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st/code/renderer/tr_sky.c
archive 1c7954095a as released 2008-04-04
2008-04-04 00:00:00 +00:00

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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
Copyright (C) 2007 HermitWorks Entertainment Corporation
This file is part of the Space Trader source code.
The Space Trader source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
The Space Trader source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the Space Trader source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
#include "tr_local.h"
#include "tr_stars.h"
#define SKY_SUBDIVISIONS 8
#define HALF_SKY_SUBDIVISIONS (SKY_SUBDIVISIONS/2)
static float s_cloudTexCoords[6][SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1][2];
static float s_cloudTexP[6][SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1];
/*
===================================================================================
POLYGON TO BOX SIDE PROJECTION
===================================================================================
*/
static vec3_t sky_clip[6] =
{
{ 1, 1, 0 },
{ 1, -1, 0 },
{ 0, -1, 1 },
{ 0, 1, 1 },
{ 1, 0, 1 },
{ -1, 0, 1 }
};
static float sky_mins[2][6], sky_maxs[2][6];
static float sky_min, sky_max;
/*
================
AddSkyPolygon
================
*/
static void AddSkyPolygon (int nump, vec3_t vecs)
{
int i,j;
vec3_t v, av;
float s, t, dv;
int axis;
float *vp;
// s = [0]/[2], t = [1]/[2]
static int vec_to_st[6][3] =
{
{-2,3,1},
{2,3,-1},
{1,3,2},
{-1,3,-2},
{-2,-1,3},
{-2,1,-3}
// {-1,2,3},
// {1,2,-3}
};
// decide which face it maps to
VectorCopy (vec3_origin, v);
for (i=0, vp=vecs ; i<nump ; i++, vp+=3)
{
VectorAdd (vp, v, v);
}
av[0] = fabs(v[0]);
av[1] = fabs(v[1]);
av[2] = fabs(v[2]);
if (av[0] > av[1] && av[0] > av[2])
{
if (v[0] < 0)
axis = 1;
else
axis = 0;
}
else if (av[1] > av[2] && av[1] > av[0])
{
if (v[1] < 0)
axis = 3;
else
axis = 2;
}
else
{
if (v[2] < 0)
axis = 5;
else
axis = 4;
}
// project new texture coords
for (i=0 ; i<nump ; i++, vecs+=3)
{
j = vec_to_st[axis][2];
if (j > 0)
dv = vecs[j - 1];
else
dv = -vecs[-j - 1];
if (dv < 0.001)
continue; // don't divide by zero
j = vec_to_st[axis][0];
if (j < 0)
s = -vecs[-j -1] / dv;
else
s = vecs[j-1] / dv;
j = vec_to_st[axis][1];
if (j < 0)
t = -vecs[-j -1] / dv;
else
t = vecs[j-1] / dv;
if (s < sky_mins[0][axis])
sky_mins[0][axis] = s;
if (t < sky_mins[1][axis])
sky_mins[1][axis] = t;
if (s > sky_maxs[0][axis])
sky_maxs[0][axis] = s;
if (t > sky_maxs[1][axis])
sky_maxs[1][axis] = t;
}
}
#define ON_EPSILON 0.1f // point on plane side epsilon
#define MAX_CLIP_VERTS 64
/*
================
ClipSkyPolygon
================
*/
static void ClipSkyPolygon (int nump, vec3_t vecs, int stage)
{
float *norm;
float *v;
qboolean front, back;
float d, e;
float dists[MAX_CLIP_VERTS];
int sides[MAX_CLIP_VERTS];
