From a90c2843a756b05043682d69de0aa8d8d5afd5a5 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Sun, 13 May 2018 21:34:38 +0200
Subject: [PATCH] [dxvk] Remove std::vector from DxvkDataBuffer

Vectors are zero-initialized upon resize, which is unnecessary
in this case and potentially impacts performance.
---
 src/dxvk/dxvk_data.cpp | 10 ++++++----
 src/dxvk/dxvk_data.h   |  7 ++++---
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/dxvk/dxvk_data.cpp b/src/dxvk/dxvk_data.cpp
index ebcc06b1..bece0efd 100644
--- a/src/dxvk/dxvk_data.cpp
+++ b/src/dxvk/dxvk_data.cpp
@@ -5,17 +5,19 @@
 namespace dxvk {
   
   DxvkDataBuffer:: DxvkDataBuffer() { }
-  DxvkDataBuffer::~DxvkDataBuffer() { }
+  DxvkDataBuffer::DxvkDataBuffer(size_t size)
+  : m_data(new char[size]), m_size(size) { }
   
-  DxvkDataBuffer::DxvkDataBuffer(size_t size) {
-    m_data.resize(size);
+  
+  DxvkDataBuffer::~DxvkDataBuffer() {
+    delete[] m_data;
   }
   
   
   DxvkDataSlice DxvkDataBuffer::alloc(size_t n) {
     const size_t offset = m_offset;
     
-    if (offset + n <= m_data.size()) {
+    if (offset + n <= m_size) {
       m_offset += align(n, CACHE_LINE_SIZE);
       return DxvkDataSlice(this, offset, n);
     } return DxvkDataSlice();
diff --git a/src/dxvk/dxvk_data.h b/src/dxvk/dxvk_data.h
index 097f10ad..2a5ee924 100644
--- a/src/dxvk/dxvk_data.h
+++ b/src/dxvk/dxvk_data.h
@@ -35,8 +35,9 @@ namespace dxvk {
     
   private:
     
-    std::vector<char> m_data;
-    size_t            m_offset = 0;
+    char*   m_data   = nullptr;
+    size_t  m_size   = 0;
+    size_t  m_offset = 0;
     
   };
   
@@ -62,7 +63,7 @@ namespace dxvk {
     
     void* ptr() const {
       return m_buffer != nullptr
-        ? m_buffer->m_data.data() + m_offset
+        ? m_buffer->m_data + m_offset
         : nullptr;
     }