117 lines
4.1 KiB
C#
117 lines
4.1 KiB
C#
using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using RecrownedAthenaeum.Camera;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace RecrownedAthenaeum.Render
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{
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public class PrimitiveBatch : IDisposable
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{
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VertexPositionColor[] vertices;
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int MaxVertices { get { return vertices.Length; } }
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int bufferPosition;
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BasicEffect basicEffect;
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PrimitiveType primitiveType;
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int verticesPerPrimitive;
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GraphicsDevice graphicsDevice;
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bool began;
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bool isDisposed;
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/// <summary>
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/// Creates a batch used to draw primitives.
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/// </summary>
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/// <param name="graphicsDevice">The current graphics device being used.</param>
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/// <param name="camera">The current camera being used.</param>
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/// <param name="verticesPerBatch">The amount of vertices every batch can hold before flushing. Default is 450.</param>
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public PrimitiveBatch(GraphicsDevice graphicsDevice, Camera2D camera, int verticesPerBatch = 450)
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{
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this.graphicsDevice = graphicsDevice ?? throw new ArgumentNullException("Graphics device can't be null.");
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basicEffect = new BasicEffect(graphicsDevice);
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basicEffect.VertexColorEnabled = true;
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basicEffect.View = camera.Matrix;
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vertices = new VertexPositionColor[verticesPerBatch];
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}
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/// <summary>
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/// Starts the batch. Batch cannot be started twice.
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/// </summary>
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/// <param name="primitiveType">The type of primitive this batch would be drawing.</param>
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public void Begin(PrimitiveType primitiveType)
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{
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if (began) throw new InvalidOperationException("Begin is being called twice before being ended.");
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this.primitiveType = primitiveType;
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this.verticesPerPrimitive = 0;
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switch (primitiveType)
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{
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case PrimitiveType.LineList: verticesPerPrimitive = 2; break;
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case PrimitiveType.TriangleList: verticesPerPrimitive = 3; break;
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}
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basicEffect.CurrentTechnique.Passes[0].Apply();
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began = true;
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}
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/// <summary>
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/// Ends the batch. Begin needs to be called before end.
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/// </summary>
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public void End()
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{
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if (!began) throw new InvalidOperationException("Begin must be called before ending.");
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Flush();
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}
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/// <summary>
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/// Adds a vertex position for the primitive being drawn. The batch needs to have beens started before this.
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/// </summary>
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/// <param name="vertex">The vector that represents the vertex.</param>
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/// <param name="color">The color of that vertex.</param>
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public void AddVertex(Vector2 vertex, Color color)
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{
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if (!began) throw new InvalidOperationException("Begin needs to be called before adding vertex.");
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if (bufferPosition + verticesPerPrimitive >= MaxVertices && (bufferPosition % MaxVertices == 0))
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{
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Flush();
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}
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vertices[bufferPosition].Position = (new Vector3(vertex, 0));
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vertices[bufferPosition].Color = color;
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bufferPosition++;
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}
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/// <summary>
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/// Flushes the batch. Automatically called if required.
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/// </summary>
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public void Flush()
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{
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if (!began) throw new InvalidOperationException("Begin needs to be called before flushing.");
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if (bufferPosition == 0) return;
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graphicsDevice.DrawUserPrimitives(primitiveType, vertices, 0, bufferPosition / verticesPerPrimitive);
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bufferPosition = 0;
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}
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public void Dispose()
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{
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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public void Dispose(bool disposing)
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{
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if (disposing && !isDisposed)
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{
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basicEffect.Dispose();
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isDisposed = true;
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}
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}
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}
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}
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