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_fb_read_rect(DisplaySurface *dst, egl_fb *src, int x, int y, int w, int h)
 173 {
 174     assert(surface_width(dst) == src->width);
 175     assert(surface_height(dst) == src->height);
 176     assert(surface_format(dst) == PIXMAN_x8r8g8b8);
 177
 178     glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer);
 179     glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
 180     glPixelStorei(GL_PACK_ROW_LENGTH, surface_stride(dst) / 4);
 181     glReadPixels(x, y, w, h,
 182                  GL_BGRA, GL_UNSIGNED_BYTE, surface_data(dst) + x * 4);
 183     glPixelStorei(GL_PACK_ROW_LENGTH, 0);
 184 }
 185
 186 void egl_texture_blit(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip)
 187 {
 188     glBindFramebuffer(GL_FRAMEBUFFER_EXT, dst->framebuffer);
 189     glViewport(0, 0, dst->width, dst->height);
 190     glEnable(GL_TEXTURE_2D);
 191     glBindTexture(GL_TEXTURE_2D, src->texture);
 192     qemu_gl_run_texture_blit(gls, flip);
 193 }
 194
 195 void egl_texture_blend(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip,
 196                        int x, int y, double scale_x, double scale_y)
 197 {
 198     glBindFramebuffer(GL_FRAMEBUFFER_EXT, dst->framebuffer);
 199     int w = scale_x * src->width;
 200     int h = scale_y * src->height;
 201     if (flip) {
 202         glViewport(x, y, w, h);
 203     } else {
 204         glViewport(x, dst->height - h - y, w, h);
 205     }
 206     glEnable(GL_TEXTURE_2D);
 207     glBindTexture(GL_TEXTURE_2D, src->texture);
 208     glEnable(GL_BLEND);
 209     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 210     qemu_gl_run_texture_blit(gls, flip);
 211     glDisable(GL_BLEND);
 212 }
 213
 214 /* ---------------------------------------------------------------------- */
 215
 216 EGLContext qemu_egl_rn_ctx;
 217
 218 #ifdef CONFIG_GBM
 219
 220 int qemu_egl_rn_fd;
 221 struct gbm_device *qemu_egl_rn_gbm_dev;
 222
 223 int egl_rendernode_init(const char *rendernode, DisplayGLMode mode)
 224 {
 225     qemu_egl_rn_fd = -1;
 226     int rc;
 227
 228     qemu_egl_rn_fd = qemu_drm_rendernode_open(rendernode);
 229     if (qemu_egl_rn_fd == -1) {
 230         error_report("egl: no drm render node available");
 231         goto err;
 232     }
 233
 234     qemu_egl_rn_gbm_dev = gbm_create_device(qemu_egl_rn_fd);
 235     if (!qemu_egl_rn_gbm_dev) {
 236         error_report("egl: gbm_create_device failed");
 237         goto err;
 238     }
 239
 240     rc = qemu_egl_init_dpy_mesa((EGLNativeDisplayType)qemu_egl_rn_gbm_dev,
 241                                 mode);
 242     if (rc != 0) {
 243         /* qemu_egl_init_dpy_mesa reports error */
 244         goto err;
 245     }
 246
 247     if (!epoxy_has_egl_extension(qemu_egl_display,
 248                                  "EGL_KHR_surfaceless_context")) {
 249         error_report("egl: EGL_KHR_surfaceless_context not supported");
 250         goto err;
 251     }
 252     if (!epoxy_has_egl_extension(qemu_egl_display,
 253                                  "EGL_MESA_image_dma_buf_export")) {
 254         error_report("egl: EGL_MESA_image_dma_buf_export not supported");
 255         goto err;
 256     }
 257
 258     qemu_egl_rn_ctx = qemu_egl_init_ctx();
 259     if (!qemu_egl_rn_ctx) {
 260         error_report("egl: egl_init_ctx failed");
 261         goto err;
 262     }
 263
 264     return 0;
 265
 266 err:
 267     if (qemu_egl_rn_gbm_dev) {
 268         gbm_device_destroy(qemu_egl_rn_gbm_dev);
 269     }
 270     if (qemu_egl_rn_fd != -1) {
 271         close(qemu_egl_rn_fd);
 272     }
 273
 274     return -1;
 275 }
 276
 277 int egl_get_fd_for_texture(uint32_t tex_id, EGLint *stride, EGLint *fourcc,
 278                            EGLuint64KHR *modifier)
 279 {
 280     EGLImageKHR image;
 281     EGLint num_planes, fd;
 282
 283     image = eglCreateImageKHR(qemu_egl_display, eglGetCurrentContext(),
 284                               EGL_GL_TEXTURE_2D_KHR,
 285                               (EGLClientBuffer)(unsigned long)tex_id,
 286                               NULL);
 287     if (!image) {
 288         return -1;
 289     }
 290
 291     eglExportDMABUFImageQueryMESA(qemu_egl_display, image, fourcc,
 292                                   &num_planes, modifier);
 293     if (num_planes != 1) {
 294         eglDestroyImageKHR(qemu_egl_display, image);
