void Start()
{
// load tga
TGAInfo tgaInfo = TGAParser.loadTGAData(File.ReadAllBytes("wtf.tga"));
Texture2D texture = new Texture2D(1, 1);
// 判断用哪种纹理格式
TextureFormat format = texture.format;
if (tgaInfo.bitDepth == 24)
{
format = TextureFormat.RGB24;
}
else if (tgaInfo.bitDepth == 32)
{
format = TextureFormat.ARGB32;
}
texture.Resize(tgaInfo.width, tgaInfo.height, format, false); // 主要为了设置一下format
texture.SetPixels32(tgaInfo.data);
texture.Apply();
}
public static TGAInfo loadTGAData(byte[] data)
{
if (data.Length < 1)
{
Debug.LogError("没数据");
return(new TGAInfo());
}
// 读入流后开始装逼
MemoryStream str = new MemoryStream(data);
// 开始读取数据
BinaryReader binReader = new BinaryReader(str);
// 跳过文件头的12个字节
binReader.BaseStream.Seek(12, SeekOrigin.Begin);
// 图片宽高数据, 8个字节
int width = binReader.ReadInt16();
int height = binReader.ReadInt16();
// 像素深度, 1字节
int bitDepth = binReader.ReadByte();
// 图像描述符, 1字节， 没啥卵用， 跳过
binReader.BaseStream.Seek(1, SeekOrigin.Current);
// 像素数据
Color32[] pxData = new Color32[width * height];
// 要看TGA的位深是24还是32， 处理时要考虑alpha通道的数值
if (bitDepth == 24)
{
for (int i = 0; i < width * height; i++)
{
// 坑爹， bgr
byte b = binReader.ReadByte();
byte g = binReader.ReadByte();
byte r = binReader.ReadByte();
pxData[i] = new Color32(r, g, b, 1);
}
}
else if (bitDepth == 32)
{
for (int i = 0; i < width * height; i++)
{
// bgra
byte b = binReader.ReadByte();
byte g = binReader.ReadByte();
byte r = binReader.ReadByte();
byte a = binReader.ReadByte();
pxData[i] = new Color32(r, g, b, a);
}
}
// ** 底下其实还有一堆数据， 啥开发者区域、拓展区域、注脚啥的
// 返回TGA的数据
TGAInfo ret = new TGAInfo();
ret.width = width;
ret.height = height;
ret.data = pxData;
ret.bitDepth = bitDepth;
return(ret);
}
