Initial commit

application/source/engine/resourceManager.c

@@ -0,0 +1,112 @@
+
+
+#include "texture2D.h"
+
+#include <png.h>
+
+#include "stdbool.h"
+
+#include "string.h"
+
+class resourceManager{
+	
+	texture2D * loadPngImage( char * name ) {
+
+		texture2D * texture 	= new texture2D();
+
+		png_structp 	png_ptr;
+
+		png_infop 		info_ptr;
+
+		unsigned int 	sig_read = 0;
+
+		int 			color_type;
+
+		int 			interlace_type;
+
+		FILE *			fp;
+
+		if ( ( fp = fopen( name, "rb" ) ) == NULL ) {
+
+		    return NULL;
+
+		}
+
+		png_ptr 	= png_create_read_struct( PNG_LIBPNG_VER_STRING, NULL, NULL, NULL );
+
+		if ( png_ptr == NULL ) {
+
+		    fclose( fp );
+
+		    return false;
+
+		}
+
+		info_ptr 	= png_create_info_struct( png_ptr );
+
+		if ( info_ptr == NULL ) {
+
+		    fclose(fp);
+
+		    png_destroy_read_struct( &png_ptr, NULL, NULL );
+
+		    return false;
+
+		}
+
+		if ( setjmp( png_jmpbuf( png_ptr ) ) ) {
+
+		    png_destroy_read_struct( &png_ptr, &info_ptr, NULL );
+
+		    fclose( fp );
+
+		    return false;
+
+		}
+
+		png_init_io( png_ptr, fp );
+
+		png_set_sig_bytes( png_ptr, sig_read );
+
+		png_read_png( png_ptr, info_ptr, PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_PACKING | PNG_TRANSFORM_EXPAND, NULL );
+
+		png_uint_32 width, height;
+
+		int bit_depth;
+
+		png_get_IHDR( png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, NULL, NULL );
+
+		unsigned int row_bytes 		= png_get_rowbytes( png_ptr, info_ptr );
+
+
+
+		texture->width 				= width;
+
+		texture->height 			= height;
+
+		texture->hasAlpha			= ( color_type == PNG_COLOR_TYPE_RGBA );
+
+		texture->data 				= ( unsigned char * ) malloc( row_bytes * texture->height );
+
+
+		png_bytepp row_pointers 	= png_get_rows( png_ptr, info_ptr );
+
+		for (int i = 0; i < texture->height; i++) {
+
+		    // note that png is ordered top to
+		    // bottom, but OpenGL expect it bottom to top
+		    // so the order or swapped
+
+		    memcpy( texture->data + ( row_bytes * ( texture->height - 1 - i ) ), row_pointers[ i ], row_bytes );
+
+		}
+
+		png_destroy_read_struct( &png_ptr, &info_ptr, NULL );
+
+		fclose( fp );
+
+		return texture;
+
+	}
+
+}