mirror of
https://github.com/UberGames/lilium-voyager.git
synced 2024-12-12 21:22:14 +00:00
2dcc5719e3
Explicitly set cull type for skybox to front, instead of using whatever cull type the previous shader used (which could result in the skybox not being visible due to only drawing back faces). The sky cloud stages set the cull type so they are not affected by previous cull type.
795 lines
18 KiB
C
795 lines
18 KiB
C
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, 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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You should have received a copy of the GNU General Public License
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along with Quake III Arena source code; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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// tr_sky.c
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#include "tr_local.h"
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#define SKY_SUBDIVISIONS 8
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#define HALF_SKY_SUBDIVISIONS (SKY_SUBDIVISIONS/2)
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static float s_cloudTexCoords[6][SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1][2];
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static float s_cloudTexP[6][SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1];
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/*
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===================================================================================
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POLYGON TO BOX SIDE PROJECTION
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===================================================================================
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*/
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static vec3_t sky_clip[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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static float sky_mins[2][6], sky_maxs[2][6];
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static float sky_min, sky_max;
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/*
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================
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AddSkyPolygon
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================
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*/
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static void AddSkyPolygon (int nump, vec3_t vecs)
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{
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int i,j;
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vec3_t v, av;
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float s, t, dv;
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int axis;
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float *vp;
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// s = [0]/[2], t = [1]/[2]
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static 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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// {-1,2,3},
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// {1,2,-3}
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};
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// decide which face it maps to
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VectorCopy (vec3_origin, v);
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for (i=0, vp=vecs ; i<nump ; i++, vp+=3)
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{
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VectorAdd (vp, v, v);
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}
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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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{
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if (v[0] < 0)
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axis = 1;
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else
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axis = 0;
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}
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else if (av[1] > av[2] && av[1] > av[0])
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{
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if (v[1] < 0)
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axis = 3;
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else
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axis = 2;
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}
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else
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{
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if (v[2] < 0)
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axis = 5;
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else
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axis = 4;
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}
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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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if (j > 0)
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dv = vecs[j - 1];
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else
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dv = -vecs[-j - 1];
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if (dv < 0.001)
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continue; // don't divide by zero
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j = vec_to_st[axis][0];