vec3_t newv[2][MAX_CLIP_VERTS];
int newc[2];
int i, j;
if (nump > MAX_CLIP_VERTS-2)
ri.Error (ERR_DROP, "ClipSkyPolygon: MAX_CLIP_VERTS");
if (stage == 6)
{ // fully clipped, so draw it
AddSkyPolygon (nump, vecs);
return;
}
front = back = qfalse;
norm = sky_clip[stage];
for (i=0, v = vecs ; i<nump ; i++, v+=3)
{
d = DotProduct (v, norm);
if (d > ON_EPSILON)
{
front = qtrue;
sides[i] = SIDE_FRONT;
}
else if (d < -ON_EPSILON)
{
back = qtrue;
sides[i] = SIDE_BACK;
}
else
sides[i] = SIDE_ON;
dists[i] = d;
}
if (!front || !back)
{ // not clipped
ClipSkyPolygon (nump, vecs, stage+1);
return;
}
// clip it
sides[i] = sides[0];
dists[i] = dists[0];
VectorCopy (vecs, (vecs+(i*3)) );
newc[0] = newc[1] = 0;
for (i=0, v = vecs ; i<nump ; i++, v+=3)
{
switch (sides[i])
{
case SIDE_FRONT:
VectorCopy (v, newv[0][newc[0]]);
newc[0]++;
break;
case SIDE_BACK:
VectorCopy (v, newv[1][newc[1]]);
newc[1]++;
break;
case SIDE_ON:
VectorCopy (v, newv[0][newc[0]]);
newc[0]++;
VectorCopy (v, newv[1][newc[1]]);
newc[1]++;
break;
}
if (sides[i] == SIDE_ON || sides[i+1] == SIDE_ON || sides[i+1] == sides[i])
continue;
d = dists[i] / (dists[i] - dists[i+1]);
for (j=0 ; j<3 ; j++)
{
e = v[j] + d*(v[j+3] - v[j]);
newv[0][newc[0]][j] = e;
newv[1][newc[1]][j] = e;
}
newc[0]++;
newc[1]++;
}
// continue
ClipSkyPolygon (newc[0], newv[0][0], stage+1);
ClipSkyPolygon (newc[1], newv[1][0], stage+1);
}
/*
==============
ClearSkyBox
==============
*/
static void ClearSkyBox (void) {
int i;
for (i=0 ; i<6 ; i++) {
sky_mins[0][i] = sky_mins[1][i] = 9999;
sky_maxs[0][i] = sky_maxs[1][i] = -9999;
}
}
/*
================
RB_ClipSkyPolygons
================
*/
void RB_ClipSkyPolygons( shaderCommands_t *input )
{
vec3_t p[5]; // need one extra point for clipping
int i, j;
ClearSkyBox();
for ( i = 0; i < input->numIndexes; i += 3 )
{
for (j = 0 ; j < 3 ; j++)
{
VectorSubtract( input->xyz[input->indexes[i+j]],
backEnd.viewParms.or.origin,
p[j] );
}
ClipSkyPolygon( 3, p[0], 0 );
}
}
/*
===================================================================================
CLOUD VERTEX GENERATION
===================================================================================
*/
/*
** MakeSkyVec
**
** Parms: s, t range from -1 to 1
*/
static void MakeSkyVec( float s, float t, int axis, float outSt[2], vec3_t outXYZ )
{
// 1 = s, 2 = t, 3 = 2048
static int st_to_vec[6][3] =
{
{3,-1,2},
{-3,1,2},
{1,3,2},
{-1,-3,2},
{-2,-1,3}, // 0 degrees yaw, look straight up
{2,-1,-3} // look straight down
};
vec3_t b;
int j, k;
float boxSize;
boxSize = backEnd.viewParms.zFar / 1.75; // div sqrt(3)
b[0] = s*boxSize;
b[1] = t*boxSize;
b[2] = boxSize;
for (j=0 ; j<3 ; j++)
{
k = st_to_vec[axis][j];
if (k < 0)
{
outXYZ[j] = -b[-k - 1];
}
else
{
outXYZ[j] = b[k - 1];
}
}
// avoid bilerp seam
s = (s+1)*0.5;
t = (t+1)*0.5;
if (s < sky_min)
{
s = sky_min;
}
else if (s > sky_max)
{
s = sky_max;
}
