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 "qemu/drm.h"
  19 #include "qemu/error-report.h"
  20 #include "ui/console.h"
  21 #include "ui/egl-helpers.h"
  22 #include "sysemu/sysemu.h"
  23 #include "qapi/error.h"
  24
  25 EGLDisplay *qemu_egl_display;
  26 EGLConfig qemu_egl_config;
  27 DisplayGLMode qemu_egl_mode;
  28
  29 /* ------------------------------------------------------------------ */
  30
  31 const char *qemu_egl_get_error_string(void)
  32 {
  33     EGLint error = eglGetError();
  34
  35     switch (error) {
  36     case EGL_SUCCESS:
  37         return "EGL_SUCCESS";
  38     case EGL_NOT_INITIALIZED:
  39         return "EGL_NOT_INITIALIZED";
  40     case EGL_BAD_ACCESS:
  41         return "EGL_BAD_ACCESS";
  42     case EGL_BAD_ALLOC:
  43         return "EGL_BAD_ALLOC";
  44     case EGL_BAD_ATTRIBUTE:
  45         return "EGL_BAD_ATTRIBUTE";
  46     case EGL_BAD_CONTEXT:
  47         return "EGL_BAD_CONTEXT";
  48     case EGL_BAD_CONFIG:
  49         return "EGL_BAD_CONFIG";
  50     case EGL_BAD_CURRENT_SURFACE:
  51         return "EGL_BAD_CURRENT_SURFACE";
  52     case EGL_BAD_DISPLAY:
  53         return "EGL_BAD_DISPLAY";
  54     case EGL_BAD_SURFACE:
  55         return "EGL_BAD_SURFACE";
  56     case EGL_BAD_MATCH:
  57         return "EGL_BAD_MATCH";
  58     case EGL_BAD_PARAMETER:
  59         return "EGL_BAD_PARAMETER";
  60     case EGL_BAD_NATIVE_PIXMAP:
  61         return "EGL_BAD_NATIVE_PIXMAP";
  62     case EGL_BAD_NATIVE_WINDOW:
  63         return "EGL_BAD_NATIVE_WINDOW";
  64     case EGL_CONTEXT_LOST:
  65         return "EGL_CONTEXT_LOST";
  66     default:
  67         return "Unknown EGL error";
  68     }
  69 }
  70
  71 static void egl_fb_delete_texture(egl_fb *fb)
  72 {
  73     if (!fb->delete_texture) {
  74         return;
  75     }
  76
  77     glDeleteTextures(1, &fb->texture);
  78     fb->delete_texture = false;
  79 }
  80
  81 void egl_fb_destroy(egl_fb *fb)
  82 {
  83     if (!fb->framebuffer) {
  84         return;
  85     }
  86
  87     egl_fb_delete_texture(fb);
  88     glDeleteFramebuffers(1, &fb->framebuffer);
  89
  90     fb->width = 0;
  91     fb->height = 0;
  92     fb->texture = 0;
  93     fb->framebuffer = 0;
  94 }
  95
  96 void egl_fb_setup_default(egl_fb *fb, int width, int height)
  97 {
  98     fb->width = width;
  99     fb->height = height;
 100     fb->framebuffer = 0; /* default framebuffer */
 101 }
 102
 103 void egl_fb_setup_for_tex(egl_fb *fb, int width, int height,
 104                           GLuint texture, bool delete)
 105 {
 106     egl_fb_delete_texture(fb);
 107
 108     fb->width = width;
 109     fb->height = height;
 110     fb->texture = texture;
 111     fb->delete_texture = delete;
 112     if (!fb->framebuffer) {
 113         glGenFramebuffers(1, &fb->framebuffer);
 114     }
 115
 116     glBindFramebuffer(GL_FRAMEBUFFER_EXT, fb->framebuffer);
 117     glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
 118                               GL_TEXTURE_2D, fb->texture, 0);
 119 }
 120
 121 void egl_fb_setup_new_tex(egl_fb *fb, int width, int height)
 122 {
 123     GLuint texture;
 124
 125     glGenTextures(1, &texture);
 126     glBindTexture(GL_TEXTURE_2D, texture);
 127     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height,
