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glfw/src/glx_context.c
Camilla Berglund 719b60dd2b Added macros for library initialization check.
2013-02-20 18:15:03 +01:00

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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>
#include <assert.h>
// This is the only glXGetProcAddress variant not declared by glxext.h
void (*glXGetProcAddressEXT(const GLubyte* procName))();
#ifndef GLXBadProfileARB
#define GLXBadProfileARB 13
#endif
// Thread local storage attribute macro
//
#if defined(__GNUC__)
#define _GLFW_TLS __thread
#else
#define _GLFW_TLS
#endif
// The X error code as provided to the X error handler
//
static unsigned long _glfwErrorCode = Success;
// The per-thread current context/window pointer
//
static _GLFW_TLS _GLFWwindow* _glfwCurrentWindow = NULL;
// Error handler used when creating a context
//
static int errorHandler(Display *display, XErrorEvent* event)
{
_glfwErrorCode = event->error_code;
return 0;
}
// Create the OpenGL context using legacy API
//
static GLXContext createLegacyContext(_GLFWwindow* window,
GLXFBConfig fbconfig,
GLXContext share)
{
if (_glfw.glx.SGIX_fbconfig)
{
return _glfw.glx.CreateContextWithConfigSGIX(_glfw.x11.display,
fbconfig,
GLX_RGBA_TYPE,
share,
True);
}
else
{
return glXCreateNewContext(_glfw.x11.display,
fbconfig,
GLX_RGBA_TYPE,
share,
True);
}
}
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
// Initialize GLX
//
int _glfwInitContextAPI(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++)
{
_glfw.glx.libGL = dlopen(libGL_names[i], RTLD_LAZY | RTLD_GLOBAL);
if (_glfw.glx.libGL)
break;
}
if (!_glfw.glx.libGL)
{
_glfwInputError(GLFW_PLATFORM_ERROR, "GLX: Failed to find libGL");
return GL_FALSE;
}
#endif
// Check if GLX is supported on this display
if (!glXQueryExtension(_glfw.x11.display,
&_glfw.glx.errorBase,
&_glfw.glx.eventBase))
{
_glfwInputError(GLFW_API_UNAVAILABLE, "GLX: GLX support not found");
return GL_FALSE;
}
if (!glXQueryVersion(_glfw.x11.display,
&_glfw.glx.versionMajor,
&_glfw.glx.versionMinor))
{
_glfwInputError(GLFW_API_UNAVAILABLE,
"GLX: Failed to query GLX version");
return GL_FALSE;
}
if (_glfwPlatformExtensionSupported("GLX_EXT_swap_control"))
{
_glfw.glx.SwapIntervalEXT = (PFNGLXSWAPINTERVALEXTPROC)
_glfwPlatformGetProcAddress("glXSwapIntervalEXT");
if (_glfw.glx.SwapIntervalEXT)
_glfw.glx.EXT_swap_control = GL_TRUE;
}
if (_glfwPlatformExtensionSupported("GLX_SGI_swap_control"))
{
_glfw.glx.SwapIntervalSGI = (PFNGLXSWAPINTERVALSGIPROC)
_glfwPlatformGetProcAddress("glXSwapIntervalSGI");
if (_glfw.glx.SwapIntervalSGI)
_glfw.glx.SGI_swap_control = GL_TRUE;
}
if (_glfwPlatformExtensionSupported("GLX_MESA_swap_control"))
{
_glfw.glx.SwapIntervalMESA = (PFNGLXSWAPINTERVALMESAPROC)
_glfwPlatformGetProcAddress("glXSwapIntervalMESA");
if (_glfw.glx.SwapIntervalMESA)
_glfw.glx.MESA_swap_control = GL_TRUE;
}
if (_glfwPlatformExtensionSupported("GLX_SGIX_fbconfig"))
{
_glfw.glx.GetFBConfigAttribSGIX = (PFNGLXGETFBCONFIGATTRIBSGIXPROC)
_glfwPlatformGetProcAddress("glXGetFBConfigAttribSGIX");
_glfw.glx.ChooseFBConfigSGIX = (PFNGLXCHOOSEFBCONFIGSGIXPROC)
_glfwPlatformGetProcAddress("glXChooseFBConfigSGIX");
_glfw.glx.CreateContextWithConfigSGIX = (PFNGLXCREATECONTEXTWITHCONFIGSGIXPROC)
