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https://github.com/yquake2/yquake2remaster.git
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cleanup alias scan conversion
This commit is contained in:
Denis
parent
85b7ae87ef
commit
6d1ac97a77
1 changed files with 185 additions and 215 deletions
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@ -24,7 +24,6 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#include <limits.h>
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typedef struct {
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int isflattop;
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int numleftedges;
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compactvert_t *pleftedgevert0;
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compactvert_t *pleftedgevert1;
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@ -44,18 +43,18 @@ static int d_xdenom;
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static edgetable *pedgetable;
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static edgetable edgetables[12] = {
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{0, 1, &r_p0, &r_p2, NULL, 2, &r_p0, &r_p1, &r_p2},
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{0, 2, &r_p1, &r_p0, &r_p2, 1, &r_p1, &r_p2, NULL},
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{1, 1, &r_p0, &r_p2, NULL, 1, &r_p1, &r_p2, NULL},
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{0, 1, &r_p1, &r_p0, NULL, 2, &r_p1, &r_p2, &r_p0},
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{0, 2, &r_p0, &r_p2, &r_p1, 1, &r_p0, &r_p1, NULL},
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{0, 1, &r_p2, &r_p1, NULL, 1, &r_p2, &r_p0, NULL},
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{0, 1, &r_p2, &r_p1, NULL, 2, &r_p2, &r_p0, &r_p1},
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{0, 2, &r_p2, &r_p1, &r_p0, 1, &r_p2, &r_p0, NULL},
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{0, 1, &r_p1, &r_p0, NULL, 1, &r_p1, &r_p2, NULL},
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{1, 1, &r_p2, &r_p1, NULL, 1, &r_p0, &r_p1, NULL},
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{1, 1, &r_p1, &r_p0, NULL, 1, &r_p2, &r_p0, NULL},
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{0, 1, &r_p0, &r_p2, NULL, 1, &r_p0, &r_p1, NULL},
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{1, &r_p0, &r_p2, &r_p2, 2, &r_p0, &r_p1, &r_p2},
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{2, &r_p1, &r_p0, &r_p2, 1, &r_p1, &r_p2, &r_p2},
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{1, &r_p0, &r_p2, &r_p2, 1, &r_p1, &r_p2, &r_p2}, // flat top
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{1, &r_p1, &r_p0, &r_p0, 2, &r_p1, &r_p2, &r_p0},
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{2, &r_p0, &r_p2, &r_p1, 1, &r_p0, &r_p1, &r_p1},
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{1, &r_p2, &r_p1, &r_p1, 1, &r_p2, &r_p0, &r_p0},
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{1, &r_p2, &r_p1, &r_p1, 2, &r_p2, &r_p0, &r_p1},
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{2, &r_p2, &r_p1, &r_p0, 1, &r_p2, &r_p0, &r_p0},
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{1, &r_p1, &r_p0, &r_p0, 1, &r_p1, &r_p2, &r_p2},
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{1, &r_p2, &r_p1, &r_p1, 1, &r_p0, &r_p1, &r_p1}, // flat top
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{1, &r_p1, &r_p0, &r_p0, 1, &r_p2, &r_p0, &r_p0}, // flat top
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{1, &r_p0, &r_p2, &r_p2, 1, &r_p0, &r_p1, &r_p1},
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};
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// FIXME: some of these can become statics
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@ -200,13 +199,6 @@ static void
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R_PushEdgesSpan(int u, int v, int count,
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pixel_t* d_ptex, int d_sfrac, int d_tfrac, light3_t d_light, zvalue_t d_zi)
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{
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if (d_pedgespanpackage >= triangles_max)
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{
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// no space any more
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r_outoftriangles = true;
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return;
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}
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d_pedgespanpackage->u = u;
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d_pedgespanpackage->v = v;
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d_pedgespanpackage->count = count;
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@ -299,6 +291,41 @@ quotient must fit in 32 bits.
