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Improve performance of line rendering.

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- Create an overload that renders a line in one color, as this allows most existing calls to be simplified. This also allows a slight performance improvement by only normalizing the components once.
- Introduce a DrawLineStrip method. This improves performance by allowing the color components to be normalized once for the whole strip, and only needing to calculate vertices once per point rather than twice since we can reuse the last result.
This commit is contained in:
RoosterDragon
2015-05-19 20:50:51 +01:00
parent 9397749118
commit b9ebeaadca
12 changed files with 138 additions and 100 deletions
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73
OpenRA.Game/Graphics/LineRenderer.cs
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@@ -9,6 +9,7 @@
#endregion
using System;
using System.Collections.Generic;
using System.Drawing;
namespace OpenRA.Graphics
@@ -69,10 +70,25 @@ namespace OpenRA.Graphics
{
var tr = new float2(br.X, tl.Y);
var bl = new float2(tl.X, br.Y);
DrawLine(tl, tr, c, c);
DrawLine(tl, bl, c, c);
DrawLine(tr, br, c, c);
DrawLine(bl, br, c, c);
DrawLine(tl, tr, c);
DrawLine(tl, bl, c);
DrawLine(tr, br, c);
DrawLine(bl, br, c);
}
public void DrawLine(float2 start, float2 end, Color color)
{
renderer.CurrentBatchRenderer = this;
if (nv + 2 > renderer.TempBufferSize)
Flush();
var r = color.R / 255.0f;
var g = color.G / 255.0f;
var b = color.B / 255.0f;
var a = color.A / 255.0f;
vertices[nv++] = new Vertex(start + Offset, r, g, b, a);
vertices[nv++] = new Vertex(end + Offset, r, g, b, a);
}
public void DrawLine(float2 start, float2 end, Color startColor, Color endColor)
@@ -82,19 +98,52 @@ namespace OpenRA.Graphics
if (nv + 2 > renderer.TempBufferSize)
Flush();
vertices[nv++] = new Vertex(start + Offset,
startColor.R / 255.0f, startColor.G / 255.0f,
startColor.B / 255.0f, startColor.A / 255.0f);
var r = startColor.R / 255.0f;
var g = startColor.G / 255.0f;
var b = startColor.B / 255.0f;
var a = startColor.A / 255.0f;
vertices[nv++] = new Vertex(start + Offset, r, g, b, a);
vertices[nv++] = new Vertex(end + Offset,
endColor.R / 255.0f, endColor.G / 255.0f,
endColor.B / 255.0f, endColor.A / 255.0f);
r = endColor.R / 255.0f;
g = endColor.G / 255.0f;
b = endColor.B / 255.0f;
a = endColor.A / 255.0f;
vertices[nv++] = new Vertex(end + Offset, r, g, b, a);
}
public void DrawLineStrip(IEnumerable<float2> points, Color color)
{
renderer.CurrentBatchRenderer = this;
var r = color.R / 255.0f;
var g = color.G / 255.0f;
var b = color.B / 255.0f;
var a = color.A / 255.0f;
var first = true;
var prev = new Vertex();
foreach (var point in points)
{
if (first)
{
first = false;
prev = new Vertex(point + Offset, r, g, b, a);
continue;
}
if (nv + 2 > renderer.TempBufferSize)
Flush();
vertices[nv++] = prev;
prev = new Vertex(point + Offset, r, g, b, a);
vertices[nv++] = prev;
}
}
public void FillRect(RectangleF r, Color color)
{
for (var y = r.Top; y < r.Bottom; y++)
DrawLine(new float2(r.Left, y), new float2(r.Right, y), color, color);
DrawLine(new float2(r.Left, y), new float2(r.Right, y), color);
}
public void FillEllipse(RectangleF r, Color color)
@@ -106,7 +155,7 @@ namespace OpenRA.Graphics
for (var y = r.Top; y <= r.Bottom; y++)
{
var dx = a * (float)Math.Sqrt(1 - (y - yc) * (y - yc) / b / b);
DrawLine(new float2(xc - dx, y), new float2(xc + dx, y), color, color);
DrawLine(new float2(xc - dx, y), new float2(xc + dx, y), color);
}
}