sneak/Shared/Scene.cs
Colin McMillen b06155aa88 Render backgrounds from back-to-front in an array.
GitOrigin-RevId: 1f4ca760d4dc4a73a4f96f6b04ee2929e789a5eb
2020-02-19 15:07:44 -05:00

105 lines
3.5 KiB
C#

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
namespace SemiColinGames {
class Scene {
public bool Enabled = false;
Color backgroundColor = Color.CornflowerBlue;
readonly GraphicsDevice graphics;
readonly Camera camera;
readonly RenderTarget2D sceneTarget;
readonly RenderTarget2D lightingTarget;
readonly BasicEffect lightingEffect;
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);
lightingTarget = new RenderTarget2D(
graphics, camera.Width, camera.Height, false /* mipmap */,
graphics.PresentationParameters.BackBufferFormat, DepthFormat.Depth24);
lightingEffect = new BasicEffect(graphics) {
World = Matrix.CreateTranslation(0, 0, 0),
View = Matrix.CreateLookAt(Vector3.Backward, Vector3.Zero, Vector3.Up),
VertexColorEnabled = true
};
spriteBatch = new SpriteBatch(graphics);
}
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 background.
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].Height - camera.Height - 24;
Rectangle bgSource = new Rectangle(
(int) (camera.Left * xScale), yOffset, camera.Width, camera.Height);
spriteBatch.Draw(Textures.Backgrounds[i], bgTarget, bgSource, Color.White);
xScale *= 2;
}
spriteBatch.End();
// 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 player.
player.Draw(spriteBatch);
// Draw foreground tiles.
world.Draw(spriteBatch);
// Aaaaand we're done.
spriteBatch.End();
// Draw lighting to lightingTarget.
graphics.SetRenderTarget(lightingTarget);
graphics.Clear(new Color(0, 0, 0, 0f));
lightingEffect.Projection = camera.Projection;
linesOfSight.Draw(player, world.CollisionTargets, graphics, lightingEffect);
// Draw debug rects & lines on top.
Debug.Draw(graphics, lightingEffect);
// Draw sceneTarget to screen.
graphics.SetRenderTarget(null);
spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend,
SamplerState.PointClamp, DepthStencilState.Default,
RasterizerState.CullNone);
Rectangle drawRect = new Rectangle(
0, 0, graphics.Viewport.Width, graphics.Viewport.Height);
spriteBatch.Draw(sceneTarget, drawRect, Color.White);
spriteBatch.Draw(lightingTarget, drawRect, Color.White);
// Draw debug toasts.
Debug.DrawToasts(spriteBatch);
spriteBatch.End();
}
}
}