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glfw/src/glx_context.c
Camilla Löwy baed2dad56 Cleanup
2017-11-10 02:58:19 +01:00

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//========================================================================
// GLFW 3.3 GLX - www.glfw.org
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2016 Camilla Löwy <elmindreda@glfw.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>
#ifndef GLXBadProfileARB
#define GLXBadProfileARB 13
#endif
// Returns the specified attribute of the specified GLXFBConfig
//
static int getGLXFBConfigAttrib(GLXFBConfig fbconfig, int attrib)
{
int value;
glXGetFBConfigAttrib(_glfw.x11.display, fbconfig, attrib, &value);
return value;
}
// Return the GLXFBConfig most closely matching the specified hints
//
static GLFWbool chooseGLXFBConfig(const _GLFWfbconfig* desired,
GLXFBConfig* result)
{
GLXFBConfig* nativeConfigs;
_GLFWfbconfig* usableConfigs;
const _GLFWfbconfig* closest;
int i, nativeCount, usableCount;
const char* vendor;
GLFWbool trustWindowBit = GLFW_TRUE;
// HACK: This is a (hopefully temporary) workaround for Chromium
// (VirtualBox GL) not setting the window bit on any GLXFBConfigs
vendor = glXGetClientString(_glfw.x11.display, GLX_VENDOR);
if (vendor && strcmp(vendor, "Chromium") == 0)
trustWindowBit = GLFW_FALSE;
nativeConfigs =
glXGetFBConfigs(_glfw.x11.display, _glfw.x11.screen, &nativeCount);
if (!nativeConfigs || !nativeCount)
{
_glfwInputError(GLFW_API_UNAVAILABLE, "GLX: No GLXFBConfigs returned");
return GLFW_FALSE;
}
usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));
usableCount = 0;
for (i = 0; i < nativeCount; i++)
{
const GLXFBConfig n = nativeConfigs[i];
_GLFWfbconfig* u = usableConfigs + usableCount;
// Only consider RGBA GLXFBConfigs
if (!(getGLXFBConfigAttrib(n, GLX_RENDER_TYPE) & GLX_RGBA_BIT))
continue;
// Only consider window GLXFBConfigs
if (!(getGLXFBConfigAttrib(n, GLX_DRAWABLE_TYPE) & GLX_WINDOW_BIT))
{
if (trustWindowBit)
continue;
}
if (desired->transparent)
{
XVisualInfo* vi = glXGetVisualFromFBConfig(_glfw.x11.display, n);
if (vi)
{
u->transparent = _glfwIsVisualTransparentX11(vi->visual);
XFree(vi);
}
}
u->redBits = getGLXFBConfigAttrib(n, GLX_RED_SIZE);
u->greenBits = getGLXFBConfigAttrib(n, GLX_GREEN_SIZE);
u->blueBits = getGLXFBConfigAttrib(n, GLX_BLUE_SIZE);
u->alphaBits = getGLXFBConfigAttrib(n, GLX_ALPHA_SIZE);
u->depthBits = getGLXFBConfigAttrib(n, GLX_DEPTH_SIZE);
u->stencilBits = getGLXFBConfigAttrib(n, GLX_STENCIL_SIZE);
u->accumRedBits = getGLXFBConfigAttrib(n, GLX_ACCUM_RED_SIZE);
u->accumGreenBits = getGLXFBConfigAttrib(n, GLX_ACCUM_GREEN_SIZE);
u->accumBlueBits = getGLXFBConfigAttrib(n, GLX_ACCUM_BLUE_SIZE);
u->accumAlphaBits = getGLXFBConfigAttrib(n, GLX_ACCUM_ALPHA_SIZE);
u->auxBuffers = getGLXFBConfigAttrib(n, GLX_AUX_BUFFERS);
if (getGLXFBConfigAttrib(n, GLX_STEREO))
u->stereo = GLFW_TRUE;
if (getGLXFBConfigAttrib(n, GLX_DOUBLEBUFFER))
u->doublebuffer = GLFW_TRUE;
if (_glfw.glx.ARB_multisample)
u->samples = getGLXFBConfigAttrib(n, GLX_SAMPLES);
if (_glfw.glx.ARB_framebuffer_sRGB || _glfw.glx.EXT_framebuffer_sRGB)
u->sRGB = getGLXFBConfigAttrib(n, GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB);
