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