1 files changed, 66 insertions, 0 deletions

diff --git a/assets/shaders/Taper.vert.glsl b/assets/shaders/Taper.vert.glsl
new file mode 100644
index 00000000..82151f13
--- /dev/null
+++ b/assets/shaders/Taper.vert.glsl
@@ -0,0 +1,66 @@
+/* <copyright>
+This file contains proprietary software owned by Motorola Mobility, Inc.<br/>
+No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/>
+(c) Copyright 2011 Motorola Mobility, Inc.  All Rights Reserved.
+</copyright> */
+
+
+#ifdef GL_ES
+precision highp float;
+#endif
+
+
+// attributes
+attribute vec3 vert;
+attribute vec3 normal;
+attribute vec2 texcoord;
+
+// scalar uniforms
+uniform float u_limit1;
+uniform float u_limit2;
+uniform float u_limit3;
+uniform float u_taperAmount;
+uniform float u_center;
+
+uniform vec4 color;
+
+
+// matrix uniforms
+uniform mat4 u_mvMatrix;
+uniform mat4 u_projMatrix;
+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(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 - 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 - pos.y*TaperAmount(t)*u_taperAmount;
+                }
+        }
+
+        gl_Position = u_projMatrix * u_mvMatrix * vec4(pos,1.0) ;
+}
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