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https://github.com/FWGS/xash3d-fwgs
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832 lines
18 KiB
C
832 lines
18 KiB
C
/*
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gl_warp.c - sky and water polygons
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Copyright (C) 2010 Uncle Mike
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(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. See the
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GNU General Public License for more details.
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*/
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#include "gl_local.h"
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#include "wadfile.h"
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#define SKYCLOUDS_QUALITY 12
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#define MAX_CLIP_VERTS 128 // skybox clip vertices
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#define TURBSCALE ( 256.0f / ( M_PI2 ))
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const char* r_skyBoxSuffix[6] = { "rt", "bk", "lf", "ft", "up", "dn" };
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static const int r_skyTexOrder[6] = { 0, 2, 1, 3, 4, 5 };
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static const vec3_t skyclip[6] =
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{
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{ 1, 1, 0 },
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{ 1, -1, 0 },
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{ 0, -1, 1 },
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{ 0, 1, 1 },
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{ 1, 0, 1 },
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{ -1, 0, 1 }
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};
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// 1 = s, 2 = t, 3 = 2048
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static const int st_to_vec[6][3] =
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{
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{ 3, -1, 2 },
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{ -3, 1, 2 },
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{ 1, 3, 2 },
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{ -1, -3, 2 },
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{ -2, -1, 3 }, // 0 degrees yaw, look straight up
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{ 2, -1, -3 } // look straight down
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};
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// s = [0]/[2], t = [1]/[2]
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static const int vec_to_st[6][3] =
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{
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{ -2, 3, 1 },
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{ 2, 3, -1 },
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{ 1, 3, 2 },
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{ -1, 3, -2 },
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{ -2, -1, 3 },
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{ -2, 1, -3 }
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};
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// speed up sin calculations
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float r_turbsin[] =
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{
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#include "warpsin.h"
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};
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static qboolean CheckSkybox( const char *name, char out[6][MAX_STRING] )
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{
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const char *skybox_ext[3] = { "dds", "tga", "bmp" };
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int i, j, num_checked_sides;
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char sidename[MAX_VA_STRING];
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// search for skybox images
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for( i = 0; i < 3; i++ )
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{
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// check HL-style skyboxes
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num_checked_sides = 0;
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for( j = 0; j < 6; j++ )
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{
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// build side name
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Q_snprintf( sidename, sizeof( sidename ), "%s%s.%s", name, r_skyBoxSuffix[j], skybox_ext[i] );
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if( gEngfuncs.fsapi->FileExists( sidename, false ))
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{
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Q_strncpy( out[j], sidename, sizeof( out[j] ));
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num_checked_sides++;
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}
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}
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if( num_checked_sides == 6 )
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return true; // image exists
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// check Q1-style skyboxes
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num_checked_sides = 0;
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for( j = 0; j < 6; j++ )
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{
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// build side name
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Q_snprintf( sidename, sizeof( sidename ), "%s_%s.%s", name, r_skyBoxSuffix[j], skybox_ext[i] );
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if( gEngfuncs.fsapi->FileExists( sidename, false ))
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{
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Q_strncpy( out[j], sidename, sizeof( out[j] ));
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num_checked_sides++;
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}
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}
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if( num_checked_sides == 6 )
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return true; // images exists
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}
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return false;
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}
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void DrawSkyPolygon( int nump, vec3_t vecs )
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{
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int i, j, axis;
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float s, t, dv, *vp;
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vec3_t v, av;
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// decide which face it maps to
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VectorClear( v );
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for( i = 0, vp = vecs; i < nump; i++, vp += 3 )
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VectorAdd( vp, v, v );
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av[0] = fabs( v[0] );
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av[1] = fabs( v[1] );
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av[2] = fabs( v[2] );
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if( av[0] > av[1] && av[0] > av[2] )
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axis = (v[0] < 0) ? 1 : 0;
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else if( av[1] > av[2] && av[1] > av[0] )
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axis = (v[1] < 0) ? 3 : 2;
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else axis = (v[2] < 0) ? 5 : 4;
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// project new texture coords
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for( i = 0; i < nump; i++, vecs += 3 )
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{
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j = vec_to_st[axis][2];
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dv = (j > 0) ? vecs[j-1] : -vecs[-j-1];
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if( dv == 0.0f ) continue;
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j = vec_to_st[axis][0];
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s = (j < 0) ? -vecs[-j-1] / dv : vecs[j-1] / dv;
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j = vec_to_st[axis][1];