 295         return -1;
 296     }
 297     eglExportDMABUFImageMESA(qemu_egl_display, image, &fd, stride, NULL);
 298     eglDestroyImageKHR(qemu_egl_display, image);
 299
 300     return fd;
 301 }
 302
 303 void egl_dmabuf_import_texture(QemuDmaBuf *dmabuf)
 304 {
 305     EGLImageKHR image = EGL_NO_IMAGE_KHR;
 306     EGLint attrs[64];
 307     int i = 0;
 308
 309     if (dmabuf->texture != 0) {
 310         return;
 311     }
 312
 313     attrs[i++] = EGL_WIDTH;
 314     attrs[i++] = dmabuf->width;
 315     attrs[i++] = EGL_HEIGHT;
 316     attrs[i++] = dmabuf->height;
 317     attrs[i++] = EGL_LINUX_DRM_FOURCC_EXT;
 318     attrs[i++] = dmabuf->fourcc;
 319
 320     attrs[i++] = EGL_DMA_BUF_PLANE0_FD_EXT;
 321     attrs[i++] = dmabuf->fd;
 322     attrs[i++] = EGL_DMA_BUF_PLANE0_PITCH_EXT;
 323     attrs[i++] = dmabuf->stride;
 324     attrs[i++] = EGL_DMA_BUF_PLANE0_OFFSET_EXT;
 325     attrs[i++] = 0;
 326 #ifdef EGL_DMA_BUF_PLANE0_MODIFIER_LO_EXT
 327     if (dmabuf->modifier) {
 328         attrs[i++] = EGL_DMA_BUF_PLANE0_MODIFIER_LO_EXT;
 329         attrs[i++] = (dmabuf->modifier >>  0) & 0xffffffff;
 330         attrs[i++] = EGL_DMA_BUF_PLANE0_MODIFIER_HI_EXT;
 331         attrs[i++] = (dmabuf->modifier >> 32) & 0xffffffff;
 332     }
 333 #endif
 334     attrs[i++] = EGL_NONE;
 335
 336     image = eglCreateImageKHR(qemu_egl_display,
 337                               EGL_NO_CONTEXT,
 338                               EGL_LINUX_DMA_BUF_EXT,
 339                               NULL, attrs);
 340     if (image == EGL_NO_IMAGE_KHR) {
 341         error_report("eglCreateImageKHR failed");
 342         return;
 343     }
 344
 345     glGenTextures(1, &dmabuf->texture);
 346     glBindTexture(GL_TEXTURE_2D, dmabuf->texture);
 347     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 348     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 349
 350     glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
 351     eglDestroyImageKHR(qemu_egl_display, image);
 352 }
 353
 354 void egl_dmabuf_release_texture(QemuDmaBuf *dmabuf)
 355 {
 356     if (dmabuf->texture == 0) {
 357         return;
 358     }
 359
 360     glDeleteTextures(1, &dmabuf->texture);
 361     dmabuf->texture = 0;
 362 }
 363
 364 void egl_dmabuf_create_sync(QemuDmaBuf *dmabuf)
 365 {
 366     EGLSyncKHR sync;
 367
 368     if (epoxy_has_egl_extension(qemu_egl_display,
 369                                 "EGL_KHR_fence_sync") &&
 370         epoxy_has_egl_extension(qemu_egl_display,
 371                                 "EGL_ANDROID_native_fence_sync")) {
 372         sync = eglCreateSyncKHR(qemu_egl_display,
 373                                 EGL_SYNC_NATIVE_FENCE_ANDROID, NULL);
 374         if (sync != EGL_NO_SYNC_KHR) {
 375             dmabuf->sync = sync;
 376         }
 377     }
 378 }
 379
 380 void egl_dmabuf_create_fence(QemuDmaBuf *dmabuf)
 381 {
 382     if (dmabuf->sync) {
 383         dmabuf->fence_fd = eglDupNativeFenceFDANDROID(qemu_egl_display,
 384                                                       dmabuf->sync);
 385         eglDestroySyncKHR(qemu_egl_display, dmabuf->sync);
 386         dmabuf->sync = NULL;
 387     }
 388 }
 389
 390 #endif /* CONFIG_GBM */
 391
 392 /* ---------------------------------------------------------------------- */
 393
 394 EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, EGLNativeWindowType win)
 395 {
 396     EGLSurface esurface;
 397     EGLBoolean b;
 398
 399     esurface = eglCreateWindowSurface(qemu_egl_display,
 400                                       qemu_egl_config,
 401                                       win, NULL);
 402     if (esurface == EGL_NO_SURFACE) {
 403         error_report("egl: eglCreateWindowSurface failed");
 404         return NULL;
 405     }
 406
 407     b = eglMakeCurrent(qemu_egl_display, esurface, esurface, ectx);
 408     if (b == EGL_FALSE) {
 409         error_report("egl: eglMakeCurrent failed");
 410         return NULL;
 411     }
 412
 413     return esurface;
 414 }
 415
 416 /* ---------------------------------------------------------------------- */
 417
 418 #if defined(CONFIG_X11) || defined(CONFIG_GBM) || defined(WIN32)
 419
 420 /*
 421  * Taken from glamor_egl.h from the Xorg xserver, which is MIT licensed
 422  *
 423  * Create an EGLDisplay from a native display type. This is a little quirky
 424  * for a few reasons.