 128                  0, GL_BGRA, GL_UNSIGNED_BYTE, 0);
 129
 130     egl_fb_setup_for_tex(fb, width, height, texture, true);
 131 }
 132
 133 void egl_fb_blit(egl_fb *dst, egl_fb *src, bool flip)
 134 {
 135     GLuint x1 = 0;
 136     GLuint y1 = 0;
 137     GLuint x2, y2;
 138     GLuint w = src->width;
 139     GLuint h = src->height;
 140
 141     glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer);
 142     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, dst->framebuffer);
 143     glViewport(0, 0, dst->width, dst->height);
 144
 145     if (src->dmabuf) {
 146         x1 = src->dmabuf->x;
 147         y1 = src->dmabuf->y;
 148         w = src->dmabuf->scanout_width;
 149         h = src->dmabuf->scanout_height;
 150     }
 151
 152     w = (x1 + w) > src->width ? src->width - x1 : w;
 153     h = (y1 + h) > src->height ? src->height - y1 : h;
 154
 155     y2 = flip ? y1 : h + y1;
 156     y1 = flip ? h + y1 : y1;
 157     x2 = x1 + w;
 158
 159     glBlitFramebuffer(x1, y1, x2, y2,
 160                       0, 0, dst->width, dst->height,
 161                       GL_COLOR_BUFFER_BIT, GL_LINEAR);
 162 }
 163
 164 void egl_fb_read(DisplaySurface *dst, egl_fb *src)
 165 {
 166     glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer);
 167     glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
 168     glReadPixels(0, 0, surface_width(dst), surface_height(dst),
 169                  GL_BGRA, GL_UNSIGNED_BYTE, surface_data(dst));
 170 }
 171
 172 void egl_texture_blit(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip)
 173 {
 174     glBindFramebuffer(GL_FRAMEBUFFER_EXT, dst->framebuffer);
 175     glViewport(0, 0, dst->width, dst->height);
 176     glEnable(GL_TEXTURE_2D);
 177     glBindTexture(GL_TEXTURE_2D, src->texture);
 178     qemu_gl_run_texture_blit(gls, flip);
 179 }
 180
 181 void egl_texture_blend(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip,
 182                        int x, int y, double scale_x, double scale_y)
 183 {
 184     glBindFramebuffer(GL_FRAMEBUFFER_EXT, dst->framebuffer);
 185     int w = scale_x * src->width;
 186     int h = scale_y * src->height;
 187     if (flip) {
 188         glViewport(x, y, w, h);
 189     } else {
 190         glViewport(x, dst->height - h - y, w, h);
 191     }
 192     glEnable(GL_TEXTURE_2D);
 193     glBindTexture(GL_TEXTURE_2D, src->texture);
 194     glEnable(GL_BLEND);
 195     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 196     qemu_gl_run_texture_blit(gls, flip);
 197     glDisable(GL_BLEND);
 198 }
 199
 200 /* ---------------------------------------------------------------------- */
 201
 202 EGLContext qemu_egl_rn_ctx;
 203
 204 #ifdef CONFIG_GBM
 205
 206 int qemu_egl_rn_fd;
 207 struct gbm_device *qemu_egl_rn_gbm_dev;
 208
 209 int egl_rendernode_init(const char *rendernode, DisplayGLMode mode)
 210 {
 211     qemu_egl_rn_fd = -1;
 212     int rc;
 213
 214     qemu_egl_rn_fd = qemu_drm_rendernode_open(rendernode);
 215     if (qemu_egl_rn_fd == -1) {
 216         error_report("egl: no drm render node available");
 217         goto err;
 218     }
 219
 220     qemu_egl_rn_gbm_dev = gbm_create_device(qemu_egl_rn_fd);
 221     if (!qemu_egl_rn_gbm_dev) {
 222         error_report("egl: gbm_create_device failed");