u->handle = (uintptr_t) n;
usableCount++;
}
closest = _glfwChooseFBConfig(desired, usableConfigs, usableCount);
if (closest)
*result = (GLXFBConfig) closest->handle;
XFree(nativeConfigs);
free(usableConfigs);
return closest != NULL;
}
// Create the OpenGL context using legacy API
//
static GLXContext createLegacyContextGLX(_GLFWwindow* window,
GLXFBConfig fbconfig,
GLXContext share)
{
return glXCreateNewContext(_glfw.x11.display,
fbconfig,
GLX_RGBA_TYPE,
share,
True);
}
static void makeContextCurrentGLX(_GLFWwindow* window)
{
if (window)
{
if (!glXMakeCurrent(_glfw.x11.display,
window->context.glx.window,
window->context.glx.handle))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"GLX: Failed to make context current");
return;
}
}
else
{
if (!glXMakeCurrent(_glfw.x11.display, None, NULL))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"GLX: Failed to clear current context");
return;
}
}
_glfwPlatformSetTls(&_glfw.contextSlot, window);
}
static void swapBuffersGLX(_GLFWwindow* window)
{
glXSwapBuffers(_glfw.x11.display, window->context.glx.window);
}
static void swapIntervalGLX(int interval)
{
_GLFWwindow* window = _glfwPlatformGetTls(&_glfw.contextSlot);
if (_glfw.glx.EXT_swap_control)
{
_glfw.glx.SwapIntervalEXT(_glfw.x11.display,
window->context.glx.window,
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);
}
}
static int extensionSupportedGLX(const char* extension)
{
const char* extensions =
glXQueryExtensionsString(_glfw.x11.display, _glfw.x11.screen);
if (extensions)
{
if (_glfwStringInExtensionString(extension, extensions))
return GLFW_TRUE;
}
return GLFW_FALSE;
}
static GLFWglproc getProcAddressGLX(const char* procname)
{
if (_glfw.glx.GetProcAddress)
return _glfw.glx.GetProcAddress((const GLubyte*) procname);
else if (_glfw.glx.GetProcAddressARB)
return _glfw.glx.GetProcAddressARB((const GLubyte*) procname);
else
return dlsym(_glfw.glx.handle, procname);
}
// Destroy the OpenGL context
//
static void destroyContextGLX(_GLFWwindow* window)
{
if (window->context.glx.window)
{
glXDestroyWindow(_glfw.x11.display, window->context.glx.window);
window->context.glx.window = None;
}
if (window->context.glx.handle)
{
glXDestroyContext(_glfw.x11.display, window->context.glx.handle);
window->context.glx.handle = NULL;
}
}
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
// Initialize GLX
//
GLFWbool _glfwInitGLX(void)
{
int i;
const char* sonames[] =
{
#if defined(_GLFW_GLX_LIBRARY)
_GLFW_GLX_LIBRARY,
#elif defined(__CYGWIN__)
"libGL-1.so",
#else
"libGL.so.1",
"libGL.so",
#endif
NULL
};
if (_glfw.glx.handle)
return GLFW_TRUE;
for (i = 0; sonames[i]; i++)
{
_glfw.glx.handle = dlopen(sonames[i], RTLD_LAZY | RTLD_GLOBAL);
if (_glfw.glx.handle)
break;
}
if (!_glfw.glx.handle)
{
_glfwInputError(GLFW_API_UNAVAILABLE, "GLX: Failed to load GLX");
return GLFW_FALSE;
}
_glfw.glx.GetFBConfigs =
dlsym(_glfw.glx.handle, "glXGetFBConfigs");
_glfw.glx.GetFBConfigAttrib =
dlsym(_glfw.glx.handle, "glXGetFBConfigAttrib");
_glfw.glx.GetClientString =
dlsym(_glfw.glx.handle, "glXGetClientString");
_glfw.glx.QueryExtension =
dlsym(_glfw.glx.handle, "glXQueryExtension");
_glfw.glx.QueryVersion =