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t = (j < 0) ? -vecs[-j-1] / dv : vecs[j-1] / dv;
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if( s < RI.skyMins[0][axis] ) RI.skyMins[0][axis] = s;
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if( t < RI.skyMins[1][axis] ) RI.skyMins[1][axis] = t;
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if( s > RI.skyMaxs[0][axis] ) RI.skyMaxs[0][axis] = s;
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if( t > RI.skyMaxs[1][axis] ) RI.skyMaxs[1][axis] = t;
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}
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}
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/*
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==============
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ClipSkyPolygon
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==============
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*/
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void ClipSkyPolygon( int nump, vec3_t vecs, int stage )
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{
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const float *norm;
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float *v, d, e;
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qboolean front, back;
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float dists[MAX_CLIP_VERTS + 1];
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int sides[MAX_CLIP_VERTS + 1];
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vec3_t newv[2][MAX_CLIP_VERTS + 1];
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int newc[2];
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int i, j;
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if( nump > MAX_CLIP_VERTS )
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gEngfuncs.Host_Error( "ClipSkyPolygon: MAX_CLIP_VERTS\n" );
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loc1:
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if( stage == 6 )
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{
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// fully clipped, so draw it
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DrawSkyPolygon( nump, vecs );
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return;
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}
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front = back = false;
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norm = skyclip[stage];
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for( i = 0, v = vecs; i < nump; i++, v += 3 )
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{
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d = DotProduct( v, norm );
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if( d > ON_EPSILON )
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{
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front = true;
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sides[i] = SIDE_FRONT;
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}
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else if( d < -ON_EPSILON )
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{
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back = true;
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sides[i] = SIDE_BACK;
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}
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else
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{
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sides[i] = SIDE_ON;
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}
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dists[i] = d;
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}
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if( !front || !back )
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{
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// not clipped
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stage++;
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goto loc1;
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}
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// clip it
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sides[i] = sides[0];
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dists[i] = dists[0];
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VectorCopy( vecs, ( vecs + ( i * 3 )));
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newc[0] = newc[1] = 0;
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for( i = 0, v = vecs; i < nump; i++, v += 3 )
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{
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switch( sides[i] )
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{
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case SIDE_FRONT:
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VectorCopy( v, newv[0][newc[0]] );
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newc[0]++;
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break;
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case SIDE_BACK:
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VectorCopy( v, newv[1][newc[1]] );
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newc[1]++;
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break;
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case SIDE_ON:
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VectorCopy( v, newv[0][newc[0]] );
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newc[0]++;
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VectorCopy( v, newv[1][newc[1]] );
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newc[1]++;
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break;
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}
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if( sides[i] == SIDE_ON || sides[i+1] == SIDE_ON || sides[i+1] == sides[i] )
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continue;
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d = dists[i] / ( dists[i] - dists[i+1] );
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for( j = 0; j < 3; j++ )
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{
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e = v[j] + d * ( v[j+3] - v[j] );
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newv[0][newc[0]][j] = e;
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newv[1][newc[1]][j] = e;
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}
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newc[0]++;
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newc[1]++;
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}
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// continue
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ClipSkyPolygon( newc[0], newv[0][0], stage + 1 );
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ClipSkyPolygon( newc[1], newv[1][0], stage + 1 );
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}
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void MakeSkyVec( float s, float t, int axis )
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{
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int j, k, farclip;
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vec3_t v, b;
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farclip = RI.farClip;
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b[0] = s * (farclip >> 1);
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b[1] = t * (farclip >> 1);
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b[2] = (farclip >> 1);
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for( j = 0; j < 3; j++ )
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{
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k = st_to_vec[axis][j];
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v[j] = (k < 0) ? -b[-k-1] : b[k-1];
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v[j] += RI.cullorigin[j];
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}
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// avoid bilerp seam
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s = (s + 1.0f) * 0.5f;
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t = (t + 1.0f) * 0.5f;
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if( s < 1.0f / 512.0f )
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s = 1.0f / 512.0f;
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else if( s > 511.0f / 512.0f )
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s = 511.0f / 512.0f;
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if( t < 1.0f / 512.0f )
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t = 1.0f / 512.0f;
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else if( t > 511.0f / 512.0f )
