mirror of
https://github.com/godotengine/godot.git
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322 lines
7.6 KiB
C++
322 lines
7.6 KiB
C++
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/*
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* Copyright 2015 The Etc2Comp Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "EtcConfig.h"
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#include "EtcColor.h"
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#include <math.h>
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namespace Etc
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{
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class ColorFloatRGBA
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{
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public:
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ColorFloatRGBA(void)
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{
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fR = fG = fB = fA = 0.0f;
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}
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ColorFloatRGBA(float a_fR, float a_fG, float a_fB, float a_fA)
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{
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fR = a_fR;
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fG = a_fG;
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fB = a_fB;
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fA = a_fA;
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}
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inline ColorFloatRGBA operator+(ColorFloatRGBA& a_rfrgba)
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{
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ColorFloatRGBA frgba;
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frgba.fR = fR + a_rfrgba.fR;
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frgba.fG = fG + a_rfrgba.fG;
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frgba.fB = fB + a_rfrgba.fB;
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frgba.fA = fA + a_rfrgba.fA;
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return frgba;
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}
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inline ColorFloatRGBA operator+(float a_f)
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{
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ColorFloatRGBA frgba;
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frgba.fR = fR + a_f;
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frgba.fG = fG + a_f;
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frgba.fB = fB + a_f;
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frgba.fA = fA;
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return frgba;
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}
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inline ColorFloatRGBA operator-(float a_f)
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{
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ColorFloatRGBA frgba;
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frgba.fR = fR - a_f;
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frgba.fG = fG - a_f;
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frgba.fB = fB - a_f;
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frgba.fA = fA;
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return frgba;
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}
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inline ColorFloatRGBA operator-(ColorFloatRGBA& a_rfrgba)
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{
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ColorFloatRGBA frgba;
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frgba.fR = fR - a_rfrgba.fR;
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frgba.fG = fG - a_rfrgba.fG;
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frgba.fB = fB - a_rfrgba.fB;
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frgba.fA = fA - a_rfrgba.fA;
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return frgba;
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}
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inline ColorFloatRGBA operator*(float a_f)
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{
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ColorFloatRGBA frgba;
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frgba.fR = fR * a_f;
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frgba.fG = fG * a_f;
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frgba.fB = fB * a_f;
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frgba.fA = fA;
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return frgba;
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}
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inline ColorFloatRGBA ScaleRGB(float a_f)
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{
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ColorFloatRGBA frgba;
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frgba.fR = a_f * fR;
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frgba.fG = a_f * fG;
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frgba.fB = a_f * fB;
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frgba.fA = fA;
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return frgba;
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}
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inline ColorFloatRGBA RoundRGB(void)
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{
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ColorFloatRGBA frgba;
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frgba.fR = roundf(fR);
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frgba.fG = roundf(fG);
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frgba.fB = roundf(fB);
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return frgba;
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}
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inline ColorFloatRGBA ToLinear()
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{
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ColorFloatRGBA frgbaLinear;
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frgbaLinear.fR = LogToLinear(fR);
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frgbaLinear.fG = LogToLinear(fG);
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frgbaLinear.fB = LogToLinear(fB);
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frgbaLinear.fA = fA;
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return frgbaLinear;
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}
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inline ColorFloatRGBA ToLog(void)
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{
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ColorFloatRGBA frgbaLog;
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frgbaLog.fR = LinearToLog(fR);
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frgbaLog.fG = LinearToLog(fG);
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frgbaLog.fB = LinearToLog(fB);
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frgbaLog.fA = fA;
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return frgbaLog;
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}
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inline static ColorFloatRGBA ConvertFromRGBA8(unsigned char a_ucR,
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unsigned char a_ucG, unsigned char a_ucB, unsigned char a_ucA)
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{
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ColorFloatRGBA frgba;
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frgba.fR = (float)a_ucR / 255.0f;
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frgba.fG = (float)a_ucG / 255.0f;
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frgba.fB = (float)a_ucB / 255.0f;
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frgba.fA = (float)a_ucA / 255.0f;
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return frgba;
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}
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inline static ColorFloatRGBA ConvertFromRGB4(unsigned char a_ucR4,
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unsigned char a_ucG4,
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unsigned char a_ucB4)
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{
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ColorFloatRGBA frgba;
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unsigned char ucR8 = (unsigned char)((a_ucR4 << 4) + a_ucR4);
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unsigned char ucG8 = (unsigned char)((a_ucG4 << 4) + a_ucG4);
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unsigned char ucB8 = (unsigned char)((a_ucB4 << 4) + a_ucB4);
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frgba.fR = (float)ucR8 / 255.0f;
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frgba.fG = (float)ucG8 / 255.0f;
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frgba.fB = (float)ucB8 / 255.0f;
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frgba.fA = 1.0f;
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return frgba;
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}
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inline static ColorFloatRGBA ConvertFromRGB5(unsigned char a_ucR5,
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unsigned char a_ucG5,
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unsigned char a_ucB5)
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{