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if (j < 0)
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s = -vecs[-j -1] / dv;
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else
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s = vecs[j-1] / dv;
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j = vec_to_st[axis][1];
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if (j < 0)
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t = -vecs[-j -1] / dv;
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else
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t = vecs[j-1] / dv;
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if (s < sky_mins[0][axis])
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sky_mins[0][axis] = s;
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if (t < sky_mins[1][axis])
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sky_mins[1][axis] = t;
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if (s > sky_maxs[0][axis])
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sky_maxs[0][axis] = s;
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if (t > sky_maxs[1][axis])
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sky_maxs[1][axis] = t;
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}
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}
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#define ON_EPSILON 0.1f // point on plane side epsilon
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#define MAX_CLIP_VERTS 64
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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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static void ClipSkyPolygon (int nump, vec3_t vecs, int stage)
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{
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float *norm;
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float *v;
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qboolean front, back;
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float d, e;
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float dists[MAX_CLIP_VERTS];
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int sides[MAX_CLIP_VERTS];
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vec3_t newv[2][MAX_CLIP_VERTS];
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int newc[2];
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int i, j;
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if (nump > MAX_CLIP_VERTS-2)
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ri.Error (ERR_DROP, "ClipSkyPolygon: MAX_CLIP_VERTS");
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if (stage == 6)
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{ // fully clipped, so draw it
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AddSkyPolygon (nump, vecs);
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return;
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}
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front = back = qfalse;
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norm = sky_clip[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 = qtrue;
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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 = qtrue;
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sides[i] = SIDE_BACK;
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}
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else
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sides[i] = SIDE_ON;
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dists[i] = d;
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}
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if (!front || !back)
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{ // not clipped
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ClipSkyPolygon (nump, vecs, stage+1);
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return;
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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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/*
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==============
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ClearSkyBox
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==============
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*/
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static void ClearSkyBox (void) {
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int i;
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for (i=0 ; i<6 ; i++) {
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sky_mins[0][i] = sky_mins[1][i] = 9999;
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sky_maxs[0][i] = sky_maxs[1][i] = -9999;
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}
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}
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/*
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================
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RB_ClipSkyPolygons
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================
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*/
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void RB_ClipSkyPolygons( shaderCommands_t *input )
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{
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vec3_t p[5]; // need one extra point for clipping
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int i, j;
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ClearSkyBox();
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for ( i = 0; i < input->numIndexes; i += 3 )