_glfwPlatformGetProcAddress("glXCreateContextWithConfigSGIX");
_glfw.glx.GetVisualFromFBConfigSGIX = (PFNGLXGETVISUALFROMFBCONFIGSGIXPROC)
_glfwPlatformGetProcAddress("glXGetVisualFromFBConfigSGIX");
if (_glfw.glx.GetFBConfigAttribSGIX &&
_glfw.glx.ChooseFBConfigSGIX &&
_glfw.glx.CreateContextWithConfigSGIX &&
_glfw.glx.GetVisualFromFBConfigSGIX)
{
_glfw.glx.SGIX_fbconfig = GL_TRUE;
}
}
if (_glfwPlatformExtensionSupported("GLX_ARB_multisample"))
_glfw.glx.ARB_multisample = GL_TRUE;
if (_glfwPlatformExtensionSupported("GLX_ARB_framebuffer_sRGB"))
_glfw.glx.ARB_framebuffer_sRGB = GL_TRUE;
if (_glfwPlatformExtensionSupported("GLX_ARB_create_context"))
{
_glfw.glx.CreateContextAttribsARB = (PFNGLXCREATECONTEXTATTRIBSARBPROC)
_glfwPlatformGetProcAddress("glXCreateContextAttribsARB");
if (_glfw.glx.CreateContextAttribsARB)
_glfw.glx.ARB_create_context = GL_TRUE;
}
if (_glfwPlatformExtensionSupported("GLX_ARB_create_context_robustness"))
_glfw.glx.ARB_create_context_robustness = GL_TRUE;
if (_glfwPlatformExtensionSupported("GLX_ARB_create_context_profile"))
_glfw.glx.ARB_create_context_profile = GL_TRUE;
if (_glfwPlatformExtensionSupported("GLX_EXT_create_context_es2_profile"))
_glfw.glx.EXT_create_context_es2_profile = GL_TRUE;
return GL_TRUE;
}
// Terminate GLX
//
void _glfwTerminateContextAPI(void)
{
// Unload libGL.so if necessary
#ifdef _GLFW_DLOPEN_LIBGL
if (_glfw.glx.libGL != NULL)
{
dlclose(_glfw.glx.libGL);
_glfw.glx.libGL = NULL;
}
#endif
}
#define setGLXattrib(attribName, attribValue) \
{ \
attribs[index++] = attribName; \
attribs[index++] = attribValue; \
assert(index < sizeof(attribs) / sizeof(attribs[0])); \
}
// Prepare for creation of the OpenGL context
//
int _glfwCreateContext(_GLFWwindow* window,
const _GLFWwndconfig* wndconfig,
const _GLFWfbconfig* fbconfig)
{
int attribs[40];
GLXFBConfig* native;
GLXContext share = NULL;
if (wndconfig->share)
share = wndconfig->share->glx.context;
// Find a suitable GLXFBConfig
{
int count, index = 0;
setGLXattrib(GLX_DOUBLEBUFFER, True);
setGLXattrib(GLX_X_RENDERABLE, True);
if (fbconfig->redBits)
setGLXattrib(GLX_RED_SIZE, fbconfig->redBits);
if (fbconfig->greenBits)
setGLXattrib(GLX_GREEN_SIZE, fbconfig->greenBits);
if (fbconfig->blueBits)
setGLXattrib(GLX_BLUE_SIZE, fbconfig->blueBits);
if (fbconfig->alphaBits)
setGLXattrib(GLX_ALPHA_SIZE, fbconfig->alphaBits);
if (fbconfig->depthBits)
setGLXattrib(GLX_DEPTH_SIZE, fbconfig->depthBits);
if (fbconfig->stencilBits)
setGLXattrib(GLX_STENCIL_SIZE, fbconfig->stencilBits);
if (fbconfig->auxBuffers)
setGLXattrib(GLX_AUX_BUFFERS, fbconfig->auxBuffers);
if (fbconfig->accumRedBits)
setGLXattrib(GLX_ACCUM_RED_SIZE, fbconfig->accumRedBits);
if (fbconfig->accumGreenBits)
setGLXattrib(GLX_ACCUM_GREEN_SIZE, fbconfig->accumGreenBits);
if (fbconfig->accumBlueBits)
setGLXattrib(GLX_ACCUM_BLUE_SIZE, fbconfig->accumBlueBits);
if (fbconfig->accumAlphaBits)
setGLXattrib(GLX_ACCUM_BLUE_SIZE, fbconfig->accumAlphaBits);
if (fbconfig->stereo)
setGLXattrib(GLX_STEREO, True);
if (_glfw.glx.ARB_multisample)
{
if (fbconfig->samples)
{
setGLXattrib(GLX_SAMPLE_BUFFERS_ARB, 1);
setGLXattrib(GLX_SAMPLES_ARB, fbconfig->samples);
}
}
if (_glfw.glx.ARB_framebuffer_sRGB)
{
if (fbconfig->sRGB)
