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-rw-r--r--code/renderer/tr_mesh.c418
1 files changed, 418 insertions, 0 deletions
diff --git a/code/renderer/tr_mesh.c b/code/renderer/tr_mesh.c
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+/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+
+This file is part of Quake III Arena source code.
+
+Quake III Arena source code 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.
+
+Quake III Arena source code 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 Quake III Arena source code; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+===========================================================================
+*/
+// tr_mesh.c: triangle model functions
+
+#include "tr_local.h"
+
+static float ProjectRadius( float r, vec3_t location )
+{
+ float pr;
+ float dist;
+ float c;
+ vec3_t p;
+ float projected[4];
+
+ c = DotProduct( tr.viewParms.or.axis[0], tr.viewParms.or.origin );
+ dist = DotProduct( tr.viewParms.or.axis[0], location ) - c;
+
+ if ( dist <= 0 )
+ return 0;
+
+ p[0] = 0;
+ p[1] = fabs( r );
+ p[2] = -dist;
+
+ projected[0] = p[0] * tr.viewParms.projectionMatrix[0] +
+ p[1] * tr.viewParms.projectionMatrix[4] +
+ p[2] * tr.viewParms.projectionMatrix[8] +
+ tr.viewParms.projectionMatrix[12];
+
+ projected[1] = p[0] * tr.viewParms.projectionMatrix[1] +
+ p[1] * tr.viewParms.projectionMatrix[5] +
+ p[2] * tr.viewParms.projectionMatrix[9] +
+ tr.viewParms.projectionMatrix[13];
+
+ projected[2] = p[0] * tr.viewParms.projectionMatrix[2] +
+ p[1] * tr.viewParms.projectionMatrix[6] +
+ p[2] * tr.viewParms.projectionMatrix[10] +
+ tr.viewParms.projectionMatrix[14];
+
+ projected[3] = p[0] * tr.viewParms.projectionMatrix[3] +
+ p[1] * tr.viewParms.projectionMatrix[7] +
+ p[2] * tr.viewParms.projectionMatrix[11] +
+ tr.viewParms.projectionMatrix[15];
+
+
+ pr = projected[1] / projected[3];
+
+ if ( pr > 1.0f )
+ pr = 1.0f;
+
+ return pr;
+}
+
+/*
+=============
+R_CullModel
+=============
+*/
+static int R_CullModel( md3Header_t *header, trRefEntity_t *ent ) {
+ vec3_t bounds[2];
+ md3Frame_t *oldFrame, *newFrame;
+ int i;
+
+ // compute frame pointers
+ newFrame = ( md3Frame_t * ) ( ( byte * ) header + header->ofsFrames ) + ent->e.frame;
+ oldFrame = ( md3Frame_t * ) ( ( byte * ) header + header->ofsFrames ) + ent->e.oldframe;
+
+ // cull bounding sphere ONLY if this is not an upscaled entity
+ if ( !ent->e.nonNormalizedAxes )
+ {
+ if ( ent->e.frame == ent->e.oldframe )
+ {
+ switch ( R_CullLocalPointAndRadius( newFrame->localOrigin, newFrame->radius ) )
+ {
+ case CULL_OUT:
+ tr.pc.c_sphere_cull_md3_out++;
+ return CULL_OUT;
+
+ case CULL_IN:
+ tr.pc.c_sphere_cull_md3_in++;
+ return CULL_IN;
+
+ case CULL_CLIP:
+ tr.pc.c_sphere_cull_md3_clip++;
+ break;
+ }
+ }
+ else
+ {
+ int sphereCull, sphereCullB;
+
+ sphereCull = R_CullLocalPointAndRadius( newFrame->localOrigin, newFrame->radius );
+ if ( newFrame == oldFrame ) {
+ sphereCullB = sphereCull;
+ } else {
+ sphereCullB = R_CullLocalPointAndRadius( oldFrame->localOrigin, oldFrame->radius );
+ }
+
+ if ( sphereCull == sphereCullB )
+ {
+ if ( sphereCull == CULL_OUT )
+ {
+ tr.pc.c_sphere_cull_md3_out++;
+ return CULL_OUT;
+ }
+ else if ( sphereCull == CULL_IN )
+ {
+ tr.pc.c_sphere_cull_md3_in++;
+ return CULL_IN;
+ }
+ else
+ {
+ tr.pc.c_sphere_cull_md3_clip++;
+ }
+ }
+ }
+ }
+
+ // calculate a bounding box in the current coordinate system
+ for (i = 0 ; i < 3 ; i++) {
+ bounds[0][i] = oldFrame->bounds[0][i] < newFrame->bounds[0][i] ? oldFrame->bounds[0][i] : newFrame->bounds[0][i];
+ bounds[1][i] = oldFrame->bounds[1][i] > newFrame->bounds[1][i] ? oldFrame->bounds[1][i] : newFrame->bounds[1][i];
+ }
+
+ switch ( R_CullLocalBox( bounds ) )
+ {
+ case CULL_IN:
+ tr.pc.c_box_cull_md3_in++;
+ return CULL_IN;
+ case CULL_CLIP:
+ tr.pc.c_box_cull_md3_clip++;
+ return CULL_CLIP;
+ case CULL_OUT:
+ default:
+ tr.pc.c_box_cull_md3_out++;
+ return CULL_OUT;
+ }
+}
+
+
+/*
+=================
+R_ComputeLOD
+
+=================
+*/
+int R_ComputeLOD( trRefEntity_t *ent ) {
+ float radius;
+ float flod, lodscale;
+ float projectedRadius;
+ md3Frame_t *frame;
+#ifdef RAVENMD4
+ mdrHeader_t *mdr;
+ mdrFrame_t *mdrframe;
+#endif
+ int lod;
+
+ if ( tr.currentModel->numLods < 2 )
+ {
+ // model has only 1 LOD level, skip computations and bias
+ lod = 0;
+ }
+ else
+ {
+ // multiple LODs exist, so compute projected bounding sphere
+ // and use that as a criteria for selecting LOD
+
+#ifdef RAVENMD4
+ // This is an MDR model.
