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 <glob.h>
  19 #include <dirent.h>
  20
  21 #include "qemu/error-report.h"
  22 #include "ui/egl-helpers.h"
  23
  24 EGLDisplay *qemu_egl_display;
  25 EGLConfig qemu_egl_config;
  26
  27 /* ---------------------------------------------------------------------- */
  28
  29 static bool egl_gles;
  30 static int egl_debug;
  31
  32 #define egl_dbg(_x ...)                          \
  33     do {                                         \
  34         if (egl_debug) {                         \
  35             fprintf(stderr, "egl: " _x);         \
  36         }                                        \
  37     } while (0);
  38
  39 /* ---------------------------------------------------------------------- */
  40
  41 #ifdef CONFIG_OPENGL_DMABUF
  42
  43 int qemu_egl_rn_fd;
  44 struct gbm_device *qemu_egl_rn_gbm_dev;
  45 EGLContext qemu_egl_rn_ctx;
  46
  47 static int qemu_egl_rendernode_open(const char *rendernode)
  48 {
  49     DIR *dir;
  50     struct dirent *e;
  51     int r, fd;
  52     char *p;
  53
  54     if (rendernode) {
  55         return open(rendernode, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
  56     }
  57
  58     dir = opendir("/dev/dri");
  59     if (!dir) {
  60         return -1;
  61     }
  62
  63     fd = -1;
  64     while ((e = readdir(dir))) {
  65         if (e->d_type != DT_CHR) {
  66             continue;
  67         }
  68
  69         if (strncmp(e->d_name, "renderD", 7)) {
  70             continue;
  71         }
  72
  73         p = g_strdup_printf("/dev/dri/%s", e->d_name);
  74
  75         r = open(p, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
  76         if (r < 0) {
  77             g_free(p);
  78             continue;
  79         }
  80         fd = r;
  81         g_free(p);
  82         break;
  83     }
  84
  85     closedir(dir);
  86     if (fd < 0) {
  87         return -1;
  88     }
  89     return fd;
  90 }
  91
  92 int egl_rendernode_init(const char *rendernode)
  93 {
  94     qemu_egl_rn_fd = -1;
  95
  96     qemu_egl_rn_fd = qemu_egl_rendernode_open(rendernode);
  97     if (qemu_egl_rn_fd == -1) {
  98         error_report("egl: no drm render node available");
  99         goto err;
 100     }
 101
 102     qemu_egl_rn_gbm_dev = gbm_create_device(qemu_egl_rn_fd);
 103     if (!qemu_egl_rn_gbm_dev) {
 104         error_report("egl: gbm_create_device failed");
 105         goto err;
 106     }
 107
 108     qemu_egl_init_dpy((EGLNativeDisplayType)qemu_egl_rn_gbm_dev, false, false);
 109
 110     if (!epoxy_has_egl_extension(qemu_egl_display,
 111                                  "EGL_KHR_surfaceless_context")) {
 112         error_report("egl: EGL_KHR_surfaceless_context not supported");
 113         goto err;
 114     }
 115     if (!epoxy_has_egl_extension(qemu_egl_display,
 116                                  "EGL_MESA_image_dma_buf_export")) {
 117         error_report("egl: EGL_MESA_image_dma_buf_export not supported");
 118         goto err;
 119     }
 120
 121     qemu_egl_rn_ctx = qemu_egl_init_ctx();
 122     if (!qemu_egl_rn_ctx) {
 123         error_report("egl: egl_init_ctx failed");
 124         goto err;
 125     }
 126
 127     return 0;
 128
 129 err:
 130     if (qemu_egl_rn_gbm_dev) {
 131         gbm_device_destroy(qemu_egl_rn_gbm_dev);
 132     }
 133     if (qemu_egl_rn_fd != -1) {
 134         close(qemu_egl_rn_fd);
 135     }
 136
 137     return -1;
 138 }
 139
 140 int egl_get_fd_for_texture(uint32_t tex_id, EGLint *stride, EGLint *fourcc)
 141 {
 142     EGLImageKHR image;
 143     EGLint num_planes, fd;
 144
 145     image = eglCreateImageKHR(qemu_egl_display, eglGetCurrentContext(),
 146                               EGL_GL_TEXTURE_2D_KHR,
 147                               (EGLClientBuffer)(unsigned long)tex_id,
 148                               NULL);
 149     if (!image) {
 150         return -1;
 151     }
 152
 153     eglExportDMABUFImageQueryMESA(qemu_egl_display, image, fourcc,
 154                                   &num_planes, NULL);
 155     if (num_planes != 1) {
 156         eglDestroyImageKHR(qemu_egl_display, image);
 157         return -1;
 158     }
 159     eglExportDMABUFImageMESA(qemu_egl_display, image, &fd, stride, NULL);
 160     eglDestroyImageKHR(qemu_egl_display, image);
 161
 162     return fd;
 163 }
 164
 165 #endif /* CONFIG_OPENGL_DMABUF */
 166
 167 /* ---------------------------------------------------------------------- */
 168
 169 EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, Window win)
 170 {
 171     EGLSurface esurface;
 172     EGLBoolean b;
 173
 174     egl_dbg("eglCreateWindowSurface (x11 win id 0x%lx) ...\n",
 175             (unsigned long) win);
 176     esurface = eglCreateWindowSurface(qemu_egl_display,
 177                                       qemu_egl_config,
 178                                       (EGLNativeWindowType)win, NULL);
 179     if (esurface == EGL_NO_SURFACE) {
 180         error_report("egl: eglCreateWindowSurface failed");
 181         return NULL;
 182     }
 183
 184     b = eglMakeCurrent(qemu_egl_display, esurface, esurface, ectx);
 185     if (b == EGL_FALSE) {
 186         error_report("egl: eglMakeCurrent failed");
 187         return NULL;
 188     }
 189
 190     return esurface;
 191 }
 192
 193 /* ---------------------------------------------------------------------- */
 194
 195 /*
 196  * Taken from glamor_egl.h from the Xorg xserver, which is MIT licensed
 197  *
 198  * Create an EGLDisplay from a native display type. This is a little quirky
 199  * for a few reasons.