setGLXattrib(GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB, True);
}
setGLXattrib(None, None);
if (_glfw.glx.SGIX_fbconfig)
{
native = _glfw.glx.ChooseFBConfigSGIX(_glfw.x11.display,
_glfw.x11.screen,
attribs,
&count);
}
else
{
native = glXChooseFBConfig(_glfw.x11.display,
_glfw.x11.screen,
attribs,
&count);
}
if (native == NULL)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"GLX: Failed to find a suitable GLXFBConfig");
return GL_FALSE;
}
}
// Retrieve the corresponding visual
if (_glfw.glx.SGIX_fbconfig)
{
window->glx.visual =
_glfw.glx.GetVisualFromFBConfigSGIX(_glfw.x11.display, *native);
}
else
{
window->glx.visual = glXGetVisualFromFBConfig(_glfw.x11.display,
*native);
}
if (window->glx.visual == NULL)
{
XFree(native);
_glfwInputError(GLFW_PLATFORM_ERROR,
"GLX: Failed to retrieve visual for GLXFBConfig");
return GL_FALSE;
}
if (wndconfig->clientAPI == GLFW_OPENGL_ES_API)
{
if (!_glfw.glx.ARB_create_context ||
!_glfw.glx.ARB_create_context_profile ||
!_glfw.glx.EXT_create_context_es2_profile)
{
XFree(native);
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"GLX: OpenGL ES requested but "
"GLX_EXT_create_context_es2_profile is unavailable");
return GL_FALSE;
}
}
if (wndconfig->glForward)
{
if (!_glfw.glx.ARB_create_context)
{
XFree(native);
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"GLX: Forward compatibility requested but "
"GLX_ARB_create_context_profile is unavailable");
return GL_FALSE;
}
}
if (wndconfig->glProfile)
{
if (!_glfw.glx.ARB_create_context ||
!_glfw.glx.ARB_create_context_profile)
{
XFree(native);
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"GLX: An OpenGL profile requested but "
"GLX_ARB_create_context_profile is unavailable");
return GL_FALSE;
}
}
_glfwErrorCode = Success;
XSetErrorHandler(errorHandler);
if (_glfw.glx.ARB_create_context)
{
int index = 0, mask = 0, flags = 0, strategy = 0;
if (wndconfig->clientAPI == GLFW_OPENGL_API)
{
if (wndconfig->glForward)
flags |= GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
if (wndconfig->glDebug)
flags |= GLX_CONTEXT_DEBUG_BIT_ARB;
if (wndconfig->glProfile)
{
if (wndconfig->glProfile == GLFW_OPENGL_CORE_PROFILE)
mask |= GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
else if (wndconfig->glProfile == GLFW_OPENGL_COMPAT_PROFILE)
mask |= GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
}
}
else
mask |= GLX_CONTEXT_ES2_PROFILE_BIT_EXT;
if (wndconfig->glRobustness != GLFW_NO_ROBUSTNESS)
{
if (_glfw.glx.ARB_create_context_robustness)
{
if (wndconfig->glRobustness == GLFW_NO_RESET_NOTIFICATION)
strategy = GLX_NO_RESET_NOTIFICATION_ARB;
else if (wndconfig->glRobustness == GLFW_LOSE_CONTEXT_ON_RESET)
strategy = GLX_LOSE_CONTEXT_ON_RESET_ARB;
flags |= GLX_CONTEXT_ROBUST_ACCESS_BIT_ARB;
}
}
if (wndconfig->glMajor != 1 || wndconfig->glMinor != 0)
{
// NOTE: Only request an explicitly versioned context when
// necessary, as explicitly requesting version 1.0 does not always
// return the highest available version
setGLXattrib(GLX_CONTEXT_MAJOR_VERSION_ARB, wndconfig->glMajor);
setGLXattrib(GLX_CONTEXT_MINOR_VERSION_ARB, wndconfig->glMinor);
}
if (mask)
setGLXattrib(GLX_CONTEXT_PROFILE_MASK_ARB, mask);
if (flags)
setGLXattrib(GLX_CONTEXT_FLAGS_ARB, flags);
if (strategy)
