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 {
 205     EGLImageKHR image;
 206     EGLint num_planes, fd;
 207
 208     image = eglCreateImageKHR(qemu_egl_display, eglGetCurrentContext(),
 209                               EGL_GL_TEXTURE_2D_KHR,
 210                               (EGLClientBuffer)(unsigned long)tex_id,
 211                               NULL);
 212     if (!image) {
 213         return -1;
 214     }
 215
 216     eglExportDMABUFImageQueryMESA(qemu_egl_display, image, fourcc,
 217                                   &num_planes, NULL);
 218     if (num_planes != 1) {
 219         eglDestroyImageKHR(qemu_egl_display, image);
 220         return -1;
 221     }
 222     eglExportDMABUFImageMESA(qemu_egl_display, image, &fd, stride, NULL);
 223     eglDestroyImageKHR(qemu_egl_display, image);
 224
 225     return fd;
 226 }
 227
 228 void egl_dmabuf_import_texture(QemuDmaBuf *dmabuf)
 229 {
 230     EGLImageKHR image = EGL_NO_IMAGE_KHR;
 231     EGLint attrs[] = {
 232         EGL_DMA_BUF_PLANE0_FD_EXT,      dmabuf->fd,
 233         EGL_DMA_BUF_PLANE0_PITCH_EXT,   dmabuf->stride,
 234         EGL_DMA_BUF_PLANE0_OFFSET_EXT,  0,
 235         EGL_WIDTH,                      dmabuf->width,
 236         EGL_HEIGHT,                     dmabuf->height,
 237         EGL_LINUX_DRM_FOURCC_EXT,       dmabuf->fourcc,
 238         EGL_NONE, /* end of list */
 239     };
 240
 241     if (dmabuf->texture != 0) {
 242         return;
 243     }
 244
 245     image = eglCreateImageKHR(qemu_egl_display,
 246                               EGL_NO_CONTEXT,
 247                               EGL_LINUX_DMA_BUF_EXT,
 248                               NULL, attrs);
 249     if (image == EGL_NO_IMAGE_KHR) {
 250         error_report("eglCreateImageKHR failed");
 251         return;
 252     }
 253
 254     glGenTextures(1, &dmabuf->texture);
 255     glBindTexture(GL_TEXTURE_2D, dmabuf->texture);
 256     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 257     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 258
 259     glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
 260     eglDestroyImageKHR(qemu_egl_display, image);
 261 }
 262
 263 void egl_dmabuf_release_texture(QemuDmaBuf *dmabuf)
 264 {
 265     if (dmabuf->texture == 0) {
 266         return;
 267     }
 268
 269     glDeleteTextures(1, &dmabuf->texture);
 270     dmabuf->texture = 0;
 271 }
 272
 273 #endif /* CONFIG_OPENGL_DMABUF */
 274
 275 /* ---------------------------------------------------------------------- */
 276
 277 EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, EGLNativeWindowType win)
 278 {
 279     EGLSurface esurface;
 280     EGLBoolean b;
 281
 282     esurface = eglCreateWindowSurface(qemu_egl_display,
 283                                       qemu_egl_config,
 284                                       win, NULL);
 285     if (esurface == EGL_NO_SURFACE) {
 286         error_report("egl: eglCreateWindowSurface failed");
 287         return NULL;
 288     }
 289
 290     b = eglMakeCurrent(qemu_egl_display, esurface, esurface, ectx);
 291     if (b == EGL_FALSE) {
 292         error_report("egl: eglMakeCurrent failed");
 293         return NULL;
 294     }
 295
 296     return esurface;
 297 }
 298
 299 /* ---------------------------------------------------------------------- */
 300
 301 /*
 302  * Taken from glamor_egl.h from the Xorg xserver, which is MIT licensed
 303  *
 304  * Create an EGLDisplay from a native display type. This is a little quirky
 305  * for a few reasons.
 306  *
 307  * 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to
 308  * use, but have different function signatures in the third argument; this
 309  * happens not to matter for us, at the moment, but it means epoxy won't alias
 310  * them together.
 311  *
 312  * 2: epoxy 1.3 and earlier don't understand EGL client extensions, which
 313  * means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver
 314  * will crash.
 315  *
 316  * 3: You can't tell whether you have EGL 1.5 at this point, because
 317  * eglQueryString(EGL_VERSION) is a property of the display, which we don't
 318  * have yet. So you have to query for extensions no matter what. Fortunately
 319  * epoxy_has_egl_extension _does_ let you query for client extensions, so
 320  * we don't have to write our own extension string parsing.
 321  *
 322  * 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one
 323  * needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay
 324  * function pointer.
 325  * We can workaround this (circular dependency) by probing for the EGL 1.5
 326  * platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem
 327  * like mesa will be able to advertise these (even though it can do EGL 1.5).
