/usr/share/sludge/scale.frag is in sludge-engine 2.1.2-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | /*
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 useLightTexture;
uniform float scale;
void main()
{
vec2 fw = fwidth(gl_TexCoord[0].xy)*scale;
vec2 sd1 = vec2( fw.x,fw.y);
vec2 sd2 = vec2(-fw.x,fw.y);
vec4 c11 = texture2D(Texture, gl_TexCoord[0].xy);
vec4 s00 = texture2D(Texture, gl_TexCoord[0].xy-sd1);
vec4 s20 = texture2D(Texture, gl_TexCoord[0].xy-sd2);
vec4 s22 = texture2D(Texture, gl_TexCoord[0].xy+sd1);
vec4 s02 = texture2D(Texture, gl_TexCoord[0].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;
gl_FragColor = c11*0.333333 + (temp1/(m1+m2)) * 0.333333;
if (gl_FragColor.a<0.001) discard;
vec3 col;
if (useLightTexture) {
vec4 texture1 = texture2D (lightTexture, gl_TexCoord[1].xy);
col = texture1.rgb * gl_FragColor.rgb;
} else {
col = gl_Color.rgb * gl_FragColor.rgb;
}
col += vec3(gl_SecondaryColor);
gl_FragColor = vec4 (col, gl_Color.a * gl_FragColor.a);
}
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