
#version 330 core
in vec2 texCoord;
in vec4 vertexFragColor;
out vec4 fragColor;

uniform sampler2D tex;
uniform sampler2D lut;

vec4 sampleAs3DTexture(sampler2D texture, vec3 uv, float width) {
    float innerWidth = width - 1.0;
	float sliceSize = 1.0 / width;              // space of 1 slice
    float slicePixelSize = sliceSize / width;           // space of 1 pixel
    float sliceInnerSize = slicePixelSize * (innerWidth);  // space of width pixels
    float zSlice0 = min(floor(uv.z * width), innerWidth);
    float zSlice1 = min(zSlice0 + 1.0, innerWidth);
    float xOffset = slicePixelSize * 0.5 + uv.x * sliceInnerSize;
    float s0 = xOffset + (zSlice0 * sliceSize);
    float s1 = xOffset + (zSlice1 * sliceSize);
	float yPixelSize = sliceSize;
	float yOffset = yPixelSize * 0.5 + uv.y * (1.0 - yPixelSize);
    vec4 slice0Color = texture2D(texture, vec2(s0, yOffset));
    vec4 slice1Color = texture2D(texture, vec2(s1, yOffset));
    float zOffset = mod(uv.z * width, 1.0);
    vec4 result = mix(slice0Color, slice1Color, zOffset);
    return result;
}
void main()
{

    vec4 color2 = texture2D(tex, texCoord.st);
	color2.y	= 1.0 - color2.y;
	vec4 target = sampleAs3DTexture(lut,color2.rgb,16);

   fragColor = target;


   
}