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FIXME: GET RID OF THIS! (FloorDivMod)
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====================
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*/
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#if defined(__i386__) || defined(__amd64__)
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// just exclude ARM32 with FPU, e.g. Pi 1
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static void
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FloorDivMod(int numer, int denom, int *quo, int *rem)
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{
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int q, r;
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q = numer / denom;
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r = numer - q * denom;
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if (-1/2 || 1/-2 || -1/-2) {
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// long live C89
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if (r < 0 && r < denom) {
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q += 1;
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r -= denom;
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}
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} else {
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// C99 always truncates to 0
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if ((numer ^ denom) < 0 && r != 0) {
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q -= 1;
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r += denom;
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}
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}
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assert(r == numer - q * denom);
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if ((numer < 0) ^ (denom < 0))
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assert(q <= 0);
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else
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assert(q >= 0);
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if (denom < 0)
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assert(r > denom && r <= 0);
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else
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assert(r >= 0 && r < denom);
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*quo = q;
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*rem = r;
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}
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#else
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static void
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FloorDivMod (float numer, float denom, int *quotient,
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int *rem)
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@ -331,7 +358,7 @@ FloorDivMod (float numer, float denom, int *quotient,
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*quotient = q;
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*rem = r;
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}
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#endif
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/*
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===================
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@ -342,20 +369,17 @@ static void
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R_PolysetSetUpForLineScan(fixed8_t startvertu, fixed8_t startvertv,
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fixed8_t endvertu, fixed8_t endvertv)
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{
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float tm, tn;
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errorterm = -1;
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int tm, tn;
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tm = endvertu - startvertu;
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tn = endvertv - startvertv;
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FloorDivMod (tm, tn, &ubasestep, &erroradjustup);
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errorterm = -1;
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erroradjustdown = tn;
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FloorDivMod (tm, tn, &ubasestep, &erroradjustup);
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}
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/*
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================
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R_PolysetCalcGradients
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@ -492,7 +516,7 @@ R_PolysetDrawSpans8_33(const entity_t *currententity, spanpackage_t *pspanpackag
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}
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pspanpackage++;
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} while ((pspanpackage < triangles_max) && (pspanpackage->count != INT_MIN));
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} while (pspanpackage->count != INT_MIN);
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}
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void
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@ -539,7 +563,7 @@ R_PolysetDrawSpansConstant8_33(const entity_t *currententity, spanpackage_t *psp
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}
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pspanpackage++;
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} while ((pspanpackage < triangles_max) && (pspanpackage->count != INT_MIN));
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} while (pspanpackage->count != INT_MIN);
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}
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void
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@ -621,7 +645,7 @@ R_PolysetDrawSpans8_66(const entity_t *currententity, spanpackage_t *pspanpackag
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}
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pspanpackage++;
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} while ((pspanpackage < triangles_max) && (pspanpackage->count != INT_MIN));
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} while (pspanpackage->count != INT_MIN);
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}
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void
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@ -679,7 +703,7 @@ R_PolysetDrawSpansConstant8_66(const entity_t *currententity, spanpackage_t *psp
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}
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pspanpackage++;
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} while ((pspanpackage < triangles_max) && (pspanpackage->count != INT_MIN));
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} while (pspanpackage->count != INT_MIN);
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}
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void
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@ -762,7 +786,79 @@ R_PolysetDrawSpans8_Opaque (const entity_t *currententity, spanpackage_t *pspanp
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}
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pspanpackage++;
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} while ((pspanpackage < triangles_max) && (pspanpackage->count != INT_MIN));
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} while (pspanpackage->count != INT_MIN);
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}
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static void
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R_ProcessLeftEdge(compactvert_t *plefttop, compactvert_t *prighttop,
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compactvert_t *pleftbottom)
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{
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light3_t working_lstepx;
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pixel_t *d_ptex;
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int u, v;
