Lucas GAUTHERON
8c084668cb
git-svn-id: svn://svn.code.sf.net/p/actiongame/code/trunk/ac@7020 e016b1c5-ed68-44aa-a2f7-31cac88cffde
459 lines
13 KiB
C++
459 lines
13 KiB
C++
// shadow.cpp: stencil shadow rendering
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#include "cube.h"
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VARP(stencilshadow, 0, 40, 100);
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int stenciling = 0;
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VAR(shadowclip, 0, 1, 1);
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VAR(shadowtile, 0, 1, 1);
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const int dbgtiles = 0;
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//VAR(dbgtiles, 0, 0, 1);
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VAR(shadowcasters, 1, 0, 0);
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#define SHADOWROWS 64
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#define SHADOWCOLUMNS 32
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#define SHADOWCOLUMNMASK (0xFFFFFFFFU>>(32-SHADOWCOLUMNS))
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uint shadowtiles[SHADOWROWS+1];
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float shadowx1 = 1, shadowy1 = 1, shadowx2 = -1, shadowy2 = -1;
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static void extrudeshadowtiles(int x1, int y1, int x2, int y2, int x3, int y3)
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{
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if(y1 > y2) { swap(x1, x2); swap(y1, y2); }
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if(y2 > y3) { swap(x2, x3); swap(y2, y3); }
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if(y1 > y2) { swap(x1, x2); swap(y1, y2); }
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if(y3 < 0 || y1 >= SHADOWROWS) return;
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int lx = x1, rx = x1,
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fracl = 0, fracr = 0,
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dlx, dly, drx, dry;
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if(x2 <= x3) { dlx = x2; dly = y2; drx = x3; dry = y3; }
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else { dlx = x3; dly = y3; drx = x2; dry = y2; }
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dlx -= x1; dly -= y1;
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drx -= x1; dry -= y1;
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int ldir = 1, rdir = 1;
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if(dlx < 0)
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{
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ldir = -1;
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dlx = -dlx;
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}
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if(drx < 0)
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{
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rdir = -1;
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drx = -drx;
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}
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int cy = y1;
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y2 = min(y2, SHADOWROWS);
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if(cy < 0 && y2 > cy)
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{
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int dy = min(y2, 0) - cy;
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cy += dy;
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fracl += dy*dlx;
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lx += ldir*(fracl/dly);
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fracl %= dly;
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fracr += dy*drx;
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rx += rdir*(fracr/dry);
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fracr %= dry;
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}
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for(; cy < y2; cy++)
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{
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int cx1 = lx, cx2 = rx;
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fracl += dlx;
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while(fracl >= dly) { lx += ldir; if(ldir < 0) cx1 = lx; fracl -= dly; }
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fracr += drx;
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while(fracr >= dry) { rx += rdir; if(rdir > 0) cx2 = rx; fracr -= dry; }
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if(cx1 < SHADOWCOLUMNS && cx2 >= 0) shadowtiles[cy] |= (SHADOWCOLUMNMASK>>(SHADOWCOLUMNS - (min(cx2, SHADOWCOLUMNS-1)+1))) & (SHADOWCOLUMNMASK<<max(cx1, 0));
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}
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if(cy >= SHADOWROWS) return;
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if(x2 < x3 || y1 == cy)
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{
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if(x2 < lx) lx = x2;
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dlx = x3 - lx; dly = y3 - cy;
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ldir = 1;
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if(dlx < 0)
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{
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ldir = -1;
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dlx = -dlx;
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}
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fracl = 0;
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}
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if(x2 > x3 || y1 == cy)
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{
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if(x2 > rx) rx = x2;
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drx = x3 - rx; dry = y3 - cy;
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rdir = 1;
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if(drx < 0)
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{
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rdir = -1;
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drx = -drx;
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}
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fracr = 0;
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}
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y3 = min(y3, SHADOWROWS);
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if(cy < 0 && y3 > cy)
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{
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int dy = min(y3, 0) - cy;
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cy += dy;
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fracl += dy*dlx;
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lx += ldir*(fracl/dly);
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fracl %= dly;
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fracr += dy*drx;
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rx += rdir*(fracr/dry);
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fracr %= dry;
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}
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for(; cy < y3; cy++)
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{
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int cx1 = lx, cx2 = rx;
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fracl += dlx;
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while(fracl >= dly) { lx += ldir; if(ldir < 0) cx1 = lx; fracl -= dly; }
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fracr += drx;
