gbm: Add dri backend

1 files changed, 378 insertions, 0 deletions

diff --git a/src/gbm/backends/dri/gbm_dri.c b/src/gbm/backends/dri/gbm_dri.c
new file mode 100644
index 00000000000..6bb7848d830
--- /dev/null
+++ b/src/gbm/backends/dri/gbm_dri.c
@@ -0,0 +1,378 @@
+/*
+ * Copyright © 2011 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Benjamin Franzke <[email protected]>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <limits.h>
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <dlfcn.h>
+
+#include <GL/gl.h> /* dri_interface needs GL types */
+#include <GL/internal/dri_interface.h>
+
+#include "gbm_driint.h"
+
+#include "gbmint.h"
+
+static __DRIimage *
+dri_lookup_egl_image(__DRIscreen *screen, void *image, void *data)
+{
+   struct gbm_dri_device *dri = data;
+
+   if (dri->lookup_image == NULL)
+      return NULL;
+
+   return dri->lookup_image(screen, image, dri->lookup_user_data);
+}
+
+const __DRIuseInvalidateExtension use_invalidate = {
+   { __DRI_USE_INVALIDATE, 1 }
+};
+
+const __DRIimageLookupExtension image_lookup_extension = {
+   { __DRI_IMAGE_LOOKUP, 1 },
+   dri_lookup_egl_image
+};
+
+struct dri_extension_match {
+   const char *name;
+   int version;
+   int offset;
+};
+
+static struct dri_extension_match dri_core_extensions[] = {
+   { __DRI_IMAGE, 1, offsetof(struct gbm_dri_device, image) },
+   { NULL, 0, 0 }
+};
+
+static struct dri_extension_match gbm_dri_device_extensions[] = {
+   { __DRI_CORE, 1, offsetof(struct gbm_dri_device, core) },
+   { __DRI_DRI2, 1, offsetof(struct gbm_dri_device, dri2) },
+   { NULL, 0, 0 }
+};
+
+static int
+dri_bind_extensions(struct gbm_dri_device *dri,
+                    struct dri_extension_match *matches,
+                    const __DRIextension **extensions)
+{
+   int i, j, ret = 0;
+   void *field;
+
+   for (i = 0; extensions[i]; i++) {
+      for (j = 0; matches[j].name; j++) {
+         if (strcmp(extensions[i]->name, matches[j].name) == 0 &&
+             extensions[i]->version >= matches[j].version) {
+            field = ((char *) dri + matches[j].offset);
+            *(const __DRIextension **) field = extensions[i];
+         }
+      }
+   }
+
+   for (j = 0; matches[j].name; j++) {
+      field = ((char *) dri + matches[j].offset);
+      if (*(const __DRIextension **) field == NULL) {
+         ret = -1;
+      }
+   }
+
+   return ret;
+}
+
+static int
+dri_load_driver(struct gbm_dri_device *dri)
+{
+   const __DRIextension **extensions;
+   char path[PATH_MAX], *search_paths, *p, *next, *end;
+
+   search_paths = NULL;
+   if (geteuid() == getuid()) {
+      /* don't allow setuid apps to use GBM_DRIVERS_PATH */
+      search_paths = getenv("GBM_DRIVERS_PATH");
+   }
+   if (search_paths == NULL)
+      search_paths = DEFAULT_DRIVER_DIR;
+
+   dri->driver = NULL;
+   end = search_paths + strlen(search_paths);
+   for (p = search_paths; p < end && dri->driver == NULL; p = next + 1) {
+      int len;
+      next = strchr(p, ':');
+      if (next == NULL)
+         next = end;
+
+      len = next - p;
+#if GLX_USE_TLS
+      snprintf(path, sizeof path,
+               "%.*s/tls/%s_dri.so", len, p, dri->base.driver_name);
+      dri->driver = dlopen(path, RTLD_NOW | RTLD_GLOBAL);