 223         goto err;
 224     }
 225
 226     rc = qemu_egl_init_dpy_mesa((EGLNativeDisplayType)qemu_egl_rn_gbm_dev,
 227                                 mode);
 228     if (rc != 0) {
 229         /* qemu_egl_init_dpy_mesa reports error */
 230         goto err;
 231     }
 232
 233     if (!epoxy_has_egl_extension(qemu_egl_display,
 234                                  "EGL_KHR_surfaceless_context")) {
 235         error_report("egl: EGL_KHR_surfaceless_context not supported");
 236         goto err;
 237     }
 238     if (!epoxy_has_egl_extension(qemu_egl_display,
 239                                  "EGL_MESA_image_dma_buf_export")) {
 240         error_report("egl: EGL_MESA_image_dma_buf_export not supported");
 241         goto err;
 242     }
 243
 244     qemu_egl_rn_ctx = qemu_egl_init_ctx();
 245     if (!qemu_egl_rn_ctx) {
 246         error_report("egl: egl_init_ctx failed");
 247         goto err;
 248     }
 249
 250     return 0;
 251
 252 err:
 253     if (qemu_egl_rn_gbm_dev) {
 254         gbm_device_destroy(qemu_egl_rn_gbm_dev);
 255     }
 256     if (qemu_egl_rn_fd != -1) {
 257         close(qemu_egl_rn_fd);
 258     }
 259
 260     return -1;
 261 }
 262
 263 int egl_get_fd_for_texture(uint32_t tex_id, EGLint *stride, EGLint *fourcc,
 264                            EGLuint64KHR *modifier)
 265 {
 266     EGLImageKHR image;
 267     EGLint num_planes, fd;
 268
 269     image = eglCreateImageKHR(qemu_egl_display, eglGetCurrentContext(),
 270                               EGL_GL_TEXTURE_2D_KHR,
 271                               (EGLClientBuffer)(unsigned long)tex_id,
 272                               NULL);
 273     if (!image) {
 274         return -1;
 275     }
 276
 277     eglExportDMABUFImageQueryMESA(qemu_egl_display, image, fourcc,
 278                                   &num_planes, modifier);
 279     if (num_planes != 1) {
 280         eglDestroyImageKHR(qemu_egl_display, image);
 281         return -1;
 282     }
 283     eglExportDMABUFImageMESA(qemu_egl_display, image, &fd, stride, NULL);
 284     eglDestroyImageKHR(qemu_egl_display, image);
 285
 286     return fd;
 287 }
 288
 289 void egl_dmabuf_import_texture(QemuDmaBuf *dmabuf)
 290 {
 291     EGLImageKHR image = EGL_NO_IMAGE_KHR;
 292     EGLint attrs[64];
 293     int i = 0;
 294
 295     if (dmabuf->texture != 0) {
 296         return;
 297     }
 298
 299     attrs[i++] = EGL_WIDTH;
 300     attrs[i++] = dmabuf->width;
 301     attrs[i++] = EGL_HEIGHT;
 302     attrs[i++] = dmabuf->height;
 303     attrs[i++] = EGL_LINUX_DRM_FOURCC_EXT;
 304     attrs[i++] = dmabuf->fourcc;
 305
 306     attrs[i++] = EGL_DMA_BUF_PLANE0_FD_EXT;
 307     attrs[i++] = dmabuf->fd;
 308     attrs[i++] = EGL_DMA_BUF_PLANE0_PITCH_EXT;
 309     attrs[i++] = dmabuf->stride;
 310     attrs[i++] = EGL_DMA_BUF_PLANE0_OFFSET_EXT;
 311     attrs[i++] = 0;
 312 #ifdef EGL_DMA_BUF_PLANE0_MODIFIER_LO_EXT
 313     if (dmabuf->modifier) {
 314         attrs[i++] = EGL_DMA_BUF_PLANE0_MODIFIER_LO_EXT;
 315         attrs[i++] = (dmabuf->modifier >>  0) & 0xffffffff;
 316         attrs[i++] = EGL_DMA_BUF_PLANE0_MODIFIER_HI_EXT;
 317         attrs[i++] = (dmabuf->modifier >> 32) & 0xffffffff;
 318     }
 319 #endif
 320     attrs[i++] = EGL_NONE;
 321
 322     image = eglCreateImageKHR(qemu_egl_display,
