Initial revision

git-svn-id: svn://svn.icculus.org/blackshades/trunk@2 5198baeb-e213-0410-be47-fc2ff85ca46f

1 files changed, 83 insertions, 0 deletions

diff --git a/Source/TGALoader.cpp b/Source/TGALoader.cpp
new file mode 100644
index 0000000..b3ec161
--- /dev/null
+++ b/Source/TGALoader.cpp
@@ -0,0 +1,83 @@
+/**> HEADER FILES <**/
+#include "TGALoader.h"
+
+
+/********************> LoadTGA() <*****/
+TGAImageRec*	LoadTGA( char *filename )
+{    
+	GLubyte			TGAheader[12]={0,0,2,0,0,0,0,0,0,0,0,0};	// Uncompressed TGA Header
+	GLubyte			TGAcompare[12];								// Used To Compare TGA Header
+	GLubyte			header[6];									// First 6 Useful Bytes From The Header
+	GLuint			bytesPerPixel;								// Holds Number Of Bytes Per Pixel Used In The TGA File
+	GLuint			imageSize;									// Used To Store The Image Size When Setting Aside Ram
+	GLuint			temp;										// Temporary Variable
+	GLuint			type = GL_RGBA;								// Set The Default GL Mode To RBGA (32 BPP)
+	TGAImageRec		*texture;
+	FILE			*file;
+	
+	// Open The TGA File
+	file = fopen( filename, "rb" );
+
+	if( ( file == NULL ) ||	// Does File Even Exist?
+		( fread( TGAcompare, 1, sizeof( TGAcompare ), file ) != sizeof( TGAcompare ) ) ||	// Are There 12 Bytes To Read?
+		( memcmp( TGAheader, TGAcompare, sizeof( TGAheader ) ) != 0 ) ||	// Does The Header Match What We Want?
+		( fread( header, 1, sizeof( header ), file ) != sizeof( header ) ) )// If So Read Next 6 Header Bytes
+	{
+		// If anything failed then close the file and return false
+		fclose( file );
+		return NULL;
+	}
+	
+	// Create a new RGBAImageRec
+	texture = ( TGAImageRec* )malloc( sizeof( TGAImageRec ) );
+	
+	// Determine the TGA width (highbyte*256+lowbyte) and height (highbyte*256+lowbyte)
+	texture->sizeX  = header[1] * 256 + header[0];
+	texture->sizeY = header[3] * 256 + header[2];
+    
+    // Make sure the height, width, and bit depth are valid
+ 	if(	( texture->sizeX <= 0 ) || ( texture->sizeY <= 0 ) || ( ( header[4] != 24 ) && ( header[4] != 32 ) ) )
+	{
+		// If anything failed then close the file, free up memory for the image, and return NULL
+		fclose( file );
+		free( texture );
+		return NULL;
+	}
+	
+	// Grab The TGA's Bits Per Pixel (24 or 32)
+	texture->bpp = header[4];							
+	bytesPerPixel = texture->bpp/8;	// Divide By 8 To Get The Bytes Per Pixel
+	
+	// Calculate The Memory Required For The TGA Data
+	imageSize = texture->sizeX * texture->sizeY * bytesPerPixel;
+	
+	// Reserve Memory To Hold The TGA Data
+	texture->data = ( GLubyte* )malloc( imageSize );		
+	
+	// Make sure the right amount of memory was allocated
+	if(	( texture->data == NULL ) || ( fread( texture->data, 1, imageSize, file ) != imageSize ) )
+	{
+		// Free up the image data if there was any
+		if( texture->data != NULL )
+			free( texture->data );
+
+		// If anything failed then close the file, free up memory for the image, and return NULL
+		fclose( file );
+		free( texture );
+		return NULL;
+	}
+	
+	// Loop Through The Image Data
+	for( GLuint i = 0; i < int( imageSize ); i += bytesPerPixel )
+	{
+		// Swaps The 1st And 3rd Bytes ('R'ed and 'B'lue)
+		temp = texture->data[i];					// Temporarily Store The Value At Image Data 'i'
+		texture->data[i] = texture->data[i + 2];	// Set The 1st Byte To The Value Of The 3rd Byte
+		texture->data[i + 2] = temp;				// Set The 3rd Byte To The Value In 'temp' (1st Byte Value)
+	}
+	
+	// Close The File
+	fclose( file );
+	
+	return texture;
+}