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Diffstat (limited to 'third_party/libepoxy/libepoxy/src/dispatch_common.c')
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diff --git a/third_party/libepoxy/libepoxy/src/dispatch_common.c b/third_party/libepoxy/libepoxy/src/dispatch_common.c new file mode 100644 index 0000000000..153eb7c5f4 --- /dev/null +++ b/third_party/libepoxy/libepoxy/src/dispatch_common.c @@ -0,0 +1,932 @@ +/* + * Copyright © 2013-2014 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +/** + * \mainpage Epoxy + * + * \section intro_sec Introduction + * + * Epoxy is a library for handling OpenGL function pointer management for + * you. + * + * It hides the complexity of `dlopen()`, `dlsym()`, `glXGetProcAddress()`, + * `eglGetProcAddress()`, etc. from the app developer, with very little + * knowledge needed on their part. They get to read GL specs and write + * code using undecorated function names like `glCompileShader()`. + * + * Don't forget to check for your extensions or versions being present + * before you use them, just like before! We'll tell you what you forgot + * to check for instead of just segfaulting, though. + * + * \section features_sec Features + * + * - Automatically initializes as new GL functions are used. + * - GL 4.6 core and compatibility context support. + * - GLES 1/2/3 context support. + * - Knows about function aliases so (e.g.) `glBufferData()` can be + * used with `GL_ARB_vertex_buffer_object` implementations, along + * with GL 1.5+ implementations. + * - EGL, GLX, and WGL support. + * - Can be mixed with non-epoxy GL usage. + * + * \section using_sec Using Epoxy + * + * Using Epoxy should be as easy as replacing: + * + * ```cpp + * #include <GL/gl.h> + * #include <GL/glx.h> + * #include <GL/glext.h> + * ``` + * + * with: + * + * ```cpp + * #include <epoxy/gl.h> + * #include <epoxy/glx.h> + * ``` + * + * \subsection using_include_sec Headers + * + * Epoxy comes with the following public headers: + * + * - `epoxy/gl.h` - For GL API + * - `epoxy/egl.h` - For EGL API + * - `epoxy/glx.h` - For GLX API + * - `epoxy/wgl.h` - For WGL API + * + * \section links_sec Additional links + * + * The latest version of the Epoxy code is available on [GitHub](https://github.com/anholt/libepoxy). + * + * For bug reports and enhancements, please use the [Issues](https://github.com/anholt/libepoxy/issues) + * link. + * + * The scope of this API reference does not include the documentation for + * OpenGL and OpenGL ES. For more information on those programming interfaces + * please visit: + * + * - [Khronos](https://www.khronos.org/) + * - [OpenGL page on Khronos.org](https://www.khronos.org/opengl/) + * - [OpenGL ES page on Khronos.org](https://www.khronos.org/opengles/) + * - [docs.GL](http://docs.gl/) + */ + +/** + * @file dispatch_common.c + * + * @brief Implements common code shared by the generated GL/EGL/GLX dispatch code. + * + * A collection of some important specs on getting GL function pointers. + * + * From the linux GL ABI (http://www.opengl.org/registry/ABI/): + * + * "3.4. The libraries must export all OpenGL 1.2, GLU 1.3, GLX 1.3, and + * ARB_multitexture entry points statically. + * + * 3.5. Because non-ARB extensions vary so widely and are constantly + * increasing in number, it's infeasible to require that they all be + * supported, and extensions can always be added to hardware drivers + * after the base link libraries are released. These drivers are + * dynamically loaded by libGL, so extensions not in the base + * library must also be obtained dynamically. + * + * 3.6. To perform the dynamic query, libGL also must export an entry + * point called + * + * void (*glXGetProcAddressARB(const GLubyte *))(); + * + * The full specification of this function is available separately. It + * takes the string name of a GL or GLX entry point and returns a pointer + * to a function implementing that entry point. It is functionally + * identical to the wglGetProcAddress query defined by the Windows OpenGL + * library, except that the function