 328  */
 329 static EGLDisplay qemu_egl_get_display(EGLNativeDisplayType native,
 330                                        EGLenum platform)
 331 {
 332     EGLDisplay dpy = EGL_NO_DISPLAY;
 333
 334     /* In practise any EGL 1.5 implementation would support the EXT extension */
 335     if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
 336         PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT =
 337             (void *) eglGetProcAddress("eglGetPlatformDisplayEXT");
 338         if (getPlatformDisplayEXT && platform != 0) {
 339             dpy = getPlatformDisplayEXT(platform, native, NULL);
 340         }
 341     }
 342
 343     if (dpy == EGL_NO_DISPLAY) {
 344         /* fallback */
 345         dpy = eglGetDisplay(native);
 346     }
 347     return dpy;
 348 }
 349
 350 static int qemu_egl_init_dpy(EGLNativeDisplayType dpy,
 351                              EGLenum platform,
 352                              DisplayGLMode mode)
 353 {
 354     static const EGLint conf_att_core[] = {
 355         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 356         EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
 357         EGL_RED_SIZE,   5,
 358         EGL_GREEN_SIZE, 5,
 359         EGL_BLUE_SIZE,  5,
 360         EGL_ALPHA_SIZE, 0,
 361         EGL_NONE,
 362     };
 363     static const EGLint conf_att_gles[] = {
 364         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 365         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
 366         EGL_RED_SIZE,   5,
 367         EGL_GREEN_SIZE, 5,
 368         EGL_BLUE_SIZE,  5,
 369         EGL_ALPHA_SIZE, 0,
 370         EGL_NONE,
 371     };
 372     EGLint major, minor;
 373     EGLBoolean b;
 374     EGLint n;
 375     bool gles = (mode == DISPLAYGL_MODE_ES);
 376
 377     qemu_egl_display = qemu_egl_get_display(dpy, platform);
 378     if (qemu_egl_display == EGL_NO_DISPLAY) {
 379         error_report("egl: eglGetDisplay failed");
 380         return -1;
 381     }
 382
 383     b = eglInitialize(qemu_egl_display, &major, &minor);
 384     if (b == EGL_FALSE) {
 385         error_report("egl: eglInitialize failed");
 386         return -1;
 387     }
 388
 389     b = eglBindAPI(gles ?  EGL_OPENGL_ES_API : EGL_OPENGL_API);
 390     if (b == EGL_FALSE) {
 391         error_report("egl: eglBindAPI failed (%s mode)",
 392                      gles ? "gles" : "core");
 393         return -1;
 394     }
 395
 396     b = eglChooseConfig(qemu_egl_display,
 397                         gles ? conf_att_gles : conf_att_core,
 398                         &qemu_egl_config, 1, &n);
 399     if (b == EGL_FALSE || n != 1) {
 400         error_report("egl: eglChooseConfig failed (%s mode)",
 401                      gles ? "gles" : "core");
 402         return -1;
 403     }
 404
 405     qemu_egl_mode = gles ? DISPLAYGL_MODE_ES : DISPLAYGL_MODE_CORE;
 406     return 0;
 407 }
 408
 409 int qemu_egl_init_dpy_x11(EGLNativeDisplayType dpy, DisplayGLMode mode)
 410 {
 411 #ifdef EGL_KHR_platform_x11
 412     return qemu_egl_init_dpy(dpy, EGL_PLATFORM_X11_KHR, mode);
 413 #else
 414     return qemu_egl_init_dpy(dpy, 0, mode);
 415 #endif
 416 }
 417
 418 int qemu_egl_init_dpy_mesa(EGLNativeDisplayType dpy, DisplayGLMode mode)
 419 {
 420 #ifdef EGL_MESA_platform_gbm
 421     return qemu_egl_init_dpy(dpy, EGL_PLATFORM_GBM_MESA, mode);
 422 #else
 423     return qemu_egl_init_dpy(dpy, 0, mode);
 424 #endif
 425 }
 426
 427 EGLContext qemu_egl_init_ctx(void)
 428 {
 429     static const EGLint ctx_att_core[] = {
 430         EGL_CONTEXT_OPENGL_PROFILE_MASK, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT,
 431         EGL_NONE
 432     };
 433     static const EGLint ctx_att_gles[] = {
 434         EGL_CONTEXT_CLIENT_VERSION, 2,
 435         EGL_NONE
 436     };
 437     bool gles = (qemu_egl_mode == DISPLAYGL_MODE_ES);
 438     EGLContext ectx;
 439     EGLBoolean b;
 440
 441     ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
 442                             gles ? ctx_att_gles : ctx_att_core);
 443     if (ectx == EGL_NO_CONTEXT) {
 444         error_report("egl: eglCreateContext failed");
 445         return NULL;
 446     }
 447
 448     b = eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, ectx);
 449     if (b == EGL_FALSE) {
 450         error_report("egl: eglMakeCurrent failed");
 451         return NULL;
 452     }
 453
 454     return ectx;
 455 }