if (t < sky_min)
{
t = sky_min;
}
else if (t > sky_max)
{
t = sky_max;
}
t = 1.0 - t;
if ( outSt )
{
outSt[0] = s;
outSt[1] = t;
}
}
static int sky_texorder[6] = {0,2,1,3,4,5};
static vec3_t s_skyPoints[SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1];
static float s_skyTexCoords[SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1][2];
static stateGroup_t DrawSkySide( struct image_t *image, const int mins[2], const int maxs[2], stateGroup_t prevSg )
{
stateGroup_t sg;
int s, t;
sg = R_StateBeginGroup();
R_StateSetTexture( image, GL_TEXTURE0_ARB );
R_StateRestorePriorGroupStates( prevSg );
prevSg = sg;
for ( t = mins[1]+HALF_SKY_SUBDIVISIONS; t < maxs[1]+HALF_SKY_SUBDIVISIONS; t++ )
{
glBegin( GL_TRIANGLE_STRIP );
for ( s = mins[0]+HALF_SKY_SUBDIVISIONS; s <= maxs[0]+HALF_SKY_SUBDIVISIONS; s++ )
{
glTexCoord2fv( s_skyTexCoords[t][s] );
glVertex3fv( s_skyPoints[t][s] );
glTexCoord2fv( s_skyTexCoords[t+1][s] );
glVertex3fv( s_skyPoints[t+1][s] );
}
glEnd();
}
return prevSg;
}
static void DrawSkyBox( shader_t *shader, stateGroup_t sg )
{
int i;
sky_min = 0;
sky_max = 1;
Com_Memset( s_skyTexCoords, 0, sizeof( s_skyTexCoords ) );
for (i=0 ; i<6 ; i++)
{
int sky_mins_subd[2], sky_maxs_subd[2];
int s, t;
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] = sky_mins[0][i] * HALF_SKY_SUBDIVISIONS;
sky_mins_subd[1] = sky_mins[1][i] * HALF_SKY_SUBDIVISIONS;
sky_maxs_subd[0] = sky_maxs[0][i] * HALF_SKY_SUBDIVISIONS;
sky_maxs_subd[1] = 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] < -HALF_SKY_SUBDIVISIONS )
sky_mins_subd[1] = -HALF_SKY_SUBDIVISIONS;
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] < -HALF_SKY_SUBDIVISIONS )
sky_maxs_subd[1] = -HALF_SKY_SUBDIVISIONS;
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,
s_skyTexCoords[t][s],
s_skyPoints[t][s] );
}
}
sg = DrawSkySide( shader->sky.outerbox[sky_texorder[i]], sky_mins_subd, sky_maxs_subd, sg );
}
}
static void FillCloudySkySide( const int mins[2], const int maxs[2], qboolean addIndexes )
{
int s, t;
int vertexStart = tess.numVertexes;
int tHeight, sWidth;
tHeight = maxs[1] - mins[1] + 1;
sWidth = maxs[0] - mins[0] + 1;
for ( t = mins[1]+HALF_SKY_SUBDIVISIONS; t <= maxs[1]+HALF_SKY_SUBDIVISIONS; t++ )
{
for ( s = mins[0]+HALF_SKY_SUBDIVISIONS; s <= maxs[0]+HALF_SKY_SUBDIVISIONS; s++ )
{
VectorAdd( s_skyPoints[t][s], backEnd.viewParms.or.origin, tess.xyz[tess.numVertexes] );
tess.texCoords[tess.numVertexes][0][0] = s_skyTexCoords[t][s][0];
tess.texCoords[tess.numVertexes][0][1] = s_skyTexCoords[t][s][1];
tess.numVertexes++;
if ( tess.numVertexes >= SHADER_MAX_VERTEXES )
{
ri.Error( ERR_DROP, "SHADER_MAX_VERTEXES hit in FillCloudySkySide()\n" );
}
}
}
// only add indexes for one pass, otherwise it would draw multiple times for each pass
if ( addIndexes ) {
for ( t = 0; t < tHeight-1; t++ )
{
for ( s = 0; s < sWidth-1; s++ )
{
