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NV20VolRen3D2.cpp
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NV20VolRen3D2.cpp
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// ________ ____ ___
// | \ / | / /
// +---+ \/ |/ /
// +--+| |\ /| <
// | || | \ / | |\ \
// | | \/ | | \ \
// \_____| |__| \__\
// Copyright 2001
// Joe Michael Kniss
// << jmk@cs.utah.edu >>
// "All Your Base are Belong to Us"
//-------------------------------------------------------------------------
// NV20VolRen3D2.cpp: implementation of the NV20VolRen3D2 class.
//
//////////////////////////////////////////////////////////////////////
#ifdef WIN32
#include <windows.h>
#endif
#include "NV20VolRen3D2.h"
#include <iostream.h>
#include "VectorMath.h"
#include "glUE.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
NV20VolRen3D2::NV20VolRen3D2()
{
go = 0;
}
NV20VolRen3D2::~NV20VolRen3D2()
{
}
//================================================================= INIT
//======================================================================
void NV20VolRen3D2::init()
{
if(gluvv.mv){
go = 1;
createVolumes();
create2DDepTex();
createShadowTex();
if(!(pbuff = new PBuffer(gluvv.light.buffsz[0], gluvv.light.buffsz[1],
GLUT_SINGLE | GLUT_RGBA))){
cerr << "ERROR: PBuffer intialization failed!" << endl;
} else {
pbuff->Initialize(true);
pbuff->MakeCurrent();
glClearColor( 0.0, 0.0, 0.0, 0.0 );
glMatrixMode( GL_PROJECTION );
glOrtho(0,gluvv.light.buffsz[0],0,gluvv.light.buffsz[1],1,3);
glMatrixMode(GL_MODELVIEW);
gluLookAt(0,0,2,
0,0,0,
0,1,0);
MakeCurrent();
cerr << "PBuffer intialization succeded" << endl;
}
}
cerr << "Using the Shadow Renderer!!!!!!!" << endl;
}
//================================================================= DRAW
//======================================================================
void NV20VolRen3D2::draw()
{
if(!go) return;
renderVolume();
//renderSlice();
}
//======================================================== Render Volume
//======================================================================
//========== NOTES ===========================================
// Standard brick vertex ordering:
//
// (011) (111)
// 6 +---------+ 7 Where 1's are the size of the brick
// /| /| allong that axis
// / | / |
// (001)/ |(101) / |
// 4 +---------+ 5 |
// | | | |(110) z axis
// | 2 +-----+---+ 3 ^
// | /(010) | / | y axis
// | / | / | /
// |/ |/ |/
// 0 +---------+ 1 +-------> x axis
// (000) (100)
//
void NV20VolRen3D2::renderVolume()
{
if(gluvv.picking){
return;
}
//-------------- Re-Scale Alpha values ---------------------------------
if(gluvv.volren.scaleAlphas){
if((lastSamp != gluvv.volren.sampleRate)||(gluvv.volren.loadTLUT)){ //see if the sample rate changed
if((lastGoodSamp != gluvv.volren.goodSamp) || gluvv.volren.loadTLUT){ //good sample rate changed
copyScale(gluvv.volren.goodSamp * 1/gluvv.volren.gamma, gDeptex);
lastGoodSamp = gluvv.volren.goodSamp;
}
if((lastInteSamp != gluvv.volren.interactSamp) || gluvv.volren.loadTLUT){ //interact samp rate changed
copyScale(gluvv.volren.interactSamp * 1/gluvv.volren.gamma, iDeptex);
lastInteSamp = gluvv.volren.interactSamp;
}
if(gluvv.volren.sampleRate == gluvv.volren.goodSamp){ //which one do we load (good)
loadDepTex(gDeptex);
lastSamp = gluvv.volren.goodSamp;
}
else if(gluvv.volren.sampleRate == gluvv.volren.interactSamp){ //(interactive)
loadDepTex(iDeptex);
lastSamp = gluvv.volren.interactSamp;
}
if(gluvv.volren.loadTLUT){ //now load the transfer function
loadDepTex(gluvv.volren.deptex2, deptex2Name);
}
gluvv.volren.loadTLUT = 0;
}
} else { //just do gamma scale, don't update for the sample rate (for testing purposes)
if(gluvv.volren.loadTLUT){
copyScale(1/gluvv.volren.gamma, gDeptex);
loadDepTex(gDeptex);
loadDepTex(gluvv.volren.deptex2, deptex2Name);
gluvv.volren.loadTLUT = 0;
}
}
//-------------- end Re-Scale Alpha values ------------------------------
//-------------- do dot product with clip and view dir
float vdir[3];
subV3(vdir, gluvv.env.eye, gluvv.clip.pos);
normalizeV3(vdir);
normalizeV3(gluvv.clip.dir);
float dv = dotV3(vdir,gluvv.clip.dir);
float globalModV[16]; //save original tranform
glGetFloatv(GL_MODELVIEW_MATRIX, globalModV); //save the world model view
//-------------- end do dot product with clip and view dir
glPushMatrix();{ //move to the volume location
glTranslatef(gluvv.rinfo.trans[0], //translate
gluvv.rinfo.trans[1],
gluvv.rinfo.trans[2]);
glMultMatrixf(gluvv.rinfo.xform); //rotate
glTranslatef(-gluvv.mv->xfSize/2, //center
-gluvv.mv->yfSize/2,
-gluvv.mv->zfSize/2);
