36 lines
848 B
GLSL
36 lines
848 B
GLSL
|
#extension GL_ARB_texture_rectangle : enable
|
||
|
|
|
||
|
|
#define NUM_SAMPLES 4
|
||
|
|
|
||
|
|
uniform sampler2DRect osgOcean_Buffer;
|
||
|
|
uniform vec2 osgOcean_Direction;
|
||
|
|
uniform float osgOcean_Attenuation;
|
||
|
|
uniform float osgOcean_Pass;
|
||
|
|
|
||
|
|
void main(void)
|
||
|
|
{
|
||
|
|
vec2 sampleCoord = vec2(0.0);
|
||
|
|
vec3 cOut = vec3(0.0);
|
||
|
|
|
||
|
|
// sample weight = a^(b*s)
|
||
|
|
// a = attenuation
|
||
|
|
// b = 4^(pass-1)
|
||
|
|
// s = sample number
|
||
|
|
|
||
|
|
vec2 pxSize = vec2(0.5);
|
||
|
|
|
||
|
|
float b = pow( float(NUM_SAMPLES), float(osgOcean_Pass));
|
||
|
|
float sf = 0.0;
|
||
|
|
|
||
|
|
for (int s = 0; s < NUM_SAMPLES; s++)
|
||
|
|
{
|
||
|
|
sf = float(s);
|
||
|
|
float weight = pow(osgOcean_Attenuation, b * sf);
|
||
|
|
sampleCoord = gl_TexCoord[0].st + (osgOcean_Direction * b * vec2(sf) * pxSize);
|
||
|
|
cOut += clamp(weight,0.0,1.0) * texture2DRect(osgOcean_Buffer, sampleCoord).rgb;
|
||
|
|
}
|
||
|
|
|
||
|
|
vec3 streak = clamp(cOut, 0.0, 1.0);
|
||
|
|
|
||
|
|
gl_FragColor = vec4(streak,1.0);
|
||
|
|
}
|