sneak/Shared/Scene.cs
Colin McMillen 3a8defcf3f Letterbox the scene if the aspect ratio is out-of-whack.
Fixes #23.

GitOrigin-RevId: 2da580115e44f2658e7f9b9d3d39a366d3a1bbfd
2020-02-25 20:24:19 -05:00

128 lines
4.1 KiB
C#

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