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#ifdef DESC
[program]
type: graphics
vertex: main
fragment: main
#endif
#include "forward.h"
#ifdef DESC
[binding]
name: verts
rate: vertex
[attribute]
name: position
type: vec2
[attribute]
name: uv
type: vec2
[interpolator]
name: uv
type: vec2
[texture]
name: shadowmaps
stage: fragment
dimension: shadowArray
[texture]
name: previous
stage: fragment
dimension: 2
[texture]
name: depthmap
stage: fragment
dimension: 2
[texture]
name: prev_occlusion
stage: fragment
dimension: 2
[struct]
name: Config
[variable]
name: inv_view
type: mat4
[variable]
name: inv_proj
type: mat4
[variable]
name: prev_vp
type: mat4
[struct]
name: Caster_Config
[variable]
name: index
type: int
[cbuffer]
name: config
type: Config
stage: fragment
[cbuffer]
name: caster_config
type: Caster_Config
stage: fragment
[sbuffer]
name: casters
type: Caster
stage: fragment
[target]
name: shadow_amount
type: float
[target]
name: occlusion
type: float
#endif
#ifdef VERTEX_SHADER
void main() {
interpolator.uv = uv;
gl_Position = vec4(position, 1.0, 1.0);
}
#endif
#ifdef FRAGMENT_SHADER
vec2 poissonDisk[16] = vec2[](
vec2(-0.94201624, -0.39906216),
vec2(0.94558609, -0.76890725),
vec2(-0.094184101, -0.92938870),
vec2(0.34495938, 0.29387760),
vec2(-0.91588581, 0.45771432),
vec2(-0.81544232, -0.87912464),
vec2(-0.38277543, 0.27676845),
vec2(0.97484398, 0.75648379),
vec2(0.44323325, -0.97511554),
vec2(0.53742981, -0.47373420),
vec2(-0.26496911, -0.41893023),
vec2(0.79197514, 0.19090188),
vec2(-0.24188840, 0.99706507),
vec2(-0.81409955, 0.91437590),
vec2(0.19984126, 0.78641367),
vec2(0.14383161, -0.14100790)
);
float random(vec3 seed, int i) {
vec4 seed4 = vec4(seed, i);
float dot_product = dot(seed4, vec4(12.9898,78.233,45.164,94.673));
return fract(sin(dot_product) * 43758.5453);
}
float get_shadow(int id, mat4 proj, vec3 wpos) {
const int taps = 4;
const float w = 1.0 / float(taps);
const float m = 1.0 / 1000.0;
int i;
float d = 0.0f;
vec4 surf = proj * vec4(wpos, 1.0);
surf /= surf.w;
surf.xy = surf.xy * 0.5 + 0.5;
surf.z -= 0.005;
for (i = 0; i < taps; i++) {
float r = random(floor(wpos.xyz * 1000.0), i + globals.frame);
int index = int(16.0 * r) % 16;
vec2 coord = surf.xy + poissonDisk[index] * m;
vec4 vec = vec4(coord, float(id), surf.z);
d += texture(shadowmaps, vec).r * w;
}
return d;
}
vec4 get_world_pos(float depth, vec2 uv) {
float z = depth;
vec4 clip = vec4(uv * 2.0 - 1.0, z, 1.0);
vec4 view = config.inv_proj * clip;
view /= view.w;
return config.inv_view * view;
}
void main() {
float w_prev = 0.99;
float w_cur = 0.01;
Caster caster = casters[caster_config.index];
vec2 uv = interpolator.uv;
float d = texture(depthmap, uv).r;
float o = texture(prev_occlusion, uv).r;
vec4 wpos = get_world_pos(d, uv);
vec4 prev_pos = config.prev_vp * vec4(wpos.xyz, 1.0);
vec2 prev_uv = (prev_pos.xy / prev_pos.w) * 0.5 + 0.5;
float prev = texture(previous, prev_uv).r;
float base = get_shadow(
caster_config.index,
caster.projection,
wpos.xyz
);
float jittered = get_shadow(
caster_config.index + max_casters,
caster.jittered,
wpos.xyz
);
if (
prev_uv.x < 0.0 || prev_uv.x > 1.0 ||
prev_uv.y < 0.0 || prev_uv.y > 1.0 ||
abs(d - o) > 0.001
) {
shadow_amount = base;
} else {
shadow_amount = prev * w_prev + jittered * w_cur;
}
occlusion = d;
}
#endif
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