//-------------- draw clip slices --------------------------------------
for(int i=0; i<gluvv.mv->numSubVols; ++i){
drawClip(i, dv, globalModV);
}
//-------------- end draw clip slices ----------------------------------
//----------------------------------------------------------------------
//-------------- render the volume -------------------------------------
//-- first compute the axis for rendering
float axis[4] = {0,0,1,0}; //3 for view direction and one for the dot
// modify slice axis for shadowing ------
float ldir[3]; //figure out the light direction
copyV3(ldir,gluvv.light.pos); //this is the position
negateV3(ldir); //this is the direction
normalizeV3(ldir); //normalize both vectors
normalizeV3(axis); // light & axis
float vdl = dotV3(ldir,axis); //the dot product tells us to flip the axis
if(vdl<=0){ //need to negate the axis
//cerr << "back to front" << endl;
negateV3(axis);
} else {
//cerr << "front to back" << endl;
}
//now compute (v - l)/2 + l = halfway view and light
float spn[3]; //slice plane normal
subV3(spn, axis, ldir);
scaleV3(.5,spn);
float halfv[3];
addV3(halfv, spn, ldir);
copyV3(axis, halfv);
axis[3] = vdl; //this stores the value of the dot product
axis[1] = -axis[1];//why? I have no idea, there must be something wrong with my math
negateV3(axis); //the actual direction for slicing
// end modify slice axis for shadowing ------
setupShaders();
setupRegComb(vdl);
setupPBuff();
GLdouble mv[16];
glGetDoublev(GL_MODELVIEW_MATRIX, mv); //save modelview matrix
renderBricks(mv, axis); //RENDER!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
resetShaders();
resetRegComb();
//-------------- end render the volume ---------------------------------
//----------------------------------------------------------------------
#if 1
gluvv.reblend = GB_UNDER; //force gluvv.display to composite the background
#endif
//-------------- draw clip slices --------------------------------------
for(i=0; i<gluvv.mv->numSubVols; ++i){
drawClip(i, -dv, globalModV);
}
//-------------- end draw clip slices ----------------------------------
} glPopMatrix();
resetShaders();
resetRegComb();
resetClips();
if(gluvv.light.showView){
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, shadowName);
glBegin(GL_QUADS);{
glTexCoord2f(0,0);
glVertex3f(0,0,0);
glTexCoord2f(1,0);
glVertex3f(1,0,0);
glTexCoord2f(1,1);
glVertex3f(1,1,0);
glTexCoord2f(0,1);
glVertex3f(0,1,0);
} glEnd();
glDisable(GL_TEXTURE_2D);
}
}
//======================================================== Render Bricks
//======================================================================
void NV20VolRen3D2::renderBricks(GLdouble mv[16], GLfloat axis[4])
{
if(gluvv.mv->numSubVols > 1){ //render multiple bricked volumes
int *order = new int[gluvv.mv->numSubVols]; //the correct draw order
float *zval = new float[gluvv.mv->numSubVols];//zvalue of each subvolume
float ref[3];
copyV3(ref, axis);
negateV3(ref);
scaleV3(100, ref);
for(int i=0; i< gluvv.mv->numSubVols; ++i){ //compute zvalues
Volume *v = &gluvv.mv->volumes[i];
order[i] = i;
float c[3] = {v->xfPos + v->xfSize/2.0, v->yfPos + v->yfSize/2.0, v->zfPos + v->zfSize/2.0};
float center[3];
translateV3W(center, mv, c);
float sub[3];
subV3(sub, ref, center);
//zval[i] = normV3(sub);//(float)(center[0]*center[0] + center[1]*center[1] + center[2]*center[2]);
zval[i] = (float)(center[0]*center[0] + center[1]*center[1] + center[2]*center[2]);
}
for(i=0; i< gluvv.mv->numSubVols-1; ++i){ //now sort
for(int j=i+1; j<gluvv.mv->numSubVols; ++j){
if(axis[3] <=0){ //back to front
if(zval[order[i]] < zval[order[j]]){//test for swap
int tmp = order[i];
order[i] = order[j];
order[j] = tmp;
}
} else { //front to back
if(zval[order[i]] > zval[order[j]]){//test for swap
int tmp = order[i];
order[i] = order[j];
order[j] = tmp;
}
}
}
}
for(i=0 ; i< gluvv.mv->numSubVols; ++i){ //finaly render
Volume *v = &gluvv.mv->volumes[order[i]];
float sxf = v->xfSize;
float syf = v->yfSize;
float szf = v->zfSize;
float hpx = 1.0/(gluvv.mv->xiSize*2.0);
float hpy = 1.0/(gluvv.mv->yiSize*2.0);
float hpz = 1.0/(gluvv.mv->ziSize*2.0);
float vo[8][3] = {{0,0,0},{sxf,0,0},{0,syf,0},{sxf,syf,0},{0,0,szf},{sxf,0,szf},{0,syf,szf},{sxf,syf,szf}};
float tx[8][3] = {{hpx,hpy,hpz},{1-hpx,hpy,hpz},{hpx,1-hpy,hpz},{1-hpx,1-hpy,hpz},
{hpx,hpy,1-hpz},{1-hpx,hpy,1-hpz},{hpx,1-hpy,1-hpz},{1-hpx,1-hpy,1-hpz}};
glPushMatrix(); {
setupClips(order[i],vo,tx);
glTranslatef(v->xfPos, v->yfPos, v->zfPos);
render3DVA(gluvv.volren.sampleRate,mv,order[i],vo,tx,axis);
} glPopMatrix();
}
} else { //just render one volume!
