Add second gameboy shader

gameboy2.glslp

@@ -0,0 +1,33 @@
+shaders = "5"
+shader0 = "lcd3x.glsl"
+scale_type0 = "viewport"
+filter_linear0 = "false"
+
+shader1 = gb-pass-1.glsl
+shader2 = gb-pass-2.glsl
+shader3 = gb-pass-3.glsl
+shader4 = gb-pass-4.glsl
+
+scale_type1 = source
+scale1 = 1
+
+scale_type2 = source
+scale2 = 1
+
+scale_type3 = source
+scale3 = 1
+
+scale_type4 = source
+scale4 = 1
+
+filter_linear0 = false
+filter_linear1 = false
+filter_linear2 = false
+filter_linear3 = false
+filter_linear4 = false
+
+textures = COLOR_PALETTE;BACKGROUND
+COLOR_PALETTE = palette.png
+COLOR_PALETTE_linear = false
+BACKGROUND = background.png
+BACKGROUND_linear = true