 425  *
 426  * 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to
 427  * use, but have different function signatures in the third argument; this
 428  * happens not to matter for us, at the moment, but it means epoxy won't alias
 429  * them together.
 430  *
 431  * 2: epoxy 1.3 and earlier don't understand EGL client extensions, which
 432  * means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver
 433  * will crash.
 434  *
 435  * 3: You can't tell whether you have EGL 1.5 at this point, because
 436  * eglQueryString(EGL_VERSION) is a property of the display, which we don't
 437  * have yet. So you have to query for extensions no matter what. Fortunately
 438  * epoxy_has_egl_extension _does_ let you query for client extensions, so
 439  * we don't have to write our own extension string parsing.
 440  *
 441  * 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one
 442  * needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay
 443  * function pointer.
 444  * We can workaround this (circular dependency) by probing for the EGL 1.5
 445  * platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem
 446  * like mesa will be able to advertise these (even though it can do EGL 1.5).
 447  */
 448 static EGLDisplay qemu_egl_get_display(EGLNativeDisplayType native,
 449                                        EGLenum platform)
 450 {
 451     EGLDisplay dpy = EGL_NO_DISPLAY;
 452
 453     /* In practise any EGL 1.5 implementation would support the EXT extension */
 454     if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
 455         if (platform != 0) {
 456             dpy = eglGetPlatformDisplayEXT(platform, native, NULL);
 457         }
 458     }
 459
 460     if (dpy == EGL_NO_DISPLAY) {
 461         /* fallback */
 462         dpy = eglGetDisplay(native);
 463     }
 464     return dpy;
 465 }
 466
 467 static int qemu_egl_init_dpy(EGLNativeDisplayType dpy,
 468                              EGLenum platform,
 469                              DisplayGLMode mode)
 470 {
 471     static const EGLint conf_att_core[] = {
 472         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 473         EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
 474         EGL_RED_SIZE,   5,
 475         EGL_GREEN_SIZE, 5,
 476         EGL_BLUE_SIZE,  5,
 477         EGL_ALPHA_SIZE, 0,
 478         EGL_NONE,
 479     };
 480     static const EGLint conf_att_gles[] = {
 481         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 482         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
 483         EGL_RED_SIZE,   5,
 484         EGL_GREEN_SIZE, 5,
 485         EGL_BLUE_SIZE,  5,
 486         EGL_ALPHA_SIZE, 0,
 487         EGL_NONE,
 488     };
 489     EGLint major, minor;
 490     EGLBoolean b;
 491     EGLint n;
 492     bool gles = (mode == DISPLAYGL_MODE_ES);
 493
 494     qemu_egl_display = qemu_egl_get_display(dpy, platform);
 495     if (qemu_egl_display == EGL_NO_DISPLAY) {
 496         error_report("egl: eglGetDisplay failed: %s", qemu_egl_get_error_string());
 497         return -1;
 498     }
 499
 500     b = eglInitialize(qemu_egl_display, &major, &minor);
 501     if (b == EGL_FALSE) {
 502         error_report("egl: eglInitialize failed: %s", qemu_egl_get_error_string());
 503         return -1;
 504     }
 505
 506     b = eglBindAPI(gles ?  EGL_OPENGL_ES_API : EGL_OPENGL_API);
 507     if (b == EGL_FALSE) {
 508         error_report("egl: eglBindAPI failed (%s mode): %s",
 509                      gles ? "gles" : "core", qemu_egl_get_error_string());
 510         return -1;
 511     }
 512
 513     b = eglChooseConfig(qemu_egl_display,
