#version 460
#extension GL_EXT_nonuniform_qualifier : require

struct Vertex {
    vec2 pos;
    vec2 uv;
    vec4 color;
    float alpha;
    uint textureID;
};

layout(set = 0, binding = 0) uniform sampler2D globalTextures[];

layout(std430, set = 0, binding = 1) readonly buffer VertexBuffer {
    Vertex vertices[];
} vBuf;

layout(location = 0) out vec2 uv;
layout(location = 1) out vec4 color;
layout(location = 2) out flat uint tex_id;

void main() {

    Vertex testVertices[6] = Vertex[](
    Vertex(vec2(-0.5, -0.5), vec2(0.0, 0.0), vec4(1.0, 0.0, 0.0, 1.0), 1.0, 0),
    Vertex(vec2( 0.5, -0.5), vec2(1.0, 0.0), vec4(0.0, 1.0, 0.0, 1.0), 1.0, 0),
    Vertex(vec2(-0.5,  0.5), vec2(0.0, 1.0), vec4(0.0, 0.0, 1.0, 1.0), 1.0, 0),

    Vertex(vec2( 0.5,  0.5), vec2(1.0, 1.0), vec4(1.0, 1.0, 1.0, 1.0), 1.0, 0),
    Vertex(vec2(-0.5,  0.5), vec2(0.0, 1.0), vec4(0.0, 0.0, 1.0, 1.0), 1.0, 0),
    Vertex(vec2( 0.5, -0.5), vec2(1.0, 1.0), vec4(0.0, 1.0, 0.0, 1.0), 1.0, 0)
    );

    Vertex v = vBuf.vertices[gl_VertexIndex];

    uv = v.uv;
    color = v.color;
    tex_id = v.textureID;
    gl_Position = vec4(v.pos, 0.0, 1.0);
}