mirror of
https://github.com/Q3Rally-Team/rallyunlimited-engine.git
synced 2024-11-10 07:22:08 +00:00
344 lines
7.9 KiB
C
344 lines
7.9 KiB
C
/*
|
|
===========================================================================
|
|
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
|
|
===========================================================================
|
|
*/
|
|
#include "tr_local.h"
|
|
|
|
|
|
/*
|
|
|
|
for a projection shadow:
|
|
|
|
point[x] += light vector * ( z - shadow plane )
|
|
point[y] +=
|
|
point[z] = shadow plane
|
|
|
|
1 0 light[x] / light[z]
|
|
|
|
*/
|
|
|
|
typedef struct {
|
|
int i2;
|
|
int facing;
|
|
} edgeDef_t;
|
|
|
|
#define MAX_EDGE_DEFS 32
|
|
|
|
static edgeDef_t edgeDefs[SHADER_MAX_VERTEXES][MAX_EDGE_DEFS];
|
|
static int numEdgeDefs[SHADER_MAX_VERTEXES];
|
|
static int facing[SHADER_MAX_INDEXES/3];
|
|
|
|
static void R_AddEdgeDef( int i1, int i2, int f ) {
|
|
int c;
|
|
|
|
c = numEdgeDefs[ i1 ];
|
|
if ( c == MAX_EDGE_DEFS ) {
|
|
return; // overflow
|
|
}
|
|
edgeDefs[ i1 ][ c ].i2 = i2;
|
|
edgeDefs[ i1 ][ c ].facing = f;
|
|
|
|
numEdgeDefs[ i1 ]++;
|
|
}
|
|
|
|
|
|
static void R_CalcShadowEdges( void ) {
|
|
qboolean sil_edge;
|
|
int i;
|
|
int c, c2;
|
|
int j, k;
|
|
int i2;
|
|
|
|
tess.numIndexes = 0;
|
|
|
|
// an edge is NOT a silhouette edge if its face doesn't face the light,
|
|
// or if it has a reverse paired edge that also faces the light.
|
|
// A well behaved polyhedron would have exactly two faces for each edge,
|
|
// but lots of models have dangling edges or overfanned edges
|
|
for ( i = 0; i < tess.numVertexes; i++ ) {
|
|
c = numEdgeDefs[ i ];
|
|
for ( j = 0 ; j < c ; j++ ) {
|
|
if ( !edgeDefs[ i ][ j ].facing ) {
|
|
continue;
|
|
}
|
|
|
|
sil_edge = qtrue;
|
|
i2 = edgeDefs[ i ][ j ].i2;
|
|
c2 = numEdgeDefs[ i2 ];
|
|
for ( k = 0 ; k < c2 ; k++ ) {
|
|
if ( edgeDefs[ i2 ][ k ].i2 == i && edgeDefs[ i2 ][ k ].facing ) {
|
|
sil_edge = qfalse;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// if it doesn't share the edge with another front facing
|
|
// triangle, it is a sil edge
|
|
if ( sil_edge ) {
|
|
if ( tess.numIndexes > ARRAY_LEN( tess.indexes ) - 6 ) {
|
|
i = tess.numVertexes;
|
|
break;
|
|
}
|
|
tess.indexes[ tess.numIndexes + 0 ] = i;
|
|
tess.indexes[ tess.numIndexes + 1 ] = i + tess.numVertexes;
|
|
tess.indexes[ tess.numIndexes + 2 ] = i2;
|
|
tess.indexes[ tess.numIndexes + 3 ] = i2;
|
|
tess.indexes[ tess.numIndexes + 4 ] = i + tess.numVertexes;
|
|
tess.indexes[ tess.numIndexes + 5 ] = i2 + tess.numVertexes;
|
|
tess.numIndexes += 6;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
=================
|
|
RB_ShadowTessEnd
|
|
|
|
triangleFromEdge[ v1 ][ v2 ]
|
|
|
|
|
|
set triangle from edge( v1, v2, tri )
|
|
if ( facing[ triangleFromEdge[ v1 ][ v2 ] ] && !facing[ triangleFromEdge[ v2 ][ v1 ] ) {
|
|
}
|
|
=================
|
|
*/
|
|
void RB_ShadowTessEnd( void ) {
|
