Implement smooth scaling

mkxp.conf

@@ -3,6 +3,7 @@ debugMode=true
 winResizable=true
 fullscreen=false
 fixedAspectRatio=false
+smoothScaling=false
 vsync=true
 defScreenW=640
 defScreenH=480

src/config.cpp

@@ -33,6 +33,7 @@ Config::Config()
       winResizable(false),
       fullscreen(false),
       fixedAspectRatio(false),
+      smoothScaling(false),
       vsync(false),
       defScreenW(640),
       defScreenH(480),
@@ -50,6 +51,7 @@ void Config::read()
 	READ_VAL(winResizable, Bool);
 	READ_VAL(fullscreen, Bool);
 	READ_VAL(fixedAspectRatio, Bool);
+	READ_VAL(smoothScaling, Bool);
 	READ_VAL(vsync, Bool);
 	READ_VAL(defScreenW, Int);
 	READ_VAL(defScreenH, Int);

src/config.h

@@ -34,6 +34,7 @@ struct Config
 	bool winResizable;
 	bool fullscreen;
 	bool fixedAspectRatio;
+	bool smoothScaling;
 	bool vsync;
 
 	int defScreenW;

src/gl-util.h

@@ -147,6 +147,12 @@ namespace FBO
 		Read = 1
 	};
 
+	enum BlitMode
+	{
+		Nearest = 0,
+		Linear  = 1
+	};
+
 	inline ID gen()
 	{
 		ID id;
@@ -189,18 +195,26 @@ namespace FBO
 	inline void blit(int srcX, int srcY,
 	                 int srcW, int srcH,
 	                 int dstX, int dstY,
-	                 int dstW, int dstH)
+	                 int dstW, int dstH,
+	                 BlitMode mode = Nearest)
 	{
+		static const GLenum modes[] =
+		{
+			GL_NEAREST,
+			GL_LINEAR
+		};
+
 		glBlitFramebufferEXT(srcX, srcY, srcX+srcW, srcY+srcH,
 		                     dstX, dstY, dstX+dstW, dstY+dstH,
-		                     GL_COLOR_BUFFER_BIT, GL_NEAREST);
+		                     GL_COLOR_BUFFER_BIT, modes[mode]);
 	}
 
 	inline void blit(int srcX, int srcY,
 					 int dstX, int dstY,
-					 int srcW, int srcH)
+					 int srcW, int srcH,
+	                 BlitMode mode = Nearest)
 	{
-		blit(srcX, srcY, srcW, srcH, dstX, dstY, srcW, srcH);
+		blit(srcX, srcY, srcW, srcH, dstX, dstY, srcW, srcH, mode);
 	}
 
 	inline Vec4 getPixel(int x, int y)

src/graphics.cpp

@@ -537,7 +537,7 @@ struct GraphicsPrivate
 	{
 		scSize = winSize;
 
-		if (!gState->config().fixedAspectRatio)
+		if (!threadData->config.fixedAspectRatio)
 		{
 			scOffset = Vec2i(0, 0);
 			return;
@@ -591,7 +591,8 @@ struct GraphicsPrivate
 	void blitBufferFlippedScaled()
 	{
 		FBO::blit(0, 0, scRes.x, scRes.y,
-		          scOffset.x, scSize.y+scOffset.y, scSize.x, -scSize.y);
+		          scOffset.x, scSize.y+scOffset.y, scSize.x, -scSize.y,
+		          threadData->config.smoothScaling ? FBO::Linear : FBO::Nearest);
 	}
 
 	/* Blits currently bound read FBO to screen (upside-down) */