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glfw/src/glx_context.c
Camilla Berglund d3ae574418 Formatting.
2014-03-30 10:45:33 +02:00

546 lines
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//========================================================================
// GLFW 3.1 GLX - 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
// Returns the specified attribute of the specified GLXFBConfig
//
static int getFBConfigAttrib(GLXFBConfig fbconfig, int attrib)
{
int value;
glXGetFBConfigAttrib(_glfw.x11.display, fbconfig, attrib, &value);
return value;
}
// Return a list of available and usable framebuffer configs
//
static GLboolean chooseFBConfig(const _GLFWfbconfig* desired, GLXFBConfig* result)
{
GLXFBConfig* nativeConfigs;
_GLFWfbconfig* usableConfigs;
const _GLFWfbconfig* closest;
int i, nativeCount, usableCount;
const char* vendor;
GLboolean trustWindowBit = GL_TRUE;
vendor = glXGetClientString(_glfw.x11.display, GLX_VENDOR);
if (strcmp(vendor, "Chromium") == 0)
{
// HACK: This is a (hopefully temporary) workaround for Chromium
// (VirtualBox GL) not setting the window bit on any GLXFBConfigs
trustWindowBit = GL_FALSE;
}
nativeConfigs = glXGetFBConfigs(_glfw.x11.display, _glfw.x11.screen,
&nativeCount);
if (!nativeCount)
{
_glfwInputError(GLFW_API_UNAVAILABLE, "GLX: No GLXFBConfigs returned");
return GL_FALSE;
}
usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));
usableCount = 0;
for (i = 0; i < nativeCount; i++)
{
const GLXFBConfig n = nativeConfigs[i];
_GLFWfbconfig* u = usableConfigs + usableCount;
if (!getFBConfigAttrib(n, GLX_DOUBLEBUFFER) ||
!getFBConfigAttrib(n, GLX_VISUAL_ID))
{
// Only consider double-buffered GLXFBConfigs with associated visuals
continue;
}
if (!(getFBConfigAttrib(n, GLX_RENDER_TYPE) & GLX_RGBA_BIT))
{
// Only consider RGBA GLXFBConfigs
continue;
}
if (!(getFBConfigAttrib(n, GLX_DRAWABLE_TYPE) & GLX_WINDOW_BIT))
{
if (trustWindowBit)
{
// Only consider window GLXFBConfigs
continue;
}
}
u->redBits = getFBConfigAttrib(n, GLX_RED_SIZE);
u->greenBits = getFBConfigAttrib(n, GLX_GREEN_SIZE);
u->blueBits = getFBConfigAttrib(n, GLX_BLUE_SIZE);
u->alphaBits = getFBConfigAttrib(n, GLX_ALPHA_SIZE);
u->depthBits = getFBConfigAttrib(n, GLX_DEPTH_SIZE);
u->stencilBits = getFBConfigAttrib(n, GLX_STENCIL_SIZE);
u->accumRedBits = getFBConfigAttrib(n, GLX_ACCUM_RED_SIZE);
u->accumGreenBits = getFBConfigAttrib(n, GLX_ACCUM_GREEN_SIZE);
u->accumBlueBits = getFBConfigAttrib(n, GLX_ACCUM_BLUE_SIZE);
u->accumAlphaBits = getFBConfigAttrib(n, GLX_ACCUM_ALPHA_SIZE);
u->auxBuffers = getFBConfigAttrib(n, GLX_AUX_BUFFERS);
u->stereo = getFBConfigAttrib(n, GLX_STEREO);
if (_glfw.glx.ARB_multisample)
u->samples = getFBConfigAttrib(n, GLX_SAMPLES);
if (_glfw.glx.ARB_framebuffer_sRGB)
u->sRGB = getFBConfigAttrib(n, GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB);
u->glx = n;
usableCount++;
}
closest = _glfwChooseFBConfig(desired, usableConfigs, usableCount);
if (closest)
*result = closest->glx;
XFree(nativeConfigs);
free(usableConfigs);
return closest ? GL_TRUE : GL_FALSE;
}
// Create the OpenGL context using legacy API
//
static GLXContext createLegacyContext(_GLFWwindow* window,
GLXFBConfig fbconfig,
GLXContext share)
{
return glXCreateNewContext(_glfw.x11.display,
fbconfig,
GLX_RGBA_TYPE,
share,
True);
}
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
// Initialize GLX
//
int _glfwInitContextAPI(void)
{
#ifdef _GLFW_DLOPEN_LIBGL
_glfw.glx.libGL = dlopen("libGL.so.1", RTLD_LAZY | RTLD_GLOBAL);
if (!_glfw.glx.libGL)
{
_glfwInputError(GLFW_PLATFORM_ERROR, "GLX: Failed to find libGL");
return GL_FALSE;
}
#endif
if (pthread_key_create(&_glfw.glx.current, NULL) != 0)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"GLX: Failed to create context TLS");
return GL_FALSE;
}
if (!glXQueryExtension(_glfw.x11.display,
&_glfw.glx.errorBase,
&_glfw.glx.eventBase))
{
_glfwInputError(GLFW_API_UNAVAILABLE, "GLX: GLX extension 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 (_glfw.glx.versionMajor == 1 && _glfw.glx.versionMinor < 3)
{
_glfwInputError(GLFW_API_UNAVAILABLE,