|
int i;
|
|
int numTris;
|
|
vec3_t lightDir;
|
|
GLboolean rgba[4];
|
|
|
|
if ( glConfig.stencilBits < 4 ) {
|
|
return;
|
|
}
|
|
|
|
#ifdef USE_PMLIGHT
|
|
if ( r_dlightMode->integer == 2 && r_shadows->integer == 2 )
|
|
VectorCopy( backEnd.currentEntity->shadowLightDir, lightDir );
|
|
else
|
|
#endif
|
|
VectorCopy( backEnd.currentEntity->lightDir, lightDir );
|
|
|
|
// clamp projection by height
|
|
if ( lightDir[2] > 0.1 ) {
|
|
float s = 0.1 / lightDir[2];
|
|
VectorScale( lightDir, s, lightDir );
|
|
}
|
|
|
|
// project vertexes away from light direction
|
|
for ( i = 0; i < tess.numVertexes; i++ ) {
|
|
VectorMA( tess.xyz[i], -512, lightDir, tess.xyz[i+tess.numVertexes] );
|
|
}
|
|
|
|
// decide which triangles face the light
|
|
Com_Memset( numEdgeDefs, 0, tess.numVertexes * sizeof( numEdgeDefs[0] ) );
|
|
|
|
numTris = tess.numIndexes / 3;
|
|
for ( i = 0 ; i < numTris ; i++ ) {
|
|
int i1, i2, i3;
|
|
vec3_t d1, d2, normal;
|
|
float *v1, *v2, *v3;
|
|
float d;
|
|
|
|
i1 = tess.indexes[ i*3 + 0 ];
|
|
i2 = tess.indexes[ i*3 + 1 ];
|
|
i3 = tess.indexes[ i*3 + 2 ];
|
|
|
|
v1 = tess.xyz[ i1 ];
|
|
v2 = tess.xyz[ i2 ];
|
|
v3 = tess.xyz[ i3 ];
|
|
|
|
VectorSubtract( v2, v1, d1 );
|
|
VectorSubtract( v3, v1, d2 );
|
|
CrossProduct( d1, d2, normal );
|
|
|
|
d = DotProduct( normal, lightDir );
|
|
if ( d > 0 ) {
|
|
facing[ i ] = 1;
|
|
} else {
|
|
facing[ i ] = 0;
|
|
}
|
|
|
|
// create the edges
|
|
R_AddEdgeDef( i1, i2, facing[ i ] );
|
|
R_AddEdgeDef( i2, i3, facing[ i ] );
|
|
R_AddEdgeDef( i3, i1, facing[ i ] );
|
|
}
|
|
|
|
R_CalcShadowEdges();
|
|
|
|
GL_ClientState( 1, CLS_NONE );
|
|
GL_ClientState( 0, CLS_NONE );
|
|
|
|
qglVertexPointer( 3, GL_FLOAT, sizeof( tess.xyz[0] ), tess.xyz );
|
|
|
|
if ( qglLockArraysEXT )
|
|
qglLockArraysEXT( 0, tess.numVertexes*2 );
|
|
|
|
// draw the silhouette edges
|
|
|
|
qglDisable( GL_TEXTURE_2D );
|
|
//GL_Bind( tr.whiteImage );
|
|
GL_State( GLS_SRCBLEND_ONE | GLS_DSTBLEND_ZERO );
|
|
qglColor4f( 0.2f, 0.2f, 0.2f, 1.0f );
|
|
|
|
// don't write to the color buffer
|
|
qglGetBooleanv( GL_COLOR_WRITEMASK, rgba );
|
|
qglColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE );
|
|
|
|
qglEnable( GL_STENCIL_TEST );
|
|
qglStencilFunc( GL_ALWAYS, 1, 255 );
|
|
|
|
GL_Cull( CT_BACK_SIDED );
|
|
qglStencilOp( GL_KEEP, GL_KEEP, GL_INCR );
|
|
|
|
R_DrawElements( tess.numIndexes, tess.indexes );
|
|
|
|
GL_Cull( CT_FRONT_SIDED );
|
|
qglStencilOp( GL_KEEP, GL_KEEP, GL_DECR );
|
|
|
|
R_DrawElements( tess.numIndexes, tess.indexes );
|
|
|
|
if ( qglUnlockArraysEXT )
|
|
qglUnlockArraysEXT();
|
|
|
|
// re-enable writing to the color buffer
|
|
qglColorMask(rgba[0], rgba[1], rgba[2], rgba[3]);
|
|
|
|
qglEnable( GL_TEXTURE_2D );
|
|
|
|
backEnd.doneShadows = qtrue;
|
|
|
|
tess.numIndexes = 0;
|
|
}
|
|
|
|
|
|
/*
|
|
=================
|
|
RB_ShadowFinish
|
|
|
|
Darken everything that is is a shadow volume.
