SHADER_spinblurGPU "programs/spinblurGPU.frag" "Source" SHADER_spinblurGPU_ports "programs/spinblurGPU_ports.vert" SHADER_spinblurGPU_bbox "programs/spinblurGPU_bbox.vert" isotropic vec2 center point_ui Center float radius length 3 0 10000 float blur angle 1 0 180 radius_ui Radius radius center