128 lines
4.1 KiB
C#
128 lines
4.1 KiB
C#
using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using System;
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namespace SemiColinGames {
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class Scene : IDisposable {
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const float DESIRED_ASPECT_RATIO = 1920.0f / 1080.0f;
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public bool Enabled = false;
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Color backgroundColor = Color.CornflowerBlue;
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readonly GraphicsDevice graphics;
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readonly Camera camera;
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readonly RenderTarget2D sceneTarget;
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readonly BasicEffect basicEffect;
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readonly SpriteBatch spriteBatch;
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public Scene(GraphicsDevice graphics, Camera camera) {
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this.graphics = graphics;
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this.camera = camera;
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sceneTarget = new RenderTarget2D(
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graphics, camera.Width, camera.Height, false /* mipmap */,
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graphics.PresentationParameters.BackBufferFormat, DepthFormat.Depth24);
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basicEffect = new BasicEffect(graphics) {
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World = Matrix.CreateTranslation(0, 0, 0),
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View = Matrix.CreateLookAt(Vector3.Backward, Vector3.Zero, Vector3.Up),
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VertexColorEnabled = true
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};
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spriteBatch = new SpriteBatch(graphics);
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}
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~Scene() {
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Dispose();
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}
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public void Dispose() {
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sceneTarget.Dispose();
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basicEffect.Dispose();
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spriteBatch.Dispose();
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GC.SuppressFinalize(this);
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}
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public void Draw(World world, Player player, LinesOfSight linesOfSight) {
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graphics.SetRenderTarget(null);
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graphics.Clear(backgroundColor);
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if (!Enabled) {
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return;
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}
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// Draw scene to sceneTarget.
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graphics.SetRenderTarget(sceneTarget);
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graphics.Clear(backgroundColor);
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// Draw parallax backgrounds.
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spriteBatch.Begin(SpriteSortMode.Deferred, null, SamplerState.LinearWrap, null, null);
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Rectangle bgTarget = new Rectangle(0, 0, camera.Width, camera.Height);
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float xScale = 1f / 16;
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for (int i = 0; i < Textures.Backgrounds.Length; i++) {
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int yOffset = Textures.Backgrounds[i].Get.Height - camera.Height - 24;
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Rectangle bgSource = new Rectangle(
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(int) (camera.Left * xScale), yOffset, camera.Width, camera.Height);
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spriteBatch.Draw(Textures.Backgrounds[i].Get, bgTarget, bgSource, Color.White);
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xScale *= 2;
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}
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spriteBatch.End();
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// Draw lines of sight.
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basicEffect.Projection = camera.Projection;
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if (Debug.Enabled) {
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linesOfSight.Draw(graphics, basicEffect);
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}
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// Set up transformation matrix for drawing world objects.
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Matrix transform = Matrix.CreateTranslation(-camera.Left, -camera.Top, 0);
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spriteBatch.Begin(
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SpriteSortMode.Deferred, null, SamplerState.LinearWrap, null, null, null, transform);
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// Draw background tiles.
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world.DrawBackground(spriteBatch);
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// Draw player.
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player.Draw(spriteBatch);
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// Draw foreground tiles.
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world.DrawForeground(spriteBatch);
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spriteBatch.End();
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// Draw debug rects & lines on top.
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Debug.Draw(graphics, basicEffect);
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// Get ready to draw sceneTarget to screen.
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graphics.SetRenderTarget(null);
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// Letterbox the scene if needed.
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float aspectRatio = 1.0f * graphics.Viewport.Width / graphics.Viewport.Height;
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Rectangle drawRect;
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if (aspectRatio > DESIRED_ASPECT_RATIO) {
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// Need to letterbox the sides.
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int desiredWidth = (int) (graphics.Viewport.Height * DESIRED_ASPECT_RATIO);
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int padding = (graphics.Viewport.Width - desiredWidth) / 2;
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drawRect = new Rectangle(padding, 0, desiredWidth, graphics.Viewport.Height);
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} else {
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// Need to letterbox the top / bottom.
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int desiredHeight = (int) (graphics.Viewport.Width / DESIRED_ASPECT_RATIO);
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int padding = (graphics.Viewport.Height - desiredHeight) / 2;
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drawRect = new Rectangle(0, padding, graphics.Viewport.Width, desiredHeight);
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}
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// Actually draw to screen.
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spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend,
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SamplerState.PointClamp, DepthStencilState.Default,
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RasterizerState.CullNone);
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spriteBatch.Draw(sceneTarget, drawRect, Color.White);
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// Draw debug toasts.
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Debug.DrawToasts(spriteBatch);
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spriteBatch.End();
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}
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}
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}
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