Cubic filtering mode, using a Catmull-Rom bicubic filter. Integer level, spatial linear interpolation. x and y are in base level coordinates (top-left pixel is on (0.5, 0.5) coordinates). Clamped to borders. Reference: https://registry.khronos.org/OpenGL/extensions/IMG/IMG_texture_filter_cubic.txt
See Implementation
Cubic filtering mode, using a Catmull-Rom bicubic filter. Integer level, spatial linear interpolation. x and y are in base level coordinates (top-left pixel is on (0.5, 0.5) coordinates). Clamped to borders. Reference: https://registry.khronos.org/OpenGL/extensions/IMG/IMG_texture_filter_cubic.txt