/* $Id: pb.h,v 1.2 1999/09/18 20:41:23 keithw Exp $ */

/*
 * Mesa 3-D graphics library
 * Version:  3.1
 * 
 * Copyright (C) 1999  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 PB_H
#define PB_H


#include "types.h"



/*
 * Pixel buffer size, must be larger than MAX_WIDTH.
 */
#define PB_SIZE (3*MAX_WIDTH)


struct pixel_buffer {
	GLint x[PB_SIZE];         /* X window coord in [0,MAX_WIDTH) */
	GLint y[PB_SIZE];         /* Y window coord in [0,MAX_HEIGHT) */
	GLdepth z[PB_SIZE];       /* Z window coord in [0,MAX_DEPTH] */
	GLubyte rgba[PB_SIZE][4]; /* Colors */
	GLubyte spec[PB_SIZE][3]; /* Separate specular colors */
	GLuint i[PB_SIZE];        /* Index */
	GLfloat s[MAX_TEXTURE_UNITS][PB_SIZE];	/* Texture S coordinates */
	GLfloat t[MAX_TEXTURE_UNITS][PB_SIZE];	/* Texture T coordinates */
	GLfloat u[MAX_TEXTURE_UNITS][PB_SIZE];	/* Texture R coordinates */
	GLfloat lambda[MAX_TEXTURE_UNITS][PB_SIZE];/* Texture lambda values */
	GLint color[4];		/* Mono color, integers! */
	GLuint index;		/* Mono index */
	GLuint count;		/* Number of pixels in buffer */
	GLboolean mono;		/* Same color or index for all pixels? */
	GLenum primitive;	/* GL_POINT, GL_LINE, GL_POLYGON or GL_BITMAP*/
};





/*
 * Set the color used for all subsequent pixels in the buffer.
 */
#define PB_SET_COLOR( CTX, PB, R, G, B, A )			\
	if ((PB)->color[RCOMP]!=(R) || (PB)->color[GCOMP]!=(G)	\
	 || (PB)->color[BCOMP]!=(B) || (PB)->color[ACOMP]!=(A)	\
	 || !(PB)->mono) {					\
		gl_flush_pb( ctx );				\
	}								\
	(PB)->color[RCOMP] = R;					\
	(PB)->color[GCOMP] = G;					\
	(PB)->color[BCOMP] = B;					\
	(PB)->color[ACOMP] = A;					\
	(PB)->mono = GL_TRUE;


/*
 * Set the color index used for all subsequent pixels in the buffer.
 */
#define PB_SET_INDEX( CTX, PB, I )		\
	if ((PB)->index!=(I) || !(PB)->mono) {	\
		gl_flush_pb( CTX );		\
	}					\
	(PB)->index = I;			\
	(PB)->mono = GL_TRUE;


/*
 * "write" a pixel using current color or index
 */
#define PB_WRITE_PIXEL( PB, X, Y, Z )		\
	(PB)->x[(PB)->count] = X;		\
	(PB)->y[(PB)->count] = Y;		\
	(PB)->z[(PB)->count] = Z;		\
	(PB)->count++;


/*
 * "write" an RGBA pixel
 */
#define PB_WRITE_RGBA_PIXEL( PB, X, Y, Z, R, G, B, A )	\
	(PB)->x[(PB)->count] = X;			\
	(PB)->y[(PB)->count] = Y;			\
	(PB)->z[(PB)->count] = Z;			\
	(PB)->rgba[(PB)->count][RCOMP] = R;		\
	(PB)->rgba[(PB)->count][GCOMP] = G;		\
	(PB)->rgba[(PB)->count][BCOMP] = B;		\
	(PB)->rgba[(PB)->count][ACOMP] = A;		\
	(PB)->count++;

