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72 lines
2.5 KiB
C
72 lines
2.5 KiB
C
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//
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// Copyright (C) 1993-1996 by id Software, Inc.
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//
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// This source is available for distribution and/or modification
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// only under the terms of the DOOM Source Code License as
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// published by id Software. All rights reserved.
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//
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// The source is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
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// for more details.
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//
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#pragma once
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#include <stddef.h>
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#include "r_defs.h"
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#include "v_palette.h"
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#include "r_data/colormaps.h"
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#include "r_utility.h"
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// Lighting.
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//
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// [RH] This has changed significantly from Doom, which used lookup
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// tables based on 1/z for walls and z for flats and only recognized
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// 16 discrete light levels. The terminology I use is borrowed from Build.
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// The size of a single colormap, in bits
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#define COLORMAPSHIFT 8
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// Convert a light level into an unbounded colormap index (shade). Result is
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// fixed point. Why the +12? I wish I knew, but experimentation indicates it
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// is necessary in order to best reproduce Doom's original lighting.
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#define LIGHT2SHADE(l) ((NUMCOLORMAPS*2*FRACUNIT)-(((l)+12)*(FRACUNIT*NUMCOLORMAPS/128)))
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// MAXLIGHTSCALE from original DOOM, divided by 2.
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#define MAXLIGHTVIS (24.0)
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// Convert a shade and visibility to a clamped colormap index.
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// Result is not fixed point.
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// Change R_CalcTiltedLighting() when this changes.
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#define GETPALOOKUP(vis,shade) (clamp<int> (((shade)-FLOAT2FIXED(MIN(MAXLIGHTVIS,double(vis))))>>FRACBITS, 0, NUMCOLORMAPS-1))
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// Calculate the light multiplier for dc_light/ds_light
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// This is used instead of GETPALOOKUP when ds_colormap/dc_colormap is set to the base colormap
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// Returns a value between 0 and 1 in fixed point
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#define LIGHTSCALE(vis,shade) FLOAT2FIXED(clamp((FIXED2DBL(shade) - (MIN(MAXLIGHTVIS,double(vis)))) / NUMCOLORMAPS, 0.0, (NUMCOLORMAPS-1)/(double)NUMCOLORMAPS))
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// Converts fixedlightlev into a shade value
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#define FIXEDLIGHT2SHADE(lightlev) (((lightlev) >> COLORMAPSHIFT) << FRACBITS)
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namespace swrenderer
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{
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extern double r_BaseVisibility;
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extern double r_WallVisibility;
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extern double r_FloorVisibility;
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extern float r_TiltVisibility;
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extern double r_SpriteVisibility;
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extern int r_actualextralight;
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extern bool foggy;
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extern int fixedlightlev;
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extern FSWColormap *fixedcolormap;
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extern FSpecialColormap *realfixedcolormap;
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extern FDynamicColormap *basecolormap; // [RH] Colormap for sector currently being drawn
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void R_SetVisibility(double visibility);
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double R_GetVisibility();
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void R_SetupColormap(player_t *);
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}
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