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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,172 @@ | ||
| // PUBLIC DOMAIN CRT STYLED SCAN-LINE SHADER | ||
| // | ||
| // by Timothy Lottes | ||
| // | ||
| // This is more along the style of a really good CGA arcade monitor. | ||
| // With RGB inputs instead of NTSC. | ||
| // The shadow mask example has the mask rotated 90 degrees for less chromatic aberration. | ||
| // | ||
| // Left it unoptimized to show the theory behind the algorithm. | ||
| // | ||
| // It is an example what I personally would want as a display option for pixel art games. | ||
| // Please take and use, change, or whatever | ||
|
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| varying vec4 v_color; | ||
| varying vec2 v_texCoord; | ||
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| uniform sampler2D tex0; | ||
|
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| // Hardness of scanline. | ||
| // -8.0 = soft | ||
| // -16.0 = medium | ||
| float hardScan=-8.0; | ||
|
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| // Hardness of pixels in scanline. | ||
| // -2.0 = soft | ||
| // -4.0 = hard | ||
| float hardPix=-2.0; | ||
|
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| // Display warp. | ||
| // 0.0 = none | ||
| // 1.0/8.0 = extreme | ||
| vec2 warp=vec2(1.0/32.0,1.0/24.0); | ||
|
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||
| // Amount of shadow mask. | ||
| float maskDark=1.0; | ||
| float maskLight=1.5; | ||
|
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| vec2 res = vec2(640.0,480.0); // /3.0 | ||
|
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| //------------------------------------------------------------------------ | ||
| // sRGB to Linear | ||
| // Assuming using sRGB typed textures this should not be needed. | ||
| float ToLinear1(float c){return(c<=0.04045)?c/12.92:pow((c+0.055)/1.055,2.4);} | ||
| vec3 ToLinear(vec3 c) | ||
| { | ||
| return vec3(ToLinear1(c.r),ToLinear1(c.g),ToLinear1(c.b)); | ||
| } | ||
|
|
||
| // Linear to sRGB | ||
| // Assuming using sRGB typed textures this should not be needed | ||
| float ToSrgb1(float c) | ||
| { | ||
| return(c<0.0031308?c*12.92:1.055*pow(c,0.41666)-0.055); | ||
| } | ||
|
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| vec3 ToSrgb(vec3 c) | ||
| { | ||
| return vec3(ToSrgb1(c.r),ToSrgb1(c.g),ToSrgb1(c.b)); | ||
| } | ||
|
|
||
| // Nearest emulated sample given floating point position and texel offset | ||
| // Also zeroes off screen | ||
| vec3 Fetch(vec2 pos,vec2 off) | ||
| { | ||
| pos=floor(pos*res+off)/res; | ||
| if(max(abs(pos.x-0.5),abs(pos.y-0.5))>0.5)return vec3(0.0,0.0,0.0); | ||
| return ToLinear(texture2D(tex0,pos.xy,-16.0).rgb); | ||
| } | ||
|
|
||
| // Distance in emulated pixels to nearest texel | ||
| vec2 Dist(vec2 pos) | ||
| { | ||
| pos=pos*res;return -((pos-floor(pos))-vec2(0.5)); | ||
| } | ||
|
|
||
| // 1D Gaussian | ||
| float Gaus(float pos,float scale) | ||
| { | ||
| return exp2(scale*pos*pos); | ||
| } | ||
|
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| // 3-tap Gaussian filter along horz line | ||
| vec3 Horz3(vec2 pos,float off) | ||
| { | ||
