Update Files

leenkx/Shaders/std/ssrs.glsl

@@ -0,0 +1,36 @@
+#ifndef _SSRS_GLSL_
+#define _SSRS_GLSL_
+
+#include "std/gbuffer.glsl"
+
+uniform mat4 VP;
+
+vec2 getProjectedCoord(vec3 hitCoord) {
+	vec4 projectedCoord = VP * vec4(hitCoord, 1.0);
+	projectedCoord.xy /= projectedCoord.w;
+	projectedCoord.xy = projectedCoord.xy * 0.5 + 0.5;
+	#if defined(HLSL) || defined(METAL)
+	projectedCoord.y = 1.0 - projectedCoord.y;
+	#endif
+	return projectedCoord.xy;
+}
+
+float getDeltaDepth(vec3 hitCoord, sampler2D gbufferD, mat4 invVP, vec3 eye) {
+	vec2 texCoord = getProjectedCoord(hitCoord);
+	float depth = textureLod(gbufferD, texCoord, 0.0).r * 2.0 - 1.0;
+	vec3 wpos = getPos2(invVP, depth, texCoord);
+	float d1 = length(eye - wpos);
+	float d2 = length(eye - hitCoord);
+	return d1 - d2;
+}
+
+float traceShadowSS(vec3 dir, vec3 hitCoord, sampler2D gbufferD, mat4 invVP, vec3 eye) {
+	dir *= ssrsRayStep;
+	for (int i = 0; i < 4; i++) {
+		hitCoord += dir;
+		if (getDeltaDepth(hitCoord, gbufferD, invVP, eye) > 0.0) return 1.0;
+	}
+	return 0.0;
+}
+
+#endif