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

步骤1.

准备 shaders文件- ccShad_Hsl.h

" \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\
\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\
else\n\
ret = v1;\n\
return ret;\n\
}\n\
\n\
void main(void)\n\
{\n\
float Cmax, Cmin;\n\
\n\
float D;\n\
\n\
float H, S, L;\n\
float R, G, B;\n\
\n\
vec4 color = texture2D(CC_Texture0, v_texCoord);\n\
\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, B));\n\
L = (Cmax + Cmin) / 2.0;\n\
\n\
if (Cmax == Cmin)\n\
{\n\
H = 0.0;\n\
S = 0.0;\n\
}\n\
else\n\
{\n\
D = Cmax - Cmin;\n\
if (L < 0.5)\n\
{\n\
S = D / (Cmax + Cmin);\n\
}\n\
else\n\
{\n\
S = D / (2.0 - (Cmax + Cmin));\n\
}\n\
\n\
if (R == Cmax)\n\
{\n\
H = (G - B) / D;\n\
} else {\n\
if (G == Cmax)\n\
{\n\
H = 2.0 + (B - R) /D;\n\
}\n\
else\n\
{\n\
H = 4.0 + (R - G) / D;\n\
}\n\
}\n\
H = H / 6.0;\n\
}\n\
\n\
// modify H/S/L values\n\
H += AddHue;\n\
S += AddSat;\n\
L += AddLig;\n\
\n\
if (H < 0.0)\n\
{\n\
H = H + 1.0;\n\
}\n\
\n\
H = clamp(H, 0.0, 1.0);\n\
S = clamp(S, 0.0, 1.0);\n\
L = clamp(L, 0.0, 1.0);\n\
\n\
// convert back to RGB\n\
float var_2, var_1;\n\
\n\
if (S == 0.0)\n\
{\n\
R = L;\n\
G = L;\n\
B = L;\n\
}\n\
else\n\
{\n\
if ( L < 0.5 )\n\
{\n\
var_2 = L * ( 1.0 + S );\n\
}\n\
else\n\
{\n\
var_2 = ( L + S ) - ( S * L );\n\
}\n\
\n\
var_1 = 2.0 * L - var_2;\n\
\n\
R = Hue_2_RGB( var_1, var_2, H + ( 1.0 / 3.0 ) );\n\
G = Hue_2_RGB( var_1, var_2, H );\n\
B = Hue_2_RGB( var_1, var_2, H - ( 1.0 / 3.0 ) );\n\
}\n\
\n\
R = R * AddRed;\n\
G = G * AddGreen;\n\
B = B * AddBlue;\n\
\n\
gl_FragColor = vec4(R,G,B, color.a * AddAlpha);\n\
\n\
}\n\
";

将它放入E:\HSluZiLong\cocos2d-x-2.2.1\cocos2d-x-2.2.1\cocos2dx\shaders 目录下

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();

if(this->m_use_hsl)
{
m_use_hsl = false;
initHSL();
}

步骤3.

在 CCSprite 类中 追加 HSL 接口

	bool m_use_hsl;
	GLfloat m_color_h;
	GLfloat m_color_s;
	GLfloat m_color_l;

GLfloat m_color_a;

GLuint hLocation;
GLuint sLocation;
GLuint lLocation;
GLuint rLocation;
GLuint gLocation;
GLuint bLocation;
GLuint aLocation;

	void initHSL();
	void drawHSL();
	void setHSL(float h, float s, float l);
	void setH(float h);
	void setS(float s);
	void setL(float l);
	float getH(void){ return m_color_h;}
	float getS(void){ return m_color_s;}
	float getL(void){ return m_color_l;}

void CCSprite::initHSL()
{
	if(m_use_hsl == false)
	{
		m_use_hsl = true;
		
