support GL_ARB_texture_float

stepmania/src/ActorFrameTexture.cpp

@@ -11,6 +11,7 @@ ActorFrameTexture::ActorFrameTexture()
 {
 	m_bDepthBuffer = false;
 	m_bAlphaBuffer = false;
+	m_bFloat = false;
 	m_bPreserveTexture = false;
 	static uint64_t i = 0;
 	++i;
@@ -37,6 +38,7 @@ void ActorFrameTexture::Create()
 	RenderTargetParam param;
 	param.bWithDepthBuffer = m_bDepthBuffer;
 	param.bWithAlpha = m_bAlphaBuffer;
+	param.bFloat = m_bFloat;
 	param.iWidth = (int) m_size.x;
 	param.iHeight = (int) m_size.y;
 	m_pRenderTarget = new RageTextureRenderTarget( id, param );
@@ -67,6 +69,7 @@ public:
 	static int Create( T* p, lua_State *L )				{ p->Create(); return 0; }
 	static int EnableDepthBuffer( T* p, lua_State *L )		{ p->EnableDepthBuffer(BArg(1)); return 0; }
 	static int EnableAlphaBuffer( T* p, lua_State *L )		{ p->EnableAlphaBuffer(BArg(1)); return 0; }
+	static int EnableFloat( T* p, lua_State *L )			{ p->EnableFloat(BArg(1)); return 0; }
 	static int EnablePreserveTexture( T* p, lua_State *L )		{ p->EnablePreserveTexture(BArg(1)); return 0; }
 	static int SetTextureName( T* p, lua_State *L )			{ p->SetTextureName(SArg(1)); return 0; }
 	static int GetTexture( T* p, lua_State *L )
@@ -83,6 +86,7 @@ public:
 		ADD_METHOD( Create );
 		ADD_METHOD( EnableDepthBuffer );
 		ADD_METHOD( EnableAlphaBuffer );
+		ADD_METHOD( EnableFloat );
 		ADD_METHOD( EnablePreserveTexture );
 		ADD_METHOD( SetTextureName );
 		ADD_METHOD( GetTexture );

stepmania/src/ActorFrameTexture.h

@@ -22,6 +22,7 @@ public:
 
 	void EnableDepthBuffer( bool b ) { m_bDepthBuffer = b; }
 	void EnableAlphaBuffer( bool b ) { m_bAlphaBuffer = b; }
+	void EnableFloat( bool b ) { m_bFloat = b; }
 	void EnablePreserveTexture( bool b ) { m_bPreserveTexture = b; }
 
 	void Create();
@@ -38,6 +39,7 @@ private:
 
 	bool m_bDepthBuffer;
 	bool m_bAlphaBuffer;
+	bool m_bFloat;
 	bool m_bPreserveTexture;
 	RString m_sTextureName;
 };

stepmania/src/RageDisplay_OGL.cpp

@@ -2132,8 +2132,15 @@ void RenderTarget_FramebufferObject::Create( const RenderTargetParam &param, int
 	iTextureHeightOut = iTextureHeight;
 
 	glBindTexture( GL_TEXTURE_2D, m_iTexHandle );
-	glTexImage2D( GL_TEXTURE_2D, 0, param.bWithAlpha? GL_RGBA8:GL_RGB8,
-			iTextureWidth, iTextureHeight, 0, param.bWithAlpha? GL_RGBA:GL_RGB, GL_UNSIGNED_BYTE, NULL );
+	GLenum internalformat;
+	GLenum type = param.bWithAlpha? GL_RGBA:GL_RGB;
+	if( param.bFloat && GLExt.m_bGL_ARB_texture_float )
+		internalformat = param.bWithAlpha? GL_RGBA16F_ARB:GL_RGB16F_ARB;
+	else
+		internalformat = param.bWithAlpha? GL_RGBA8:GL_RGB8;
+	
+	glTexImage2D( GL_TEXTURE_2D, 0, internalformat,
+			iTextureWidth, iTextureHeight, 0, type, GL_UNSIGNED_BYTE, NULL );
 	AssertNoGLError();
 
 	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );

stepmania/src/RageDisplay_OGL_Helpers.cpp

@@ -106,6 +106,7 @@ void GLExt_t::Load( LowLevelWindow *pWind )
 	m_bARB_texture_env_combine = HasExtension("GL_ARB_texture_env_combine");
 	m_bEXT_texture_env_combine = HasExtension("GL_EXT_texture_env_combine");
 	m_bGL_EXT_bgra = HasExtension("GL_EXT_bgra");
+	m_bGL_ARB_texture_float = HasExtension("GL_ARB_texture_float");
 
 #if defined(WIN32)
 	if( HasExtension("WGL_EXT_swap_control") )

stepmania/src/RageDisplay_OGL_Helpers.h

@@ -65,6 +65,7 @@ struct GLExt_t
 	bool m_bARB_texture_env_combine;
 	bool m_bEXT_texture_env_combine;
 	bool m_bGL_EXT_bgra;
+	bool m_bGL_ARB_texture_float;
 
 	PWSWAPINTERVALEXTPROC wglSwapIntervalEXT;
 	PFNGLCOLORTABLEPROC glColorTableEXT;