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Diffstat (limited to 'apps/plugins/sdl/progs/quake/r_sprite.c')
-rw-r--r--apps/plugins/sdl/progs/quake/r_sprite.c401
1 files changed, 401 insertions, 0 deletions
diff --git a/apps/plugins/sdl/progs/quake/r_sprite.c b/apps/plugins/sdl/progs/quake/r_sprite.c
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+/*
+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 the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+*/
+// r_sprite.c
+
+#include "quakedef.h"
+#include "r_local.h"
+
+static int clip_current;
+static vec5_t clip_verts[2][MAXWORKINGVERTS];
+static int sprite_width, sprite_height;
+
+spritedesc_t r_spritedesc;
+
+
+/*
+================
+R_RotateSprite
+================
+*/
+void R_RotateSprite (float beamlength)
+{
+ vec3_t vec;
+
+ if (beamlength == 0.0)
+ return;
+
+ VectorScale (r_spritedesc.vpn, -beamlength, vec);
+ VectorAdd (r_entorigin, vec, r_entorigin);
+ VectorSubtract (modelorg, vec, modelorg);
+}
+
+
+/*
+=============
+R_ClipSpriteFace
+
+Clips the winding at clip_verts[clip_current] and changes clip_current
+Throws out the back side
+==============
+*/
+int R_ClipSpriteFace (int nump, clipplane_t *pclipplane)
+{
+ int i, outcount;
+ float dists[MAXWORKINGVERTS+1];
+ float frac, clipdist, *pclipnormal;
+ float *in, *instep, *outstep, *vert2;
+
+ clipdist = pclipplane->dist;
+ pclipnormal = pclipplane->normal;
+
+// calc dists
+ if (clip_current)
+ {
+ in = clip_verts[1][0];
+ outstep = clip_verts[0][0];
+ clip_current = 0;
+ }
+ else
+ {
+ in = clip_verts[0][0];
+ outstep = clip_verts[1][0];
+ clip_current = 1;
+ }
+
+ instep = in;
+ for (i=0 ; i<nump ; i++, instep += sizeof (vec5_t) / sizeof (float))
+ {
+ dists[i] = DotProduct (instep, pclipnormal) - clipdist;
+ }
+
+// handle wraparound case
+ dists[nump] = dists[0];
+ Q_memcpy (instep, in, sizeof (vec5_t));
+
+
+// clip the winding
+ instep = in;
+ outcount = 0;
+
+ for (i=0 ; i<nump ; i++, instep += sizeof (vec5_t) / sizeof (float))
+ {
+ if (dists[i] >= 0)
+ {
+ Q_memcpy (outstep, instep, sizeof (vec5_t));
+ outstep += sizeof (vec5_t) / sizeof (float);
+ outcount++;
+ }
+
+ if (dists[i] == 0 || dists[i+1] == 0)
+ continue;
+
+ if ( (dists[i] > 0) == (dists[i+1] > 0) )
+ continue;
+
+ // split it into a new vertex
+ frac = dists[i] / (dists[i] - dists[i+1]);
+
+ vert2 = instep + sizeof (vec5_t) / sizeof (float);
+
+ outstep[0] = instep[0] + frac*(vert2[0] - instep[0]);
+ outstep[1] = instep[1] + frac*(vert2[1] - instep[1]);
+ outstep[2] = instep[2] + frac*(vert2[2] - instep[2]);
+ outstep[3] = instep[3] + frac*(vert2[3] - instep[3]);
+ outstep[4] = instep[4] + frac*(vert2[4] - instep[4]);
+
+ outstep += sizeof (vec5_t) / sizeof (float);
+ outcount++;
+ }
+
+ return outcount;
+}
+
+
+/*
+================
+R_SetupAndDrawSprite
+================
+*/
+void R_SetupAndDrawSprite ()
+{
+ int i, nump;
+ float dot, scale, *pv;
+ vec5_t *pverts;
+ vec3_t left, up, right, down, transformed, local;
+ emitpoint_t outverts[MAXWORKINGVERTS+1], *pout;
+
+ dot = DotProduct (r_spritedesc.vpn, modelorg);
+
+// backface cull
+ if (dot >= 0)
+ return;
+
+// build the sprite poster in worldspace
+ VectorScale (r_spritedesc.vright, r_spritedesc.pspriteframe->right, right);
+ VectorScale (r_spritedesc.vup, r_spritedesc.pspriteframe->up, up);
+ VectorScale (r_spritedesc.vright, r_spritedesc.pspriteframe->left, left);
+ VectorScale (r_spritedesc.vup, r_spritedesc.pspriteframe->down, down);
+
+ pverts = clip_verts[0];
+
+ pverts[0][0] = r_entorigin[0] + up[0] + left[0];