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ColorFloatRGBA frgba;
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unsigned char ucR8 = (unsigned char)((a_ucR5 << 3) + (a_ucR5 >> 2));
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unsigned char ucG8 = (unsigned char)((a_ucG5 << 3) + (a_ucG5 >> 2));
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unsigned char ucB8 = (unsigned char)((a_ucB5 << 3) + (a_ucB5 >> 2));
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frgba.fR = (float)ucR8 / 255.0f;
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frgba.fG = (float)ucG8 / 255.0f;
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frgba.fB = (float)ucB8 / 255.0f;
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frgba.fA = 1.0f;
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return frgba;
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}
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inline static ColorFloatRGBA ConvertFromR6G7B6(unsigned char a_ucR6,
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unsigned char a_ucG7,
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unsigned char a_ucB6)
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{
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ColorFloatRGBA frgba;
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unsigned char ucR8 = (unsigned char)((a_ucR6 << 2) + (a_ucR6 >> 4));
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unsigned char ucG8 = (unsigned char)((a_ucG7 << 1) + (a_ucG7 >> 6));
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unsigned char ucB8 = (unsigned char)((a_ucB6 << 2) + (a_ucB6 >> 4));
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frgba.fR = (float)ucR8 / 255.0f;
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frgba.fG = (float)ucG8 / 255.0f;
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frgba.fB = (float)ucB8 / 255.0f;
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frgba.fA = 1.0f;
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return frgba;
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}
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// quantize to 4 bits, expand to 8 bits
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inline ColorFloatRGBA QuantizeR4G4B4(void) const
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{
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ColorFloatRGBA frgba = *this;
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// quantize to 4 bits
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frgba = frgba.ClampRGB().ScaleRGB(15.0f).RoundRGB();
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unsigned int uiR4 = (unsigned int)frgba.fR;
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unsigned int uiG4 = (unsigned int)frgba.fG;
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unsigned int uiB4 = (unsigned int)frgba.fB;
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// expand to 8 bits
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frgba.fR = (float) ((uiR4 << 4) + uiR4);
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frgba.fG = (float) ((uiG4 << 4) + uiG4);
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frgba.fB = (float) ((uiB4 << 4) + uiB4);
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frgba = frgba.ScaleRGB(1.0f/255.0f);
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return frgba;
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}
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// quantize to 5 bits, expand to 8 bits
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inline ColorFloatRGBA QuantizeR5G5B5(void) const
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{
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ColorFloatRGBA frgba = *this;
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// quantize to 5 bits
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frgba = frgba.ClampRGB().ScaleRGB(31.0f).RoundRGB();
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unsigned int uiR5 = (unsigned int)frgba.fR;
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unsigned int uiG5 = (unsigned int)frgba.fG;
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unsigned int uiB5 = (unsigned int)frgba.fB;
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// expand to 8 bits
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frgba.fR = (float)((uiR5 << 3) + (uiR5 >> 2));
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frgba.fG = (float)((uiG5 << 3) + (uiG5 >> 2));
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frgba.fB = (float)((uiB5 << 3) + (uiB5 >> 2));
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frgba = frgba.ScaleRGB(1.0f / 255.0f);
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return frgba;
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}
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// quantize to 6/7/6 bits, expand to 8 bits
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inline ColorFloatRGBA QuantizeR6G7B6(void) const
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{
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ColorFloatRGBA frgba = *this;
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// quantize to 6/7/6 bits
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ColorFloatRGBA frgba6 = frgba.ClampRGB().ScaleRGB(63.0f).RoundRGB();
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ColorFloatRGBA frgba7 = frgba.ClampRGB().ScaleRGB(127.0f).RoundRGB();
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unsigned int uiR6 = (unsigned int)frgba6.fR;
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unsigned int uiG7 = (unsigned int)frgba7.fG;
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unsigned int uiB6 = (unsigned int)frgba6.fB;
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// expand to 8 bits
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frgba.fR = (float)((uiR6 << 2) + (uiR6 >> 4));
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frgba.fG = (float)((uiG7 << 1) + (uiG7 >> 6));
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frgba.fB = (float)((uiB6 << 2) + (uiB6 >> 4));
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frgba = frgba.ScaleRGB(1.0f / 255.0f);
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return frgba;
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}
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inline ColorFloatRGBA ClampRGB(void)
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{
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ColorFloatRGBA frgba = *this;
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if (frgba.fR < 0.0f) { frgba.fR = 0.0f; }
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if (frgba.fR > 1.0f) { frgba.fR = 1.0f; }
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if (frgba.fG < 0.0f) { frgba.fG = 0.0f; }
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if (frgba.fG > 1.0f) { frgba.fG = 1.0f; }
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if (frgba.fB < 0.0f) { frgba.fB = 0.0f; }
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if (frgba.fB > 1.0f) { frgba.fB = 1.0f; }
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return frgba;
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}
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inline ColorFloatRGBA ClampRGBA(void)
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{
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ColorFloatRGBA frgba = *this;
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if (frgba.fR < 0.0f) { frgba.fR = 0.0f; }
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if (frgba.fR > 1.0f) { frgba.fR = 1.0f; }
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if (frgba.fG < 0.0f) { frgba.fG = 0.0f; }
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if (frgba.fG > 1.0f) { frgba.fG = 1.0f; }
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if (frgba.fB < 0.0f) { frgba.fB = 0.0f; }
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if (frgba.fB > 1.0f) { frgba.fB = 1.0f; }
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if (frgba.fA < 0.0f) { frgba.fA = 0.0f; }
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if (frgba.fA > 1.0f) { frgba.fA = 1.0f; }
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return frgba;
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}
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inline int IntRed(float a_fScale)
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{
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return (int)roundf(fR * a_fScale);
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}
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inline int IntGreen(float a_fScale)
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{
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return (int)roundf(fG * a_fScale);
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}
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inline int IntBlue(float a_fScale)
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{
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return (int)roundf(fB * a_fScale);
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}
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inline int IntAlpha(float a_fScale)
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{
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return (int)roundf(fA * a_fScale);
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}
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float fR, fG, fB, fA;
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};
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}
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