 514                         gles ? conf_att_gles : conf_att_core,
 515                         &qemu_egl_config, 1, &n);
 516     if (b == EGL_FALSE || n != 1) {
 517         error_report("egl: eglChooseConfig failed (%s mode): %s",
 518                      gles ? "gles" : "core", qemu_egl_get_error_string());
 519         return -1;
 520     }
 521
 522     qemu_egl_mode = gles ? DISPLAYGL_MODE_ES : DISPLAYGL_MODE_CORE;
 523     return 0;
 524 }
 525
 526 #endif
 527
 528 #if defined(CONFIG_X11) || defined(CONFIG_GBM)
 529 int qemu_egl_init_dpy_x11(EGLNativeDisplayType dpy, DisplayGLMode mode)
 530 {
 531 #ifdef EGL_KHR_platform_x11
 532     return qemu_egl_init_dpy(dpy, EGL_PLATFORM_X11_KHR, mode);
 533 #else
 534     return qemu_egl_init_dpy(dpy, 0, mode);
 535 #endif
 536 }
 537
 538 int qemu_egl_init_dpy_mesa(EGLNativeDisplayType dpy, DisplayGLMode mode)
 539 {
 540 #ifdef EGL_MESA_platform_gbm
 541     return qemu_egl_init_dpy(dpy, EGL_PLATFORM_GBM_MESA, mode);
 542 #else
 543     return qemu_egl_init_dpy(dpy, 0, mode);
 544 #endif
 545 }
 546 #endif
 547
 548
 549 #ifdef WIN32
 550 int qemu_egl_init_dpy_win32(EGLNativeDisplayType dpy, DisplayGLMode mode)
 551 {
 552     /* prefer GL ES, as that's what ANGLE supports */
 553     if (mode == DISPLAYGL_MODE_ON) {
 554         mode = DISPLAYGL_MODE_ES;
 555     }
 556     return qemu_egl_init_dpy(dpy, 0, mode);
 557 }
 558 #endif
 559
 560 bool qemu_egl_has_dmabuf(void)
 561 {
 562     if (qemu_egl_display == EGL_NO_DISPLAY) {
 563         return false;
 564     }
 565
 566     return epoxy_has_egl_extension(qemu_egl_display,
 567                                    "EGL_EXT_image_dma_buf_import");
 568 }
 569
 570 EGLContext qemu_egl_init_ctx(void)
 571 {
 572     static const EGLint ctx_att_core[] = {
 573         EGL_CONTEXT_OPENGL_PROFILE_MASK, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT,
 574         EGL_NONE
 575     };
 576     static const EGLint ctx_att_gles[] = {
 577         EGL_CONTEXT_CLIENT_VERSION, 2,
 578         EGL_NONE
 579     };
 580     bool gles = (qemu_egl_mode == DISPLAYGL_MODE_ES);
 581     EGLContext ectx;
 582     EGLBoolean b;
 583
 584     ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
 585                             gles ? ctx_att_gles : ctx_att_core);
 586     if (ectx == EGL_NO_CONTEXT) {
 587         error_report("egl: eglCreateContext failed");
 588         return NULL;
 589     }
 590
 591     b = eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, ectx);
 592     if (b == EGL_FALSE) {
 593         error_report("egl: eglMakeCurrent failed");
 594         return NULL;
 595     }
 596
 597     return ectx;
 598 }
 599
 600 bool egl_init(const char *rendernode, DisplayGLMode mode, Error **errp)
 601 {
 602     ERRP_GUARD();
 603
 604     if (mode == DISPLAYGL_MODE_OFF) {
 605         error_setg(errp, "egl: turning off GL doesn't make sense");
 606         return false;
 607     }
 608
 609 #ifdef WIN32
 610     if (qemu_egl_init_dpy_win32(EGL_DEFAULT_DISPLAY, mode) < 0) {
 611         error_setg(errp, "egl: init failed");
 612         return false;
 613     }
 614     qemu_egl_rn_ctx = qemu_egl_init_ctx();
 615     if (!qemu_egl_rn_ctx) {
 616         error_setg(errp, "egl: egl_init_ctx failed");
 617         return false;
 618     }
 619 #elif defined(CONFIG_GBM)
 620     if (egl_rendernode_init(rendernode, mode) < 0) {
 621         error_setg(errp, "egl: render node init failed");
 622         return false;
 623     }
 624 #endif
 625
 626     if (!qemu_egl_rn_ctx) {
 627         error_setg(errp, "egl: not available on this platform");
 628         return false;
 629     }
 630
 631     display_opengl = 1;
 632     return true;
 633 }