glamor_egl.h (3204B)
1 /* 2 * Copyright © 2016 Red Hat, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 * DEALINGS IN THE SOFTWARE. 22 * 23 * Authors: 24 * Adam Jackson <ajax@redhat.com> 25 */ 26 27 #ifndef GLAMOR_EGL_H 28 #define GLAMOR_EGL_H 29 30 #define MESA_EGL_NO_X11_HEADERS 31 #define EGL_NO_X11 32 #include <epoxy/gl.h> 33 #include <epoxy/egl.h> 34 #include <glamor_egl_ext.h> 35 36 /* 37 * Create an EGLDisplay from a native display type. This is a little quirky 38 * for a few reasons. 39 * 40 * 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to 41 * use, but have different function signatures in the third argument; this 42 * happens not to matter for us, at the moment, but it means epoxy won't alias 43 * them together. 44 * 45 * 2: epoxy 1.3 and earlier don't understand EGL client extensions, which 46 * means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver 47 * will crash. 48 * 49 * 3: You can't tell whether you have EGL 1.5 at this point, because 50 * eglQueryString(EGL_VERSION) is a property of the display, which we don't 51 * have yet. So you have to query for extensions no matter what. Fortunately 52 * epoxy_has_egl_extension _does_ let you query for client extensions, so 53 * we don't have to write our own extension string parsing. 54 * 55 * 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one 56 * needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay 57 * function pointer. 58 * We can workaround this (circular dependency) by probing for the EGL 1.5 59 * platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem 60 * like mesa will be able to adverise these (even though it can do EGL 1.5). 61 */ 62 static inline EGLDisplay 63 glamor_egl_get_display(EGLint type, void *native) 64 { 65 /* In practise any EGL 1.5 implementation would support the EXT extension */ 66 if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) { 67 PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT = 68 (void *) eglGetProcAddress("eglGetPlatformDisplayEXT"); 69 if (getPlatformDisplayEXT) 70 return getPlatformDisplayEXT(type, native, NULL); 71 } 72 73 /* Welp, everything is awful. */ 74 return eglGetDisplay(native); 75 } 76 77 #endif