src/egl/drivers/dri2/platform_surfaceless.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (c) 2014 The Chromium OS Authors.
   5  * Copyright © 2011 Intel Corporation
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23  * DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <xf86drm.h>
  30 #include <dlfcn.h>
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <fcntl.h>
  34 #include <unistd.h>
  35
  36 #include "egl_dri2.h"
  37 #include "egl_dri2_fallbacks.h"
  38 #include "loader.h"
  39
  40 static __DRIimage*
  41 surfaceless_alloc_image(struct dri2_egl_display *dri2_dpy,
  42                      struct dri2_egl_surface *dri2_surf)
  43 {
  44    return dri2_dpy->image->createImage(
  45             dri2_dpy->dri_screen,
  46             dri2_surf->base.Width,
  47             dri2_surf->base.Height,
  48             dri2_surf->visual,
  49             0,
  50             NULL);
  51 }
  52
  53 static void
  54 surfaceless_free_images(struct dri2_egl_surface *dri2_surf)
  55 {
  56    struct dri2_egl_display *dri2_dpy =
  57       dri2_egl_display(dri2_surf->base.Resource.Display);
  58
  59    if (dri2_surf->front) {
  60       dri2_dpy->image->destroyImage(dri2_surf->front);
  61       dri2_surf->front = NULL;
  62    }
  63
  64    free(dri2_surf->swrast_device_buffer);
  65    dri2_surf->swrast_device_buffer = NULL;
  66 }
  67
  68 static int
  69 surfaceless_image_get_buffers(__DRIdrawable *driDrawable,
  70                         unsigned int format,
  71                         uint32_t *stamp,
  72                         void *loaderPrivate,
  73                         uint32_t buffer_mask,
  74                         struct __DRIimageList *buffers)
  75 {
  76    struct dri2_egl_surface *dri2_surf = loaderPrivate;
  77    struct dri2_egl_display *dri2_dpy =
  78       dri2_egl_display(dri2_surf->base.Resource.Display);
  79
  80    buffers->image_mask = 0;
  81    buffers->front = NULL;
  82    buffers->back = NULL;
  83
  84    /* The EGL 1.5 spec states that pbuffers are single-buffered. Specifically,
  85     * the spec states that they have a back buffer but no front buffer, in
  86     * contrast to pixmaps, which have a front buffer but no back buffer.
  87     *
  88     * Single-buffered surfaces with no front buffer confuse Mesa; so we deviate
  89     * from the spec, following the precedent of Mesa's EGL X11 platform. The
  90     * X11 platform correctly assigns pbuffers to single-buffered configs, but
  91     * assigns the pbuffer a front buffer instead of a back buffer.
  92     *
  93     * Pbuffers in the X11 platform mostly work today, so let's just copy its
  94     * behavior instead of trying to fix (and hence potentially breaking) the
  95     * world.
  96     */
  97
  98    if (buffer_mask & __DRI_IMAGE_BUFFER_FRONT) {
  99
 100       if (!dri2_surf->front)
 101          dri2_surf->front =
 102             surfaceless_alloc_image(dri2_dpy, dri2_surf);
 103
 104       buffers->image_mask |= __DRI_IMAGE_BUFFER_FRONT;
 105       buffers->front = dri2_surf->front;
 106    }
 107
 108    return 1;
 109 }
 110
 111 static _EGLSurface *
 112 dri2_surfaceless_create_surface(_EGLDriver *drv, _EGLDisplay *disp, EGLint type,
 113                         _EGLConfig *conf, const EGLint *attrib_list)
 114 {
 115    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
 116    struct dri2_egl_config *dri2_conf = dri2_egl_config(conf);
 117    struct dri2_egl_surface *dri2_surf;
 118    const __DRIconfig *config;
 119
 120    /* Make sure to calloc so all pointers
 121     * are originally NULL.
