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A multi-platform library for OpenGL, OpenGL ES, Vulkan, window and input
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glfw/src/x11_opengl.c

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//========================================================================
// GLFW - An OpenGL library
// Platform: X11/GLX
// API version: 3.0
// WWW: http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
#include "internal.h"
#include <string.h>
#include <stdlib.h>
// This is the only glXGetProcAddress variant not declared by glxext.h
void (*glXGetProcAddressEXT(const GLubyte* procName))();
//========================================================================
// Thread local storage attribute macro
//========================================================================
#if defined(__GNUC__)
#define _GLFW_TLS __thread
#else
#define _GLFW_TLS
#endif
//========================================================================
// The per-thread current context/window pointer
//========================================================================
static _GLFW_TLS _GLFWwindow* _glfwCurrentWindow = NULL;
//========================================================================
// Returns the specified attribute of the specified GLXFBConfig
// NOTE: Do not call this unless we have found GLX 1.3+ or GLX_SGIX_fbconfig
//========================================================================
static int getFBConfigAttrib(_GLFWwindow* window, GLXFBConfig fbconfig, int attrib)
{
int value;
if (_glfwLibrary.GLX.SGIX_fbconfig)
{
_glfwLibrary.GLX.GetFBConfigAttribSGIX(_glfwLibrary.X11.display,
fbconfig, attrib, &value);
}
else
glXGetFBConfigAttrib(_glfwLibrary.X11.display, fbconfig, attrib, &value);
return value;
}
//========================================================================
// Return a list of available and usable framebuffer configs
//========================================================================
static _GLFWfbconfig* getFBConfigs(_GLFWwindow* window, unsigned int* found)
{
GLXFBConfig* fbconfigs;
_GLFWfbconfig* result;
int i, count = 0;
const char* vendor;
GLboolean trustWindowBit = GL_TRUE;
*found = 0;
if (_glfwLibrary.GLX.majorVersion == 1 && _glfwLibrary.GLX.minorVersion < 3)
{
if (!_glfwLibrary.GLX.SGIX_fbconfig)
{
_glfwSetError(GLFW_OPENGL_UNAVAILABLE,
"GLX: GLXFBConfig support not found");
return NULL;
}
}
vendor = glXGetClientString(_glfwLibrary.X11.display, GLX_VENDOR);
if (strcmp(vendor, "Chromium") == 0)
{
// This is a (hopefully temporary) workaround for Chromium (VirtualBox
// GL) not setting the window bit on any GLXFBConfigs
trustWindowBit = GL_FALSE;
}
if (_glfwLibrary.GLX.SGIX_fbconfig)
{
fbconfigs = _glfwLibrary.GLX.ChooseFBConfigSGIX(_glfwLibrary.X11.display,
_glfwLibrary.X11.screen,
NULL,
&count);
if (!count)
{
_glfwSetError(GLFW_OPENGL_UNAVAILABLE,
"GLX: No GLXFBConfigs returned");
return NULL;
}
}
else
{
fbconfigs = glXGetFBConfigs(_glfwLibrary.X11.display,
_glfwLibrary.X11.screen,
&count);
if (!count)
{
_glfwSetError(GLFW_OPENGL_UNAVAILABLE,
"GLX: No GLXFBConfigs returned");
return NULL;
}
}
result = (_GLFWfbconfig*) malloc(sizeof(_GLFWfbconfig) * count);
if (!result)
{
_glfwSetError(GLFW_OUT_OF_MEMORY, NULL);
return NULL;
}
for (i = 0; i < count; i++)
{
_GLFWfbconfig* f = result + *found;
if (!getFBConfigAttrib(window, fbconfigs[i], GLX_DOUBLEBUFFER) ||
!getFBConfigAttrib(window, fbconfigs[i], GLX_VISUAL_ID))
{
// Only consider double-buffered GLXFBConfigs with associated visuals
continue;
}
if (!(getFBConfigAttrib(window,
fbconfigs[i],
GLX_RENDER_TYPE) & GLX_RGBA_BIT))
{
// Only consider RGBA GLXFBConfigs
continue;
}
if (!(getFBConfigAttrib(window, fbconfigs[i], GLX_DRAWABLE_TYPE) & GLX_WINDOW_BIT))
