changed default scaling behaviour when sharp_bilinear_simple shader i…

…s active. The picture will then be zoomed. Works great in Chaos Engine with line setting of just 210 or so. Perfectly sharp and large fills almost the whole screen without distortion.

src/gp2x/menu/menu_helper.cpp

@@ -146,19 +146,38 @@ void update_display() {
         black_screen_now();
         SDL_FreeSurface(prSDLScreen);
     }
+
     prSDLScreen = SDL_SetVideoMode(visibleAreaWidth, mainMenu_displayedLines, 16, SDL_HWSURFACE | SDL_DOUBLEBUF);
     printf("update_display: SDL_SetVideoMode(%i, %i, 16)\n", visibleAreaWidth, mainMenu_displayedLines);
-    //the commented out scaling fills the screen better
-    //but looks horrible, due to the current lack of a good shader sharp bilinear scaler
-    //so stick with simple 2* point filtering for now.
-    float sh = 544;
-    //float sh = (float) (2 * mainMenu_displayedLines);
-    float sw = ((float)visibleAreaWidth*((float)544/(float)mainMenu_displayedLines));
-    //float sw = (float) (2 * visibleAreaWidth);
-    int x = (960 - sw) / 2;
-    int y = (544 - sh) / 2;
-    SDL_SetVideoModeScalingBilinear(x, y, sw, sh);
-    printf("update_display: SDL_SetVideoModeScaling(%i, %i, %i, %i)\n", x, y, (int)sw, (int)sh);
+
+    float sh;
+    float sw;
+    int x;
+    int y;
+
+    //is the sharp_bilinear_simple shader active?
+    if (mainMenu_shader == 5) 
+    {
+    	sh = 544;
+      sw = ((float)visibleAreaWidth*((float)544/(float)mainMenu_displayedLines));
+    	x = (960 - sw) / 2;
+    	y = (544 - sh) / 2;
+
+    	//This requires SDL-Vita branch SDL12 for example 
+    	//https://github.com/rsn8887/SDL-Vita/tree/SDL12
+    	//to compile
+   	SDL_SetVideoModeScalingBilinear(x, y, sw, sh);
+    }
+    else //otherwise do regular integer 2* scaling to ensure good picture quality
+    {
+    	sh = (float) (2 * mainMenu_displayedLines);
+    	sw = (float) (2 * visibleAreaWidth);
+    	x = (960 - sw) / 2;
+      y = (544 - sh) / 2;
+      SDL_SetVideoModeScaling(x, y, sw, sh);
+	 }    
+	 printf("update_display: SDL_SetVideoModeScaling(%i, %i, %i, %i)\n", x, y, (int)sw, (int)sh);
+
     SDL_SetVideoModeSync(1);
 
     // set vita2d shader