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{
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for (j = 0 ; j < 3 ; j++)
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{
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VectorSubtract( input->xyz[input->indexes[i+j]],
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backEnd.viewParms.or.origin,
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p[j] );
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}
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ClipSkyPolygon( 3, p[0], 0 );
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}
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}
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/*
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===================================================================================
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CLOUD VERTEX GENERATION
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===================================================================================
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*/
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/*
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** MakeSkyVec
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**
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** Parms: s, t range from -1 to 1
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*/
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static void MakeSkyVec( float s, float t, int axis, float outSt[2], vec3_t outXYZ )
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{
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// 1 = s, 2 = t, 3 = 2048
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static 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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vec3_t b;
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int j, k;
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float boxSize;
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boxSize = backEnd.viewParms.zFar / 1.75; // div sqrt(3)
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b[0] = s*boxSize;
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b[1] = t*boxSize;
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b[2] = boxSize;
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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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if (k < 0)
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{
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outXYZ[j] = -b[-k - 1];
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}
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else
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{
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outXYZ[j] = b[k - 1];
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}
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}
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// avoid bilerp seam
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s = (s+1)*0.5;
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t = (t+1)*0.5;
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if (s < sky_min)
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{
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s = sky_min;
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}
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else if (s > sky_max)
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{
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s = sky_max;
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}
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if (t < sky_min)
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{
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t = sky_min;
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}
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else if (t > sky_max)
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{
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t = sky_max;
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}
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t = 1.0 - t;
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if ( outSt )
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{
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outSt[0] = s;
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outSt[1] = t;
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}
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}
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static int sky_texorder[6] = {0,2,1,3,4,5};
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static vec3_t s_skyPoints[SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1];
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static float s_skyTexCoords[SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1][2];
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static void DrawSkySide( struct image_s *image, const int mins[2], const int maxs[2] )
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{
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int s, t;
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GL_Bind( image );
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for ( t = mins[1]+HALF_SKY_SUBDIVISIONS; t < maxs[1]+HALF_SKY_SUBDIVISIONS; t++ )
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{
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qglBegin( GL_TRIANGLE_STRIP );
