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//
// Vertex shader for a particle fountain.
//
// Original Author: Philip Rideout
// Modified by: Mario Kleiner
//
// Derived from example code which is
// Copyright (c) 2002-2006 3Dlabs Inc. Ltd.
//
// See 3Dlabs-License.txt for license information
//
uniform float Time;
uniform float LifeTime;
uniform float Acceleration;
uniform vec3 StartPosition;
void main(void)
{
vec4 vertex = vec4(1.0);
vertex.xyz = StartPosition;
float t = max(Time - gl_Vertex.w, 0.0);
t = mod(t, LifeTime);
vec3 velocity = gl_Vertex.xyz;
vertex.xyz += velocity * t;
vertex.y -= Acceleration * t * t;
gl_FrontColor = vec4(gl_Color.rgb, 1.0 - (t / LifeTime));
gl_Position = gl_ModelViewProjectionMatrix * vertex;
}
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