{
if (trustWindowBit)
{
// Only consider window GLXFBConfigs
continue;
}
}
f->redBits = getFBConfigAttrib(window, fbconfigs[i], GLX_RED_SIZE);
f->greenBits = getFBConfigAttrib(window, fbconfigs[i], GLX_GREEN_SIZE);
f->blueBits = getFBConfigAttrib(window, fbconfigs[i], GLX_BLUE_SIZE);
f->alphaBits = getFBConfigAttrib(window, fbconfigs[i], GLX_ALPHA_SIZE);
f->depthBits = getFBConfigAttrib(window, fbconfigs[i], GLX_DEPTH_SIZE);
f->stencilBits = getFBConfigAttrib(window, fbconfigs[i], GLX_STENCIL_SIZE);
f->accumRedBits = getFBConfigAttrib(window, fbconfigs[i], GLX_ACCUM_RED_SIZE);
f->accumGreenBits = getFBConfigAttrib(window, fbconfigs[i], GLX_ACCUM_GREEN_SIZE);
f->accumBlueBits = getFBConfigAttrib(window, fbconfigs[i], GLX_ACCUM_BLUE_SIZE);
f->accumAlphaBits = getFBConfigAttrib(window, fbconfigs[i], GLX_ACCUM_ALPHA_SIZE);
f->auxBuffers = getFBConfigAttrib(window, fbconfigs[i], GLX_AUX_BUFFERS);
f->stereo = getFBConfigAttrib(window, fbconfigs[i], GLX_STEREO);
if (_glfwLibrary.GLX.ARB_multisample)
f->samples = getFBConfigAttrib(window, fbconfigs[i], GLX_SAMPLES);
else
f->samples = 0;
f->platformID = (GLFWintptr) getFBConfigAttrib(window, fbconfigs[i], GLX_FBCONFIG_ID);
(*found)++;
}
XFree(fbconfigs);
return result;
}
//========================================================================
// Error handler for BadMatch errors when requesting context with
// unavailable OpenGL versions using the GLX_ARB_create_context extension
//========================================================================
static int errorHandler(Display *display, XErrorEvent* event)
{
return 0;
}
//========================================================================
// Create the actual OpenGL context
//========================================================================
#define setGLXattrib(attribs, index, attribName, attribValue) \
attribs[index++] = attribName; \
attribs[index++] = attribValue;
static int createContext(_GLFWwindow* window,
const _GLFWwndconfig* wndconfig,
GLXFBConfigID fbconfigID)
{
int attribs[40];
int dummy, index;
GLXFBConfig* fbconfig;
GLXContext share = NULL;
if (wndconfig->share)
share = wndconfig->share->GLX.context;
// Retrieve the previously selected GLXFBConfig
{
index = 0;
setGLXattrib(attribs, index, GLX_FBCONFIG_ID, (int) fbconfigID);
setGLXattrib(attribs, index, None, None);
if (_glfwLibrary.GLX.SGIX_fbconfig)
{
fbconfig = _glfwLibrary.GLX.ChooseFBConfigSGIX(_glfwLibrary.X11.display,
_glfwLibrary.X11.screen,
attribs,
&dummy);
}
else
{
fbconfig = glXChooseFBConfig(_glfwLibrary.X11.display,
_glfwLibrary.X11.screen,
attribs,
&dummy);
}
if (fbconfig == NULL)
{
_glfwSetError(GLFW_PLATFORM_ERROR,
"GLX: Failed to retrieve the selected GLXFBConfig");
return GL_FALSE;
}
}
// Retrieve the corresponding visual
if (_glfwLibrary.GLX.SGIX_fbconfig)
{
window->GLX.visual = _glfwLibrary.GLX.GetVisualFromFBConfigSGIX(_glfwLibrary.X11.display,
*fbconfig);
}
else
{
window->GLX.visual = glXGetVisualFromFBConfig(_glfwLibrary.X11.display,
*fbconfig);
}
if (window->GLX.visual == NULL)
{
XFree(fbconfig);
_glfwSetError(GLFW_PLATFORM_ERROR,
"GLX: Failed to retrieve visual for GLXFBConfig");
return GL_FALSE;
}
if (_glfwLibrary.GLX.ARB_create_context)
{
index = 0;
if (wndconfig->glMajor != 1 || wndconfig->glMinor != 0)
{
// Request an explicitly versioned context
setGLXattrib(attribs, index, GLX_CONTEXT_MAJOR_VERSION_ARB, wndconfig->glMajor);
setGLXattrib(attribs, index, GLX_CONTEXT_MINOR_VERSION_ARB, wndconfig->glMinor);
}
if (wndconfig->glForward || wndconfig->glDebug || wndconfig->glRobustness)
{
int flags = 0;
if (wndconfig->glForward)
flags |= GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
if (wndconfig->glDebug)
flags |= GLX_CONTEXT_DEBUG_BIT_ARB;
if (wndconfig->glRobustness)
