SLUDGE: Add sludge files and make it compile

1 files changed, 60 insertions, 0 deletions

diff --git a/engines/sludge/scale.frag b/engines/sludge/scale.frag
new file mode 100644
index 0000000000..13558714ee
--- /dev/null
+++ b/engines/sludge/scale.frag
@@ -0,0 +1,60 @@
+/*
+   Inspired by a shader by guest(r) - guest.r@gmail.com - that was found at
+   http://www.razyboard.com/system/morethread-smart-texture-mag-filter-for-ogl2-and-dosbox-pete_bernert-266904-5689051-0.html
+*/
+
+uniform sampler2D Texture;
+uniform sampler2D lightTexture;
+uniform bool antialias;
+uniform bool useLightTexture;
+uniform float scale;
+
+varying vec2 varCoord0;
+varying vec2 varCoord1;
+
+varying vec4 color;
+varying vec4 secondaryColor;
+
+void main()
+{
+	vec4 c11 = texture2D(Texture, varCoord0.xy);
+
+	if (antialias) {
+		vec2 fw = fwidth(varCoord0.xy)*scale;
+
+		vec2 sd1 = vec2( fw.x,fw.y);
+		vec2 sd2 = vec2(-fw.x,fw.y);
+
+		vec4 s00 = texture2D(Texture, varCoord0.xy-sd1);
+		vec4 s20 = texture2D(Texture, varCoord0.xy-sd2);
+		vec4 s22 = texture2D(Texture, varCoord0.xy+sd1);
+		vec4 s02 = texture2D(Texture, varCoord0.xy+sd2);   
+
+		vec4 dt = vec4(1.0,1.0,1.0,1.0);
+		
+		float m1=dot(abs(s00-s22),dt)+0.0001;
+		float m2=dot(abs(s02-s20),dt)+0.0001;
+
+		vec4 temp1 = m2*(s00 + s22) + m1*(s02 + s20);
+
+	//	gl_FragColor = (temp1/(m1+m2)) * 0.5;
+		c11 = c11*0.333333 + (temp1/(m1+m2)) * 0.333333;
+	} 
+	/*
+	else {
+		gl_FragColor = c11;
+	}*/
+
+	//if (gl_FragColor.a<0.001) discard;
+	
+	vec3 col;
+	if (useLightTexture) {
+		vec4 texture1 = texture2D (lightTexture, varCoord1.xy);
+		col = texture1.rgb * c11.rgb;
+	} else {
+		col = color.rgb * c11.rgb;
+	}
+	col += vec3(secondaryColor);
+	gl_FragColor = vec4 (col, color.a * c11.a);
+}
+