pointers returned are context + * independent, unlike the WGL query." + * + * From the EGL 1.4 spec: + * + * "Client API function pointers returned by eglGetProcAddress are + * independent of the display and the currently bound client API context, + * and may be used by any client API context which supports the extension. + * + * eglGetProcAddress may be queried for all of the following functions: + * + * • All EGL and client API extension functions supported by the + * implementation (whether those extensions are supported by the current + * client API context or not). This includes any mandatory OpenGL ES + * extensions. + * + * eglGetProcAddress may not be queried for core (non-extension) functions + * in EGL or client APIs 20 . + * + * For functions that are queryable with eglGetProcAddress, + * implementations may choose to also export those functions statically + * from the object libraries im- plementing those functions. However, + * portable clients cannot rely on this behavior. + * + * From the GLX 1.4 spec: + * + * "glXGetProcAddress may be queried for all of the following functions: + * + * • All GL and GLX extension functions supported by the implementation + * (whether those extensions are supported by the current context or + * not). + * + * • All core (non-extension) functions in GL and GLX from version 1.0 up + * to and including the versions of those specifications supported by + * the implementation, as determined by glGetString(GL VERSION) and + * glXQueryVersion queries." + */ + +#include <assert.h> +#include <stdlib.h> +#ifdef _WIN32 +#include <windows.h> +#else +#include <dlfcn.h> +#include <err.h> +#include <pthread.h> +#endif +#include <string.h> +#include <ctype.h> +#include <stdio.h> + +#include "dispatch_common.h" + +#if defined(__APPLE__) +#define GLX_LIB "/opt/X11/lib/libGL.1.dylib" +#define OPENGL_LIB "/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL" +#define GLES1_LIB "libGLESv1_CM.so" +#define GLES2_LIB "libGLESv2.so" +#elif defined(__ANDROID__) +#define GLX_LIB "libGLESv2.so" +#define EGL_LIB "libEGL.so" +#define GLES1_LIB "libGLESv1_CM.so" +#define GLES2_LIB "libGLESv2.so" +#elif defined(_WIN32) +#define EGL_LIB "libEGL.dll" +#define GLES1_LIB "libGLES_CM.dll" +#define GLES2_LIB "libGLESv2.dll" +#define OPENGL_LIB "OPENGL32" +#else +#define GLVND_GLX_LIB "libGLX.so.1" +#define GLX_LIB "libGL.so.1" +#define EGL_LIB "libEGL.so.1" +#define GLES1_LIB "libGLESv1_CM.so.1" +#define GLES2_LIB "libGLESv2.so.2" +#define OPENGL_LIB "libOpenGL.so.0" +#endif + +#ifdef __GNUC__ +#define CONSTRUCT(_func) static void _func (void) __attribute__((constructor)); +#define DESTRUCT(_func) static void _func (void) __attribute__((destructor)); +#elif defined (_MSC_VER) && (_MSC_VER >= 1500) +#define CONSTRUCT(_func) \ + static void _func(void); \ + static int _func ## _wrapper(void) { _func(); return 0; } \ + __pragma(section(".CRT$XCU",read)) \ + __declspec(allocate(".CRT$XCU")) static int (* _array ## _func)(void) = _func ## _wrapper; + +#define DESTRUCT(_func) \ + static void _func(void); \ + static int _func ## _constructor(void) { atexit (_func); return 0; } \ + __pragma(section(".CRT$XCU",read)) \ + __declspec(allocate(".CRT$XCU")) static int (* _array ## _func)(void) = _func ## _constructor; + +#else +#error "You will need constructor support for your compiler" +#endif + +struct api { +#ifndef _WIN32 + /* + * Locking for making sure we don't double-dlopen(). + */ + pthread_mutex_t mutex; +#endif + + /* + * dlopen() return value for the GLX API. This is libGLX.so.1 if the + * runtime is glvnd-enabled, else libGL.so.1 + */ + void *glx_handle; + + /* + * dlopen() return value for the desktop GL library. + * + * On Windows this is OPENGL32. On OSX this is classic libGL. On Linux + * this is either libOpenGL (if the runtime is glvnd-enabled) or + * classic libGL.so.1 + */ + void *gl_handle; + + /* dlopen() return value for libEGL.so.1 */ + void *egl_handle; + + /* dlopen() return value for libGLESv1_CM.so.1 */ + void *gles1_handle; + + /* dlopen() return value for