quakeforge/libs/video/renderer/sw32/sw32_ralias.c

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/*
sw32_ralias.c
routines for setting up to draw alias models
Copyright (C) 1996-1997 Id Software, Inc.
This program 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.
This program 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 this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((used)) const char rcsid[] =
"$Id$";
#include "QF/image.h"
#include "QF/render.h"
#include "QF/skin.h"
#include "QF/sys.h"
#include "d_ifacea.h"
#include "r_local.h"
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#include "stdlib.h"
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#define LIGHT_MIN 5 // lowest light value we'll allow, to
// avoid the need for inner-loop light
// clamping
mtriangle_t *ptriangles;
affinetridesc_t r_affinetridesc;
void *acolormap; // FIXME: should go away
trivertx_t *r_apverts;
// TODO: these probably will go away with optimized rasterization
mdl_t *pmdl;
vec3_t r_plightvec;
int r_ambientlight;
float r_shadelight;
aliashdr_t *paliashdr;
finalvert_t *pfinalverts;
auxvert_t *pauxverts;
static float ziscale;
static model_t *pmodel;
static vec3_t alias_forward, alias_right, alias_up;
static maliasskindesc_t *pskindesc;
int r_amodels_drawn;
int a_skinwidth;
int r_anumverts;
float aliastransform[3][4];
typedef struct {
int index0;
int index1;
} aedge_t;
static aedge_t aedges[12] = {
{0, 1}, {1, 2}, {2, 3}, {3, 0},
{4, 5}, {5, 6}, {6, 7}, {7, 4},
{0, 5}, {1, 4}, {2, 7}, {3, 6}
};
float r_avertexnormals[NUMVERTEXNORMALS][3] = {
#include "anorms.h"
};
qboolean
R_AliasCheckBBox (void)
{
int i, flags, frame, numv;
aliashdr_t *pahdr;
float zi, basepts[8][3], v0, v1, frac;
finalvert_t *pv0, *pv1, viewpts[16];
auxvert_t *pa0, *pa1, viewaux[16];
maliasframedesc_t *pframedesc;
qboolean zclipped, zfullyclipped;
unsigned int anyclip, allclip;
int minz;
// expand, rotate, and translate points into worldspace
currententity->trivial_accept = 0;
pmodel = currententity->model;
if (!(pahdr = pmodel->aliashdr))
pahdr = Cache_Get (&pmodel->cache);
pmdl = (mdl_t *) ((byte *) pahdr + pahdr->model);
R_AliasSetUpTransform (0);
// construct the base bounding box for this frame
frame = currententity->frame;
// TODO: don't repeat this check when drawing?
if ((frame >= pmdl->numframes) || (frame < 0)) {
Sys_MaskPrintf (SYS_DEV, "No such frame %d %s\n", frame, pmodel->name);
frame = 0;
}
pframedesc = &pahdr->frames[frame];
// x worldspace coordinates
basepts[0][0] = basepts[1][0] = basepts[2][0] = basepts[3][0] =
(float) pframedesc->bboxmin.v[0];
basepts[4][0] = basepts[5][0] = basepts[6][0] = basepts[7][0] =
(float) pframedesc->bboxmax.v[0];
// y worldspace coordinates
basepts[0][1] = basepts[3][1] = basepts[5][1] = basepts[6][1] =
(float) pframedesc->bboxmin.v[1];
basepts[1][1] = basepts[2][1] = basepts[4][1] = basepts[7][1] =
(float) pframedesc->bboxmax.v[1];
// z worldspace coordinates
basepts[0][2] = basepts[1][2] = basepts[4][2] = basepts[5][2] =
(float) pframedesc->bboxmin.v[2];
basepts[2][2] = basepts[3][2] = basepts[6][2] = basepts[7][2] =
(float) pframedesc->bboxmax.v[2];
zclipped = false;
zfullyclipped = true;
minz = 9999;
for (i = 0; i < 8; i++) {
R_AliasTransformVector (&basepts[i][0], &viewaux[i].fv[0]);
if (viewaux[i].fv[2] < ALIAS_Z_CLIP_PLANE) {
// we must clip points that are closer than the near clip plane
