From 9422cf7c105106d794d4d2fb32822ab287e79422 Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Fri, 14 Jun 2019 12:51:13 -0400
Subject: [PATCH] gl_texture_cache: Use Stream Buffers instead of Persistant
 for Buffer Copies.

---
 src/video_core/renderer_opengl/gl_resource_manager.cpp | 5 ++---
 src/video_core/renderer_opengl/gl_resource_manager.h   | 2 +-
 src/video_core/renderer_opengl/gl_texture_cache.cpp    | 2 +-
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/src/video_core/renderer_opengl/gl_resource_manager.cpp b/src/video_core/renderer_opengl/gl_resource_manager.cpp
index a1f91d6775..9f840a42eb 100644
--- a/src/video_core/renderer_opengl/gl_resource_manager.cpp
+++ b/src/video_core/renderer_opengl/gl_resource_manager.cpp
@@ -148,12 +148,11 @@ void OGLBuffer::Release() {
     handle = 0;
 }
 
-void OGLBuffer::MakePersistant(std::size_t buffer_size) {
+void OGLBuffer::MakeStreamCopy(std::size_t buffer_size) {
     if (handle == 0 || buffer_size == 0)
         return;
 
-    const GLbitfield flags = GL_MAP_PERSISTENT_BIT | GL_MAP_WRITE_BIT | GL_MAP_READ_BIT;
-    glNamedBufferStorage(handle, static_cast<GLsizeiptr>(buffer_size), nullptr, flags);
+    glNamedBufferData(handle, buffer_size, nullptr, GL_STREAM_COPY);
 }
 
 void OGLSync::Create() {
diff --git a/src/video_core/renderer_opengl/gl_resource_manager.h b/src/video_core/renderer_opengl/gl_resource_manager.h
index f2873ef96a..b2aa558a1f 100644
--- a/src/video_core/renderer_opengl/gl_resource_manager.h
+++ b/src/video_core/renderer_opengl/gl_resource_manager.h
@@ -187,7 +187,7 @@ public:
     void Release();
 
     // Converts the buffer into a persistant storage buffer
-    void MakePersistant(std::size_t buffer_size);
+    void MakeStreamCopy(std::size_t buffer_size);
 
     GLuint handle = 0;
 };
diff --git a/src/video_core/renderer_opengl/gl_texture_cache.cpp b/src/video_core/renderer_opengl/gl_texture_cache.cpp
index edb4e31770..892f286b74 100644
--- a/src/video_core/renderer_opengl/gl_texture_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_texture_cache.cpp
@@ -599,7 +599,7 @@ GLuint TextureCacheOpenGL::FetchPBO(std::size_t buffer_size) {
     if (cp.handle == 0) {
         const std::size_t ceil_size = 1ULL << l2;
         cp.Create();
-        cp.MakePersistant(ceil_size);
+        cp.MakeStreamCopy(ceil_size);
     }
     return cp.handle;
 }