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Diffstat (limited to '3rdparty/bgfx/examples/21-deferred/common.sh')
-rw-r--r-- | 3rdparty/bgfx/examples/21-deferred/common.sh | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/3rdparty/bgfx/examples/21-deferred/common.sh b/3rdparty/bgfx/examples/21-deferred/common.sh new file mode 100644 index 00000000000..fcb93f2c013 --- /dev/null +++ b/3rdparty/bgfx/examples/21-deferred/common.sh @@ -0,0 +1,62 @@ +/* + * Copyright 2011-2019 Branimir Karadzic. All rights reserved. + * License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause + */ + +#include "../common/common.sh" + +vec2 blinn(vec3 _lightDir, vec3 _normal, vec3 _viewDir) +{ + float ndotl = dot(_normal, _lightDir); + vec3 reflected = _lightDir - 2.0*ndotl*_normal; // reflect(_lightDir, _normal); + float rdotv = dot(reflected, _viewDir); + return vec2(ndotl, rdotv); +} + +float fresnel(float _ndotl, float _bias, float _pow) +{ + float facing = (1.0 - _ndotl); + return max(_bias + (1.0 - _bias) * pow(facing, _pow), 0.0); +} + +vec4 lit(float _ndotl, float _rdotv, float _m) +{ + float diff = max(0.0, _ndotl); + float spec = step(0.0, _ndotl) * max(0.0, _rdotv * _m); + return vec4(1.0, diff, spec, 1.0); +} + +vec4 powRgba(vec4 _rgba, float _pow) +{ + vec4 result; + result.xyz = pow(_rgba.xyz, vec3_splat(_pow) ); + result.w = _rgba.w; + return result; +} + +vec3 calcLight(vec3 _wpos, vec3 _normal, vec3 _view, vec3 _lightPos, float _lightRadius, vec3 _lightRgb, float _lightInner) +{ + vec3 lp = _lightPos - _wpos; + float attn = 1.0 - smoothstep(_lightInner, 1.0, length(lp) / _lightRadius); + vec3 lightDir = normalize(lp); + vec2 bln = blinn(lightDir, _normal, _view); + vec4 lc = lit(bln.x, bln.y, 1.0); + vec3 rgb = _lightRgb * saturate(lc.y) * attn; + return rgb; +} + +float toClipSpaceDepth(float _depthTextureZ) +{ +#if BGFX_SHADER_LANGUAGE_GLSL + return _depthTextureZ * 2.0 - 1.0; +#else + return _depthTextureZ; +#endif // BGFX_SHADER_LANGUAGE_GLSL +} + +vec3 clipToWorld(mat4 _invViewProj, vec3 _clipPos) +{ + vec4 wpos = mul(_invViewProj, vec4(_clipPos, 1.0) ); + return wpos.xyz / wpos.w; +} + |