viewpts[i].flags = ALIAS_Z_CLIP;
zclipped = true;
} else {
if (viewaux[i].fv[2] < minz)
minz = viewaux[i].fv[2];
viewpts[i].flags = 0;
zfullyclipped = false;
}
}
if (zfullyclipped) {
if (!pmodel->aliashdr)
Cache_Release (&pmodel->cache);
return false; // everything was near-z-clipped
}
numv = 8;
if (zclipped) {
// organize points by edges, use edges to get new points (possible
// trivial reject)
for (i = 0; i < 12; i++) {
// edge endpoints
pv0 = &viewpts[aedges[i].index0];
pv1 = &viewpts[aedges[i].index1];
pa0 = &viewaux[aedges[i].index0];
pa1 = &viewaux[aedges[i].index1];
// if one end is clipped and the other isn't, make a new point
if (pv0->flags ^ pv1->flags) {
frac = (ALIAS_Z_CLIP_PLANE - pa0->fv[2]) /
(pa1->fv[2] - pa0->fv[2]);
viewaux[numv].fv[0] = pa0->fv[0] +
(pa1->fv[0] - pa0->fv[0]) * frac;
viewaux[numv].fv[1] = pa0->fv[1] +
(pa1->fv[1] - pa0->fv[1]) * frac;
viewaux[numv].fv[2] = ALIAS_Z_CLIP_PLANE;
viewpts[numv].flags = 0;
numv++;
}
}
}
// project the vertices that remain after clipping
anyclip = 0;
allclip = ALIAS_XY_CLIP_MASK;
// TODO: probably should do this loop in ASM, especially if we use floats
for (i = 0; i < numv; i++) {
// we don't need to bother with vertices that were z-clipped
if (viewpts[i].flags & ALIAS_Z_CLIP)
continue;
zi = 1.0 / viewaux[i].fv[2];
// FIXME: do with chop mode in ASM, or convert to float
v0 = (viewaux[i].fv[0] * xscale * zi) + xcenter;
v1 = (viewaux[i].fv[1] * yscale * zi) + ycenter;
flags = 0;
if (v0 < r_refdef.fvrectx)
flags |= ALIAS_LEFT_CLIP;
if (v1 < r_refdef.fvrecty)
flags |= ALIAS_TOP_CLIP;
if (v0 > r_refdef.fvrectright)
flags |= ALIAS_RIGHT_CLIP;
if (v1 > r_refdef.fvrectbottom)
flags |= ALIAS_BOTTOM_CLIP;
anyclip |= flags;
allclip &= flags;
}
if (allclip) {
if (!pmodel->aliashdr)
Cache_Release (&pmodel->cache);
return false; // trivial reject off one side
}
currententity->trivial_accept = !anyclip & !zclipped;
if (currententity->trivial_accept) {
if (minz > (r_aliastransition + (pmdl->size * r_resfudge))) {
currententity->trivial_accept |= 2;
}
}
if (!pmodel->aliashdr)
Cache_Release (&pmodel->cache);
return true;
}
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void
R_AliasTransformVector (vec3_t in, vec3_t out)
{
out[0] = DotProduct (in, aliastransform[0]) + aliastransform[0][3];
out[1] = DotProduct (in, aliastransform[1]) + aliastransform[1][3];
out[2] = DotProduct (in, aliastransform[2]) + aliastransform[2][3];
}
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static void
R_AliasClipAndProjectFinalVert (finalvert_t *fv, auxvert_t *av)
{
if (av->fv[2] < ALIAS_Z_CLIP_PLANE) {
fv->flags |= ALIAS_Z_CLIP;
return;
}
R_AliasProjectFinalVert (fv, av);
if (fv->v[0] < r_refdef.aliasvrect.x)
fv->flags |= ALIAS_LEFT_CLIP;
if (fv->v[1] < r_refdef.aliasvrect.y)
fv->flags |= ALIAS_TOP_CLIP;
if (fv->v[0] > r_refdef.aliasvrectright)
fv->flags |= ALIAS_RIGHT_CLIP;
if (fv->v[1] > r_refdef.aliasvrectbottom)
fv->flags |= ALIAS_BOTTOM_CLIP;
}
static void
R_AliasTransformFinalVert16 (finalvert_t *fv, auxvert_t *av, trivertx_t *pverts)
{
trivertx_t * pextra;
float vextra[3];
pextra = pverts + pmdl->numverts;
vextra[0] = pverts->v[0] + pextra->v[0] / (float)256;
vextra[1] = pverts->v[1] + pextra->v[1] / (float)256;
vextra[2] = pverts->v[2] + pextra->v[2] / (float)256;
av->fv[0] = DotProduct (vextra, aliastransform[0]) +
aliastransform[0][3];
av->fv[1] = DotProduct (vextra, aliastransform[1]) +
aliastransform[1][3];