float sxf = gluvv.mv->xfSize;
float syf = gluvv.mv->yfSize;
float szf = gluvv.mv->zfSize;
float vo[8][3] = {{0,0,0},{sxf,0,0},{0,syf,0},{sxf,syf,0},{0,0,szf},{sxf,0,szf},{0,syf,szf},{sxf,syf,szf}};
float tx[8][3] = {{0,0,0},{1 ,0,0},{0,1 ,0},{1 ,1 ,0},{0,0,1 },{1 ,0,1 },{0,1 ,1 },{1 ,1 ,1 }};
setupClips(0,vo,tx);
render3DVA(gluvv.volren.sampleRate,mv,0,vo,tx,axis);
}
}
//========================================================== Setup Clips
//======================================================================
void NV20VolRen3D2::setupClips(int vol, float vo[8][3], float tx[8][3])
{
Volume *v = &gluvv.mv->volumes[vol];
if(gluvv.clip.on && gluvv.clip.ortho){
float cp[3];
cp[0] = gluvv.clip.vpos[0] > v->xfPos ?
(gluvv.clip.vpos[0] < v->xfSize + v->xfPos ? gluvv.clip.vpos[0] - v->xfPos : v->xfSize) : 0;
cp[1] = gluvv.clip.vpos[1] > v->yfPos ?
(gluvv.clip.vpos[1] < v->yfSize + v->yfPos ? gluvv.clip.vpos[1] - v->yfPos : v->yfSize) : 0;
cp[2] = gluvv.clip.vpos[2] > v->zfPos ?
(gluvv.clip.vpos[2] < v->zfSize + v->zfPos ? gluvv.clip.vpos[2] - v->zfPos : v->zfSize) : 0;
switch(gluvv.clip.oaxis){
case VolRenAxisXPos:
tx[1][0] = cp[0]/v->xfSize;
tx[3][0] = cp[0]/v->xfSize;
tx[5][0] = cp[0]/v->xfSize;
tx[7][0] = cp[0]/v->xfSize;
vo[1][0] = cp[0];
vo[3][0] = cp[0];
vo[5][0] = cp[0];
vo[7][0] = cp[0];
break;
case VolRenAxisXNeg:
tx[0][0] = cp[0]/v->xfSize;
tx[2][0] = cp[0]/v->xfSize;
tx[4][0] = cp[0]/v->xfSize;
tx[6][0] = cp[0]/v->xfSize;
vo[0][0] = cp[0];
vo[2][0] = cp[0];
vo[4][0] = cp[0];
vo[6][0] = cp[0];
break;
case VolRenAxisYPos:
tx[2][1] = cp[1]/v->yfSize;
tx[3][1] = cp[1]/v->yfSize;
tx[6][1] = cp[1]/v->yfSize;
tx[7][1] = cp[1]/v->yfSize;
vo[2][1] = cp[1];
vo[3][1] = cp[1];
vo[6][1] = cp[1];
vo[7][1] = cp[1];
break;
case VolRenAxisYNeg:
tx[0][1] = cp[1]/v->yfSize;
tx[1][1] = cp[1]/v->yfSize;
tx[4][1] = cp[1]/v->yfSize;
tx[5][1] = cp[1]/v->yfSize;
vo[0][1] = cp[1];
vo[1][1] = cp[1];
vo[4][1] = cp[1];
vo[5][1] = cp[1];
break;
case VolRenAxisZPos:
tx[4][2] = cp[2]/v->zfSize;
tx[5][2] = cp[2]/v->zfSize;
tx[6][2] = cp[2]/v->zfSize;
tx[7][2] = cp[2]/v->zfSize;
vo[4][2] = cp[2];
vo[5][2] = cp[2];
vo[6][2] = cp[2];
vo[7][2] = cp[2];
break;
case VolRenAxisZNeg:
tx[0][2] = cp[2]/v->zfSize;
tx[1][2] = cp[2]/v->zfSize;
tx[2][2] = cp[2]/v->zfSize;
tx[3][2] = cp[2]/v->zfSize;
vo[0][2] = cp[2];
vo[1][2] = cp[2];
vo[2][2] = cp[2];
vo[3][2] = cp[2];
break;
}
}
}
//============================================================ drawClips
//======================================================================
void NV20VolRen3D2::drawClip(int vol, float dv, float wmv[16])
{
if((!gluvv.clip.ortho)){
switch(gluvv.dmode){
case GDM_V1:
case GDM_V1G:
case GDM_V2:
case GDM_VGH_VG:
case GDM_VGH_V:
cerr << "clipping" << endl;
glActiveTexture(GL_TEXTURE2_ARB); { //3rd & 4th axis, or clipping
glEnable(GL_TEXTURE_2D);
glDisable(GL_TEXTURE_3D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_NONE);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_CULL_FRAGMENT_NV);
}
glPushMatrix();{ //this sets the clipping plane
glLoadIdentity(); //clips are set in world space
glMultMatrixf(wmv); //origional world space coords
glTranslatef(gluvv.clip.pos[0], //location of clipping plane
gluvv.clip.pos[1],
gluvv.clip.pos[2]);
glMultMatrixf(gluvv.clip.xform); //rotation of clip plane
GLdouble zup[4] = {0, 0, -1, 0}; // always in z direction
glEnable(GL_CLIP_PLANE5); //enable the gl clip plane
glClipPlane(GL_CLIP_PLANE5, zup);
} glPopMatrix();
break;
}
}
if((!gluvv.clip.on)||(!gluvv.clip.ortho)) return;
Volume *v = &gluvv.mv->volumes[vol];
float c[4][3];
copyV3(c[0],gluvv.clip.corners[0]);
copyV3(c[1],gluvv.clip.corners[1]);
copyV3(c[2],gluvv.clip.corners[2]);
copyV3(c[3],gluvv.clip.corners[3]);
//this moves the clip plane to sub-volume space
c[0][0] = CLAMP_ARB(0,c[0][0]-v->xfPos,v->xfSize);
c[1][0] = CLAMP_ARB(0,c[1][0]-v->xfPos,v->xfSize);
c[2][0] = CLAMP_ARB(0,c[2][0]-v->xfPos,v->xfSize);
c[3][0] = CLAMP_ARB(0,c[3][0]-v->xfPos,v->xfSize);
c[0][1] = CLAMP_ARB(0,c[0][1]-v->yfPos,v->yfSize);
c[1][1] = CLAMP_ARB(0,c[1][1]-v->yfPos,v->yfSize);
c[2][1] = CLAMP_ARB(0,c[2][1]-v->yfPos,v->yfSize);
c[3][1] = CLAMP_ARB(0,c[3][1]-v->yfPos,v->yfSize);
c[0][2] = CLAMP_ARB(0,c[0][2]-v->zfPos,v->zfSize);
c[1][2] = CLAMP_ARB(0,c[1][2]-v->zfPos,v->zfSize);