 323                               EGL_NO_CONTEXT,
 324                               EGL_LINUX_DMA_BUF_EXT,
 325                               NULL, attrs);
 326     if (image == EGL_NO_IMAGE_KHR) {
 327         error_report("eglCreateImageKHR failed");
 328         return;
 329     }
 330
 331     glGenTextures(1, &dmabuf->texture);
 332     glBindTexture(GL_TEXTURE_2D, dmabuf->texture);
 333     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 334     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 335
 336     glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
 337     eglDestroyImageKHR(qemu_egl_display, image);
 338 }
 339
 340 void egl_dmabuf_release_texture(QemuDmaBuf *dmabuf)
 341 {
 342     if (dmabuf->texture == 0) {
 343         return;
 344     }
 345
 346     glDeleteTextures(1, &dmabuf->texture);
 347     dmabuf->texture = 0;
 348 }
 349
 350 void egl_dmabuf_create_sync(QemuDmaBuf *dmabuf)
 351 {
 352     EGLSyncKHR sync;
 353
 354     if (epoxy_has_egl_extension(qemu_egl_display,
 355                                 "EGL_KHR_fence_sync") &&
 356         epoxy_has_egl_extension(qemu_egl_display,
 357                                 "EGL_ANDROID_native_fence_sync")) {
 358         sync = eglCreateSyncKHR(qemu_egl_display,
 359                                 EGL_SYNC_NATIVE_FENCE_ANDROID, NULL);
 360         if (sync != EGL_NO_SYNC_KHR) {
 361             dmabuf->sync = sync;
 362         }
 363     }
 364 }
 365
 366 void egl_dmabuf_create_fence(QemuDmaBuf *dmabuf)
 367 {
 368     if (dmabuf->sync) {
 369         dmabuf->fence_fd = eglDupNativeFenceFDANDROID(qemu_egl_display,
 370                                                       dmabuf->sync);
 371         eglDestroySyncKHR(qemu_egl_display, dmabuf->sync);
 372         dmabuf->sync = NULL;
 373     }
 374 }
 375
 376 #endif /* CONFIG_GBM */
 377
 378 /* ---------------------------------------------------------------------- */
 379
 380 EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, EGLNativeWindowType win)
 381 {
 382     EGLSurface esurface;
 383     EGLBoolean b;
 384
 385     esurface = eglCreateWindowSurface(qemu_egl_display,
 386                                       qemu_egl_config,
 387                                       win, NULL);
 388     if (esurface == EGL_NO_SURFACE) {
 389         error_report("egl: eglCreateWindowSurface failed");
 390         return NULL;
 391     }
 392
 393     b = eglMakeCurrent(qemu_egl_display, esurface, esurface, ectx);
 394     if (b == EGL_FALSE) {
 395         error_report("egl: eglMakeCurrent failed");
 396         return NULL;
 397     }
 398
 399     return esurface;
 400 }
 401
 402 /* ---------------------------------------------------------------------- */
 403
 404 #if defined(CONFIG_X11) || defined(CONFIG_GBM) || defined(WIN32)
 405
 406 /*
 407  * Taken from glamor_egl.h from the Xorg xserver, which is MIT licensed
 408  *
 409  * Create an EGLDisplay from a native display type. This is a little quirky
 410  * for a few reasons.
 411  *
 412  * 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to
 413  * use, but have different function signatures in the third argument; this
 414  * happens not to matter for us, at the moment, but it means epoxy won't alias
 415  * them together.
