/// <summary>
/// Computes the expected texture size in bytes.
/// </summary>
/// <param name="width">Texture width in pixels. Must be power of 2.</param>
/// <param name="height">Texture height in pixels. Must be power of 2.</param>
/// <param name="format"></param>
/// <param name="mimpaps">Whether the texture has mipmaps.</param>
/// <returns></returns>
public static long ComputeTextureSize(int width, int height,
TextureCompressionFormat format = TextureCompressionFormat.Uncompressed, bool mimpaps = true)
{
if (format != TextureCompressionFormat.Uncompressed && format != TextureCompressionFormat.UncompressedWithAlpha)
{
throw new NotImplementedException("Only uncompressed textures are supported at this time.");
}
if (!MathUtils.IsPowerOfTwo(width) || !MathUtils.IsPowerOfTwo(height))
{
throw new Exception("Image dimensions must by power of 2");
}
int bpp = format.BitsPerPixel();
long size = 0;
while (true)
{
size += width * height * bpp;
if (width == 1 && height == 1)
{
return(size / 8);
}
width = MathUtils.Clamp(width >> 1, 1);
height = MathUtils.Clamp(height >> 1, 1);
}
}
public static long ComputeMipmapSize(int width, int height, int mipLevel,
TextureCompressionFormat format = TextureCompressionFormat.Uncompressed)
{
if (format != TextureCompressionFormat.Uncompressed && format != TextureCompressionFormat.UncompressedWithAlpha)
{
throw new NotImplementedException("Only uncompressed textures are supported at this time.");
}
ComputeMipmapDimensions(width, height, mipLevel, out int mipWidth, out int mipHeight);
return(mipWidth * mipHeight * format.BitsPerPixel());
}