在cocos2dx 中添加自定义 shaders --- 改变 HSL 色调,饱和度, 亮

步骤1

准备shaders文件-ccShad_Hsl.h

/*
 * cocos2d for iPhone: http://www.cocos2d-iphone.org
 *
 * Copyright (c) 2011 Brian Chapados
 * Permission is hereby granted,free of charge,to any person obtaining a copy
 * of this software and associated documentation files (the "Software"),to deal
 * in the Software without restriction,including without limitation the rights
 * to use,copy,modify,merge,publish,distribute,sublicense,and/or sell
 * copies of the Software,and to permit persons to whom the Software is
 * furnished to do so,subject to the following conditions:
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS",WITHOUT WARRANTY OF ANY KIND,EXPRESS OR
 * IMPLIED,INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,DAMAGES OR OTHER
 * LIABILITY,WHETHER IN AN ACTION OF CONTRACT,TORT OR OTHERWISE,ARISING FROM,0)"> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

" n
#ifdef GL_ES n
precision mediump float; n
#endif n
 n
varying vec2 v_texCoord; n
uniform sampler2D CC_Texture0; n
n
uniform float AddHue; n
uniform float AddSat; n
uniform float AddLig; n
uniform float AddRed; n
uniform float AddGreen; n
uniform float AddBlue; n
uniform float AddAlpha; n
float Hue_2_RGB(float v1,float v2,float vH ) n
{ n
 float ret;n
 if ( vH < 0.0 )n
 vH += 1.0;n
 if ( vH > 1.0 )n
 vH -= 1.0;n
 if ( ( 6.0 * vH ) < 1.0 )n
 ret = ( v1 + ( v2 - v1 ) * 6.0 * vH );n
 else if ( ( 2.0 * vH ) < 1.0 )n
 ret = ( v2 );n
 else if ( ( 3.0 * vH ) < 2.0 )n
 ret = ( v1 + ( v2 - v1 ) * ( ( 2.0 / 3.0 ) - vH ) * 6.0 );n
 elsen
 ret = v1;n
 return ret;n
}n
void main(void)n
{n
 float Cmax,Cmin;n
 float D;n
 float H,S,L;n
 float R,G,B;n
 vec4 color = texture2D(CC_Texture0,v_texCoord);n
 R = color.r;n
 G = color.g;n
 B = color.b;n
 Cmax = max (R,max (G,B));n
 Cmin = min (R,min (G,0)"> L = (Cmax + Cmin) / 2.0;n
 if (Cmax == Cmin)n
 {n
 H = 0.0;n
 S = 0.0;n
 }n
 D = Cmax - Cmin;n
 if (L < 0.5)n
 S = D / (Cmax + Cmin);n
 S = D / (2.0 - (Cmax + Cmin));n
 if (R == Cmax)n
 H = (G - B) / D;n
 } else {n
 if (G == Cmax)n
 H = 2.0 + (B - R) /D;n
 H = 4.0 + (R - G) / D;n
 H = H / 6.0;n
 // modify H/S/L valuesn
 H += AddHue;n
 S += AddSat;n
 L += AddLig;n
 if (H < 0.0)n
 H = H + 1.0;n
 H = clamp(H,0.0,1.0);n
 S = clamp(S,0)"> L = clamp(L,0)"> // convert back to RGBn
 float var_2,var_1;n
 if (S == 0.0)n
 R = L;n
 G = L;n
 B = L;n
 if ( L < 0.5 )n
 var_2 = L * ( 1.0 + S );n
 var_2 = ( L + S ) - ( S * L );n
 var_1 = 2.0 * L - var_2;n
 R = Hue_2_RGB( var_1,var_2,H + ( 1.0 / 3.0 ) );n
 G = Hue_2_RGB( var_1,H );n
 B = Hue_2_RGB( var_1,H - ( 1.0 / 3.0 ) );n
 R = R * AddRed;n
 G = G * AddGreen;n
 B = B * AddBlue;n
 gl_FragColor = vec4(R,B,color.a * AddAlpha);n
";

步骤2.

在ccShaders.h 中加入代码

extern CC_DLL const GLchar * ccPositionColorHSL_frag;
extern CC_DLL const GLchar * ccPositionColorHSL_vert;

在ccShaders.cpp 中加入代码

const GLchar * ccPositionColorHSL_frag =
#include "ccShad_Hsl.h"

在CCGLProgram.h 中定义

#define KCCShader_Position_hsl"KCCShader_Position_hsl"

在CCShaderCache.cpp 中 追加枚举kCCShaderType_Position_hsl,

在CCShaderCache.cpp 的reloadDefaultShaders中加入代码

p = programForKey(KCCShader_Position_hsl);
p->reset();
loadDefaultShader(p,kCCShaderType_Position_hsl);

在CCShaderCache.cpp 的loadDefaultShader中加入代码

case kCCShaderType_Position_hsl:
p->initWithVertexShaderByteArray(ccPositionTextureColor_vert,ccPositionColorHSL_frag);
p->addAttribute(kCCAttributeNamePosition,kCCVertexAttrib_Position);
p->addAttribute(kCCAttributeNameColor,kCCVertexAttrib_Color);
p->addAttribute(kCCAttributeNameTexCoord,kCCVertexAttrib_TexCoords);
break;

在CCShaderCache.cpp 的loadDefaultShaders中加入代码

p = new CCGLProgram();
loadDefaultShader(p,kCCShaderType_Position_hsl);

m_pPrograms->setObject(p,KCCShader_Position_hsl);
p->release();

步骤3.

在CCSprite 类中 追加 HSL 接口

 bool m_use_hsl;
 GLfloat m_color_h m_color_s m_color_l m_color_aGLuint hLocation sLocation lLocation rLocation gLocation bLocation aLocation;