 416  *
 417  * 2: epoxy 1.3 and earlier don't understand EGL client extensions, which
 418  * means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver
 419  * will crash.
 420  *
 421  * 3: You can't tell whether you have EGL 1.5 at this point, because
 422  * eglQueryString(EGL_VERSION) is a property of the display, which we don't
 423  * have yet. So you have to query for extensions no matter what. Fortunately
 424  * epoxy_has_egl_extension _does_ let you query for client extensions, so
 425  * we don't have to write our own extension string parsing.
 426  *
 427  * 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one
 428  * needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay
 429  * function pointer.
 430  * We can workaround this (circular dependency) by probing for the EGL 1.5
 431  * platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem
 432  * like mesa will be able to advertise these (even though it can do EGL 1.5).
 433  */
 434 static EGLDisplay qemu_egl_get_display(EGLNativeDisplayType native,
 435                                        EGLenum platform)
 436 {
 437     EGLDisplay dpy = EGL_NO_DISPLAY;
 438
 439     /* In practise any EGL 1.5 implementation would support the EXT extension */
 440     if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
 441         if (platform != 0) {
 442             dpy = eglGetPlatformDisplayEXT(platform, native, NULL);
 443         }
 444     }
 445
 446     if (dpy == EGL_NO_DISPLAY) {
 447         /* fallback */
 448         dpy = eglGetDisplay(native);
 449     }
 450     return dpy;
 451 }
 452
 453 static int qemu_egl_init_dpy(EGLNativeDisplayType dpy,
 454                              EGLenum platform,
 455                              DisplayGLMode mode)
 456 {
 457     static const EGLint conf_att_core[] = {
 458         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 459         EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
 460         EGL_RED_SIZE,   5,
 461         EGL_GREEN_SIZE, 5,
 462         EGL_BLUE_SIZE,  5,
 463         EGL_ALPHA_SIZE, 0,
 464         EGL_NONE,
 465     };
 466     static const EGLint conf_att_gles[] = {
 467         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 468         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
 469         EGL_RED_SIZE,   5,
 470         EGL_GREEN_SIZE, 5,
 471         EGL_BLUE_SIZE,  5,
 472         EGL_ALPHA_SIZE, 0,
 473         EGL_NONE,
 474     };
 475     EGLint major, minor;
 476     EGLBoolean b;
 477     EGLint n;
 478     bool gles = (mode == DISPLAYGL_MODE_ES);
 479
 480     qemu_egl_display = qemu_egl_get_display(dpy, platform);
 481     if (qemu_egl_display == EGL_NO_DISPLAY) {
 482         error_report("egl: eglGetDisplay failed: %s", qemu_egl_get_error_string());
 483         return -1;
 484     }
 485
 486     b = eglInitialize(qemu_egl_display, &major, &minor);
 487     if (b == EGL_FALSE) {
 488         error_report("egl: eglInitialize failed: %s", qemu_egl_get_error_string());
 489         return -1;
 490     }
 491
 492     b = eglBindAPI(gles ?  EGL_OPENGL_ES_API : EGL_OPENGL_API);
 493     if (b == EGL_FALSE) {
 494         error_report("egl: eglBindAPI failed (%s mode): %s",
 495                      gles ? "gles" : "core", qemu_egl_get_error_string());
 496         return -1;
 497     }
 498
 499     b = eglChooseConfig(qemu_egl_display,
 500                         gles ? conf_att_gles : conf_att_core,
