(旧Siv3D) ポストエフェクトを使用し、描画結果を等倍拡大する

code:scale.cpp

struct ParamScale

{

float scale;

};

void setScale(const int scale)

{

ConstantBuffer<ParamScale> cb;

cb->scale = scale;

PostEffect::SetConstant(ShaderStage::Pixel, 1, cb);

}

void Main()

{

Window::Resize(640, 480);

Graphics::SetBackground(Palette::Black);

int scale = 2;

PostEffect::Register(PixelShader(L"scale.hlsl"));

setScale(scale);

const Texture texture(L"Example/Siv3D-kun.png");

while (System::Update())

{

if (Input::KeyUp.clicked)

{

scale = Min(scale + 1, 4);

setScale(scale);

}

else if (Input::KeyDown.clicked)

{

scale = Max(scale - 1, 1);

setScale(scale);

}

texture.draw();

PutText(L"scale = ", scale).from(2, 2);

}

}

code:scale.hlsl

Texture2D texture0 : register( t0 );

SamplerState sampler0 : register( s0 );

struct VS_OUTPUT

{

float4 position : SV_POSITION;

float2 tex : TEXCOORD0;

float4 color : COLOR0;

};

cbuffer psConstants1 : register( b1 )

{

float g_scale;

};

float4 PS(VS_OUTPUT input) : SV_Target

{

return texture0.Sample(sampler0, input.tex / g_scale) * input.color;

}