ui/egl-helpers.c

   1 #include "qemu/osdep.h"
   2 #include <glob.h>
   3 #include <dirent.h>
   4
   5 #include "config-host.h"
   6 #include "ui/egl-helpers.h"
   7
   8 EGLDisplay *qemu_egl_display;
   9 EGLConfig qemu_egl_config;
  10
  11 /* ---------------------------------------------------------------------- */
  12
  13 static bool egl_gles;
  14 static int egl_debug;
  15
  16 #define egl_dbg(_x ...)                          \
  17     do {                                         \
  18         if (egl_debug) {                         \
  19             fprintf(stderr, "egl: " _x);         \
  20         }                                        \
  21     } while (0);
  22
  23 /* ---------------------------------------------------------------------- */
  24
  25 #ifdef CONFIG_OPENGL_DMABUF
  26
  27 int qemu_egl_rn_fd;
  28 struct gbm_device *qemu_egl_rn_gbm_dev;
  29 EGLContext qemu_egl_rn_ctx;
  30
  31 int qemu_egl_rendernode_open(void)
  32 {
  33     DIR *dir;
  34     struct dirent *e;
  35     int r, fd;
  36     char *p;
  37
  38     dir = opendir("/dev/dri");
  39     if (!dir) {
  40         return -1;
  41     }
  42
  43     fd = -1;
  44     while ((e = readdir(dir))) {
  45         if (e->d_type != DT_CHR) {
  46             continue;
  47         }
  48
  49         if (strncmp(e->d_name, "renderD", 7)) {
  50             continue;
  51         }
  52
  53         r = asprintf(&p, "/dev/dri/%s", e->d_name);
  54         if (r < 0) {
  55             return -1;
  56         }
  57
  58         r = open(p, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
  59         if (r < 0) {
  60             free(p);
  61             continue;
  62         }
  63         fd = r;
  64         free(p);
  65         break;
  66     }
  67
  68     closedir(dir);
  69     if (fd < 0) {
  70         return -1;
  71     }
  72     return fd;
  73 }
  74
  75 int egl_rendernode_init(void)
  76 {
  77     qemu_egl_rn_fd = -1;
  78
  79     qemu_egl_rn_fd = qemu_egl_rendernode_open();
  80     if (qemu_egl_rn_fd == -1) {
  81         fprintf(stderr, "egl: no drm render node available\n");
  82         goto err;
  83     }
  84
  85     qemu_egl_rn_gbm_dev = gbm_create_device(qemu_egl_rn_fd);
  86     if (!qemu_egl_rn_gbm_dev) {
  87         fprintf(stderr, "egl: gbm_create_device failed\n");
  88         goto err;
  89     }
  90
  91     qemu_egl_init_dpy((EGLNativeDisplayType)qemu_egl_rn_gbm_dev, false, false);
  92
  93     if (!epoxy_has_egl_extension(qemu_egl_display,
  94                                  "EGL_KHR_surfaceless_context")) {
  95         fprintf(stderr, "egl: EGL_KHR_surfaceless_context not supported\n");
  96         goto err;
  97     }
  98     if (!epoxy_has_egl_extension(qemu_egl_display,
  99                                  "EGL_MESA_image_dma_buf_export")) {
 100         fprintf(stderr, "egl: EGL_MESA_image_dma_buf_export not supported\n");
 101         goto err;
 102     }
 103
 104     qemu_egl_rn_ctx = qemu_egl_init_ctx();
 105     if (!qemu_egl_rn_ctx) {
 106         fprintf(stderr, "egl: egl_init_ctx failed\n");
 107         goto err;
 108     }
 109
 110     return 0;
 111
 112 err:
 113     if (qemu_egl_rn_gbm_dev) {
 114         gbm_device_destroy(qemu_egl_rn_gbm_dev);
 115     }
 116     if (qemu_egl_rn_fd != -1) {
 117         close(qemu_egl_rn_fd);
 118     }
 119
 120     return -1;
 121 }
 122
 123 int egl_get_fd_for_texture(uint32_t tex_id, EGLint *stride, EGLint *fourcc)
 124 {
 125     EGLImageKHR image;
 126     EGLint num_planes, fd;
 127
 128     image = eglCreateImageKHR(qemu_egl_display, eglGetCurrentContext(),
 129                               EGL_GL_TEXTURE_2D_KHR,
 130                               (EGLClientBuffer)(unsigned long)tex_id,
 131                               NULL);
 132     if (!image) {
 133         return -1;
 134     }
 135
 136     eglExportDMABUFImageQueryMESA(qemu_egl_display, image, fourcc,
 137                                   &num_planes, NULL);
 138     if (num_planes != 1) {
 139         eglDestroyImageKHR(qemu_egl_display, image);
 140         return -1;
 141     }
 142     eglExportDMABUFImageMESA(qemu_egl_display, image, &fd, stride, NULL);
