Browse Source
* An arbitrary number of background layers can now be created and deleted
using AddLayer and RemoveLayer.
* The SdlWindow's Background object now points to Layer 0, which cannot be
deleted. This should ensure that no code has been broken by this.
* A basic sample project has been added to demonstrate this new feature.
improved_timing
6 changed files with 196 additions and 28 deletions
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namespace Sample.Layers { |
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internal class Program { |
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private static void Main(string[] args) { |
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var window = new Window(4); |
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window.Start(16); |
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} |
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} |
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} |
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<Project Sdk="Microsoft.NET.Sdk"> |
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<PropertyGroup> |
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<OutputType>Exe</OutputType> |
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<TargetFramework>netcoreapp2.2</TargetFramework> |
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<LangVersion>7.2</LangVersion> |
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</PropertyGroup> |
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<ItemGroup> |
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<ProjectReference Include="..\..\DotSDL\DotSDL.csproj" /> |
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</ItemGroup> |
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</Project> |
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using System; |
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using DotSDL.Events; |
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using DotSDL.Graphics; |
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using DotSDL.Input.Keyboard; |
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namespace Sample.Layers { |
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public class Window : SdlWindow { |
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private const double Amplitude = 32.0f; |
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private const double Period = Math.PI * 4; |
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private readonly int _redLayer, _greenLayer, _blueLayer; |
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private double _redPhase = 0.0, _greenPhase = 2.0, _bluePhase = 4.0; |
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private const double RedSpeed = 0.010, GreenSpeed = 0.015, BlueSpeed = 0.020; |
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public Window(int scale) : base("Layer Test", |
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new Point(WindowPosUndefined, WindowPosUndefined), |
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256 * scale, 196 * scale, |
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256, 196) { |
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KeyPressed += OnKeyPressed; |
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// Base background layer. |
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for(var i = RenderHeight / 2 * RenderWidth; i < RenderHeight / 2 * RenderWidth + RenderWidth; i++) { |
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Background.Pixels[i].A = 255; |
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Background.Pixels[i].R = |
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Background.Pixels[i].G = |
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Background.Pixels[i].B = 32; |
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} |
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for(var i = (RenderHeight / 2 + 1) * RenderWidth; i < RenderWidth * RenderHeight; i++) { |
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Background.Pixels[i].A = 255; |
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Background.Pixels[i].R = |
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Background.Pixels[i].G = |
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Background.Pixels[i].B = 64; |
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} |
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// Add new layers. |
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_redLayer = AddLayer(RenderWidth, RenderHeight, BlendMode.Additive); |
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_greenLayer = AddLayer(RenderWidth, RenderHeight, BlendMode.Additive); |
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_blueLayer = AddLayer(RenderWidth, RenderHeight, BlendMode.Additive); |
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} |
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private void DrawSlice(in Color[] pixels, int x, double phase, byte rVal, byte gVal, byte bVal) { |
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var val = Math.Abs(Math.Sin((double)x / RenderWidth * Period + phase)); |
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var yMax = val * Amplitude; |
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var yMaxInt = (int)yMax; |
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var center = RenderHeight / 2; |
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Func<int, int, int> pos = (xPix, yPix) => (yPix + center) * RenderWidth + xPix; |
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for(var y = -yMaxInt; y < yMaxInt + 1; y++) { |
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var idx = pos(x, y); |
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pixels[idx].A = 255; |
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pixels[idx].R = rVal; |
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pixels[idx].G = gVal; |
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pixels[idx].B = bVal; |
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} |
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// Update the alpha value on the top/bottom pixels to make it sorta look |
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// antialiased. :) |
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pixels[pos(x, yMaxInt)].A = pixels[pos(x, -yMaxInt)].A = (byte)(255.0 * (yMax - yMaxInt)); |
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} |
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protected override void OnDraw() { |
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// Clear the sine wave from each of the layers. |
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for(var i = (RenderHeight / 2 - (int)Amplitude) * RenderWidth; i < (RenderHeight / 2 + (int)Amplitude) * RenderWidth; i++) { |
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Layers[_redLayer].Pixels[i].R = 0; |
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Layers[_greenLayer].Pixels[i].G = 0; |
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Layers[_blueLayer].Pixels[i].B = 0; |
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} |
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for(var x = 0; x < RenderWidth; x++) { |
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DrawSlice(Layers[_redLayer].Pixels, x, _redPhase, 255, 0, 0); |
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DrawSlice(Layers[_greenLayer].Pixels, x, _greenPhase, 0, 255, 0); |
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DrawSlice(Layers[_blueLayer].Pixels, x, _bluePhase, 0, 0, 255); |
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} |
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} |
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private void OnKeyPressed(object sender, KeyboardEvent e) { |
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if(e.Keycode == Keycode.Escape) |
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Stop(); |
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} |
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protected override void OnUpdate() { |
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_redPhase += RedSpeed; |
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_greenPhase += GreenSpeed; |
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_bluePhase += BlueSpeed; |
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} |
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} |
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} |
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