ui/egl-helpers.c

   1 /*
   2  * Copyright (C) 2015-2016 Gerd Hoffmann <kraxel@redhat.com>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17 #include "qemu/osdep.h"
  18 #include <glob.h>
  19 #include <dirent.h>
  20
  21 #include "qemu/error-report.h"
  22 #include "ui/egl-helpers.h"
  23
  24 EGLDisplay *qemu_egl_display;
  25 EGLConfig qemu_egl_config;
  26
  27 /* ---------------------------------------------------------------------- */
  28
  29 static bool egl_gles;
  30 static int egl_debug;
  31
  32 #define egl_dbg(_x ...)                          \
  33     do {                                         \
  34         if (egl_debug) {                         \
  35             fprintf(stderr, "egl: " _x);         \
  36         }                                        \
  37     } while (0);
  38
  39 /* ---------------------------------------------------------------------- */
  40
  41 #ifdef CONFIG_OPENGL_DMABUF
  42
  43 int qemu_egl_rn_fd;
  44 struct gbm_device *qemu_egl_rn_gbm_dev;
  45 EGLContext qemu_egl_rn_ctx;
  46
  47 int qemu_egl_rendernode_open(void)
  48 {
  49     DIR *dir;
  50     struct dirent *e;
  51     int r, fd;
  52     char *p;
  53
  54     dir = opendir("/dev/dri");
  55     if (!dir) {
  56         return -1;
  57     }
  58
  59     fd = -1;
  60     while ((e = readdir(dir))) {
  61         if (e->d_type != DT_CHR) {
  62             continue;
  63         }
  64
  65         if (strncmp(e->d_name, "renderD", 7)) {
  66             continue;
  67         }
  68
  69         p = g_strdup_printf("/dev/dri/%s", e->d_name);
  70
  71         r = open(p, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
  72         if (r < 0) {
  73             g_free(p);
  74             continue;
  75         }
  76         fd = r;
  77         g_free(p);
  78         break;
  79     }
  80
  81     closedir(dir);
  82     if (fd < 0) {
  83         return -1;
  84     }
  85     return fd;
  86 }
  87
  88 int egl_rendernode_init(void)
  89 {
  90     qemu_egl_rn_fd = -1;
  91
  92     qemu_egl_rn_fd = qemu_egl_rendernode_open();
  93     if (qemu_egl_rn_fd == -1) {
  94         error_report("egl: no drm render node available");
  95         goto err;
  96     }
  97
  98     qemu_egl_rn_gbm_dev = gbm_create_device(qemu_egl_rn_fd);
  99     if (!qemu_egl_rn_gbm_dev) {
 100         error_report("egl: gbm_create_device failed");
 101         goto err;
 102     }
 103
 104     qemu_egl_init_dpy((EGLNativeDisplayType)qemu_egl_rn_gbm_dev, false, false);
 105
 106     if (!epoxy_has_egl_extension(qemu_egl_display,
 107                                  "EGL_KHR_surfaceless_context")) {
 108         error_report("egl: EGL_KHR_surfaceless_context not supported");
 109         goto err;
 110     }
 111     if (!epoxy_has_egl_extension(qemu_egl_display,
 112                                  "EGL_MESA_image_dma_buf_export")) {
 113         error_report("egl: EGL_MESA_image_dma_buf_export not supported");
 114         goto err;
 115     }
 116
 117     qemu_egl_rn_ctx = qemu_egl_init_ctx();
 118     if (!qemu_egl_rn_ctx) {
 119         error_report("egl: egl_init_ctx failed");
 120         goto err;
 121     }
 122
 123     return 0;
 124
 125 err:
 126     if (qemu_egl_rn_gbm_dev) {
 127         gbm_device_destroy(qemu_egl_rn_gbm_dev);
 128     }
 129     if (qemu_egl_rn_fd != -1) {
 130         close(qemu_egl_rn_fd);
 131     }
 132
 133     return -1;
 134 }
 135
 136 int egl_get_fd_for_texture(uint32_t tex_id, EGLint *stride, EGLint *fourcc)
 137 {
 138     EGLImageKHR image;
 139     EGLint num_planes, fd;
 140
 141     image = eglCreateImageKHR(qemu_egl_display, eglGetCurrentContext(),
 142                               EGL_GL_TEXTURE_2D_KHR,
 143                               (EGLClientBuffer)(unsigned long)tex_id,
 144                               NULL);
 145     if (!image) {
 146         return -1;
 147     }
 148
 149     eglExportDMABUFImageQueryMESA(qemu_egl_display, image, fourcc,
 150                                   &num_planes, NULL);
 151     if (num_planes != 1) {
 152         eglDestroyImageKHR(qemu_egl_display, image);
 153         return -1;
 154     }
