/*
 * Mesa 3-D graphics library
 * Version:  3.3
 * 
 * Copyright (C) 1999-2000  Brian Paul   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
 * BRIAN PAUL 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.
 */


#ifndef ALPHABUF_H
#define ALPHABUF_H


#include "types.h"


extern void
_mesa_alloc_alpha_buffers( GLcontext *ctx );


extern void
_mesa_clear_alpha_buffers( GLcontext *ctx );


extern void
_mesa_write_alpha_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
                        CONST GLubyte rgba[][4], const GLubyte mask[] );


extern void
_mesa_write_mono_alpha_span( GLcontext *ctx,
                             GLuint n, GLint x, GLint y,
                             GLubyte alpha, const GLubyte mask[] );



extern void
_mesa_write_alpha_pixels( GLcontext* ctx,
                          GLuint n, const GLint x[], const GLint y[],
                          CONST GLubyte rgba[][4],
                          const GLubyte mask[] );


extern void
_mesa_write_mono_alpha_pixels( GLcontext* ctx,
                               GLuint n, const GLint x[],
                               const GLint y[], GLubyte alpha,
                               const GLubyte mask[] );


extern void
_mesa_read_alpha_span( GLcontext* ctx,
                       GLuint n, GLint x, GLint y, GLubyte rgba[][4] );


extern void
_mesa_read_alpha_pixels( GLcontext* ctx,
                         GLuint n, const GLint x[], const GLint y[],
                         GLubyte rgba[][4], const GLubyte mask[] );


#endif