create tremded branch

1 files changed, 843 insertions, 0 deletions

diff --git a/src/renderergl2/tr_shade_calc.cpp b/src/renderergl2/tr_shade_calc.cpp
new file mode 100644
index 0000000..182020b
--- /dev/null
+++ b/src/renderergl2/tr_shade_calc.cpp
@@ -0,0 +1,843 @@
+/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+Copyright (C) 2000-2013 Darklegion Development
+Copyright (C) 2015-2019 GrangerHub
+
+This file is part of Tremulous.
+
+Tremulous 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 3 of the License,
+or (at your option) any later version.
+
+Tremulous 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 Tremulous; if not, see <https://www.gnu.org/licenses/>
+
+===========================================================================
+*/
+// tr_shade_calc.c
+
+#include "tr_local.h"
+#if idppc_altivec && !defined(__APPLE__)
+#include <altivec.h>
+#endif
+
+
+#define	WAVEVALUE( table, base, amplitude, phase, freq )  ((base) + table[ static_cast<int64_t>( ( ( (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'", 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_CalcStretchTexMatrix
+*/
+void RB_CalcStretchTexMatrix( const waveForm_t *wf, float *matrix )
+{
+	float p;
+
+	p = 1.0f / EvalWaveForm( wf );
+
+	matrix[0] = p; matrix[2] = 0; matrix[4] = 0.5f - 0.5f * p;
+	matrix[1] = 0; matrix[3] = p; matrix[5] = 0.5f - 0.5f * p;
+}
+
+/*
+====================================================================
+
+DEFORMATIONS
+
+====================================================================
+*/
+
+/*
+========================
+RB_CalcDeformVertexes
+
+========================
+*/
+void RB_CalcDeformVertexes( deformStage_t *ds )
+{
+	int i;
+	vec3_t	offset;
+	float	scale;
+	float	*xyz = ( float * ) tess.xyz;
+	int16_t	*normal = tess.normal[0];
+	float	*table;
+
+	if ( ds->deformationWave.frequency == 0 )
+	{
+		scale = EvalWaveForm( &ds->deformationWave );
+
+		for ( i = 0; i < tess.numVertexes; i++, xyz += 4, normal += 4 )
+		{
+			R_VaoUnpackNormal(offset, normal);
+			
+			xyz[0] += offset[0] * scale;
+			xyz[1] += offset[1] * scale;
+			xyz[2] += offset[2] * scale;
+		}
+	}
+	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 );
+
+			R_VaoUnpackNormal(offset, normal);
+
+			xyz[0] += offset[0] * scale;
+			xyz[1] += offset[1] * scale;
+			xyz[2] += offset[2] * scale;
+		}
+	}
+}
+
+/*
+=========================
+RB_CalcDeformNormals
+
+Wiggle the normals for wavy environment mapping
+=========================
+*/
+void RB_CalcDeformNormals( deformStage_t *ds ) {
+	int i;
+	float	scale;
+	float	*xyz = ( float * ) tess.xyz;
+	int16_t *normal = tess.normal[0];
+
+	for ( i = 0; i < tess.numVertexes; i++, xyz += 4, normal += 4 ) {
+		vec3_t fNormal;
+
+		R_VaoUnpackNormal(fNormal, normal);
+
+		scale = 0.98f;
+		scale = R_NoiseGet4f( xyz[0] * scale, xyz[1] * scale, xyz[2] * scale,
+			tess.shaderTime * ds->deformationWave.frequency );
+		fNormal[ 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 );
+		fNormal[ 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 );
+		fNormal[ 2 ] += ds->deformationWave.amplitude * scale;
+
+		VectorNormalizeFast( fNormal );
+
+		R_VaoPackNormal(normal, fNormal);
+	}
+}
+
+/*
+========================
+RB_CalcBulgeVertexes
+
+========================
+*/
+void RB_CalcBulgeVertexes( deformStage_t *ds ) {
+	int i;
+	const float *st = ( const float * ) tess.texCoords[0];
+	float		*xyz = ( float * ) tess.xyz;
+	int16_t	*normal = tess.normal[0];
+
+	double now = backEnd.refdef.time * 0.001 * ds->bulgeSpeed;
+
