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128 lines
4.8 KiB
128 lines
4.8 KiB
/* |
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This file is part of Magnum. |
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Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 |
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Vladimír Vondruš <mosra@centrum.cz> |
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Permission is hereby granted, free of charge, to any person obtaining a |
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copy of this software and associated documentation files (the "Software"), |
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to deal in the Software without restriction, including without limitation |
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the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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and/or sell copies of the Software, and to permit persons to whom the |
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Software is furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included |
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in all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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DEALINGS IN THE SOFTWARE. |
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*/ |
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#include "OpenGLFunctionLoader.h" |
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#include <Corrade/Utility/Assert.h> |
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/* EGL-specific includes */ |
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#ifdef MAGNUM_PLATFORM_USE_EGL |
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#include <EGL/egl.h> |
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/* CGL-specific includes */ |
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#elif defined(CORRADE_TARGET_APPLE) |
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#include <dlfcn.h> |
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/* WGL-specific stuff */ |
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#elif defined(CORRADE_TARGET_WINDOWS) |
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#ifdef _MSC_VER |
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#pragma warning(disable: 4055) |
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#pragma warning(disable: 4054) |
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#endif |
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#ifndef WIN32_LEAN_AND_MEAN |
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#define WIN32_LEAN_AND_MEAN |
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#endif |
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#include <windows.h> |
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/* GLX-specific includes */ |
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#elif defined(CORRADE_TARGET_UNIX) && defined(MAGNUM_PLATFORM_USE_GLX) |
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#include <GL/glx.h> |
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/* Otherwise unsupported */ |
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#else |
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#error unsupported platform |
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#endif |
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namespace Magnum { namespace Platform { namespace Implementation { |
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/* EGL-specific implementation */ |
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#ifdef MAGNUM_PLATFORM_USE_EGL |
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OpenGLFunctionLoader::OpenGLFunctionLoader() = default; |
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OpenGLFunctionLoader::~OpenGLFunctionLoader() = default; |
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auto OpenGLFunctionLoader::load(const char* const name) -> FunctionPointer { |
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return eglGetProcAddress(name); |
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} |
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/* CGL-specific implementation. Apple doesn't have any possibility of a |
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"desktop GLES" implementation (and never will have), so explicitly check |
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that we are *not* on GLES. */ |
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#elif defined(CORRADE_TARGET_APPLE) && !defined(MAGNUM_TARGET_GLES) |
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OpenGLFunctionLoader::OpenGLFunctionLoader() { |
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CORRADE_INTERNAL_ASSERT_OUTPUT(library = dlopen("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", RTLD_LAZY)); |
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} |
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OpenGLFunctionLoader::~OpenGLFunctionLoader() { |
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dlclose(library); |
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} |
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auto OpenGLFunctionLoader::load(const char* const name) -> FunctionPointer { |
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return reinterpret_cast<FunctionPointer>(dlsym(library, name)); |
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} |
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/* WGL-specific implementation */ |
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#elif defined(CORRADE_TARGET_WINDOWS) |
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OpenGLFunctionLoader::OpenGLFunctionLoader() { |
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library = GetModuleHandleA("opengl32.dll"); |
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getProcAddress = reinterpret_cast<FunctionPointer>(GetProcAddress(library, "wglGetProcAddress")); |
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} |
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/* FreeLibrary() should not be called: |
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https://docs.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-getmodulehandlea */ |
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OpenGLFunctionLoader::~OpenGLFunctionLoader() = default; |
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auto OpenGLFunctionLoader::load(const char* const name) -> FunctionPointer { |
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/* First try wglGetProcAddress that we extracted above, then a |
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normal GetProcAddress(). Not using wglGetProcAddress() directly because |
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that would mean we need to explicitly link to opengl32.dll (and since |
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this is inside a static library, also forcing our users to link to it |
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too). And why do that when `library` has that already anyway. */ |
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const PROC address = reinterpret_cast<PROC(WINAPI*)(LPCSTR)>(getProcAddress)(reinterpret_cast<LPCSTR>(name)); |
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/* This actually is real, it seems -- OH MY GOD |
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https://community.khronos.org/t/wglgetprocaddress/77122 */ |
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const auto integerAddress = reinterpret_cast<std::ptrdiff_t>(address); |
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if(address && integerAddress != 1 && integerAddress != 2 && |
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integerAddress != 3 && integerAddress != -1) return reinterpret_cast<FunctionPointer>(address); |
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return reinterpret_cast<FunctionPointer>(GetProcAddress(library, reinterpret_cast<LPCSTR>(name))); |
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} |
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/* GLX-specific implementation */ |
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#elif defined(CORRADE_TARGET_UNIX) && defined(MAGNUM_PLATFORM_USE_GLX) |
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OpenGLFunctionLoader::OpenGLFunctionLoader() = default; |
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OpenGLFunctionLoader::~OpenGLFunctionLoader() = default; |
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auto OpenGLFunctionLoader::load(const char* const name) -> FunctionPointer { |
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return glXGetProcAddressARB(reinterpret_cast<const GLubyte*>(name)); |
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} |
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/* Otherwise unsupported */ |
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#else |
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#error unsupported platform |
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#endif |
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}}}
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