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t = 511.0f / 512.0f;
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t = 1.0f - t;
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pglTexCoord2f( s, t );
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pglVertex3fv( v );
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}
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/*
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==============
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R_ClearSkyBox
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==============
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*/
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void R_ClearSkyBox( void )
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{
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int i;
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for( i = 0; i < 6; i++ )
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{
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RI.skyMins[0][i] = RI.skyMins[1][i] = 9999999.0f;
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RI.skyMaxs[0][i] = RI.skyMaxs[1][i] = -9999999.0f;
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}
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}
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/*
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=================
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R_AddSkyBoxSurface
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=================
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*/
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void R_AddSkyBoxSurface( msurface_t *fa )
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{
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vec3_t verts[MAX_CLIP_VERTS];
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glpoly_t *p;
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float *v;
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int i;
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if( ENGINE_GET_PARM( PARM_SKY_SPHERE ) && fa->polys && !tr.fCustomSkybox )
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{
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glpoly_t *p = fa->polys;
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// draw the sky poly
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pglBegin( GL_POLYGON );
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for( i = 0, v = p->verts[0]; i < p->numverts; i++, v += VERTEXSIZE )
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{
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pglTexCoord2f( v[3], v[4] );
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pglVertex3fv( v );
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}
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pglEnd ();
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}
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// calculate vertex values for sky box
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for( p = fa->polys; p; p = p->next )
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{
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for( i = 0; i < p->numverts; i++ )
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VectorSubtract( p->verts[i], RI.cullorigin, verts[i] );
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ClipSkyPolygon( p->numverts, verts[0], 0 );
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}
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}
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/*
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==============
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R_UnloadSkybox
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Unload previous skybox
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==============
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*/
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void R_UnloadSkybox( void )
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{
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int i;
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// release old skybox
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for( i = 0; i < 6; i++ )
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{
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if( !tr.skyboxTextures[i] ) continue;
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GL_FreeTexture( tr.skyboxTextures[i] );
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}
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tr.skyboxbasenum = 5800; // set skybox base (to let some mods load hi-res skyboxes)
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memset( tr.skyboxTextures, 0, sizeof( tr.skyboxTextures ));
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tr.fCustomSkybox = false;
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}
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/*
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==============
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R_DrawSkybox
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==============
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*/
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void R_DrawSkyBox( void )
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{
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int i;
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RI.isSkyVisible = true;
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// don't fogging skybox (this fix old Half-Life bug)
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if( !RI.fogSkybox ) R_AllowFog( false );
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if( RI.fogEnabled )
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pglFogf( GL_FOG_DENSITY, RI.fogDensity * 0.5f );
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pglDisable( GL_BLEND );
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pglDisable( GL_ALPHA_TEST );
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pglTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
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for( i = 0; i < 6; i++ )
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{
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if( RI.skyMins[0][i] >= RI.skyMaxs[0][i] || RI.skyMins[1][i] >= RI.skyMaxs[1][i] )
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continue;
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if( tr.skyboxTextures[r_skyTexOrder[i]] )
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GL_Bind( XASH_TEXTURE0, tr.skyboxTextures[r_skyTexOrder[i]] );
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else GL_Bind( XASH_TEXTURE0, tr.grayTexture ); // stub
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pglBegin( GL_QUADS );
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MakeSkyVec( RI.skyMins[0][i], RI.skyMins[1][i], i );
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MakeSkyVec( RI.skyMins[0][i], RI.skyMaxs[1][i], i );
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MakeSkyVec( RI.skyMaxs[0][i], RI.skyMaxs[1][i], i );
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MakeSkyVec( RI.skyMaxs[0][i], RI.skyMins[1][i], i );
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pglEnd();
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}
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if( !RI.fogSkybox )
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R_AllowFog( true );
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if( RI.fogEnabled )
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pglFogf( GL_FOG_DENSITY, RI.fogDensity );
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R_LoadIdentity();
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}
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/*
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===============
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R_SetupSky
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===============
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*/
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void R_SetupSky( const char *skyboxname )
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{
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char loadname[MAX_STRING];
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char sidenames[6][MAX_STRING];
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int i, len;
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qboolean result;
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if( !COM_CheckString( skyboxname ))