libGLESv2.so.2 */ + void *gles2_handle; + + /* + * This value gets incremented when any thread is in + * glBegin()/glEnd() called through epoxy. + * + * We're not guaranteed to be called through our wrapper, so the + * conservative paths also try to handle the failure cases they'll + * see if begin_count didn't reflect reality. It's also a bit of + * a bug that the conservative paths might return success because + * some other thread was in epoxy glBegin/glEnd while our thread + * is trying to resolve, but given that it's basically just for + * informative error messages, we shouldn't need to care. + */ + long begin_count; +}; + +static struct api api = { +#ifndef _WIN32 + .mutex = PTHREAD_MUTEX_INITIALIZER, +#else + 0, +#endif +}; + +static bool library_initialized; + +static bool epoxy_current_context_is_glx(void); + +#if PLATFORM_HAS_EGL +static EGLenum +epoxy_egl_get_current_gl_context_api(void); +#endif + +CONSTRUCT (library_init) + +static void +library_init(void) +{ + library_initialized = true; +} + +static bool +get_dlopen_handle(void **handle, const char *lib_name, bool exit_on_fail, bool load) +{ + if (*handle) + return true; + + if (!library_initialized) { + fputs("Attempting to dlopen() while in the dynamic linker.\n", stderr); + abort(); + } + +#ifdef _WIN32 + *handle = LoadLibraryA(lib_name); +#else + pthread_mutex_lock(&api.mutex); + if (!*handle) { + int flags = RTLD_LAZY | RTLD_LOCAL; + if (!load) + flags |= RTLD_NOLOAD; + + *handle = dlopen(lib_name, flags); + if (!*handle) { + if (exit_on_fail) { + fprintf(stderr, "Couldn't open %s: %s\n", lib_name, dlerror()); + abort(); + } else { + (void)dlerror(); + } + } + } + pthread_mutex_unlock(&api.mutex); +#endif + + return *handle != NULL; +} + +static void * +do_dlsym(void **handle, const char *name, bool exit_on_fail) +{ + void *result; + const char *error = ""; + +#ifdef _WIN32 + result = GetProcAddress(*handle, name); +#else + result = dlsym(*handle, name); + if (!result) + error = dlerror(); +#endif + if (!result && exit_on_fail) { + fprintf(stderr, "%s() not found: %s\n", name, error); + abort(); + } + + return result; +} + +/** + * @brief Checks whether we're using OpenGL or OpenGL ES + * + * @return `true` if we're using OpenGL + */ +bool +epoxy_is_desktop_gl(void) +{ + const char *es_prefix = "OpenGL ES"; + const char *version; + +#if PLATFORM_HAS_EGL + /* PowerVR's OpenGL ES implementation (and perhaps other) don't + * comply with the standard, which states that + * "glGetString(GL_VERSION)" should return a string starting with + * "OpenGL ES". Therefore, to distinguish desktop OpenGL from + * OpenGL ES, we must also check the context type through EGL (we + * can do that as PowerVR is only usable through EGL). + */ + if (!epoxy_current_context_is_glx()) { + switch (epoxy_egl_get_current_gl_context_api()) { + case EGL_OPENGL_API: return true; + case EGL_OPENGL_ES_API: return false; + case EGL_NONE: + default: break; + } + } +#endif + + if (api.begin_count) + return true; + + version = (const char *)glGetString(GL_VERSION); + + /* If we didn't get a version back, there are only two things that + * could have happened: either malloc failure (which basically + * doesn't exist), or we were called within a glBegin()/glEnd(). + * Assume the second, which only exists for desktop GL. + */ + if (!version) + return true; + + return strncmp(es_prefix, version, strlen(es_prefix)); +} + +static int +epoxy_internal_gl_version(GLenum version_string, int error_version, int factor) +{ + const char *version = (const char *)glGetString(version_string); + GLint major, minor; + int scanf_count; + + if (!version) + return error_version; + + /* skip to version number */ + while (!isdigit(*version) && *version != '\0') + version++; + + /* Interpret version number */ + scanf_count = sscanf(version, "%i.