git-svn-id: svn://db.shs.com.ru/libs@75 a8b55f48-bf90-11e4-a774-851b48703e85

qglview/shaders/ssr.frag

@@ -1,20 +1,26 @@
 #version 150
 
-uniform sampler2D t0, t1, ts, tbs;
+uniform sampler2D t0, t1, ts, td, tbs;
 uniform float z_near, z_far;
 uniform mat4 mat_proj;
 uniform vec3 cam_aim, cam_pos;
 
 in vec3 view_dir;
 
+const float _pe = 2.4e-7;
+
 void main(void) {
 	ivec2 tc = ivec2(gl_FragCoord.xy);
 	vec4 v0 = texelFetch(t0, tc, 0), v1 = texelFetch(t1, tc, 0), vs = texelFetch(ts, tc, 0);
 	vec3 sp = vec3(qgl_FragTexture.xy, v0.w);
 	vec2 tsp;
 	vec4 pos;
+	float z = texelFetch(td, tc, 0).r;
+	z = z + z - 1;
+	z = ((_pe - 2.) * z_near) / (z + _pe - 1.); // infinite depth
 	pos.w = 1;
-	pos.xyz = view_dir * v0.w;
+	pos.xyz = view_dir * z;
+	//pos.z = -pos.z;
 	vec4 spos = pos;
 	vec4 tpos;
 
@@ -22,9 +28,11 @@ void main(void) {
 	vec3 vd = -normalize(vec3(-view_dir.xy, view_dir.z));
 	vec3 rn = reflect(vd, n);
 	//rn.z += 1.;
-	float coeff = clamp(1. - (dot(vec3(0,0,1), n)), 0, 1), cz = v0.w;
+	float coeff = clamp(1. - (dot(vec3(0,0,1), n)), 0, 1);
 	coeff = coeff*coeff;
+	/*coeff = coeff*coeff;
 	coeff = coeff*coeff;
+	coeff = coeff*coeff;*/
 	float reflectivity = 0.;
 	float specularity = modf(v1.w, reflectivity);
 
@@ -33,12 +41,15 @@ void main(void) {
 	vec4 tv0;
 	float l = z_far * 0.5;
 	pos.xyz += rn * l;
-	for (i = 0; i < 20; ++i) {
+	float cz;
+	for (i = 0; i < 24; ++i) {
 		tpos = mat_proj * pos;
 		tsp = -(tpos.xy / tpos.w) / 2. + 0.5;
-		tv0 = texture(t0, tsp);
+		cz = texture(td, tsp).r;
+		cz = cz + cz - 1;
+		cz = ((_pe - 2.) * z_near) / (cz + _pe - 1.); // infinite depth
 		l *= 0.5;
-		pos.xyz += rn * (step(pos.z, tv0.w) * 2. - 1.) * l;
+		pos.xyz += rn * (step(pos.z, cz) * 2. - 1.) * l;
 	}
 
 	vec2 ess = abs(tsp - vec2(0.5, 0.5)) - vec2(0.3, 0.3);
@@ -52,4 +63,5 @@ void main(void) {
 	vec3 rvs = texture(ts, tsp).rgb;
 
 	qgl_FragData[0] = vec4(rvs.rgb, coeff / 1.1 + clamp(round(blur * 10), 0, 1000));
+	//qgl_FragData[0] = vec4(rvs.rgb, cz/5);
 }