Mitchell - Netravali cubic4 height ...

Mitchell - Netravali cubic4 height resizer, ebook

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// (C) 2011 Jan-Willem Krans (janwillem32 <at> hotmail.com)// This file is part of Video pixel shader pack.// This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.// This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.// You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.// Mitchell-Netravali cubic4 height resizer// This shader should be run as a screen space pixel shader if you are up-scaling.// This shader should not be run as a screen space pixel shader if you are down-scaling.// If possible, avoid compiling with the software emulation modes (ps_?_sw). Pixel shaders require a lot of processing power to run in real-time software mode.// This shader is meant to work with linear RGB input and output. Regular R'G'B' with a video gamma encoding will have to be converted with the linear gamma shaders to work properly.// Use this shader to scale the height of an image by Mitchell-Netravali cubic4 interpolation.// fractions, either decimal or not, are allowed// set the magnification factor#define Magnify (4/3.)sampler s0;float2 c0;float2 c1;#define sp(a, b) float4 a = tex2D(s0, float2(tex.x, coord+b*c1.y));float4 main(float2 tex : TEXCOORD0) : COLOR{float coord = (tex.y/Magnify+.5-.5/Magnify)*c0.y;// assign the output position, normalized to texture height in pixelsfloat t = frac(coord);// calculate the difference between the output pixel and the original surrounding two pixelscoord = (coord-t+.5)*c1.y;// adjust sampling matrix to put the ouput pixel in the interval [Q1, Q2)sp(Q0, -1) sp(Q1, 0) sp(Q2, 1) sp(Q3, 2)// original pixelsreturn (((((Q1-Q2)*21+(Q3-Q0)*7)*t+Q0*15+Q2*27-Q1*36-Q3*6)*t+(Q2-Q0)*9)*t+Q0+Q1*16+Q2)/18.;// interpolation output} [ Pobierz całość w formacie PDF ]

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