From 2d4da18a778471b02e188ad668752e331ee76127 Mon Sep 17 00:00:00 2001
From: hwc487
Date: Tue, 7 Feb 2012 14:35:55 -0800
Subject: test code for deformation shader

---
 assets/shaders/Taper.vert.glsl | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

(limited to 'assets/shaders/Taper.vert.glsl')

diff --git a/assets/shaders/Taper.vert.glsl b/assets/shaders/Taper.vert.glsl
index 46f04fb3..82151f13 100644
--- a/assets/shaders/Taper.vert.glsl
+++ b/assets/shaders/Taper.vert.glsl
@@ -20,6 +20,7 @@ uniform float u_limit1;
 uniform float u_limit2;
 uniform float u_limit3;
 uniform float u_taperAmount;
+uniform float u_center;
 
 uniform vec4 color;
 
@@ -31,31 +32,35 @@ uniform mat4 u_worldMatrix;
 
 varying vec4 v_color;
 
+float TaperAmount( float param )
+{
+	float y0 = 1.0,  y1 = 1.0,  y2 = 0.0,  y3 = 0.0;
+	float yA0 = y0 + param*(y1 - y0),  yA1 = y1 + param*(y2 - y1),  yA2 = y2 + param*(y3 - y2);
+	float yB0 = yA0 + param*(yA1 - yA0),  yB1 = yA1 + param*(yA2 - yA1);
+	float yC0 = yB0 + param*(yB1 - yB0);
+
+	return yC0;
+}
 
 void main(void)
 {
 	vec3 pos = vert;
 	vec2 uv = texcoord;
 
-	v_color = vec4(0, 1, 0, 1);
+	v_color = vec4(texcoord.x, texcoord.y, 0, 1);
 	if (uv.x > u_limit1)
 	{
 		if (uv.x < u_limit2)
 		{
 			float t = (uv.x - u_limit1)/(u_limit2 - u_limit1);
-			pos.y = pos.y - t*u_taperAmount;
-			v_color = vec4( 1, 1, 0, 1 );
+			pos.y = pos.y - pos.y*TaperAmount(t)*u_taperAmount;
 		}
 		else if (uv.x < u_limit3)
 		{
 			float t = 1.0 - (uv.x - u_limit2)/(u_limit3 - u_limit2);
-			pos.y = pos.y - t*u_taperAmount;
-			v_color = vec4( 0, 1, 1, 1 );
+			pos.y = pos.y - pos.y*TaperAmount(t)*u_taperAmount;
 		}
-		else
-			v_color = vec4(0,0,1,1);
 	}
 
-
 	gl_Position = u_projMatrix * u_mvMatrix * vec4(pos,1.0) ;
 }
\ No newline at end of file
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