av->fv[2] = DotProduct (vextra, aliastransform[2]) +
aliastransform[2][3];
}
static void
R_AliasTransformFinalVert8 (finalvert_t *fv, auxvert_t *av, trivertx_t *pverts)
{
av->fv[0] = DotProduct (pverts->v, aliastransform[0]) +
aliastransform[0][3];
av->fv[1] = DotProduct (pverts->v, aliastransform[1]) +
aliastransform[1][3];
av->fv[2] = DotProduct (pverts->v, aliastransform[2]) +
aliastransform[2][3];
}
/*
R_AliasPreparePoints
General clipped case
*/
static void
R_AliasPreparePoints (void)
{
int i;
stvert_t *pstverts;
finalvert_t *fv;
auxvert_t *av;
mtriangle_t *ptri;
finalvert_t *pfv[3];
pstverts = (stvert_t *) ((byte *) paliashdr + paliashdr->stverts);
r_anumverts = pmdl->numverts;
fv = pfinalverts;
av = pauxverts;
if (pmdl->ident == HEADER_MDL16) {
for (i = 0; i < r_anumverts; i++, fv++, av++, r_apverts++,
pstverts++) {
R_AliasTransformFinalVert16 (fv, av, r_apverts);
R_AliasTransformFinalVert (fv, av, r_apverts, pstverts);
R_AliasClipAndProjectFinalVert (fv, av);
}
}
else {
for (i = 0; i < r_anumverts; i++, fv++, av++, r_apverts++,
pstverts++) {
R_AliasTransformFinalVert8 (fv, av, r_apverts);
R_AliasTransformFinalVert (fv, av, r_apverts, pstverts);
R_AliasClipAndProjectFinalVert (fv, av);
}
}
// clip and draw all triangles
r_affinetridesc.numtriangles = 1;
ptri = (mtriangle_t *) ((byte *) paliashdr + paliashdr->triangles);
for (i = 0; i < pmdl->numtris; i++, ptri++) {
pfv[0] = &pfinalverts[ptri->vertindex[0]];
pfv[1] = &pfinalverts[ptri->vertindex[1]];
pfv[2] = &pfinalverts[ptri->vertindex[2]];
if (pfv[0]->flags & pfv[1]->flags & pfv[2]->
flags & (ALIAS_XY_CLIP_MASK | ALIAS_Z_CLIP))
continue; // completely clipped
if (!((pfv[0]->flags | pfv[1]->flags | pfv[2]->flags) &
(ALIAS_XY_CLIP_MASK | ALIAS_Z_CLIP))) { // totally unclipped
r_affinetridesc.pfinalverts = pfinalverts;
r_affinetridesc.ptriangles = ptri;
D_PolysetDraw ();
} else { // partially clipped
R_AliasClipTriangle (ptri);
}
}
}
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void
R_AliasSetUpTransform (int trivial_accept)
{
int i;
float rotationmatrix[3][4], t2matrix[3][4];
static float tmatrix[3][4];
static float viewmatrix[3][4];
VectorCopy (currententity->transform + 0, alias_forward);
VectorNegate (currententity->transform + 4, alias_right);
VectorCopy (currententity->transform + 8, alias_up);
tmatrix[0][0] = pmdl->scale[0];
tmatrix[1][1] = pmdl->scale[1];
tmatrix[2][2] = pmdl->scale[2];
tmatrix[0][3] = pmdl->scale_origin[0];
tmatrix[1][3] = pmdl->scale_origin[1];
tmatrix[2][3] = pmdl->scale_origin[2];
// TODO: can do this with simple matrix rearrangement
for (i = 0; i < 3; i++) {
t2matrix[i][0] = alias_forward[i];
t2matrix[i][1] = -alias_right[i];
t2matrix[i][2] = alias_up[i];
}
t2matrix[0][3] = -modelorg[0];
t2matrix[1][3] = -modelorg[1];
t2matrix[2][3] = -modelorg[2];
// FIXME: can do more efficiently than full concatenation
R_ConcatTransforms (t2matrix, tmatrix, rotationmatrix);
// TODO: should be global, set when vright, etc., set
VectorCopy (vright, viewmatrix[0]);
VectorCopy (vup, viewmatrix[1]);
VectorNegate (viewmatrix[1], viewmatrix[1]);
VectorCopy (vpn, viewmatrix[2]);
// viewmatrix[0][3] = 0;
// viewmatrix[1][3] = 0;
// viewmatrix[2][3] = 0;
R_ConcatTransforms (viewmatrix, rotationmatrix, aliastransform);
// do the scaling up of x and y to screen coordinates as part of the transform
// for the unclipped case (it would mess up clipping in the clipped case).
