//========================================================================

// 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 (strcmp(vendor, "Chromium") == 0)

trustWindowBit = GLFW_FALSE;

nativeConfigs =

glXGetFBConfigs(_glfw.x11.display, _glfw.x11.screen, &nativeCount);

if (!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;

}

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;

}

}

_glfwPlatformSetCurrentContext(window);

}

static void swapBuffersGLX(_GLFWwindow* window)

{

glXSwapBuffers(_glfw.x11.display, window->context.glx.window);

}

static void swapIntervalGLX(int interval)

{

_GLFWwindow* window = _glfwPlatformGetCurrentContext();

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(__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_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 setGLXattrib(attribName, attribValue) \

{ \

attribs[index++] = attribName; \

attribs[index++] = attribValue; \

assert((size_t) index < sizeof(attribs) / sizeof(attribs[0])); \

}

// 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->noerror)

flags |= GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR;

if (ctxconfig->robustness)

{

if (_glfw.glx.ARB_create_context_robustness)

{

if (ctxconfig->robustness == GLFW_NO_RESET_NOTIFICATION)

{

setGLXattrib(GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB,

GLX_NO_RESET_NOTIFICATION_ARB);

}

else if (ctxconfig->robustness == GLFW_LOSE_CONTEXT_ON_RESET)

{

setGLXattrib(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)

{

setGLXattrib(GLX_CONTEXT_RELEASE_BEHAVIOR_ARB,

GLX_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB);

}

else if (ctxconfig->release == GLFW_RELEASE_BEHAVIOR_FLUSH)

{

setGLXattrib(GLX_CONTEXT_RELEASE_BEHAVIOR_ARB,

GLX_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB);

}

}

}

// 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)

{

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);

setGLXattrib(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 setGLXattrib

// Returns the Visual and depth of the chosen GLXFBConfig

//

GLFWbool _glfwChooseVisualGLX(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;

}