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{
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R_UnloadSkybox();
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return; // clear old skybox
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}
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Q_snprintf( loadname, sizeof( loadname ), "gfx/env/%s", skyboxname );
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COM_StripExtension( loadname );
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// kill the underline suffix to find them manually later
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len = Q_strlen( loadname );
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if( loadname[len - 1] == '_' )
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loadname[len - 1] = '\0';
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result = CheckSkybox( loadname, sidenames );
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// to prevent infinite recursion if default skybox was missed
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if( !result && Q_stricmp( loadname, DEFAULT_SKYBOX_PATH ))
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{
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gEngfuncs.Con_Reportf( S_WARN "missed or incomplete skybox '%s'\n", skyboxname );
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R_SetupSky( "desert" ); // force to default
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return;
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}
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// release old skybox
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R_UnloadSkybox();
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gEngfuncs.Con_DPrintf( "SKY: " );
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for( i = 0; i < 6; i++ )
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{
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tr.skyboxTextures[i] = GL_LoadTexture( sidenames[i], NULL, 0, TF_CLAMP|TF_SKY );
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if( !tr.skyboxTextures[i] )
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break;
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gEngfuncs.Con_DPrintf( "%s%s%s", skyboxname, r_skyBoxSuffix[i], i != 5 ? ", " : ". " );
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}
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if( i == 6 )
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{
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tr.fCustomSkybox = true;
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gEngfuncs.Con_DPrintf( "done\n" );
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return; // loaded
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}
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gEngfuncs.Con_DPrintf( "^2failed\n" );
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R_UnloadSkybox();
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}
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//==============================================================================
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//
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// RENDER CLOUDS
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//
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//==============================================================================
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/*
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==============
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R_CloudVertex
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==============
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*/
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void R_CloudVertex( float s, float t, int axis, vec3_t v )
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{
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int j, k, farclip;
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vec3_t b;
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farclip = RI.farClip;
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b[0] = s * (farclip >> 1);
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b[1] = t * (farclip >> 1);
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b[2] = (farclip >> 1);
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for( j = 0; j < 3; j++ )
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{
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k = st_to_vec[axis][j];
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v[j] = (k < 0) ? -b[-k-1] : b[k-1];
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v[j] += RI.cullorigin[j];
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}
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}
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/*
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=============
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R_CloudTexCoord
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=============
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*/
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void R_CloudTexCoord( vec3_t v, float speed, float *s, float *t )
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{
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float length, speedscale;
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vec3_t dir;
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speedscale = gpGlobals->time * speed;
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speedscale -= (int)speedscale & ~127;
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VectorSubtract( v, RI.vieworg, dir );
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dir[2] *= 3.0f; // flatten the sphere
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length = VectorLength( dir );
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length = 6.0f * 63.0f / length;
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*s = ( speedscale + dir[0] * length ) * (1.0f / 128.0f);
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*t = ( speedscale + dir[1] * length ) * (1.0f / 128.0f);
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}
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/*
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===============
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R_CloudDrawPoly
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===============
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*/
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void R_CloudDrawPoly( glpoly_t *p )
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{
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float s, t;
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float *v;
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int i;
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GL_SetRenderMode( kRenderNormal );
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GL_Bind( XASH_TEXTURE0, tr.solidskyTexture );
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pglBegin( GL_QUADS );
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for( i = 0, v = p->verts[0]; i < 4; i++, v += VERTEXSIZE )
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{
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R_CloudTexCoord( v, 8.0f, &s, &t );
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pglTexCoord2f( s, t );
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pglVertex3fv( v );
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}
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pglEnd();
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GL_SetRenderMode( kRenderTransTexture );
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GL_Bind( XASH_TEXTURE0, tr.alphaskyTexture );
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pglBegin( GL_QUADS );
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for( i = 0, v = p->verts[0]; i < 4; i++, v += VERTEXSIZE )
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{
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R_CloudTexCoord( v, 16.0f, &s, &t );
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pglTexCoord2f( s, t );
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pglVertex3fv( v );
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}
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pglEnd();
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pglDisable( GL_BLEND );
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}
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/*
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==============
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R_CloudRenderSide