c[2][2] = CLAMP_ARB(0,c[2][2]-v->zfPos,v->zfSize);
c[3][2] = CLAMP_ARB(0,c[3][2]-v->zfPos,v->zfSize);
glEnable(GL_REGISTER_COMBINERS_NV);
glCombinerParameteriNV(GL_NUM_GENERAL_COMBINERS_NV, 2);
// I am just using these to replace the texture's alpha with a different one
float alpha[4] = {1,0,0,gluvv.clip.alpha};
glCombinerParameterfvNV(GL_CONSTANT_COLOR0_NV, alpha); //set W
float greenish[4] = {0,1,0,1};
glCombinerParameterfvNV(GL_CONSTANT_COLOR1_NV, greenish); //set W
//blue is the primary color
glColor4f(0,0,1,1);
//now for some painfull swizling
//extract the red, extract the green
glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_A_NV, GL_TEXTURE0_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_B_NV, GL_CONSTANT_COLOR0_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_C_NV, GL_TEXTURE0_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_D_NV, GL_CONSTANT_COLOR1_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER0_NV, GL_RGB,
GL_SPARE0_NV, GL_SPARE1_NV, GL_DISCARD_NV, GL_NONE, GL_NONE, GL_TRUE, GL_TRUE, GL_FALSE);
GlErr("nv20volren","gcom0.4");
//alpha goes to red + green
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_A_NV, GL_TEXTURE0_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_B_NV, GL_CONSTANT_COLOR0_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_C_NV, GL_SPARE0_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_D_NV, GL_CONSTANT_COLOR1_NV, GL_UNSIGNED_INVERT_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER1_NV, GL_RGB,
GL_DISCARD_NV, GL_DISCARD_NV, GL_TEXTURE0_ARB, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE);
GlErr("nv20volren","gcom1.4");
//add blue now, set the correct alpha
glFinalCombinerInputNV(GL_VARIABLE_A_NV, GL_SPARE1_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
GlErr("nv20volren","fcom1");
glFinalCombinerInputNV(GL_VARIABLE_B_NV, GL_PRIMARY_COLOR_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
GlErr("nv20volren","fcom2");
glFinalCombinerInputNV(GL_VARIABLE_C_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
GlErr("nv20volren","fcom3");
glFinalCombinerInputNV(GL_VARIABLE_D_NV, GL_TEXTURE0_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
GlErr("nv20volren","fcom0");
glFinalCombinerInputNV(GL_VARIABLE_G_NV, GL_CONSTANT_COLOR0_NV, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glEnable(GL_BLEND);
float offset = .001; //this is used to avoid z-compete when the slice is on top
glPushMatrix();{
//make sure we draw this in sub-volume space
glTranslatef(v->xfPos, v->yfPos, v->zfPos);
switch(gluvv.clip.oaxis){
case VolRenAxisXPos:
if((dv < 0)&&(c[0][0] > 0)&&(c[0][0]<v->xfSize)){
float ov[3] = {offset, 0, 0}; //offset vector
for(int i=0; i<4; ++ i)
addV3(c[i],c[i],ov);
renderSlice(c,vol);
}
break;
case VolRenAxisXNeg:
if(dv > 0){
float ov[3] = {-offset, 0, 0}; //offset vector
for(int i=0; i<4; ++ i)
addV3(c[i],c[i],ov);
renderSlice(c,vol);
}
break;
case VolRenAxisYPos:
if((dv > 0)&&(c[0][1] > 0)&&(c[0][1]<v->yfSize)){
float ov[3] = {0, offset, 0}; //offset vector
for(int i=0; i<4; ++ i)
addV3(c[i],c[i],ov);
renderSlice(c,vol);
}
break;
case VolRenAxisYNeg:
if((dv < 0)&&(c[0][1] > 0)&&(c[0][1]<v->yfSize)){
float ov[3] = {0, -offset, 0}; //offset vector
for(int i=0; i<4; ++ i)
addV3(c[i],c[i],ov);
renderSlice(c,vol);
}
break;
case VolRenAxisZPos:
if((dv < 0)&&(c[0][2] > 0)&&(c[0][2]<v->zfSize)){
float ov[3] = {0, 0, offset}; //offset vector
for(int i=0; i<4; ++ i)
addV3(c[i],c[i],ov);
renderSlice(c,vol);
}
break;
case VolRenAxisZNeg:
if((dv > 0)&&(c[0][2] > 0)&&(c[0][2]<v->zfSize)){
float ov[3] = {0, 0, -offset}; //offset vector
for(int i=0; i<4; ++ i)
addV3(c[i],c[i],ov);
renderSlice(c,vol);
}
break;
}
} glPopMatrix();
glDisable(GL_REGISTER_COMBINERS_NV); //clean up opengl state
glActiveTexture(GL_TEXTURE0_ARB); {
glDisable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_NONE);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_TEXTURE_2D);
}
glDisable(GL_BLEND);
}
//============================================== Render Slice w/ corners
//======================================================================
void NV20VolRen3D2::renderSlice(float c[4][3], int vol)
{
glActiveTexture(GL_TEXTURE0_ARB); { //this is for the slice