 200  *
 201  * 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to
 202  * use, but have different function signatures in the third argument; this
 203  * happens not to matter for us, at the moment, but it means epoxy won't alias
 204  * them together.
 205  *
 206  * 2: epoxy 1.3 and earlier don't understand EGL client extensions, which
 207  * means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver
 208  * will crash.
 209  *
 210  * 3: You can't tell whether you have EGL 1.5 at this point, because
 211  * eglQueryString(EGL_VERSION) is a property of the display, which we don't
 212  * have yet. So you have to query for extensions no matter what. Fortunately
 213  * epoxy_has_egl_extension _does_ let you query for client extensions, so
 214  * we don't have to write our own extension string parsing.
 215  *
 216  * 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one
 217  * needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay
 218  * function pointer.
 219  * We can workaround this (circular dependency) by probing for the EGL 1.5
 220  * platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem
 221  * like mesa will be able to advertise these (even though it can do EGL 1.5).
 222  */
 223 static EGLDisplay qemu_egl_get_display(void *native)
 224 {
 225     EGLDisplay dpy = EGL_NO_DISPLAY;
 226
 227 #ifdef EGL_MESA_platform_gbm
 228     /* In practise any EGL 1.5 implementation would support the EXT extension */
 229     if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
 230         PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT =
 231             (void *) eglGetProcAddress("eglGetPlatformDisplayEXT");
 232         if (getPlatformDisplayEXT) {
 233             dpy = getPlatformDisplayEXT(EGL_PLATFORM_GBM_MESA, native, NULL);
 234         }
 235     }
 236 #endif
 237
 238     if (dpy == EGL_NO_DISPLAY) {
 239         /* fallback */
 240         dpy = eglGetDisplay(native);
 241     }
 242     return dpy;
 243 }
 244
 245 int qemu_egl_init_dpy(EGLNativeDisplayType dpy, bool gles, bool debug)
 246 {
 247     static const EGLint conf_att_gl[] = {
 248         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 249         EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
 250         EGL_RED_SIZE,   5,
 251         EGL_GREEN_SIZE, 5,
 252         EGL_BLUE_SIZE,  5,
 253         EGL_ALPHA_SIZE, 0,
 254         EGL_NONE,
 255     };
 256     static const EGLint conf_att_gles[] = {
 257         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 258         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
 259         EGL_RED_SIZE,   5,
 260         EGL_GREEN_SIZE, 5,
 261         EGL_BLUE_SIZE,  5,
 262         EGL_ALPHA_SIZE, 0,
 263         EGL_NONE,
 264     };
 265     EGLint major, minor;
 266     EGLBoolean b;
 267     EGLint n;
 268
 269     if (debug) {
 270         egl_debug = 1;
 271         setenv("EGL_LOG_LEVEL", "debug", true);
 272         setenv("LIBGL_DEBUG", "verbose", true);
 273     }
 274
 275     egl_dbg("qemu_egl_get_display (dpy %p) ...\n", dpy);
 276     qemu_egl_display = qemu_egl_get_display(dpy);
 277     if (qemu_egl_display == EGL_NO_DISPLAY) {
 278         error_report("egl: eglGetDisplay failed");
 279         return -1;
 280     }
 281
 282     egl_dbg("eglInitialize ...\n");
 283     b = eglInitialize(qemu_egl_display, &major, &minor);
 284     if (b == EGL_FALSE) {
 285         error_report("egl: eglInitialize failed");
 286         return -1;
 287     }
 288
 289     egl_dbg("eglBindAPI ...\n");
 290     b = eglBindAPI(gles ? EGL_OPENGL_ES_API : EGL_OPENGL_API);
 291     if (b == EGL_FALSE) {
 292         error_report("egl: eglBindAPI failed");
 293         return -1;
 294     }
 295
 296     egl_dbg("eglChooseConfig ...\n");
 297     b = eglChooseConfig(qemu_egl_display,
 298                         gles ? conf_att_gles : conf_att_gl,
 299                         &qemu_egl_config, 1, &n);
 300     if (b == EGL_FALSE || n != 1) {
 301         error_report("egl: eglChooseConfig failed");
 302         return -1;
 303     }
 304
 305     egl_gles = gles;
 306     return 0;
 307 }
 308
 309 EGLContext qemu_egl_init_ctx(void)
 310 {
 311     static const EGLint ctx_att_gl[] = {
 312         EGL_NONE
 313     };
 314     static const EGLint ctx_att_gles[] = {
 315         EGL_CONTEXT_CLIENT_VERSION, 2,
 316         EGL_NONE
 317     };
 318
 319     EGLContext ectx;
 320     EGLBoolean b;
 321
 322     egl_dbg("eglCreateContext ...\n");
 323     ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
 324                             egl_gles ? ctx_att_gles : ctx_att_gl);
 325     if (ectx == EGL_NO_CONTEXT) {
 326         error_report("egl: eglCreateContext failed");
 327         return NULL;
 328     }
 329
 330     b = eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, ectx);
 331     if (b == EGL_FALSE) {
 332         error_report("egl: eglMakeCurrent failed");
 333         return NULL;
 334     }
 335
 336     return ectx;
 337 }