diff options
Diffstat (limited to 'code/renderer/tr_shade_calc.c')
| -rwxr-xr-x | code/renderer/tr_shade_calc.c | 1205 |
1 files changed, 1205 insertions, 0 deletions
diff --git a/code/renderer/tr_shade_calc.c b/code/renderer/tr_shade_calc.c new file mode 100755 index 0000000..f1f0e6d --- /dev/null +++ b/code/renderer/tr_shade_calc.c @@ -0,0 +1,1205 @@ +/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+
+This file is part of Quake III Arena source code.
+
+Quake III Arena source code is free software; you can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation; either version 2 of the License,
+or (at your option) any later version.
+
+Quake III Arena source code is distributed in the hope that it will be
+useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Foobar; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+===========================================================================
+*/
+// tr_shade_calc.c
+
+#include "tr_local.h"
+
+
+#define WAVEVALUE( table, base, amplitude, phase, freq ) ((base) + table[ myftol( ( ( (phase) + tess.shaderTime * (freq) ) * FUNCTABLE_SIZE ) ) & FUNCTABLE_MASK ] * (amplitude))
+
+static float *TableForFunc( genFunc_t func )
+{
+ switch ( func )
+ {
+ case GF_SIN:
+ return tr.sinTable;
+ case GF_TRIANGLE:
+ return tr.triangleTable;
+ case GF_SQUARE:
+ return tr.squareTable;
+ case GF_SAWTOOTH:
+ return tr.sawToothTable;
+ case GF_INVERSE_SAWTOOTH:
+ return tr.inverseSawToothTable;
+ case GF_NONE:
+ default:
+ break;
+ }
+
+ ri.Error( ERR_DROP, "TableForFunc called with invalid function '%d' in shader '%s'\n", func, tess.shader->name );
+ return NULL;
+}
+
+/*
+** EvalWaveForm
+**
+** Evaluates a given waveForm_t, referencing backEnd.refdef.time directly
+*/
+static float EvalWaveForm( const waveForm_t *wf )
+{
+ float *table;
+
+ table = TableForFunc( wf->func );
+
+ return WAVEVALUE( table, wf->base, wf->amplitude, wf->phase, wf->frequency );
+}
+
+static float EvalWaveFormClamped( const waveForm_t *wf )
+{
+ float glow = EvalWaveForm( wf );
+
+ if ( glow < 0 )
+ {
+ return 0;
+ }
+
+ if ( glow > 1 )
+ {
+ return 1;
+ }
+
+ return glow;
+}
+
+/*
+** RB_CalcStretchTexCoords
+*/
+void RB_CalcStretchTexCoords( const waveForm_t *wf, float *st )
+{
+ float p;
+ texModInfo_t tmi;
+
+ p = 1.0f / EvalWaveForm( wf );
+
+ tmi.matrix[0][0] = p;
+ tmi.matrix[1][0] = 0;
+ tmi.translate[0] = 0.5f - 0.5f * p;
+
+ tmi.matrix[0][1] = 0;
+ tmi.matrix[1][1] = p;
+ tmi.translate[1] = 0.5f - 0.5f * p;
+
+ RB_CalcTransformTexCoords( &tmi, st );
+}
+
+/*
+====================================================================
+
+DEFORMATIONS
+
+====================================================================
+*/
+
+/*
+========================
+RB_CalcDeformVertexes
+
+========================
+*/
+void RB_CalcDeformVertexes( deformStage_t *ds )
+{
+ int i;
+ vec3_t offset;
+ float scale;
+ float *xyz = ( float * ) tess.xyz;
+ float *normal = ( float * ) tess.normal;
+ float *table;
+
+ if ( ds->deformationWave.frequency == 0 )
+ {
+ scale = EvalWaveForm( &ds->deformationWave );
+
+ for ( i = 0; i < tess.numVertexes; i++, xyz += 4, normal += 4 )
+ {
+ VectorScale( normal, scale, offset );
+
+ xyz[0] += offset[0];
+ xyz[1] += offset[1];
+ xyz[2] += offset[2];
+ }
+ }
+ else
+ {
+ table = TableForFunc( ds->deformationWave.func );
+
+ for ( i = 0; i < tess.numVertexes; i++, xyz += 4, normal += 4 )
+ {
+ float off = ( xyz[0] + xyz[1] + xyz[2] ) * ds->deformationSpread;
+
+ scale = WAVEVALUE( table, ds->deformationWave.base,
+ ds->deformationWave.amplitude,
+ ds->deformationWave.phase + off,