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int s, t;
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int height;
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int i;
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u = plefttop->u;
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v = plefttop->v;
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d_aspancount = plefttop->u - prighttop->u;
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s = plefttop->s;
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t = plefttop->t;
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i = (s >> SHIFT16XYZ) + (t >> SHIFT16XYZ) * r_affinetridesc.skinwidth;
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d_ptex = &r_affinetridesc.pskin[i];
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d_sfrac = s & 0xFFFF;
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d_tfrac = t & 0xFFFF;
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memcpy(d_light, plefttop->l, sizeof(light3_t));
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d_zi = plefttop->zi;
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height = pleftbottom->v - plefttop->v;
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if (height == 1)
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{
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// skip calculations needed for 2+ spans
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R_PushEdgesSpan(u, v, d_aspancount,
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d_ptex, d_sfrac, d_tfrac, d_light, d_zi);
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return;
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}
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R_PolysetSetUpForLineScan(plefttop->u, plefttop->v,
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pleftbottom->u, pleftbottom->v);
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// for negative steps in x along left edge, bias toward overflow rather than
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// underflow (sort of turning the floor () we did in the gradient calcs into
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// ceil (), but plus a little bit)
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t = ubasestep < 0;
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for (i = 0; i < 3; i++)
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working_lstepx[i] = r_lstepx[i] - t;
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// base steps for drawers
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s = r_sstepy + r_sstepx * ubasestep;
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t = r_tstepy + r_tstepx * ubasestep;
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d_ptexbasestep = (s >> SHIFT16XYZ) +
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(t >> SHIFT16XYZ) * r_affinetridesc.skinwidth;
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d_sfracbasestep = s & 0xFFFF;
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d_tfracbasestep = t & 0xFFFF;
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for (i = 0; i < 3; i++)
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d_lightbasestep[i] = r_lstepy[i] + working_lstepx[i] * ubasestep;
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d_zibasestep = r_zistepy + r_zistepx * ubasestep;
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// extra steps for drawers
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s += r_sstepx;
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t += r_tstepx;
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d_ptexextrastep = (s >> SHIFT16XYZ) +
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(t >> SHIFT16XYZ) * r_affinetridesc.skinwidth;
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d_sfracextrastep = s & 0xFFFF;
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d_tfracextrastep = t & 0xFFFF;
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for (i = 0; i < 3; i++)
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d_lightextrastep[i] = d_lightbasestep[i] + working_lstepx[i];
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d_ziextrastep = d_zibasestep + r_zistepx;
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R_PolysetScanLeftEdge_C(height, d_ptex, u, v);
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}
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/*
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@ -773,12 +869,14 @@ R_RasterizeAliasPolySmooth
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static void
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R_RasterizeAliasPolySmooth(const entity_t *currententity)
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{
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int initialleftheight, initialrightheight;
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compactvert_t *plefttop, *prighttop, *pleftbottom, *prightbottom;
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light3_t working_lstepx;
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spanpackage_t *pstart;
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int originalcount;
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int u, v;
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pixel_t *d_ptex;
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int leftheight, rightheight;
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// set the s, t, and light gradients, which are consistent across
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// the triangle because being a triangle, things are affine
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R_PolysetCalcGradients (r_affinetridesc.skinwidth);
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plefttop = pedgetable->pleftedgevert0;
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prighttop = pedgetable->prightedgevert0;
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@ -786,204 +884,76 @@ R_RasterizeAliasPolySmooth(const entity_t *currententity)
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pleftbottom = pedgetable->pleftedgevert1;
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prightbottom = pedgetable->prightedgevert1;
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initialleftheight = pleftbottom->v - plefttop->v;
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initialrightheight = prightbottom->v - prighttop->v;
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//
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// set the s, t, and light gradients, which are consistent across the triangle
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// because being a triangle, things are affine
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//
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R_PolysetCalcGradients (r_affinetridesc.skinwidth);
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//
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// rasterize the polygon
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//
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//
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// scan out the top (and possibly only) part of the left edge
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//
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d_pedgespanpackage = triangle_spans;
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u = plefttop->u;
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v = plefttop->v;
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d_aspancount = plefttop->u - prighttop->u;
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d_ptex = r_affinetridesc.pskin + (plefttop->s >> SHIFT16XYZ) +
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(plefttop->t >> SHIFT16XYZ) * r_affinetridesc.skinwidth;
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// make sure we have enough spans for the full height
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// plus 1 more for the list terminator.
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// vert2 in the edgetable is always the lowest.