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==============
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*/
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void R_CloudRenderSide( int axis )
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{
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vec3_t verts[4];
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float di, qi, dj, qj;
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vec3_t vup, vright;
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vec3_t temp, temp2;
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glpoly_t p[1];
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int i, j;
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R_CloudVertex( -1.0f, -1.0f, axis, verts[0] );
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R_CloudVertex( -1.0f, 1.0f, axis, verts[1] );
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R_CloudVertex( 1.0f, 1.0f, axis, verts[2] );
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R_CloudVertex( 1.0f, -1.0f, axis, verts[3] );
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VectorSubtract( verts[2], verts[3], vup );
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VectorSubtract( verts[2], verts[1], vright );
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p->numverts = 4;
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di = SKYCLOUDS_QUALITY;
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qi = 1.0f / di;
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dj = (axis < 4) ? di * 2 : di; //subdivide vertically more than horizontally on skybox sides
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qj = 1.0f / dj;
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for( i = 0; i < di; i++ )
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{
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for( j = 0; j < dj; j++ )
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{
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if( i * qi < RI.skyMins[0][axis] / 2 + 0.5f - qi
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|| i * qi > RI.skyMaxs[0][axis] / 2 + 0.5f
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|| j * qj < RI.skyMins[1][axis] / 2 + 0.5f - qj
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|| j * qj > RI.skyMaxs[1][axis] / 2 + 0.5f )
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continue;
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VectorScale( vright, qi * i, temp );
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VectorScale( vup, qj * j, temp2 );
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VectorAdd( temp, temp2, temp );
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VectorAdd( verts[0], temp, p->verts[0] );
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VectorScale( vup, qj, temp );
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VectorAdd( p->verts[0], temp, p->verts[1] );
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VectorScale( vright, qi, temp );
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VectorAdd( p->verts[1], temp, p->verts[2] );
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VectorAdd( p->verts[0], temp, p->verts[3] );
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R_CloudDrawPoly( p );
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}
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}
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}
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/*
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==============
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R_DrawClouds
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Quake-style clouds
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==============
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*/
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void R_DrawClouds( void )
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{
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int i;
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RI.isSkyVisible = true;
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if( RI.fogEnabled )
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pglFogf( GL_FOG_DENSITY, RI.fogDensity * 0.25f );
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pglDepthFunc( GL_GEQUAL );
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pglDepthMask( GL_FALSE );
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for( i = 0; i < 6; i++ )
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{
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if( RI.skyMins[0][i] >= RI.skyMaxs[0][i] || RI.skyMins[1][i] >= RI.skyMaxs[1][i] )
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continue;
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R_CloudRenderSide( i );
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}
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pglDepthFunc( GL_LEQUAL );
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pglDepthMask( GL_TRUE );
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if( RI.fogEnabled )
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pglFogf( GL_FOG_DENSITY, RI.fogDensity );
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}
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/*
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=============
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R_InitSkyClouds
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A sky texture is 256*128, with the right side being a masked overlay
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==============
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*/
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void R_InitSkyClouds( mip_t *mt, texture_t *tx, qboolean custom_palette )
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{
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rgbdata_t r_temp, *r_sky;
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uint *trans, *rgba;
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uint transpix;
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int r, g, b;
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int i, j, p;
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char texname[32];
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if( !glw_state.initialized )
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return;
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Q_snprintf( texname, sizeof( texname ), "%s%s.mip", ( mt->offsets[0] > 0 ) ? "#" : "", tx->name );
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if( mt->offsets[0] > 0 )
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{
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int size = (int)sizeof( mip_t ) + ((mt->width * mt->height * 85)>>6);
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if( custom_palette ) size += sizeof( short ) + 768;
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r_sky = gEngfuncs.FS_LoadImage( texname, (byte *)mt, size );
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}
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else
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{
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// okay, loading it from wad
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r_sky = gEngfuncs.FS_LoadImage( texname, NULL, 0 );
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}
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// make sure what sky image is valid
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if( !r_sky || !r_sky->palette || r_sky->type != PF_INDEXED_32 || r_sky->height == 0 )
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{
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gEngfuncs.Con_Reportf( S_ERROR "R_InitSky: unable to load sky texture %s\n", tx->name );
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if( r_sky ) gEngfuncs.FS_FreeImage( r_sky );
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return;
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}
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// make an average value for the back to avoid
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// a fringe on the top level
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trans = Mem_Malloc( r_temppool, r_sky->height * r_sky->height * sizeof( *trans ));
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r = g = b = 0;
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for( i = 0; i < r_sky->width >> 1; i++ )
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{
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for( j = 0; j < r_sky->height; j++ )
