpathstring_("GLX (Pbuffer)");
}
else
{
XVisualInfo *visual;
int fb_attribs[] = {GLX_DRAWABLE_TYPE, GLX_PIXMAP_BIT, GLX_RENDER_TYPE, GLX_RGBA_BIT, None};
gr3_log_("(XPixmap)");
fbc = glXChooseFBConfig(display, DefaultScreen(display), fb_attribs, &fbcount);
if (fbcount == 0)
{
gr3_log_("failed to find a valid a GLX FBConfig for a RGBA Pixmap");
XFree(fbc);
XCloseDisplay(display);
return NULL;
}
fbconfig = fbc[0];
XFree(fbc);
context = glXCreateNewContext(display, fbconfig, GLX_RGBA_TYPE, None, True);
visual = glXGetVisualFromFBConfig(display, fbconfig);
pixmap = XCreatePixmap(display, XRootWindow(display, DefaultScreen(display)), 1, 1, visual->depth);
if (glXMakeContextCurrent(display, pixmap, pixmap, context))
{
gr3_platform_.terminateGL = &gr3_terminateGL_GLX_Pixmap_;
gr3_appendtorenderpathstring_("GLX (XPixmap)");
}
else
{
gr3_log_("failed to make GLX OpenGL Context current with a Pixmap");
glXDestroyContext(display, context);
XFreePixmap(display, pixmap);
XCloseDisplay(display);
return NULL;
}
}
}
return &gr3_platform_;
}