tess.indexes[tess.numIndexes] = vertexStart + s + t * ( sWidth );
tess.numIndexes++;
tess.indexes[tess.numIndexes] = vertexStart + s + ( t + 1 ) * ( sWidth );
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] = (int)( sky_mins[0][i] * HALF_SKY_SUBDIVISIONS );
sky_mins_subd[1] = (int)( sky_mins[1][i] * HALF_SKY_SUBDIVISIONS );
sky_maxs_subd[0] = (int)( sky_maxs[0][i] * HALF_SKY_SUBDIVISIONS );
sky_maxs_subd[1] = (int)( 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 ( input->shader->sky.cloudHeight )
{
for ( i = 0; i < MAX_SHADER_STAGES; i++ )
{
if ( !tess.xstages[i] ) {
break;
}
FillCloudBox( input->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 * sqrtf( 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( void ) {
float size;
float dist;
vec3_t origin, vec1, vec2;
vec3_t temp;
if ( !backEnd.skyRenderedThisView ) {
return;
}
if ( !r_drawSun->integer ) {
return;
}
R_StateSetModelViewMatrixCountedRaw( backEnd.viewParms.world.modelMatrix );
glTranslatef (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 * 0.4;
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
R_StateSetDepthRange( 1.0, 1.0 );
// FIXME: use quad stamp
RB_BeginSurface( tr.sunShader, tess.fogNum, GL_TRIANGLES );
VectorCopy( origin, temp );
VectorSubtract( temp, vec1, temp );
VectorSubtract( temp, vec2, temp );
VectorCopy( temp, tess.xyz[tess.numVertexes] );
tess.texCoords[tess.numVertexes][0][0] = 0;
tess.texCoords[tess.numVertexes][0][1] = 0;
tess.vertexColors[tess.numVertexes][0] = 255;
tess.vertexColors[tess.numVertexes][1] = 255;
tess.vertexColors[tess.numVertexes][2] = 255;
tess.numVertexes++;
VectorCopy( origin, temp );
VectorAdd( temp, vec1, temp );
VectorSubtract( temp, vec2, temp );
VectorCopy( temp, tess.xyz[tess.numVertexes] );
tess.texCoords[tess.numVertexes][0][0] = 0;
tess.texCoords[tess.numVertexes][0][1] = 1;
tess.vertexColors[tess.numVertexes][0] = 255;
tess.vertexColors[tess.numVertexes][1] = 255;
tess.vertexColors[tess.numVertexes][2] = 255;
tess.numVertexes++;
VectorCopy( origin, temp );
VectorAdd( temp, vec1, temp );
VectorAdd( temp, vec2, temp );
VectorCopy( temp, tess.xyz[tess.numVertexes] );
tess.texCoords[tess.numVertexes][0][0] = 1;
tess.texCoords[tess.numVertexes][0][1] = 1;
tess.vertexColors[tess.numVertexes][0] = 255;
tess.vertexColors[tess.numVertexes][1] = 255;
tess.vertexColors[tess.numVertexes][2] = 255;
tess.numVertexes++;
VectorCopy( origin, temp );
VectorSubtract( temp, vec1, temp );
VectorAdd( temp, vec2, temp );
VectorCopy( temp, tess.xyz[tess.numVertexes] );
tess.texCoords[tess.numVertexes][0][0] = 1;
tess.texCoords[tess.numVertexes][0][1] = 0;
tess.vertexColors[tess.numVertexes][0] = 255;
tess.vertexColors[tess.numVertexes][1] = 255;
tess.vertexColors[tess.numVertexes][2] = 255;
tess.numVertexes++;
tess.indexes[tess.numIndexes++] = 0;
tess.indexes[tess.numIndexes++] = 1;
tess.indexes[tess.numIndexes++] = 2;
