From 0edde43422301dad92e4e7fef3562d61f02cb0b2 Mon Sep 17 00:00:00 2001
From: rz5 <rz5@users.noreply.github.com>
Date: Wed, 28 Sep 2016 22:12:43 +0100
Subject: [PATCH] Update mudlord-emeraldenvy4.slang

---
 procedural/mudlord-emeraldenvy4.slang | 135 ++++++++++++++------------
 1 file changed, 72 insertions(+), 63 deletions(-)

diff --git a/procedural/mudlord-emeraldenvy4.slang b/procedural/mudlord-emeraldenvy4.slang
index 9920ab7..6b097aa 100644
--- a/procedural/mudlord-emeraldenvy4.slang
+++ b/procedural/mudlord-emeraldenvy4.slang
@@ -1,11 +1,11 @@
 #version 450
 layout(std140, set = 0, binding = 0) uniform UBO
 {
-   mat4 MVP;
-   vec4 OutputSize;
-   vec4 OriginalSize;
-   vec4 SourceSize;
-   uint FrameCount;
+	mat4 MVP;
+	vec4 OutputSize;
+	vec4 OriginalSize;
+	vec4 SourceSize;
+	uint FrameCount;
 } global;
 
 #pragma stage vertex
@@ -13,91 +13,100 @@ layout(location = 0) in vec4 Position;
 layout(location = 1) in  vec2 TexCoord;
 layout(location = 0) out vec2 vTexCoord;
 const vec2 madd = vec2(0.5, 0.5);
+
 void main()
 {
-   gl_Position = global.MVP * Position;
-   vTexCoord = gl_Position.xy;
+	gl_Position = global.MVP * Position;
+	vTexCoord   = gl_Position.xy;
 }
 
 #pragma stage fragment
 layout(location = 0) in vec2 vTexCoord;
 layout(location = 0) out vec4 FragColor;
 
-float time = float(global.FrameCount)*0.0325;
+float time      = float(global.FrameCount)*0.0325;
 vec2 resolution = global.OutputSize.xy;
-float fade = 0.45;
+float fade      = 0.45;
 
-const float PI=3.14159265358979323846;
+const float PI  = 3.14159265358979323846;
 
-float speed=time*0.25;
-float ground_x=0.125-0.25*cos(PI*speed*0.25);
-float ground_y=0.125+0.25*sin(PI*speed*0.25);
-float ground_z=speed*0.125;
+float speed     = time*0.25;
+float ground_x  = 0.125 - 0.25*cos(PI*speed*0.25);
+float ground_y  = 0.125 + 0.25*sin(PI*speed*0.25);
+float ground_z  = speed*0.125;
 
 vec2 rotate(vec2 k,float t)
-	{
-	return vec2(cos(t)*k.x-sin(t)*k.y,sin(t)*k.x+cos(t)*k.y);
-	}
-
+{
+	return vec2(cos(t)*k.x-sin(t)*k.y, sin(t)*k.x+cos(t)*k.y);
+}
 
 float scene(vec3 p)
-	{
-	float ball_p=0.25;
-	float ball_w=ball_p*1.0;
-	float ball=length(mod(p.xyz,ball_p)-ball_p*0.5)-ball_w;
-	float hole_w=ball_p*0.55;
-	float hole=length(mod(p.xyz,ball_p)-ball_p*0.5)-hole_w;
-	float pipe_p=0.015;
-	float pipe_w=pipe_p*0.42;//-0.00375*sync;
-	float pipe_y=length(max(abs(mod(p.xy,pipe_p)-pipe_p*0.5)-pipe_w,0.0));
-	float pipe_z=length(max(abs(mod(p.xz,pipe_p)-pipe_p*0.5)-pipe_w,0.0));
-	return max(max(ball,-hole),max(pipe_y,max(pipe_y,pipe_z)));
-	}
+{
+	float ball_p = 0.25;
+	float ball_w = ball_p*1.0;
+	float ball   = length(mod(p.xyz,ball_p)-ball_p*0.5)-ball_w;
+	float hole_w = ball_p*0.55;
+	float hole   = length(mod(p.xyz,ball_p)-ball_p*0.5)-hole_w;
+	float pipe_p = 0.015;
+	float pipe_w = pipe_p*0.42;//-0.00375*sync;
+	float pipe_y = length(max(abs(mod(p.xy,pipe_p)-pipe_p*0.5)-pipe_w,0.0));
+	float pipe_z = length(max(abs(mod(p.xz,pipe_p)-pipe_p*0.5)-pipe_w,0.0));
+
+	return max(max(ball,-hole),max(pipe_y,max(pipe_y,pipe_z)));
+}
+
+vec3 getNormal(vec3 pos) 
+{ 
+	vec3 e = vec3(0.0, 0.0001, 0.0); 
+
+	return normalize(vec3(scene(pos+e.yxx) - scene(pos-e.yxx),
+	                      scene(pos+e.xyx) - scene(pos-e.xyx),
+						  scene(pos+e.xxy) - scene(pos-e.xxy))); 
+}
 
