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 static int qemu_egl_rendernode_open(const char *rendernode)
  48 {
  49     DIR *dir;
  50     struct dirent *e;
  51     int r, fd;
  52     char *p;
  53
  54     if (rendernode) {
  55         return open(rendernode, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
  56     }
  57
  58     dir = opendir("/dev/dri");
  59     if (!dir) {
  60         return -1;
  61     }
  62
  63     fd = -1;
  64     while ((e = readdir(dir))) {
  65         if (e->d_type != DT_CHR) {
  66             continue;
  67         }
  68
  69         if (strncmp(e->d_name, "renderD", 7)) {
  70             continue;
  71         }
  72
  73         p = g_strdup_printf("/dev/dri/%s", e->d_name);
  74
  75         r = open(p, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
  76         if (r < 0) {
  77             g_free(p);
  78             continue;
  79         }
  80         fd = r;
  81         g_free(p);
  82         break;
  83     }
  84
  85     closedir(dir);
  86     if (fd < 0) {
  87         return -1;
  88     }
  89     return fd;
  90 }
  91
  92 int egl_rendernode_init(const char *rendernode)
  93 {
  94     qemu_egl_rn_fd = -1;
  95
  96     qemu_egl_rn_fd = qemu_egl_rendernode_open(rendernode);
  97     if (qemu_egl_rn_fd == -1) {
  98         error_report("egl: no drm render node available");
  99         goto err;
 100     }
 101
 102     qemu_egl_rn_gbm_dev = gbm_create_device(qemu_egl_rn_fd);
 103     if (!qemu_egl_rn_gbm_dev) {
 104         error_report("egl: gbm_create_device failed");
 105         goto err;
 106     }
 107
 108     qemu_egl_init_dpy((EGLNativeDisplayType)qemu_egl_rn_gbm_dev, false, false);
 109
 110     if (!epoxy_has_egl_extension(qemu_egl_display,
 111                                  "EGL_KHR_surfaceless_context")) {
 112         error_report("egl: EGL_KHR_surfaceless_context not supported");
 113         goto err;
 114     }
 115     if (!epoxy_has_egl_extension(qemu_egl_display,
 116                                  "EGL_MESA_image_dma_buf_export")) {
 117         error_report("egl: EGL_MESA_image_dma_buf_export not supported");
 118         goto err;
 119     }
 120
 121     qemu_egl_rn_ctx = qemu_egl_init_ctx();
 122     if (!qemu_egl_rn_ctx) {
 123         error_report("egl: egl_init_ctx failed");
 124         goto err;
 125     }
 126
 127     return 0;
 128
 129 err:
 130     if (qemu_egl_rn_gbm_dev) {
 131         gbm_device_destroy(qemu_egl_rn_gbm_dev);
 132     }
 133     if (qemu_egl_rn_fd != -1) {
 134         close(qemu_egl_rn_fd);
 135     }
 136
 137     return -1;
 138 }
 139
 140 int egl_get_fd_for_texture(uint32_t tex_id, EGLint *stride, EGLint *fourcc)
 141 {
 142     EGLImageKHR image;
 143     EGLint num_planes, fd;
 144
 145     image = eglCreateImageKHR(qemu_egl_display, eglGetCurrentContext(),
 146                               EGL_GL_TEXTURE_2D_KHR,
 147                               (EGLClientBuffer)(unsigned long)tex_id,
 148                               NULL);
 149     if (!image) {
 150         return -1;
 151     }
 152
 153     eglExportDMABUFImageQueryMESA(qemu_egl_display, image, fourcc,
 154                                   &num_planes, NULL);
 155     if (num_planes != 1) {
 156         eglDestroyImageKHR(qemu_egl_display, image);
 157         return -1;
 158     }
 159     eglExportDMABUFImageMESA(qemu_egl_display, image, &fd, stride, NULL);
 160     eglDestroyImageKHR(qemu_egl_display, image);
 161
 162     return fd;
 163 }
 164
 165 #endif /* CONFIG_OPENGL_DMABUF */
 166
 167 /* ---------------------------------------------------------------------- */
 168
 169 EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, Window win)
 170 {
 171     EGLSurface esurface;
 172     EGLBoolean b;
 173
 174     egl_dbg("eglCreateWindowSurface (x11 win id 0x%lx) ...\n",