// Also scale down z, so 1/z is scaled 31 bits for free, and scale down x and y
// correspondingly so the projected x and y come out right
// FIXME: make this work for clipped case too?
if (trivial_accept) {
for (i = 0; i < 4; i++) {
aliastransform[0][i] *= aliasxscale *
(1.0 / ((float) 0x8000 * 0x10000));
aliastransform[1][i] *= aliasyscale *
(1.0 / ((float) 0x8000 * 0x10000));
aliastransform[2][i] *= 1.0 / ((float) 0x8000 * 0x10000);
}
}
}
/*
R_AliasTransformFinalVert
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now this function just copies the texture coordinates and calculates lighting
actual 3D transform is done by R_AliasTransformFinalVert8/16 functions above
*/
void
R_AliasTransformFinalVert (finalvert_t *fv, auxvert_t *av,
trivertx_t *pverts, stvert_t *pstverts)
{
int temp;
float lightcos, *plightnormal;
fv->v[2] = pstverts->s;
fv->v[3] = pstverts->t;
fv->flags = pstverts->onseam;
// lighting
// LordHavoc: flipped lightcos so it is + for bright, not -
plightnormal = r_avertexnormals[pverts->lightnormalindex];
lightcos = -DotProduct (plightnormal, r_plightvec);
temp = r_ambientlight;
if (lightcos > 0) {
temp += (int) (r_shadelight * lightcos);
// clamp; because we limited the minimum ambient and shading light,
// we don't have to clamp low light, just bright
if (temp < 0)
temp = 0;
}
fv->v[4] = temp;
}
void
R_AliasTransformAndProjectFinalVerts (finalvert_t *fv, stvert_t *pstverts)
{
int i, temp;
float lightcos, *plightnormal, zi;
trivertx_t *pverts;
pverts = r_apverts;
for (i = 0; i < r_anumverts; i++, fv++, pverts++, pstverts++) {
// transform and project
zi = 1.0 / (DotProduct (pverts->v, aliastransform[2]) +
aliastransform[2][3]);
// x, y, and z are scaled down by 1/2**31 in the transform, so 1/z is
// scaled up by 1/2**31, and the scaling cancels out for x and y in
// the projection
fv->v[5] = zi;
fv->v[0] = ((DotProduct (pverts->v, aliastransform[0]) +
aliastransform[0][3]) * zi) + aliasxcenter;
fv->v[1] = ((DotProduct (pverts->v, aliastransform[1]) +
aliastransform[1][3]) * zi) + aliasycenter;
fv->v[2] = pstverts->s;
fv->v[3] = pstverts->t;
fv->flags = pstverts->onseam;
// lighting
// LordHavoc: flipped lightcos so it is + for bright, not -
plightnormal = r_avertexnormals[pverts->lightnormalindex];
lightcos = -DotProduct (plightnormal, r_plightvec);
temp = r_ambientlight;
if (lightcos > 0) {
temp += (int) (r_shadelight * lightcos);
// clamp; because we limited the minimum ambient and shading
// light, we don't have to clamp low light, just bright
if (temp < 0)
temp = 0;
}
fv->v[4] = temp;
}
}
void
R_AliasProjectFinalVert (finalvert_t *fv, auxvert_t *av)
{
float zi;
// project points
zi = 1.0 / av->fv[2];
fv->v[5] = zi * ziscale;
fv->v[0] = (av->fv[0] * aliasxscale * zi) + aliasxcenter;
fv->v[1] = (av->fv[1] * aliasyscale * zi) + aliasycenter;
}
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static void
R_AliasPrepareUnclippedPoints (void)
{
stvert_t *pstverts;
pstverts = (stvert_t *) ((byte *) paliashdr + paliashdr->stverts);
r_anumverts = pmdl->numverts;
R_AliasTransformAndProjectFinalVerts (pfinalverts, pstverts);
r_affinetridesc.pfinalverts = pfinalverts;
r_affinetridesc.ptriangles = (mtriangle_t *)
((byte *) paliashdr + paliashdr->triangles);
r_affinetridesc.numtriangles = pmdl->numtris;
D_PolysetDraw ();
}
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static void
R_AliasSetupSkin (void)
{
int skinnum;
skinnum = currententity->skinnum;
