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