/// <summary>
/// Creates a texture on the GPU with the chosen parameters
/// </summary>
/// <param name="bitmapBlock"></param>
/// <param name="textureMagFilter"></param>
/// <param name="textureMinFilter"></param>
public void Load(BitmapDataBlock bitmapBlock,
TextureMagFilter textureMagFilter = TextureMagFilter.Linear,
TextureMinFilter textureMinFilter = TextureMinFilter.Linear)
{
var buffer = bitmapBlock.GetResourceData( );
if (buffer == null)
{
return;
}
var width = bitmapBlock.Width;
var height = bitmapBlock.Height;
var bytesPerPixel = GetBitSize(bitmapBlock.Format) / 8.0f;
if (bitmapBlock.BitmapDataFlags.HasFlag(BitmapDataBlock.Flags.Palettized))
{
LoadPalettedTexture(bitmapBlock, P8ColourBytes, textureMagFilter, textureMinFilter);
return;
}
if (bitmapBlock.BitmapDataFlags.HasFlag(BitmapDataBlock.Flags.Swizzled))
{
buffer = Swizzler.Swizzle(buffer, ( int )bytesPerPixel, width, height);
}
var pixelInternalFormat = GetPixelInternalFormat(bitmapBlock.Format);
switch (bitmapBlock.Type)
{
case BitmapDataBlock.TypeEnum.Texture2D:
{
LoadTexture2D(textureMagFilter, textureMinFilter, bytesPerPixel, width, height, buffer,
bitmapBlock, pixelInternalFormat);
}
break;
case BitmapDataBlock.TypeEnum.Cubemap:
{
LoadCubemap(textureMagFilter, textureMinFilter, bytesPerPixel, width, height, buffer, bitmapBlock,
pixelInternalFormat);
}
break;
case BitmapDataBlock.TypeEnum.Texture3D:
{
LoadTexture2D(textureMagFilter, textureMinFilter, bytesPerPixel, width, height, buffer,
bitmapBlock, pixelInternalFormat);
}
break;
default:
{
GL.DeleteTexture(_handle);
}
break;
}
}
private void LoadPalettedTexture(BitmapDataBlock bitmapBlock, byte[] paletteData, TextureMagFilter textureMagFilter, TextureMinFilter textureMinFilter)
{
if (bitmapBlock.Format != BitmapDataBlock.FormatEnum.P8 &&
bitmapBlock.Format != BitmapDataBlock.FormatEnum.P8bump)
{
return;
}
_textureTarget = TextureTarget.Texture2D;
GL.BindTexture(TextureTarget.Texture2D, _handle);
GL.TexParameter(_textureTarget, TextureParameterName.TextureMagFilter,
( int )textureMagFilter);
GL.TexParameter(_textureTarget, TextureParameterName.TextureMinFilter,
( int )textureMinFilter);
GL.TexParameter(_textureTarget, TextureParameterName.TextureWrapS,
( int )TextureWrapMode.Repeat);
GL.TexParameter(_textureTarget, TextureParameterName.TextureWrapT,
( int )TextureWrapMode.Repeat);
GL.TexStorage2D(( TextureTarget2d )_textureTarget, 1, SizedInternalFormat.Rgba8, bitmapBlock.Width,
bitmapBlock.Height);
var indexData = bitmapBlock.GetResourceData(0);
var texelData = new byte[indexData.Length * 4];
for (var i = 0; i < indexData.Length; ++i)
{
var paletteIndex = indexData[i] * 4;
var texelIndex = i * 4;
texelData[texelIndex + 0] = paletteData[paletteIndex + 0];
texelData[texelIndex + 1] = paletteData[paletteIndex + 1];
texelData[texelIndex + 2] = paletteData[paletteIndex + 2];
texelData[texelIndex + 3] = paletteData[paletteIndex + 3];
}
if (bitmapBlock.BitmapDataFlags.HasFlag(BitmapDataBlock.Flags.Swizzled))
{
texelData = Swizzler.Swizzle(texelData, 4,
bitmapBlock.Width, bitmapBlock.Height);
}
GL.TexSubImage2D(_textureTarget, 0, 0, 0, bitmapBlock.Width, bitmapBlock.Height, PixelFormat.Bgra,
PixelType.UnsignedByte, texelData);
GL.GenerateMipmap(GenerateMipmapTarget.Texture2D);
GL.BindTexture(TextureTarget.Texture2D, 0);
}