dlsym(_glfw.glx.handle, "glXQueryVersion");
_glfw.glx.DestroyContext =
dlsym(_glfw.glx.handle, "glXDestroyContext");
_glfw.glx.MakeCurrent =
dlsym(_glfw.glx.handle, "glXMakeCurrent");
_glfw.glx.SwapBuffers =
dlsym(_glfw.glx.handle, "glXSwapBuffers");
_glfw.glx.QueryExtensionsString =
dlsym(_glfw.glx.handle, "glXQueryExtensionsString");
_glfw.glx.CreateNewContext =
dlsym(_glfw.glx.handle, "glXCreateNewContext");
_glfw.glx.CreateWindow =
dlsym(_glfw.glx.handle, "glXCreateWindow");
_glfw.glx.DestroyWindow =
dlsym(_glfw.glx.handle, "glXDestroyWindow");
_glfw.glx.GetProcAddress =
dlsym(_glfw.glx.handle, "glXGetProcAddress");
_glfw.glx.GetProcAddressARB =
dlsym(_glfw.glx.handle, "glXGetProcAddressARB");
_glfw.glx.GetVisualFromFBConfig =
dlsym(_glfw.glx.handle, "glXGetVisualFromFBConfig");
if (!_glfw.glx.GetFBConfigs ||
!_glfw.glx.GetFBConfigAttrib ||
!_glfw.glx.GetClientString ||
!_glfw.glx.QueryExtension ||
!_glfw.glx.QueryVersion ||
!_glfw.glx.DestroyContext ||
!_glfw.glx.MakeCurrent ||
!_glfw.glx.SwapBuffers ||
!_glfw.glx.QueryExtensionsString ||
!_glfw.glx.CreateNewContext ||
!_glfw.glx.CreateWindow ||
!_glfw.glx.DestroyWindow ||
!_glfw.glx.GetProcAddress ||
!_glfw.glx.GetProcAddressARB ||
!_glfw.glx.GetVisualFromFBConfig)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"GLX: Failed to load required entry points");
return GLFW_FALSE;
}
if (!glXQueryExtension(_glfw.x11.display,
&_glfw.glx.errorBase,
&_glfw.glx.eventBase))
{
_glfwInputError(GLFW_API_UNAVAILABLE, "GLX: GLX extension not found");
return GLFW_FALSE;
}
if (!glXQueryVersion(_glfw.x11.display, &_glfw.glx.major, &_glfw.glx.minor))
{
_glfwInputError(GLFW_API_UNAVAILABLE,
"GLX: Failed to query GLX version");
return GLFW_FALSE;
}
if (_glfw.glx.major == 1 && _glfw.glx.minor < 3)
{
_glfwInputError(GLFW_API_UNAVAILABLE,
"GLX: GLX version 1.3 is required");
return GLFW_FALSE;
}
if (extensionSupportedGLX("GLX_EXT_swap_control"))
{
_glfw.glx.SwapIntervalEXT = (PFNGLXSWAPINTERVALEXTPROC)
getProcAddressGLX("glXSwapIntervalEXT");
if (_glfw.glx.SwapIntervalEXT)
_glfw.glx.EXT_swap_control = GLFW_TRUE;
}
if (extensionSupportedGLX("GLX_SGI_swap_control"))
{
_glfw.glx.SwapIntervalSGI = (PFNGLXSWAPINTERVALSGIPROC)
getProcAddressGLX("glXSwapIntervalSGI");
if (_glfw.glx.SwapIntervalSGI)
_glfw.glx.SGI_swap_control = GLFW_TRUE;
}
if (extensionSupportedGLX("GLX_MESA_swap_control"))
{
_glfw.glx.SwapIntervalMESA = (PFNGLXSWAPINTERVALMESAPROC)
getProcAddressGLX("glXSwapIntervalMESA");
if (_glfw.glx.SwapIntervalMESA)
_glfw.glx.MESA_swap_control = GLFW_TRUE;
}
if (extensionSupportedGLX("GLX_ARB_multisample"))
_glfw.glx.ARB_multisample = GLFW_TRUE;
if (extensionSupportedGLX("GLX_ARB_framebuffer_sRGB"))
_glfw.glx.ARB_framebuffer_sRGB = GLFW_TRUE;
if (extensionSupportedGLX("GLX_EXT_framebuffer_sRGB"))
_glfw.glx.EXT_framebuffer_sRGB = GLFW_TRUE;
if (extensionSupportedGLX("GLX_ARB_create_context"))
{
_glfw.glx.CreateContextAttribsARB = (PFNGLXCREATECONTEXTATTRIBSARBPROC)
getProcAddressGLX("glXCreateContextAttribsARB");
if (_glfw.glx.CreateContextAttribsARB)
_glfw.glx.ARB_create_context = GLFW_TRUE;
}
if (extensionSupportedGLX("GLX_ARB_create_context_robustness"))
