45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
$input v_pos, v_view, v_normal, v_color0
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/*
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* Copyright 2011-2016 Branimir Karadzic. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
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*/
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#include "../common/common.sh"
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vec2 blinn(vec3 _lightDir, vec3 _normal, vec3 _viewDir)
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{
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float ndotl = dot(_normal, _lightDir);
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vec3 reflected = _lightDir - 2.0*ndotl*_normal; // reflect(_lightDir, _normal);
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float rdotv = dot(reflected, _viewDir);
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return vec2(ndotl, rdotv);
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}
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float fresnel(float _ndotl, float _bias, float _pow)
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{
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float facing = (1.0 - _ndotl);
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return max(_bias + (1.0 - _bias) * pow(facing, _pow), 0.0);
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}
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vec4 lit(float _ndotl, float _rdotv, float _m)
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{
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float diff = max(0.0, _ndotl);
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float spec = step(0.0, _ndotl) * max(0.0, _rdotv * _m);
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return vec4(1.0, diff, spec, 1.0);
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}
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void main()
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{
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vec3 lightDir = vec3(0.0, 0.0, -1.0);
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vec3 normal = normalize(v_normal);
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vec3 view = normalize(v_view);
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vec2 bln = blinn(lightDir, normal, view);
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vec4 lc = lit(bln.x, bln.y, 1.0);
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float fres = fresnel(bln.x, 0.2, 5.0);
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vec3 color = v_color0.xyz;
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gl_FragColor.xyz = pow(vec3(0.07, 0.06, 0.08) + color*lc.y + fres*pow(lc.z, 128.0), vec3_splat(1.0/2.2) );
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gl_FragColor.w = 1.0;
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}
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