From 2814bbc3dae881e20fc22e084e5ea15ded8760fd Mon Sep 17 00:00:00 2001
From: N00byKing <N00byKing@hotmail.de>
Date: Fri, 6 Apr 2018 15:25:13 +0200
Subject: [PATCH] renderer_opengl: Allow usage of Stereoscopic 3D

---
 .../renderer_opengl/renderer_opengl.cpp       | 28 ++++++++++++++-----
 .../renderer_opengl/renderer_opengl.h         |  4 +--
 2 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/src/video_core/renderer_opengl/renderer_opengl.cpp b/src/video_core/renderer_opengl/renderer_opengl.cpp
index 65c18aecc..10d3d382b 100644
--- a/src/video_core/renderer_opengl/renderer_opengl.cpp
+++ b/src/video_core/renderer_opengl/renderer_opengl.cpp
@@ -103,12 +103,13 @@ void RendererOpenGL::SwapBuffers() {
     OpenGLState prev_state = OpenGLState::GetCurState();
     state.Apply();
 
-    for (int i : {0, 1}) {
-        const auto& framebuffer = GPU::g_regs.framebuffer_config[i];
+    for (int i : {0, 1, 2}) {
+        int fb_id = i == 2 ? 1 : 0;
+        const auto& framebuffer = GPU::g_regs.framebuffer_config[fb_id];
 
         // Main LCD (0): 0x1ED02204, Sub LCD (1): 0x1ED02A04
         u32 lcd_color_addr =
-            (i == 0) ? LCD_REG_INDEX(color_fill_top) : LCD_REG_INDEX(color_fill_bottom);
+            (fb_id == 0) ? LCD_REG_INDEX(color_fill_top) : LCD_REG_INDEX(color_fill_bottom);
         lcd_color_addr = HW::VADDR_LCD + 4 * lcd_color_addr;
         LCD::Regs::ColorFill color_fill = {0};
         LCD::Read(color_fill.raw, lcd_color_addr);
@@ -129,7 +130,7 @@ void RendererOpenGL::SwapBuffers() {
                 // performance problem.
                 ConfigureFramebufferTexture(screen_infos[i].texture, framebuffer);
             }
-            LoadFBToScreenInfo(framebuffer, screen_infos[i]);
+            LoadFBToScreenInfo(framebuffer, screen_infos[i], i == 1);
 
             // Resize the texture in case the framebuffer size has changed
             screen_infos[i].texture.width = framebuffer.width;
@@ -160,10 +161,12 @@ void RendererOpenGL::SwapBuffers() {
  * Loads framebuffer from emulated memory into the active OpenGL texture.
  */
 void RendererOpenGL::LoadFBToScreenInfo(const GPU::Regs::FramebufferConfig& framebuffer,
-                                        ScreenInfo& screen_info) {
+                                        ScreenInfo& screen_info, bool right_eye) {
 
     const PAddr framebuffer_addr =
-        framebuffer.active_fb == 0 ? framebuffer.address_left1 : framebuffer.address_left2;
+        framebuffer.active_fb == 0
+            ? (!right_eye ? framebuffer.address_left1 : framebuffer.address_right1)
+            : (!right_eye ? framebuffer.address_left2 : framebuffer.address_right2);
 
     LOG_TRACE(Render_OpenGL, "0x%08x bytes from 0x%08x(%dx%d), fmt %x",
               framebuffer.stride * framebuffer.height, framebuffer_addr, (int)framebuffer.width,
@@ -397,11 +400,22 @@ void RendererOpenGL::DrawScreens() {
     if (layout.top_screen_enabled) {
         DrawSingleScreenRotated(screen_infos[0], (float)top_screen.left, (float)top_screen.top,
                                 (float)top_screen.GetWidth(), (float)top_screen.GetHeight());
+        if (Settings::values.toggle_3d) {
+            DrawSingleScreenRotated(
+                screen_infos[1], ((float)top_screen.left * 3) + (float)top_screen.GetWidth(),
+                (float)top_screen.top, (float)top_screen.GetWidth(), (float)top_screen.GetHeight());
+        }
     }
     if (layout.bottom_screen_enabled) {
-        DrawSingleScreenRotated(screen_infos[1], (float)bottom_screen.left,
+        DrawSingleScreenRotated(screen_infos[2], (float)bottom_screen.left,
                                 (float)bottom_screen.top, (float)bottom_screen.GetWidth(),
                                 (float)bottom_screen.GetHeight());
+        if (Settings::values.toggle_3d) {
+            DrawSingleScreenRotated(
+                screen_infos[2], ((float)bottom_screen.left * 3) + (float)bottom_screen.GetWidth(),
+                (float)bottom_screen.top, (float)bottom_screen.GetWidth(),
+                (float)bottom_screen.GetHeight());
+        }
     }
 
     m_current_frame++;
diff --git a/src/video_core/renderer_opengl/renderer_opengl.h b/src/video_core/renderer_opengl/renderer_opengl.h
index f827a26af..991e9475f 100644
--- a/src/video_core/renderer_opengl/renderer_opengl.h
+++ b/src/video_core/renderer_opengl/renderer_opengl.h
@@ -62,7 +62,7 @@ private:
 
     // Loads framebuffer from emulated memory into the display information structure
     void LoadFBToScreenInfo(const GPU::Regs::FramebufferConfig& framebuffer,
-                            ScreenInfo& screen_info);
+                            ScreenInfo& screen_info, bool right_eye);
     // Fills active OpenGL texture with the given RGB color.
     void LoadColorToActiveGLTexture(u8 color_r, u8 color_g, u8 color_b, const TextureInfo& texture);
 
@@ -76,7 +76,7 @@ private:
     OGLProgram shader;
 
     /// Display information for top and bottom screens respectively
-    std::array<ScreenInfo, 2> screen_infos;
+    std::array<ScreenInfo, 3> screen_infos;
 
     // Shader uniform location indices
     GLuint uniform_modelview_matrix;