+#endif
+      if (dri->driver == NULL) {
+         snprintf(path, sizeof path,
+                  "%.*s/%s_dri.so", len, p, dri->base.driver_name);
+         dri->driver = dlopen(path, RTLD_NOW | RTLD_GLOBAL);
+         if (dri->driver == NULL)
+            fprintf(stderr, "failed to open %s: %s\n", path, dlerror());
+      }
+   }
+
+   if (dri->driver == NULL) {
+      fprintf(stderr, "gbm: failed to open any driver (search paths %s)",
+              search_paths);
+      return -1;
+   }
+
+   extensions = dlsym(dri->driver, __DRI_DRIVER_EXTENSIONS);
+   if (extensions == NULL) {
+      fprintf(stderr, "gbm: driver exports no extensions (%s)", dlerror());
+      dlclose(dri->driver);
+      return -1;
+   }
+
+
+   if (dri_bind_extensions(dri, gbm_dri_device_extensions, extensions) < 0) {
+      dlclose(dri->driver);
+      fprintf(stderr, "failed to bind extensions\n");
+      return -1;
+   }
+
+   return 0;
+}
+
+static int
+dri_screen_create(struct gbm_dri_device *dri)
+{
+   const __DRIextension **extensions;
+   int ret = 0;
+
+   dri->base.driver_name = dri_fd_get_driver_name(dri->base.base.fd);
+   if (dri->base.driver_name == NULL)
+      return -1;
+
+   ret = dri_load_driver(dri);
+   if (ret) {
+      fprintf(stderr, "failed to load driver: %s\n", dri->base.driver_name);
+      return ret;
+   };
+
+   dri->extensions[0] = &image_lookup_extension.base;
+   dri->extensions[1] = &use_invalidate.base;
+   dri->extensions[2] = NULL;
+
+   if (dri->dri2 == NULL)
+      return -1;
+
+   dri->screen = dri->dri2->createNewScreen(0, dri->base.base.fd,
+                                            dri->extensions,
+                                            &dri->driver_configs, dri);
+
+   extensions = dri->core->getExtensions(dri->screen);
+   if (dri_bind_extensions(dri, dri_core_extensions, extensions) < 0) {
+      ret = -1;
+      goto free_screen;
+   }
+
+   dri->lookup_image = NULL;
+   dri->lookup_user_data = NULL;
+
+   return 0;
+
+free_screen:
+   dri->core->destroyScreen(dri->screen);
+
+   return ret;
+}
+
+static int
+gbm_dri_is_format_supported(struct gbm_device *gbm,
+                            enum gbm_bo_format format,
+                            uint32_t usage)
+{
+   switch (format) {
+   case GBM_BO_FORMAT_XRGB8888:
+      break;
+   case GBM_BO_FORMAT_ARGB8888:
+      if (usage & GBM_BO_USE_SCANOUT)
+         return 0;
+      break;
+   default:
+      return 0;
+   }
+
+   if (usage & GBM_BO_USE_CURSOR_64X64 &&
+       usage & GBM_BO_USE_RENDERING)
+      return 0;
+
+   return 1;
+}
+
+static void
+gbm_dri_bo_destroy(struct gbm_bo *_bo)
+{
+   struct gbm_dri_device *dri = gbm_dri_device(_bo->gbm);
+   struct gbm_dri_bo *bo = gbm_dri_bo(_bo);
+
+   dri->image->destroyImage(bo->image);
+   free(bo);
+}
+
+static struct gbm_bo *
+gbm_dri_bo_create_from_egl_image(struct gbm_device *gbm,
+                                 void *egl_dpy, void *egl_img,
+                                 uint32_t width, uint32_t height,
+                                 uint32_t usage)
+{
+   struct gbm_dri_device *dri = gbm_dri_device(gbm);
+   struct gbm_dri_bo *bo;
+
+   (void) egl_dpy;
+
