312 lines
8.8 KiB
C++
312 lines
8.8 KiB
C++
/*
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THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
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END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
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ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
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IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
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SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
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FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
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CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
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AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
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COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
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*/
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/*
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*
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* Editor lighting functions.
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*
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*/
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#include <stdio.h>
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#include "inferno.h"
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#include "segment.h"
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#include "editor.h"
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#include "editor/esegment.h"
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#include "seguvs.h"
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#include "wall.h"
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#include "textures.h"
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#include "maths.h"
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#include "dxxerror.h"
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#include "kdefs.h"
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#include "gameseg.h"
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#include "texmap.h"
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// -----------------------------------------------------------------------------
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// Return light intensity at an instance of a vertex on a side in a segment.
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static fix get_light_intensity(segment *segp, int sidenum, int vert)
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{
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Assert(sidenum <= MAX_SIDES_PER_SEGMENT);
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Assert(vert <= 3);
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return segp->sides[sidenum].uvls[vert].l;
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}
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// -----------------------------------------------------------------------------
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// Set light intensity at a vertex, saturating in .5 to 15.5
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static void set_light_intensity(segment *segp, int sidenum, int vert, fix intensity)
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{
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Assert(sidenum <= MAX_SIDES_PER_SEGMENT);
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Assert(vert <= 3);
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if (intensity < MIN_LIGHTING_VALUE)
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intensity = MIN_LIGHTING_VALUE;
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if (intensity > MAX_LIGHTING_VALUE)
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intensity = MAX_LIGHTING_VALUE;
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segp->sides[sidenum].uvls[vert].l = intensity;
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Update_flags |= UF_WORLD_CHANGED;
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}
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// -----------------------------------------------------------------------------
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// Add light intensity to a vertex, saturating in .5 to 15.5
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static void add_light_intensity(segment *segp, int sidenum, int vert, fix intensity)
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{
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// fix new_intensity;
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set_light_intensity(segp, sidenum, vert, segp->sides[sidenum].uvls[vert].l + intensity);
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}
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// -----------------------------------------------------------------------------
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// Recursively apply light to segments.
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// If current side is a wall, apply light there.
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// If not a wall, apply light to child through that wall.
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// Notes:
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// It is possible to enter a segment twice by taking different paths. It is easy
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// to prevent this by maintaining a list of visited segments, but it is important
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// to reach segments with the greatest light intensity. This can be done by doing
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// a breadth-first-search, or by storing the applied intensity with a visited segment,
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// and if the current intensity is brighter, then apply the difference between it and
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// the previous intensity.
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// Note that it is also possible to visit the original light-casting segment, for example
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// going from segment 0 to 2, then from 2 to 0. This is peculiar and probably not
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// desired, but not entirely invalid. 2 reflects some light back to 0.
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static void apply_light_intensity(segment *segp, int sidenum, fix intensity, int depth)
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{
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int wid_result;
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if (intensity == 0)
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return;
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wid_result = WALL_IS_DOORWAY(segp, sidenum);
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if ((wid_result != WID_FLY_FLAG) && (wid_result != WID_NO_WALL)) {
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int v;
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for (v=0; v<4; v++) // add light to this wall
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add_light_intensity(segp, sidenum, v, intensity);
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return; // we return because there is a wall here, and light does not shine through walls
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}
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// No wall here, so apply light recursively
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if (depth < 3) {
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int s;
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for (s=0; s<MAX_SIDES_PER_SEGMENT; s++)
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apply_light_intensity(&Segments[segp->children[sidenum]], s, intensity/3, depth+1);
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}
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}
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// -----------------------------------------------------------------------------
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// Top level recursive function for applying light.
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// Calls apply_light_intensity.
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// Uses light value on segp:sidenum (tmap_num2 defines light value) and applies
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// the associated intensity to segp. It calls apply_light_intensity to apply intensity/3
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// to all neighbors. apply_light_intensity recursively calls itself to apply light to
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// subsequent neighbors (and forming loops, see above).
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static void propagate_light_intensity(segment *segp, int sidenum)
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{
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int v,s;
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fix intensity;
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short texmap;
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intensity = 0;
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texmap = segp->sides[sidenum].tmap_num;
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intensity += TmapInfo[texmap].lighting;
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texmap = (segp->sides[sidenum].tmap_num2) & 0x3fff;
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intensity += TmapInfo[texmap].lighting;
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if (intensity > 0) {
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for (v=0; v<4; v++)
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add_light_intensity(segp, sidenum, v, intensity);
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// Now, for all sides which are not the same as sidenum (the side casting the light),
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// add a light value to them (if they have no children, ie, they have a wall there).
