/// <summary>
/// This function load an uncompressed TGA
/// </summary>
static TexttureInfo LoadUncompressedTGA(FileStream file, string name)
{
byte[] header = new byte[6]; // First 6 Useful Bytes From The Header
int bytesPerPixel; // Holds Number Of Bytes Per Pixel Used In The TGA File
int imageSize; // Used To Store The Image Size When Setting Aside Ram
int temp; // Temporary Variable
int type = Gl.GL_RGBA; // Set The Default GL Mode To RBGA (32 BPP)
TexttureInfo info = new TexttureInfo();
if (file == null || file.Read(header, 0, 6) != 6)
//falta la comparacion de memcmp
{
if (file == null)
{
return(info);
}
else
{
file.Close();
return(info);
}
}
texture.width = header[1] * 256 + header[0]; // Determine The TGA Width (highbyte*256+lowbyte)
texture.height = header[3] * 256 + header[2]; // Determine The TGA Height (highbyte*256+lowbyte)
if (texture.width <= 0 || texture.height <= 0 || (header[4] != 24 && header[4] != 32)) // Is The TGA 24 or 32 Bit?
{
file.Close();
return(info);
}
texture.bpp = header[4]; // Grab The TGA's Bits Per Pixel (24 or 32)
bytesPerPixel = texture.bpp / 8; // Divide By 8 To Get The Bytes Per Pixel
imageSize = texture.width * texture.height * bytesPerPixel; // Calculate The Memory Required For The TGA Data
texture.imageData = new byte[imageSize]; // Reserve Memory To Hold The TGA Data
if (imageSize == 0 || file.Read(texture.imageData, 0, imageSize) != imageSize)
{
if (texture.imageData != null)
{
texture.imageData = null;
}
file.Close();
return(info);
}
for (int i = 0; i < imageSize; i += bytesPerPixel) // Loop Through The Image Data
{ // Swaps The 1st And 3rd Bytes ('R'ed and 'B'lue)
temp = texture.imageData[i]; // Temporarily Store The Value At Image Data 'i'
texture.imageData[i] = texture.imageData[i + 2]; // Set The 1st Byte To The Value Of The 3rd Byte
texture.imageData[i + 2] = (byte)temp; // Set The 3rd Byte To The Value In 'temp' (1st Byte Value)
}
file.Close();
// Build A Texture From The Data
int[] textureArray = new int[1];
textureArray[0] = texture.texID;
Gl.glEnable(GL_EXT_TEXTURE_RECTANGLE); //1
Gl.glGenTextures(1, textureArray); //2 Generate OpenGL texture IDs
Gl.glBindTexture(GL_EXT_TEXTURE_RECTANGLE, textureArray[0]); //3 // Bind Our Texture
if (texture.bpp == 24) // Was The TGA 24 Bits
{
type = Gl.GL_RGB; // If So Set The 'type' To GL_RGB
}
Gl.glTexParameteri(GL_EXT_TEXTURE_RECTANGLE, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_LINEAR);
Gl.glTexParameteri(GL_EXT_TEXTURE_RECTANGLE, Gl.GL_TEXTURE_MAG_FILTER, Gl.GL_LINEAR);
Gl.glTexImage2D(GL_EXT_TEXTURE_RECTANGLE, 0, Gl.GL_RGBA, texture.width, texture.height,
0, Gl.GL_RGB8, Gl.GL_UNSIGNED_BYTE, texture.imageData);
//if the texture is intended to be rendered anisotropically
//if (ContentManager.IsAnisotropic(name) && maximumAnisotropy != 0)
//{
// Gl.glTexParameterf(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAX_ANISOTROPY_EXT, maximumAnisotropy); // anisotropic Filtered
//}
//Gl.glTexParameterf(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_LINEAR); // Linear Filtered
//Gl.glTexParameterf(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAG_FILTER, Gl.GL_LINEAR); // Linear Filtered
//Glu.gluBuild2DMipmaps(Gl.GL_TEXTURE_2D, 4, texture.width, texture.height, Gl.GL_RGBA, Gl.GL_UNSIGNED_BYTE, texture.imageData);
//check for NPOT textures
