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280 lines
8.3 KiB
280 lines
8.3 KiB
/*
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* Copyright © 2013 Intel Corporation
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*
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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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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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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 DEALINGS
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* IN THE SOFTWARE.
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*/
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/**
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* @file dispatch_common.c
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*
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* Implements common code shared by the generated GL/EGL/GLX dispatch code.
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*
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* A collection of some important specs on getting GL function pointers.
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*
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* From the linux GL ABI (http://www.opengl.org/registry/ABI/):
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*
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* "3.4. The libraries must export all OpenGL 1.2, GLU 1.3, GLX 1.3, and
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* ARB_multitexture entry points statically.
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*
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* 3.5. Because non-ARB extensions vary so widely and are constantly
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* increasing in number, it's infeasible to require that they all be
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* supported, and extensions can always be added to hardware drivers
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* after the base link libraries are released. These drivers are
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* dynamically loaded by libGL, so extensions not in the base
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* library must also be obtained dynamically.
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*
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* 3.6. To perform the dynamic query, libGL also must export an entry
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* point called
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*
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* void (*glXGetProcAddressARB(const GLubyte *))();
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*
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* The full specification of this function is available separately. It
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* takes the string name of a GL or GLX entry point and returns a pointer
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* to a function implementing that entry point. It is functionally
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* identical to the wglGetProcAddress query defined by the Windows OpenGL
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* library, except that the function pointers returned are context
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* independent, unlike the WGL query."
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*
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* From the EGL 1.4 spec:
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*
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* "Client API function pointers returned by eglGetProcAddress are
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* independent of the display and the currently bound client API context,
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* and may be used by any client API context which supports the extension.
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*
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* eglGetProcAddress may be queried for all of the following functions:
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*
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* • All EGL and client API extension functions supported by the
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* implementation (whether those extensions are supported by the current
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* client API context or not). This includes any mandatory OpenGL ES
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* extensions.
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*
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* eglGetProcAddress may not be queried for core (non-extension) functions
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* in EGL or client APIs 20 .
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*
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* For functions that are queryable with eglGetProcAddress,
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* implementations may choose to also export those functions statically
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* from the object libraries im- plementing those functions. However,
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* portable clients cannot rely on this behavior.
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*
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* From the GLX 1.4 spec:
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*
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* "glXGetProcAddress may be queried for all of the following functions:
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*
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* • All GL and GLX extension functions supported by the implementation
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* (whether those extensions are supported by the current context or
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* not).
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*
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* • All core (non-extension) functions in GL and GLX from version 1.0 up
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* to and including the versions of those specifications supported by
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* the implementation, as determined by glGetString(GL VERSION) and
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* glXQueryVersion queries."
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*/
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#include <assert.h>
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#include <stdlib.h>
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#include <dlfcn.h>
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#include <string.h>
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#include <ctype.h>
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#include <stdio.h>
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#include "epoxy/gl.h"
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#include "epoxy/glx.h"
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#include "dispatch_common.h"
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/* XXX: Make this thread local */
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struct api local_api;
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struct api *api = &local_api;
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PUBLIC bool
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epoxy_is_desktop_gl(void)
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{
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const char *es_prefix = "OpenGL ES ";
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const char *version = (const char *)glGetString(GL_VERSION);
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return strncmp(es_prefix, version, strlen(es_prefix));
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}
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PUBLIC int
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epoxy_gl_version(void)
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{
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const char *version = (const char *)glGetString(GL_VERSION);
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GLint major, minor;
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int scanf_count;
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/* skip to version number */
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while (!isdigit(*version) && *version != '\0')
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version++;
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/* Interpret version number */
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scanf_count = sscanf(version, "%i.%i", &major, &minor);
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if (scanf_count != 2) {
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fprintf(stderr, "Unable to interpret GL_VERSION string: %s\n",
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version);
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exit(1);
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}
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return 10 * major + minor;
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}
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PUBLIC bool
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epoxy_is_glx(void)
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{
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return true; /* XXX */
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}
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/**
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* If we can determine the GLX version from the current context, then
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* return that, otherwise return a version that will just send us on
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* to dlsym() or get_proc_address().