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while(fracr >= dry) { rx += rdir; if(rdir > 0) cx2 = rx; fracr -= dry; }
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if(cx1 < SHADOWCOLUMNS && cx2 >= 0) shadowtiles[cy] |= (SHADOWCOLUMNMASK>>(SHADOWCOLUMNS - (min(cx2, SHADOWCOLUMNS-1)+1))) & (SHADOWCOLUMNMASK<<max(cx1, 0));
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}
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if(cy < SHADOWROWS)
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{
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int cx1 = lx, cx2 = rx;
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if(dly)
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{
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fracl += dlx;
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while(fracl >= dly) { lx += ldir; if(ldir < 0) cx1 = lx; fracl -= dly; }
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}
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if(dry)
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{
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fracr += drx;
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while(fracr >= dry) { rx += rdir; if(rdir > 0) cx2 = rx; fracr -= dry; }
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}
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if(cx1 < SHADOWCOLUMNS && cx2 >= 0) shadowtiles[cy] |= (SHADOWCOLUMNMASK>>(SHADOWCOLUMNS - (min(cx2, SHADOWCOLUMNS-1)+1))) & (SHADOWCOLUMNMASK<<max(cx1, 0));
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}
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}
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static void addshadowtiles(float x1, float y1, float x2, float y2)
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{
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shadowx1 = min(shadowx1, x1);
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shadowy1 = min(shadowy1, y1);
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shadowx2 = max(shadowx2, x2);
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shadowy2 = max(shadowy2, y2);
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int tx1 = clamp(int(floor((y1 + 1)/2 * SHADOWCOLUMNS)), 0, SHADOWCOLUMNS - 1),
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ty1 = clamp(int(floor((x1 + 1)/2 * SHADOWROWS)), 0, SHADOWROWS - 1),
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tx2 = clamp(int(floor((y2 + 1)/2 * SHADOWCOLUMNS)), 0, SHADOWCOLUMNS - 1),
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ty2 = clamp(int(floor((x2 + 1)/2 * SHADOWROWS)), 0, SHADOWROWS - 1);
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uint mask = (SHADOWCOLUMNMASK>>(SHADOWCOLUMNS - (tx2+1))) & (SHADOWCOLUMNMASK<<tx1);
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for(int y = ty1; y <= ty2; y++) shadowtiles[y] |= mask;
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}
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bool addshadowbox(const vec &bbmin, const vec &bbmax, const vec &extrude, const glmatrixf &mat)
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{
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vec4 v[8];
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float sx1 = 1e16f, sy1 = 1e16f, sx2 = -1e16f, sy2 = -1e16f;
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int front = 0;
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loopi(8)
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{
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vec4 &p = v[i];
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mat.transform(vec(i&1 ? bbmax.x : bbmin.x, i&2 ? bbmax.y : bbmin.y, i&4 ? bbmax.z : bbmin.z), p);
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if(p.z >= -p.w)
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{
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float x = p.x / p.w, y = p.y / p.w;
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sx1 = min(sx1, x);
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sy1 = min(sy1, y);
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sx2 = max(sx2, x);
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sy2 = max(sy2, y);
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front++;
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}
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}
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vec4 ev;
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mat.transform(extrude, ev);
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if(ev.z < -ev.w && !front) return false;
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if(front < 8 || ev.z < -ev.w) loopi(8)
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{
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const vec4 &p = v[i];
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if(p.z >= -p.w)
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{
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if(ev.z >= -ev.w) continue;
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float t = ev.z/(ev.z - p.z),
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w = ev.w + t*(p.w - ev.w),
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x = (ev.x + t*(p.x - ev.x))/w,
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y = (ev.y + t*(p.y - ev.y))/w;
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sx1 = min(sx1, x);
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sy1 = min(sy1, y);
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sx2 = max(sx2, x);
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sy2 = max(sy2, y);
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continue;
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}
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loopj(3)
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{
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const vec4 &o = v[i^(1<<j)];
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if(o.z < -o.w) continue;
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float t = p.z/(p.z - o.z),
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w = p.w + t*(o.w - p.w),
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x = (p.x + t*(o.x - p.x))/w,
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y = (p.y + t*(o.y - p.y))/w;
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sx1 = min(sx1, x);
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sy1 = min(sy1, y);
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sx2 = max(sx2, x);
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sy2 = max(sy2, y);
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}
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if(ev.z < -ev.w) continue;
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float t = p.z/(p.z - ev.z),
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w = p.w + t*(ev.w - p.w),
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x = (p.x + t*(ev.x - p.x))/w,
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y = (p.y + t*(ev.y - p.y))/w;
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sx1 = min(sx1, x);
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sy1 = min(sy1, y);
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sx2 = max(sx2, x);
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sy2 = max(sy2, y);
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}
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if(ev.z >= -ev.w)
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{
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float x = ev.x/ev.w, y = ev.y/ev.w;