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// (this is silly anyway, just allocate vid.height+1)
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leftheight = pedgetable->pleftedgevert2->v - plefttop->v;
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rightheight = pedgetable->prightedgevert2->v - prighttop->v;
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if (leftheight < rightheight)
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leftheight = rightheight;
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if (&triangle_spans[leftheight] >= triangles_max)
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{
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d_sfrac = plefttop->s & 0xFFFF;
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d_tfrac = plefttop->t & 0xFFFF;
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}
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memcpy(d_light, plefttop->l, sizeof(light3_t));
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d_zi = plefttop->zi;
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if (initialleftheight == 1)
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{
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R_PushEdgesSpan(u, v, d_aspancount,
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d_ptex, d_sfrac, d_tfrac, d_light, d_zi);
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}
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else
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{
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int i;
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R_PolysetSetUpForLineScan(plefttop->u, plefttop->v,
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pleftbottom->u, pleftbottom->v);
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// TODO: can reuse partial expressions here
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// for negative steps in x along left edge, bias toward overflow rather than
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// underflow (sort of turning the floor () we did in the gradient calcs into
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// ceil (), but plus a little bit)
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if (ubasestep < 0)
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{
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for(i=0; i<3; i++)
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working_lstepx[i] = r_lstepx[i] - 1;
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}
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else
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memcpy(working_lstepx, r_lstepx, sizeof(light3_t));
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d_ptexbasestep = ((r_sstepy + r_sstepx * ubasestep) >> SHIFT16XYZ) +
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((r_tstepy + r_tstepx * ubasestep) >> SHIFT16XYZ) *
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r_affinetridesc.skinwidth;
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d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) & 0xFFFF;
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d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) & 0xFFFF;
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for(i=0; i<3; i++)
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d_lightbasestep[i] = r_lstepy[i] + working_lstepx[i] * ubasestep;
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d_zibasestep = r_zistepy + r_zistepx * ubasestep;
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d_ptexextrastep = ((r_sstepy + r_sstepx * (ubasestep + 1)) >> SHIFT16XYZ) +
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((r_tstepy + r_tstepx * (ubasestep + 1)) >> SHIFT16XYZ) *
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r_affinetridesc.skinwidth;
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d_sfracextrastep = (r_sstepy + r_sstepx*(ubasestep + 1)) & 0xFFFF;
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d_tfracextrastep = (r_tstepy + r_tstepx*(ubasestep + 1)) & 0xFFFF;
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for(i=0; i<3; i++)
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d_lightextrastep[i] = d_lightbasestep[i] + working_lstepx[i];
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d_ziextrastep = d_zibasestep + r_zistepx;
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R_PolysetScanLeftEdge_C(initialleftheight, d_ptex, u, v);
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}
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//
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// scan out the bottom part of the left edge, if it exists
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//
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if (pedgetable->numleftedges == 2)
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{
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int height;
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plefttop = pleftbottom;
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pleftbottom = pedgetable->pleftedgevert2;
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height = pleftbottom->v - plefttop->v;
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// TODO: make this a function; modularize this function in general
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u = plefttop->u;
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v = plefttop->v;
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d_aspancount = plefttop->u - prighttop->u;
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d_ptex = r_affinetridesc.pskin + (plefttop->s >> SHIFT16XYZ) +
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(plefttop->t >> SHIFT16XYZ) * r_affinetridesc.skinwidth;
