cocos2dx 修改亮度、对比度、色调、饱和度

佚名 6年前 (2019-04-11) 随笔 1064人围观抢沙发百度已收录

废话少说，直接修改CCSprite使用的片面着色器ccShader_PositionTextureColor_noMVP.frag：

/*
 * cocos2d for iPhone: http://www.cocos2d-iphone.org
 *
 * Copyright (c) 2011 Ricardo Quesada
 * Copyright (c) 2012 Zynga Inc.
 *
 * 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,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

const char* ccPositionTextureColor_noMVP_frag = R"(
#ifdef GL_ES
precision lowp float;
#endif

varying vec4 v_fragmentColor;
varying vec2 v_texCoord;

uniform float u_hue;
uniform float u_saturation;
uniform float u_brightness;
uniform float u_contrast;

vec3 rgbtohsv(vec3 rgb)
{
    float R = rgb.x;
    float G = rgb.y;
    float B = rgb.z;
    vec3 hsv;
    float max1 = max(R, max(G, B));
    float min1 = min(R, min(G, B));
    if (R == max1)
    {
        hsv.x = (G - B) / (max1 - min1);
    }
    if (G == max1)
    {
        hsv.x = 2.0 + (B - R) / (max1 - min1);
    }
    if (B == max1)
    {
        hsv.x = 4.0 + (R - G) / (max1 - min1);
    }
    hsv.x = hsv.x * 60.0;
    if (hsv.x  < 0.0)
    {
        hsv.x = hsv.x + 360.0;
    }
    hsv.z = max1;
    hsv.y = (max1 - min1) / max1;
    return hsv;
}
vec3 hsvtorgb(vec3 hsv)
{
    float R;
    float G;
    float B;
    if (hsv.y == 0.0)
    {
        R = G = B = hsv.z;
    }
    else
    {
        hsv.x = hsv.x / 60.0;
        int i = int(hsv.x);
        float f = hsv.x - float(i);
        float a = hsv.z * (1.0 - hsv.y);
        float b = hsv.z * (1.0 - hsv.y * f);
        float c = hsv.z * (1.0 - hsv.y * (1.0 - f));
        if (i == 0)
        {
            R = hsv.z;
            G = c;
            B = a;
        }
        else if (i == 1)
        {
            R = b;
            G = hsv.z;
            B = a;
        }
        else if (i == 2)
        {
            R = a;
            G = hsv.z;
            B = c;
        }
        else if (i == 3)
        {
            R = a;
            G = b;
            B = hsv.z;
        }
        else if (i == 4)
        {
            R = c;
            G = a;
            B = hsv.z;
        }
        else
        {
            R = hsv.z;
            G = a;
            B = b;
        }
    }
    return vec3(R, G, B);
}

void main()
{
    vec4 pixColor = texture2D(CC_Texture0, v_texCoord);
    vec3 hsv;
    hsv.xyz = rgbtohsv(pixColor.xyz);
    hsv.x += u_hue;
    hsv.x = mod(hsv.x, 360.0);
    hsv.y *= u_saturation;
    hsv.z *= u_brightness;
    vec3 f_color = hsvtorgb(hsv);
    f_color = ((f_color - 0.5) * max(u_contrast + 1.0, 0.0)) + 0.5;
    gl_FragColor = v_fragmentColor * vec4(f_color, pixColor.a);
}
)";

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u_hue ： 色调H， 范围[0 ~ 1]， 默认0 u_saturation ： 饱和度 [0 ~ 2], 默认1 u_brightness ： 亮度 [0 ~ 2], 默认1 u_contrast ： 对比度 [0 ~ 2]， 默认0


初始化该主色器需要设置饱和度和亮度：

GLProgramState::getOrCreateWithGLProgramName(GLProgram::SHADER_NAME_POSITION_TEXTURE_COLOR_NO_MVP)->setUniformFloat("u_saturation", 1);
GLProgramState::getOrCreateWithGLProgramName(GLProgram::SHADER_NAME_POSITION_TEXTURE_COLOR_NO_MVP)->setUniformFloat("u_brightness", 1);

转载请注明出处，from 博客园 HemJohn