/// <summary>
/// </summary>
/// <param name="arrayBuffer">
/// </param>
/// <returns>
/// </returns>
public static DDSInfo GetDDSInfo(byte[] arrayBuffer)
{
var header = ArrayConvert.AsInt(arrayBuffer, 0, headerLengthInt);
var mipmapCount = 1;
if ((header[off_flags] & DDSD_MIPMAPCOUNT) > 0)
{
mipmapCount = Math.Max(1, header[off_mipmapCount]);
}
return(new DDSInfoDts
{
width = header[off_width],
height = header[off_height],
mipmapCount = mipmapCount,
isFourCC = (header[off_pfFlags] & DDPF_FOURCC) == DDPF_FOURCC,
isRGB = (header[off_pfFlags] & DDPF_RGB) == DDPF_RGB,
isLuminance = (header[off_pfFlags] & DDPF_LUMINANCE) == DDPF_LUMINANCE,
isCube = (header[off_caps2] & DDSCAPS2_CUBEMAP) == DDSCAPS2_CUBEMAP
});
}
/// <summary>
/// </summary>
/// <param name="gl">
/// </param>
/// <param name="ext">
/// </param>
/// <param name="arrayBuffer">
/// </param>
/// <param name="info">
/// </param>
/// <param name="loadMipmaps">
/// </param>
/// <param name="faces">
/// </param>
public static void UploadDDSLevels(
WebGLRenderingContext gl, WEBGL_compressed_texture_s3tc ext, byte[] arrayBuffer, DDSInfo info, bool loadMipmaps, int faces)
{
var header = ArrayConvert.AsInt(arrayBuffer, 0, headerLengthInt);
int fourCC;
var blockBytes = 0;
var internalFormat = 0;
int width;
int height;
int dataLength;
int dataOffset;
byte[] byteArray;
int mipmapCount;
int i;
if (header[off_magic] != DDS_MAGIC)
{
Tools.Error("Invalid magic number in DDS header");
return;
}
if (!info.isFourCC && !info.isRGB && !info.isLuminance)
{
Tools.Error("Unsupported format, must contain a FourCC, RGB or LUMINANCE code");
return;
}
if (info.isFourCC)
{
fourCC = header[off_pfFourCC];
switch (fourCC)
{
case FOURCC_DXT1:
blockBytes = 8;
internalFormat = ext.COMPRESSED_RGBA_S3TC_DXT1_EXT;
break;
case FOURCC_DXT3:
blockBytes = 16;
internalFormat = ext.COMPRESSED_RGBA_S3TC_DXT3_EXT;
break;
case FOURCC_DXT5:
blockBytes = 16;
internalFormat = ext.COMPRESSED_RGBA_S3TC_DXT5_EXT;
break;
default:
Tools.Error(string.Format("Unsupported FourCC code: {0}", fourCC));
return;
}
}
mipmapCount = 1;
if ((header[off_flags] & DDSD_MIPMAPCOUNT) > 0 && loadMipmaps)
{
mipmapCount = Math.Max(1, header[off_mipmapCount]);
}
var bpp = header[off_RGBbpp];
for (var face = 0; face < faces; face++)
{
var sampler = (faces == 1) ? Gl.TEXTURE_2D : (Gl.TEXTURE_CUBE_MAP_POSITIVE_X + face);
width = header[off_width];
height = header[off_height];
dataOffset = header[off_size] + 4;
for (i = 0; i < mipmapCount; ++i)
{
if (info.isRGB)
{
if (bpp == 24)
{
dataLength = width * height * 3;
byteArray = GetRGBArrayBuffer(width, height, dataOffset, dataLength, arrayBuffer);
gl.texImage2D(sampler, i, Gl.RGB, width, height, 0, Gl.RGB, Gl.UNSIGNED_BYTE, byteArray);
}
else
{
dataLength = width * height * 4;
byteArray = GetRGBAArrayBuffer(width, height, dataOffset, dataLength, arrayBuffer);
gl.texImage2D(sampler, i, Gl.RGBA, width, height, 0, Gl.RGBA, Gl.UNSIGNED_BYTE, byteArray);
}
}
else if (info.isLuminance)
{
var unpackAlignment = (int)gl.getParameter(Gl.UNPACK_ALIGNMENT);
var unpaddedRowSize = width;
var paddedRowSize = (int)Math.Floor((double)(width + unpackAlignment - 1) / unpackAlignment) * unpackAlignment;
dataLength = paddedRowSize * (height - 1) + unpaddedRowSize;
byteArray = GetLuminanceArrayBuffer(width, height, dataOffset, dataLength, arrayBuffer);
gl.texImage2D(sampler, i, Gl.LUMINANCE, width, height, 0, Gl.LUMINANCE, Gl.UNSIGNED_BYTE, byteArray);
}
else
{
dataLength = Math.Max(4, width) / 4 * Math.Max(4, height) / 4 * blockBytes;
byteArray = ArrayConvert.AsByte(arrayBuffer, dataOffset, dataLength);
gl.compressedTexImage2D(sampler, i, internalFormat, width, height, 0, byteArray);
}
dataOffset += dataLength;
width /= 2;
height /= 2;
width = Math.Max(1, width);
height = Math.Max(1, height);
}
}
}