// BEGIN_COPYRIGHT
// 
// Copyright (C) 1999  Allen Akin   All Rights Reserved.
// 
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the
// Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
// KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL ALLEN AKIN BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
// AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
// OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
// 
// END_COPYRIGHT




// OpenGL utility routines for images

#include "image.h"

namespace GLEAN {


///////////////////////////////////////////////////////////////////////////////
// draw - draw image using glDrawPixels
///////////////////////////////////////////////////////////////////////////////
void
Image::draw() {
	glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
	glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
	glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
	glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
	glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
	glPixelStorei(GL_UNPACK_ALIGNMENT, alignment());
	glDrawPixels(width(), height(), format(), type(), pixels());
} // Image::draw

///////////////////////////////////////////////////////////////////////////////
// read - read image using glReadPixels
///////////////////////////////////////////////////////////////////////////////
void
Image::read(GLint x, GLint y) {
	glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
	glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
	glPixelStorei(GL_PACK_ROW_LENGTH, 0);
	glPixelStorei(GL_PACK_SKIP_ROWS, 0);
	glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
	glPixelStorei(GL_PACK_ALIGNMENT, alignment());
	glReadPixels(x, y, width(), height(), format(), type(), pixels());
} // Image::read

///////////////////////////////////////////////////////////////////////////////
// makeMipmaps - generate and load mipmaps for texturing
///////////////////////////////////////////////////////////////////////////////
void
Image::makeMipmaps(GLenum internalFormat) {
	glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
	glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
	glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
	glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
	glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
	glPixelStorei(GL_UNPACK_ALIGNMENT, alignment());
	gluBuild2DMipmaps(GL_TEXTURE_2D, internalFormat, width(), height(),
		format(), type(), pixels());
} // Image::makeMipmaps

}; // namespace GLEAN