- vec3 getNormal(vec3 pos) 
- { vec3 e = vec3(0.0,0.0001,0.0); 
- return normalize(vec3( scene(pos+e.yxx)-scene(pos-e.yxx),scene(pos+e.xyx)-scene(pos-e.xyx),scene(pos+e.xxy)-scene(pos-e.xxy) ) ); 
- } 
 float render_scene(vec3 ray_origin, vec3 ray_dir,float t)
 {
 	const int ray_n=96;
-	for(int i=0;i<ray_n;i++)
+	for(int i = 0; i<ray_n; i++)
 	{
-		
-		float k=scene(ray_origin+ray_dir*t);
-		t+=k*fade;
+		float k = scene(ray_origin+ray_dir*t);
+		t += k*fade;
 	}
 	return t;	
 }
 
-
 void main(void)
-	{
-    vec2 FragCoord = vTexCoord.xy*global.OutputSize.xy;
-    FragCoord.y = -FragCoord.y;
+{
+	vec2 FragCoord = vTexCoord.xy*global.OutputSize.xy;
+	FragCoord.y    = -FragCoord.y;
 
-	vec2 position=(FragCoord.xy/resolution.xy);
-	vec2 p=-1.0+2.0*position;
+	vec2 position = (FragCoord.xy/resolution.xy);
+	vec2 p        = -1.0+2.0*position;
+	
 	//set up camera
-	float speed=time*0.5;
-	vec3 dir=normalize(vec3(p*vec2(1.0,1.0),1.));
-	dir.yz=rotate(dir.yz,PI*1.0*sin(speed*0.25));		// rotation x
-	dir.zx=rotate(dir.zx,PI*1.0*cos(speed*0.25));		// rotation y
-	dir.xy=rotate(dir.xy,-speed*0.5);					// rotation z
-	vec3 ray=vec3(ground_x,ground_y,ground_z);
+	float speed = time*0.5;
+	vec3 dir = normalize(vec3(p*vec2(1.0,1.0),1.));
+	dir.yz = rotate(dir.yz,PI*1.0*sin(speed*0.25));		// rotation x
+	dir.zx = rotate(dir.zx,PI*1.0*cos(speed*0.25));		// rotation y
+	dir.xy = rotate(dir.xy,-speed*0.5);					// rotation z
+	vec3 ray = vec3(ground_x,ground_y,ground_z);
+	
 	//the raymarch
-	float t=0.0;
-	t=render_scene(ray,dir,t);
-	vec3 hit=ray+dir*t;
-	t+=hit.x;
+	float t  = 0.0;
+	t        = render_scene(ray,dir,t);
+	vec3 hit = ray + dir*t;
+	t       += hit.x;
+	
 	//get normal for reflection
-	vec3 n=getNormal(hit);
+	vec3 n = getNormal(hit);
+	
 	//render reflection
-	dir = reflect(dir,n);
-	dir = normalize(refract(dir,n,.82)); 	
-	t=render_scene(ray,dir,t);	
-	float c=(n.x*1.0+n.y+n.z)*0.5;	
-	vec3 color=vec3(0.,c*t*0.125*p.x+t*0.1,c*t*0.);
-	color *= 2.412;
-	FragColor=vec4(color,1.0);
-}
\ No newline at end of file
+	dir        = reflect(dir, n);
+	dir        = normalize(refract(dir, n, .82)); 	
+	t          = render_scene(ray, dir, t);	
+	float c    = (n.x*1.0 + n.y+n.z)*0.5;	
+	vec3 color = vec3(0., c*t*0.125*p.x + t*0.1, c*t*0.);
+	color     *= 2.412;
+	
+	FragColor = vec4(color, 1.0);
+}