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for ( s = mins[0]+HALF_SKY_SUBDIVISIONS; s <= maxs[0]+HALF_SKY_SUBDIVISIONS; s++ )
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{
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qglTexCoord2fv( s_skyTexCoords[t][s] );
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qglVertex3fv( s_skyPoints[t][s] );
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qglTexCoord2fv( s_skyTexCoords[t+1][s] );
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qglVertex3fv( s_skyPoints[t+1][s] );
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}
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qglEnd();
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}
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}
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static void DrawSkyBox( shader_t *shader )
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{
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int i;
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sky_min = 0;
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sky_max = 1;
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Com_Memset( s_skyTexCoords, 0, sizeof( s_skyTexCoords ) );
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for (i=0 ; i<6 ; i++)
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{
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int sky_mins_subd[2], sky_maxs_subd[2];
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int s, t;
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sky_mins[0][i] = floor( sky_mins[0][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
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sky_mins[1][i] = floor( sky_mins[1][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
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sky_maxs[0][i] = ceil( sky_maxs[0][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
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sky_maxs[1][i] = ceil( sky_maxs[1][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
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if ( ( sky_mins[0][i] >= sky_maxs[0][i] ) ||
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( sky_mins[1][i] >= sky_maxs[1][i] ) )
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{
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continue;
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}
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sky_mins_subd[0] = sky_mins[0][i] * HALF_SKY_SUBDIVISIONS;
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sky_mins_subd[1] = sky_mins[1][i] * HALF_SKY_SUBDIVISIONS;
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sky_maxs_subd[0] = sky_maxs[0][i] * HALF_SKY_SUBDIVISIONS;
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sky_maxs_subd[1] = sky_maxs[1][i] * HALF_SKY_SUBDIVISIONS;
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if ( sky_mins_subd[0] < -HALF_SKY_SUBDIVISIONS )
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sky_mins_subd[0] = -HALF_SKY_SUBDIVISIONS;
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else if ( sky_mins_subd[0] > HALF_SKY_SUBDIVISIONS )
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sky_mins_subd[0] = HALF_SKY_SUBDIVISIONS;
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if ( sky_mins_subd[1] < -HALF_SKY_SUBDIVISIONS )
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sky_mins_subd[1] = -HALF_SKY_SUBDIVISIONS;
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else if ( sky_mins_subd[1] > HALF_SKY_SUBDIVISIONS )
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sky_mins_subd[1] = HALF_SKY_SUBDIVISIONS;
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if ( sky_maxs_subd[0] < -HALF_SKY_SUBDIVISIONS )
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sky_maxs_subd[0] = -HALF_SKY_SUBDIVISIONS;
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else if ( sky_maxs_subd[0] > HALF_SKY_SUBDIVISIONS )
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sky_maxs_subd[0] = HALF_SKY_SUBDIVISIONS;
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if ( sky_maxs_subd[1] < -HALF_SKY_SUBDIVISIONS )
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sky_maxs_subd[1] = -HALF_SKY_SUBDIVISIONS;
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else if ( sky_maxs_subd[1] > HALF_SKY_SUBDIVISIONS )
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sky_maxs_subd[1] = HALF_SKY_SUBDIVISIONS;
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//
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// iterate through the subdivisions
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//
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for ( t = sky_mins_subd[1]+HALF_SKY_SUBDIVISIONS; t <= sky_maxs_subd[1]+HALF_SKY_SUBDIVISIONS; t++ )
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{
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for ( s = sky_mins_subd[0]+HALF_SKY_SUBDIVISIONS; s <= sky_maxs_subd[0]+HALF_SKY_SUBDIVISIONS; s++ )
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{
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MakeSkyVec( ( s - HALF_SKY_SUBDIVISIONS ) / ( float ) HALF_SKY_SUBDIVISIONS,
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( t - HALF_SKY_SUBDIVISIONS ) / ( float ) HALF_SKY_SUBDIVISIONS,
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i,
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s_skyTexCoords[t][s],
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s_skyPoints[t][s] );
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}
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}
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DrawSkySide( shader->sky.outerbox[sky_texorder[i]],