flags |= GLX_CONTEXT_ROBUST_ACCESS_BIT_ARB;
setGLXattrib(attribs, index, GLX_CONTEXT_FLAGS_ARB, flags);
}
if (wndconfig->glProfile)
{
int flags = 0;
if (!_glfwLibrary.GLX.ARB_create_context_profile)
{
_glfwSetError(GLFW_VERSION_UNAVAILABLE,
"GLX: An OpenGL profile requested but "
"GLX_ARB_create_context_profile is unavailable");
return GL_FALSE;
}
if (wndconfig->glProfile == GLFW_OPENGL_ES2_PROFILE &&
!_glfwLibrary.GLX.EXT_create_context_es2_profile)
{
_glfwSetError(GLFW_VERSION_UNAVAILABLE,
"GLX: OpenGL ES 2.x profile requested but "
"GLX_EXT_create_context_es2_profile is unavailable");
return GL_FALSE;
}
if (wndconfig->glProfile == GLFW_OPENGL_CORE_PROFILE)
flags = GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
else if (wndconfig->glProfile == GLFW_OPENGL_COMPAT_PROFILE)
flags = GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
else if (wndconfig->glProfile == GLFW_OPENGL_ES2_PROFILE)
flags = GLX_CONTEXT_ES2_PROFILE_BIT_EXT;
setGLXattrib(attribs, index, GLX_CONTEXT_PROFILE_MASK_ARB, flags);
}
if (wndconfig->glRobustness)
{
int strategy;
if (!_glfwLibrary.GLX.ARB_create_context_robustness)
{
_glfwSetError(GLFW_VERSION_UNAVAILABLE,
"GLX: An OpenGL robustness strategy was "
"requested but GLX_ARB_create_context_robustness "
"is unavailable");
return GL_FALSE;
}
if (wndconfig->glRobustness == GLFW_OPENGL_NO_RESET_NOTIFICATION)
strategy = GLX_NO_RESET_NOTIFICATION_ARB;
else if (wndconfig->glRobustness == GLFW_OPENGL_LOSE_CONTEXT_ON_RESET)
strategy = GLX_LOSE_CONTEXT_ON_RESET_ARB;
setGLXattrib(attribs,
index,
GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB,
strategy);
}
setGLXattrib(attribs, index, None, None);
// This is the only place we set an Xlib error handler, and we only do
// it because glXCreateContextAttribsARB generates a BadMatch error if
// the requested OpenGL version is unavailable (instead of a civilized
// response like returning NULL)
XSetErrorHandler(errorHandler);
window->GLX.context =
_glfwLibrary.GLX.CreateContextAttribsARB(_glfwLibrary.X11.display,
*fbconfig,
share,
True,
attribs);
// We are done, so unset the error handler again (see above)
XSetErrorHandler(NULL);
}
else
{
if (_glfwLibrary.GLX.SGIX_fbconfig)
{
window->GLX.context =
_glfwLibrary.GLX.CreateContextWithConfigSGIX(_glfwLibrary.X11.display,
*fbconfig,
GLX_RGBA_TYPE,
share,
True);
}
else
{
window->GLX.context = glXCreateNewContext(_glfwLibrary.X11.display,
*fbconfig,
GLX_RGBA_TYPE,
share,
True);
}
}
XFree(fbconfig);
if (window->GLX.context == NULL)
{
// TODO: Handle all the various error codes here
_glfwSetError(GLFW_PLATFORM_ERROR,
"GLX: Failed to create OpenGL context");
return GL_FALSE;
}
return GL_TRUE;
}
#undef setGLXattrib
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
//========================================================================
// Initialize GLX
//========================================================================
int _glfwInitOpenGL(void)
{
#ifdef _GLFW_DLOPEN_LIBGL
int i;
char* libGL_names[ ] =
{
"libGL.so",
"libGL.so.1",
"/usr/lib/libGL.so",
"/usr/lib/libGL.so.1",
NULL
};
for (i = 0; libGL_names[i] != NULL; i++)
{
_glfwLibrary.GLX.libGL = dlopen(libGL_names[i], RTLD_LAZY | RTLD_GLOBAL);
if (_glfwLibrary.GLX.libGL)
break;
}
if (!_glfwLibrary.GLX.libGL)
{
_glfwSetError(GLFW_PLATFORM_ERROR, "GLX: Failed to find libGL");
return GL_FALSE;
}
#endif
// Check if GLX is supported on this display
if (!glXQueryExtension(_glfwLibrary.X11.display, NULL, NULL))
{
_glfwSetError(GLFW_OPENGL_UNAVAILABLE, "GLX: GLX support not found");
return GL_FALSE;
}
if (!glXQueryVersion(_glfwLibrary.X11.display,
&_glfwLibrary.GLX.majorVersion,
&_glfwLibrary.GLX.minorVersion))
{
_glfwSetError(GLFW_OPENGL_UNAVAILABLE,
"GLX: Failed to query GLX version");
return GL_FALSE;
}
