#version 450
// Copyright (c) 2025 Hans-Kristian Arntzen
// SPDX-License-Identifier: MIT

layout(location = 0) out vec2 vUV;
layout(location = 0, component = 2) out float vIntCoord;

layout(push_constant) uniform Registers
{
	vec2 uv_offset;
	vec2 half_texel_offset;
	float res_scale;
};

layout(constant_id = 0) const bool VERTICAL = false;

void main()
{
	if (gl_VertexIndex == 0)
		vUV = vec2(0.0, 0.0);
	else if (gl_VertexIndex == 1)
		vUV = vec2(0.0, 2.0);
	else
		vUV = vec2(2.0, 0.0);

	gl_Position = vec4(vUV * 2.0 - 1.0, 0.0, 1.0);

	if (VERTICAL)
		vIntCoord = vUV.y * res_scale;
	else
		vIntCoord = vUV.x * res_scale;

	vUV += uv_offset;
}