		setShaderProgram(CCShaderCache::sharedShaderCache()->programForKey(KCCShader_Position_hsl));	
		hLocation = glGetUniformLocation( getShaderProgram()->getProgram(), "AddHue");
		sLocation = glGetUniformLocation( getShaderProgram()->getProgram(), "AddSat");
		lLocation = glGetUniformLocation( getShaderProgram()->getProgram(), "AddLig");
		rLocation = glGetUniformLocation( getShaderProgram()->getProgram(), "AddRed");
		gLocation = glGetUniformLocation( getShaderProgram()->getProgram(), "AddGreen");
		bLocation = glGetUniformLocation( getShaderProgram()->getProgram(), "AddBlue");
		aLocation = glGetUniformLocation( getShaderProgram()->getProgram(), "AddAlpha");
	}
}

void CCSprite::drawHSL()
{
    
    ccBlendFunc blend = getBlendFunc();
    ccGLBlendFunc(blend.src, blend.dst);

    getShaderProgram()->use();
    getShaderProgram()->setUniformsForBuiltins();
	getShaderProgram()->setUniformLocationWith1f(hLocation, m_color_h);
	getShaderProgram()->setUniformLocationWith1f(sLocation, m_color_s);
	getShaderProgram()->setUniformLocationWith1f(lLocation, m_color_l);
	getShaderProgram()->setUniformLocationWith1f(rLocation, _displayedColor.r/255.f);
	getShaderProgram()->setUniformLocationWith1f(gLocation, _displayedColor.g/255.f);
	getShaderProgram()->setUniformLocationWith1f(bLocation, _displayedColor.b/255.f);
	m_color_a = this->getOpacity() / 255.f;
	getShaderProgram()->setUniformLocationWith1f(aLocation, m_color_a);

    ccGLBindTexture2D( getTexture()->getName());
	ccGLEnableVertexAttribs(kCCVertexAttribFlag_PosColorTex );

#define kQuadSize sizeof(m_sQuad.bl)
    long offset = (long)&m_sQuad;

    // vertex
    int diff = offsetof( ccV3F_C4B_T2F, vertices);
    glVertexAttribPointer(kCCVertexAttrib_Position, 3, GL_FLOAT, GL_FALSE, kQuadSize, (void*) (offset + diff));

    // texCoods
    diff = offsetof( ccV3F_C4B_T2F, texCoords);
    glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, kQuadSize, (void*)(offset + diff));

    // color
    diff = offsetof( ccV3F_C4B_T2F, colors);
    glVertexAttribPointer(kCCVertexAttrib_Color, 4, GL_UNSIGNED_BYTE, GL_TRUE, kQuadSize, (void*)(offset + diff));


    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

    CC_INCREMENT_GL_DRAWS(1);	
}
void CCSprite::setHSL(float h, float s, float l)
{
	initHSL();
	setH(h);
	setS(s);
	setL(l);
}
void CCSprite::setH(float h)
{
	initHSL();
	m_color_h = h;
}
void CCSprite::setS(float s)
{
	initHSL();
	m_color_s = s;
}
void CCSprite::setL(float l)
{
	initHSL();
	m_color_l = l;
	ccBlendFunc blend = getBlendFunc();
	if(m_color_l > 0)
		blend.src = GL_SRC_ALPHA;
	else
		blend.src = GL_ONE;
	blend.dst = GL_ONE_MINUS_SRC_ALPHA;
	setBlendFunc(blend);
}

在 CCSprite.cpp 的 updateBlendFunc中追加代码

if(m_use_hsl)
{
ccBlendFunc blend = getBlendFunc();
if(m_color_l > 0)
blend.src = GL_SRC_ALPHA;
else
blend.src = GL_ONE;
blend.dst = GL_ONE_MINUS_SRC_ALPHA;
setBlendFunc(blend);
}

在 CCSprite.cpp 的 setTexture中追加代码

if(this->m_use_hsl)
{
m_use_hsl = false;
initHSL();
}

在 CCSprite.cpp 的 draw 开头插入代码

if(m_use_hsl)
{
drawHSL();
return;
}

步骤5.

调用接口

{
    CCSprite* pSprite = CCSprite::create("Icon.png");
	// -1 ~ 1  0无变化
	pSprite->setS(-1);
    // position the sprite on the center of the screen
    pSprite->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));

    // add the sprite as a child to this layer
    this->addChild(pSprite, 0);
	}