+ ds->deformationWave.frequency );
+
+ VectorScale( normal, scale, offset );
+
+ xyz[0] += offset[0];
+ xyz[1] += offset[1];
+ xyz[2] += offset[2];
+ }
+ }
+}
+
+/*
+=========================
+RB_CalcDeformNormals
+
+Wiggle the normals for wavy environment mapping
+=========================
+*/
+void RB_CalcDeformNormals( deformStage_t *ds ) {
+ int i;
+ float scale;
+ float *xyz = ( float * ) tess.xyz;
+ float *normal = ( float * ) tess.normal;
+
+ for ( i = 0; i < tess.numVertexes; i++, xyz += 4, normal += 4 ) {
+ scale = 0.98f;
+ scale = R_NoiseGet4f( xyz[0] * scale, xyz[1] * scale, xyz[2] * scale,
+ tess.shaderTime * ds->deformationWave.frequency );
+ normal[ 0 ] += ds->deformationWave.amplitude * scale;
+
+ scale = 0.98f;
+ scale = R_NoiseGet4f( 100 + xyz[0] * scale, xyz[1] * scale, xyz[2] * scale,
+ tess.shaderTime * ds->deformationWave.frequency );
+ normal[ 1 ] += ds->deformationWave.amplitude * scale;
+
+ scale = 0.98f;
+ scale = R_NoiseGet4f( 200 + xyz[0] * scale, xyz[1] * scale, xyz[2] * scale,
+ tess.shaderTime * ds->deformationWave.frequency );
+ normal[ 2 ] += ds->deformationWave.amplitude * scale;
+
+ VectorNormalizeFast( normal );
+ }
+}
+
+/*
+========================
+RB_CalcBulgeVertexes
+
+========================
+*/
+void RB_CalcBulgeVertexes( deformStage_t *ds ) {
+ int i;
+ const float *st = ( const float * ) tess.texCoords[0];
+ float *xyz = ( float * ) tess.xyz;
+ float *normal = ( float * ) tess.normal;
+ float now;
+
+ now = backEnd.refdef.time * ds->bulgeSpeed * 0.001f;
+
+ for ( i = 0; i < tess.numVertexes; i++, xyz += 4, st += 4, normal += 4 ) {
+ int off;
+ float scale;
+
+ off = (float)( FUNCTABLE_SIZE / (M_PI*2) ) * ( st[0] * ds->bulgeWidth + now );
+
+ scale = tr.sinTable[ off & FUNCTABLE_MASK ] * ds->bulgeHeight;
+
+ xyz[0] += normal[0] * scale;
+ xyz[1] += normal[1] * scale;
+ xyz[2] += normal[2] * scale;
+ }
+}
+
+
+/*
+======================
+RB_CalcMoveVertexes
+
+A deformation that can move an entire surface along a wave path
+======================
+*/
+void RB_CalcMoveVertexes( deformStage_t *ds ) {
+ int i;
+ float *xyz;
+ float *table;
+ float scale;
+ vec3_t offset;
+
+ table = TableForFunc( ds->deformationWave.func );
+
+ scale = WAVEVALUE( table, ds->deformationWave.base,
+ ds->deformationWave.amplitude,
+ ds->deformationWave.phase,
+ ds->deformationWave.frequency );
+
+ VectorScale( ds->moveVector, scale, offset );
+
+ xyz = ( float * ) tess.xyz;
+ for ( i = 0; i < tess.numVertexes; i++, xyz += 4 ) {
+ VectorAdd( xyz, offset, xyz );
+ }
+}
+
+
+/*
+=============
+DeformText
+
+Change a polygon into a bunch of text polygons
+=============
+*/
+void DeformText( const char *text ) {
+ int i;
+ vec3_t origin, width, height;
+ int len;
+ int ch;
+ byte color[4];
+ float bottom, top;
+ vec3_t mid;
+
+ height[0] = 0;
+ height[1] = 0;
+ height[2] = -1;
+ CrossProduct( tess.normal[0], height, width );
+
+ // find the midpoint of the box
+ VectorClear( mid );
+ bottom = 999999;
+ top = -999999;
+ for ( i = 0 ; i < 4 ; i++ ) {
+ VectorAdd( tess.xyz[i], mid, mid );
+ if ( tess.xyz[i][2] < bottom ) {
+ bottom = tess.xyz[i][2];
+ }
+ if ( tess.xyz[i][2] > top ) {
+ top = tess.xyz[i][2];
+ }
+ }
+ VectorScale( mid, 0.25f, origin );
+
+ // determine the individual character size
+ height[0] = 0;
+ height[1] = 0;
+ height[2] = ( top - bottom ) * 0.5f;
+
+ VectorScale( width, height[2] * -0.75f, width );
+
+ // determine the starting position
+ len = strlen( text );
+ VectorMA( origin, (len-1), width, origin );
+
+ // clear the shader indexes
+ tess.numIndexes = 0;
+ tess.numVertexes = 0;
+
