/* Copyright (c) 2025, Sascha Willems
 *
 * SPDX-License-Identifier: MIT
 *
 */

 struct VSOutput
{
    float4 Pos : SV_POSITION;
    float2 UV;
};

Sampler2D samplerColor;

[shader("vertex")]
VSOutput vertexMain(uint VertexIndex: SV_VertexID)
{
    VSOutput output;
    output.UV = float2((VertexIndex << 1) & 2, VertexIndex & 2);
    output.Pos = float4(output.UV * 2.0f + -1.0f, 0.0f, 1.0f);
    return output;
}

[shader("fragment")]
float4 fragmentMain(VSOutput input)
{
    return samplerColor.Sample(float2(input.UV.x, 1.0 - input.UV.y));
}