+
+ if(tr.currentModel->md4)
+ {
+ int frameSize;
+ mdr = (mdrHeader_t *) tr.currentModel->md4;
+ frameSize = (size_t) (&((mdrFrame_t *)0)->bones[mdr->numBones]);
+
+ mdrframe = (mdrFrame_t *) ((byte *) mdr + mdr->ofsFrames + frameSize * ent->e.frame);
+
+ radius = RadiusFromBounds(mdrframe->bounds[0], mdrframe->bounds[1]);
+ }
+ else
+#endif
+ {
+ frame = ( md3Frame_t * ) ( ( ( unsigned char * ) tr.currentModel->md3[0] ) + tr.currentModel->md3[0]->ofsFrames );
+
+ frame += ent->e.frame;
+
+ radius = RadiusFromBounds( frame->bounds[0], frame->bounds[1] );
+ }
+
+ if ( ( projectedRadius = ProjectRadius( radius, ent->e.origin ) ) != 0 )
+ {
+ lodscale = r_lodscale->value;
+ if (lodscale > 20) lodscale = 20;
+ flod = 1.0f - projectedRadius * lodscale;
+ }
+ else
+ {
+ // object intersects near view plane, e.g. view weapon
+ flod = 0;
+ }
+
+ flod *= tr.currentModel->numLods;
+ lod = myftol( flod );
+
+ if ( lod < 0 )
+ {
+ lod = 0;
+ }
+ else if ( lod >= tr.currentModel->numLods )
+ {
+ lod = tr.currentModel->numLods - 1;
+ }
+ }
+
+ lod += r_lodbias->integer;
+
+ if ( lod >= tr.currentModel->numLods )
+ lod = tr.currentModel->numLods - 1;
+ if ( lod < 0 )
+ lod = 0;
+
+ return lod;
+}
+
+/*
+=================
+R_ComputeFogNum
+
+=================
+*/
+int R_ComputeFogNum( md3Header_t *header, trRefEntity_t *ent ) {
+ int i, j;
+ fog_t *fog;
+ md3Frame_t *md3Frame;
+ vec3_t localOrigin;
+
+ if ( tr.refdef.rdflags & RDF_NOWORLDMODEL ) {
+ return 0;
+ }
+
+ // FIXME: non-normalized axis issues
+ md3Frame = ( md3Frame_t * ) ( ( byte * ) header + header->ofsFrames ) + ent->e.frame;
+ VectorAdd( ent->e.origin, md3Frame->localOrigin, localOrigin );
+ for ( i = 1 ; i < tr.world->numfogs ; i++ ) {
+ fog = &tr.world->fogs[i];
+ for ( j = 0 ; j < 3 ; j++ ) {
+ if ( localOrigin[j] - md3Frame->radius >= fog->bounds[1][j] ) {
+ break;
+ }
+ if ( localOrigin[j] + md3Frame->radius <= fog->bounds[0][j] ) {
+ break;
+ }
+ }
+ if ( j == 3 ) {
+ return i;
+ }
+ }
+
+ return 0;
+}
+
+/*
+=================
+R_AddMD3Surfaces
+
+=================
+*/
+void R_AddMD3Surfaces( trRefEntity_t *ent ) {
+ int i;
+ md3Header_t *header = NULL;
+ md3Surface_t *surface = NULL;
+ md3Shader_t *md3Shader = NULL;
+ shader_t *shader = NULL;
+ int cull;
+ int lod;
+ int fogNum;
+ qboolean personalModel;
+
+ // don't add third_person objects if not in a portal
+ personalModel = (ent->e.renderfx & RF_THIRD_PERSON) && !tr.viewParms.isPortal;
+
+ if ( ent->e.renderfx & RF_WRAP_FRAMES ) {
+ ent->e.frame %= tr.currentModel->md3[0]->numFrames;
+ ent->e.oldframe %= tr.currentModel->md3[0]->numFrames;
+ }
+
+ //
+ // Validate the frames so there is no chance of a crash.