+ color[0] = color[1] = color[2] = color[3] = 255;
+
+ // draw each character
+ for ( i = 0 ; i < len ; i++ ) {
+ ch = text[i];
+ ch &= 255;
+
+ if ( ch != ' ' ) {
+ int row, col;
+ float frow, fcol, size;
+
+ row = ch>>4;
+ col = ch&15;
+
+ frow = row*0.0625f;
+ fcol = col*0.0625f;
+ size = 0.0625f;
+
+ RB_AddQuadStampExt( origin, width, height, color, fcol, frow, fcol + size, frow + size );
+ }
+ VectorMA( origin, -2, width, origin );
+ }
+}
+
+/*
+==================
+GlobalVectorToLocal
+==================
+*/
+static void GlobalVectorToLocal( const vec3_t in, vec3_t out ) {
+ out[0] = DotProduct( in, backEnd.or.axis[0] );
+ out[1] = DotProduct( in, backEnd.or.axis[1] );
+ out[2] = DotProduct( in, backEnd.or.axis[2] );
+}
+
+/*
+=====================
+AutospriteDeform
+
+Assuming all the triangles for this shader are independant
+quads, rebuild them as forward facing sprites
+=====================
+*/
+static void AutospriteDeform( void ) {
+ int i;
+ int oldVerts;
+ float *xyz;
+ vec3_t mid, delta;
+ float radius;
+ vec3_t left, up;
+ vec3_t leftDir, upDir;
+
+ if ( tess.numVertexes & 3 ) {
+ ri.Printf( PRINT_WARNING, "Autosprite shader %s had odd vertex count", tess.shader->name );
+ }
+ if ( tess.numIndexes != ( tess.numVertexes >> 2 ) * 6 ) {
+ ri.Printf( PRINT_WARNING, "Autosprite shader %s had odd index count", tess.shader->name );
+ }
+
+ oldVerts = tess.numVertexes;
+ tess.numVertexes = 0;
+ tess.numIndexes = 0;
+
+ if ( backEnd.currentEntity != &tr.worldEntity ) {
+ GlobalVectorToLocal( backEnd.viewParms.or.axis[1], leftDir );
+ GlobalVectorToLocal( backEnd.viewParms.or.axis[2], upDir );
+ } else {
+ VectorCopy( backEnd.viewParms.or.axis[1], leftDir );
+ VectorCopy( backEnd.viewParms.or.axis[2], upDir );
+ }
+
+ for ( i = 0 ; i < oldVerts ; i+=4 ) {
+ // find the midpoint
+ xyz = tess.xyz[i];
+
+ mid[0] = 0.25f * (xyz[0] + xyz[4] + xyz[8] + xyz[12]);
+ mid[1] = 0.25f * (xyz[1] + xyz[5] + xyz[9] + xyz[13]);
+ mid[2] = 0.25f * (xyz[2] + xyz[6] + xyz[10] + xyz[14]);
+
+ VectorSubtract( xyz, mid, delta );
+ radius = VectorLength( delta ) * 0.707f; // / sqrt(2)
+
+ VectorScale( leftDir, radius, left );
+ VectorScale( upDir, radius, up );
+
+ if ( backEnd.viewParms.isMirror ) {
+ VectorSubtract( vec3_origin, left, left );
+ }
+
+ // compensate for scale in the axes if necessary
+ if ( backEnd.currentEntity->e.nonNormalizedAxes ) {
+ float axisLength;
+ axisLength = VectorLength( backEnd.currentEntity->e.axis[0] );
+ if ( !axisLength ) {
+ axisLength = 0;
+ } else {
+ axisLength = 1.0f / axisLength;
+ }
+ VectorScale(left, axisLength, left);
+ VectorScale(up, axisLength, up);
+ }
+
+ RB_AddQuadStamp( mid, left, up, tess.vertexColors[i] );
+ }
+}
+
+
+/*
+=====================
+Autosprite2Deform
+
+Autosprite2 will pivot a rectangular quad along the center of its long axis
+=====================
+*/
+int edgeVerts[6][2] = {
+ { 0, 1 },
+ { 0, 2 },
+ { 0, 3 },
+ { 1, 2 },
+ { 1, 3 },
+ { 2, 3 }
+};
+
+static void Autosprite2Deform( void ) {
+ int i, j, k;
+ int indexes;
+ float *xyz;
+ vec3_t forward;
+
+ if ( tess.numVertexes & 3 ) {
+ ri.Printf( PRINT_WARNING, "Autosprite2 shader %s had odd vertex count", tess.shader->name );
+ }
+ if ( tess.numIndexes != ( tess.numVertexes >> 2 ) * 6 ) {
+ ri.Printf( PRINT_WARNING, "Autosprite2 shader %s had odd index count", tess.shader->name );
+ }
+
+ if ( backEnd.currentEntity != &tr.worldEntity ) {
+ GlobalVectorToLocal( backEnd.viewParms.or.axis[0], forward );
+ } else {
+ VectorCopy( backEnd.viewParms.or.axis[0], forward );
+ }
+
+ // this is a lot of work for two triangles...