tess.indexes[tess.numIndexes++] = 0;
tess.indexes[tess.numIndexes++] = 2;
tess.indexes[tess.numIndexes++] = 3;
RB_EndSurface();
// back to normal depth range
R_StateSetDepthRange( 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
================
*/
static float s_flipMatrix[16] =
{
// convert from our coordinate system (looking down X)
// to OpenGL's coordinate system (looking down -Z)
0, 0, -1, 0,
-1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 0, 1
};
static void GetSkyRotation( affine_t *mat, bool tip_coords )
{
if( tess.shader->sky.rot_base || tess.shader->sky.rot_speed )
{
float angle = tess.shader->sky.rot_speed * tess.shaderTime + tess.shader->sky.rot_base;
const float *v = tess.shader->sky.rotAxis;
vec3_t ax;
quat_t q;
if( tip_coords )
{
ax[0] = v[0];
ax[1] = -v[2];
ax[2] = -v[1];
}
else
VectorCopy( v, ax );
Quat_AxisAngle( q, ax, DEG2RAD( angle ) );
QuatToAffine( mat, q );
}
else
Affine_Set( mat, NULL, NULL );
}
static void glMultAffine( const affine_t *mat )
{
float rawmat[16];
Matrix_SetFromAffine( rawmat, mat );
glMultMatrixf( rawmat );
}
static void ApplySkyRotation( bool tip_coords )
{
affine_t mat;
GetSkyRotation( &mat, tip_coords );
glMultAffine( &mat );
}
void RB_StageIteratorSky( void )
{
stateGroup_t sg;
if( r_fastsky->integer )
return;
GLimp_LogComment( 1, "BEGIN RB_StageIteratorSky( %s )", tess.shader->name );
sg = R_StateBeginGroup();
// 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 )
R_StateSetDepthRange( 0, 0 );
else
R_StateSetDepthRange( 1, 1 );
R_StateSetDepthMask( qfalse );
R_StateSetCull( GL_FRONT_AND_BACK );
// draw the outer skybox
if( tess.shader->sky.cube )
{
float tm[16] =
{
-1, 0, 0, 0,
0, 0, 1, 0,
0, 1, 0, 0,
0, 0, 0, 1
};
samplerState_t sampler = { GL_CLAMP_TO_EDGE_EXT, GL_CLAMP_TO_EDGE_EXT, GL_CLAMP_TO_EDGE_EXT, GL_NONE, GL_NONE, 0 };
GLimp_LogComment( 3, "Sky is Cube" );
glPushClientAttrib( GL_CLIENT_VERTEX_ARRAY_BIT );
glVertexPointer( 3, GL_FLOAT, sizeof( float ) * 4, tess.xyz );
R_StateSetActiveClientTmuUntracked( GL_TEXTURE0_ARB );
glEnableClientState( GL_TEXTURE_COORD_ARRAY );
glTexCoordPointer( 3, GL_FLOAT, sizeof( float ) * 4, tess.xyz );
R_StateSetTexture( tess.shader->sky.cube, GL_TEXTURE0_ARB );
R_StateSetBlend( tess.shader->sky.srcblend, tess.shader->sky.dstblend );
R_StateSetTextureSampler( &sampler, GL_TEXTURE0_ARB );
R_StateSetActiveTmuUntracked( GL_TEXTURE0_ARB );
glMatrixMode( GL_TEXTURE );
glPushMatrix();
tm[12] = backEnd.viewParms.or.origin[0];
tm[13] = -backEnd.viewParms.or.origin[2];
tm[14] = -backEnd.viewParms.or.origin[1];
R_StateSetActiveClientTmuUntracked( GL_TEXTURE0_ARB );
ApplySkyRotation( true );
R_StateMulTextureMatrixCountedRaw( tm, GL_TEXTURE0_ARB );
glColor4f( 1, 1, 1, 1 );
R_StateRestorePriorGroupStates( sg );
glDrawElements( tess.primType, tess.numIndexes, GL_INDEX_TYPE, tess.indexes );
R_StateSetActiveTmuUntracked( GL_TEXTURE0_ARB );
