GSpan.h

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/****************************************************************************************/
/*  GSpan.h                                                                             */
/*                                                                                      */
/*  Author: John Pollard                                                                */
/*  Description: Front to back span code                                                */
/*                                                                                      */
/*  The contents of this file are subject to the Genesis3D Public License               */
/*  Version 1.01 (the "License"); you may not use this file except in                   */
/*  compliance with the License. You may obtain a copy of the License at                */
/*  http://www.genesis3d.com                                                            */
/*                                                                                      */
/*  Software distributed under the License is distributed on an "AS IS"                 */
/*  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See                */
/*  the License for the specific language governing rights and limitations              */
/*  under the License.                                                                  */
/*                                                                                      */
/*  The Original Code is Genesis3D, released March 25, 1999.                            */
/*  Genesis3D Version 1.1 released November 15, 1999                                 */
/*  Copyright (C) 1999 WildTangent, Inc. All Rights Reserved           */
/*                                                                                      */
/****************************************************************************************/
#ifndef GSPAN
#define GSPAN

#include <Windows.h>

#include "DCommon.h"

#ifdef __cplusplus
extern "C" {
#endif

#define MAX_SPAN_LINES                  1024
#define MAX_SPANS                               35000

typedef struct 
{
        int32   x1;                                                     // Starting x on screen
        int32   x2;                                                     // Ending x on screen
} SPAN;

typedef struct SLIST
{
    uint8                       Used;
    int32                       Min, Max;
    uint32                      Flags;
    struct      SLIST   *Last;
    struct      SLIST   *Next;
} SLIST;

typedef struct
{
        SLIST *First;
        SLIST *Current;
} SPAN_MINMAX;

extern  SPAN    SpanLines[MAX_SPAN_LINES];

extern  SPAN_MINMAX     SMinMax[MAX_SPAN_LINES];                        // Linked list of spans for each scanline...
extern  SLIST   ScanHash[MAX_SPANS];                                    // hash table for SList

extern  int32   NumWorldPixels;
extern  int32   NumSpans;
extern  int32   NumSpanPixels[MAX_SPAN_LINES];
extern  int32   PolysRendered;

void    DRIVERCC EdgeOutNoUV (int32 x1, int32 y1, int32 x2, int32 y2);
void    DRIVERCC AddSpanNoUV(int32 x1, int32 x2, int32 y);

void    ResetSList(void);
SLIST   *NewSList(void);
void    ResetSpans(int32 Rows);

#ifdef __cplusplus
}
#endif

#endif

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