if ((skinnum >= pmdl->numskins) || (skinnum < 0)) {
Sys_MaskPrintf (SYS_DEV, "R_AliasSetupSkin: no such skin # %d\n",
skinnum);
skinnum = 0;
}
pskindesc = R_AliasGetSkindesc (skinnum, paliashdr);
a_skinwidth = pmdl->skinwidth;
r_affinetridesc.pskindesc = pskindesc;
r_affinetridesc.pskin = (void *) ((byte *) paliashdr + pskindesc->skin);
r_affinetridesc.skinwidth = a_skinwidth;
r_affinetridesc.seamfixupX16 = (a_skinwidth >> 1) << 16;
r_affinetridesc.skinheight = pmdl->skinheight;
acolormap = vid.colormap8;
if (currententity->skin) {
tex_t *base;
base = currententity->skin->texels;
if (base) {
r_affinetridesc.pskin = base->data;
r_affinetridesc.skinwidth = base->width;
r_affinetridesc.skinheight = base->height;
}
acolormap = currententity->skin->colormap;
}
}
static void
R_AliasSetupLighting (alight_t *plighting)
{
// guarantee that no vertex will ever be lit below LIGHT_MIN, so we don't
// have to clamp off the bottom
r_ambientlight = plighting->ambientlight;
if (r_ambientlight < LIGHT_MIN)
r_ambientlight = LIGHT_MIN;
r_ambientlight = (/*255 -*/ r_ambientlight) << VID_CBITS;
// if (r_ambientlight < LIGHT_MIN)
// r_ambientlight = LIGHT_MIN;
r_shadelight = plighting->shadelight;
if (r_shadelight < 0)
r_shadelight = 0;
r_shadelight *= VID_GRADES;
// rotate the lighting vector into the model's frame of reference
r_plightvec[0] = DotProduct (plighting->plightvec, alias_forward);
r_plightvec[1] = -DotProduct (plighting->plightvec, alias_right);
r_plightvec[2] = DotProduct (plighting->plightvec, alias_up);
}
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/*
R_AliasSetupFrame
set r_apverts
*/
static void
R_AliasSetupFrame (void)
{
maliasframedesc_t *frame;
frame = R_AliasGetFramedesc (currententity->frame, paliashdr);
r_apverts = (trivertx_t *) ((byte *) paliashdr + frame->frame);
}
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void
R_AliasDrawModel (alight_t *plighting)
{
int size;
finalvert_t *finalverts;
r_amodels_drawn++;
if (!(paliashdr = currententity->model->aliashdr))
paliashdr = Cache_Get (&currententity->model->cache);
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pmdl = (mdl_t *) ((byte *) paliashdr + paliashdr->model);
size = (CACHE_SIZE - 1)
+ sizeof (finalvert_t) * (pmdl->numverts + 1)
+ sizeof (auxvert_t) * pmdl->numverts;
finalverts = (finalvert_t *) Hunk_TempAlloc (size);
if (!finalverts)
Sys_Error ("R_AliasDrawModel: out of memory");
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// cache align
pfinalverts = (finalvert_t *)
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(((intptr_t) &finalverts[0] + CACHE_SIZE - 1) & ~(CACHE_SIZE - 1));
pauxverts = (auxvert_t *) &pfinalverts[pmdl->numverts + 1];
R_AliasSetupSkin ();
R_AliasSetUpTransform (currententity->trivial_accept);
R_AliasSetupLighting (plighting);
R_AliasSetupFrame ();
if (!acolormap)
acolormap = vid.colormap8;
if (acolormap == &vid.colormap8 && r_pixbytes != 1)
{
if (r_pixbytes == 2)
acolormap = vid.colormap16;
else if (r_pixbytes == 4)
acolormap = vid.colormap32;
else
Sys_Error("R_AliasDrawmodel: unsupported r_pixbytes %i",
r_pixbytes);
}
if (currententity != r_view_model)
ziscale = (float) 0x8000 *(float) 0x10000;
else
ziscale = (float) 0x8000 *(float) 0x10000 *3.0;
if (currententity->trivial_accept && pmdl->ident != HEADER_MDL16)
R_AliasPrepareUnclippedPoints ();
else
R_AliasPreparePoints ();
if (!currententity->model->aliashdr)
Cache_Release (&currententity->model->cache);
}