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for (s=0; s<MAX_SIDES_PER_SEGMENT; s++)
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if (s != sidenum)
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apply_light_intensity(segp, s, intensity/2, 1);
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}
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}
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// -----------------------------------------------------------------------------
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// Highest level function, bound to a key. Apply ambient light to all segments based
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// on user-defined light sources.
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int LightAmbientLighting()
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{
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int seg, side;
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for (seg=0; seg<=Highest_segment_index; seg++)
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for (side=0;side<MAX_SIDES_PER_SEGMENT;side++)
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propagate_light_intensity(&Segments[seg], side);
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return 0;
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}
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// -----------------------------------------------------------------------------
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int LightSelectNextVertex(void)
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{
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Curvert++;
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if (Curvert >= 4)
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Curvert = 0;
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Update_flags |= UF_WORLD_CHANGED;
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return 1;
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}
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// -----------------------------------------------------------------------------
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int LightSelectNextEdge(void)
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{
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Curedge++;
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if (Curedge >= 4)
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Curedge = 0;
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Update_flags |= UF_WORLD_CHANGED;
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return 1;
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}
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// -----------------------------------------------------------------------------
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// Copy intensity from current vertex to all other vertices on side.
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int LightCopyIntensity(void)
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{
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int v,intensity;
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intensity = get_light_intensity(Cursegp, Curside, Curvert);
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for (v=0; v<4; v++)
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if (v != Curvert)
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set_light_intensity(Cursegp, Curside, v, intensity);
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return 1;
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}
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// -----------------------------------------------------------------------------
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// Copy intensity from current vertex to all other vertices on side.
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int LightCopyIntensitySegment(void)
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{
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int s,v,intensity;
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intensity = get_light_intensity(Cursegp, Curside, Curvert);
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for (s=0; s<MAX_SIDES_PER_SEGMENT; s++)
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for (v=0; v<4; v++)
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if ((s != Curside) || (v != Curvert))
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set_light_intensity(Cursegp, s, v, intensity);
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return 1;
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}
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// -----------------------------------------------------------------------------
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int LightDecreaseLightVertex(void)
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{
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set_light_intensity(Cursegp, Curside, Curvert, get_light_intensity(Cursegp, Curside, Curvert)-F1_0/NUM_LIGHTING_LEVELS);
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return 1;
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}
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// -----------------------------------------------------------------------------
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int LightIncreaseLightVertex(void)
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{
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set_light_intensity(Cursegp, Curside, Curvert, get_light_intensity(Cursegp, Curside, Curvert)+F1_0/NUM_LIGHTING_LEVELS);
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return 1;
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}
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// -----------------------------------------------------------------------------
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int LightDecreaseLightSide(void)
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{
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int v;
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for (v=0; v<4; v++)
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set_light_intensity(Cursegp, Curside, v, get_light_intensity(Cursegp, Curside, v)-F1_0/NUM_LIGHTING_LEVELS);
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return 1;
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}
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// -----------------------------------------------------------------------------
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int LightIncreaseLightSide(void)
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{
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int v;
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for (v=0; v<4; v++)
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set_light_intensity(Cursegp, Curside, v, get_light_intensity(Cursegp, Curside, v)+F1_0/NUM_LIGHTING_LEVELS);
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return 1;
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}
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// -----------------------------------------------------------------------------
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int LightDecreaseLightSegment(void)
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{
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int s,v;
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for (s=0; s<MAX_SIDES_PER_SEGMENT; s++)
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for (v=0; v<4; v++)
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set_light_intensity(Cursegp, s, v, get_light_intensity(Cursegp, s, v)-F1_0/NUM_LIGHTING_LEVELS);
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return 1;
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}
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// -----------------------------------------------------------------------------
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int LightIncreaseLightSegment(void)
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{
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int s,v;
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for (s=0; s<MAX_SIDES_PER_SEGMENT; s++)
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for (v=0; v<4; v++)
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set_light_intensity(Cursegp, s, v, get_light_intensity(Cursegp, s, v)+F1_0/NUM_LIGHTING_LEVELS);
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return 1;
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}
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// -----------------------------------------------------------------------------
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int LightSetDefault(void)
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{
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int v;
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for (v=0; v<4; v++)
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set_light_intensity(Cursegp, Curside, v, DEFAULT_LIGHTING);
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return 1;
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}
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// -----------------------------------------------------------------------------
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int LightSetMaximum(void)
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{
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int v;
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for (v=0; v<4; v++)
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set_light_intensity(Cursegp, Curside, v, (NUM_LIGHTING_LEVELS-1)*F1_0/NUM_LIGHTING_LEVELS);
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return 1;
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}
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// -----------------------------------------------------------------------------
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int LightSetDefaultAll(void)
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{
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assign_default_lighting_all();
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Update_flags |= UF_WORLD_CHANGED;
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return 1;
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}
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