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sky_mins_subd,
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sky_maxs_subd );
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}
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}
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static void FillCloudySkySide( const int mins[2], const int maxs[2], qboolean addIndexes )
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{
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int s, t;
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int vertexStart = tess.numVertexes;
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int tHeight, sWidth;
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tHeight = maxs[1] - mins[1] + 1;
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sWidth = maxs[0] - mins[0] + 1;
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for ( t = mins[1]+HALF_SKY_SUBDIVISIONS; t <= maxs[1]+HALF_SKY_SUBDIVISIONS; t++ )
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{
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for ( s = mins[0]+HALF_SKY_SUBDIVISIONS; s <= maxs[0]+HALF_SKY_SUBDIVISIONS; s++ )
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{
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VectorAdd( s_skyPoints[t][s], backEnd.viewParms.or.origin, tess.xyz[tess.numVertexes] );
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tess.texCoords[tess.numVertexes][0][0] = s_skyTexCoords[t][s][0];
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tess.texCoords[tess.numVertexes][0][1] = s_skyTexCoords[t][s][1];
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tess.numVertexes++;
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if ( tess.numVertexes >= SHADER_MAX_VERTEXES )
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{
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ri.Error( ERR_DROP, "SHADER_MAX_VERTEXES hit in FillCloudySkySide()" );
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}
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}
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}
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// only add indexes for one pass, otherwise it would draw multiple times for each pass
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if ( addIndexes ) {
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for ( t = 0; t < tHeight-1; t++ )
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{
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for ( s = 0; s < sWidth-1; s++ )
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{
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tess.indexes[tess.numIndexes] = vertexStart + s + t * ( sWidth );
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tess.numIndexes++;
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tess.indexes[tess.numIndexes] = vertexStart + s + ( t + 1 ) * ( sWidth );
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tess.numIndexes++;
|
|
tess.indexes[tess.numIndexes] = vertexStart + s + 1 + t * ( sWidth );
|
|
tess.numIndexes++;
|
|
|
|
tess.indexes[tess.numIndexes] = vertexStart + s + ( t + 1 ) * ( sWidth );
|
|
tess.numIndexes++;
|
|
tess.indexes[tess.numIndexes] = vertexStart + s + 1 + ( t + 1 ) * ( sWidth );
|
|
tess.numIndexes++;
|
|
tess.indexes[tess.numIndexes] = vertexStart + s + 1 + t * ( sWidth );
|
|
tess.numIndexes++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void FillCloudBox( const shader_t *shader, int stage )
|
|
{
|
|
int i;
|
|
|
|
for ( i =0; i < 6; i++ )
|
|
{
|
|
int sky_mins_subd[2], sky_maxs_subd[2];
|
|
int s, t;
|
|
float MIN_T;
|
|
|
|
if ( 1 ) // FIXME? shader->sky.fullClouds )
|
|
{
|
|
MIN_T = -HALF_SKY_SUBDIVISIONS;
|
|
|
|
// still don't want to draw the bottom, even if fullClouds
|
|
if ( i == 5 )
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
switch( i )
|
|
{
|
|
case 0:
|
|
case 1:
|
|
case 2:
|
|
case 3:
|
|
MIN_T = -1;
|
|
break;
|
|
case 5:
|
|
// don't draw clouds beneath you
|
|
continue;
|
|
case 4: // top
|
|
default:
|
|
MIN_T = -HALF_SKY_SUBDIVISIONS;
|
|
break;
|
|
}
|
|
}
|
|
|
|
sky_mins[0][i] = floor( sky_mins[0][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
|
|
sky_mins[1][i] = floor( sky_mins[1][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
|
|
sky_maxs[0][i] = ceil( sky_maxs[0][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
|
|
sky_maxs[1][i] = ceil( sky_maxs[1][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
|
|
|
|
if ( ( sky_mins[0][i] >= sky_maxs[0][i] ) ||
|
|
( sky_mins[1][i] >= sky_maxs[1][i] ) )
|
|
{
|
|
continue;
|
|
}
|
|
|
|
sky_mins_subd[0] = ri.ftol(sky_mins[0][i] * HALF_SKY_SUBDIVISIONS);
|
|
sky_mins_subd[1] = ri.ftol(sky_mins[1][i] * HALF_SKY_SUBDIVISIONS);
|
|
sky_maxs_subd[0] = ri.ftol(sky_maxs[0][i] * HALF_SKY_SUBDIVISIONS);
|
|
sky_maxs_subd[1] = ri.ftol(sky_maxs[1][i] * HALF_SKY_SUBDIVISIONS);
|
|
|
|
if ( sky_mins_subd[0] < -HALF_SKY_SUBDIVISIONS )
|
|
sky_mins_subd[0] = -HALF_SKY_SUBDIVISIONS;
|
|
else if ( sky_mins_subd[0] > HALF_SKY_SUBDIVISIONS )
|
|
sky_mins_subd[0] = HALF_SKY_SUBDIVISIONS;
|
|
if ( sky_mins_subd[1] < MIN_T )
|
|
sky_mins_subd[1] = MIN_T;
|
|
else if ( sky_mins_subd[1] > HALF_SKY_SUBDIVISIONS )
|
|
sky_mins_subd[1] = HALF_SKY_SUBDIVISIONS;
|
|
|
|
if ( sky_maxs_subd[0] < -HALF_SKY_SUBDIVISIONS )
|
|
sky_maxs_subd[0] = -HALF_SKY_SUBDIVISIONS;
|
|
else if ( sky_maxs_subd[0] > HALF_SKY_SUBDIVISIONS )
|
|
sky_maxs_subd[0] = HALF_SKY_SUBDIVISIONS;
|
|
if ( sky_maxs_subd[1] < MIN_T )
|
|
sky_maxs_subd[1] = MIN_T;
|
|
else if ( sky_maxs_subd[1] > HALF_SKY_SUBDIVISIONS )
|
|
sky_maxs_subd[1] = HALF_SKY_SUBDIVISIONS;
|
|
|
|
//
|
|
// iterate through the subdivisions
|
|
//
|
|
