From deadcb39c2914d77734907daf7ce304872265798 Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Sun, 11 Feb 2018 19:04:27 -0500
Subject: [PATCH] renderer_opengl: Support framebuffer flip vertical.

---
 src/video_core/renderer_base.h                     |  1 +
 src/video_core/renderer_opengl/renderer_opengl.cpp | 14 +++++++++-----
 src/video_core/renderer_opengl/renderer_opengl.h   |  3 +++
 3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/src/video_core/renderer_base.h b/src/video_core/renderer_base.h
index 28893b181a..2aba50edae 100644
--- a/src/video_core/renderer_base.h
+++ b/src/video_core/renderer_base.h
@@ -43,6 +43,7 @@ public:
         u32 height;
         u32 stride;
         PixelFormat pixel_format;
+        bool flip_vertical;
     };
 
     virtual ~RendererBase() {}
diff --git a/src/video_core/renderer_opengl/renderer_opengl.cpp b/src/video_core/renderer_opengl/renderer_opengl.cpp
index 8c23128aec..7f921fa320 100644
--- a/src/video_core/renderer_opengl/renderer_opengl.cpp
+++ b/src/video_core/renderer_opengl/renderer_opengl.cpp
@@ -262,6 +262,8 @@ void RendererOpenGL::LoadFBToScreenInfo(const FramebufferInfo& framebuffer_info,
     // only allows rows to have a memory alignement of 4.
     ASSERT(framebuffer_info.stride % 4 == 0);
 
+    framebuffer_flip_vertical = framebuffer_info.flip_vertical;
+
     // Reset the screen info's display texture to its own permanent texture
     screen_info.display_texture = screen_info.texture.resource.handle;
     screen_info.display_texcoords = MathUtil::Rectangle<float>(0.f, 0.f, 1.f, 1.f);
@@ -401,13 +403,15 @@ void RendererOpenGL::ConfigureFramebufferTexture(TextureInfo& texture,
 
 void RendererOpenGL::DrawSingleScreen(const ScreenInfo& screen_info, float x, float y, float w,
                                       float h) {
-    auto& texcoords = screen_info.display_texcoords;
+    const auto& texcoords = screen_info.display_texcoords;
+    const auto& left = framebuffer_flip_vertical ? texcoords.right : texcoords.left;
+    const auto& right = framebuffer_flip_vertical ? texcoords.left : texcoords.right;
 
     std::array<ScreenRectVertex, 4> vertices = {{
-        ScreenRectVertex(x, y, texcoords.top, texcoords.right),
-        ScreenRectVertex(x + w, y, texcoords.bottom, texcoords.right),
-        ScreenRectVertex(x, y + h, texcoords.top, texcoords.left),
-        ScreenRectVertex(x + w, y + h, texcoords.bottom, texcoords.left),
+        ScreenRectVertex(x, y, texcoords.top, right),
+        ScreenRectVertex(x + w, y, texcoords.bottom, right),
+        ScreenRectVertex(x, y + h, texcoords.top, left),
+        ScreenRectVertex(x + w, y + h, texcoords.bottom, left),
     }};
 
     state.texture_units[0].texture_2d = screen_info.display_texture;
diff --git a/src/video_core/renderer_opengl/renderer_opengl.h b/src/video_core/renderer_opengl/renderer_opengl.h
index db6c355a51..05bb3c5cf1 100644
--- a/src/video_core/renderer_opengl/renderer_opengl.h
+++ b/src/video_core/renderer_opengl/renderer_opengl.h
@@ -86,4 +86,7 @@ private:
     // Shader attribute input indices
     GLuint attrib_position;
     GLuint attrib_tex_coord;
+
+    /// Flips the framebuffer vertically when true
+    bool framebuffer_flip_vertical;
 };