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if((sx1 >= 1 && x >= 1) || (sy1 >= 1 && y >= 1) || (sx2 <= -1 && x <= -1) || (sy2 <= -1 && y <= -1)) return false;
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int tx = int(floor(SHADOWCOLUMNS * (y + 1) / 2)), ty = int(floor(SHADOWROWS * (x + 1) / 2)),
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tx1 = int(floor(SHADOWCOLUMNS * (sy1 + 1) / 2)), ty1 = int(floor(SHADOWROWS * (sx1 + 1) / 2)),
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tx2 = int(floor(SHADOWCOLUMNS * (sy2 + 1) / 2)), ty2 = int(floor(SHADOWROWS * (sx2 + 1) / 2));
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if(tx < tx1)
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{
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if(ty < ty1) { swap(ty1, ty2); tx1--; ty1--; }
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else if(ty > ty2) { tx1--; ty1++; }
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else { tx2 = tx1; tx1--; tx2--; }
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}
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else if(tx > tx2)
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{
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if(ty < ty1) { ty1--; tx2++; }
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else if(ty > ty2) { swap(ty1, ty2); ty1++; tx2++; }
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else { tx1 = tx2; tx1++; tx2++; }
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}
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else
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{
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if(ty < ty1) { ty2 = ty1; ty1--; ty2--; }
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else if(ty > ty2) { ty1 = ty2; ty1++; ty2++; }
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else goto noextrusion;
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}
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extrudeshadowtiles(tx, ty, tx1, ty1, tx2, ty2);
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shadowx1 = min(x, shadowx1);
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shadowy1 = min(y, shadowy1);
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shadowx2 = max(x, shadowx2);
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shadowy2 = max(y, shadowy2);
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noextrusion:;
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}
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else if(sx1 >= 1 || sy1 >= 1 || sx2 <= -1 || sy2 <= -1) return false;
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shadowcasters++;
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addshadowtiles(sx1, sy1, sx2, sy2);
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return true;
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}
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static void rendershadowtiles()
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{
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shadowx1 = clamp(shadowx1, -1.0f, 1.0f);
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shadowy1 = clamp(shadowy1, -1.0f, 1.0f);
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shadowx2 = clamp(shadowx2, -1.0f, 1.0f);
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shadowy2 = clamp(shadowy2, -1.0f, 1.0f);
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if(shadowx1 >= shadowx2 || shadowy1 >= shadowy2) return;
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float clipx1 = (shadowy1 + 1) / 2,
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clipy1 = (shadowx1 + 1) / 2,
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clipx2 = (shadowy2 + 1) / 2,
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clipy2 = (shadowx2 + 1) / 2;
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if(!shadowclip)
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{
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clipx1 = clipy1 = 0;
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clipx2 = clipy2 = 1;
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}
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if(!shadowtile)
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{
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glBegin(GL_TRIANGLE_STRIP);
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glVertex2f(clipy1, clipx1);
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glVertex2f(clipy1, clipx2);
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glVertex2f(clipy2, clipx1);
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glVertex2f(clipy2, clipx2);
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xtraverts += 4;
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glEnd();
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return;
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}
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glBegin(GL_QUADS);
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float tw = 1.0f/SHADOWCOLUMNS, th = 1.0f/SHADOWROWS;
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loop(y, SHADOWROWS+1)
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{
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uint mask = shadowtiles[y];
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int x = 0;
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while(mask)
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{
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while(!(mask&0xFF)) { mask >>= 8; x += 8; }
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while(!(mask&1)) { mask >>= 1; x++; }
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int xstart = x;
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do { mask >>= 1; x++; } while(mask&1);
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uint strip = (SHADOWCOLUMNMASK>>(SHADOWCOLUMNS - x)) & (SHADOWCOLUMNMASK<<xstart);
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int yend = y;
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do { shadowtiles[yend] &= ~strip; yend++; } while((shadowtiles[yend] & strip) == strip);
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float vx = xstart*tw,
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vy = y*th,
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vw = (x-xstart)*tw,
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vh = (yend-y)*th,
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vx1 = max(vx, clipx1),
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vy1 = max(vy, clipy1),
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vx2 = min(vx+vw, clipx2),
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vy2 = min(vy+vh, clipy2);
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glVertex2f(vy1, vx1);
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glVertex2f(vy1, vx2);
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glVertex2f(vy2, vx2);
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glVertex2f(vy2, vx1);
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xtraverts += 4;
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}
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}
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glEnd();
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}
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void drawstencilshadows()
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{
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glDisable(GL_FOG);
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glEnable(GL_STENCIL_TEST);
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glDisable(GL_TEXTURE_2D);
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glDepthMask(GL_FALSE);
