[12091] | 1 | #version 100 |
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| 2 | |
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| 3 | precision mediump int; |
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| 4 | precision mediump float; |
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| 5 | |
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| 6 | varying vec2 oUv0; |
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| 7 | //varying vec2 uv1; |
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| 8 | |
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| 9 | uniform sampler2D RT; |
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| 10 | uniform sampler2D SplotchesTx; |
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| 11 | uniform sampler2D Texture2; |
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| 12 | uniform sampler2D SepiaTx; |
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| 13 | uniform float time_cycle_period; |
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| 14 | uniform float flicker; |
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| 15 | uniform float DirtFrequency; |
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| 16 | uniform vec3 luminance; |
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| 17 | uniform float frameJitter; |
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| 18 | uniform float lumiShift; |
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| 19 | |
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| 20 | vec2 calcSpriteAddr(vec2 texCoord, float DirtFrequency1, float period) |
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| 21 | { |
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| 22 | return texCoord + texture2D(Texture2, vec2(period * DirtFrequency1, 0.0)).xy; |
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| 23 | } |
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| 24 | |
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| 25 | vec4 getSplotches(vec2 spriteAddr) |
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| 26 | { |
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| 27 | // get sprite address into paged texture coords space |
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| 28 | spriteAddr = spriteAddr / 6.3; |
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| 29 | spriteAddr = spriteAddr - (spriteAddr / 33.3); |
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| 30 | |
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| 31 | return texture2D(SplotchesTx, spriteAddr); |
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| 32 | } |
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| 33 | |
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| 34 | void main() |
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| 35 | { |
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| 36 | // get sprite address |
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| 37 | vec2 spriteAddr = calcSpriteAddr(oUv0, DirtFrequency, time_cycle_period); |
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| 38 | |
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| 39 | // add some dark and light splotches to the film |
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| 40 | vec4 splotches = getSplotches(spriteAddr); |
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| 41 | vec4 specs = 1.0 - getSplotches(spriteAddr / 3.0); |
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| 42 | |
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| 43 | // convert color to base luminance |
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| 44 | vec4 base = texture2D(RT, oUv0 + vec2(0.0, spriteAddr.y * frameJitter)); |
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| 45 | float lumi = dot(base.rgb, luminance); |
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| 46 | // randomly shift luminance |
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| 47 | lumi -= spriteAddr.x * lumiShift; |
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| 48 | // tone map luminance |
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| 49 | base.rgb = texture2D(SepiaTx, vec2(lumi, 0.0)).rgb; |
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| 50 | |
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| 51 | // calc flicker speed |
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| 52 | float darken = fract(flicker * time_cycle_period); |
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| 53 | |
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| 54 | // we want darken to cycle between 0.6 and 1.0 |
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| 55 | darken = abs(darken - 0.5) * 0.4 + 0.6; |
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| 56 | // composite dirt onto film |
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| 57 | gl_FragColor = base * splotches * darken + specs; |
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| 58 | } |
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