Initial import.

1 files changed, 419 insertions, 0 deletions

diff --git a/src/renderer/tr_mesh.c b/src/renderer/tr_mesh.c
new file mode 100644
index 0000000..38c58ed
--- /dev/null
+++ b/src/renderer/tr_mesh.c
@@ -0,0 +1,419 @@
+/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+Copyright (C) 2000-2009 Darklegion Development
+
+This file is part of Tremulous.
+
+Tremulous 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.
+
+Tremulous 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 Tremulous; 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 );
+	}
+
+}
+