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{
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p = r_sky->buffer[i * r_sky->width + j + r_sky->height];
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rgba = (uint *)r_sky->palette + p;
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trans[(i * r_sky->height) + j] = *rgba;
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r += ((byte *)rgba)[0];
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g += ((byte *)rgba)[1];
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b += ((byte *)rgba)[2];
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}
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}
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((byte *)&transpix)[0] = r / ( r_sky->height * r_sky->height );
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((byte *)&transpix)[1] = g / ( r_sky->height * r_sky->height );
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((byte *)&transpix)[2] = b / ( r_sky->height * r_sky->height );
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((byte *)&transpix)[3] = 0;
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// build a temporary image
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r_temp = *r_sky;
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r_temp.width = r_sky->width >> 1;
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r_temp.height = r_sky->height;
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r_temp.type = PF_RGBA_32;
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r_temp.flags = IMAGE_HAS_COLOR;
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r_temp.size = r_temp.width * r_temp.height * 4;
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r_temp.buffer = (byte *)trans;
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r_temp.palette = NULL;
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// load it in
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tr.solidskyTexture = GL_LoadTextureInternal( REF_SOLIDSKY_TEXTURE, &r_temp, TF_NOMIPMAP );
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for( i = 0; i < r_sky->width >> 1; i++ )
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{
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for( j = 0; j < r_sky->height; j++ )
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{
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p = r_sky->buffer[i * r_sky->width + j];
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if( p == 0 )
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{
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trans[(i * r_sky->height) + j] = transpix;
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}
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else
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{
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rgba = (uint *)r_sky->palette + p;
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trans[(i * r_sky->height) + j] = *rgba;
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}
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}
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}
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r_temp.flags = IMAGE_HAS_COLOR|IMAGE_HAS_ALPHA;
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// load it in
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tr.alphaskyTexture = GL_LoadTextureInternal( REF_ALPHASKY_TEXTURE, &r_temp, TF_NOMIPMAP );
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// clean up
|
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gEngfuncs.FS_FreeImage( r_sky );
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Mem_Free( trans );
|
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}
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|
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/*
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=============
|
|
EmitWaterPolys
|
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|
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Does a water warp on the pre-fragmented glpoly_t chain
|
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=============
|
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*/
|
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void EmitWaterPolys( msurface_t *warp, qboolean reverse )
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{
|
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float *v, nv, waveHeight;
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float s, t, os, ot;
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glpoly_t *p;
|
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int i;
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#ifndef XASH_GLES
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const qboolean useQuads = FBitSet( warp->flags, SURF_DRAWTURB_QUADS );
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#else
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const qboolean useQuads = false; // TODO: figure out why
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#endif
|
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if( !warp->polys ) return;
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// set the current waveheight
|
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if( warp->polys->verts[0][2] >= RI.vieworg[2] )
|
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waveHeight = -RI.currententity->curstate.scale;
|
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else waveHeight = RI.currententity->curstate.scale;
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|
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// reset fog color for nonlightmapped water
|
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GL_ResetFogColor();
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if( useQuads )
|
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pglBegin( GL_QUADS );
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for( p = warp->polys; p; p = p->next )
|
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{
|
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if( reverse )
|
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v = p->verts[0] + ( p->numverts - 1 ) * VERTEXSIZE;
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else v = p->verts[0];
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if( !useQuads )
|
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pglBegin( GL_POLYGON );
|
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|
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for( i = 0; i < p->numverts; i++ )
|
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{
|
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if( waveHeight )
|
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{
|
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nv = r_turbsin[(int)(gpGlobals->time * 160.0f + v[1] + v[0]) & 255] + 8.0f;
|
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nv = (r_turbsin[(int)(v[0] * 5.0f + gpGlobals->time * 171.0f - v[1]) & 255] + 8.0f ) * 0.8f + nv;
|
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nv = nv * waveHeight + v[2];
|
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}
|
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else nv = v[2];
|
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|
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os = v[3];
|
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ot = v[4];
|
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|
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s = os + r_turbsin[(int)((ot * 0.125f + gpGlobals->time) * TURBSCALE) & 255];
|
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s *= ( 1.0f / SUBDIVIDE_SIZE );
|
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|
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t = ot + r_turbsin[(int)((os * 0.125f + gpGlobals->time) * TURBSCALE) & 255];
|
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t *= ( 1.0f / SUBDIVIDE_SIZE );
|
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|
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pglTexCoord2f( s, t );
|
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pglVertex3f( v[0], v[1], nv );
|
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|
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if( reverse )
|
|
v -= VERTEXSIZE;
|
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else v += VERTEXSIZE;
|
|
}
|
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|
|
if( !useQuads )
|
|
pglEnd();
|
|
}
|
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|
|
if( useQuads )
|
|
pglEnd();
|
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|
|
GL_SetupFogColorForSurfaces();
|
|
}
|