 122     */
 123    dri2_surf = calloc(1, sizeof *dri2_surf);
 124
 125    if (!dri2_surf) {
 126       _eglError(EGL_BAD_ALLOC, "eglCreatePbufferSurface");
 127       return NULL;
 128    }
 129
 130    if (!dri2_init_surface(&dri2_surf->base, disp, type, conf, attrib_list,
 131                           false, NULL))
 132       goto cleanup_surface;
 133
 134    config = dri2_get_dri_config(dri2_conf, type,
 135                                 dri2_surf->base.GLColorspace);
 136
 137    if (!config) {
 138       _eglError(EGL_BAD_MATCH, "Unsupported surfacetype/colorspace configuration");
 139       goto cleanup_surface;
 140    }
 141
 142    dri2_surf->visual = dri2_image_format_for_pbuffer_config(dri2_dpy, config);
 143    if (dri2_surf->visual == __DRI_IMAGE_FORMAT_NONE)
 144       goto cleanup_surface;
 145
 146    if (!dri2_create_drawable(dri2_dpy, config, dri2_surf, dri2_surf))
 147       goto cleanup_surface;
 148
 149    return &dri2_surf->base;
 150
 151    cleanup_surface:
 152       free(dri2_surf);
 153       return NULL;
 154 }
 155
 156 static EGLBoolean
 157 surfaceless_destroy_surface(_EGLDriver *drv, _EGLDisplay *disp, _EGLSurface *surf)
 158 {
 159    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
 160    struct dri2_egl_surface *dri2_surf = dri2_egl_surface(surf);
 161
 162    surfaceless_free_images(dri2_surf);
 163
 164    dri2_dpy->core->destroyDrawable(dri2_surf->dri_drawable);
 165
 166    dri2_fini_surface(surf);
 167    free(dri2_surf);
 168    return EGL_TRUE;
 169 }
 170
 171 static _EGLSurface *
 172 dri2_surfaceless_create_pbuffer_surface(_EGLDriver *drv, _EGLDisplay *disp,
 173                                 _EGLConfig *conf, const EGLint *attrib_list)
 174 {
 175    return dri2_surfaceless_create_surface(drv, disp, EGL_PBUFFER_BIT, conf,
 176                                   attrib_list);
 177 }
 178
 179 static const struct dri2_egl_display_vtbl dri2_surfaceless_display_vtbl = {
 180    .create_pbuffer_surface = dri2_surfaceless_create_pbuffer_surface,
 181    .destroy_surface = surfaceless_destroy_surface,
 182    .create_image = dri2_create_image_khr,
 183    .get_sync_values = dri2_fallback_get_sync_values,
 184    .get_dri_drawable = dri2_surface_get_dri_drawable,
 185 };
 186
 187 static void
 188 surfaceless_flush_front_buffer(__DRIdrawable *driDrawable, void *loaderPrivate)
 189 {
 190 }
 191
 192 static unsigned
 193 surfaceless_get_capability(void *loaderPrivate, enum dri_loader_cap cap)
 194 {
 195    /* Note: loaderPrivate is _EGLDisplay* */
 196    switch (cap) {
 197    case DRI_LOADER_CAP_FP16:
 198       return 1;
 199    default:
 200       return 0;
 201    }
 202 }
 203
 204 static const __DRIimageLoaderExtension image_loader_extension = {
 205    .base             = { __DRI_IMAGE_LOADER, 2 },
 206    .getBuffers       = surfaceless_image_get_buffers,
 207    .flushFrontBuffer = surfaceless_flush_front_buffer,
 208    .getCapability    = surfaceless_get_capability,
 209 };
 210
 211 static const __DRIextension *image_loader_extensions[] = {
 212    &image_loader_extension.base,
 213    &image_lookup_extension.base,
 214    &use_invalidate.base,
 215    NULL,
 216 };
 217
 218 static const __DRIextension *swrast_loader_extensions[] = {
 219    &swrast_pbuffer_loader_extension.base,
 220    &image_loader_extension.base,
 221    &image_lookup_extension.base,
 222    &use_invalidate.base,
 223    NULL,
 224 };
 225
 226 static bool
 227 surfaceless_probe_device(_EGLDisplay *disp, bool swrast)
 228 {
 229 #define MAX_DRM_DEVICES 64
 230    const unsigned node_type = swrast ? DRM_NODE_PRIMARY : DRM_NODE_RENDER;
 231    struct dri2_egl_display *dri2_dpy = disp->DriverData;
 232    drmDevicePtr device, devices[MAX_DRM_DEVICES] = { NULL };
 233    int i, num_devices;
 234
 235    num_devices = drmGetDevices2(0, devices, ARRAY_SIZE(devices));
 236    if (num_devices < 0)
 237       return false;
 238
 239    for (i = 0; i < num_devices; ++i) {
 240       device = devices[i];
 241
 242       if (!(device->available_nodes & (1 << node_type)))
 243          continue;
 244
 245       dri2_dpy->fd = loader_open_device(device->nodes[node_type]);
 246       if (dri2_dpy->fd < 0)
 247          continue;
 248
 249       disp->Device = _eglAddDevice(dri2_dpy->fd, swrast);
 250       if (!disp->Device) {
 251          close(dri2_dpy->fd);
 252          dri2_dpy->fd = -1;
 253          continue;
 254       }
 255
 256       char *driver_name = loader_get_driver_for_fd(dri2_dpy->fd);
 257       if (swrast) {
 258          /* Use kms swrast only with vgem / virtio_gpu.
