Initial source commit

minorGems/graphics/loadFile.cpp

@@ -0,0 +1,86 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "loadFile.h"
+
+// loads any file into the dest ptr.
+
+
+void loadFile( const char* fileName, long sizeInBytes, unsigned char* byteDestPtr) {
+
+
+	
+	FILE *f;
+	
+	int numBytesRead;
+	
+
+	f = fopen( fileName, "rb");	// open the file
+	
+	// don't load if file failed to open
+	if( f == NULL ) {
+		return;
+		}
+	
+	numBytesRead = fread( (void*)byteDestPtr, sizeof(char), sizeInBytes, f);
+	
+	fclose(f);
+	
+	}
+	
+	
+	
+	
+
+
+// loads a photoshop RAW image file, 32-bit
+
+// NOTE:
+	// This function exists because photoshop swaps the red and blue channels when
+	// it saves a file as raw.  Thus, the file stream doesn't match the way a video
+	// card deals with 32-bit color.
+	
+	// This function loads the file and then swaps the appropriate bytes
+	
+void loadRawFile( const char* fileName, long sizeInBytes, unsigned char* byteDestPtr) {
+
+	//unsigned char tempChannel;
+
+	
+	long byteCount;
+
+	FILE *f;
+	
+	int numBytesRead;
+
+	
+	f = fopen( fileName, "rb");	// open the file
+	
+	// don't load if file failed to open
+	if( f == NULL ) {
+		return;
+		}
+	
+	numBytesRead = fread( (void*)byteDestPtr, sizeof(char), sizeInBytes, f);
+	
+	
+	// now that file read, swap the red and blue channels:
+
+	for( byteCount = 0; byteCount< sizeInBytes; byteCount=byteCount+4) {
+
+		unsigned char alpha = byteDestPtr[byteCount+3];
+		
+		byteDestPtr[byteCount+3] = byteDestPtr[byteCount+2];
+		byteDestPtr[byteCount+2] = byteDestPtr[byteCount+1];
+		byteDestPtr[byteCount+1] = byteDestPtr[byteCount];
+		
+		byteDestPtr[byteCount] = alpha;
+
+/*		tempChannel = byteDestPtr[byteCount];				// currently in red position
+		byteDestPtr[byteCount] = byteDestPtr[byteCount+3];	// currently set to what's in alpha position
+		byteDestPtr[byteCount+2] = tempChannel;
+*/		
+		
+		}
+	
+	fclose(f);
+	}