Initialize memory for vulkan swapchain images.

gpu/vulkan/vulkan_swap_chain.cc

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/vulkan/vulkan_swap_chain.h"
 
 #include "gpu/vulkan/vulkan_command_buffer.h"
 #include "gpu/vulkan/vulkan_command_pool.h"
 #include "gpu/vulkan/vulkan_device_queue.h"
 #include "gpu/vulkan/vulkan_image_view.h"
@@ skipping 185 matching lines @@
     result = vkCreateSemaphore(device, &semaphore_create_info, nullptr,
                                &image_data->present_semaphore);
     if (VK_SUCCESS != result) {
       DLOG(ERROR) << "vkCreateSemaphore(present) failed: " << result;
       return false;
     }
 
     // Initialize the command buffer for this buffer data.
     image_data->command_buffer = command_pool_->CreatePrimaryCommandBuffer();
 
-    // Setup the Image Layout as the first command that gets issued in each
-    // command buffer.
-    ScopedSingleUseCommandBufferRecorder recorder(*image_data->command_buffer);
-    image_memory_barrier.image = images[i];
-    vkCmdPipelineBarrier(recorder.handle(), VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
-                         VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT, 0, 0, nullptr, 0,
-                         nullptr, 1, &image_memory_barrier);
+    {
+      // Setup the Image Layout as the first command that gets issued in each
+      // command buffer.
+      ScopedSingleUseCommandBufferRecorder recorder(
+          *image_data->command_buffer);
+      image_memory_barrier.image = images[i];
+      vkCmdPipelineBarrier(recorder.handle(), VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
+                           VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT, 0, 0, nullptr, 0,
+                           nullptr, 1, &image_memory_barrier);
+
+      VkClearColorValue clear_color = { { 0.0f, 0.0f, 0.0f, 0.0f } };
+      vkCmdClearColorImage(recorder.handle(), images[i],
+                           VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
+                           &clear_color, 1, &image_subresource_range);
+    }
+
+    // First submit to fill the image memory.
+    if (!image_data->command_buffer->Submit(0, VK_NULL_HANDLE,
+                                            1, &image_data->render_semaphore)) {
+      return false;
+    }
 
     // Create the image view.
     image_data->image_view.reset(new VulkanImageView(device_queue_));
     if (!image_data->image_view->Initialize(
             images[i], VK_IMAGE_VIEW_TYPE_2D, VulkanImageView::IMAGE_TYPE_COLOR,
             surface_format.format, size_.width(), size_.height(), 0, 1, 0, 1)) {
       return false;
     }
   }
 
@@ skipping 61 matching lines @@
     command_pool_->Destroy();
     command_pool_.reset();
   }
 }
 
 VulkanSwapChain::ImageData::ImageData() {}
 
 VulkanSwapChain::ImageData::~ImageData() {}
 
 }  // namespace gpu