for ( t = sky_mins_subd[1]+HALF_SKY_SUBDIVISIONS; t <= sky_maxs_subd[1]+HALF_SKY_SUBDIVISIONS; t++ )
|
|
{
|
|
for ( s = sky_mins_subd[0]+HALF_SKY_SUBDIVISIONS; s <= sky_maxs_subd[0]+HALF_SKY_SUBDIVISIONS; s++ )
|
|
{
|
|
MakeSkyVec( ( s - HALF_SKY_SUBDIVISIONS ) / ( float ) HALF_SKY_SUBDIVISIONS,
|
|
( t - HALF_SKY_SUBDIVISIONS ) / ( float ) HALF_SKY_SUBDIVISIONS,
|
|
i,
|
|
NULL,
|
|
s_skyPoints[t][s] );
|
|
|
|
s_skyTexCoords[t][s][0] = s_cloudTexCoords[i][t][s][0];
|
|
s_skyTexCoords[t][s][1] = s_cloudTexCoords[i][t][s][1];
|
|
}
|
|
}
|
|
|
|
// only add indexes for first stage
|
|
FillCloudySkySide( sky_mins_subd, sky_maxs_subd, ( stage == 0 ) );
|
|
}
|
|
}
|
|
|
|
/*
|
|
** R_BuildCloudData
|
|
*/
|
|
void R_BuildCloudData( shaderCommands_t *input )
|
|
{
|
|
int i;
|
|
shader_t *shader;
|
|
|
|
shader = input->shader;
|
|
|
|
assert( shader->isSky );
|
|
|
|
sky_min = 1.0 / 256.0f; // FIXME: not correct?
|
|
sky_max = 255.0 / 256.0f;
|
|
|
|
// set up for drawing
|
|
tess.numIndexes = 0;
|
|
tess.numVertexes = 0;
|
|
|
|
if ( shader->sky.cloudHeight )
|
|
{
|
|
for ( i = 0; i < MAX_SHADER_STAGES; i++ )
|
|
{
|
|
if ( !tess.xstages[i] ) {
|
|
break;
|
|
}
|
|
FillCloudBox( shader, i );
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
** R_InitSkyTexCoords
|
|
** Called when a sky shader is parsed
|
|
*/
|
|
#define SQR( a ) ((a)*(a))
|
|
void R_InitSkyTexCoords( float heightCloud )
|
|
{
|
|
int i, s, t;
|
|
float radiusWorld = 4096;
|
|
float p;
|
|
float sRad, tRad;
|
|
vec3_t skyVec;
|
|
vec3_t v;
|
|
|
|
// init zfar so MakeSkyVec works even though
|
|
// a world hasn't been bounded
|
|
backEnd.viewParms.zFar = 1024;
|
|
|
|
for ( i = 0; i < 6; i++ )
|
|
{
|
|
for ( t = 0; t <= SKY_SUBDIVISIONS; t++ )
|
|
{
|
|
for ( s = 0; s <= SKY_SUBDIVISIONS; s++ )
|
|
{
|
|
// compute vector from view origin to sky side integral point
|
|
MakeSkyVec( ( s - HALF_SKY_SUBDIVISIONS ) / ( float ) HALF_SKY_SUBDIVISIONS,
|
|
( t - HALF_SKY_SUBDIVISIONS ) / ( float ) HALF_SKY_SUBDIVISIONS,
|
|
i,
|
|
NULL,
|
|
skyVec );
|
|
|
|
// compute parametric value 'p' that intersects with cloud layer
|
|
p = ( 1.0f / ( 2 * DotProduct( skyVec, skyVec ) ) ) *
|
|
( -2 * skyVec[2] * radiusWorld +
|
|
2 * sqrt( SQR( skyVec[2] ) * SQR( radiusWorld ) +
|
|
2 * SQR( skyVec[0] ) * radiusWorld * heightCloud +
|
|
SQR( skyVec[0] ) * SQR( heightCloud ) +
|
|
2 * SQR( skyVec[1] ) * radiusWorld * heightCloud +
|
|
SQR( skyVec[1] ) * SQR( heightCloud ) +
|
|
2 * SQR( skyVec[2] ) * radiusWorld * heightCloud +
|
|
SQR( skyVec[2] ) * SQR( heightCloud ) ) );
|
|
|
|
s_cloudTexP[i][t][s] = p;
|
|
|
|
// compute intersection point based on p
|
|
VectorScale( skyVec, p, v );
|
|
v[2] += radiusWorld;
|
|
|
|
// compute vector from world origin to intersection point 'v'
|
|
VectorNormalize( v );
|
|
|
|
sRad = Q_acos( v[0] );
|
|
tRad = Q_acos( v[1] );
|
|
|
|
s_cloudTexCoords[i][t][s][0] = sRad;
|
|
s_cloudTexCoords[i][t][s][1] = tRad;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//======================================================================================
|
|
|
|
/*
|
|
** RB_DrawSun
|
|
*/
|
|
void RB_DrawSun( float scale, shader_t *shader ) {
|
|
float size;
|
|
float dist;
|
|
vec3_t origin, vec1, vec2;
|
|
byte sunColor[4] = { 255, 255, 255, 255 };
|
|
|
|
if ( !backEnd.skyRenderedThisView ) {
|
|
return;
|
|
}
|
|
|
|
qglLoadMatrixf( backEnd.viewParms.world.modelMatrix );
|
|
qglTranslatef (backEnd.viewParms.or.origin[0], backEnd.viewParms.or.origin[1], backEnd.viewParms.or.origin[2]);
|
|
|
|
dist = backEnd.viewParms.zFar / 1.75; // div sqrt(3)
|
|
size = dist * scale;
|
|
|
|
VectorScale( tr.sunDirection, dist, origin );
|
|
PerpendicularVector( vec1, tr.sunDirection );
|
|
CrossProduct( tr.sunDirection, vec1, vec2 );
|
|
|
|
VectorScale( vec1, size, vec1 );
|
|
VectorScale( vec2, size, vec2 );
|
|
|
|
// farthest depth range
|
|
qglDepthRange( 1.0, 1.0 );
|
|
|
|
RB_BeginSurface( shader, 0 );
|
|
|
|
RB_AddQuadStamp(origin, vec1, vec2, sunColor);
|
|
|
|
RB_EndSurface();
|
|
|
|
// back to normal depth range
|
|
qglDepthRange( 0.0, 1.0 );
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
================
|
|
RB_StageIteratorSky
|
|
|
|
All of the visible sky triangles are in tess
|
|
|
|
Other things could be stuck in here, like birds in the sky, etc
|
|
================
|
|
*/
|
|
void RB_StageIteratorSky( void ) {
|
|
if ( r_fastsky->integer ) {
|
|
return;
|
|
}
|
|
|
|
// go through all the polygons and project them onto
|
|
// the sky box to see which blocks on each side need
|
|
// to be drawn
|
|
RB_ClipSkyPolygons( &tess );
|
|
|
|
// r_showsky will let all the sky blocks be drawn in
|
|
// front of everything to allow developers to see how
|
|
// much sky is getting sucked in
|
|
if ( r_showsky->integer ) {
|
|
qglDepthRange( 0.0, 0.0 );
|
|
} else {
|
|
qglDepthRange( 1.0, 1.0 );
|
|
}
|
|
|
|
// draw the outer skybox
|
|
if ( tess.shader->sky.outerbox[0] && tess.shader->sky.outerbox[0] != tr.defaultImage ) {
|
|
qglColor3f( tr.identityLight, tr.identityLight, tr.identityLight );
|
|
|
|
qglPushMatrix ();
|
|
GL_State( 0 );
|
|
GL_Cull( CT_FRONT_SIDED );
|
|
qglTranslatef (backEnd.viewParms.or.origin[0], backEnd.viewParms.or.origin[1], backEnd.viewParms.or.origin[2]);
|
|
|
|
DrawSkyBox( tess.shader );
|
|
|
|
qglPopMatrix();
|
|
}
|
|
|
|
// generate the vertexes for all the clouds, which will be drawn
|
|
// by the generic shader routine
|
|
R_BuildCloudData( &tess );
|
|
|
|
RB_StageIteratorGeneric();
|
|
|
|
// draw the inner skybox
|
|
|
|
|
|
// back to normal depth range
|
|
qglDepthRange( 0.0, 1.0 );
|
|
|
|
// note that sky was drawn so we will draw a sun later
|
|
backEnd.skyRenderedThisView = qtrue;
|
|
}
|
|
|