79 lines
2.4 KiB
Python
79 lines
2.4 KiB
Python
$input v_view, v_bc, v_normal
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/*
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* Copyright 2016 Dario Manesku. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
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*/
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#include "../common/common.sh"
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#include "uniforms.sh"
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vec3 evalSh(vec3 _dir)
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{
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# define k01 0.2820947918 // sqrt( 1/PI)/2
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# define k02 0.4886025119 // sqrt( 3/PI)/2
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# define k03 1.0925484306 // sqrt(15/PI)/2
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# define k04 0.3153915652 // sqrt( 5/PI)/4
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# define k05 0.5462742153 // sqrt(15/PI)/4
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vec3 shEnv[9];
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shEnv[0] = vec3( 0.967757057878229854, 0.976516067990363390, 0.891218272348969998); /* Band 0 */
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shEnv[1] = vec3(-0.384163503608655643, -0.423492289131209787, -0.425532726148547868); /* Band 1 */
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shEnv[2] = vec3( 0.055906294587354334, 0.056627436881069373, 0.069969936396987467);
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shEnv[3] = vec3( 0.120985157386215209, 0.119297994074027414, 0.117111965829213599);
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shEnv[4] = vec3(-0.176711633774331106, -0.170331404095516392, -0.151345020570876621); /* Band 2 */
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shEnv[5] = vec3(-0.124682114349692147, -0.119340785411183953, -0.096300354204368860);
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shEnv[6] = vec3( 0.001852378550138503, -0.032592784164597745, -0.088204495001329680);
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shEnv[7] = vec3( 0.296365482782109446, 0.281268696656263029, 0.243328223888495510);
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shEnv[8] = vec3(-0.079826665303240341, -0.109340956251195970, -0.157208859664677764);
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vec3 nn = _dir.zxy;
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float sh[9];
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sh[0] = k01;
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sh[1] = -k02*nn.y;
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sh[2] = k02*nn.z;
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sh[3] = -k02*nn.x;
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sh[4] = k03*nn.y*nn.x;
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sh[5] = -k03*nn.y*nn.z;
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sh[6] = k04*(3.0*nn.z*nn.z-1.0);
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sh[7] = -k03*nn.x*nn.z;
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sh[8] = k05*(nn.x*nn.x-nn.y*nn.y);
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vec3 rgb = vec3_splat(0.0);
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rgb += shEnv[0] * sh[0] * 1.0;
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rgb += shEnv[1] * sh[1] * 2.0/2.5;
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rgb += shEnv[2] * sh[2] * 2.0/2.5;
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rgb += shEnv[3] * sh[3] * 2.0/2.5;
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rgb += shEnv[4] * sh[4] * 1.0/2.5;
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rgb += shEnv[5] * sh[5] * 0.5;
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rgb += shEnv[6] * sh[6] * 0.5;
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rgb += shEnv[7] * sh[7] * 0.5;
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rgb += shEnv[8] * sh[8] * 0.5;
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return rgb;
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}
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void main()
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{
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vec3 nn = normalize(v_normal);
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vec3 col = evalSh(nn);
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if (0.0 != u_drawEdges)
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{
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vec3 wfColor = u_wfColor;
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float wfOpacity = u_wfOpacity;
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float thickness = u_wfThickness;
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vec3 fw = abs(dFdx(v_bc)) + abs(dFdy(v_bc));
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vec3 val = smoothstep(vec3_splat(0.0), fw*thickness, v_bc);
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float edge = min(min(val.x, val.y), val.z); // Gets to 0.0 when close to edges.
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vec3 edgeCol = mix(col, wfColor, wfOpacity);
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col = mix(edgeCol, col, edge);
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}
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gl_FragColor.xyz = col;
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gl_FragColor.w = 1.0;
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}
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