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Simplify sunlight shadow shader.

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This commit is contained in:
Vincent Lejeune 2014-12-09 19:00:21 +01:00
parent c91c04c862
commit cc7f95163c
1 changed files with 23 additions and 56 deletions
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79
data/shaders/sunlightshadow.frag
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@ -29,35 +29,27 @@ vec3 getMostRepresentativePoint(vec3 direction, vec3 R, float angularRadius)
return (DdotR < d) ? normalize(d * D + normalize (S) * r) : R; return (DdotR < d) ? normalize(d * D + normalize (S) * r) : R;
} }
float getShadowFactor(vec3 pos, float bias, int index) float getShadowFactor(vec3 pos, int index)
{ {
vec4 shadowcoord = (ShadowViewProjMatrixes[index] * InverseViewMatrix * vec4(pos, 1.0));
shadowcoord.xy /= shadowcoord.w;
vec2 shadowtexcoord = shadowcoord.xy * 0.5 + 0.5;
vec2 shadowoffset[4] = vec2[]( float z = texture(shadowtex, vec3(shadowtexcoord, float(index))).x;
vec2(-1., -1.), float d = shadowcoord.z;
vec2(-1., 1.), return min(pow(exp(-32. * d) * z, 8.), 1.);
vec2(1., -1.),
vec2(1., 1.)
);
vec4 shadowcoord = (ShadowViewProjMatrixes[index] * InverseViewMatrix * vec4(pos, 1.0));
shadowcoord.xy /= shadowcoord.w;
vec2 shadowtexcoord = shadowcoord.xy * 0.5 + 0.5;
float z = texture(shadowtex, vec3(shadowtexcoord, float(index))).x;
float d = shadowcoord.z;
return min(pow(exp(-32. * d) * z, 8.), 1.);
} }
void main() { void main() {
vec2 uv = gl_FragCoord.xy / screen; vec2 uv = gl_FragCoord.xy / screen;
float z = texture(dtex, uv).x; float z = texture(dtex, uv).x;
vec4 xpos = getPosFromUVDepth(vec3(uv, z), InverseProjectionMatrix); vec4 xpos = getPosFromUVDepth(vec3(uv, z), InverseProjectionMatrix);
vec3 norm = normalize(DecodeNormal(2. * texture(ntex, uv).xy - 1.)); vec3 norm = normalize(DecodeNormal(2. * texture(ntex, uv).xy - 1.));
float roughness =texture(ntex, uv).z; float roughness =texture(ntex, uv).z;
vec3 eyedir = -normalize(xpos.xyz); vec3 eyedir = -normalize(xpos.xyz);
// Normalized on the cpu // Normalized on the cpu
vec3 L = direction; vec3 L = direction;
float NdotL = clamp(dot(norm, L), 0., 1.); float NdotL = clamp(dot(norm, L), 0., 1.);
@ -69,43 +61,18 @@ void main() {
vec3 Specular = SpecularBRDF(norm, eyedir, Lightdir, col, roughness) * NdotL; vec3 Specular = SpecularBRDF(norm, eyedir, Lightdir, col, roughness) * NdotL;
vec3 outcol = NdotL * col; vec3 outcol = NdotL * col;
// Shadows // Shadows
float bias = 0.005 * tan(acos(NdotL)); // According to the slope int shadowtex_index = 0;
bias = clamp(bias, 0., 0.01); shadowtex_index += (xpos.z >= split0) ? 1 : 0;
float factor; shadowtex_index += (xpos.z >= split1) ? 1 : 0;
if (xpos.z < split0) shadowtex_index += (xpos.z >= split2) ? 1 : 0;
factor = getShadowFactor(xpos.xyz, bias, 0);
/* else if (xpos.z < 6.) float factor = getShadowFactor(xpos.xyz, shadowtex_index);
{ factor = (xpos.z > splitmax) ? 1. : factor;
float a = getShadowFactor(xpos.xyz, bias, 0), b = getShadowFactor(xpos.xyz, bias, 1);
factor = mix(a, b, (xpos.z - 5.)); Diff = vec4(factor * NdotL * col, 1.);
}*/ Spec = vec4(factor * Specular, 1.);
else if (xpos.z < split1)
factor = getShadowFactor(xpos.xyz, bias, 1);
/* else if (xpos.z < 21.)
{
float a = getShadowFactor(xpos.xyz, bias, 1), b = getShadowFactor(xpos.xyz, bias, 2);
factor = mix(a, b, (xpos.z - 20.));
}*/
else if (xpos.z < split2)
factor = getShadowFactor(xpos.xyz, bias, 2);
/* else if (xpos.z < 55.)
{
float a = getShadowFactor(xpos.xyz, bias, 2), b = getShadowFactor(xpos.xyz, bias, 3);
factor = mix(a, b, (xpos.z - 50.) / 5.);
}*/
else if (xpos.z < splitmax)
factor = getShadowFactor(xpos.xyz, bias, 3);
/* else if (xpos.z < 150.)
{
factor = mix(getShadowFactor(xpos.xyz, bias, 3), 1., (xpos.z - 145.) / 5.);
}*/
else
factor = 1.;
Diff = vec4(factor * NdotL * col, 1.);
Spec = vec4(factor * Specular, 1.);
return;
} }