| vec3 b=Fetch(pos,vec2(-1.0,off)); | ||
| vec3 c=Fetch(pos,vec2( 0.0,off)); | ||
| vec3 d=Fetch(pos,vec2( 1.0,off)); | ||
| float dst=Dist(pos).x; | ||
| // Convert distance to weight | ||
| float scale=hardPix; | ||
| float wb=Gaus(dst-1.0,scale); | ||
| float wc=Gaus(dst+0.0,scale); | ||
| float wd=Gaus(dst+1.0,scale); | ||
| // Return filtered sample | ||
| return (b*wb+c*wc+d*wd)/(wb+wc+wd); | ||
| } | ||
|
|
||
| // 5-tap Gaussian filter along horz line | ||
| vec3 Horz5(vec2 pos,float off) | ||
| { | ||
| vec3 a=Fetch(pos,vec2(-2.0,off)); | ||
| vec3 b=Fetch(pos,vec2(-1.0,off)); | ||
| vec3 c=Fetch(pos,vec2( 0.0,off)); | ||
| vec3 d=Fetch(pos,vec2( 1.0,off)); | ||
| vec3 e=Fetch(pos,vec2( 2.0,off)); | ||
| float dst=Dist(pos).x; | ||
| // Convert distance to weight. | ||
| float scale=hardPix; | ||
| float wa=Gaus(dst-2.0,scale); | ||
| float wb=Gaus(dst-1.0,scale); | ||
| float wc=Gaus(dst+0.0,scale); | ||
| float wd=Gaus(dst+1.0,scale); | ||
| float we=Gaus(dst+2.0,scale); | ||
| // Return filtered sample. | ||
| return (a*wa+b*wb+c*wc+d*wd+e*we)/(wa+wb+wc+wd+we); | ||
| } | ||
|
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| // Return scanline weight | ||
| float Scan(vec2 pos,float off) | ||
| { | ||
| float dst=Dist(pos).y; | ||
| return Gaus(dst+off,hardScan); | ||
| } | ||
|
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||
| // Allow nearest three lines to effect pixel. | ||
| vec3 Tri(vec2 pos) | ||
| { | ||
| vec3 a=Horz3(pos,-1.0); | ||
| vec3 b=Horz5(pos, 0.0); | ||
| vec3 c=Horz3(pos, 1.0); | ||
| float wa=Scan(pos,-1.0); | ||
| float wb=Scan(pos, 0.0); | ||
| float wc=Scan(pos, 1.0); | ||
| return a*wa+b*wb+c*wc; | ||
| } | ||
|
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| // Distortion of scanlines, and end of screen alpha | ||
| vec2 Warp(vec2 pos) | ||
| { | ||
| pos=pos*2.0-1.0; | ||
| pos*=vec2(1.0+(pos.y*pos.y)*warp.x,1.0+(pos.x*pos.x)*warp.y); | ||
| return pos*0.5+0.5; | ||
| } | ||
|
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| // Shadow mask | ||
| vec3 Mask(vec2 pos) | ||
| { | ||
| pos.x+=pos.y*3.0; | ||
| vec3 mask=vec3(maskDark,maskDark,maskDark); | ||
| pos.x=fract(pos.x/6.0); | ||
| if(pos.x<0.333)mask.r=maskLight; | ||
| else if(pos.x<0.666)mask.g=maskLight; | ||
| else mask.b=maskLight; | ||
| return mask; | ||
| } | ||
|
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| // Draw dividing bars | ||
| float Bar(float pos,float bar) | ||
| { | ||
| pos-=bar;return pos*pos<4.0?0.0:1.0; | ||
| } | ||
|
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| // Entry | ||
| void main() | ||
| { | ||
| // Unmodified | ||
| vec2 pos=Warp(v_texCoord); | ||
| vec4 fragColor; | ||
| fragColor.rgb=Tri(pos)*Mask(gl_FragCoord.xy); | ||
| fragColor.rgb=ToSrgb(fragColor.rgb); | ||
| gl_FragColor=v_color * vec4(fragColor.rgb, 1.0); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| varying vec4 v_color; | ||
| varying vec2 v_texCoord; | ||
|
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| void main() | ||
| { | ||
| gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; | ||
| v_color = gl_Color; | ||
| v_texCoord = vec2(gl_MultiTexCoord0); | ||
| } |
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