+   if (dri->lookup_image == NULL)
+      return NULL;
+
+   bo = calloc(1, sizeof *bo);
+   if (bo == NULL)
+      return NULL;
+
+   bo->base.base.gbm = gbm;
+   bo->base.base.width = width;
+   bo->base.base.height = height;
+
+   __DRIimage *tmp = dri->lookup_image(dri->screen, egl_img,
+                                       dri->lookup_user_data);
+
+   bo->image = dri->image->dupImage(tmp, bo);
+   if (bo->image == NULL)
+      return NULL;
+   
+   dri->image->queryImage(bo->image, __DRI_IMAGE_ATTRIB_HANDLE,
+                          &bo->base.base.handle.s32);
+   dri->image->queryImage(bo->image, __DRI_IMAGE_ATTRIB_STRIDE,
+                          (int *) &bo->base.base.pitch);
+
+   return &bo->base.base;
+}
+
+static struct gbm_bo *
+gbm_dri_bo_create(struct gbm_device *gbm,
+                  uint32_t width, uint32_t height,
+                  enum gbm_bo_format format, uint32_t usage)
+{
+   struct gbm_dri_device *dri = gbm_dri_device(gbm);
+   struct gbm_dri_bo *bo;
+   int dri_format;
+   unsigned dri_use = 0;
+
+   bo = calloc(1, sizeof *bo);
+   if (bo == NULL)
+      return NULL;
+
+   bo->base.base.gbm = gbm;
+   bo->base.base.width = width;
+   bo->base.base.height = height;
+
+   switch (format) {
+   case GBM_BO_FORMAT_XRGB8888:
+      dri_format = __DRI_IMAGE_FORMAT_XRGB8888;
+      break;
+   case GBM_BO_FORMAT_ARGB8888:
+      dri_format = __DRI_IMAGE_FORMAT_ARGB8888;
+      break;
+   default:
+      return NULL;
+   }
+
+   if (usage & GBM_BO_USE_SCANOUT)
+      dri_use |= __DRI_IMAGE_USE_SCANOUT;
+   if (usage & GBM_BO_USE_CURSOR_64X64)
+      dri_use |= __DRI_IMAGE_USE_CURSOR;
+
+   bo->image =
+      dri->image->createImage(dri->screen,
+                              width, height,
+                              dri_format, dri_use,
+                              bo);
+   if (bo->image == NULL)
+      return NULL;
+
+   dri->image->queryImage(bo->image, __DRI_IMAGE_ATTRIB_HANDLE,
+                          &bo->base.base.handle.s32);
+   dri->image->queryImage(bo->image, __DRI_IMAGE_ATTRIB_STRIDE,
+                          (int *) &bo->base.base.pitch);
+
+   return &bo->base.base;
+}
+
+static void
+dri_destroy(struct gbm_device *gbm)
+{
+   struct gbm_dri_device *dri = gbm_dri_device(gbm);
+
+   dri->core->destroyScreen(dri->screen);
+   free(dri->driver_configs);
+   dlclose(dri->driver);
+   free(dri->base.driver_name);
+
+   free(dri);
+}
+
+static struct gbm_device *
+dri_device_create(int fd)
+{
+   struct gbm_dri_device *dri;
+   int ret;
+
+   dri = calloc(1, sizeof *dri);
+
+   dri->base.base.fd = fd;
+   dri->base.base.bo_create = gbm_dri_bo_create;
+   dri->base.base.bo_create_from_egl_image = gbm_dri_bo_create_from_egl_image;
+   dri->base.base.is_format_supported = gbm_dri_is_format_supported;
+   dri->base.base.bo_destroy = gbm_dri_bo_destroy;
+   dri->base.base.destroy = dri_destroy;
+
+   dri->base.type = GBM_DRM_DRIVER_TYPE_DRI;
+   dri->base.base.name = "drm";
+
+   ret = dri_screen_create(dri);
+   if (ret) {
+      free(dri);
+      return NULL;
+   }
+
+   return &dri->base.base;
+}
+
+struct gbm_backend gbm_dri_backend = {
+   .backend_name = "dri",
+   .create_device = dri_device_create,
+};