removed double buffered textures

These functions never ended up getting used, and have the potential to become
confusing in implementation.

app/render/backend/opengl/openglframebuffer.cpp

@@ -98,16 +98,6 @@ void OpenGLFramebuffer::Attach(OpenGLTexturePtr texture)
   AttachInternal(texture_->texture(), false);
 }
 
-void OpenGLFramebuffer::AttachBackBuffer(OpenGLTexturePtr texture)
-{
-  if (context_ == nullptr) {
-    return;
-  }
-
-  texture_ = texture;
-  AttachInternal(texture_->back_texture(), true);
-}
-
 void OpenGLFramebuffer::Detach()
 {
   if (context_ == nullptr) {

app/render/backend/opengl/openglframebuffer.h

@@ -45,8 +45,6 @@ public:
 
   void Attach(OpenGLTexturePtr texture);
 
-  void AttachBackBuffer(OpenGLTexturePtr texture);
-
   void Detach();
 
   const GLuint& buffer() const;

app/render/backend/opengl/opengltexture.cpp

@@ -28,7 +28,6 @@
 OpenGLTexture::OpenGLTexture() :
   context_(nullptr),
   texture_(0),
-  back_texture_(0),
   width_(0),
   height_(0),
   format_(olive::PIX_FMT_INVALID)
@@ -46,11 +45,6 @@ bool OpenGLTexture::IsCreated() const
 }
 
 void OpenGLTexture::Create(QOpenGLContext *ctx, int width, int height, const olive::PixelFormat &format, void* data)
-{
-  Create(ctx, width, height, format, kSingleBuffer, data);
-}
-
-void OpenGLTexture::Create(QOpenGLContext *ctx, int width, int height, const olive::PixelFormat &format, const OpenGLTexture::Type &type, void *data)
 {
   if (ctx == nullptr) {
     qWarning() << "RenderTexture::Create was passed an invalid context";
@@ -68,21 +62,11 @@ void OpenGLTexture::Create(QOpenGLContext *ctx, int width, int height, const oli
 
   // Create main texture
   CreateInternal(&texture_, data);
-
-  if (type == kDoubleBuffer) {
-    // Create back texture
-    CreateInternal(&back_texture_, nullptr);
-  }
-}
-
-void OpenGLTexture::Create(QOpenGLContext *ctx, FramePtr frame, const Type &type)
-{
-  Create(ctx, frame->width(), frame->height(), frame->format(), type, frame->data());
 }
 
 void OpenGLTexture::Create(QOpenGLContext *ctx, FramePtr frame)
 {
-  Create(ctx, frame, kSingleBuffer);
+  Create(ctx, frame->width(), frame->height(), frame->format(), frame->data());
 }
 
 void OpenGLTexture::Destroy()
@@ -93,9 +77,6 @@ void OpenGLTexture::Destroy()
     context_->functions()->glDeleteTextures(1, &texture_);
     texture_ = 0;
 
-    context_->functions()->glDeleteTextures(1, &back_texture_);
-    back_texture_ = 0;
-
     context_ = nullptr;
   }
 }
@@ -145,18 +126,6 @@ const GLuint &OpenGLTexture::texture() const
   return texture_;
 }
 
-const GLuint &OpenGLTexture::back_texture() const
-{
-  return back_texture_;
-}
-
-void OpenGLTexture::SwapFrontAndBack()
-{
-  GLuint temp = texture_;
-  texture_ = back_texture_;
-  back_texture_ = temp;
-}
-
 void OpenGLTexture::Upload(const void *data)
 {
   if (!IsCreated()) {

app/render/backend/opengl/opengltexture.h

@@ -35,19 +35,12 @@ class OpenGLTexture : public QObject
 {
   Q_OBJECT
 public:
-  enum Type {
-    kSingleBuffer,
-    kDoubleBuffer
-  };
-
   OpenGLTexture();
   virtual ~OpenGLTexture() override;
 
   DISABLE_COPY_MOVE(OpenGLTexture)
 
   void Create(QOpenGLContext* ctx, int width, int height, const olive::PixelFormat &format, void *data = nullptr);
-  void Create(QOpenGLContext* ctx, int width, int height, const olive::PixelFormat &format, const Type& type, void *data = nullptr);
-  void Create(QOpenGLContext* ctx, FramePtr frame, const Type& type);
   void Create(QOpenGLContext* ctx, FramePtr frame);
 
   bool IsCreated() const;
@@ -65,8 +58,6 @@ public:
   QOpenGLContext* context() const;
 
   const GLuint& texture() const;
-  const GLuint& back_texture() const;
-  void SwapFrontAndBack();
 
   void Upload(const void *data);
 
@@ -82,8 +73,6 @@ private:
 
   GLuint texture_;
 
-  GLuint back_texture_;
-
   int width_;
 
   int height_;