From cf8bb76a80bef80a76790898e12b85b18eb02353 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9F=D0=B5=D0=BB=D0=B8=D0=BF=D0=B5=D0=BD=D0=BA=D0=BE=20?=
 =?UTF-8?q?=D0=98=D0=B2=D0=B0=D0=BD?= <peri4ko@yandex.ru>
Date: Sun, 13 Dec 2015 21:45:21 +0000
Subject: [PATCH] git-svn-id: svn://db.shs.com.ru/libs@70
 a8b55f48-bf90-11e4-a774-851b48703e85

---
 qglview/shaders/ssao_blur.frag  | 47 +++++++++++++++++++++++++++++++++
 qglview/shaders/ssao_blur.vert  |  6 +++++
 qglview/shaders/ssao_merge.frag | 32 ++++++++++++++++++++++
 qglview/shaders/ssao_merge.vert | 10 +++++++
 4 files changed, 95 insertions(+)
 create mode 100644 qglview/shaders/ssao_blur.frag
 create mode 100644 qglview/shaders/ssao_blur.vert
 create mode 100644 qglview/shaders/ssao_merge.frag
 create mode 100644 qglview/shaders/ssao_merge.vert

diff --git a/qglview/shaders/ssao_blur.frag b/qglview/shaders/ssao_blur.frag
new file mode 100644
index 0000000..096e106
--- /dev/null
+++ b/qglview/shaders/ssao_blur.frag
@@ -0,0 +1,47 @@
+#version 150
+
+uniform sampler2D t0, ts, tg1;
+uniform float radius = 2;
+uniform vec2 dt;
+
+vec4 getTexel(vec2 tc, vec4 fp, vec4 fps) {
+	vec4 ct = max(texture(t0, tc), vec4(0)), st = max(texture(ts, tc), vec4(0));
+	ct = mix(ct, fp, step(1, abs(fps.w - ct.w)));
+	return ct;
+}
+
+void main(void) {
+	ivec2 itc = ivec2(gl_FragCoord.xy);
+	vec4 vg1 = texelFetch(tg1, itc, 0);
+	vec2 tc = qgl_FragTexture.xy;
+	float o = radius, o2 = radius * 2;
+	vec4 fps = max(texture(ts, tc), vec4(0));
+	vec4 fp = max(texture(t0, tc), vec4(0));
+	vec4 scol = (fp * 3. +
+				 getTexel(tc + dt * vec2(  o,  0 ), fp, fps) * 2. +
+				 getTexel(tc + dt * vec2(  0,  o ), fp, fps) * 2. +
+				 getTexel(tc + dt * vec2( -o, 0  ), fp, fps) * 2. +
+				 getTexel(tc + dt * vec2(  0,  -o), fp, fps) * 2. +
+				 getTexel(tc + dt * vec2(  o,  o ), fp, fps) * 1.5 +
+				 getTexel(tc + dt * vec2(  o,  -o), fp, fps) * 1.5 +
+				 getTexel(tc + dt * vec2( -o, -o ), fp, fps) * 1.5 +
+				 getTexel(tc + dt * vec2( -o, o  ), fp, fps) * 1.5 +
+				 getTexel(tc + dt * vec2( o2,  0 ), fp, fps) +
+				 getTexel(tc + dt * vec2(  0,  o2), fp, fps) +
+				 getTexel(tc + dt * vec2(-o2, 0  ), fp, fps) +
+				 getTexel(tc + dt * vec2(  0, -o2), fp, fps)) / 21.;
+	/*vec4 scol = fp;
+	scol = min(scol, getTexel(tc + dt * vec2(  o,  0 ), fp, fps));
+	scol = min(scol, getTexel(tc + dt * vec2(  0,  o ), fp, fps));
+	scol = min(scol, getTexel(tc + dt * vec2( -o, 0  ), fp, fps));
+	scol = min(scol, getTexel(tc + dt * vec2(  0,  -o), fp, fps));
+	scol = min(scol, getTexel(tc + dt * vec2(  o,  o ), fp, fps));
+	scol = min(scol, getTexel(tc + dt * vec2(  o,  -o), fp, fps));
+	scol = min(scol, getTexel(tc + dt * vec2( -o, -o ), fp, fps));
+	scol = min(scol, getTexel(tc + dt * vec2( -o, o  ), fp, fps));
+	scol = min(scol, getTexel(tc + dt * vec2( o2,  0 ), fp, fps));
+	scol = min(scol, getTexel(tc + dt * vec2(  0,  o2), fp, fps));
+	scol = min(scol, getTexel(tc + dt * vec2(-o2, 0  ), fp, fps));
+	scol = min(scol, getTexel(tc + dt * vec2(  0, -o2), fp, fps));*/
+	qgl_FragData[0].rgba = vec4(vg1.z);
+}
diff --git a/qglview/shaders/ssao_blur.vert b/qglview/shaders/ssao_blur.vert
new file mode 100644
index 0000000..6bc001e
--- /dev/null
+++ b/qglview/shaders/ssao_blur.vert
@@ -0,0 +1,6 @@
+#version 150
+
+void main(void) {
+	qgl_FragTexture = qgl_Texture;
+	gl_Position = qgl_ftransform();
+}
diff --git a/qglview/shaders/ssao_merge.frag b/qglview/shaders/ssao_merge.frag
new file mode 100644
index 0000000..b4d74dd
--- /dev/null
+++ b/qglview/shaders/ssao_merge.frag
@@ -0,0 +1,32 @@
+#version 150
+
+uniform sampler2D t0, ts, tg1;
+uniform float z_near, z_far;
+uniform mat4 mat_proj;
+
+in vec3 view_dir;
+
+void main(void) {
+	ivec2 tc = ivec2(gl_FragCoord.xy);
+	vec4 v0 = texelFetch(t0, tc, 0), vs = texelFetch(ts, tc, 0), vg1 = texelFetch(tg1, tc, 0);
+	vec3 n = vec3(-vg1.xy, vg1.z);
+	vec3 bn = cross(n, vec3(0, 0, 1));
+	vec3 bn2 = cross(n, bn);
+	vec4 pos;
+	pos.w = 1;
+	pos.xyz = view_dir * vs.w;
+	vec4 spos = pos, tpos, tv0;
+	vec2 tsp;
+	float l = 20 * 0.5;
+	pos.xyz += bn2 * l;
+	for (int i = 0; i < 16; ++i) {
+		tpos = mat_proj * pos;
+		tsp = -(tpos.xy / tpos.w) / 2. + 0.5;
+		tv0 = texture(ts, tsp);
+		l *= 0.5;
+		pos.xyz += bn2 * (step(pos.z, tv0.w) * 2. - 1.) * l;
+	}
+	qgl_FragData[0].rgb = vec3(1.-(vs.w - v0.w));
+	qgl_FragData[0].rgb = vec3(length(pos.z - spos.z)/15);
+	//qgl_FragData[0].rgb = vec3(abs(v0.w/1));
+}
diff --git a/qglview/shaders/ssao_merge.vert b/qglview/shaders/ssao_merge.vert
new file mode 100644
index 0000000..0e2d5fe
--- /dev/null
+++ b/qglview/shaders/ssao_merge.vert
@@ -0,0 +1,10 @@
+#version 150
+
+in vec3 view_corner;
+out vec3 view_dir;
+
+void main(void) {
+	view_dir = view_corner / view_corner.z;
+	qgl_FragTexture = qgl_Texture;
+	gl_Position = qgl_ftransform();
+}