#version 150

in vec2 vertTexCoord;
in vec4 vertColor;
in float vertTextureIndex;

uniform sampler2D sdfTextures[8];
uniform float threshold;
uniform float smoothRange;

out vec4 fragColor;

void main() {
	float smoothMin = threshold - smoothRange * 0.5;
	float smoothMax = smoothMin + smoothRange;
	float sample = 0.0;
	sample += smoothstep(smoothMin, smoothMax, texture(sdfTextures[0], vertTexCoord).r) * int(vertTextureIndex == 0);
	sample += smoothstep(smoothMin, smoothMax, texture(sdfTextures[1], vertTexCoord).r) * int(vertTextureIndex == 1);
	sample += smoothstep(smoothMin, smoothMax, texture(sdfTextures[2], vertTexCoord).r) * int(vertTextureIndex == 2);
	sample += smoothstep(smoothMin, smoothMax, texture(sdfTextures[3], vertTexCoord).r) * int(vertTextureIndex == 3);
	sample += smoothstep(smoothMin, smoothMax, texture(sdfTextures[4], vertTexCoord).r) * int(vertTextureIndex == 4);
	sample += smoothstep(smoothMin, smoothMax, texture(sdfTextures[5], vertTexCoord).r) * int(vertTextureIndex == 5);
	sample += smoothstep(smoothMin, smoothMax, texture(sdfTextures[6], vertTexCoord).r) * int(vertTextureIndex == 6);
	sample += smoothstep(smoothMin, smoothMax, texture(sdfTextures[7], vertTexCoord).r) * int(vertTextureIndex == 7);
	fragColor = vec4(min(1.0, sample)) * vertColor;
}