glEnable(GL_TEXTURE_3D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_TEXTURE_3D);
glBindTexture(GL_TEXTURE_3D, texNames[vol]);
}
Volume *v = &gluvv.mv->volumes[vol];
glBegin(GL_QUADS);{
glMultiTexCoord3fARB(GL_TEXTURE0_ARB,c[0][0]/(v->xfSize),c[0][1]/(v->yfSize),c[0][2]/(v->zfSize));
glVertex3f(c[0][0], c[0][1], c[0][2]);
glMultiTexCoord3fARB(GL_TEXTURE0_ARB,c[1][0]/(v->xfSize),c[1][1]/(v->yfSize),c[1][2]/(v->zfSize));
glVertex3f(c[1][0], c[1][1], c[1][2]);
glMultiTexCoord3fARB(GL_TEXTURE0_ARB,c[2][0]/(v->xfSize),c[2][1]/(v->yfSize),c[2][2]/(v->zfSize));
glVertex3f(c[2][0], c[2][1], c[2][2]);
glMultiTexCoord3fARB(GL_TEXTURE0_ARB,c[3][0]/(v->xfSize),c[3][1]/(v->yfSize),c[3][2]/(v->zfSize));
glVertex3f(c[3][0], c[3][1], c[3][2]);
} glEnd();
}
//=========================================================== resetClips
//======================================================================
void NV20VolRen3D2::resetClips()
{
glDisable(GL_CLIP_PLANE0);
}
//======================================================== Setup Shaders
//======================================================================
void NV20VolRen3D2::setupShaders()
{
glEnable(GL_TEXTURE_SHADER_NV); {
GlErr("nv20volren", "enable shader");
glActiveTexture(GL_TEXTURE0_ARB); { //this is for the slice
glEnable(GL_TEXTURE_3D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_NONE);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_TEXTURE_3D);
}
glActiveTexture(GL_TEXTURE1_ARB); { //this is for the transfer function
glEnable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_DEPENDENT_AR_TEXTURE_2D_NV);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_2D, deptexName);
}
glActiveTexture(GL_TEXTURE2_ARB); { // for shading or clipping (not both)
if((gluvv.shade == gluvvShadeDiff) || (gluvv.shade == gluvvShadeDSpec)){
//shading
glEnable(GL_TEXTURE_3D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_TEXTURE_3D);
//glBindTexture(GL_TEXTURE_3D, shadeNames[0]);
} else if(gluvv.light.shadow){ //shadows w/no shading
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, shadowName);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_TEXTURE_2D);
} else {
//no shading
glDisable(GL_TEXTURE_2D);
glDisable(GL_TEXTURE_3D);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_NONE);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_NONE);
}
}
glActiveTexture(GL_TEXTURE3_ARB); { //3rd & 4th axis, or clipping, or shadows
if((gluvv.shade == gluvvShadeDiff) || (gluvv.shade == gluvvShadeDSpec)){ //we have to use this for shadows
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, shadowName);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_TEXTURE_2D);
} else { //use this for 3rd axis
switch(gluvv.dmode){ //hey! we use this for 3rd & 4th axies
case GDM_VGH:
case GDM_V1GH:
case GDM_V2G:
case GDM_V2GH:
case GDM_V3:
case GDM_V3G:
case GDM_V4:
glEnable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_DEPENDENT_GB_TEXTURE_2D_NV);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_2D, deptex2Name);
break;
case GDM_V1:
case GDM_V1G:
case GDM_V2:
case GDM_VGH_VG:
case GDM_VGH_V:
if(!gluvv.clip.ortho) break; //we want to take care of this elsewhere
default:
glDisable(GL_TEXTURE_2D);
glDisable(GL_TEXTURE_3D);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_NONE);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_NONE);
}
}
}
GlErr("set up shader", "after texture3");
}
}
void NV20VolRen3D2::resetShaders()
{
glActiveTexture(GL_TEXTURE3_ARB); { //not used
glDisable(GL_TEXTURE_2D);
glDisable(GL_TEXTURE_3D);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_NONE);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_NONE);
}
glActiveTexture(GL_TEXTURE2_ARB); { //not used
glDisable(GL_TEXTURE_2D);
glDisable(GL_TEXTURE_3D);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_NONE);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_NONE);
}
glActiveTexture(GL_TEXTURE1_ARB); { //not used
glDisable(GL_TEXTURE_2D);
glDisable(GL_TEXTURE_3D);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_NONE);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_NONE);
}
glActiveTexture(GL_TEXTURE0_ARB); { //not used
glDisable(GL_TEXTURE_2D);
glDisable(GL_TEXTURE_3D);
glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_NONE);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
