From 1dcc84a4724e0ee0af1e82ed4706cb250c9c30a5 Mon Sep 17 00:00:00 2001
From: Ben Vanik <ben.vanik@gmail.com>
Date: Thu, 18 Feb 2016 18:18:13 -0800
Subject: [PATCH] Starting render passes.

---
 src/xenia/gpu/vulkan/render_cache.cc | 34 ++++++++++++++++++++++++++++
 src/xenia/gpu/vulkan/render_cache.h  |  3 +++
 2 files changed, 37 insertions(+)

diff --git a/src/xenia/gpu/vulkan/render_cache.cc b/src/xenia/gpu/vulkan/render_cache.cc
index de25fb2e3..32d9349e5 100644
--- a/src/xenia/gpu/vulkan/render_cache.cc
+++ b/src/xenia/gpu/vulkan/render_cache.cc
@@ -37,6 +37,37 @@ VkRenderPass RenderCache::BeginRenderPass(VkCommandBuffer command_buffer,
   // Lookup or construct a render pass compatible with our current state.
   VkRenderPass render_pass = nullptr;
 
+  // Begin render pass.
+  VkRenderPassBeginInfo render_pass_begin_info;
+  render_pass_begin_info.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
+  render_pass_begin_info.pNext = nullptr;
+  render_pass_begin_info.renderPass = render_pass;
+
+  // Target framebuffer.
+  // render_pass_begin_info.framebuffer = current_buffer.framebuffer;
+
+  // Render into the entire buffer (or at least tell the API we are doing
+  // this). In theory it'd be better to clip this to the scissor region, but
+  // the docs warn anything but the full framebuffer may be slow.
+  render_pass_begin_info.renderArea.offset.x = 0;
+  render_pass_begin_info.renderArea.offset.y = 0;
+  // render_pass_begin_info.renderArea.extent.width = surface_width_;
+  // render_pass_begin_info.renderArea.extent.height = surface_height_;
+
+  // Configure clear color, if clearing.
+  VkClearValue color_clear_value;
+  color_clear_value.color.float32[0] = 238 / 255.0f;
+  color_clear_value.color.float32[1] = 238 / 255.0f;
+  color_clear_value.color.float32[2] = 238 / 255.0f;
+  color_clear_value.color.float32[3] = 1.0f;
+  VkClearValue clear_values[] = {color_clear_value};
+  render_pass_begin_info.clearValueCount =
+      static_cast<uint32_t>(xe::countof(clear_values));
+  render_pass_begin_info.pClearValues = clear_values;
+
+  vkCmdBeginRenderPass(command_buffer, &render_pass_begin_info,
+                       VK_SUBPASS_CONTENTS_INLINE);
+
   return render_pass;
 }
 
@@ -44,6 +75,9 @@ void RenderCache::EndRenderPass() {
   assert_not_null(current_command_buffer_);
   auto command_buffer = current_command_buffer_;
   current_command_buffer_ = nullptr;
+
+  // End the render pass.
+  vkCmdEndRenderPass(command_buffer);
 }
 
 void RenderCache::ClearCache() {
diff --git a/src/xenia/gpu/vulkan/render_cache.h b/src/xenia/gpu/vulkan/render_cache.h
index ceeea2a07..2bdcef924 100644
--- a/src/xenia/gpu/vulkan/render_cache.h
+++ b/src/xenia/gpu/vulkan/render_cache.h
@@ -52,6 +52,9 @@ class RenderCache {
  private:
   RegisterFile* register_file_ = nullptr;
   VkDevice device_ = nullptr;
+
+  // Only valid during a BeginRenderPass/EndRenderPass block.
+  VkCommandBuffer current_command_buffer_ = nullptr;
 };
 
 }  // namespace vulkan