protected override void RenderInternal(Triangle[] triangles, Effect effect, Matrix3x2?transform)
{
var brushEffect = (LinearGradientBrushEffect)effect;
var graphicsDevice = DrawingContext.GraphicsDevice;
var brushProps = BrushProperties;
var props = Properties;
var gsc = GradientStopCollection;
var projection = DrawingContext.DefaultOrthographicProjection;
var world = transform?.ToMatrix4x4() ?? BrushEffect.DefaultWorld;
brushEffect.SetWorldViewProjection(world, BrushEffect.DefaultView, projection);
brushEffect.Opacity = brushProps.Opacity;
brushEffect.SetGradientStops(gsc.GradientStopsDirect);
brushEffect.Gamma = gsc.Gamma;
brushEffect.ExtendMode = gsc.ExtendMode;
brushEffect.StartPoint = props.StartPoint;
brushEffect.EndPoint = props.EndPoint;
graphicsDevice.RasterizerState = DefaultBrushRasterizerState;
graphicsDevice.DepthStencilState = DefaultBrushDepthStencilState;
brushEffect.Apply();
var vertices = new Vector2[triangles.Length * 3];
var indices = new uint[triangles.Length * 3];
for (var i = 0; i < triangles.Length; ++i)
{
var s = i * 3;
vertices[s] = Matrix3x2.Transform(brushProps.Transform, triangles[i].Point1);
vertices[s + 1] = Matrix3x2.Transform(brushProps.Transform, triangles[i].Point2);
vertices[s + 2] = Matrix3x2.Transform(brushProps.Transform, triangles[i].Point3);
}
for (var i = 0; i < indices.Length; ++i)
{
indices[i] = (uint)i;
}
using (var vertexBuffer = new VertexBuffer(graphicsDevice, new VertexDeclaration(VertexElements), vertices.Length, BufferUsage.WriteOnly)) {
using (var indexBuffer = new IndexBuffer(graphicsDevice, IndexElementSize.ThirtyTwoBits, indices.Length, BufferUsage.WriteOnly)) {
vertexBuffer.SetData(vertices);
indexBuffer.SetData(indices);
graphicsDevice.SetVertexBuffer(vertexBuffer);
graphicsDevice.Indices = indexBuffer;
graphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, triangles.Length);
graphicsDevice.SetVertexBuffer(null);
graphicsDevice.Indices = null;
}
}
}