setGLXattrib(GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB, strategy);
setGLXattrib(None, None);
window->glx.context =
_glfw.glx.CreateContextAttribsARB(_glfw.x11.display,
*native,
share,
True,
attribs);
if (window->glx.context == NULL)
{
// HACK: This is a fallback for the broken Mesa implementation of
// GLX_ARB_create_context_profile, which fails default 1.0 context
// creation with a GLXBadProfileARB error in violation of the spec
if (_glfwErrorCode == _glfw.glx.errorBase + GLXBadProfileARB &&
wndconfig->clientAPI == GLFW_OPENGL_API &&
wndconfig->glProfile == GLFW_OPENGL_NO_PROFILE &&
wndconfig->glForward == GL_FALSE)
{
window->glx.context = createLegacyContext(window, *native, share);
}
}
}
else
window->glx.context = createLegacyContext(window, *native, share);
XSetErrorHandler(NULL);
XFree(native);
if (window->glx.context == NULL)
{
char buffer[8192];
XGetErrorText(_glfw.x11.display,
_glfwErrorCode,
buffer, sizeof(buffer));
_glfwInputError(GLFW_PLATFORM_ERROR,
"GLX: Failed to create context: %s",
buffer);
return GL_FALSE;
}
return GL_TRUE;
}
#undef setGLXattrib
// Destroy the OpenGL context
//
void _glfwDestroyContext(_GLFWwindow* window)
{
if (window->glx.visual)
{
XFree(window->glx.visual);
window->glx.visual = NULL;
}
if (window->glx.context)
{
glXDestroyContext(_glfw.x11.display, window->glx.context);
window->glx.context = NULL;
}
}
//////////////////////////////////////////////////////////////////////////
////// GLFW platform API //////
//////////////////////////////////////////////////////////////////////////
void _glfwPlatformMakeContextCurrent(_GLFWwindow* window)
{
if (window)
{
glXMakeCurrent(_glfw.x11.display,
window->x11.handle,
window->glx.context);
}
else
glXMakeCurrent(_glfw.x11.display, None, NULL);
_glfwCurrentWindow = window;
}
_GLFWwindow* _glfwPlatformGetCurrentContext(void)
{
return _glfwCurrentWindow;
}
void _glfwPlatformSwapBuffers(_GLFWwindow* window)
{
glXSwapBuffers(_glfw.x11.display, window->x11.handle);
}
void _glfwPlatformSwapInterval(int interval)
{
_GLFWwindow* window = _glfwCurrentWindow;
if (_glfw.glx.EXT_swap_control)
{
_glfw.glx.SwapIntervalEXT(_glfw.x11.display,
window->x11.handle,
interval);
}
else if (_glfw.glx.MESA_swap_control)
_glfw.glx.SwapIntervalMESA(interval);
else if (_glfw.glx.SGI_swap_control)
{
if (interval > 0)
_glfw.glx.SwapIntervalSGI(interval);
}
}
int _glfwPlatformExtensionSupported(const char* extension)
{
const GLubyte* extensions;
// Get list of GLX extensions
extensions = (const GLubyte*) glXQueryExtensionsString(_glfw.x11.display,
_glfw.x11.screen);
if (extensions != NULL)
{
if (_glfwStringInExtensionString(extension, extensions))
return GL_TRUE;
}
return GL_FALSE;
}
GLFWglproc _glfwPlatformGetProcAddress(const char* procname)
{
return _glfw_glXGetProcAddress((const GLubyte*) procname);
}
//////////////////////////////////////////////////////////////////////////
////// GLFW native API //////
//////////////////////////////////////////////////////////////////////////
GLFWAPI GLXContext glfwGetGLXContext(GLFWwindow* handle)
{
_GLFWwindow* window = (_GLFWwindow*) handle;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
return window->glx.context;
}
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