+ // we could precalculate a lot of it is an issue, but it would mess up
+ // the shader abstraction
+ for ( i = 0, indexes = 0 ; i < tess.numVertexes ; i+=4, indexes+=6 ) {
+ float lengths[2];
+ int nums[2];
+ vec3_t mid[2];
+ vec3_t major, minor;
+ float *v1, *v2;
+
+ // find the midpoint
+ xyz = tess.xyz[i];
+
+ // identify the two shortest edges
+ nums[0] = nums[1] = 0;
+ lengths[0] = lengths[1] = 999999;
+
+ for ( j = 0 ; j < 6 ; j++ ) {
+ float l;
+ vec3_t temp;
+
+ v1 = xyz + 4 * edgeVerts[j][0];
+ v2 = xyz + 4 * edgeVerts[j][1];
+
+ VectorSubtract( v1, v2, temp );
+
+ l = DotProduct( temp, temp );
+ if ( l < lengths[0] ) {
+ nums[1] = nums[0];
+ lengths[1] = lengths[0];
+ nums[0] = j;
+ lengths[0] = l;
+ } else if ( l < lengths[1] ) {
+ nums[1] = j;
+ lengths[1] = l;
+ }
+ }
+
+ for ( j = 0 ; j < 2 ; j++ ) {
+ v1 = xyz + 4 * edgeVerts[nums[j]][0];
+ v2 = xyz + 4 * edgeVerts[nums[j]][1];
+
+ mid[j][0] = 0.5f * (v1[0] + v2[0]);
+ mid[j][1] = 0.5f * (v1[1] + v2[1]);
+ mid[j][2] = 0.5f * (v1[2] + v2[2]);
+ }
+
+ // find the vector of the major axis
+ VectorSubtract( mid[1], mid[0], major );
+
+ // cross this with the view direction to get minor axis
+ CrossProduct( major, forward, minor );
+ VectorNormalize( minor );
+
+ // re-project the points
+ for ( j = 0 ; j < 2 ; j++ ) {
+ float l;
+
+ v1 = xyz + 4 * edgeVerts[nums[j]][0];
+ v2 = xyz + 4 * edgeVerts[nums[j]][1];
+
+ l = 0.5 * sqrt( lengths[j] );
+
+ // we need to see which direction this edge
+ // is used to determine direction of projection
+ for ( k = 0 ; k < 5 ; k++ ) {
+ if ( tess.indexes[ indexes + k ] == i + edgeVerts[nums[j]][0]
+ && tess.indexes[ indexes + k + 1 ] == i + edgeVerts[nums[j]][1] ) {
+ break;
+ }
+ }
+
+ if ( k == 5 ) {
+ VectorMA( mid[j], l, minor, v1 );
+ VectorMA( mid[j], -l, minor, v2 );
+ } else {
+ VectorMA( mid[j], -l, minor, v1 );
+ VectorMA( mid[j], l, minor, v2 );
+ }
+ }
+ }
+}
+
+
+/*
+=====================
+RB_DeformTessGeometry
+
+=====================
+*/
+void RB_DeformTessGeometry( void ) {
+ int i;
+ deformStage_t *ds;
+
+ for ( i = 0 ; i < tess.shader->numDeforms ; i++ ) {
+ ds = &tess.shader->deforms[ i ];
+
+ switch ( ds->deformation ) {
+ case DEFORM_NONE:
+ break;
+ case DEFORM_NORMALS:
+ RB_CalcDeformNormals( ds );
+ break;
+ case DEFORM_WAVE:
+ RB_CalcDeformVertexes( ds );
+ break;
+ case DEFORM_BULGE:
+ RB_CalcBulgeVertexes( ds );
+ break;
+ case DEFORM_MOVE:
+ RB_CalcMoveVertexes( ds );
+ break;
+ case DEFORM_PROJECTION_SHADOW:
+ RB_ProjectionShadowDeform();
+ break;
+ case DEFORM_AUTOSPRITE:
+ AutospriteDeform();
+ break;
+ case DEFORM_AUTOSPRITE2:
+ Autosprite2Deform();
+ break;
+ case DEFORM_TEXT0:
+ case DEFORM_TEXT1:
+ case DEFORM_TEXT2:
+ case DEFORM_TEXT3:
+ case DEFORM_TEXT4:
+ case DEFORM_TEXT5:
+ case DEFORM_TEXT6:
+ case DEFORM_TEXT7:
+ DeformText( backEnd.refdef.text[ds->deformation - DEFORM_TEXT0] );
+ break;
+ }
+ }
+}
+
+/*
+====================================================================
+
+COLORS
+
+====================================================================
+*/
+
+
+/*
+** RB_CalcColorFromEntity
+*/
+void RB_CalcColorFromEntity( unsigned char *dstColors )
+{
+ int i;
+ int *pColors = ( int * ) dstColors;
+ int c;
+
+ if ( !backEnd.currentEntity )
+ return;
+
+ c = * ( int * ) backEnd.currentEntity->e.shaderRGBA;
+
+ for ( i = 0; i < tess.numVertexes; i++, pColors++ )
+ {
+ *pColors = c;
+ }
+}
+
+/*
+** RB_CalcColorFromOneMinusEntity
+*/
+void RB_CalcColorFromOneMinusEntity( unsigned char *dstColors )
+{
+ int i;
+ int *pColors = ( int * ) dstColors;
+ unsigned char invModulate[3];
+ int c;
+
+ if ( !backEnd.currentEntity )
+ return;
+
+ invModulate[0] = 255 - backEnd.currentEntity->e.shaderRGBA[0];
+ invModulate[1] = 255 - backEnd.currentEntity->e.shaderRGBA[1];
+ invModulate[2] = 255 - backEnd.currentEntity->e.shaderRGBA[2];