%i", &major, &minor); + if (scanf_count != 2) { + fprintf(stderr, "Unable to interpret GL_VERSION string: %s\n", + version); + abort(); + } + + return factor * major + minor; +} + +/** + * @brief Returns the version of OpenGL we are using + * + * The version is encoded as: + * + * ``` + * + * version = major * 10 + minor + * + * ``` + * + * So it can be easily used for version comparisons. + * + * @return The encoded version of OpenGL we are using + */ +int +epoxy_gl_version(void) +{ + return epoxy_internal_gl_version(GL_VERSION, 0, 10); +} + +int +epoxy_conservative_gl_version(void) +{ + if (api.begin_count) + return 100; + + return epoxy_internal_gl_version(GL_VERSION, 100, 10); +} + +/** + * @brief Returns the version of the GL Shading Language we are using + * + * The version is encoded as: + * + * ``` + * + * version = major * 100 + minor + * + * ``` + * + * So it can be easily used for version comparisons. + * + * @return The encoded version of the GL Shading Language we are using + */ +int +epoxy_glsl_version(void) +{ + if (epoxy_gl_version() >= 20 || + epoxy_has_gl_extension ("GL_ARB_shading_language_100")) + return epoxy_internal_gl_version(GL_SHADING_LANGUAGE_VERSION, 0, 100); + + return 0; +} + +/** + * @brief Checks for the presence of an extension in an OpenGL extension string + * + * @param extension_list The string containing the list of extensions to check + * @param ext The name of the GL extension + * @return `true` if the extension is available' + * + * @note If you are looking to check whether a normal GL, EGL or GLX extension + * is supported by the client, this probably isn't the function you want. + * + * Some parts of the spec for OpenGL and friends will return an OpenGL formatted + * extension string that is separate from the usual extension strings for the + * spec. This function provides easy parsing of those strings. + * + * @see epoxy_has_gl_extension() + * @see epoxy_has_egl_extension() + * @see epoxy_has_glx_extension() + */ +bool +epoxy_extension_in_string(const char *extension_list, const char *ext) +{ + const char *ptr = extension_list; + int len; + + if (!ext) + return false; + + len = strlen(ext); + + if (extension_list == NULL || *extension_list == '\0') + return false; + + /* Make sure that don't just find an extension with our name as a prefix. */ + while (true) { + ptr = strstr(ptr, ext); + if (!ptr) + return false; + + if (ptr[len] == ' ' || ptr[len] == 0) + return true; + ptr += len; + } +} + +static bool +epoxy_internal_has_gl_extension(const char *ext, bool invalid_op_mode) +{ + if (epoxy_gl_version() < 30) { + const char *exts = (const char *)glGetString(GL_EXTENSIONS); + if (!exts) + return invalid_op_mode; + return epoxy_extension_in_string(exts, ext); + } else { + int num_extensions; + int i; + + glGetIntegerv(GL_NUM_EXTENSIONS, &num_extensions); + if (num_extensions == 0) + return invalid_op_mode; + + for (i = 0; i < num_extensions; i++) { + const char *gl_ext = (const char *)glGetStringi(GL_EXTENSIONS, i); + if (!gl_ext) + return false; + if (strcmp(ext, gl_ext) == 0) + return true; + } + + return false; + } +} + +bool +epoxy_load_glx(bool exit_if_fails, bool load) +{ +#if PLATFORM_HAS_GLX +# ifdef GLVND_GLX_LIB + /* prefer the glvnd library if it exists */ + if (!api.glx_handle) + get_dlopen_handle(&api.glx_handle, GLVND_GLX_LIB, false, load); +# endif + if (!api.glx_handle) + get_dlopen_handle(&api.glx_handle, GLX_LIB, exit_if_fails, load); +#endif + return api.glx_handle != NULL; +} + +void * +epoxy_conservative_glx_dlsym(const char *name, bool exit_if_fails) +{ +#if PLATFORM_HAS_GLX + if (epoxy_load_glx(exit_if_fails, exit_if_fails)) + return do_dlsym(&api.glx_handle, name, exit_if_fails); +#endif + return NULL; +} + +/** + * Tests whether the currently bound context is EGL or GLX, trying to + * avoid loading libraries unless necessary. + */ +static bool +epoxy_current_context_is_glx(void) +{ +#if !PLATFORM_HAS_GLX + return false; +#else + void *sym; + + sym = epoxy_conservative_glx_dlsym("glXGetCurrentContext", false); + if (sym) { + if (glXGetCurrentContext()) + return true; + } else { + (void)dlerror(); + } + +#if PLATFORM_HAS_EGL + sym = epoxy_conservative_egl_dlsym("eglGetCurrentContext", false); + if (sym) { + if (epoxy_egl_get_current_gl_context_api() != EGL_NONE) + return