if (_glfwPlatformExtensionSupported("GLX_EXT_swap_control"))
{
_glfwLibrary.GLX.SwapIntervalEXT = (PFNGLXSWAPINTERVALEXTPROC)
_glfwPlatformGetProcAddress("glXSwapIntervalEXT");
if (_glfwLibrary.GLX.SwapIntervalEXT)
_glfwLibrary.GLX.EXT_swap_control = GL_TRUE;
}
if (_glfwPlatformExtensionSupported("GLX_SGI_swap_control"))
{
_glfwLibrary.GLX.SwapIntervalSGI = (PFNGLXSWAPINTERVALSGIPROC)
_glfwPlatformGetProcAddress("glXSwapIntervalSGI");
if (_glfwLibrary.GLX.SwapIntervalSGI)
_glfwLibrary.GLX.SGI_swap_control = GL_TRUE;
}
if (_glfwPlatformExtensionSupported("GLX_MESA_swap_control"))
{
_glfwLibrary.GLX.SwapIntervalMESA = (PFNGLXSWAPINTERVALMESAPROC)
_glfwPlatformGetProcAddress("glXSwapIntervalMESA");
if (_glfwLibrary.GLX.SwapIntervalMESA)
_glfwLibrary.GLX.MESA_swap_control = GL_TRUE;
}
if (_glfwPlatformExtensionSupported("GLX_SGIX_fbconfig"))
{
_glfwLibrary.GLX.GetFBConfigAttribSGIX = (PFNGLXGETFBCONFIGATTRIBSGIXPROC)
_glfwPlatformGetProcAddress("glXGetFBConfigAttribSGIX");
_glfwLibrary.GLX.ChooseFBConfigSGIX = (PFNGLXCHOOSEFBCONFIGSGIXPROC)
_glfwPlatformGetProcAddress("glXChooseFBConfigSGIX");
_glfwLibrary.GLX.CreateContextWithConfigSGIX = (PFNGLXCREATECONTEXTWITHCONFIGSGIXPROC)
_glfwPlatformGetProcAddress("glXCreateContextWithConfigSGIX");
_glfwLibrary.GLX.GetVisualFromFBConfigSGIX = (PFNGLXGETVISUALFROMFBCONFIGSGIXPROC)
_glfwPlatformGetProcAddress("glXGetVisualFromFBConfigSGIX");
if (_glfwLibrary.GLX.GetFBConfigAttribSGIX &&
_glfwLibrary.GLX.ChooseFBConfigSGIX &&
_glfwLibrary.GLX.CreateContextWithConfigSGIX &&
_glfwLibrary.GLX.GetVisualFromFBConfigSGIX)
{
_glfwLibrary.GLX.SGIX_fbconfig = GL_TRUE;
}
}
if (_glfwPlatformExtensionSupported("GLX_ARB_multisample"))
_glfwLibrary.GLX.ARB_multisample = GL_TRUE;
if (_glfwPlatformExtensionSupported("GLX_ARB_create_context"))
{
_glfwLibrary.GLX.CreateContextAttribsARB = (PFNGLXCREATECONTEXTATTRIBSARBPROC)
_glfwPlatformGetProcAddress("glXCreateContextAttribsARB");
if (_glfwLibrary.GLX.CreateContextAttribsARB)
_glfwLibrary.GLX.ARB_create_context = GL_TRUE;
}
if (_glfwPlatformExtensionSupported("GLX_ARB_create_context_robustness"))
_glfwLibrary.GLX.ARB_create_context_robustness = GL_TRUE;
if (_glfwPlatformExtensionSupported("GLX_ARB_create_context_profile"))
_glfwLibrary.GLX.ARB_create_context_profile = GL_TRUE;
if (_glfwPlatformExtensionSupported("GLX_EXT_create_context_es2_profile"))
_glfwLibrary.GLX.EXT_create_context_es2_profile = GL_TRUE;
return GL_TRUE;
}
//========================================================================
// Terminate GLX
//========================================================================
void _glfwTerminateOpenGL(void)
{
// Unload libGL.so if necessary
#ifdef _GLFW_DLOPEN_LIBGL
if (_glfwLibrary.GLX.libGL != NULL)
{
dlclose(_glfwLibrary.GLX.libGL);
_glfwLibrary.GLX.libGL = NULL;
}
#endif
}
//========================================================================
// Prepare for creation of the OpenGL context
//========================================================================
int _glfwCreateContext(_GLFWwindow* window,
const _GLFWwndconfig* wndconfig,
const _GLFWfbconfig* fbconfig)
{
_GLFWfbconfig closest;
// Choose the best available fbconfig
{
unsigned int fbcount;
_GLFWfbconfig* fbconfigs;
const _GLFWfbconfig* result;
fbconfigs = getFBConfigs(window, &fbcount);
if (!fbconfigs)
return GL_FALSE;
result = _glfwChooseFBConfig(fbconfig, fbconfigs, fbcount);
if (!result)
{
_glfwSetError(GLFW_PLATFORM_ERROR,
"GLX: No GLXFBConfig matched the criteria");
free(fbconfigs);
return GL_FALSE;
}
closest = *result;
free(fbconfigs);
}
return createContext(window, wndconfig, closest.platformID);
}
//========================================================================
// Destroy the OpenGL context