+ invModulate[3] = 255 - backEnd.currentEntity->e.shaderRGBA[3]; // this trashes alpha, but the AGEN block fixes it
+
+ c = * ( int * ) invModulate;
+
+ for ( i = 0; i < tess.numVertexes; i++, pColors++ )
+ {
+ *pColors = * ( int * ) invModulate;
+ }
+}
+
+/*
+** RB_CalcAlphaFromEntity
+*/
+void RB_CalcAlphaFromEntity( unsigned char *dstColors )
+{
+ int i;
+
+ if ( !backEnd.currentEntity )
+ return;
+
+ dstColors += 3;
+
+ for ( i = 0; i < tess.numVertexes; i++, dstColors += 4 )
+ {
+ *dstColors = backEnd.currentEntity->e.shaderRGBA[3];
+ }
+}
+
+/*
+** RB_CalcAlphaFromOneMinusEntity
+*/
+void RB_CalcAlphaFromOneMinusEntity( unsigned char *dstColors )
+{
+ int i;
+
+ if ( !backEnd.currentEntity )
+ return;
+
+ dstColors += 3;
+
+ for ( i = 0; i < tess.numVertexes; i++, dstColors += 4 )
+ {
+ *dstColors = 0xff - backEnd.currentEntity->e.shaderRGBA[3];
+ }
+}
+
+/*
+** RB_CalcWaveColor
+*/
+void RB_CalcWaveColor( const waveForm_t *wf, unsigned char *dstColors )
+{
+ int i;
+ int v;
+ float glow;
+ int *colors = ( int * ) dstColors;
+ byte color[4];
+
+
+ if ( wf->func == GF_NOISE ) {
+ glow = wf->base + R_NoiseGet4f( 0, 0, 0, ( tess.shaderTime + wf->phase ) * wf->frequency ) * wf->amplitude;
+ } else {
+ glow = EvalWaveForm( wf ) * tr.identityLight;
+ }
+
+ if ( glow < 0 ) {
+ glow = 0;
+ }
+ else if ( glow > 1 ) {
+ glow = 1;
+ }
+
+ v = myftol( 255 * glow );
+ color[0] = color[1] = color[2] = v;
+ color[3] = 255;
+ v = *(int *)color;
+
+ for ( i = 0; i < tess.numVertexes; i++, colors++ ) {
+ *colors = v;
+ }
+}
+
+/*
+** RB_CalcWaveAlpha
+*/
+void RB_CalcWaveAlpha( const waveForm_t *wf, unsigned char *dstColors )
+{
+ int i;
+ int v;
+ float glow;
+
+ glow = EvalWaveFormClamped( wf );
+
+ v = 255 * glow;
+
+ for ( i = 0; i < tess.numVertexes; i++, dstColors += 4 )
+ {
+ dstColors[3] = v;
+ }
+}
+
+/*
+** RB_CalcModulateColorsByFog
+*/
+void RB_CalcModulateColorsByFog( unsigned char *colors ) {
+ int i;
+ float texCoords[SHADER_MAX_VERTEXES][2];
+
+ // calculate texcoords so we can derive density
+ // this is not wasted, because it would only have
+ // been previously called if the surface was opaque
+ RB_CalcFogTexCoords( texCoords[0] );
+
+ for ( i = 0; i < tess.numVertexes; i++, colors += 4 ) {
+ float f = 1.0 - R_FogFactor( texCoords[i][0], texCoords[i][1] );
+ colors[0] *= f;
+ colors[1] *= f;
+ colors[2] *= f;
+ }
+}
+
+/*
+** RB_CalcModulateAlphasByFog
+*/
+void RB_CalcModulateAlphasByFog( unsigned char *colors ) {
+ int i;
+ float texCoords[SHADER_MAX_VERTEXES][2];
+
+ // calculate texcoords so we can derive density
+ // this is not wasted, because it would only have
+ // been previously called if the surface was opaque
+ RB_CalcFogTexCoords( texCoords[0] );
+
+ for ( i = 0; i < tess.numVertexes; i++, colors += 4 ) {
+ float f = 1.0 - R_FogFactor( texCoords[i][0], texCoords[i][1] );
+ colors[3] *= f;
+ }
+}
+
+/*
+** RB_CalcModulateRGBAsByFog
+*/
+void RB_CalcModulateRGBAsByFog( unsigned char *colors ) {
+ int i;
+ float texCoords[SHADER_MAX_VERTEXES][2];
+
+ // calculate texcoords so we can derive density
+ // this is not wasted, because it would only have
+ // been previously called if the surface was opaque
+ RB_CalcFogTexCoords( texCoords[0] );
+
+ for ( i = 0; i < tess.numVertexes; i++, colors += 4 ) {
+ float f = 1.0 - R_FogFactor( texCoords[i][0], texCoords[i][1] );
+ colors[0] *= f;
+ colors[1] *= f;
+ colors[2] *= f;
+ colors[3] *= f;
+ }
+}
+
+
+/*
+====================================================================
+
+TEX COORDS
+
+====================================================================
+*/
+
+/*
+========================
+RB_CalcFogTexCoords
+
+To do the clipped fog plane really correctly, we should use
+projected textures, but I don't trust the drivers and it
+doesn't fit our shader data.