}
glDisable(GL_TEXTURE_SHADER_NV);
}
//======================================================= Setup Reg Comb
//======================================================================
void NV20VolRen3D2::setupRegComb(float ftb)
{
if((gluvv.shade == gluvvShadeDiff) || (gluvv.shade == gluvvShadeDSpec)){
float vdir[3];
subV3(vdir, gluvv.env.eye, gluvv.env.at);
normalizeV3(vdir);
float ltdir[3];
subV3(ltdir, gluvv.light.pos, gluvv.env.at);
normalizeV3(ltdir);
float ltoe[3];
subV3(ltoe,vdir,ltdir);
scaleV3(.5, ltoe);
float half[4];
addV3(half,ltdir, ltoe);
half[3] = 1;
float vhalf[4];
float invx[16];
inverseMatrix(invx, gluvv.rinfo.xform);
translateV3(vhalf,invx,half);
negateV3(vhalf);
normalizeV3(vhalf);
vhalf[0] = vhalf[0]/2 + .5;
vhalf[1] = vhalf[1]/2 + .5;
vhalf[2] = vhalf[2]/2 + .5;
glFogfv(GL_FOG_COLOR, vhalf);
float lpos[4];
translateV3W(lpos, invx, ltdir);
negateV3(lpos);
normalizeV3(ltdir);
lpos[0] = lpos[0]/2 + .5;
lpos[1] = lpos[1]/2 + .5;
lpos[2] = lpos[2]/2 + .5;
lpos[3] = 1.0 - gluvv.light.amb;
glCombinerParameterfvNV(GL_CONSTANT_COLOR1_NV, lpos); //set light direction
glEnable(GL_REGISTER_COMBINERS_NV);
glCombinerParameteriNV(GL_NUM_GENERAL_COMBINERS_NV, 8);
//diffuse dot product (2 sided)
glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_A_NV, GL_TEXTURE2_ARB, GL_EXPAND_NORMAL_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_B_NV, GL_CONSTANT_COLOR1_NV, GL_EXPAND_NORMAL_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_C_NV, GL_TEXTURE2_ARB, GL_EXPAND_NORMAL_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_D_NV, GL_CONSTANT_COLOR1_NV, GL_EXPAND_NEGATE_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER0_NV, GL_RGB,
GL_SPARE0_NV, GL_SPARE1_NV, GL_DISCARD_NV, GL_NONE, GL_NONE, GL_TRUE, GL_TRUE, GL_FALSE);
GlErr("nv20volren","gcom0.4");
//compute diffuse contribution (sum of diff-dot times color)
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_A_NV, GL_SPARE1_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_B_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_C_NV, GL_SPARE0_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_D_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER1_NV, GL_RGB,
GL_DISCARD_NV, GL_DISCARD_NV, GL_SPARE0_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE);
GlErr("nv20volren","gcom1.4");
//add diffuse and ambient (add in ambient and square the diffuse)
glCombinerInputNV(GL_COMBINER2_NV, GL_RGB, GL_VARIABLE_A_NV, GL_SPARE0_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER2_NV, GL_RGB, GL_VARIABLE_B_NV, GL_SPARE0_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER2_NV, GL_RGB, GL_VARIABLE_C_NV, GL_CONSTANT_COLOR1_NV, GL_UNSIGNED_INVERT_NV, GL_ALPHA);
glCombinerInputNV(GL_COMBINER2_NV, GL_RGB, GL_VARIABLE_D_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER2_NV, GL_RGB,
GL_DISCARD_NV, GL_DISCARD_NV, GL_TEXTURE1_ARB, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE);
GlErr("nv20volren","gcom2.4");
//specular dod product (2 sided)
glCombinerInputNV(GL_COMBINER3_NV, GL_RGB, GL_VARIABLE_A_NV, GL_TEXTURE2_ARB, GL_EXPAND_NORMAL_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER3_NV, GL_RGB, GL_VARIABLE_B_NV, GL_FOG, GL_EXPAND_NORMAL_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER3_NV, GL_RGB, GL_VARIABLE_C_NV, GL_TEXTURE2_ARB, GL_EXPAND_NEGATE_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER3_NV, GL_RGB, GL_VARIABLE_D_NV, GL_FOG, GL_EXPAND_NORMAL_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER3_NV, GL_RGB,
GL_SPARE1_NV, GL_TEXTURE2_ARB, GL_DISCARD_NV, GL_NONE, GL_NONE, GL_TRUE, GL_TRUE, GL_FALSE);
GlErr("nv20volren","gcom3.4");
//specular 2nd power & sum to one value
glCombinerInputNV(GL_COMBINER4_NV, GL_RGB, GL_VARIABLE_A_NV, GL_SPARE1_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER4_NV, GL_RGB, GL_VARIABLE_B_NV, GL_SPARE1_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER4_NV, GL_RGB, GL_VARIABLE_C_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER4_NV, GL_RGB, GL_VARIABLE_D_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER4_NV, GL_RGB,
GL_TEXTURE2_ARB, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE);
GlErr("nv20volren","gcom4.4");
//shadow weight, specular 4th power
