mirror of https://github.com/FWGS/xash3d-fwgs
387 lines
9.0 KiB
C
387 lines
9.0 KiB
C
/*
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Copyright (C) 1997-2001 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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// r_misc.c
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#include "r_local.h"
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#define NUM_MIPS 4
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surfcache_t *d_initial_rover;
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qboolean d_roverwrapped;
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int d_minmip;
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float d_scalemip[NUM_MIPS-1];
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static float basemip[NUM_MIPS-1] = {1.0, 0.5*0.8, 0.25*0.8};
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//int d_vrectx, d_vrecty, d_vrectright_particle, d_vrectbottom_particle;
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//int d_pix_min, d_pix_max, d_pix_shift;
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int d_scantable[MAXHEIGHT];
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short *zspantable[MAXHEIGHT];
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struct qfrustum_s qfrustum;
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/*
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================
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D_Patch
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================
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*/
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void D_Patch (void)
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{
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#if id386
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extern void D_Aff8Patch( void );
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static qboolean protectset8 = false;
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extern void D_PolysetAff8Start( void );
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if (!protectset8)
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{
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Sys_MakeCodeWriteable ((int)D_PolysetAff8Start,
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(int)D_Aff8Patch - (int)D_PolysetAff8Start);
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Sys_MakeCodeWriteable ((long)R_Surf8Start,
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(long)R_Surf8End - (long)R_Surf8Start);
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protectset8 = true;
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}
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colormap = vid.colormap;
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R_Surf8Patch ();
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D_Aff8Patch();
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#endif
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}
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/*
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================
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D_ViewChanged
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================
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*/
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void D_ViewChanged (void)
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{
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int i;
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scale_for_mip = xscale;
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if (yscale > xscale)
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scale_for_mip = yscale;
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d_zrowbytes = vid.width * 2;
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d_zwidth = vid.width;
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/*d_pix_min = gpGlobals->width / 320;
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if (d_pix_min < 1)
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d_pix_min = 1;
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d_pix_max = (int)((float)gpGlobals->height / (320.0 / 4.0) + 0.5);
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d_pix_shift = 8 - (int)((float)gpGlobals->height / 320.0 + 0.5);
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if (d_pix_max < 1)
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d_pix_max = 1;*/
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//d_vrectx = RI.vrect.x;
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//d_vrecty = RI.vrect.y;
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//d_vrectright_particle = gpGlobals->width - d_pix_max;
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//d_vrectbottom_particle =
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// gpGlobals->height - d_pix_max;
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for (i=0 ; i<vid.height; i++)
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{
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d_scantable[i] = i*r_screenwidth;
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zspantable[i] = d_pzbuffer + i*d_zwidth;
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}
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/*
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** clear Z-buffer and color-buffers if we're doing the gallery
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*/
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if ( !RI.drawWorld )
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{
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memset( d_pzbuffer, 0xff, vid.width * vid.height * sizeof( d_pzbuffer[0] ) );
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}
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D_Patch ();
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}
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/*
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===================
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R_TransformFrustum
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===================
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*/
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void R_TransformFrustum (void)
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{
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int i;
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vec3_t v, v2;
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for (i=0 ; i<4 ; i++)
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{
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v[0] = qfrustum.screenedge[i].normal[2];
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v[1] = -qfrustum.screenedge[i].normal[0];
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v[2] = qfrustum.screenedge[i].normal[1];
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v2[0] = v[1]*RI.vright[0] + v[2]*RI.vup[0] + v[0]*RI.vforward[0];
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v2[1] = v[1]*RI.vright[1] + v[2]*RI.vup[1] + v[0]*RI.vforward[1];
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v2[2] = v[1]*RI.vright[2] + v[2]*RI.vup[2] + v[0]*RI.vforward[2];
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VectorCopy (v2, qfrustum.view_clipplanes[i].normal);
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qfrustum.view_clipplanes[i].dist = DotProduct (tr.modelorg, v2);
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}
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}
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/*
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================
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TransformVector
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================
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*/
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void TransformVector (vec3_t in, vec3_t out)
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{
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out[0] = DotProduct(in,RI.vright);
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out[1] = DotProduct(in,RI.vup);
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out[2] = DotProduct(in,RI.vforward);
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}
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/*
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===============
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R_SetUpFrustumIndexes
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===============
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*/
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void R_SetUpFrustumIndexes (void)
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{
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int i, j, *pindex;
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pindex = qfrustum.frustum_indexes;
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for (i=0 ; i<4 ; i++)
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{
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for (j=0 ; j<3 ; j++)
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{
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if (qfrustum.view_clipplanes[i].normal[j] < 0)
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{
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pindex[j] = j;
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pindex[j+3] = j+3;
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}
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else
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{
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pindex[j] = j+3;
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pindex[j+3] = j;
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}
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}
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// FIXME: do just once at start
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qfrustum.pfrustum_indexes[i] = pindex;
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pindex += 6;
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}
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}
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/*
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===============
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R_ViewChanged
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Called every time the vid structure or r_refdef changes.