/*
 * "write" a color-index pixel
 */
#define PB_WRITE_CI_PIXEL( PB, X, Y, Z, I )	\
	(PB)->x[(PB)->count] = X;		\
	(PB)->y[(PB)->count] = Y;		\
	(PB)->z[(PB)->count] = Z;		\
	(PB)->i[(PB)->count] = I;		\
	(PB)->count++;


/*
 * "write" an RGBA pixel with texture coordinates
 */
#define PB_WRITE_TEX_PIXEL( PB, X, Y, Z, R, G, B, A, S, T, U )	\
	(PB)->x[(PB)->count] = X;				\
	(PB)->y[(PB)->count] = Y;				\
	(PB)->z[(PB)->count] = Z;				\
	(PB)->rgba[(PB)->count][RCOMP] = R;			\
	(PB)->rgba[(PB)->count][GCOMP] = G;			\
	(PB)->rgba[(PB)->count][BCOMP] = B;			\
	(PB)->rgba[(PB)->count][ACOMP] = A;			\
	(PB)->s[0][(PB)->count] = S;				\
	(PB)->t[0][(PB)->count] = T;				\
	(PB)->u[0][(PB)->count] = U;				\
	(PB)->count++;

/*
 * "write" an RGBA pixel with multiple texture coordinates
 */
#define PB_WRITE_MULTITEX_PIXEL( PB, X, Y, Z, R, G, B, A, S, T, U, S1, T1, U1 )	\
	(PB)->x[(PB)->count] = X;				\
	(PB)->y[(PB)->count] = Y;				\
	(PB)->z[(PB)->count] = Z;				\
	(PB)->rgba[(PB)->count][RCOMP] = R;			\
	(PB)->rgba[(PB)->count][GCOMP] = G;			\
	(PB)->rgba[(PB)->count][BCOMP] = B;			\
	(PB)->rgba[(PB)->count][ACOMP] = A;			\
	(PB)->s[0][(PB)->count] = S;				\
	(PB)->t[0][(PB)->count] = T;				\
	(PB)->u[0][(PB)->count] = U;				\
	(PB)->s[1][(PB)->count] = S1;				\
	(PB)->t[1][(PB)->count] = T1;				\
	(PB)->u[1][(PB)->count] = U1;				\
	(PB)->count++;

/*
 * "write" an RGBA pixel with multiple texture coordinates and specular color
 */
#define PB_WRITE_MULTITEX_SPEC_PIXEL( PB, X, Y, Z, R, G, B, A,	\
			SR, SG, SB, S, T, U, S1, T1, U1 )	\
	(PB)->x[(PB)->count] = X;				\
	(PB)->y[(PB)->count] = Y;				\
	(PB)->z[(PB)->count] = Z;				\
	(PB)->rgba[(PB)->count][RCOMP] = R;			\
	(PB)->rgba[(PB)->count][GCOMP] = G;			\
	(PB)->rgba[(PB)->count][BCOMP] = B;			\
	(PB)->rgba[(PB)->count][ACOMP] = A;			\
	(PB)->spec[(PB)->count][RCOMP] = SR;			\
	(PB)->spec[(PB)->count][GCOMP] = SG;			\
	(PB)->spec[(PB)->count][BCOMP] = SB;			\
	(PB)->s[0][(PB)->count] = S;				\
	(PB)->t[0][(PB)->count] = T;				\
	(PB)->u[0][(PB)->count] = U;				\
	(PB)->s[1][(PB)->count] = S1;				\
	(PB)->t[1][(PB)->count] = T1;				\
	(PB)->u[1][(PB)->count] = U1;				\
	(PB)->count++;



/*
 * Call this function at least every MAX_WIDTH pixels:
 */
#define PB_CHECK_FLUSH( CTX, PB )		\
do {						\
	if ((PB)->count>=PB_SIZE-MAX_WIDTH) {	\
	   gl_flush_pb( CTX );			\
	}					\
} while(0)

extern struct pixel_buffer *gl_alloc_pb(void);

extern void gl_flush_pb( GLcontext *ctx );

#endif