qemu/ui/egl-helpers.c
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   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
  23EGLDisplay *qemu_egl_display;
  24EGLConfig qemu_egl_config;
  25DisplayGLMode qemu_egl_mode;
  26
  27/* ------------------------------------------------------------------ */
  28
  29static 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
  39void 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
  54void 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
  61void 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
  79void 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
  91void 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
 105void egl_fb_read(DisplaySurface *dst, egl_fb *src)
 106{
 107    glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer);
 108    glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
 109    glReadPixels(0, 0, surface_width(dst), surface_height(dst),
 110                 GL_BGRA, GL_UNSIGNED_BYTE, surface_data(dst));
 111}
 112
 113void 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
 122void 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_GBM
 144
 145int qemu_egl_rn_fd;
 146struct gbm_device *qemu_egl_rn_gbm_dev;
 147EGLContext qemu_egl_rn_ctx;
 148
 149int 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
 192err:
 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
 203int 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
 229void 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
 280void 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_GBM */
 291
 292/* ---------------------------------------------------------------------- */
 293
 294EGLSurface 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#if defined(CONFIG_X11) || defined(CONFIG_GBM)
 319
 320/*
 321 * Taken from glamor_egl.h from the Xorg xserver, which is MIT licensed
 322 *
 323 * Create an EGLDisplay from a native display type. This is a little quirky
 324 * for a few reasons.
 325 *
 326 * 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to
 327 * use, but have different function signatures in the third argument; this
 328 * happens not to matter for us, at the moment, but it means epoxy won't alias
 329 * them together.
 330 *
 331 * 2: epoxy 1.3 and earlier don't understand EGL client extensions, which
 332 * means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver
 333 * will crash.
 334 *
 335 * 3: You can't tell whether you have EGL 1.5 at this point, because
 336 * eglQueryString(EGL_VERSION) is a property of the display, which we don't
 337 * have yet. So you have to query for extensions no matter what. Fortunately
 338 * epoxy_has_egl_extension _does_ let you query for client extensions, so
 339 * we don't have to write our own extension string parsing.
 340 *
 341 * 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one
 342 * needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay
 343 * function pointer.
 344 * We can workaround this (circular dependency) by probing for the EGL 1.5
 345 * platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem
 346 * like mesa will be able to advertise these (even though it can do EGL 1.5).
 347 */
 348static EGLDisplay qemu_egl_get_display(EGLNativeDisplayType native,
 349                                       EGLenum platform)
 350{
 351    EGLDisplay dpy = EGL_NO_DISPLAY;
 352
 353    /* In practise any EGL 1.5 implementation would support the EXT extension */
 354    if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
 355        PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT =
 356            (void *) eglGetProcAddress("eglGetPlatformDisplayEXT");
 357        if (getPlatformDisplayEXT && platform != 0) {
 358            dpy = getPlatformDisplayEXT(platform, native, NULL);
 359        }
 360    }
 361
 362    if (dpy == EGL_NO_DISPLAY) {
 363        /* fallback */
 364        dpy = eglGetDisplay(native);
 365    }
 366    return dpy;
 367}
 368
 369static int qemu_egl_init_dpy(EGLNativeDisplayType dpy,
 370                             EGLenum platform,
 371                             DisplayGLMode mode)
 372{
 373    static const EGLint conf_att_core[] = {
 374        EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 375        EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
 376        EGL_RED_SIZE,   5,
 377        EGL_GREEN_SIZE, 5,
 378        EGL_BLUE_SIZE,  5,
 379        EGL_ALPHA_SIZE, 0,
 380        EGL_NONE,
 381    };
 382    static const EGLint conf_att_gles[] = {
 383        EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 384        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
 385        EGL_RED_SIZE,   5,
 386        EGL_GREEN_SIZE, 5,
 387        EGL_BLUE_SIZE,  5,
 388        EGL_ALPHA_SIZE, 0,
 389        EGL_NONE,
 390    };
 391    EGLint major, minor;
 392    EGLBoolean b;
 393    EGLint n;
 394    bool gles = (mode == DISPLAYGL_MODE_ES);
 395
 396    qemu_egl_display = qemu_egl_get_display(dpy, platform);
 397    if (qemu_egl_display == EGL_NO_DISPLAY) {
 398        error_report("egl: eglGetDisplay failed");
 399        return -1;
 400    }
 401
 402    b = eglInitialize(qemu_egl_display, &major, &minor);
 403    if (b == EGL_FALSE) {
 404        error_report("egl: eglInitialize failed");
 405        return -1;
 406    }
 407
 408    b = eglBindAPI(gles ?  EGL_OPENGL_ES_API : EGL_OPENGL_API);
 409    if (b == EGL_FALSE) {
 410        error_report("egl: eglBindAPI failed (%s mode)",
 411                     gles ? "gles" : "core");
 412        return -1;
 413    }
 414
 415    b = eglChooseConfig(qemu_egl_display,
 416                        gles ? conf_att_gles : conf_att_core,
 417                        &qemu_egl_config, 1, &n);
 418    if (b == EGL_FALSE || n != 1) {
 419        error_report("egl: eglChooseConfig failed (%s mode)",
 420                     gles ? "gles" : "core");
 421        return -1;
 422    }
 423
 424    qemu_egl_mode = gles ? DISPLAYGL_MODE_ES : DISPLAYGL_MODE_CORE;
 425    return 0;
 426}
 427
 428int qemu_egl_init_dpy_x11(EGLNativeDisplayType dpy, DisplayGLMode mode)
 429{
 430#ifdef EGL_KHR_platform_x11
 431    return qemu_egl_init_dpy(dpy, EGL_PLATFORM_X11_KHR, mode);
 432#else
 433    return qemu_egl_init_dpy(dpy, 0, mode);
 434#endif
 435}
 436
 437int qemu_egl_init_dpy_mesa(EGLNativeDisplayType dpy, DisplayGLMode mode)
 438{
 439#ifdef EGL_MESA_platform_gbm
 440    return qemu_egl_init_dpy(dpy, EGL_PLATFORM_GBM_MESA, mode);
 441#else
 442    return qemu_egl_init_dpy(dpy, 0, mode);
 443#endif
 444}
 445
 446#endif
 447
 448bool qemu_egl_has_dmabuf(void)
 449{
 450    if (qemu_egl_display == EGL_NO_DISPLAY) {
 451        return false;
 452    }
 453
 454    return epoxy_has_egl_extension(qemu_egl_display,
 455                                   "EGL_EXT_image_dma_buf_import");
 456}
 457
 458EGLContext qemu_egl_init_ctx(void)
 459{
 460    static const EGLint ctx_att_core[] = {
 461        EGL_CONTEXT_OPENGL_PROFILE_MASK, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT,
 462        EGL_NONE
 463    };
 464    static const EGLint ctx_att_gles[] = {
 465        EGL_CONTEXT_CLIENT_VERSION, 2,
 466        EGL_NONE
 467    };
 468    bool gles = (qemu_egl_mode == DISPLAYGL_MODE_ES);
 469    EGLContext ectx;
 470    EGLBoolean b;
 471
 472    ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
 473                            gles ? ctx_att_gles : ctx_att_core);
 474    if (ectx == EGL_NO_CONTEXT) {
 475        error_report("egl: eglCreateContext failed");
 476        return NULL;
 477    }
 478
 479    b = eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, ectx);
 480    if (b == EGL_FALSE) {
 481        error_report("egl: eglMakeCurrent failed");
 482        return NULL;
 483    }
 484
 485    return ectx;
 486}
 487