basic temporal coherence for shadowHEADmaster

1 files changed, 13 insertions, 2 deletions

diff --git a/intermediate/ts.glsl b/intermediate/ts.glsl
index 23195f6..61dd728 100644
--- a/intermediate/ts.glsl
+++ b/intermediate/ts.glsl
@@ -138,11 +138,22 @@ vec3 get_world_pos(float depth, vec2 uv) {
 }
 
 void main() {
+	float w_prev = 0.9;
+	float w_cur = 0.1;
 	vec2 uv = interpolator.uv;
 	float d = texture(depthmap, uv).r;
 	vec3 wpos = get_world_pos(d, uv);
-	float prev = texture(previous, uv).r;
+	vec4 prev_pos = config.prev_vp * vec4(wpos, 1.0);
+	vec2 prev_uv = (prev_pos.xy / prev_pos.w) * 0.5 + 0.5;
+	float prev = texture(previous, prev_uv).r;
 	float current = get_shadow(caster_config.index, wpos);
-	shadow_amount = (prev + current) * 0.5;
+	if (
+		prev_uv.x < 0.0 || prev_uv.x > 1.0 || 
+		prev_uv.y < 0.0 || prev_uv.y > 1.0
+	) {
+		w_prev = 0.0;
+		w_cur = 1.0;
+	}
+	shadow_amount = (prev * w_prev + current * w_cur);
 }
 #endif