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- /* Weightp filter a downscaled image into a temporary output buffer.
- * This kernel is launched once for each scale.
- *
- * Launch dimensions: width x height (in pixels)
- */
- kernel void weightp_scaled_images( read_only image2d_t in_plane,
- write_only image2d_t out_plane,
- uint offset,
- uint scale,
- uint denom )
- {
- int gx = get_global_id( 0 );
- int gy = get_global_id( 1 );
- uint4 input_val;
- uint4 output_val;
- input_val = read_imageui( in_plane, sampler, (int2)(gx, gy));
- output_val = (uint4)(offset) + ( ( ((uint4)(scale)) * input_val ) >> ((uint4)(denom)) );
- write_imageui( out_plane, (int2)(gx, gy), output_val );
- }
- /* Weightp filter for the half-pel interpolated image
- *
- * Launch dimensions: width x height (in pixels)
- */
- kernel void weightp_hpel( read_only image2d_t in_plane,
- write_only image2d_t out_plane,
- uint offset,
- uint scale,
- uint denom )
- {
- int gx = get_global_id( 0 );
- int gy = get_global_id( 1 );
- uint input_val;
- uint output_val;
- input_val = read_imageui( in_plane, sampler, (int2)(gx, gy)).s0;
- //Unpack
- uint4 temp;
- temp.s0 = input_val & 0x00ff; temp.s1 = (input_val >> 8) & 0x00ff;
- temp.s2 = (input_val >> 16) & 0x00ff; temp.s3 = (input_val >> 24) & 0x00ff;
- temp = (uint4)(offset) + ( ( ((uint4)(scale)) * temp ) >> ((uint4)(denom)) );
- //Pack
- output_val = temp.s0 | (temp.s1 << 8) | (temp.s2 << 16) | (temp.s3 << 24);
- write_imageui( out_plane, (int2)(gx, gy), output_val );
- }
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