#version 410
in float partId;
out vec4 fragColorV;
in vec2 uv;

in float partSlot;
in vec2 xy;

uniform sampler2D partValues;
uniform float partIndex_translate; // vec4 as x, y, z, scale
uniform vec2 meScreenSize;




void main(void)
{
    vec4 partTranslate = texture(partValues, vec2(partIndex_translate, partSlot));

    // One. X & Y. & Z, too.
    vec4 pos = vec4(xy.x, xy.y, partTranslate.z, 1.0);
    pos.xy += partTranslate.xy;
    pos.xy /= meScreenSize;
    pos.xy = pos.xy * 2.0 - vec2(1.0, 1.0); // convert from [0,1] to [-1,+1]
    pos.y = -pos.y; // Argh, after all that, I want pixel coords for all this. eeeee.
    gl_Position = pos;

    // Two. Fragcolor based on partId and st values.
    
    fragColorV.r = uv.x;
    fragColorV.g = uv.y;
    fragColorV.b = partId;
    fragColorV.a = pos.z;
}