 143     eglDestroyImageKHR(qemu_egl_display, image);
 144
 145     return fd;
 146 }
 147
 148 #endif /* CONFIG_OPENGL_DMABUF */
 149
 150 /* ---------------------------------------------------------------------- */
 151
 152 EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, Window win)
 153 {
 154     EGLSurface esurface;
 155     EGLBoolean b;
 156
 157     egl_dbg("eglCreateWindowSurface (x11 win id 0x%lx) ...\n",
 158             (unsigned long) win);
 159     esurface = eglCreateWindowSurface(qemu_egl_display,
 160                                       qemu_egl_config,
 161                                       (EGLNativeWindowType)win, NULL);
 162     if (esurface == EGL_NO_SURFACE) {
 163         fprintf(stderr, "egl: eglCreateWindowSurface failed\n");
 164         return NULL;
 165     }
 166
 167     b = eglMakeCurrent(qemu_egl_display, esurface, esurface, ectx);
 168     if (b == EGL_FALSE) {
 169         fprintf(stderr, "egl: eglMakeCurrent failed\n");
 170         return NULL;
 171     }
 172
 173     return esurface;
 174 }
 175
 176 /* ---------------------------------------------------------------------- */
 177
 178 int qemu_egl_init_dpy(EGLNativeDisplayType dpy, bool gles, bool debug)
 179 {
 180     static const EGLint conf_att_gl[] = {
 181         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 182         EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
 183         EGL_RED_SIZE,   5,
 184         EGL_GREEN_SIZE, 5,
 185         EGL_BLUE_SIZE,  5,
 186         EGL_ALPHA_SIZE, 0,
 187         EGL_NONE,
 188     };
 189     static const EGLint conf_att_gles[] = {
 190         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 191         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
 192         EGL_RED_SIZE,   5,
 193         EGL_GREEN_SIZE, 5,
 194         EGL_BLUE_SIZE,  5,
 195         EGL_ALPHA_SIZE, 0,
 196         EGL_NONE,
 197     };
 198     EGLint major, minor;
 199     EGLBoolean b;
 200     EGLint n;
 201
 202     if (debug) {
 203         egl_debug = 1;
 204         setenv("EGL_LOG_LEVEL", "debug", true);
 205         setenv("LIBGL_DEBUG", "verbose", true);
 206     }
 207
 208     egl_dbg("eglGetDisplay (dpy %p) ...\n", dpy);
 209     qemu_egl_display = eglGetDisplay(dpy);
 210     if (qemu_egl_display == EGL_NO_DISPLAY) {
 211         fprintf(stderr, "egl: eglGetDisplay failed\n");
 212         return -1;
 213     }
 214
 215     egl_dbg("eglInitialize ...\n");
 216     b = eglInitialize(qemu_egl_display, &major, &minor);
 217     if (b == EGL_FALSE) {
 218         fprintf(stderr, "egl: eglInitialize failed\n");
 219         return -1;
 220     }
 221
 222     egl_dbg("eglBindAPI ...\n");
 223     b = eglBindAPI(gles ? EGL_OPENGL_ES_API : EGL_OPENGL_API);
 224     if (b == EGL_FALSE) {
 225         fprintf(stderr, "egl: eglBindAPI failed\n");
 226         return -1;
 227     }
 228
 229     egl_dbg("eglChooseConfig ...\n");
 230     b = eglChooseConfig(qemu_egl_display,
 231                         gles ? conf_att_gles : conf_att_gl,
 232                         &qemu_egl_config, 1, &n);
 233     if (b == EGL_FALSE || n != 1) {
 234         fprintf(stderr, "egl: eglChooseConfig failed\n");
 235         return -1;
 236     }
 237
 238     egl_gles = gles;
 239     return 0;
 240 }
 241
 242 EGLContext qemu_egl_init_ctx(void)
 243 {
 244     static const EGLint ctx_att_gl[] = {
 245         EGL_NONE
 246     };
 247     static const EGLint ctx_att_gles[] = {
 248         EGL_CONTEXT_CLIENT_VERSION, 2,
 249         EGL_NONE
 250     };
 251
 252     EGLContext ectx;
 253     EGLBoolean b;
 254
 255     egl_dbg("eglCreateContext ...\n");
 256     ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
 257                             egl_gles ? ctx_att_gles : ctx_att_gl);
 258     if (ectx == EGL_NO_CONTEXT) {
 259         fprintf(stderr, "egl: eglCreateContext failed\n");
 260         return NULL;
 261     }
 262
 263     b = eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, ectx);
 264     if (b == EGL_FALSE) {
 265         fprintf(stderr, "egl: eglMakeCurrent failed\n");
 266         return NULL;
 267     }
 268
 269     return ectx;
 270 }