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d_sfrac = 0;
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d_tfrac = 0;
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memcpy(d_light, plefttop->l, sizeof(light3_t));
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d_zi = plefttop->zi;
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if (height == 1)
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{
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R_PushEdgesSpan(u, v, d_aspancount,
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d_ptex, d_sfrac, d_tfrac, d_light, d_zi);
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}
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else
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{
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int i;
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R_PolysetSetUpForLineScan(plefttop->u, plefttop->v,
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pleftbottom->u, pleftbottom->v);
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if (ubasestep < 0)
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{
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for(i=0; i<3; i++)
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working_lstepx[i] = r_lstepx[i] - 1;
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}
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else
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memcpy(working_lstepx, r_lstepx, sizeof(light3_t));
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|
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d_ptexbasestep = ((r_sstepy + r_sstepx * ubasestep) >> SHIFT16XYZ) +
|
||||
((r_tstepy + r_tstepx * ubasestep) >> SHIFT16XYZ) *
|
||||
r_affinetridesc.skinwidth;
|
||||
|
||||
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) & 0xFFFF;
|
||||
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) & 0xFFFF;
|
||||
|
||||
for(i=0; i<3; i++)
|
||||
d_lightbasestep[i] = r_lstepy[i] + working_lstepx[i] * ubasestep;
|
||||
|
||||
d_zibasestep = r_zistepy + r_zistepx * ubasestep;
|
||||
|
||||
d_ptexextrastep = ((r_sstepy + r_sstepx * (ubasestep + 1)) >> SHIFT16XYZ) +
|
||||
((r_tstepy + r_tstepx * (ubasestep + 1)) >> SHIFT16XYZ) *
|
||||
r_affinetridesc.skinwidth;
|
||||
|
||||
d_sfracextrastep = (r_sstepy+r_sstepx*(ubasestep + 1)) & 0xFFFF;
|
||||
d_tfracextrastep = (r_tstepy+r_tstepx*(ubasestep + 1)) & 0xFFFF;
|
||||
|
||||
for(i=0; i<3; i++)
|
||||
d_lightextrastep[i] = d_lightbasestep[i] + working_lstepx[i];
|
||||
d_ziextrastep = d_zibasestep + r_zistepx;
|
||||
|
||||
R_PolysetScanLeftEdge_C(height, d_ptex, u, v);
|
||||
}
|
||||
}
|
||||
|
||||
// scan out the top (and possibly only) part of the right edge, updating the
|
||||
// count field
|
||||
R_PolysetSetUpForLineScan(prighttop->u, prighttop->v,
|
||||
prightbottom->u, prightbottom->v);
|
||||
d_aspancount = 0;
|
||||
if ((triangle_spans + initialrightheight) >= triangles_max)
|
||||
{
|
||||
// we dont have enough triangles for save full height
|
||||
r_outoftriangles = true;
|
||||
return;
|
||||
}
|
||||
originalcount = triangle_spans[initialrightheight].count;
|
||||
triangle_spans[initialrightheight].count = INT_MIN; // mark end of the spanpackages
|
||||
// init span allocation ptr
|
||||
d_pedgespanpackage = triangle_spans;
|
||||
|
||||
// 1. scan out the top (and possibly only) part of the left edge
|
||||
R_ProcessLeftEdge(plefttop, prighttop, pleftbottom);
|
||||
|
||||
// 2. scan out the bottom part of the left edge, if it exists
|
||||
if (pedgetable->numleftedges == 2)
|
||||
{
|
||||
plefttop = pleftbottom;
|
||||
pleftbottom = pedgetable->pleftedgevert2;
|
||||
|
||||
R_ProcessLeftEdge(plefttop, prighttop, pleftbottom);
|
||||
}
|
||||
assert(d_pedgespanpackage <= triangles_max);
|
||||
|
||||
// 3. scan out the top (and possibly only) part of the right edge,
|
||||
// drawing spans that terminate on it
|
||||
rightheight = prightbottom->v - prighttop->v;
|
||||
|
||||
// reset u delta before drawing the top
|
||||
d_aspancount = 0;
|
||||
|
||||
// save for step 4
|
||||
pstart = &triangle_spans[rightheight];
|
||||
originalcount = pstart->count;
|
||||
// mark end of the spanpackages
|
||||
pstart->count = INT_MIN;
|
||||
|
||||
R_PolysetSetUpForLineScan(prighttop->u, prighttop->v,
|
||||
prightbottom->u, prightbottom->v);
|
||||
(*d_pdrawspans) (currententity, triangle_spans);
|
||||
|
||||
// scan out the bottom part of the right edge, if it exists
|
||||
// 4. scan out the bottom part of the right edge, if it exists
|
||||
if (pedgetable->numrightedges == 2)
|
||||
{
|
||||
int height;
|
||||
spanpackage_t *pstart;
|
||||
|
||||
pstart = triangle_spans + initialrightheight;
|
||||
// 4.1 restore the starting span count
|
||||
pstart->count = originalcount;
|
||||
|
||||
d_aspancount = prightbottom->u - prighttop->u;
|
||||
|
||||
// 4.2 shift verts like in step 2
|
||||
prighttop = prightbottom;
|
||||
prightbottom = pedgetable->prightedgevert2;
|
||||
|
||||
height = prightbottom->v - prighttop->v;
|
||||
// 4.3 increase right height
|
||||
rightheight += prightbottom->v - prighttop->v;
|
||||
|
||||
// mark end of the spanpackages
|
||||
triangle_spans[rightheight].count = INT_MIN;
|
||||
|
||||
R_PolysetSetUpForLineScan(prighttop->u, prighttop->v,
|
||||
prightbottom->u, prightbottom->v);
|
||||
|
||||
if ((triangle_spans + initialrightheight + height) >= triangles_max)
|
||||
{
|
||||
// we dont have enough triangles for save full height
|
||||
r_outoftriangles = true;
|
||||
return;
|
||||
}
|
||||
triangle_spans[initialrightheight + height].count = INT_MIN; // mark end of the spanpackages
|
||||
(*d_pdrawspans) (currententity, pstart);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
================
|
||||
R_PolysetSetEdgeTable
|
||||
|
|
|
|||
Loading…
Reference in a new issue