【Defold】modelコンポーネント用 カラー入れ替え シェーダー

attribute highp vec4 position;
attribute mediump vec2 texcoord0;
attribute mediump vec3 normal;
　
uniform mediump mat4 mtx_worldview;
uniform mediump mat4 mtx_view;
uniform mediump mat4 mtx_proj;
uniform mediump mat4 mtx_normal;
uniform mediump vec4 light;
　
varying highp vec4 var_position;
varying mediump vec3 var_normal;
varying mediump vec2 var_texcoord0;
　
void main()
{
    vec4 p = mtx_worldview * vec4(position.xyz, 1.0);
    var_position = p;
    var_texcoord0 = texcoord0;
    var_normal = normalize((mtx_normal * vec4(normal, 0.0)).xyz);
    gl_Position = mtx_proj * p;
}

varying highp vec4 var_position;
varying mediump vec3 var_normal;
varying mediump vec2 var_texcoord0;
 
uniform lowp sampler2D tex0;
uniform lowp sampler2D tex1;
uniform lowp vec4 tint;
uniform lowp vec4 _ColorSwapRed;
uniform lowp vec4 _ColorSwapRedLuminosity;
uniform lowp vec4 _ColorSwapGreen;
uniform lowp vec4 _ColorSwapGreenLuminosity;
uniform lowp vec4 _ColorSwapBlue;
uniform lowp vec4 _ColorSwapBlueLuminosity;
 
float saturate(float f)
{
    return clamp(f, 0.0, 1.0);
}
 
void main()
{
    // Pre-multiply alpha since all runtime textures already are
    vec4 tint_pm = vec4(tint.xyz * tint.w, tint.w);
    vec4 col = texture2D(tex0, var_texcoord0.xy) * tint_pm;
 
    float luminance = 0.3 * col.x + 0.59 * col.y + 0.11 * col.z;
 
    vec4 swapMask = texture2D(tex1, var_texcoord0.xy);
    swapMask.xyz *= swapMask.w;
                 
    vec4 redSwap = _ColorSwapRed * swapMask.x * col.w * saturate(luminance + _ColorSwapRedLuminosity.w);
    vec4 greenSwap = _ColorSwapGreen * swapMask.y * col.w * saturate(luminance + _ColorSwapGreenLuminosity.w);
    vec4 blueSwap = _ColorSwapBlue * swapMask.z * col.w * saturate(luminance + _ColorSwapBlueLuminosity.w);
 
    col.xyz = col.xyz * saturate(1.0 - swapMask.x - swapMask.y - swapMask.z);
    col.xyz = col.xyz + redSwap.xyz + greenSwap.xyz + blueSwap.xyz;
 
    gl_FragColor = col;
}