+========================
+*/
+void RB_CalcFogTexCoords( float *st ) {
+ int i;
+ float *v;
+ float s, t;
+ float eyeT;
+ qboolean eyeOutside;
+ fog_t *fog;
+ vec3_t local;
+ vec4_t fogDistanceVector, fogDepthVector;
+
+ fog = tr.world->fogs + tess.fogNum;
+
+ // all fogging distance is based on world Z units
+ VectorSubtract( backEnd.or.origin, backEnd.viewParms.or.origin, local );
+ fogDistanceVector[0] = -backEnd.or.modelMatrix[2];
+ fogDistanceVector[1] = -backEnd.or.modelMatrix[6];
+ fogDistanceVector[2] = -backEnd.or.modelMatrix[10];
+ fogDistanceVector[3] = DotProduct( local, backEnd.viewParms.or.axis[0] );
+
+ // scale the fog vectors based on the fog's thickness
+ fogDistanceVector[0] *= fog->tcScale;
+ fogDistanceVector[1] *= fog->tcScale;
+ fogDistanceVector[2] *= fog->tcScale;
+ fogDistanceVector[3] *= fog->tcScale;
+
+ // rotate the gradient vector for this orientation
+ if ( fog->hasSurface ) {
+ fogDepthVector[0] = fog->surface[0] * backEnd.or.axis[0][0] +
+ fog->surface[1] * backEnd.or.axis[0][1] + fog->surface[2] * backEnd.or.axis[0][2];
+ fogDepthVector[1] = fog->surface[0] * backEnd.or.axis[1][0] +
+ fog->surface[1] * backEnd.or.axis[1][1] + fog->surface[2] * backEnd.or.axis[1][2];
+ fogDepthVector[2] = fog->surface[0] * backEnd.or.axis[2][0] +
+ fog->surface[1] * backEnd.or.axis[2][1] + fog->surface[2] * backEnd.or.axis[2][2];
+ fogDepthVector[3] = -fog->surface[3] + DotProduct( backEnd.or.origin, fog->surface );
+
+ eyeT = DotProduct( backEnd.or.viewOrigin, fogDepthVector ) + fogDepthVector[3];
+ } else {
+ eyeT = 1; // non-surface fog always has eye inside
+ }
+
+ // see if the viewpoint is outside
+ // this is needed for clipping distance even for constant fog
+
+ if ( eyeT < 0 ) {
+ eyeOutside = qtrue;
+ } else {
+ eyeOutside = qfalse;
+ }
+
+ fogDistanceVector[3] += 1.0/512;
+
+ // calculate density for each point
+ for (i = 0, v = tess.xyz[0] ; i < tess.numVertexes ; i++, v += 4) {
+ // calculate the length in fog
+ s = DotProduct( v, fogDistanceVector ) + fogDistanceVector[3];
+ t = DotProduct( v, fogDepthVector ) + fogDepthVector[3];
+
+ // partially clipped fogs use the T axis
+ if ( eyeOutside ) {
+ if ( t < 1.0 ) {
+ t = 1.0/32; // point is outside, so no fogging
+ } else {
+ t = 1.0/32 + 30.0/32 * t / ( t - eyeT ); // cut the distance at the fog plane
+ }
+ } else {
+ if ( t < 0 ) {
+ t = 1.0/32; // point is outside, so no fogging
+ } else {
+ t = 31.0/32;
+ }
+ }
+
+ st[0] = s;
+ st[1] = t;
+ st += 2;
+ }
+}
+
+
+
+/*
+** RB_CalcEnvironmentTexCoords
+*/
+void RB_CalcEnvironmentTexCoords( float *st )
+{
+ int i;
+ float *v, *normal;
+ vec3_t viewer, reflected;
+ float d;
+
+ v = tess.xyz[0];
+ normal = tess.normal[0];
+
+ for (i = 0 ; i < tess.numVertexes ; i++, v += 4, normal += 4, st += 2 )
+ {
+ VectorSubtract (backEnd.or.viewOrigin, v, viewer);
+ VectorNormalizeFast (viewer);
+
+ d = DotProduct (normal, viewer);
+
+ reflected[0] = normal[0]*2*d - viewer[0];
+ reflected[1] = normal[1]*2*d - viewer[1];
+ reflected[2] = normal[2]*2*d - viewer[2];
+
+ st[0] = 0.5 + reflected[1] * 0.5;
+ st[1] = 0.5 - reflected[2] * 0.5;
+ }
+}
+
+/*
+** RB_CalcTurbulentTexCoords
+*/
+void RB_CalcTurbulentTexCoords( const waveForm_t *wf, float *st )
+{
+ int i;
+ float now;
+
+ now = ( wf->phase + tess.shaderTime * wf->frequency );
+
+ for ( i = 0; i < tess.numVertexes; i++, st += 2 )
+ {
+ float s = st[0];
+ float t = st[1];
+
+ st[0] = s + tr.sinTable[ ( ( int ) ( ( ( tess.xyz[i][0] + tess.xyz[i][2] )* 1.0/128 * 0.125 + now ) * FUNCTABLE_SIZE ) ) & ( FUNCTABLE_MASK ) ] * wf->amplitude;
+ st[1] = t + tr.sinTable[ ( ( int ) ( ( tess.xyz[i][1] * 1.0/128 * 0.125 + now ) * FUNCTABLE_SIZE ) ) & ( FUNCTABLE_MASK ) ] * wf->amplitude;
+ }
+}
+
+/*
+** RB_CalcScaleTexCoords
+*/
+void RB_CalcScaleTexCoords( const float scale[2], float *st )
+{
+ int i;
+
+ for ( i = 0; i < tess.numVertexes; i++, st += 2 )
+ {
+ st[0] *= scale[0];
+ st[1] *= scale[1];
+ }
+}
+
+/*
+** RB_CalcScrollTexCoords
+*/
+void RB_CalcScrollTexCoords( const float scrollSpeed[2], float *st )
+{
+ int i;
+ float timeScale = tess.shaderTime;
+ float adjustedScrollS, adjustedScrollT;