glMatrixMode( GL_TEXTURE );
glPopMatrix();
glMatrixMode( GL_MODELVIEW );
glPopClientAttrib();
}
else if( tess.shader->sky.outerbox[0] && tess.shader->sky.outerbox[0] != tr.defaultImage )
{
GLimp_LogComment( 3, "Sky is Old-Style" );
// 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 );
glColor3f( tr.identityLight, tr.identityLight, tr.identityLight );
glPushMatrix();
glTranslatef( backEnd.viewParms.or.origin[0], backEnd.viewParms.or.origin[1], backEnd.viewParms.or.origin[2] );
GL_State( 0 );
DrawSkyBox( tess.shader, sg );
glPopMatrix();
}
// generate the vertexes for all the clouds, which will be drawn
// by the generic shader routine
if( tess.shader->stages[0] )
{
GLimp_LogComment( 3, "Drawing Sky Cloud Layers" );
R_BuildCloudData( &tess );
RB_StageIteratorGeneric();
}
// note that sky was drawn so we will draw a sun later
backEnd.skyRenderedThisView = qtrue;
GLimp_LogComment( 1, "END RB_StageIteratorSky( %s )", tess.shader->name );
}
static ID_INLINE float clampf( float f, float m, float M )
{
if( f < m ) return m;
if( f > M ) return M;
return f;
}
void RB_DrawOrbit()
{
float theta, r, w, *p, l, t, r0, s;
vec4_t c;
qboolean invA = qfalse;
stateGroup_t sg = R_StateBeginGroup();
if( backEnd.currentEntity->e.renderfx & RF_ORBIT_LINE )
{
glLineWidth( backEnd.currentEntity->e.width );
}
R_StateSetBlend( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
R_StateSetDepthMask( qfalse );
R_StateSetCull( GL_FRONT_AND_BACK );
R_StateRestorePriorGroupStates( sg );
c[0] = backEnd.currentEntity->e.shaderRGBA[0] * (1.0F / 255.0F);
c[1] = backEnd.currentEntity->e.shaderRGBA[1] * (1.0F / 255.0F);
c[2] = backEnd.currentEntity->e.shaderRGBA[2] * (1.0F / 255.0F);
c[3] = backEnd.currentEntity->e.shaderRGBA[3] * (1.0F / 255.0F);
r = backEnd.currentEntity->e.radius;
if( r < 0 )
{
invA = qtrue;
r = -r;
}
p = backEnd.currentEntity->e.origin;
l = backEnd.currentEntity->e.lightingOrigin[0] / r;
if( l < 0 )
s = -1;
else
s = 1;
r0 = backEnd.currentEntity->e.rotation;
t = l / 100.0f;
w = backEnd.currentEntity->e.width;
if( w < 1 )
w = 1;
if( backEnd.currentEntity->e.renderfx & RF_ORBIT_LINE )
{
glBegin( GL_LINE_STRIP );
for( theta = 0; theta * s < fabsf( l ); theta += t )
{
float x, y, ca;
ca = theta / l;
if( !invA )
ca = 1.0F - ca;
ca *= clampf( fabsf( theta ) / DEG2RAD( 5 ), 0, 1 );
glColor4f( c[0], c[1], c[2], c[3] * ca );
x = sinf( r0 + theta );
y = cosf( r0 + theta );
glVertex3f( p[0] + x * r, p[1] + y * r, p[2] );
}
glEnd();
}
else
{
glBegin( GL_QUAD_STRIP );
for( theta = 0; theta * s < fabsf( l ); theta += t )
{
float x, y, ca;
ca = 1.0f - (theta / l);
if( invA )
ca = 1.0F - ca;
glColor4f( c[0], c[1], c[2], c[3] * ca );
x = sinf( r0 + theta );
y = cosf( r0 + theta );
glVertex3f( p[0] + x * r, p[1] + y * r, p[2] );
glVertex3f( p[0] + x * (r + w), p[1] + y * (r + w), p[2] );
}
glEnd();
}
}
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