79 lines
2.5 KiB
C#
79 lines
2.5 KiB
C#
using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using Engine.Core;
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namespace Engine.Integration.MonoGame;
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public class TriangleBatch : ITriangleBatch
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{
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private readonly GraphicsDevice graphicsDevice;
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private VertexBuffer vertexBuffer = default!;
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private readonly VertexPositionColor[] vertices = new VertexPositionColor[1024];
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private int verticesIndex = 0;
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private Matrix _view;
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private Matrix _projection;
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private readonly BasicEffect basicEffect;
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private readonly RasterizerState rasterizerState = new() { CullMode = CullMode.None };
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public TriangleBatch(GraphicsDevice graphicsDevice)
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{
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this.graphicsDevice = graphicsDevice;
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basicEffect = new(graphicsDevice);
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basicEffect.VertexColorEnabled = true;
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vertexBuffer = new VertexBuffer(graphicsDevice, typeof(VertexPositionColor), 1024, BufferUsage.WriteOnly);
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}
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public void Draw(Triangle triangle, ColorRGBA colorRGBA)
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{
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if (verticesIndex + 3 >= vertices.Length)
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Flush();
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Vector2 A = triangle.A.ToDisplayVector2();
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Vector2 B = triangle.B.ToDisplayVector2();
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Vector2 C = triangle.C.ToDisplayVector2();
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Color color = colorRGBA.ToColor();
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vertices[verticesIndex++] = new(new(A.X, A.Y, 0f), color);
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vertices[verticesIndex++] = new(new(B.X, B.Y, 0f), color);
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vertices[verticesIndex++] = new(new(C.X, C.Y, 0f), color);
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}
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public void Begin(Matrix? view = null, Matrix? projection = null)
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{
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if (view != null)
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_view = view.Value;
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else
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_view = Matrix.Identity;
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if (projection != null)
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_projection = projection.Value;
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else
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{
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Viewport viewport = graphicsDevice.Viewport;
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_projection = Matrix.CreateOrthographicOffCenter(viewport.X, viewport.Width, viewport.Height, viewport.Y, 0, 1);
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}
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}
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public void End() => Flush();
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private void Flush()
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{
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if (verticesIndex == 0)
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return;
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graphicsDevice.RasterizerState = rasterizerState;
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basicEffect.Projection = _projection;
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basicEffect.View = _view;
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vertexBuffer.SetData(vertices);
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graphicsDevice.SetVertexBuffer(vertexBuffer);
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foreach (EffectPass pass in basicEffect.CurrentTechnique.Passes)
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pass.Apply();
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graphicsDevice.DrawPrimitives(PrimitiveType.TriangleList, 0, verticesIndex / 3);
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verticesIndex = 0;
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}
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}
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