gralloc_handle_t

gralloc_handle_t.c

127	+   // copied from the link bebow:
128	+   // https://es.osdn.net/projects/android-x86/scm/git/external-mesa/commits/5a595cd3af15b99d266d3fd5cba41da33f1888ac
129	+
130	+   bool ubwc = false;
131	+
132	+   const uint32_t *handle_fds = (uint32_t *)gralloc_info->handle->data;
133	+   const uint32_t *handle_data = &handle_fds[gralloc_info->handle->numFds];
134	+   int dma_buf;
135	+
136	+   if (gralloc_info->handle->numFds == 1) {
137	+      /* gbm_gralloc.  TODO: modifiers support */
138	+      dma_buf = handle_fds[0];
139	+   } else if (gralloc_info->handle->numFds == 2) {
140	+      /* Qualcomm gralloc, find it at:
141	+       *
142	+       * https://android.googlesource.com/platform/hardware/qcom/display/.
143	+       *
144	+       * The gralloc_info->handle is a pointer to a struct private_handle_t
145	+       * from your platform's gralloc.  On msm8996 (a5xx) and newer grallocs
146	+       * that's libgralloc1/gr_priv_handle.h, while previously it was
147	+       * libgralloc/gralloc_priv.h.
148	+       */
149	+
150	+      if (gralloc_info->handle->numInts < 2) {
151	+         return vk_errorf(device->instance, VK_ERROR_INVALID_EXTERNAL_HANDLE,
152	+                          "VkNativeBufferANDROID::handle::numInts is %d, "
153	+                          "expected at least 2 for qcom gralloc",
154	+                          gralloc_info->handle->numFds);
155	+      }
156	+
157	+      uint32_t gmsm = ('g' << 24) | ('m' << 16) | ('s' << 8) | 'm';
158	+      if (handle_data[0] != gmsm) {
159	+         return vk_errorf(device->instance, VK_ERROR_INVALID_EXTERNAL_HANDLE,
160	+                          "private_handle_t::magic is %x, expected %x",
161	+                          handle_data[0], gmsm);
162	+      }
163	+
164	+      /* This UBWC flag was introduced in a5xx. */
165	+      ubwc = handle_data[1] & 0x08000000;
166	+
167	+      /* QCOM gralloc has two fds passed in: the actual GPU buffer, and a buffer
168	+       * of CPU-side metadata.  I haven't found any need for the metadata buffer
169	+       * yet.  See qdMetaData.h for what's in the metadata fd.
170	+       */
171	+      dma_buf = handle_fds[0];
172	+   } else {
173	+      return vk_errorf(device->instance, VK_ERROR_INVALID_EXTERNAL_HANDLE,
174	+                       "VkNativeBufferANDROID::handle::numFds is %d, "
175	+                       "expected 1 (gbm_gralloc) or 2 (qcom gralloc)",
176	+                        gralloc_info->handle->numFds);
177	+   }