+
+ adjustedScrollS = scrollSpeed[0] * timeScale;
+ adjustedScrollT = scrollSpeed[1] * timeScale;
+
+ // clamp so coordinates don't continuously get larger, causing problems
+ // with hardware limits
+ adjustedScrollS = adjustedScrollS - floor( adjustedScrollS );
+ adjustedScrollT = adjustedScrollT - floor( adjustedScrollT );
+
+ for ( i = 0; i < tess.numVertexes; i++, st += 2 )
+ {
+ st[0] += adjustedScrollS;
+ st[1] += adjustedScrollT;
+ }
+}
+
+/*
+** RB_CalcTransformTexCoords
+*/
+void RB_CalcTransformTexCoords( const texModInfo_t *tmi, float *st )
+{
+ int i;
+
+ for ( i = 0; i < tess.numVertexes; i++, st += 2 )
+ {
+ float s = st[0];
+ float t = st[1];
+
+ st[0] = s * tmi->matrix[0][0] + t * tmi->matrix[1][0] + tmi->translate[0];
+ st[1] = s * tmi->matrix[0][1] + t * tmi->matrix[1][1] + tmi->translate[1];
+ }
+}
+
+/*
+** RB_CalcRotateTexCoords
+*/
+void RB_CalcRotateTexCoords( float degsPerSecond, float *st )
+{
+ float timeScale = tess.shaderTime;
+ float degs;
+ int index;
+ float sinValue, cosValue;
+ texModInfo_t tmi;
+
+ degs = -degsPerSecond * timeScale;
+ index = degs * ( FUNCTABLE_SIZE / 360.0f );
+
+ sinValue = tr.sinTable[ index & FUNCTABLE_MASK ];
+ cosValue = tr.sinTable[ ( index + FUNCTABLE_SIZE / 4 ) & FUNCTABLE_MASK ];
+
+ tmi.matrix[0][0] = cosValue;
+ tmi.matrix[1][0] = -sinValue;
+ tmi.translate[0] = 0.5 - 0.5 * cosValue + 0.5 * sinValue;
+
+ tmi.matrix[0][1] = sinValue;
+ tmi.matrix[1][1] = cosValue;
+ tmi.translate[1] = 0.5 - 0.5 * sinValue - 0.5 * cosValue;
+
+ RB_CalcTransformTexCoords( &tmi, st );
+}
+
+
+
+
+
+
+#if id386 && !( (defined __linux__ || defined __FreeBSD__ ) && (defined __i386__ ) ) // rb010123
+
+long myftol( float f ) {
+ static int tmp;
+ __asm fld f
+ __asm fistp tmp
+ __asm mov eax, tmp
+}
+
+#endif
+
+/*
+** RB_CalcSpecularAlpha
+**
+** Calculates specular coefficient and places it in the alpha channel
+*/
+vec3_t lightOrigin = { -960, 1980, 96 }; // FIXME: track dynamically
+
+void RB_CalcSpecularAlpha( unsigned char *alphas ) {
+ int i;
+ float *v, *normal;
+ vec3_t viewer, reflected;
+ float l, d;
+ int b;
+ vec3_t lightDir;
+ int numVertexes;
+
+ v = tess.xyz[0];
+ normal = tess.normal[0];
+
+ alphas += 3;
+
+ numVertexes = tess.numVertexes;
+ for (i = 0 ; i < numVertexes ; i++, v += 4, normal += 4, alphas += 4) {
+ float ilength;
+
+ VectorSubtract( lightOrigin, v, lightDir );
+// ilength = Q_rsqrt( DotProduct( lightDir, lightDir ) );
+ VectorNormalizeFast( lightDir );
+
+ // calculate the specular color
+ d = DotProduct (normal, lightDir);
+// d *= ilength;
+
+ // we don't optimize for the d < 0 case since this tends to
+ // cause visual artifacts such as faceted "snapping"
+ reflected[0] = normal[0]*2*d - lightDir[0];
+ reflected[1] = normal[1]*2*d - lightDir[1];
+ reflected[2] = normal[2]*2*d - lightDir[2];
+
+ VectorSubtract (backEnd.or.viewOrigin, v, viewer);
+ ilength = Q_rsqrt( DotProduct( viewer, viewer ) );
+ l = DotProduct (reflected, viewer);
+ l *= ilength;
+
+ if (l < 0) {
+ b = 0;
+ } else {
+ l = l*l;
+ l = l*l;
+ b = l * 255;
+ if (b > 255) {
+ b = 255;
+ }
+ }
+
+ *alphas = b;
+ }
+}
+
+/*
+** RB_CalcDiffuseColor
+**
+** The basic vertex lighting calc
+*/
+void RB_CalcDiffuseColor( unsigned char *colors )
+{
+ int i, j;
+ float *v, *normal;
+ float incoming;
+ trRefEntity_t *ent;
+ int ambientLightInt;
+ vec3_t ambientLight;
+ vec3_t lightDir;
+ vec3_t directedLight;
+ int numVertexes;
+#if idppc_altivec
+ vector unsigned char vSel = (vector unsigned char)(0x00, 0x00, 0x00, 0xff,
+ 0x00, 0x00, 0x00, 0xff,
+ 0x00, 0x00, 0x00, 0xff,
+ 0x00, 0x00, 0x00, 0xff);
+ vector float ambientLightVec;
+ vector float directedLightVec;
+ vector float lightDirVec;
+ vector float normalVec0, normalVec1;
+ vector float incomingVec0, incomingVec1, incomingVec2;
+ vector float zero, jVec;
+ vector signed int jVecInt;
+ vector signed short jVecShort;
+ vector unsigned char jVecChar, normalPerm;
+#endif
+ ent = backEnd.currentEntity;
+ ambientLightInt = ent->ambientLightInt;
+#if idppc_altivec
+ // A lot of this could be simplified if we made sure
+ // entities light info was 16-byte aligned.