false; + } else { + (void)dlerror(); + } +#endif /* PLATFORM_HAS_EGL */ + + return false; +#endif /* PLATFORM_HAS_GLX */ +} + +/** + * @brief Returns true if the given GL extension is supported in the current context. + * + * @param ext The name of the GL extension + * @return `true` if the extension is available + * + * @note that this function can't be called from within `glBegin()` and `glEnd()`. + * + * @see epoxy_has_egl_extension() + * @see epoxy_has_glx_extension() + */ +bool +epoxy_has_gl_extension(const char *ext) +{ + return epoxy_internal_has_gl_extension(ext, false); +} + +bool +epoxy_conservative_has_gl_extension(const char *ext) +{ + if (api.begin_count) + return true; + + return epoxy_internal_has_gl_extension(ext, true); +} + +bool +epoxy_load_egl(bool exit_if_fails, bool load) +{ +#if PLATFORM_HAS_EGL + return get_dlopen_handle(&api.egl_handle, EGL_LIB, exit_if_fails, load); +#else + return false; +#endif +} + +void * +epoxy_conservative_egl_dlsym(const char *name, bool exit_if_fails) +{ +#if PLATFORM_HAS_EGL + if (epoxy_load_egl(exit_if_fails, exit_if_fails)) + return do_dlsym(&api.egl_handle, name, exit_if_fails); +#endif + return NULL; +} + +void * +epoxy_egl_dlsym(const char *name) +{ + return epoxy_conservative_egl_dlsym(name, true); +} + +void * +epoxy_glx_dlsym(const char *name) +{ + return epoxy_conservative_glx_dlsym(name, true); +} + +static void +epoxy_load_gl(void) +{ + if (api.gl_handle) + return; + +#if defined(_WIN32) || defined(__APPLE__) + get_dlopen_handle(&api.gl_handle, OPENGL_LIB, true, true); +#else + + // Prefer GLX_LIB over OPENGL_LIB to maintain existing behavior. + // Using the inverse ordering OPENGL_LIB -> GLX_LIB, causes issues such as: + // https://github.com/anholt/libepoxy/issues/240 (apitrace missing calls) + // https://github.com/anholt/libepoxy/issues/252 (Xorg boot crash) + get_dlopen_handle(&api.glx_handle, GLX_LIB, false, true); + api.gl_handle = api.glx_handle; + +#if defined(OPENGL_LIB) + if (!api.gl_handle) + get_dlopen_handle(&api.gl_handle, OPENGL_LIB, false, true); +#endif + + if (!api.gl_handle) { +#if defined(OPENGL_LIB) + fprintf(stderr, "Couldn't open %s or %s\n", GLX_LIB, OPENGL_LIB); +#else + fprintf(stderr, "Couldn't open %s\n", GLX_LIB); +#endif + abort(); + } + +#endif +} + +void * +epoxy_gl_dlsym(const char *name) +{ + epoxy_load_gl(); + + return do_dlsym(&api.gl_handle, name, true); +} + +void * +epoxy_gles1_dlsym(const char *name) +{ + if (epoxy_current_context_is_glx()) { + return epoxy_get_proc_address(name); + } else { + get_dlopen_handle(&api.gles1_handle, GLES1_LIB, true, true); + return do_dlsym(&api.gles1_handle, name, true); + } +} + +void * +epoxy_gles2_dlsym(const char *name) +{ + if (epoxy_current_context_is_glx()) { + return epoxy_get_proc_address(name); + } else { + get_dlopen_handle(&api.gles2_handle, GLES2_LIB, true, true); + return do_dlsym(&api.gles2_handle, name, true); + } +} + +/** + * Does the appropriate dlsym() or eglGetProcAddress() for GLES3 + * functions. + * + * Mesa interpreted GLES as intending that the GLES3 functions were + * available only through eglGetProcAddress() and not dlsym(), while + * ARM's Mali drivers interpreted GLES as intending that GLES3 + * functions were available only through dlsym() and not + * eglGetProcAddress(). Thanks, Khronos. + */ +void * +epoxy_gles3_dlsym(const char *name) +{ + if (epoxy_current_context_is_glx()) { + return epoxy_get_proc_address(name); + } else { + if (get_dlopen_handle(&api.gles2_handle, GLES2_LIB, false, true)) { + void *func = do_dlsym(&api.gles2_handle, name, false); + + if (func) + return func; + } + + return epoxy_get_proc_address(name); + } +} + +/** + * Performs either the dlsym or glXGetProcAddress()-equivalent for + * core functions in desktop GL. + */ +void * +epoxy_get_core_proc_address(const char *name, int core_version) +{ +#ifdef _WIN32 + int core_symbol_support = 11; +#elif defined(__ANDROID__) + /** + * All symbols must be resolved through eglGetProcAddress + * on Android + */ + int core_symbol_support = 0; +#else + int