glCombinerInputNV(GL_COMBINER5_NV, GL_RGB, GL_VARIABLE_A_NV, GL_TEXTURE3_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glCombinerInputNV(GL_COMBINER5_NV, GL_RGB, GL_VARIABLE_B_NV, GL_CONSTANT_COLOR1_NV, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glCombinerInputNV(GL_COMBINER5_NV, GL_RGB, GL_VARIABLE_C_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER5_NV, GL_RGB, GL_VARIABLE_D_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER5_NV, GL_RGB,
GL_TEXTURE3_ARB, GL_TEXTURE2_ARB, GL_DISCARD_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE);
GlErr("nv20volren","gcom5.4");
//shadow diffuse & specular 8th power
glCombinerInputNV(GL_COMBINER6_NV, GL_RGB, GL_VARIABLE_A_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
if(gluvv.light.shadow)
glCombinerInputNV(GL_COMBINER6_NV, GL_RGB, GL_VARIABLE_B_NV, GL_TEXTURE3_ARB, GL_UNSIGNED_INVERT_NV, GL_ALPHA);
else
glCombinerInputNV(GL_COMBINER6_NV, GL_RGB, GL_VARIABLE_B_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_ALPHA);
glCombinerInputNV(GL_COMBINER6_NV, GL_RGB, GL_VARIABLE_C_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER6_NV, GL_RGB, GL_VARIABLE_D_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER6_NV, GL_RGB,
GL_TEXTURE1_ARB, GL_TEXTURE2_ARB, GL_DISCARD_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE);
GlErr("nv20volren","gcom6.4");
//specular shadow add to diffuse
glCombinerInputNV(GL_COMBINER7_NV, GL_RGB, GL_VARIABLE_A_NV, GL_SPARE1_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
if(gluvv.light.shadow)
glCombinerInputNV(GL_COMBINER7_NV, GL_RGB, GL_VARIABLE_B_NV, GL_TEXTURE3_ARB, GL_UNSIGNED_INVERT_NV, GL_ALPHA);
else
glCombinerInputNV(GL_COMBINER7_NV, GL_RGB, GL_VARIABLE_B_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER7_NV, GL_RGB, GL_VARIABLE_C_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER7_NV, GL_RGB, GL_VARIABLE_D_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER7_NV, GL_RGB,
GL_DISCARD_NV, GL_TEXTURE2_ARB, GL_TEXTURE1_ARB, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE);
GlErr("nv20volren","gcom7.4");
//final combiner
glFinalCombinerInputNV(GL_VARIABLE_A_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
if(ftb <= 0)
glFinalCombinerInputNV(GL_VARIABLE_B_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
else
glFinalCombinerInputNV(GL_VARIABLE_B_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glFinalCombinerInputNV(GL_VARIABLE_C_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
//glFinalCombinerInputNV(GL_VARIABLE_D_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_D_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_E_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_F_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_G_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
GlErr("nv20volren","fcom.0");
}
else{ //no shading =================================================
float amb[4] = {1,1,1,1.0 - gluvv.light.amb}; //ambiant shadow factor
switch(gluvv.dmode){ //third axis stuff
case GDM_VGH:
case GDM_V1GH:
case GDM_V2G:
case GDM_V2GH:
case GDM_V3:
case GDM_V3G:
case GDM_V4:
glEnable(GL_REGISTER_COMBINERS_NV);
glCombinerParameterfvNV(GL_CONSTANT_COLOR1_NV, amb); //set ambiant contribution
glCombinerParameteriNV(GL_NUM_GENERAL_COMBINERS_NV, 2);
glCombinerInputNV(GL_COMBINER0_NV, GL_ALPHA, GL_VARIABLE_A_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glCombinerInputNV(GL_COMBINER0_NV, GL_ALPHA, GL_VARIABLE_B_NV, GL_TEXTURE3_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glCombinerInputNV(GL_COMBINER0_NV, GL_ALPHA, GL_VARIABLE_C_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glCombinerInputNV(GL_COMBINER0_NV, GL_ALPHA, GL_VARIABLE_D_NV, GL_CONSTANT_COLOR1_NV, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glCombinerOutputNV(GL_COMBINER0_NV, GL_ALPHA,
GL_TEXTURE1_ARB, GL_TEXTURE2_ARB, GL_DISCARD_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE);
GlErr("nv20volren","gcom7.4");
if(gluvv.light.shadow){
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_A_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_B_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_INVERT_NV, GL_ALPHA);
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_C_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_D_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER1_NV, GL_RGB,