+ jVecChar = vec_lvsl(0, ent->ambientLight);
+ ambientLightVec = vec_ld(0, (vector float *)ent->ambientLight);
+ jVec = vec_ld(11, (vector float *)ent->ambientLight);
+ ambientLightVec = vec_perm(ambientLightVec,jVec,jVecChar);
+
+ jVecChar = vec_lvsl(0, ent->directedLight);
+ directedLightVec = vec_ld(0,(vector float *)ent->directedLight);
+ jVec = vec_ld(11,(vector float *)ent->directedLight);
+ directedLightVec = vec_perm(directedLightVec,jVec,jVecChar);
+
+ jVecChar = vec_lvsl(0, ent->lightDir);
+ lightDirVec = vec_ld(0,(vector float *)ent->lightDir);
+ jVec = vec_ld(11,(vector float *)ent->lightDir);
+ lightDirVec = vec_perm(lightDirVec,jVec,jVecChar);
+
+ zero = (vector float)vec_splat_s8(0);
+ VectorCopy( ent->lightDir, lightDir );
+#else
+ VectorCopy( ent->ambientLight, ambientLight );
+ VectorCopy( ent->directedLight, directedLight );
+ VectorCopy( ent->lightDir, lightDir );
+#endif
+
+ v = tess.xyz[0];
+ normal = tess.normal[0];
+
+#if idppc_altivec
+ normalPerm = vec_lvsl(0,normal);
+#endif
+ numVertexes = tess.numVertexes;
+ for (i = 0 ; i < numVertexes ; i++, v += 4, normal += 4) {
+#if idppc_altivec
+ normalVec0 = vec_ld(0,(vector float *)normal);
+ normalVec1 = vec_ld(11,(vector float *)normal);
+ normalVec0 = vec_perm(normalVec0,normalVec1,normalPerm);
+ incomingVec0 = vec_madd(normalVec0, lightDirVec, zero);
+ incomingVec1 = vec_sld(incomingVec0,incomingVec0,4);
+ incomingVec2 = vec_add(incomingVec0,incomingVec1);
+ incomingVec1 = vec_sld(incomingVec1,incomingVec1,4);
+ incomingVec2 = vec_add(incomingVec2,incomingVec1);
+ incomingVec0 = vec_splat(incomingVec2,0);
+ incomingVec0 = vec_max(incomingVec0,zero);
+ normalPerm = vec_lvsl(12,normal);
+ jVec = vec_madd(incomingVec0, directedLightVec, ambientLightVec);
+ jVecInt = vec_cts(jVec,0); // RGBx
+ jVecShort = vec_pack(jVecInt,jVecInt); // RGBxRGBx
+ jVecChar = vec_packsu(jVecShort,jVecShort); // RGBxRGBxRGBxRGBx
+ jVecChar = vec_sel(jVecChar,vSel,vSel); // RGBARGBARGBARGBA replace alpha with 255
+ vec_ste((vector unsigned int)jVecChar,0,(unsigned int *)&colors[i*4]); // store color
+#else
+ incoming = DotProduct (normal, lightDir);
+ if ( incoming <= 0 ) {
+ *(int *)&colors[i*4] = ambientLightInt;
+ continue;
+ }
+ j = myftol( ambientLight[0] + incoming * directedLight[0] );
+ if ( j > 255 ) {
+ j = 255;
+ }
+ colors[i*4+0] = j;
+
+ j = myftol( ambientLight[1] + incoming * directedLight[1] );
+ if ( j > 255 ) {
+ j = 255;
+ }
+ colors[i*4+1] = j;
+
+ j = myftol( ambientLight[2] + incoming * directedLight[2] );
+ if ( j > 255 ) {
+ j = 255;
+ }
+ colors[i*4+2] = j;
+
+ colors[i*4+3] = 255;
+#endif
+ }
+}
+
|