_glfw.glx.ARB_create_context_robustness = GLFW_TRUE;
if (extensionSupportedGLX("GLX_ARB_create_context_profile"))
_glfw.glx.ARB_create_context_profile = GLFW_TRUE;
if (extensionSupportedGLX("GLX_EXT_create_context_es2_profile"))
_glfw.glx.EXT_create_context_es2_profile = GLFW_TRUE;
if (extensionSupportedGLX("GLX_ARB_create_context_no_error"))
_glfw.glx.ARB_create_context_no_error = GLFW_TRUE;
if (extensionSupportedGLX("GLX_ARB_context_flush_control"))
_glfw.glx.ARB_context_flush_control = GLFW_TRUE;
return GLFW_TRUE;
}
// Terminate GLX
//
void _glfwTerminateGLX(void)
{
// NOTE: This function must not call any X11 functions, as it is called
// after XCloseDisplay (see _glfwPlatformTerminate for details)
if (_glfw.glx.handle)
{
dlclose(_glfw.glx.handle);
_glfw.glx.handle = NULL;
}
}
#define setAttrib(a, v) \
{ \
assert((size_t) (index + 1) < sizeof(attribs) / sizeof(attribs[0])); \
attribs[index++] = a; \
attribs[index++] = v; \
}
// Create the OpenGL or OpenGL ES context
//
GLFWbool _glfwCreateContextGLX(_GLFWwindow* window,
const _GLFWctxconfig* ctxconfig,
const _GLFWfbconfig* fbconfig)
{
int attribs[40];
GLXFBConfig native = NULL;
GLXContext share = NULL;
if (ctxconfig->share)
share = ctxconfig->share->context.glx.handle;
if (!chooseGLXFBConfig(fbconfig, &native))
{
_glfwInputError(GLFW_FORMAT_UNAVAILABLE,
"GLX: Failed to find a suitable GLXFBConfig");
return GLFW_FALSE;
}
if (ctxconfig->client == 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 GLFW_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 GLFW_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 GLFW_FALSE;
}
}
_glfwGrabErrorHandlerX11();
if (_glfw.glx.ARB_create_context)
{
int index = 0, mask = 0, flags = 0;
if (ctxconfig->client == GLFW_OPENGL_API)
{
if (ctxconfig->forward)
flags |= GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
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->debug)
flags |= GLX_CONTEXT_DEBUG_BIT_ARB;
if (ctxconfig->robustness)
{
if (_glfw.glx.ARB_create_context_robustness)
{
if (ctxconfig->robustness == GLFW_NO_RESET_NOTIFICATION)
{
setAttrib(GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB,
GLX_NO_RESET_NOTIFICATION_ARB);
}
else if (ctxconfig->robustness == GLFW_LOSE_CONTEXT_ON_RESET)
{
setAttrib(GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB,
GLX_LOSE_CONTEXT_ON_RESET_ARB);
}
flags |= GLX_CONTEXT_ROBUST_ACCESS_BIT_ARB;
}
}
if (ctxconfig->release)
{
if (_glfw.glx.ARB_context_flush_control)
{
if (ctxconfig->release == GLFW_RELEASE_BEHAVIOR_NONE)
{
setAttrib(GLX_CONTEXT_RELEASE_BEHAVIOR_ARB,
GLX_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB);
}
else if (ctxconfig->release == GLFW_RELEASE_BEHAVIOR_FLUSH)
{
setAttrib(GLX_CONTEXT_RELEASE_BEHAVIOR_ARB,
GLX_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB);
}
}
}
if (ctxconfig->noerror)
{
if (_glfw.glx.ARB_create_context_no_error)
setAttrib(GLX_CONTEXT_OPENGL_NO_ERROR_ARB, GLFW_TRUE);
}
// NOTE: Only request an explicitly versioned context when necessary, as
// explicitly requesting version 1.0 does not always return the
// highest version supported by the driver
if (ctxconfig->major != 1 || ctxconfig->minor != 0)
{
setAttrib(GLX_CONTEXT_MAJOR_VERSION_ARB, ctxconfig->major);
