52 lines
1.4 KiB
GLSL
52 lines
1.4 KiB
GLSL
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uniform vec4 osgOcean_ParticleColour;
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uniform float osgOcean_InversePeriod;
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uniform float osgOcean_ParticleSize;
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uniform float osg_SimulationTime;
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uniform float osg_DeltaSimulationTime;
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varying vec4 colour;
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varying vec2 texCoord;
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void main(void)
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{
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float startTime = gl_MultiTexCoord1.x;
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texCoord = gl_MultiTexCoord0.xy;
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float disp = (osg_SimulationTime - startTime)*osgOcean_InversePeriod;
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vec4 v_previous = gl_Vertex;
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vec3 direction = sign(gl_Normal);
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v_previous.x = direction.x * fract( disp + gl_Vertex.x );
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v_previous.y = direction.y * fract( disp + gl_Vertex.y );
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v_previous.z = direction.z * fract( disp + gl_Vertex.z );
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vec4 v_current = v_previous;
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v_current.x += ( osg_DeltaSimulationTime * osgOcean_InversePeriod );
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v_current.y += ( osg_DeltaSimulationTime * osgOcean_InversePeriod );
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v_current.z += ( osg_DeltaSimulationTime * osgOcean_InversePeriod );
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colour = osgOcean_ParticleColour;
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vec4 v1 = gl_ModelViewMatrix * v_current;
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vec4 v2 = gl_ModelViewMatrix * v_previous;
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vec3 dv = v2.xyz - v1.xyz;
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vec2 dv_normalized = normalize(dv.xy);
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dv.xy += dv_normalized * osgOcean_ParticleSize;
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vec2 dp = vec2( -dv_normalized.y, dv_normalized.x ) * osgOcean_ParticleSize;
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float area = length(dv.xy);
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colour.a = 0.05+(osgOcean_ParticleSize)/area;
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v1.xyz += dv*texCoord.y;
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v1.xy += dp*texCoord.x;
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gl_Position = gl_ProjectionMatrix * v1;
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gl_Position.z = 0.01;
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gl_ClipVertex = v1;
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}
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