GL_TEXTURE1_ARB, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE);
GlErr("nv20volren","gcom7.4");
} else {
glCombinerOutputNV(GL_COMBINER1_NV, GL_RGB,
GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE);
}
glFinalCombinerInputNV(GL_VARIABLE_A_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
//glFinalCombinerInputNV(GL_VARIABLE_A_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
if(ftb <= 0)
glFinalCombinerInputNV(GL_VARIABLE_B_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
else
glFinalCombinerInputNV(GL_VARIABLE_B_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glFinalCombinerInputNV(GL_VARIABLE_C_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_D_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_E_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_F_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_G_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
GlErr("nv20volren","fcom.0");
break;
default:
glEnable(GL_REGISTER_COMBINERS_NV);
glCombinerParameterfvNV(GL_CONSTANT_COLOR1_NV, amb); //set ambiant contribution
glCombinerParameteriNV(GL_NUM_GENERAL_COMBINERS_NV, 2);
glCombinerInputNV(GL_COMBINER0_NV, GL_ALPHA, GL_VARIABLE_A_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glCombinerInputNV(GL_COMBINER0_NV, GL_ALPHA, GL_VARIABLE_B_NV, GL_CONSTANT_COLOR1_NV, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glCombinerInputNV(GL_COMBINER0_NV, GL_ALPHA, GL_VARIABLE_C_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glCombinerInputNV(GL_COMBINER0_NV, GL_ALPHA, GL_VARIABLE_D_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glCombinerOutputNV(GL_COMBINER0_NV, GL_ALPHA,
GL_TEXTURE2_ARB, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE);
GlErr("nv20volren","gcom7.4");
if(gluvv.light.shadow){
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_A_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_B_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_INVERT_NV, GL_ALPHA);
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_C_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_D_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER1_NV, GL_RGB,
GL_TEXTURE1_ARB, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE);
GlErr("nv20volren","gcom7.4");
} else {
glCombinerOutputNV(GL_COMBINER1_NV, GL_RGB,
GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE);
}
glFinalCombinerInputNV(GL_VARIABLE_A_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
if(ftb <= 0)
glFinalCombinerInputNV(GL_VARIABLE_B_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
else
glFinalCombinerInputNV(GL_VARIABLE_B_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
glFinalCombinerInputNV(GL_VARIABLE_C_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_D_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_E_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_F_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_G_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA);
GlErr("nv20volren","fcom.0");
break;
}
}
}
void NV20VolRen3D2::resetRegComb()
{
glDisable(GL_REGISTER_COMBINERS_NV);
}
//====================================================== Set Up P-Buffer
//======================================================================
void NV20VolRen3D2::setupPBuff() //prepare pbuffer for rendering
{
if(gluvv.picking) return;
pbuff->MakeCurrent();
GlErr("volren", "setupPbub()-start");
//compute the view-port for this projection
float winsz[3] = {.8, .8, .5};
float winszp[3];
translateV3WD(winszp, gluvv.light.pj,winsz);
xbias = winszp[0];
ybias = winszp[1];
xscale = gluvv.light.buffsz[0]/(winszp[0]*2);
yscale = gluvv.light.buffsz[1]/(winszp[1]*2);
#if 0
glMatrixMode( GL_PROJECTION );{ //figure out the window size
glLoadIdentity();
glOrtho(0,gluvv.light.buffsz[0],0,gluvv.light.buffsz[1],1,3);
}
glMatrixMode(GL_MODELVIEW);{
glLoadIdentity();
gluLookAt(0,0,2,
0,0,0,
0,1,0);
}
#endif
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glDisable(GL_LIGHTING);
glDisable(GL_DEPTH_TEST);
glClear(GL_COLOR_BUFFER_BIT);
//setup shader stage
glEnable(GL_TEXTURE_SHADER_NV); {
GlErr("nv20volren", "enable shader");
glActiveTexture(GL_TEXTURE0_ARB); { //this is for the slice