exo/clients: Pass modifiers when creating dma-buf buffers

This makes the sample clients pass along the format modifier when
creating buffers.  The modifier describes the buffer layout (linear,
tiled, compressed and such) and lets us use more efficient layouts.

BUG=b:145579089, b:79682290
TEST=wayland_rects_client --use-drm=msm and verify modifiers get passed

Change-Id: Ic5cbd5e5a014d26bed9ac5ea4d10f4037cc60fd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314983
Commit-Queue: Kristian H. Kristensen <hoegsberg@chromium.org>
Reviewed-by: Fritz Koenig <frkoenig@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793365}

components/exo/wayland/clients/client_base.cc

@@ -916,6 +916,7 @@ std::unique_ptr<ClientBase::Buffer> ClientBase::CreateDrmBuffer(
 
     buffer->params.reset(
         zwp_linux_dmabuf_v1_create_params(globals_.linux_dmabuf.get()));
+    uint64_t modifier = gbm_bo_get_modifier(buffer->bo.get());
     for (size_t i = 0;
          i < static_cast<size_t>(gbm_bo_get_plane_count(buffer->bo.get()));
          ++i) {
@@ -923,7 +924,7 @@ std::unique_ptr<ClientBase::Buffer> ClientBase::CreateDrmBuffer(
       uint32_t stride = gbm_bo_get_stride_for_plane(buffer->bo.get(), i);
       uint32_t offset = gbm_bo_get_offset(buffer->bo.get(), i);
       zwp_linux_buffer_params_v1_add(buffer->params.get(), fd.get(), i, offset,
-                                     stride, 0, 0);
+                                     stride, modifier >> 32, modifier);
     }
     uint32_t flags = 0;
     if (y_invert)
@@ -948,6 +949,10 @@ std::unique_ptr<ClientBase::Buffer> ClientBase::CreateDrmBuffer(
         gbm_bo_get_stride_for_plane(buffer->bo.get(), 0),
         EGL_DMA_BUF_PLANE0_OFFSET_EXT,
         0,
+        EGL_DMA_BUF_PLANE0_MODIFIER_LO_EXT,
+        modifier,
+        EGL_DMA_BUF_PLANE0_MODIFIER_HI_EXT,
+        modifier >> 32,
         EGL_NONE};
     EGLImageKHR image = eglCreateImageKHR(
         eglGetCurrentDisplay(), EGL_NO_CONTEXT, EGL_LINUX_DMA_BUF_EXT,