/*****************************************************************************/
/* D2K: A Doom Source Port for the 21st Century                              */
/*                                                                           */
/* Copyright (C) 2014: See COPYRIGHT file                                    */
/*                                                                           */
/* This file is part of D2K.                                                 */
/*                                                                           */
/* D2K is free software: you can redistribute it and/or modify it under the  */
/* terms of the GNU General Public License as published by the Free Software */
/* Foundation, either version 2 of the License, or (at your option) any      */
/* later version.                                                            */
/*                                                                           */
/* D2K is distributed in the hope that it will be useful, but WITHOUT ANY    */
/* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS */
/* FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more    */
/* details.                                                                  */
/*                                                                           */
/* You should have received a copy of the GNU General Public License along   */
/* with D2K.  If not, see <http://www.gnu.org/licenses/>.                    */
/*                                                                           */
/*****************************************************************************/


#ifndef R_DRAW_H__
#define R_DRAW_H__

#include "r_defs.h"

#ifdef __GNUG__
#pragma interface
#endif

enum column_pipeline_e {
  RDC_PIPELINE_STANDARD,
  RDC_PIPELINE_TRANSLUCENT,
  RDC_PIPELINE_TRANSLATED,
  RDC_PIPELINE_FUZZ,
  RDC_PIPELINE_MAXPIPELINES,
};

// Used to specify what kind of filering you want
enum draw_filter_type_e {
  RDRAW_FILTER_NONE,
  RDRAW_FILTER_POINT,
  RDRAW_FILTER_LINEAR,
  RDRAW_FILTER_ROUNDED,
  RDRAW_FILTER_MAXFILTERS
};

// Used to specify what kind of column edge rendering to use on masked 
// columns. SQUARE = standard, SLOPED = slope the column edge up or down
// based on neighboring columns
enum sloped_edge_type_e {
  RDRAW_MASKEDCOLUMNEDGE_SQUARE,
  RDRAW_MASKEDCOLUMNEDGE_SLOPED
};

typedef enum
{
  DRAW_COLUMN_ISPATCH = 0x00000001
} draw_column_flags_e;

typedef struct draw_column_vars_s* pdraw_column_vars_s;
typedef void (*R_DrawColumn_f)(pdraw_column_vars_s dcvars);

// Packaged into a struct - POPE
typedef struct draw_column_vars_s
{
  int                 x;
  int                 yl;
  int                 yh;
  int                 dy;
  fixed_t             z; // the current column z coord
  fixed_t             iscale;
  fixed_t             texturemid;
  int                 texheight;    // killough
  fixed_t             texu; // the current column u coord
  const byte          *source; // first pixel in a column
  const byte          *prevsource; // first pixel in previous column
  const byte          *nextsource; // first pixel in next column
  const lighttable_t  *colormap;
  const lighttable_t  *nextcolormap;
  const byte          *translation;
  int                 edgeslope; // OR'ed RDRAW_EDGESLOPE_*
  // 1 if R_DrawColumn* is currently drawing a masked column, otherwise 0
  int                 drawingmasked;
  enum sloped_edge_type_e edgetype;
  unsigned int        flags; //e6y: for detect patches ind colfunc()
  R_DrawColumn_f      colfunc;
} draw_column_vars_t;

void R_SetDefaultDrawColumnVars(draw_column_vars_t *dcvars);

void R_VideoErase(int x, int y, int count);

typedef struct {
  int                 y;
  int                 x1;
  int                 x2;
  fixed_t             z; // the current span z coord
  fixed_t             xfrac;
  fixed_t             yfrac;
  fixed_t             xstep;
  fixed_t             ystep;
  const byte          *source; // start of a 64*64 tile image
  const lighttable_t  *colormap;
  const lighttable_t  *nextcolormap;
} draw_span_vars_t;

typedef struct {
  byte           *byte_topleft;
  unsigned int   *int_topleft;
  int   byte_pitch;
  int   int_pitch;

  enum draw_filter_type_e filterwall;
  enum draw_filter_type_e filterfloor;
  enum draw_filter_type_e filtersprite;
  enum draw_filter_type_e filterz;
  enum draw_filter_type_e filterpatch;

  enum sloped_edge_type_e sprite_edges;
  enum sloped_edge_type_e patch_edges;

  // Used to specify an early-out magnification threshold for filtering.
  // If a texture is being minified (dcvars.iscale > rdraw_magThresh), then it
  // drops back to point filtering.
  fixed_t mag_threshold;
} draw_vars_t;

extern draw_vars_t drawvars;

extern byte playernumtotrans[MAXPLAYERS]; // CPhipps - what translation table for what player
extern byte       *translationtables;

R_DrawColumn_f R_GetDrawColumnFunc(enum column_pipeline_e type,
                                   enum draw_filter_type_e filter,
                                   enum draw_filter_type_e filterz);

// Span blitting for rows, floor/ceiling. No Spectre effect needed.
typedef void (*R_DrawSpan_f)(draw_span_vars_t *dsvars);
R_DrawSpan_f R_GetDrawSpanFunc(enum draw_filter_type_e filter,
                               enum draw_filter_type_e filterz);
void R_DrawSpan(draw_span_vars_t *dsvars);

void R_InitBuffer(int width, int height);

void R_InitBuffersRes(void);

// Initialize color translation tables, for player rendering etc.
void R_InitTranslationTables(void);

// Rendering function.
void R_FillBackScreen(void);

// If the view size is not full screen, draws a border around it.
void R_DrawViewBorder(void);

// haleyjd 09/13/04: new function to call from main rendering loop
// which gets rid of the unnecessary reset of various variables during
// column drawing.
void R_ResetColumnBuffer(void);

#endif

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