
//
// vertexnoise.vert: Vertex shader for warping the geometry with noise.
//
// author: Philip Rideout
//
// Copyright (c) 2005-2006: 3Dlabs, Inc.
//
//
// See 3Dlabs-License.txt for license information
//

uniform vec3 LightPosition;
uniform vec3 SurfaceColor;
uniform vec3 offset;
uniform float scaleIn;
uniform float scaleOut;
varying vec4 Color;

void main(void)
{
	vec3 normal = gl_Normal;
	vec3 vertex = gl_Vertex.xyz + noise3(offset + gl_Vertex.xyz * scaleIn) * scaleOut;

	normal = normalize(gl_NormalMatrix * normal);
	vec3 position = vec3(gl_ModelViewMatrix * vec4(vertex,1.0));
    vec3 lightVec   = normalize(LightPosition - position);
    float diffuse   = max(dot(lightVec, normal), 0.0);

    if (diffuse < 0.125)
         diffuse = 0.125;

    Color = vec4(SurfaceColor * diffuse, 1.0);
    gl_Position = gl_ModelViewProjectionMatrix * vec4(vertex,1.0);
}
