开发视频投影的过程中，有需求要调整画面的饱和度、灰度、亮度。
记录一下关键代码和效果。
关键代码
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| vec4 colorCorrection(vec4 originalColor, float saturation, float brightness, float contrast){
float gray = 0.2125 * originalColor.r + 0.7154 * originalColor.g + 0.0721 * originalColor.b;
vec3 grayColor = vec3(gray, gray, gray);
vec3 finalColor = mix(grayColor, originalColor.rgb, saturation);
finalColor = finalColor * brightness;
float avgValue = 0.5 * brightness;
vec3 avgColor = vec3(avgValue, avgValue, avgValue);
finalColor = mix(avgColor, finalColor, contrast);
return vec4(finalColor, originalColor.a);
}
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效果