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*/
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int
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epoxy_conservative_glx_version(void)
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{
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Display *dpy = glXGetCurrentDisplay();
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GLXContext ctx = glXGetCurrentContext();
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int screen;
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if (!dpy || !ctx)
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return 14;
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glXQueryContext(dpy, ctx, GLX_SCREEN, &screen);
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return epoxy_glx_version(dpy, screen);
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}
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PUBLIC int
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epoxy_glx_version(Display *dpy, int screen)
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{
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int server_major, server_minor;
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int client_major, client_minor;
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int server, client;
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const char *version_string;
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int ret;
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version_string = glXQueryServerString(dpy, screen, GLX_VERSION);
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ret = sscanf(version_string, "%d.%d", &server_major, &server_minor);
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assert(ret == 2);
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server = server_major * 10 + server_minor;
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version_string = glXGetClientString(dpy, GLX_VERSION);
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ret = sscanf(version_string, "%d.%d", &client_major, &client_minor);
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assert(ret == 2);
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client = client_major * 10 + client_minor;
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if (client < server)
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return client;
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else
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return server;
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}
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static bool
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epoxy_extension_in_string(const char *extension_list, const char *ext)
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{
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const char *ptr = extension_list;
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int len = strlen(ext);
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/* Make sure that don't just find an extension with our name as a prefix. */
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do {
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ptr = strstr(ptr, ext);
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} while (ptr && (ptr[len] != ' ' && ptr[len] != 0));
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return ptr != NULL;
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}
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PUBLIC bool
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epoxy_has_gl_extension(const char *ext)
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{
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return epoxy_extension_in_string((const char *)glGetString(GL_EXTENSIONS),
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ext);
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}
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#if 0
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PUBLIC bool
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epoxy_has_egl_extension(const char *ext)
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{
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return epoxy_extension_in_string(eglQueryString(EGL_EXTENSIONS), ext);
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}
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#endif
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PUBLIC bool
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epoxy_has_glx_extension(const char *ext)
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{
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Display *dpy = glXGetCurrentDisplay();
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int screen = 0;
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if (!dpy) {
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fprintf(stderr, "waffle needs a display!"); /* XXX */
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return false;
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}
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/* No, you can't just use glXGetClientString or
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* glXGetServerString() here. Those each tell you about one half
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* of what's needed for an extension to be supported, and
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* glXQueryExtensionsString() is what gives you the intersection
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* of the two.
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*/
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return epoxy_extension_in_string(glXQueryExtensionsString(dpy, screen), ext);
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}
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void *
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epoxy_dlsym(const char *name)
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{
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assert(api->gl_handle);
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return dlsym(api->gl_handle, name);
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}
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void *
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epoxy_get_proc_address(const char *name)
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{
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return glXGetProcAddress((const GLubyte *)name);
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}
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void
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epoxy_glx_autoinit(void)
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{
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if (api->gl_handle)
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return;
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api->gl_handle = dlopen("libGL.so.1", RTLD_LAZY | RTLD_LOCAL);
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if (!api->gl_handle) {
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fprintf(stderr, "Couldn't open libGL.so.1: %s", dlerror());
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exit(1);
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}
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api->winsys_handle = api->gl_handle;
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}
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void
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epoxy_platform_autoinit(void)
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{
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epoxy_glx_autoinit();
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}
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void
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epoxy_print_failure_reasons(const char *name,
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const char **provider_names,
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const int *providers)
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{
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int i;
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printf("No provider of %s found. Requires one of:\n", name);
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for (i = 0; providers[i] != 0; i++)
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puts(provider_names[providers[i]]);
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}
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