Rewrite of OpenGL renderer, including OS X support

Screen contents are now displayed using textured quads. This can be updated to expose an FBO once an OpenGL backend for when Pica rendering is being worked on. That FBO's texture can then be applied to the quads.

Previously, FBO blitting was used in order to display screen contents, which did not work on OS X. The new textured quad approach is less of a compatibility risk.

1 files changed, 36 insertions, 27 deletions

diff --git a/src/video_core/renderer_opengl/renderer_opengl.h b/src/video_core/renderer_opengl/renderer_opengl.h
index 30f4febe..b21092f0 100644
--- a/src/video_core/renderer_opengl/renderer_opengl.h
+++ b/src/video_core/renderer_opengl/renderer_opengl.h
@@ -11,26 +11,25 @@
 
 #include "video_core/renderer_base.h"
 
+#include <array>
 
 class RendererOpenGL : virtual public RendererBase {
 public:
 
-    static const int kMaxFramebuffers = 2;  ///< Maximum number of framebuffers
-
     RendererOpenGL();
     ~RendererOpenGL();
 
     /// Swap buffers (render frame)
     void SwapBuffers();
 
-    /** 
+    /**
      * Renders external framebuffer (XFB)
      * @param src_rect Source rectangle in XFB to copy
      * @param dst_rect Destination rectangle in output framebuffer to copy to
      */
     void RenderXFB(const common::Rect& src_rect, const common::Rect& dst_rect);
 
-    /** 
+    /**
      * Set the emulator window to use for renderer
      * @param window EmuWindow handle to emulator window to use for rendering
      */
@@ -53,37 +52,47 @@ private:
     /// Updates the framerate
     void UpdateFramerate();
 
-    /**
-     * Helper function to flip framebuffer from left-to-right to top-to-bottom
-     * @param in Pointer to input raw framebuffer in V/RAM
-     * @param out Pointer to output buffer with flipped framebuffer
-     * @todo Early on hack... I'd like to find a more efficient way of doing this /bunnei
-     */
-    void FlipFramebuffer(const u8* in, u8* out);
+    /// Structure used for storing information for rendering each 3DS screen
+    struct ScreenInfo {
+        // Properties
+        int width;
+        int height;
+
+        // OpenGL object IDs
+        GLuint texture_id;
+        GLuint vertex_buffer_id;
 
+        // Temporary
+        u8* flipped_xfb_data;
+    };
 
-    EmuWindow*  m_render_window;                    ///< Handle to render window
-    u32         m_last_mode;                        ///< Last render mode
+    /**
+    * Helper function to flip framebuffer from left-to-right to top-to-bottom
+    * @param raw_data Pointer to input raw framebuffer in V/RAM
+    * @param screen_info ScreenInfo structure with screen size and output buffer pointer
+    * @todo Early on hack... I'd like to find a more efficient way of doing this /bunnei
+    */
+    void FlipFramebuffer(const u8* raw_data, ScreenInfo& screen_info);
 
-    int m_resolution_width;                         ///< Current resolution width
-    int m_resolution_height;                        ///< Current resolution height
+    EmuWindow*  render_window;                    ///< Handle to render window
+    u32         last_mode;                        ///< Last render mode
 
-    // Framebuffers
-    // ------------
+    int resolution_width;                         ///< Current resolution width
+    int resolution_height;                        ///< Current resolution height
 
-    GLuint m_fbo[kMaxFramebuffers];                 ///< Framebuffer objects
-    GLuint m_fbo_rbo[kMaxFramebuffers];             ///< Render buffer objects
-    GLuint m_fbo_depth_buffers[kMaxFramebuffers];   ///< Depth buffers objects
+    // OpenGL global object IDs
+    GLuint vertex_array_id;
+    GLuint program_id;
+    GLuint sampler_id;
 
-    GLuint m_xfb_texture_top;                       ///< GL handle to top framebuffer texture
-    GLuint m_xfb_texture_bottom;                    ///< GL handle to bottom framebuffer texture
-           
-    GLuint m_xfb_top;                               ///< GL handle to top framebuffer
-    GLuint m_xfb_bottom;                            ///< GL handle to bottom framebuffer
+    struct : std::array<ScreenInfo, 2> {
+        ScreenInfo& Top() { return (*this)[0]; }
+        ScreenInfo& Bottom() { return (*this)[1]; }
+    } screen_info;
 
     // "Flipped" framebuffers translate scanlines from native 3DS left-to-right to top-to-bottom
     // as OpenGL expects them in a texture. There probably is a more efficient way of doing this:
+    u8 xfb_top_flipped[VideoCore::kScreenTopWidth * VideoCore::kScreenTopHeight * 4];
+    u8 xfb_bottom_flipped[VideoCore::kScreenBottomWidth * VideoCore::kScreenBottomHeight * 4];
 
-    u8 m_xfb_top_flipped[VideoCore::kScreenTopWidth * VideoCore::kScreenTopHeight * 4];
-    u8 m_xfb_bottom_flipped[VideoCore::kScreenBottomWidth * VideoCore::kScreenBottomHeight * 4];
 };