setAttrib(GLX_CONTEXT_MINOR_VERSION_ARB, ctxconfig->minor);
}
if (mask)
setAttrib(GLX_CONTEXT_PROFILE_MASK_ARB, mask);
if (flags)
setAttrib(GLX_CONTEXT_FLAGS_ARB, flags);
setAttrib(None, None);
window->context.glx.handle =
_glfw.glx.CreateContextAttribsARB(_glfw.x11.display,
native,
share,
True,
attribs);
// HACK: This is a fallback for broken versions of the Mesa
// implementation of GLX_ARB_create_context_profile that fail
// default 1.0 context creation with a GLXBadProfileARB error in
// violation of the extension spec
if (!window->context.glx.handle)
{
if (_glfw.x11.errorCode == _glfw.glx.errorBase + GLXBadProfileARB &&
ctxconfig->client == GLFW_OPENGL_API &&
ctxconfig->profile == GLFW_OPENGL_ANY_PROFILE &&
ctxconfig->forward == GLFW_FALSE)
{
window->context.glx.handle =
createLegacyContextGLX(window, native, share);
}
}
}
else
{
window->context.glx.handle =
createLegacyContextGLX(window, native, share);
}
_glfwReleaseErrorHandlerX11();
if (!window->context.glx.handle)
{
_glfwInputErrorX11(GLFW_VERSION_UNAVAILABLE, "GLX: Failed to create context");
return GLFW_FALSE;
}
window->context.glx.window =
glXCreateWindow(_glfw.x11.display, native, window->x11.handle, NULL);
if (!window->context.glx.window)
{
_glfwInputError(GLFW_PLATFORM_ERROR, "GLX: Failed to create window");
return GLFW_FALSE;
}
window->context.makeCurrent = makeContextCurrentGLX;
window->context.swapBuffers = swapBuffersGLX;
window->context.swapInterval = swapIntervalGLX;
window->context.extensionSupported = extensionSupportedGLX;
window->context.getProcAddress = getProcAddressGLX;
window->context.destroy = destroyContextGLX;
return GLFW_TRUE;
}
#undef setAttrib
// Returns the Visual and depth of the chosen GLXFBConfig
//
GLFWbool _glfwChooseVisualGLX(const _GLFWwndconfig* wndconfig,
const _GLFWctxconfig* ctxconfig,
const _GLFWfbconfig* fbconfig,
Visual** visual, int* depth)
{
GLXFBConfig native;
XVisualInfo* result;
if (!chooseGLXFBConfig(fbconfig, &native))
{
_glfwInputError(GLFW_FORMAT_UNAVAILABLE,
"GLX: Failed to find a suitable GLXFBConfig");
return GLFW_FALSE;
}
result = glXGetVisualFromFBConfig(_glfw.x11.display, native);
if (!result)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"GLX: Failed to retrieve Visual for GLXFBConfig");
return GLFW_FALSE;
}
*visual = result->visual;
*depth = result->depth;
XFree(result);
return GLFW_TRUE;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW native API //////
//////////////////////////////////////////////////////////////////////////
GLFWAPI GLXContext glfwGetGLXContext(GLFWwindow* handle)
{
_GLFWwindow* window = (_GLFWwindow*) handle;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
if (window->context.client == GLFW_NO_API)
{
_glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
return NULL;
}
return window->context.glx.handle;
}
GLFWAPI GLXWindow glfwGetGLXWindow(GLFWwindow* handle)
{
_GLFWwindow* window = (_GLFWwindow*) handle;
_GLFW_REQUIRE_INIT_OR_RETURN(None);
if (window->context.client == GLFW_NO_API)
{
_glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
return None;
}
return window->context.glx.window;
}
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