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Use vogel disk sampling for the raytraced soft shadows and reduce the number of samples used for each quality mode

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Magnus Norddahl 2023-09-27 01:03:05 +02:00
commit d132a6842f
1 changed files with 17 additions and 33 deletions
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50
wadsrc/static/shaders/scene/light_shadow.glsl
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@ -167,37 +167,20 @@ bool traceHit(vec3 origin, vec3 direction, float dist)
#endif
vec2 softshadow[9 * 3] = vec2[](
vec2( 0.0, 0.0),
vec2(-2.0,-2.0),
vec2( 2.0, 2.0),
vec2( 2.0,-2.0),
vec2(-2.0, 2.0),
vec2(-1.0,-1.0),
vec2( 1.0, 1.0),
vec2( 1.0,-1.0),
vec2(-1.0, 1.0),
vec2( 0.0, 0.0),
vec2(-1.5,-1.5),
vec2( 1.5, 1.5),
vec2( 1.5,-1.5),
vec2(-1.5, 1.5),
vec2(-0.5,-0.5),
vec2( 0.5, 0.5),
vec2( 0.5,-0.5),
vec2(-0.5, 0.5),
vec2( 0.0, 0.0),
vec2(-1.25,-1.75),
vec2( 1.75, 1.25),
vec2( 1.25,-1.75),
vec2(-1.75, 1.75),
vec2(-0.75,-0.25),
vec2( 0.25, 0.75),
vec2( 0.75,-0.25),
vec2(-0.25, 0.75)
);
vec2 getVogelDiskSample(int sampleIndex, int sampleCount, float phi)
{
const float goldenAngle = radians(180.0) * (3.0 - sqrt(5.0));
float sampleIndexF = float(sampleIndex);
float sampleCountF = float(sampleCount);
float r = sqrt((sampleIndexF + 0.5) / sampleCountF); // Assuming index and count are positive
float theta = sampleIndexF * goldenAngle + phi;
float sine = sin(theta);
float cosine = cos(theta);
return vec2(cosine, sine) * r;
}
float traceShadow(vec4 lightpos, int quality)
{
@ -218,10 +201,11 @@ float traceShadow(vec4 lightpos, int quality)
vec3 ydir = cross(direction, xdir);
float sum = 0.0;
int step_count = quality * 9;
int step_count = quality * 4;
for (int i = 0; i <= step_count; i++)
{
vec3 pos = target + xdir * softshadow[i].x + ydir * softshadow[i].y;
vec2 gridoffset = getVogelDiskSample(i, step_count, gl_FragCoord.x + gl_FragCoord.y * 13.37);
vec3 pos = target + xdir * gridoffset.x + ydir * gridoffset.y;
sum += traceHit(origin, normalize(pos - origin), dist) ? 0.0 : 1.0;
}
return sum / step_count;