+ pverts[0][1] = r_entorigin[1] + up[1] + left[1];
+ pverts[0][2] = r_entorigin[2] + up[2] + left[2];
+ pverts[0][3] = 0;
+ pverts[0][4] = 0;
+
+ pverts[1][0] = r_entorigin[0] + up[0] + right[0];
+ pverts[1][1] = r_entorigin[1] + up[1] + right[1];
+ pverts[1][2] = r_entorigin[2] + up[2] + right[2];
+ pverts[1][3] = sprite_width;
+ pverts[1][4] = 0;
+
+ pverts[2][0] = r_entorigin[0] + down[0] + right[0];
+ pverts[2][1] = r_entorigin[1] + down[1] + right[1];
+ pverts[2][2] = r_entorigin[2] + down[2] + right[2];
+ pverts[2][3] = sprite_width;
+ pverts[2][4] = sprite_height;
+
+ pverts[3][0] = r_entorigin[0] + down[0] + left[0];
+ pverts[3][1] = r_entorigin[1] + down[1] + left[1];
+ pverts[3][2] = r_entorigin[2] + down[2] + left[2];
+ pverts[3][3] = 0;
+ pverts[3][4] = sprite_height;
+
+// clip to the frustum in worldspace
+ nump = 4;
+ clip_current = 0;
+
+ for (i=0 ; i<4 ; i++)
+ {
+ nump = R_ClipSpriteFace (nump, &view_clipplanes[i]);
+ if (nump < 3)
+ return;
+ if (nump >= MAXWORKINGVERTS)
+ Sys_Error("R_SetupAndDrawSprite: too many points");
+ }
+
+// transform vertices into viewspace and project
+ pv = &clip_verts[clip_current][0][0];
+ r_spritedesc.nearzi = -999999;
+
+ for (i=0 ; i<nump ; i++)
+ {
+ VectorSubtract (pv, r_origin, local);
+ TransformVector (local, transformed);
+
+ if (transformed[2] < NEAR_CLIP)
+ transformed[2] = NEAR_CLIP;
+
+ pout = &outverts[i];
+ pout->zi = 1.0 / transformed[2];
+ if (pout->zi > r_spritedesc.nearzi)
+ r_spritedesc.nearzi = pout->zi;
+
+ pout->s = pv[3];
+ pout->t = pv[4];
+
+ scale = xscale * pout->zi;
+ pout->u = (xcenter + scale * transformed[0]);
+
+ scale = yscale * pout->zi;
+ pout->v = (ycenter - scale * transformed[1]);
+
+ pv += sizeof (vec5_t) / sizeof (*pv);
+ }
+
+// draw it
+ r_spritedesc.nump = nump;
+ r_spritedesc.pverts = outverts;
+ D_DrawSprite ();
+}
+
+
+/*
+================
+R_GetSpriteframe
+================
+*/
+mspriteframe_t *R_GetSpriteframe (msprite_t *psprite)
+{
+ mspritegroup_t *pspritegroup;
+ mspriteframe_t *pspriteframe;
+ int i, numframes, frame;
+ float *pintervals, fullinterval, targettime, time;
+
+ frame = currententity->frame;
+
+ if ((frame >= psprite->numframes) || (frame < 0))
+ {
+ Con_Printf ("R_DrawSprite: no such frame %d\n", frame);
+ frame = 0;
+ }
+
+ if (psprite->frames[frame].type == SPR_SINGLE)
+ {
+ pspriteframe = psprite->frames[frame].frameptr;
+ }
+ else
+ {
+ pspritegroup = (mspritegroup_t *)psprite->frames[frame].frameptr;
+ pintervals = pspritegroup->intervals;
+ numframes = pspritegroup->numframes;
+ fullinterval = pintervals[numframes-1];
+
+ time = cl.time + currententity->syncbase;
+
+ // when loading in Mod_LoadSpriteGroup, we guaranteed all interval values
+ // are positive, so we don't have to worry about division by 0
+ targettime = time - ((int)(time / fullinterval)) * fullinterval;
+
+ for (i=0 ; i<(numframes-1) ; i++)
+ {
+ if (pintervals[i] > targettime)
+ break;
+ }
+
+ pspriteframe = pspritegroup->frames[i];
+ }
+
+ return pspriteframe;
+}
+
+
+/*
+================
+R_DrawSprite
+================
+*/
+void R_DrawSprite (void)
+{
+ int i;
+ msprite_t *psprite;
+ vec3_t tvec;
+ float dot, angle, sr, cr;
+
+ psprite = currententity->model->cache.data;
+
+ r_spritedesc.pspriteframe = R_GetSpriteframe (psprite);
+
+ sprite_width = r_spritedesc.pspriteframe->width;
+ sprite_height = r_spritedesc.pspriteframe->height;
+
+// TODO: make this caller-selectable
+ if (psprite->type == SPR_FACING_UPRIGHT)
+ {
+ // generate the sprite's axes, with vup straight up in worldspace, and
+ // r_spritedesc.vright perpendicular to modelorg.
