public void SetCompositor( CompositorInstance compositor )
{
// Get some RTT dimensions for later calculations
foreach ( CompositionTechnique.TextureDefinition textureDefinition in compositor.Technique.TextureDefinitions )
{
if ( textureDefinition.Name == "rt_bloom0" )
{
bloomSize = (int)textureDefinition.Width; // should be square
// Calculate gaussian texture offsets & weights
float deviation = 3.0f;
float texelSize = 1.0f / (float)bloomSize;
// central sample, no offset
bloomTexOffsetsHorz[ 0 ] = 0.0f;
bloomTexOffsetsHorz[ 1 ] = 0.0f;
bloomTexOffsetsVert[ 0 ] = 0.0f;
bloomTexOffsetsVert[ 1 ] = 0.0f;
bloomTexWeights[ 0 ] = bloomTexWeights[ 1 ] = bloomTexWeights[ 2 ] = Utility.GaussianDistribution( 0, 0, deviation );
bloomTexWeights[ 3 ] = 1.0f;
// 'pre' samples
for ( int i = 1; i < 8; ++i )
{
int offset = i * 4;
bloomTexWeights[ offset + 0 ] = bloomTexWeights[ offset + 1 ] = bloomTexWeights[ offset + 2 ] = 1.25f * Utility.GaussianDistribution( i, 0, deviation );
bloomTexWeights[ offset + 3 ] = 1.0f;
bloomTexOffsetsHorz[ offset + 0 ] = i * texelSize;
bloomTexOffsetsHorz[ offset + 1 ] = 0.0f;
bloomTexOffsetsVert[ offset + 0 ] = 0.0f;
bloomTexOffsetsVert[ offset + 1 ] = i * texelSize;
}
// 'post' samples
for ( int i = 8; i < 15; ++i )
{
int offset = i * 4;
bloomTexWeights[ offset + 0 ] = bloomTexWeights[ offset + 1 ] =
bloomTexWeights[ offset + 2 ] = bloomTexWeights[ offset - 7 * 4 + 0 ];
bloomTexWeights[ offset + 3 ] = 1.0f;
bloomTexOffsetsHorz[ offset + 0 ] = -bloomTexOffsetsHorz[ offset - 7 * 4 + 0 ];
bloomTexOffsetsHorz[ offset + 1 ] = 0.0f;
bloomTexOffsetsVert[ offset + 0 ] = 0.0f;
bloomTexOffsetsVert[ offset + 1 ] = -bloomTexOffsetsVert[ offset - 7 * 4 + 1 ];
}
}
}
}
