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