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Guaranteed to be called before the first refresh
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===============
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*/
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void R_ViewChanged (vrect_t *vr)
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{
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int i;
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float verticalFieldOfView, horizontalFieldOfView, xOrigin, yOrigin;
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RI.vrect = *vr;
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horizontalFieldOfView = 2*tan((float)RI.fov_x/360.0f * M_PI_F);
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verticalFieldOfView = 2*tan((float)RI.fov_y/360.0f * M_PI_F);
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RI.fvrectx = (float)RI.vrect.x;
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RI.fvrectx_adj = (float)RI.vrect.x - 0.5f;
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RI.vrect_x_adj_shift20 = (RI.vrect.x<<20) + (1<<19) - 1;
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RI.fvrecty = (float)RI.vrect.y;
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RI.fvrecty_adj = (float)RI.vrect.y - 0.5f;
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RI.vrectright = RI.vrect.x + RI.vrect.width;
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RI.vrectright_adj_shift20 = (RI.vrectright<<20) + (1<<19) - 1;
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RI.fvrectright = (float)RI.vrectright;
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RI.fvrectright_adj = (float)RI.vrectright - 0.5f;
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RI.vrectrightedge = (float)RI.vrectright - 0.99f;
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RI.vrectbottom = RI.vrect.y + RI.vrect.height;
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RI.fvrectbottom = (float)RI.vrectbottom;
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RI.fvrectbottom_adj = (float)RI.vrectbottom - 0.5f;
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RI.aliasvrect.x = (int)(RI.vrect.x * r_aliasuvscale);
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RI.aliasvrect.y = (int)(RI.vrect.y * r_aliasuvscale);
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RI.aliasvrect.width = (int)(RI.vrect.width * r_aliasuvscale);
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RI.aliasvrect.height = (int)(RI.vrect.height * r_aliasuvscale);
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RI.aliasvrectright = RI.aliasvrect.x +
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RI.aliasvrect.width;
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RI.aliasvrectbottom = RI.aliasvrect.y +
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RI.aliasvrect.height;
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xOrigin = XCENTERING;
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yOrigin = YCENTERING;
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#define PLANE_ANYZ 5
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// values for perspective projection
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// if math were exact, the values would range from 0.5 to to range+0.5
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// hopefully they wll be in the 0.000001 to range+.999999 and truncate
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// the polygon rasterization will never render in the first row or column
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// but will definately render in the [range] row and column, so adjust the
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// buffer origin to get an exact edge to edge fill
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xcenter = ((float)RI.vrect.width * XCENTERING) +
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RI.vrect.x - 0.5f;
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aliasxcenter = xcenter * r_aliasuvscale;
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ycenter = ((float)RI.vrect.height * YCENTERING) +
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RI.vrect.y - 0.5f;
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aliasycenter = ycenter * r_aliasuvscale;
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xscale = RI.vrect.width / horizontalFieldOfView;
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aliasxscale = xscale * r_aliasuvscale;
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xscaleinv = 1.0f / xscale;
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yscale = xscale;
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aliasyscale = yscale * r_aliasuvscale;
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yscaleinv = 1.0f / yscale;
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//xscaleshrink = (RI.vrect.width-6)/RI.horizontalFieldOfView;
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//yscaleshrink = xscaleshrink;
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// left side clip
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qfrustum.screenedge[0].normal[0] = -1.0f / (xOrigin*horizontalFieldOfView);
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qfrustum.screenedge[0].normal[1] = 0;
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qfrustum.screenedge[0].normal[2] = 1;
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qfrustum.screenedge[0].type = PLANE_ANYZ;
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// right side clip
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qfrustum.screenedge[1].normal[0] =
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1.0f / ((1.0f-xOrigin)*horizontalFieldOfView);
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qfrustum.screenedge[1].normal[1] = 0;
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qfrustum.screenedge[1].normal[2] = 1;
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qfrustum.screenedge[1].type = PLANE_ANYZ;
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// top side clip
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qfrustum.screenedge[2].normal[0] = 0;
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qfrustum.screenedge[2].normal[1] = -1.0f / (yOrigin*verticalFieldOfView);
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qfrustum.screenedge[2].normal[2] = 1;
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qfrustum.screenedge[2].type = PLANE_ANYZ;
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// bottom side clip
