update README with usage details

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Evan Hemsley 2020-07-17 13:56:08 -07:00
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# ResolutionScaler
A simple script for managing resolution scaling in FNA.
## Usage
Call **ResolutionScaler.Init** with your display width and height, and your virtual width and height.
```cs
Resolution.Init(
GraphicsDevice.PresentationParameters.BackBufferWidth,
GraphicsDevice.PresentationParameters.BackBufferHeight,
PLAY_AREA_WIDTH,
PLAY_AREA_HEIGHT
);
```
Then you can pass **ResolutionScaler.TransformMatrix** to FNA's *SpriteBatch* to properly transform your game's render target.
```cs
SpriteBatch.Begin(
SpriteSortMode.Deferred,
null,
null,
null,
null,
null,
Resolution.TransformMatrix
);
SpriteBatch.Draw(
GameRenderTarget,
Vector2.Zero,
Color.White
);
SpriteBatch.End();
```