/* $Id: d3d11blitter.hlsl 95148 2022-05-31 16:55:16Z vboxsync $ */
/*
 * Blitter for dxgiBlt/SVGA_3D_CMD_DX_PRESENTBLT.
 *
 * fxc /nologo /Fhd3d11blitter.hlsl.vs.h /Evs_blitter /Tvs_5_0 d3d11blitter.hlsl
 * fxc /nologo /Fhd3d11blitter.hlsl.ps.h /Eps_blitter /Tps_5_0 d3d11blitter.hlsl
 */

/*
 * Copyright (C) 2022 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 */

Texture2D t;
sampler s;

cbuffer VSParameters
{
    float scaleX;
    float scaleY;
    float shiftX;
    float shiftY;
};

struct VSInput
{
    uint VertexID   : SV_VertexID;
};

struct VSOutput
{
    float4 position : SV_POSITION;
    float2 texcoord : TEXCOORD0;
    float2 alpha    : TEXCOORD1;
};

VSOutput vs_blitter(VSInput input)
{
    VSOutput output;

    float x = (input.VertexID & 1) ? 1.0f : -1.0f;
    float y = (input.VertexID & 2) ? -1.0f : 1.0f;
    x = x * scaleX + shiftX;
    y = y * scaleY + shiftY;
    output.position = float4(x, y, 0.0f, 1.0f);

    output.texcoord.x = (input.VertexID & 1) ? 1.0f : 0.0f;
    output.texcoord.y = (input.VertexID & 2) ? 1.0f : 0.0f;

    output.alpha = float2(1.0f, 0.0f);

    return output;
}

float4 ps_blitter(VSOutput input) : SV_TARGET
{
    return float4(t.Sample(s, input.texcoord).rgb, input.alpha.x);
}