 259           * virtio-gpu fallbacks to software rendering when 3D features
 260           * are unavailable since 6c5ab, and kms_swrast is more
 261           * feature complete than swrast.
 262           */
 263          if (driver_name &&
 264              (strcmp(driver_name, "vgem") == 0 ||
 265               strcmp(driver_name, "virtio_gpu") == 0))
 266             dri2_dpy->driver_name = strdup("kms_swrast");
 267          free(driver_name);
 268       } else {
 269          /* Use the given hardware driver */
 270          dri2_dpy->driver_name = driver_name;
 271       }
 272
 273       if (dri2_dpy->driver_name && dri2_load_driver_dri3(disp))
 274          break;
 275
 276       free(dri2_dpy->driver_name);
 277       dri2_dpy->driver_name = NULL;
 278       close(dri2_dpy->fd);
 279       dri2_dpy->fd = -1;
 280    }
 281    drmFreeDevices(devices, num_devices);
 282
 283    if (i == num_devices)
 284       return false;
 285
 286    if (swrast)
 287       dri2_dpy->loader_extensions = swrast_loader_extensions;
 288    else
 289       dri2_dpy->loader_extensions = image_loader_extensions;
 290
 291    return true;
 292 }
 293
 294 static bool
 295 surfaceless_probe_device_sw(_EGLDisplay *disp)
 296 {
 297    struct dri2_egl_display *dri2_dpy = disp->DriverData;
 298
 299    dri2_dpy->fd = -1;
 300    disp->Device = _eglAddDevice(dri2_dpy->fd, true);
 301    assert(disp->Device);
 302
 303    dri2_dpy->driver_name = strdup("swrast");
 304    if (!dri2_dpy->driver_name)
 305       return false;
 306
 307    if (!dri2_load_driver_swrast(disp)) {
 308       free(dri2_dpy->driver_name);
 309       dri2_dpy->driver_name = NULL;
 310       return false;
 311    }
 312
 313    dri2_dpy->loader_extensions = swrast_loader_extensions;
 314    return true;
 315 }
 316
 317 EGLBoolean
 318 dri2_initialize_surfaceless(_EGLDriver *drv, _EGLDisplay *disp)
 319 {
 320    struct dri2_egl_display *dri2_dpy;
 321    const char* err;
 322    bool driver_loaded = false;
 323
 324    dri2_dpy = calloc(1, sizeof *dri2_dpy);
 325    if (!dri2_dpy)
 326       return _eglError(EGL_BAD_ALLOC, "eglInitialize");
 327
 328    dri2_dpy->fd = -1;
 329    disp->DriverData = (void *) dri2_dpy;
 330
 331    if (!disp->Options.ForceSoftware) {
 332       driver_loaded = surfaceless_probe_device(disp, false);
 333       if (!driver_loaded)
 334          _eglLog(_EGL_WARNING,
 335                  "No hardware driver found, falling back to software rendering");
 336    }
 337
 338    if (!driver_loaded)
 339       driver_loaded = surfaceless_probe_device(disp, true);
 340
 341    if (!driver_loaded) {
 342       _eglLog(_EGL_DEBUG, "Falling back to surfaceless swrast without DRM.");
 343       if (!surfaceless_probe_device_sw(disp)) {
 344          err = "DRI2: failed to load driver";
 345          goto cleanup;
 346       }
 347    }
 348
 349    if (!dri2_create_screen(disp)) {
 350       err = "DRI2: failed to create screen";
 351       goto cleanup;
 352    }
 353
 354    if (!dri2_setup_extensions(disp)) {
 355       err = "DRI2: failed to find required DRI extensions";
 356       goto cleanup;
 357    }
 358
 359    dri2_setup_screen(disp);
 360 #ifdef HAVE_WAYLAND_PLATFORM
 361    dri2_dpy->device_name = loader_get_device_name_for_fd(dri2_dpy->fd);
 362 #endif
 363    dri2_set_WL_bind_wayland_display(drv, disp);
 364
 365    if (!dri2_add_pbuffer_configs_for_visuals(drv, disp)) {
 366       err = "DRI2: failed to add configs";
 367       goto cleanup;
 368    }
 369
 370    /* Fill vtbl last to prevent accidentally calling virtual function during
 371     * initialization.
 372     */
 373    dri2_dpy->vtbl = &dri2_surfaceless_display_vtbl;
 374
 375    return EGL_TRUE;
 376
 377 cleanup:
 378    dri2_display_destroy(disp);
 379    return _eglError(EGL_NOT_INITIALIZED, err);
 380 }