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qfrustum.screenedge[3].normal[0] = 0;
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qfrustum.screenedge[3].normal[1] = 1.0f / ((1.0f-yOrigin)*verticalFieldOfView);
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qfrustum.screenedge[3].normal[2] = 1;
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qfrustum.screenedge[3].type = PLANE_ANYZ;
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for (i=0 ; i<4 ; i++)
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VectorNormalize (qfrustum.screenedge[i].normal);
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D_ViewChanged ();
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}
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/*
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===============
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R_SetupFrame
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===============
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*/
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void R_SetupFrameQ (void)
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{
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int i;
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vrect_t vrect;
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if (r_fullbright->flags & FCVAR_CHANGED)
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{
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r_fullbright->flags &= ~FCVAR_CHANGED;
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D_FlushCaches( ); // so all lighting changes
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}
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//tr.framecount++;
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// build the transformation matrix for the given view angles
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VectorCopy (RI.vieworg, tr.modelorg);
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//AngleVectors (RI.viewangles, RI.vforward, RI.vright, RI.vup);
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// current viewleaf
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if ( RI.drawWorld )
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{
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RI.viewleaf = gEngfuncs.Mod_PointInLeaf (RI.vieworg, WORLDMODEL->nodes);
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r_viewcluster = RI.viewleaf->cluster;
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}
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// if (sw_waterwarp->value && (r_newrefdef.rdflags & RDF_UNDERWATER) )
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// r_dowarp = true;
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// else
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/*vrect.x = 0;//r_newrefdef.x;
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vrect.y = 0;//r_newrefdef.y;
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vrect.width = gpGlobals->width;
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vrect.height = gpGlobals->height;*/
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vrect.x = RI.viewport[0];
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vrect.y = RI.viewport[1];
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vrect.width = RI.viewport[2];
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vrect.height = RI.viewport[3];
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d_viewbuffer = (void *)vid.buffer;
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r_screenwidth = vid.rowbytes;
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R_ViewChanged (&vrect);
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// start off with just the four screen edge clip planes
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R_TransformFrustum ();
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R_SetUpFrustumIndexes ();
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// save base values
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VectorCopy (RI.vforward, RI.base_vpn);
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VectorCopy (RI.vright, RI.base_vright);
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VectorCopy (RI.vup, RI.base_vup);
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// clear frame counts
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/* c_faceclip = 0;
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d_spanpixcount = 0;
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r_polycount = 0;
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r_drawnpolycount = 0;
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r_wholepolycount = 0;
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r_amodels_drawn = 0;
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r_outofsurfaces = 0;
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r_outofedges = 0;*/
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// d_setup
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d_roverwrapped = false;
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d_initial_rover = sc_rover;
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d_minmip = sw_mipcap.value;
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if (d_minmip > 3)
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d_minmip = 3;
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else if (d_minmip < 0)
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d_minmip = 0;
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for (i=0 ; i<(NUM_MIPS-1) ; i++)
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d_scalemip[i] = basemip[i] * sw_mipscale.value;
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//d_aflatcolor = 0;
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}
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#if !id386
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/*
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================
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R_SurfacePatch
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================
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*/
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/*void R_SurfacePatch (void)
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{
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// we only patch code on Intel
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}
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*/
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#endif // !id386
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