+ // This will not work if the view direction is very close to straight up or
+ // down, because the cross product will be between two nearly parallel
+ // vectors and starts to approach an undefined state, so we don't draw if
+ // the two vectors are less than 1 degree apart
+ tvec[0] = -modelorg[0];
+ tvec[1] = -modelorg[1];
+ tvec[2] = -modelorg[2];
+ VectorNormalize (tvec);
+ dot = tvec[2]; // same as DotProduct (tvec, r_spritedesc.vup) because
+ // r_spritedesc.vup is 0, 0, 1
+ if ((dot > 0.999848) || (dot < -0.999848)) // cos(1 degree) = 0.999848
+ return;
+ r_spritedesc.vup[0] = 0;
+ r_spritedesc.vup[1] = 0;
+ r_spritedesc.vup[2] = 1;
+ r_spritedesc.vright[0] = tvec[1];
+ // CrossProduct(r_spritedesc.vup, -modelorg,
+ r_spritedesc.vright[1] = -tvec[0];
+ // r_spritedesc.vright)
+ r_spritedesc.vright[2] = 0;
+ VectorNormalize (r_spritedesc.vright);
+ r_spritedesc.vpn[0] = -r_spritedesc.vright[1];
+ r_spritedesc.vpn[1] = r_spritedesc.vright[0];
+ r_spritedesc.vpn[2] = 0;
+ // CrossProduct (r_spritedesc.vright, r_spritedesc.vup,
+ // r_spritedesc.vpn)
+ }
+ else if (psprite->type == SPR_VP_PARALLEL)
+ {
+ // generate the sprite's axes, completely parallel to the viewplane. There
+ // are no problem situations, because the sprite is always in the same
+ // position relative to the viewer
+ for (i=0 ; i<3 ; i++)
+ {
+ r_spritedesc.vup[i] = vup[i];
+ r_spritedesc.vright[i] = vright[i];
+ r_spritedesc.vpn[i] = vpn[i];
+ }
+ }
+ else if (psprite->type == SPR_VP_PARALLEL_UPRIGHT)
+ {
+ // generate the sprite's axes, with vup straight up in worldspace, and
+ // r_spritedesc.vright parallel to the viewplane.
+ // This will not work if the view direction is very close to straight up or
+ // down, because the cross product will be between two nearly parallel
+ // vectors and starts to approach an undefined state, so we don't draw if
+ // the two vectors are less than 1 degree apart
+ dot = vpn[2]; // same as DotProduct (vpn, r_spritedesc.vup) because
+ // r_spritedesc.vup is 0, 0, 1
+ if ((dot > 0.999848) || (dot < -0.999848)) // cos(1 degree) = 0.999848
+ return;
+ r_spritedesc.vup[0] = 0;
+ r_spritedesc.vup[1] = 0;
+ r_spritedesc.vup[2] = 1;
+ r_spritedesc.vright[0] = vpn[1];
+ // CrossProduct (r_spritedesc.vup, vpn,
+ r_spritedesc.vright[1] = -vpn[0]; // r_spritedesc.vright)
+ r_spritedesc.vright[2] = 0;
+ VectorNormalize (r_spritedesc.vright);
+ r_spritedesc.vpn[0] = -r_spritedesc.vright[1];
+ r_spritedesc.vpn[1] = r_spritedesc.vright[0];
+ r_spritedesc.vpn[2] = 0;
+ // CrossProduct (r_spritedesc.vright, r_spritedesc.vup,
+ // r_spritedesc.vpn)
+ }
+ else if (psprite->type == SPR_ORIENTED)
+ {
+ // generate the sprite's axes, according to the sprite's world orientation
+ AngleVectors (currententity->angles, r_spritedesc.vpn,
+ r_spritedesc.vright, r_spritedesc.vup);
+ }
+ else if (psprite->type == SPR_VP_PARALLEL_ORIENTED)
+ {
+ // generate the sprite's axes, parallel to the viewplane, but rotated in
+ // that plane around the center according to the sprite entity's roll
+ // angle. So vpn stays the same, but vright and vup rotate
+ angle = currententity->angles[ROLL] * (M_PI*2 / 360);
+ sr = sin(angle);
+ cr = cos(angle);
+
+ for (i=0 ; i<3 ; i++)
+ {
+ r_spritedesc.vpn[i] = vpn[i];
+ r_spritedesc.vright[i] = vright[i] * cr + vup[i] * sr;
+ r_spritedesc.vup[i] = vright[i] * -sr + vup[i] * cr;
+ }
+ }
+ else
+ {
+ Sys_Error ("R_DrawSprite: Bad sprite type %d", psprite->type);
+ }
+
+ R_RotateSprite (psprite->beamlength);
+
+ R_SetupAndDrawSprite ();
+}
+
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