//========================================================================
void _glfwDestroyContext(_GLFWwindow* window)
{
if (window->GLX.visual)
{
XFree(window->GLX.visual);
window->GLX.visual = NULL;
}
if (window->GLX.context)
{
// Release and destroy the context
glXMakeCurrent(_glfwLibrary.X11.display, None, NULL);
glXDestroyContext(_glfwLibrary.X11.display, window->GLX.context);
window->GLX.context = NULL;
}
}
//========================================================================
// Return the X visual associated with the specified context
//========================================================================
XVisualInfo* _glfwGetContextVisual(_GLFWwindow* window)
{
return window->GLX.visual;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW platform API //////
//////////////////////////////////////////////////////////////////////////
//========================================================================
// Make the OpenGL context associated with the specified window current
//========================================================================
void _glfwPlatformMakeContextCurrent(_GLFWwindow* window)
{
if (window)
{
glXMakeCurrent(_glfwLibrary.X11.display,
window->X11.handle,
window->GLX.context);
}
else
glXMakeCurrent(_glfwLibrary.X11.display, None, NULL);
_glfwCurrentWindow = window;
}
//========================================================================
// Return the window object whose context is current
//========================================================================
_GLFWwindow* _glfwPlatformGetCurrentContext(void)
{
return _glfwCurrentWindow;
}
//========================================================================
// Swap OpenGL buffers
//========================================================================
void _glfwPlatformSwapBuffers(_GLFWwindow* window)
{
glXSwapBuffers(_glfwLibrary.X11.display, window->X11.handle);
}
//========================================================================
// Set double buffering swap interval
//========================================================================
void _glfwPlatformSwapInterval(int interval)
{
_GLFWwindow* window = _glfwCurrentWindow;
if (_glfwLibrary.GLX.EXT_swap_control)
{
_glfwLibrary.GLX.SwapIntervalEXT(_glfwLibrary.X11.display,
window->X11.handle,
interval);
}
else if (_glfwLibrary.GLX.MESA_swap_control)
_glfwLibrary.GLX.SwapIntervalMESA(interval);
else if (_glfwLibrary.GLX.SGI_swap_control)
{
if (interval > 0)
_glfwLibrary.GLX.SwapIntervalSGI(interval);
}
}
//========================================================================
// Check if an OpenGL extension is available at runtime
//========================================================================
int _glfwPlatformExtensionSupported(const char* extension)
{
const GLubyte* extensions;
// Get list of GLX extensions
extensions = (const GLubyte*) glXQueryExtensionsString(_glfwLibrary.X11.display,
_glfwLibrary.X11.screen);
if (extensions != NULL)
{
if (_glfwStringInExtensionString(extension, extensions))
return GL_TRUE;
}
return GL_FALSE;
}
//========================================================================
// Get the function pointer to an OpenGL function
//========================================================================
GLFWglproc _glfwPlatformGetProcAddress(const char* procname)
{
return _glfw_glXGetProcAddress((const GLubyte*) procname);
}
//========================================================================
// Copies the specified OpenGL state categories from src to dst
//========================================================================
void _glfwPlatformCopyContext(_GLFWwindow* src, _GLFWwindow* dst, unsigned long mask)
{
glXCopyContext(_glfwLibrary.X11.display,
src->GLX.context,
dst->GLX.context,
mask);
}