Pete`s Messageboard Forum - OGL2 shaders - My WIP Shader - Maruke, please read!

Hi guys,

I came across Maruke's excellent CComic shader in this forum a while back and wanted to take it in more of a cel-shaded direction than the washed out comic book look in the original.

Maruke, I will not post the code here unless I have your permission to do so, since it was based on your initial code.

This is my first attempt at any GLSL coding, and will probably be the only thing I ever work on for Pete's OpenGL2 plugin.

EDIT: Maruke has approved my release of the shader, built upon his CComic shader as a base. Here's the code you'll need for your SLV and SLF files (note as this is a WIP, it's subject to change from time to time as I test different games and try to balance out color adjustment problems):

SLV:

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// Special thanks go out to Maruke for his CComic shader,
// and for allowing me to release this shader based upon his work.
// -----------
// MegaManJuno

uniform vec4 OGL2InvSize;

void main() {
vec4 offset;

gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;

gl_TexCoord[0] = gl_MultiTexCoord0.xyxy;

offset.xy = -(offset.zw = vec2(0.0, OGL2InvSize.y));
gl_TexCoord[1] = gl_TexCoord[0] + offset;

offset.xy = -(offset.zw = vec2(OGL2InvSize.x, 0.0));
gl_TexCoord[2] = gl_TexCoord[0] + offset;

offset.xy = -(offset.zw = vec2(OGL2InvSize.x, OGL2InvSize.y));
gl_TexCoord[3] = gl_TexCoord[1] + offset;
}

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// Special thanks go out to Maruke for his CComic shader,
// and for allowing me to release this shader based upon his work.
// -----------
// MegaManJuno

uniform sampler2D OGL2Texture;
uniform vec4 OGL2Param;

vec3 colorAdjust(in vec3 cRGB) {
float avg, m;

//average RGB values
avg = (max(cRGB[2], max(cRGB[0], cRGB[1])) + min(cRGB[2], min(cRGB[0], cRGB[1])) + ((cRGB[0] + cRGB[1] + cRGB[2]) / 3.0)) / 3.0;

m = (OGL2Param.z + 1.0) / 4.0;

if(avg >= 0.95) {
return(cRGB);
} else if(avg >= 0.8) {
return(cRGB + vec3((0.95 - avg) * m));

} else if(avg >= 0.75) {
return(cRGB - vec3((avg - 0.75) * m));
} else if(avg >= 0.6) {
return(cRGB + vec3((0.75 - avg) * m));

} else if(avg >= 0.5) {
return(cRGB - vec3((avg - 0.5) * m));
} else if(avg >= 0.4) {
return(cRGB + vec3((0.5 - avg) * m));

} else if(avg >= 0.25) {
return(cRGB - vec3((avg - 0.25) * m));
} else if(avg >= 0.2) {
return(cRGB + vec3((0.25 - avg) * m));

} else if(avg >= 0.05) {
return(cRGB - vec3((avg - 0.05) * m));
} else {
return(cRGB);
}
}

void main() {
vec3 h, o, c0, c1, c2, c3, c4, c5, c6, c7, c8, c9;
vec3 cz, cz0, cz1, cz2, cz3, cz5, cz6, cz7, cz8;
float i, k;

//brightness adjust before applying colorAdjust function
o = vec3(1.20); //20% brighter

c0 = (texture2D(OGL2Texture, gl_TexCoord[3].xy).rgb * o);
c1 = (texture2D(OGL2Texture, gl_TexCoord[2].xy).rgb * o);
c2 = (texture2D(OGL2Texture, gl_TexCoord[3].zy).rgb * o);
c3 = (texture2D(OGL2Texture, gl_TexCoord[1].xy).rgb * o);
c4 = (texture2D(OGL2Texture, gl_TexCoord[0].xy).rgb * o);
c5 = (texture2D(OGL2Texture, gl_TexCoord[1].zw).rgb * o);
c6 = (texture2D(OGL2Texture, gl_TexCoord[3].xw).rgb * o);
c7 = (texture2D(OGL2Texture, gl_TexCoord[2].zw).rgb * o);
c8 = (texture2D(OGL2Texture, gl_TexCoord[3].zw).rgb * o);

c9 = (c4 + ((c0 + c1 + c2 + c3 + c5 + c6 + c7 + c8) / 8.0)) / 2.0;

o = vec3(1.0);

h = vec3(0.003);
k = 0.001;

cz0 = (c0 + h) / (dot(o, c0) + k);
cz1 = (c1 + h) / (dot(o, c1) + k);
cz2 = (c2 + h) / (dot(o, c2) + k);
cz3 = (c3 + h) / (dot(o, c3) + k);
cz = (c9 + h) / (dot(o, c9) + k);
cz5 = (c5 + h) / (dot(o, c5) + k);
cz6 = (c6 + h) / (dot(o, c6) + k);
cz7 = (c7 + h) / (dot(o, c7) + k);
cz8 = (c8 + h) / (dot(o, c8) + k);

k = 0.01;

h = (cz - cz0); i = k / (dot(h, h) + k);
h = (cz - cz1); i += k / (dot(h, h) + k);
h = (cz - cz2); i += k / (dot(h, h) + k);
h = (cz - cz3); i += k / (dot(h, h) + k);
h = (cz - cz5); i += k / (dot(h, h) + k);
h = (cz - cz6); i += k / (dot(h, h) + k);
h = (cz - cz7); i += k / (dot(h, h) + k);
h = (cz - cz8); i += k / (dot(h, h) + k);

i /= 8.0;

c9 = min(o, min(c9, c9 + dot(o, c9))) * i;

gl_FragColor.rgb = (c9 + colorAdjust(c9)) / 2.0;
}

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My WIP Shader - Maruke, please read!

My WIP Shader - Maruke, please read!