76 lines
3.1 KiB
C
76 lines
3.1 KiB
C
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/*
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* Copyright © 2016 Red Hat, Inc.
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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
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Adam Jackson <ajax@redhat.com>
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*/
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#ifndef GLAMOR_EGL_H
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#define GLAMOR_EGL_H
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#define MESA_EGL_NO_X11_HEADERS
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#include <epoxy/gl.h>
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#include <epoxy/egl.h>
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/*
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* Create an EGLDisplay from a native display type. This is a little quirky
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* for a few reasons.
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*
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* 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to
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* use, but have different function signatures in the third argument; this
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* happens not to matter for us, at the moment, but it means epoxy won't alias
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* them together.
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*
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* 2: epoxy 1.3 and earlier don't understand EGL client extensions, which
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* means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver
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* will crash.
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*
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* 3: You can't tell whether you have EGL 1.5 at this point, because
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* eglQueryString(EGL_VERSION) is a property of the display, which we don't
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* have yet. So you have to query for extensions no matter what. Fortunately
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* epoxy_has_egl_extension _does_ let you query for client extensions, so
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* we don't have to write our own extension string parsing.
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*
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* 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one
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* needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay
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* function pointer.
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* We can workaround this (circular dependency) by probing for the EGL 1.5
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* platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem
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* like mesa will be able to adverise these (even though it can do EGL 1.5).
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*/
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static inline EGLDisplay
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glamor_egl_get_display(EGLint type, void *native)
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{
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/* In practise any EGL 1.5 implementation would support the EXT extension */
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if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
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PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT =
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(void *) eglGetProcAddress("eglGetPlatformDisplayEXT");
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if (getPlatformDisplayEXT)
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return getPlatformDisplayEXT(type, native, NULL);
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}
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/* Welp, everything is awful. */
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return eglGetDisplay(native);
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}
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#endif
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