112 lines
3.2 KiB
C#
112 lines
3.2 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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using BluntDirectX.Direct3D;
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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(Sprite 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;
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}
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public static float V(Sprite 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;
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}
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public static float Constrain(float x, Range<float> range)
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{
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return x < range.Start ? range.Start : x > range.End ? range.End : x;
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}
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static PointF EncodeVertexAttributes(TextureChannel channel, int paletteLine)
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{
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Converter<TextureChannel, float> channelEncoder = delegate(TextureChannel c)
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{
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switch (c)
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{
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case TextureChannel.Red: return 0.75f;
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case TextureChannel.Green: return 0.25f;
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case TextureChannel.Blue: return -0.25f;
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case TextureChannel.Alpha: return -0.75f;
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default:
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throw new ArgumentException();
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}
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};
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return new PointF(paletteLine / 16.0f, channelEncoder(channel));
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}
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public static Vertex MakeVertex(PointF o, float u, float v, Sprite r, int palette)
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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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PointF p = EncodeVertexAttributes(r.channel, palette);
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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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p.X, p.Y);
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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, Sprite r, int palette)
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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, palette));
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vertices.Add(Util.MakeVertex(o, 1, 0, r, palette));
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vertices.Add(Util.MakeVertex(o, 0, 1, r, palette));
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vertices.Add(Util.MakeVertex(o, 1, 1, r, palette));
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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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public static void CopyIntoChannel(Sprite dest, byte[] src)
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{
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for (int i = 0; i < dest.size.Width; i++)
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for (int j = 0; j < dest.size.Height; j++)
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{
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Point p = new Point(dest.origin.X + i, dest.origin.Y + j);
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byte b = src[i + dest.size.Width * j];
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Color original = dest.sheet.bitmap.GetPixel(p.X, p.Y);
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dest.sheet.bitmap.SetPixel(p.X, p.Y, ReplaceChannel(original, dest.channel, b));
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}
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}
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static Color ReplaceChannel(Color o, TextureChannel channel, byte p)
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{
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switch (channel)
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{
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case TextureChannel.Red: return Color.FromArgb(o.A, p, o.G, o.B);
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case TextureChannel.Green: return Color.FromArgb(o.A, o.R, p, o.B);
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case TextureChannel.Blue: return Color.FromArgb(o.A, o.R, o.G, p);
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case TextureChannel.Alpha: return Color.FromArgb(p, o.R, o.G, o.B);
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default:
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throw new ArgumentException();
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}
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}
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}
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}
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