 175             (unsigned long) win);
 176     esurface = eglCreateWindowSurface(qemu_egl_display,
 177                                       qemu_egl_config,
 178                                       (EGLNativeWindowType)win, NULL);
 179     if (esurface == EGL_NO_SURFACE) {
 180         error_report("egl: eglCreateWindowSurface failed");
 181         return NULL;
 182     }
 183
 184     b = eglMakeCurrent(qemu_egl_display, esurface, esurface, ectx);
 185     if (b == EGL_FALSE) {
 186         error_report("egl: eglMakeCurrent failed");
 187         return NULL;
 188     }
 189
 190     return esurface;
 191 }
 192
 193 /* ---------------------------------------------------------------------- */
 194
 195 int qemu_egl_init_dpy(EGLNativeDisplayType dpy, bool gles, bool debug)
 196 {
 197     static const EGLint conf_att_gl[] = {
 198         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 199         EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
 200         EGL_RED_SIZE,   5,
 201         EGL_GREEN_SIZE, 5,
 202         EGL_BLUE_SIZE,  5,
 203         EGL_ALPHA_SIZE, 0,
 204         EGL_NONE,
 205     };
 206     static const EGLint conf_att_gles[] = {
 207         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 208         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
 209         EGL_RED_SIZE,   5,
 210         EGL_GREEN_SIZE, 5,
 211         EGL_BLUE_SIZE,  5,
 212         EGL_ALPHA_SIZE, 0,
 213         EGL_NONE,
 214     };
 215     EGLint major, minor;
 216     EGLBoolean b;
 217     EGLint n;
 218
 219     if (debug) {
 220         egl_debug = 1;
 221         setenv("EGL_LOG_LEVEL", "debug", true);
 222         setenv("LIBGL_DEBUG", "verbose", true);
 223     }
 224
 225     egl_dbg("eglGetDisplay (dpy %p) ...\n", dpy);
 226 #ifdef EGL_MESA_platform_gbm
 227     qemu_egl_display = eglGetPlatformDisplayEXT(EGL_PLATFORM_GBM_MESA, dpy, NULL);
 228 #else
 229     qemu_egl_display = eglGetDisplay(dpy);
 230 #endif
 231     if (qemu_egl_display == EGL_NO_DISPLAY) {
 232         error_report("egl: eglGetDisplay failed");
 233         return -1;
 234     }
 235
 236     egl_dbg("eglInitialize ...\n");
 237     b = eglInitialize(qemu_egl_display, &major, &minor);
 238     if (b == EGL_FALSE) {
 239         error_report("egl: eglInitialize failed");
 240         return -1;
 241     }
 242
 243     egl_dbg("eglBindAPI ...\n");
 244     b = eglBindAPI(gles ? EGL_OPENGL_ES_API : EGL_OPENGL_API);
 245     if (b == EGL_FALSE) {
 246         error_report("egl: eglBindAPI failed");
 247         return -1;
 248     }
 249
 250     egl_dbg("eglChooseConfig ...\n");
 251     b = eglChooseConfig(qemu_egl_display,
 252                         gles ? conf_att_gles : conf_att_gl,
 253                         &qemu_egl_config, 1, &n);
 254     if (b == EGL_FALSE || n != 1) {
 255         error_report("egl: eglChooseConfig failed");
 256         return -1;
 257     }
 258
 259     egl_gles = gles;
 260     return 0;
 261 }
 262
 263 EGLContext qemu_egl_init_ctx(void)
 264 {
 265     static const EGLint ctx_att_gl[] = {
 266         EGL_NONE
 267     };
 268     static const EGLint ctx_att_gles[] = {
 269         EGL_CONTEXT_CLIENT_VERSION, 2,
 270         EGL_NONE
 271     };
 272
 273     EGLContext ectx;
 274     EGLBoolean b;
 275
 276     egl_dbg("eglCreateContext ...\n");
 277     ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
 278                             egl_gles ? ctx_att_gles : ctx_att_gl);
 279     if (ectx == EGL_NO_CONTEXT) {
 280         error_report("egl: eglCreateContext failed");
 281         return NULL;
 282     }
 283
 284     b = eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, ectx);
 285     if (b == EGL_FALSE) {
 286         error_report("egl: eglMakeCurrent failed");
 287         return NULL;
 288     }
 289
 290     return ectx;
 291 }