 155     eglExportDMABUFImageMESA(qemu_egl_display, image, &fd, stride, NULL);
 156     eglDestroyImageKHR(qemu_egl_display, image);
 157
 158     return fd;
 159 }
 160
 161 #endif /* CONFIG_OPENGL_DMABUF */
 162
 163 /* ---------------------------------------------------------------------- */
 164
 165 EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, Window win)
 166 {
 167     EGLSurface esurface;
 168     EGLBoolean b;
 169
 170     egl_dbg("eglCreateWindowSurface (x11 win id 0x%lx) ...\n",
 171             (unsigned long) win);
 172     esurface = eglCreateWindowSurface(qemu_egl_display,
 173                                       qemu_egl_config,
 174                                       (EGLNativeWindowType)win, NULL);
 175     if (esurface == EGL_NO_SURFACE) {
 176         error_report("egl: eglCreateWindowSurface failed");
 177         return NULL;
 178     }
 179
 180     b = eglMakeCurrent(qemu_egl_display, esurface, esurface, ectx);
 181     if (b == EGL_FALSE) {
 182         error_report("egl: eglMakeCurrent failed");
 183         return NULL;
 184     }
 185
 186     return esurface;
 187 }
 188
 189 /* ---------------------------------------------------------------------- */
 190
 191 int qemu_egl_init_dpy(EGLNativeDisplayType dpy, bool gles, bool debug)
 192 {
 193     static const EGLint conf_att_gl[] = {
 194         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 195         EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
 196         EGL_RED_SIZE,   5,
 197         EGL_GREEN_SIZE, 5,
 198         EGL_BLUE_SIZE,  5,
 199         EGL_ALPHA_SIZE, 0,
 200         EGL_NONE,
 201     };
 202     static const EGLint conf_att_gles[] = {
 203         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 204         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
 205         EGL_RED_SIZE,   5,
 206         EGL_GREEN_SIZE, 5,
 207         EGL_BLUE_SIZE,  5,
 208         EGL_ALPHA_SIZE, 0,
 209         EGL_NONE,
 210     };
 211     EGLint major, minor;
 212     EGLBoolean b;
 213     EGLint n;
 214
 215     if (debug) {
 216         egl_debug = 1;
 217         setenv("EGL_LOG_LEVEL", "debug", true);
 218         setenv("LIBGL_DEBUG", "verbose", true);
 219     }
 220
 221     egl_dbg("eglGetDisplay (dpy %p) ...\n", dpy);
 222     qemu_egl_display = eglGetDisplay(dpy);
 223     if (qemu_egl_display == EGL_NO_DISPLAY) {
 224         error_report("egl: eglGetDisplay failed");
 225         return -1;
 226     }
 227
 228     egl_dbg("eglInitialize ...\n");
 229     b = eglInitialize(qemu_egl_display, &major, &minor);
 230     if (b == EGL_FALSE) {
 231         error_report("egl: eglInitialize failed");
 232         return -1;
 233     }
 234
 235     egl_dbg("eglBindAPI ...\n");
 236     b = eglBindAPI(gles ? EGL_OPENGL_ES_API : EGL_OPENGL_API);
 237     if (b == EGL_FALSE) {
 238         error_report("egl: eglBindAPI failed");
 239         return -1;
 240     }
 241
 242     egl_dbg("eglChooseConfig ...\n");
 243     b = eglChooseConfig(qemu_egl_display,
 244                         gles ? conf_att_gles : conf_att_gl,
 245                         &qemu_egl_config, 1, &n);
 246     if (b == EGL_FALSE || n != 1) {
 247         error_report("egl: eglChooseConfig failed");
 248         return -1;
 249     }
 250
 251     egl_gles = gles;
 252     return 0;
 253 }
 254
 255 EGLContext qemu_egl_init_ctx(void)
 256 {
 257     static const EGLint ctx_att_gl[] = {
 258         EGL_NONE
 259     };
 260     static const EGLint ctx_att_gles[] = {
 261         EGL_CONTEXT_CLIENT_VERSION, 2,
 262         EGL_NONE
 263     };
 264
 265     EGLContext ectx;
 266     EGLBoolean b;
 267
 268     egl_dbg("eglCreateContext ...\n");
 269     ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
 270                             egl_gles ? ctx_att_gles : ctx_att_gl);
 271     if (ectx == EGL_NO_CONTEXT) {
 272         error_report("egl: eglCreateContext failed");
 273         return NULL;
 274     }
 275
 276     b = eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, ectx);
 277     if (b == EGL_FALSE) {
 278         error_report("egl: eglMakeCurrent failed");
 279         return NULL;
 280     }
 281
 282     return ectx;
 283 }