From ff4f67492bff68d8b34aebc9ea6c85ca34e02b71 Mon Sep 17 00:00:00 2001
From: Shawn Hoffman <godisgovernment@gmail.com>
Date: Tue, 15 Sep 2020 05:00:24 -0700
Subject: normalize common filenames in VideoBackends/OGL

---
 Source/Core/VideoBackends/OGL/OGLBoundingBox.cpp | 78 ++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 Source/Core/VideoBackends/OGL/OGLBoundingBox.cpp

(limited to 'Source/Core/VideoBackends/OGL/OGLBoundingBox.cpp')

diff --git a/Source/Core/VideoBackends/OGL/OGLBoundingBox.cpp b/Source/Core/VideoBackends/OGL/OGLBoundingBox.cpp
new file mode 100644
index 0000000000..9e88767afc
--- /dev/null
+++ b/Source/Core/VideoBackends/OGL/OGLBoundingBox.cpp
@@ -0,0 +1,78 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <cstring>
+
+#include "Common/GL/GLUtil.h"
+
+#include "VideoBackends/OGL/OGLBoundingBox.h"
+#include "VideoBackends/OGL/OGLRender.h"
+
+#include "VideoCommon/DriverDetails.h"
+#include "VideoCommon/VideoConfig.h"
+
+static GLuint s_bbox_buffer_id;
+
+namespace OGL
+{
+void BoundingBox::Init()
+{
+  if (!g_ActiveConfig.backend_info.bSupportsBBox)
+    return;
+
+  int initial_values[4] = {0, 0, 0, 0};
+  glGenBuffers(1, &s_bbox_buffer_id);
+  glBindBuffer(GL_SHADER_STORAGE_BUFFER, s_bbox_buffer_id);
+  glBufferData(GL_SHADER_STORAGE_BUFFER, 4 * sizeof(s32), initial_values, GL_DYNAMIC_DRAW);
+  glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, s_bbox_buffer_id);
+}
+
+void BoundingBox::Shutdown()
+{
+  if (!g_ActiveConfig.backend_info.bSupportsBBox)
+    return;
+
+  glDeleteBuffers(1, &s_bbox_buffer_id);
+}
+
+void BoundingBox::Set(int index, int value)
+{
+  if (!g_ActiveConfig.backend_info.bSupportsBBox)
+    return;
+
+  glBindBuffer(GL_SHADER_STORAGE_BUFFER, s_bbox_buffer_id);
+  glBufferSubData(GL_SHADER_STORAGE_BUFFER, index * sizeof(int), sizeof(int), &value);
+  glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
+}
+
+int BoundingBox::Get(int index)
+{
+  if (!g_ActiveConfig.backend_info.bSupportsBBox)
+    return 0;
+
+  int data = 0;
+  glBindBuffer(GL_SHADER_STORAGE_BUFFER, s_bbox_buffer_id);
+  if (!DriverDetails::HasBug(DriverDetails::BUG_SLOW_GETBUFFERSUBDATA) &&
+      !static_cast<Renderer*>(g_renderer.get())->IsGLES())
+  {
+    // Using glMapBufferRange to read back the contents of the SSBO is extremely slow
+    // on nVidia drivers. This is more noticeable at higher internal resolutions.
+    // Using glGetBufferSubData instead does not seem to exhibit this slowdown.
+    glGetBufferSubData(GL_SHADER_STORAGE_BUFFER, index * sizeof(int), sizeof(int), &data);
+  }
+  else
+  {
+    // Using glMapBufferRange is faster on AMD cards by a measurable margin.
+    void* ptr = glMapBufferRange(GL_SHADER_STORAGE_BUFFER, index * sizeof(int), sizeof(int),
+                                 GL_MAP_READ_BIT);
+    if (ptr)
+    {
+      memcpy(&data, ptr, sizeof(int));
+      glUnmapBuffer(GL_SHADER_STORAGE_BUFFER);
+    }
+  }
+  glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
+  return data;
+}
+};  // namespace OGL
-- 
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