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glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
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stenciling = 1;
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shadowcasters = 0;
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shadowx2 = shadowy2 = -1;
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shadowx1 = shadowy1 = 1;
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memset(shadowtiles, 0, sizeof(shadowtiles));
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if(hasST2 || hasSTS)
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{
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glDisable(GL_CULL_FACE);
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if(hasST2)
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{
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glEnable(GL_STENCIL_TEST_TWO_SIDE_EXT);
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glActiveStencilFace_(GL_BACK);
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glStencilFunc(GL_ALWAYS, 0, ~0U);
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glStencilOp(GL_KEEP, GL_KEEP, hasSTW ? GL_INCR_WRAP_EXT : GL_INCR);
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glActiveStencilFace_(GL_FRONT);
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glStencilFunc(GL_ALWAYS, 0, ~0U);
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glStencilOp(GL_KEEP, GL_KEEP, hasSTW ? GL_DECR_WRAP_EXT : GL_DECR);
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}
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else
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{
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glStencilFuncSeparate_(GL_ALWAYS, GL_ALWAYS, 0, ~0U);
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glStencilOpSeparate_(GL_BACK, GL_KEEP, GL_KEEP, hasSTW ? GL_INCR_WRAP_EXT : GL_INCR);
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glStencilOpSeparate_(GL_FRONT, GL_KEEP, GL_KEEP, hasSTW ? GL_DECR_WRAP_EXT : GL_DECR);
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}
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startmodelbatches();
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rendermapmodels();
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renderentities();
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renderclients();
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renderbounceents();
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endmodelbatches();
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if(hasST2) glDisable(GL_STENCIL_TEST_TWO_SIDE_EXT);
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glEnable(GL_CULL_FACE);
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}
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else
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{
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glStencilFunc(GL_ALWAYS, 0, ~0U);
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glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
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startmodelbatches();
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rendermapmodels();
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renderentities();
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renderclients();
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renderbounceents();
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endmodelbatches(false);
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if(shadowcasters)
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{
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stenciling = 2;
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glStencilFunc(GL_ALWAYS, 0, ~0U);
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glStencilOp(GL_KEEP, GL_KEEP, GL_DECR);
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glCullFace(GL_BACK);
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endmodelbatches(true);
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glCullFace(GL_FRONT);
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}
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else clearmodelbatches();
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}
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stenciling = 0;
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glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
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glDepthMask(GL_TRUE);
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if(shadowcasters)
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{
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glDisable(GL_DEPTH_TEST);
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glStencilFunc(GL_NOTEQUAL, (hasST2 || hasSTS) && !hasSTW ? 128 : 0, ~0U);
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glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
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glEnable(GL_BLEND);
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glBlendFunc(GL_ZERO, GL_SRC_COLOR);
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float intensity = 1.0f - stencilshadow/100.0f;
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glColor3f(intensity, intensity, intensity);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(0, 1, 0, 1, -1, 1);
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glLoadIdentity();
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static uint debugtiles[SHADOWROWS+1];
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if(dbgtiles) memcpy(debugtiles, shadowtiles, sizeof(debugtiles));
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rendershadowtiles();
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if(dbgtiles)
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{
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glDisable(GL_STENCIL_TEST);
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glColor3f(0.5f, 1, 0.5f);
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memcpy(shadowtiles, debugtiles, sizeof(debugtiles));
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rendershadowtiles();
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glColor3f(0, 0, 1);
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glDisable(GL_BLEND);
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glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
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memcpy(shadowtiles, debugtiles, sizeof(debugtiles));
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rendershadowtiles();
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glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
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}
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else glDisable(GL_BLEND);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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setperspective(fovy, aspect, 0.15f, farplane);
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glMatrixMode(GL_MODELVIEW);
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glPopMatrix();
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glEnable(GL_DEPTH_TEST);
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}
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// necessary to avoid ATI bug!
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// punts to software mode if separate stencil op is set, even while stencil disabled, when drawing lines!
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glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
|
|
|
|
glDisable(GL_STENCIL_TEST);
|
|
glEnable(GL_TEXTURE_2D);
|
|
glEnable(GL_FOG);
|
|
}
|
|
|