core_symbol_support = 12; +#endif + + if (core_version <= core_symbol_support) { + return epoxy_gl_dlsym(name); + } else { + return epoxy_get_proc_address(name); + } +} + +#if PLATFORM_HAS_EGL +static EGLenum +epoxy_egl_get_current_gl_context_api(void) +{ + EGLint curapi; + + if (eglQueryContext(eglGetCurrentDisplay(), eglGetCurrentContext(), + EGL_CONTEXT_CLIENT_TYPE, &curapi) == EGL_FALSE) { + (void)eglGetError(); + return EGL_NONE; + } + + return (EGLenum) curapi; +} +#endif /* PLATFORM_HAS_EGL */ + +/** + * Performs the dlsym() for the core GL 1.0 functions that we use for + * determining version and extension support for deciding on dlsym + * versus glXGetProcAddress() for all other functions. + * + * This needs to succeed on implementations without GLX (since + * glGetString() and glGetIntegerv() are both in GLES1/2 as well, and + * at call time we don't know for sure what API they're trying to use + * without inspecting contexts ourselves). + */ +void * +epoxy_get_bootstrap_proc_address(const char *name) +{ + /* If we already have a library that links to libglapi loaded, + * use that. + */ +#if PLATFORM_HAS_GLX + if (api.glx_handle && glXGetCurrentContext()) + return epoxy_gl_dlsym(name); +#endif + + /* If epoxy hasn't loaded any API-specific library yet, try to + * figure out what API the context is using and use that library, + * since future calls will also use that API (this prevents a + * non-X11 ES2 context from loading a bunch of X11 junk). + */ +#if PLATFORM_HAS_EGL + get_dlopen_handle(&api.egl_handle, EGL_LIB, false, true); + if (api.egl_handle) { + int version = 0; + switch (epoxy_egl_get_current_gl_context_api()) { + case EGL_OPENGL_API: + return epoxy_gl_dlsym(name); + case EGL_OPENGL_ES_API: + if (eglQueryContext(eglGetCurrentDisplay(), + eglGetCurrentContext(), + EGL_CONTEXT_CLIENT_VERSION, + &version)) { + if (version >= 2) + return epoxy_gles2_dlsym(name); + else + return epoxy_gles1_dlsym(name); + } + } + } +#endif /* PLATFORM_HAS_EGL */ + + /* Fall back to GLX */ + return epoxy_gl_dlsym(name); +} + +void * +epoxy_get_proc_address(const char *name) +{ +#if PLATFORM_HAS_EGL + GLenum egl_api = EGL_NONE; + + if (!epoxy_current_context_is_glx()) + egl_api = epoxy_egl_get_current_gl_context_api(); + + switch (egl_api) { + case EGL_OPENGL_API: + case EGL_OPENGL_ES_API: + return eglGetProcAddress(name); + case EGL_NONE: + break; + } +#endif + +#if defined(_WIN32) + return wglGetProcAddress(name); +#elif defined(__APPLE__) + return epoxy_gl_dlsym(name); +#elif PLATFORM_HAS_GLX + if (epoxy_current_context_is_glx()) + return glXGetProcAddressARB((const GLubyte *)name); + assert(0 && "Couldn't find current GLX or EGL context.\n"); +#endif + + return NULL; +} + +WRAPPER_VISIBILITY (void) +WRAPPER(epoxy_glBegin)(GLenum primtype) +{ +#ifdef _WIN32 + InterlockedIncrement(&api.begin_count); +#else + pthread_mutex_lock(&api.mutex); + api.begin_count++; + pthread_mutex_unlock(&api.mutex); +#endif + + epoxy_glBegin_unwrapped(primtype); +} + +WRAPPER_VISIBILITY (void) +WRAPPER(epoxy_glEnd)(void) +{ + epoxy_glEnd_unwrapped(); + +#ifdef _WIN32 + InterlockedDecrement(&api.begin_count); +#else + pthread_mutex_lock(&api.mutex); + api.begin_count--; + pthread_mutex_unlock(&api.mutex); +#endif +} + +PFNGLBEGINPROC epoxy_glBegin = epoxy_glBegin_wrapped; +PFNGLENDPROC epoxy_glEnd = epoxy_glEnd_wrapped; + +epoxy_resolver_failure_handler_t epoxy_resolver_failure_handler; + +/** + * Sets the function that will be called every time Epoxy fails to + * resolve a symbol. + * + * @param handler The new handler function + * @return The previous handler function + */ +epoxy_resolver_failure_handler_t +epoxy_set_resolver_failure_handler(epoxy_resolver_failure_handler_t handler) +{ +#ifdef _WIN32 + return InterlockedExchangePointer((void**)&epoxy_resolver_failure_handler, + handler); +#else + epoxy_resolver_failure_handler_t old; + pthread_mutex_lock(&api.mutex); + old = epoxy_resolver_failure_handler; + epoxy_resolver_failure_handler = handler; + pthread_mutex_unlock(&api.mutex); + return old; +#endif +} |