+ // This will write directly into the entity structure, so
+ // when the surfaces are rendered, they don't need to be
+ // range checked again.
+ //
+ if ( (ent->e.frame >= tr.currentModel->md3[0]->numFrames)
+ || (ent->e.frame < 0)
+ || (ent->e.oldframe >= tr.currentModel->md3[0]->numFrames)
+ || (ent->e.oldframe < 0) ) {
+ ri.Printf( PRINT_DEVELOPER, "R_AddMD3Surfaces: no such frame %d to %d for '%s'\n",
+ ent->e.oldframe, ent->e.frame,
+ tr.currentModel->name );
+ ent->e.frame = 0;
+ ent->e.oldframe = 0;
+ }
+
+ //
+ // compute LOD
+ //
+ lod = R_ComputeLOD( ent );
+
+ header = tr.currentModel->md3[lod];
+
+ //
+ // cull the entire model if merged bounding box of both frames
+ // is outside the view frustum.
+ //
+ cull = R_CullModel ( header, ent );
+ if ( cull == CULL_OUT ) {
+ return;
+ }
+
+ //
+ // set up lighting now that we know we aren't culled
+ //
+ if ( !personalModel || r_shadows->integer > 1 ) {
+ R_SetupEntityLighting( &tr.refdef, ent );
+ }
+
+ //
+ // see if we are in a fog volume
+ //
+ fogNum = R_ComputeFogNum( header, ent );
+
+ //
+ // draw all surfaces
+ //
+ surface = (md3Surface_t *)( (byte *)header + header->ofsSurfaces );
+ for ( i = 0 ; i < header->numSurfaces ; i++ ) {
+
+ if ( ent->e.customShader ) {
+ shader = R_GetShaderByHandle( ent->e.customShader );
+ } else if ( ent->e.customSkin > 0 && ent->e.customSkin < tr.numSkins ) {
+ skin_t *skin;
+ int j;
+
+ skin = R_GetSkinByHandle( ent->e.customSkin );
+
+ // match the surface name to something in the skin file
+ shader = tr.defaultShader;
+ for ( j = 0 ; j < skin->numSurfaces ; j++ ) {
+ // the names have both been lowercased
+ if ( !strcmp( skin->surfaces[j]->name, surface->name ) ) {
+ shader = skin->surfaces[j]->shader;
+ break;
+ }
+ }
+ if (shader == tr.defaultShader) {
+ ri.Printf( PRINT_DEVELOPER, "WARNING: no shader for surface %s in skin %s\n", surface->name, skin->name);
+ }
+ else if (shader->defaultShader) {
+ ri.Printf( PRINT_DEVELOPER, "WARNING: shader %s in skin %s not found\n", shader->name, skin->name);
+ }
+ } else if ( surface->numShaders <= 0 ) {
+ shader = tr.defaultShader;
+ } else {
+ md3Shader = (md3Shader_t *) ( (byte *)surface + surface->ofsShaders );
+ md3Shader += ent->e.skinNum % surface->numShaders;
+ shader = tr.shaders[ md3Shader->shaderIndex ];
+ }
+
+
+ // we will add shadows even if the main object isn't visible in the view
+
+ // stencil shadows can't do personal models unless I polyhedron clip
+ if ( !personalModel
+ && r_shadows->integer == 2
+ && fogNum == 0
+ && !(ent->e.renderfx & ( RF_NOSHADOW | RF_DEPTHHACK ) )
+ && shader->sort == SS_OPAQUE ) {
+ R_AddDrawSurf( (void *)surface, tr.shadowShader, 0, qfalse );
+ }
+
+ // projection shadows work fine with personal models
+ if ( r_shadows->integer == 3
+ && fogNum == 0
+ && (ent->e.renderfx & RF_SHADOW_PLANE )
+ && shader->sort == SS_OPAQUE ) {
+ R_AddDrawSurf( (void *)surface, tr.projectionShadowShader, 0, qfalse );
+ }
+
+ // don't add third_person objects if not viewing through a portal
+ if ( !personalModel ) {
+ R_AddDrawSurf( (void *)surface, shader, fogNum, qfalse );
+ }
+
+ surface = (md3Surface_t *)( (byte *)surface + surface->ofsEnd );
+ }
+
+}
+
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