//if (texture.width != texture.height || Math.Log(texture.width, 2) - (int)Math.Log(texture.width, 2) != 0)
//{
// Gl.glTexParameterf(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_LINEAR); // Linear Filtered
// Gl.glTexParameterf(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAG_FILTER, Gl.GL_LINEAR); // Linear Filtered
// Glu.gluBuild2DMipmaps(Gl.GL_TEXTURE_2D, (int)Gl.GL_RGB8, texture.width, texture.height, Gl.GL_RGBA, Gl.GL_UNSIGNED_BYTE, texture.imageData);
//}
//else
//{
// Gl.glTexParameterf(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_LINEAR); // Linear Filtered
// Gl.glTexParameterf(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAG_FILTER, Gl.GL_LINEAR); // Linear Filtered
// Gl.glTexImage2D(Gl.GL_TEXTURE_2D, 0, type, texture.width, texture.height, 0, type, Gl.GL_UNSIGNED_BYTE, texture.imageData);
//}
texture.texID = textureArray[0];
info.ID = texture.texID;
info.height = texture.height;
info.width = texture.width;
return(info);
}
/// <summary>
/// This method performs a low level load of a texture
/// </summary>
static TexttureInfo TextureOne(string s, int i, int[] texture)
{
Bitmap bitmap = new Bitmap(s);
Rectangle rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
BitmapData bitmapData = bitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadOnly,
System.Drawing.Imaging.PixelFormat.Format24bppRgb);
//esto es para asegurar que no se mueva del lugar de memoria el bitmap.
Gl.glBindTexture(Gl.GL_TEXTURE_2D, texture[i]);
Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_LINEAR);
Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAG_FILTER, Gl.GL_LINEAR);
Gl.glTexImage2D(Gl.GL_TEXTURE_2D, 0, Gl.GL_RGBA, bitmap.Width, bitmap.Height,
0, Gl.GL_BGR_EXT, Gl.GL_UNSIGNED_BYTE, bitmapData.Scan0);
//if (ContentManager.IsAnisotropic(s) && maximumAnisotropy > 0)
// Gl.glTexParameterf(GL_EXT_TEXTURE_RECTANGLE, Gl.GL_TEXTURE_MAX_ANISOTROPY_EXT, maximumAnisotropy); // anisotropic Filtered
//else
// EnableFiltering(textFiltering, TexureSize.NPOT);
// Glu.gluBuild2DMipmaps(Gl.GL_TEXTURE_2D, 3, bitmap.Width, bitmap.Height, Gl.GL_BGR_EXT, Gl.GL_UNSIGNED_BYTE, bitmapData.Scan0);
// este codigo es si quiero diferenciar que las texturas NPOT se
//cargen con mimapping y las POT(Power Of Two) normalmente
/*
* if (bitmap.Width != bitmap.Height || Math.Log(bitmap.Width, 2) - (int)Math.Log(bitmap.Width, 2) != 0)
* {
* if (EngineContent.IsAnisotropic(s) && maximumAnisotropy > 0)
* Gl.glTexParameterf(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAX_ANISOTROPY_EXT, maximumAnisotropy); // anisotropic Filtered
* else
* EnableFiltering(textFiltering, TexureSize.NPOT);
*
* Glu.gluBuild2DMipmaps(Gl.GL_TEXTURE_2D, (int)Gl.GL_RGB8, bitmap.Width, bitmap.Height, Gl.GL_BGR_EXT, Gl.GL_UNSIGNED_BYTE, bitmapData.Scan0);
* }
* else
* {
* if (EngineContent.IsAnisotropic(s) && maximumAnisotropy > 0)
* Gl.glTexParameterf(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAX_ANISOTROPY_EXT, maximumAnisotropy); // anisotropic Filtered
* else
* EnableFiltering(textFiltering, TexureSize.POT);
*
* Gl.glTexImage2D(Gl.GL_TEXTURE_2D, 0, 3, bitmap.Width, bitmap.Height, 0, Gl.GL_BGR, Gl.GL_UNSIGNED_BYTE, bitmapData.Scan0);
* }
*/
TexttureInfo info = new TexttureInfo();
info.ID = texture[i];
info.width = bitmap.Width;
info.height = bitmap.Height;
bitmap.UnlockBits(bitmapData);
bitmap.Dispose();
return(info);
}
