mirror of
https://github.com/scratchfoundation/bgfx.git
synced 2024-11-25 17:18:12 -05:00
79 lines
3.1 KiB
Text
79 lines
3.1 KiB
Text
#version 300 es
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#define gl_FragData _glesFragData
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layout(location = 0) out mediump vec4 _glesFragData[4];
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float xll_saturate_f( float x) {
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return clamp( x, 0.0, 1.0);
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}
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struct v2f_ao {
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highp vec4 pos;
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highp vec2 uv;
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highp vec2 uvr;
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};
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uniform highp vec4 _ProjectionParams;
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uniform highp vec2 _NoiseScale;
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uniform highp vec4 _CameraDepthNormalsTexture_ST;
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uniform sampler2D _CameraDepthNormalsTexture;
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uniform sampler2D _RandomTexture;
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uniform highp vec4 _Params;
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highp float DecodeFloatRG( in highp vec2 enc ) {
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highp vec2 kDecodeDot = vec2( 1.0, 0.00392157);
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return dot( enc, kDecodeDot);
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}
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highp vec3 DecodeViewNormalStereo( in highp vec4 enc4 ) {
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highp float kScale = 1.7777;
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highp vec3 nn = ((enc4.xyz * vec3( (2.0 * kScale), (2.0 * kScale), 0.0)) + vec3( (-kScale), (-kScale), 1.0));
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highp float g = (2.0 / dot( nn.xyz, nn.xyz));
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highp vec3 n;
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n.xy = (g * nn.xy);
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n.z = (g - 1.0);
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return n;
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}
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void DecodeDepthNormal( in highp vec4 enc, out highp float depth, out highp vec3 normal ) {
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depth = DecodeFloatRG( enc.zw);
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normal = DecodeViewNormalStereo( enc);
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}
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mediump float frag_ao( in v2f_ao i, in highp int sampleCount, in highp vec3 samples[8] ) {
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mediump vec3 randN = ((texture( _RandomTexture, i.uvr).xyz * 2.0) - 1.0);
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highp vec4 depthnormal = texture( _CameraDepthNormalsTexture, i.uv);
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highp vec3 viewNorm;
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highp float depth;
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DecodeDepthNormal( depthnormal, depth, viewNorm);
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depth *= _ProjectionParams.z;
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highp float scale = (_Params.x / depth);
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highp float occ = 0.0;
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highp int s = 0;
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for ( ; (s < sampleCount); (++s)) {
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mediump vec3 randomDir = reflect( samples[s], randN);
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mediump float flip = (( (dot( viewNorm, randomDir) < 0.0) ) ? ( 1.0 ) : ( -1.0 ));
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randomDir *= (-flip);
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randomDir += (viewNorm * 0.3);
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highp vec2 offset = (randomDir.xy * scale);
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highp float sD = (depth - (randomDir.z * _Params.x));
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highp vec4 sampleND = texture( _CameraDepthNormalsTexture, (i.uv + offset));
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highp float sampleD;
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highp vec3 sampleN;
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DecodeDepthNormal( sampleND, sampleD, sampleN);
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sampleD *= _ProjectionParams.z;
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highp float zd = xll_saturate_f((sD - sampleD));
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if ((zd > _Params.y)){
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occ += pow( (1.0 - zd), _Params.z);
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}
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}
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occ /= float(sampleCount);
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return (1.0 - occ);
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}
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mediump vec4 frag( in v2f_ao i ) {
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const highp vec3[8] RAND_SAMPLES = vec3[8]( vec3( 0.0130572, 0.587232, -0.119337), vec3( 0.323078, 0.0220727, -0.418873), vec3( -0.310725, -0.191367, 0.0561369), vec3( -0.479646, 0.0939877, -0.580265), vec3( 0.139999, -0.33577, 0.559679), vec3( -0.248458, 0.255532, 0.348944), vec3( 0.18719, -0.702764, -0.231748), vec3( 0.884915, 0.284208, 0.368524));
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return vec4( frag_ao( i, 8, RAND_SAMPLES));
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}
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in highp vec2 xlv_TEXCOORD0;
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in highp vec2 xlv_TEXCOORD1;
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void main() {
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mediump vec4 xl_retval;
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v2f_ao xlt_i;
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xlt_i.pos = vec4(0.0);
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xlt_i.uv = vec2(xlv_TEXCOORD0);
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xlt_i.uvr = vec2(xlv_TEXCOORD1);
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xl_retval = frag( xlt_i);
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gl_FragData[0] = vec4(xl_retval);
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}
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