shaders.hlsl

//*********************************************************
//
// Copyright (c) Microsoft. All rights reserved.
// This code is licensed under the MIT License (MIT).
// THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY
// IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
// PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.
//
//*********************************************************

struct PSInput
{
	float4 position : SV_POSITION;
	float2 uv : TEXCOORD;
};

Texture2D g_texture : register(t0);
SamplerState g_sampler : register(s0);

float g_rotation : register(b0);

PSInput VSMain(float4 position : POSITION, float4 uv : TEXCOORD)
{
	PSInput result;

    float2 theta;
    sincos(g_rotation, theta.x, theta.y);

    float2x2 rotate2D = { theta.y, -theta.x, theta.x, theta.y };

    float2 offset = float2(0.5f, 0.5f);

    result.position = position;
	result.uv = mul(rotate2D, uv - offset) + offset;

	return result;
}

float4 PSMain(PSInput input) : SV_TARGET
{
	return g_texture.Sample(g_sampler, input.uv);
}