+	for ( i = 0; i < tess.numVertexes; i++, xyz += 4, st += 2, normal += 4 ) {
+		int64_t	off;
+		float scale;
+		vec3_t fNormal;
+
+		R_VaoUnpackNormal(fNormal, normal);
+
+		off = (float)( FUNCTABLE_SIZE / (M_PI*2) ) * ( st[0] * ds->bulgeWidth + now );
+
+		scale = tr.sinTable[ off & FUNCTABLE_MASK ] * ds->bulgeHeight;
+			
+		xyz[0] += fNormal[0] * scale;
+		xyz[1] += fNormal[1] * scale;
+		xyz[2] += fNormal[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;
+	float	color[4];
+	float	bottom, top;
+	vec3_t	mid;
+	vec3_t fNormal;
+
+	height[0] = 0;
+	height[1] = 0;
+	height[2] = -1;
+
+	R_VaoUnpackNormal(fNormal, tess.normal[0]);
+	CrossProduct( fNormal, 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;
+	tess.firstIndex = 0;
+
+	color[0] = color[1] = color[2] = color[3] = 1.0f;
+
+	// 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.orientation.axis[0] );
+	out[1] = DotProduct( in, backEnd.orientation.axis[1] );
+	out[2] = DotProduct( in, backEnd.orientation.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\n", tess.shader->name );
+	}
+	if ( tess.numIndexes != ( tess.numVertexes >> 2 ) * 6 ) {
+		ri.Printf( PRINT_WARNING, "Autosprite shader %s had odd index count\n", tess.shader->name );
+	}
+
+	oldVerts = tess.numVertexes;
+	tess.numVertexes = 0;
+	tess.numIndexes = 0;
+	tess.firstIndex = 0;
+
+	if ( backEnd.currentEntity != &tr.worldEntity ) {
+		GlobalVectorToLocal( backEnd.viewParms.orientation.axis[1], leftDir );
+		GlobalVectorToLocal( backEnd.viewParms.orientation.axis[2], upDir );
+	} else {
+		VectorCopy( backEnd.viewParms.orientation.axis[1], leftDir );
+		VectorCopy( backEnd.viewParms.orientation.axis[2], upDir );
+	}
+
+	for ( i = 0 ; i < oldVerts ; i+=4 ) {
+		vec4_t color;
+		// 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);
+    }
+
+		VectorScale4(tess.color[i], 1.0f / 65535.0f, color);
+		RB_AddQuadStamp( mid, left, up, color );
+	}
+}
+
+
+/*
+=====================
+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\n", tess.shader->name );
+	}
+	if ( tess.numIndexes != ( tess.numVertexes >> 2 ) * 6 ) {
+		ri.Printf( PRINT_WARNING, "Autosprite2 shader %s had odd index count\n", tess.shader->name );
+	}
+
+	if ( backEnd.currentEntity != &tr.worldEntity ) {
+		GlobalVectorToLocal( backEnd.viewParms.orientation.axis[0], forward );
+	} else {
+		VectorCopy( backEnd.viewParms.orientation.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;
+
+	if(!ShaderRequiresCPUDeforms(tess.shader))
+	{
+		// we don't need the following CPU deforms
+		return;
+	}
+
+	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_CalcWaveColorSingle
+*/
+float RB_CalcWaveColorSingle( const waveForm_t *wf )
+{
+	float glow;
+
+	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;
+	}
+
+	return glow;
+}
+
+/*
+** RB_CalcWaveAlphaSingle
+*/
+float RB_CalcWaveAlphaSingle( const waveForm_t *wf )
+{
+	return EvalWaveFormClamped( wf );
+}
+
+/*
+** RB_CalcModulateColorsByFog
+*/
+void RB_CalcModulateColorsByFog( unsigned char *colors ) {
+	int		i;
+	float	texCoords[SHADER_MAX_VERTEXES][2] = {{0.0f}};
+
+	// 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;
+	}
+}
+
+
+/*
+====================================================================
+
+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;
+	bool	    eyeOutside;
+	fog_t		*fog;
+	vec3_t		local;
+	vec4_t		fogDistanceVector, fogDepthVector = {0, 0, 0, 0};
+
+	fog = tr.world->fogs + tess.fogNum;
+
+	// all fogging distance is based on world Z units
+	VectorSubtract( backEnd.orientation.origin, backEnd.viewParms.orientation.origin, local );