|
|
We have to delay this until everything has been shadowed,
|
|
because otherwise shadows from different body parts would
|
|
overlap and double darken.
|
|
=================
|
|
*/
|
|
void RB_ShadowFinish( void ) {
|
|
|
|
static const vec3_t verts[4] = {
|
|
{ -100, 100, -10 },
|
|
{ 100, 100, -10 },
|
|
{ -100,-100, -10 },
|
|
{ 100,-100, -10 }
|
|
};
|
|
|
|
if ( !backEnd.doneShadows ) {
|
|
return;
|
|
}
|
|
|
|
backEnd.doneShadows = qfalse;
|
|
|
|
if ( r_shadows->integer != 2 ) {
|
|
return;
|
|
}
|
|
if ( glConfig.stencilBits < 4 ) {
|
|
return;
|
|
}
|
|
|
|
qglEnable( GL_STENCIL_TEST );
|
|
qglStencilFunc( GL_NOTEQUAL, 0, 255 );
|
|
|
|
qglDisable( GL_CLIP_PLANE0 );
|
|
GL_Cull( CT_TWO_SIDED );
|
|
|
|
qglDisable( GL_TEXTURE_2D );
|
|
|
|
qglLoadIdentity();
|
|
|
|
qglColor4f( 0.6f, 0.6f, 0.6f, 1 );
|
|
GL_State( GLS_DEPTHMASK_TRUE | GLS_SRCBLEND_DST_COLOR | GLS_DSTBLEND_ZERO );
|
|
|
|
//qglColor4f( 1, 0, 0, 1 );
|
|
//GL_State( GLS_DEPTHMASK_TRUE | GLS_SRCBLEND_ONE | GLS_DSTBLEND_ZERO );
|
|
|
|
GL_ClientState( 0, CLS_NONE );
|
|
qglVertexPointer( 3, GL_FLOAT, 0, verts );
|
|
qglDrawArrays( GL_TRIANGLE_STRIP, 0, 4 );
|
|
|
|
qglColor4f( 1, 1, 1, 1 );
|
|
qglDisable( GL_STENCIL_TEST );
|
|
|
|
qglEnable( GL_TEXTURE_2D );
|
|
}
|
|
|
|
|
|
/*
|
|
=================
|
|
RB_ProjectionShadowDeform
|
|
|
|
=================
|
|
*/
|
|
void RB_ProjectionShadowDeform( void ) {
|
|
float *xyz;
|
|
int i;
|
|
float h;
|
|
vec3_t ground;
|
|
vec3_t light;
|
|
float groundDist;
|
|
float d;
|
|
vec3_t lightDir;
|
|
|
|
xyz = ( float * ) tess.xyz;
|
|
|
|
ground[0] = backEnd.or.axis[0][2];
|
|
ground[1] = backEnd.or.axis[1][2];
|
|
ground[2] = backEnd.or.axis[2][2];
|
|
|
|
groundDist = backEnd.or.origin[2] - backEnd.currentEntity->e.shadowPlane;
|
|
|
|
#ifdef USE_PMLIGHT
|
|
if ( r_dlightMode->integer == 2 && r_shadows->integer == 2 )
|
|
VectorCopy( backEnd.currentEntity->shadowLightDir, lightDir );
|
|
else
|
|
#endif
|
|
VectorCopy( backEnd.currentEntity->lightDir, lightDir );
|
|
|
|
d = DotProduct( lightDir, ground );
|
|
// don't let the shadows get too long or go negative
|
|
if ( d < 0.5 ) {
|
|
VectorMA( lightDir, (0.5 - d), ground, lightDir );
|
|
d = DotProduct( lightDir, ground );
|
|
}
|
|
d = 1.0 / d;
|
|
|
|
light[0] = lightDir[0] * d;
|
|
light[1] = lightDir[1] * d;
|
|
light[2] = lightDir[2] * d;
|
|
|
|
for ( i = 0; i < tess.numVertexes; i++, xyz += 4 ) {
|
|
h = DotProduct( xyz, ground ) + groundDist;
|
|
|
|
xyz[0] -= light[0] * h;
|
|
xyz[1] -= light[1] * h;
|
|
xyz[2] -= light[2] * h;
|
|
}
|
|
}
|