protot/shaders/src/fs_sms_shadow.sh.orig

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/*
* Copyright 2013-2014 Dario Manesku. All rights reserved.
* License: http://www.opensource.org/licenses/BSD-2-Clause
*/
#include "../common/common.sh"
uniform vec4 u_lightPos;
uniform vec4 u_color;
#if SHADOW_PACKED_DEPTH
SAMPLER2D(u_shadowMap, 0);
# define Sampler sampler2D
#else
SAMPLER2DSHADOW(u_shadowMap, 0);
# define Sampler sampler2DShadow
#endif // SHADOW_PACKED_DEPTH
vec2 lit(vec3 _ld, vec3 _n, vec3 _vd, float _exp)
{
//diff
float ndotl = dot(_n, _ld);
//spec
vec3 r = 2.0*ndotl*_n - _ld; //reflect(_ld, _n);
float rdotv = dot(r, _vd);
float spec = step(0.0, ndotl) * pow(max(0.0, rdotv), _exp) * (2.0 + _exp)/8.0;
return max(vec2(ndotl, spec), 0.0);
}
float hardShadow(Sampler _sampler, vec4 _shadowCoord, float _bias)
{
vec3 texCoord = _shadowCoord.xyz/_shadowCoord.w;
#if SHADOW_PACKED_DEPTH
return step(texCoord.z-_bias, unpackRgbaToFloat(texture2D(_sampler, texCoord.xy) ) );
#else
return shadow2D(_sampler, vec3(texCoord.xy, texCoord.z-_bias) );
#endif // SHADOW_PACKED_DEPTH
}
float PCF(Sampler _sampler, vec4 _shadowCoord, float _bias, vec2 _texelSize)
{
vec2 texCoord = _shadowCoord.xy/_shadowCoord.w;
bool outside = any(greaterThan(texCoord, vec2_splat(1.0)))
|| any(lessThan (texCoord, vec2_splat(0.0)))
;
if (outside)
{
return 1.0;
}
float result = 0.0;
vec2 offset = _texelSize * _shadowCoord.w;
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(-1.5, -1.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(-1.5, -0.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(-1.5, 0.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(-1.5, 1.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(-0.5, -1.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(-0.5, -0.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(-0.5, 0.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(-0.5, 1.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(0.5, -1.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(0.5, -0.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(0.5, 0.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(0.5, 1.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(1.5, -1.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(1.5, -0.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(1.5, 0.5) * offset, 0.0, 0.0), _bias);
result += hardShadow(_sampler, _shadowCoord + vec4(vec2(1.5, 1.5) * offset, 0.0, 0.0), _bias);
return result / 16.0;
}
void main()
{
float shadowMapBias = 0.0001;
vec3 color = u_color.xyz;
vec3 v = v_view;
vec3 vd = -normalize(v);
vec3 n = v_normal;
vec3 l = u_lightPos.xyz;
vec3 ld = -normalize(l);
vec2 lc = lit(ld, n, vd, 1.0);
vec2 texelSize = vec2_splat(1.0/1024.0);
float visibility = PCF(u_shadowMap, v_shadowcoord, shadowMapBias, texelSize);
// float visibility = hardShadow(u_shadowMap, v_shadowcoord, shadowMapBias);
vec3 ambient = 0.1 * color;
vec3 brdf = (lc.x + lc.y) * color * visibility;
vec3 final = toGamma(abs(ambient + brdf) );
gl_FragColor = vec4(final, 1.0);
}