+	fogDistanceVector[0] = -backEnd.orientation.modelMatrix[2];
+	fogDistanceVector[1] = -backEnd.orientation.modelMatrix[6];
+	fogDistanceVector[2] = -backEnd.orientation.modelMatrix[10];
+	fogDistanceVector[3] = DotProduct( local, backEnd.viewParms.orientation.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.orientation.axis[0][0] + 
+			fog->surface[1] * backEnd.orientation.axis[0][1] + fog->surface[2] * backEnd.orientation.axis[0][2];
+		fogDepthVector[1] = fog->surface[0] * backEnd.orientation.axis[1][0] + 
+			fog->surface[1] * backEnd.orientation.axis[1][1] + fog->surface[2] * backEnd.orientation.axis[1][2];
+		fogDepthVector[2] = fog->surface[0] * backEnd.orientation.axis[2][0] + 
+			fog->surface[1] * backEnd.orientation.axis[2][1] + fog->surface[2] * backEnd.orientation.axis[2][2];
+		fogDepthVector[3] = -fog->surface[3] + DotProduct( backEnd.orientation.origin, fog->surface );
+
+		eyeT = DotProduct( backEnd.orientation.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 = true;
+	} else {
+		eyeOutside = false;
+	}
+
+	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_CalcTurbulentFactors
+*/
+void RB_CalcTurbulentFactors( const waveForm_t *wf, float *amplitude, float *now )
+{
+	*now = wf->phase + tess.shaderTime * wf->frequency;
+	*amplitude = wf->amplitude;
+}
+
+/*
+** RB_CalcScaleTexMatrix
+*/
+void RB_CalcScaleTexMatrix( const float scale[2], float *matrix )
+{
+	matrix[0] = scale[0]; matrix[2] = 0.0f;     matrix[4] = 0.0f;
+	matrix[1] = 0.0f;     matrix[3] = scale[1]; matrix[5] = 0.0f;
+}
+
+/*
+** RB_CalcScrollTexMatrix
+*/
+void RB_CalcScrollTexMatrix( const float scrollSpeed[2], float *matrix )
+{
+	double timeScale = tess.shaderTime;
+	double adjustedScrollS = scrollSpeed[0] * timeScale;
+	double adjustedScrollT = scrollSpeed[1] * timeScale;
+
+	// clamp so coordinates don't continuously get larger, causing problems
+	// with hardware limits
+	adjustedScrollS -= floor( adjustedScrollS );
+	adjustedScrollT -= floor( adjustedScrollT );
+
+	matrix[0] = 1.0f; matrix[2] = 0.0f; matrix[4] = adjustedScrollS;
+	matrix[1] = 0.0f; matrix[3] = 1.0f; matrix[5] = adjustedScrollT;
+}
+
+/*
+** RB_CalcTransformTexMatrix
+*/
+void RB_CalcTransformTexMatrix( const texModInfo_t *tmi, float *matrix  )
+{
+	matrix[0] = tmi->matrix[0][0]; matrix[2] = tmi->matrix[1][0]; matrix[4] = tmi->translate[0];
+	matrix[1] = tmi->matrix[0][1]; matrix[3] = tmi->matrix[1][1]; matrix[5] = tmi->translate[1];
+}
+
+/*
+** RB_CalcRotateTexMatrix
+*/
+void RB_CalcRotateTexMatrix( float degsPerSecond, float *matrix )
+{
+	double timeScale = tess.shaderTime;
+	double degs;
+	float sinValue, cosValue;
+
+	degs = -degsPerSecond * timeScale;
+	int i = degs * ( FUNCTABLE_SIZE / 360.0f );
+
+	sinValue = tr.sinTable[ i & FUNCTABLE_MASK ];
+	cosValue = tr.sinTable[ ( i + FUNCTABLE_SIZE / 4 ) & FUNCTABLE_MASK ];
+
+	matrix[0] = cosValue; matrix[2] = -sinValue; matrix[4] = 0.5 - 0.5 * cosValue + 0.5 * sinValue;
+	matrix[1] = sinValue; matrix[3] = cosValue;  matrix[5] = 0.5 - 0.5 * sinValue - 0.5 * cosValue;
+}
+
+bool ShaderRequiresCPUDeforms(const shader_t * shader)
+{
+       if(shader->numDeforms)
+	   {
+		   const deformStage_t *ds = &shader->deforms[0];
+
+		   if (shader->numDeforms > 1)
+			   return true;
+
+		   switch (ds->deformation)
+		   {
+			   case DEFORM_WAVE:
+			   case DEFORM_BULGE:
+				   // need CPU deforms at high level-times to avoid floating point percision loss
+				   return ( backEnd.refdef.floatTime != (float)backEnd.refdef.floatTime );
+
+			   default:
+				   return true;
+		   }
+	   }
+
+       return false;
+}