59 lines
1.6 KiB
C#
59 lines
1.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using OpenRa.FileFormats;
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using System.Drawing;
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namespace OpenRa.Game
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{
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static class Util
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{
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public static float U(SheetRectangle<Sheet> s, float u)
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{
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float u0 = (float)(s.origin.X + 0.5f) / (float)s.sheet.bitmap.Width;
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float u1 = (float)(s.origin.X + s.size.Width) / (float)s.sheet.bitmap.Width;
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return (u > 0) ? u1 : u0;// (1 - u) * u0 + u * u1;
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}
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public static float V(SheetRectangle<Sheet> s, float v)
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{
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float v0 = (float)(s.origin.Y + 0.5f) / (float)s.sheet.bitmap.Height;
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float v1 = (float)(s.origin.Y + s.size.Height) / (float)s.sheet.bitmap.Height;
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return (v > 0) ? v1 : v0;// return (1 - v) * v0 + v * v1;
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}
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public static Vertex MakeVertex(PointF o, float u, float v, SheetRectangle<Sheet> r)
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{
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float x2 = o.X + r.size.Width;
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float y2 = o.Y + r.size.Height;
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return new Vertex(Lerp(o.X, x2, u), Lerp(o.Y, y2, v), 0, U(r, u), V(r, v));
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}
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static float Lerp(float a, float b, float t)
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{
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return (1 - t) * a + t * b;
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}
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public static void CreateQuad(List<Vertex> vertices, List<ushort> indices, PointF o, SheetRectangle<Sheet> r)
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{
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ushort offset = (ushort)vertices.Count;
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vertices.Add(Util.MakeVertex(o, 0, 0, r));
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vertices.Add(Util.MakeVertex(o, 1, 0, r));
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vertices.Add(Util.MakeVertex(o, 0, 1, r));
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vertices.Add(Util.MakeVertex(o, 1, 1, r));
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indices.Add(offset);
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indices.Add((ushort)(offset + 1));
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indices.Add((ushort)(offset + 2));
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indices.Add((ushort)(offset + 1));
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indices.Add((ushort)(offset + 3));
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indices.Add((ushort)(offset + 2));
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}
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}
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}
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