/// <summary>
/// Load the texture specified by "tex" with the identifier "textureId".
/// </summary>
public void SetTexture(int textureId, ITexture tex)
{
// Clear loaded texture
if (textureIdToGlTextureHandle.ContainsKey(textureId))
{
GL.DeleteTexture(textureIdToGlTextureHandle[textureId]);
textureIdToGlTextureHandle.Remove(textureId);
}
// Load new texture
if (tex.LevelCount != 0)
{
int texIdx = GL.GenTexture();
GL.BindTexture(TextureTarget.Texture2D, texIdx);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.LinearMipmapLinear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
int textureLevelsToUse = Math.Max(1, tex.LevelCount - 3);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureBaseLevel, 0);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMaxLevel, textureLevelsToUse - 1); // Range is inclusive
for (int level = 0; level < textureLevelsToUse; level++)
{
int dataRowLength = (tex.Width >> level);
byte[] data = tex.DecodeLevelToRGBA8(level, dataRowLength * 4);
GL.PixelStore(PixelStoreParameter.UnpackRowLength, dataRowLength);
GL.TexImage2D(TextureTarget.Texture2D, level, PixelInternalFormat.Rgba, tex.Width >> level, tex.Height >> level,
0, PixelFormat.Rgba, PixelType.UnsignedByte, data);
}
textureIdToGlTextureHandle[textureId] = texIdx;
}
}