"GLX: GLX version 1.3 is required");
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_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
pthread_key_delete(_glfw.glx.current);
}
#define setGLXattrib(attribName, attribValue) \
{ \
attribs[index++] = attribName; \
attribs[index++] = attribValue; \
assert((size_t) index < sizeof(attribs) / sizeof(attribs[0])); \
}
// Prepare for creation of the OpenGL context
//
int _glfwCreateContext(_GLFWwindow* window,
const _GLFWctxconfig* ctxconfig,
const _GLFWfbconfig* fbconfig)
{
int attribs[40];
GLXFBConfig native;
GLXContext share = NULL;
if (ctxconfig->share)
share = ctxconfig->share->glx.context;
if (!chooseFBConfig(fbconfig, &native))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"GLX: Failed to find a suitable GLXFBConfig");
return GL_FALSE;
}
// Retrieve the corresponding visual
window->glx.visual = glXGetVisualFromFBConfig(_glfw.x11.display, native);
if (window->glx.visual == NULL)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"GLX: Failed to retrieve visual for GLXFBConfig");
return GL_FALSE;
}
if (ctxconfig->api == GLFW_OPENGL_ES_API)
{
if (!_glfw.glx.ARB_create_context ||
!_glfw.glx.ARB_create_context_profile ||
!_glfw.glx.EXT_create_context_es2_profile)
{
_glfwInputError(GLFW_API_UNAVAILABLE,
"GLX: OpenGL ES requested but "
"GLX_EXT_create_context_es2_profile is unavailable");
return GL_FALSE;
}
}
if (ctxconfig->forward)
{
if (!_glfw.glx.ARB_create_context)
{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"GLX: Forward compatibility requested but "
"GLX_ARB_create_context_profile is unavailable");
return GL_FALSE;
}
}
if (ctxconfig->profile)
{
if (!_glfw.glx.ARB_create_context ||
!_glfw.glx.ARB_create_context_profile)
{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"GLX: An OpenGL profile requested but "
"GLX_ARB_create_context_profile is unavailable");
return GL_FALSE;
}
}
_glfwGrabXErrorHandler();
if (_glfw.glx.ARB_create_context)
{
int index = 0, mask = 0, flags = 0, strategy = 0;
if (ctxconfig->api == GLFW_OPENGL_API)
{
if (ctxconfig->forward)
flags |= GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
if (ctxconfig->debug)
flags |= GLX_CONTEXT_DEBUG_BIT_ARB;
if (ctxconfig->profile)
{
if (ctxconfig->profile == GLFW_OPENGL_CORE_PROFILE)
mask |= GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
else if (ctxconfig->profile == GLFW_OPENGL_COMPAT_PROFILE)
mask |= GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
}
}
else
mask |= GLX_CONTEXT_ES2_PROFILE_BIT_EXT;
if (ctxconfig->robustness != GLFW_NO_ROBUSTNESS)
{
if (_glfw.glx.ARB_create_context_robustness)
{
if (ctxconfig->robustness == GLFW_NO_RESET_NOTIFICATION)
strategy = GLX_NO_RESET_NOTIFICATION_ARB;
else if (ctxconfig->robustness == GLFW_LOSE_CONTEXT_ON_RESET)
strategy = GLX_LOSE_CONTEXT_ON_RESET_ARB;
flags |= GLX_CONTEXT_ROBUST_ACCESS_BIT_ARB;
}
}
if (ctxconfig->major != 1 || ctxconfig->minor != 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, ctxconfig->major);
setGLXattrib(GLX_CONTEXT_MINOR_VERSION_ARB, ctxconfig->minor);
}
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 extension spec
if (_glfw.x11.errorCode == _glfw.glx.errorBase + GLXBadProfileARB &&
ctxconfig->api == GLFW_OPENGL_API &&
ctxconfig->profile == GLFW_OPENGL_ANY_PROFILE &&
ctxconfig->forward == GL_FALSE)
{
window->glx.context = createLegacyContext(window, native, share);
}
}
}
else
window->glx.context = createLegacyContext(window, native, share);
_glfwReleaseXErrorHandler();
if (window->glx.context == NULL)
{
_glfwInputXError(GLFW_PLATFORM_ERROR, "GLX: Failed to create context");
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);
pthread_setspecific(_glfw.glx.current, window);
}
_GLFWwindow* _glfwPlatformGetCurrentContext(void)
{
return (_GLFWwindow*) pthread_getspecific(_glfw.glx.current);
}
void _glfwPlatformSwapBuffers(_GLFWwindow* window)
{
glXSwapBuffers(_glfw.x11.display, window->x11.handle);
}
void _glfwPlatformSwapInterval(int interval)
{
_GLFWwindow* window = _glfwPlatformGetCurrentContext();
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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