 501                         &qemu_egl_config, 1, &n);
 502     if (b == EGL_FALSE || n != 1) {
 503         error_report("egl: eglChooseConfig failed (%s mode): %s",
 504                      gles ? "gles" : "core", qemu_egl_get_error_string());
 505         return -1;
 506     }
 507
 508     qemu_egl_mode = gles ? DISPLAYGL_MODE_ES : DISPLAYGL_MODE_CORE;
 509     return 0;
 510 }
 511
 512 #endif
 513
 514 #if defined(CONFIG_X11) || defined(CONFIG_GBM)
 515 int qemu_egl_init_dpy_x11(EGLNativeDisplayType dpy, DisplayGLMode mode)
 516 {
 517 #ifdef EGL_KHR_platform_x11
 518     return qemu_egl_init_dpy(dpy, EGL_PLATFORM_X11_KHR, mode);
 519 #else
 520     return qemu_egl_init_dpy(dpy, 0, mode);
 521 #endif
 522 }
 523
 524 int qemu_egl_init_dpy_mesa(EGLNativeDisplayType dpy, DisplayGLMode mode)
 525 {
 526 #ifdef EGL_MESA_platform_gbm
 527     return qemu_egl_init_dpy(dpy, EGL_PLATFORM_GBM_MESA, mode);
 528 #else
 529     return qemu_egl_init_dpy(dpy, 0, mode);
 530 #endif
 531 }
 532 #endif
 533
 534
 535 #ifdef WIN32
 536 int qemu_egl_init_dpy_win32(EGLNativeDisplayType dpy, DisplayGLMode mode)
 537 {
 538     return qemu_egl_init_dpy(dpy, 0, mode);
 539 }
 540 #endif
 541
 542 bool qemu_egl_has_dmabuf(void)
 543 {
 544     if (qemu_egl_display == EGL_NO_DISPLAY) {
 545         return false;
 546     }
 547
 548     return epoxy_has_egl_extension(qemu_egl_display,
 549                                    "EGL_EXT_image_dma_buf_import");
 550 }
 551
 552 EGLContext qemu_egl_init_ctx(void)
 553 {
 554     static const EGLint ctx_att_core[] = {
 555         EGL_CONTEXT_OPENGL_PROFILE_MASK, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT,
 556         EGL_NONE
 557     };
 558     static const EGLint ctx_att_gles[] = {
 559         EGL_CONTEXT_CLIENT_VERSION, 2,
 560         EGL_NONE
 561     };
 562     bool gles = (qemu_egl_mode == DISPLAYGL_MODE_ES);
 563     EGLContext ectx;
 564     EGLBoolean b;
 565
 566     ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
 567                             gles ? ctx_att_gles : ctx_att_core);
 568     if (ectx == EGL_NO_CONTEXT) {
 569         error_report("egl: eglCreateContext failed");
 570         return NULL;
 571     }
 572
 573     b = eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, ectx);
 574     if (b == EGL_FALSE) {
 575         error_report("egl: eglMakeCurrent failed");
 576         return NULL;
 577     }
 578
 579     return ectx;
 580 }
 581
 582 bool egl_init(const char *rendernode, DisplayGLMode mode, Error **errp)
 583 {
 584     ERRP_GUARD();
 585
 586     if (mode == DISPLAYGL_MODE_OFF) {
 587         error_setg(errp, "egl: turning off GL doesn't make sense");
 588         return false;
 589     }
 590
 591 #ifdef WIN32
 592     if (qemu_egl_init_dpy_win32(EGL_DEFAULT_DISPLAY, mode) < 0) {
 593         error_setg(errp, "egl: init failed");
 594         return false;
 595     }
 596     qemu_egl_rn_ctx = qemu_egl_init_ctx();
 597     if (!qemu_egl_rn_ctx) {
 598         error_setg(errp, "egl: egl_init_ctx failed");
 599         return false;
 600     }
 601 #elif defined(CONFIG_GBM)
 602     if (egl_rendernode_init(rendernode, mode) < 0) {
 603         error_setg(errp, "egl: render node init failed");
 604         return false;
 605     }
 606 #endif
 607
 608     if (!qemu_egl_rn_ctx) {
 609         error_setg(errp, "egl: not available on this platform");
 610         return false;
 611     }
 612
 613     display_opengl = 1;
 614     return true;
 615 }