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R8kVolRen3D.cpp
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// ________ ____ ___
// | \ / | / /
// +---+ \/ |/ /
// +--+| |\ /| <
// | || | \ / | |\ \
// | | \/ | | \ \
// \_____| |__| \__\
// Copyright 2001
// Joe Michael Kniss
// << jmk@cs.utah.edu >>
// "All Your Base are Belong to Us"
//-------------------------------------------------------------------------
// R8kVolRen3D.cpp: implementation of the R8kVolRen3D class.
// -Advanced scattering renderer
//////////////////////////////////////////////////////////////////////
#ifdef WIN32
#include <windows.h>
#endif
#include "R8kVolRen3D.h"
#include <iostream.h>
#include <stdlib.h>
#include "VectorMath.h"
#include "glUE.h"
#include "VolRenAux.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
R8kVolRen3D::R8kVolRen3D()
{
pbuff = 0;
pbuff2 = 0;
go = 0;
fsNames = 0;
pbfsNames = 0;
pb2fsNames = 0;
pb3fsNames = 0;
currentTStep = gluvv.volren.timestep;
}
R8kVolRen3D::~R8kVolRen3D()
{
}
//================================================================= INIT
//======================================================================
void R8kVolRen3D::init()
{
srand(328973892);
cerr << "initing" << endl;
if(gluvv.mv)
{
go = 1;
createVolumes(1);
create2DDepTex();
createShadowTex();
createFragShades(fsNames);
createFragClip();
createCubeTex();
glFinish();
//---------------- create 2 pbuffer for forward scattering -------------
//-------- second pbuffer
if(!(pbuff2 = new PBuffer(gluvv.light.buffsz[0], gluvv.light.buffsz[1],
GLUT_SINGLE | GLUT_RGBA)))
{
cerr << "ERROR: PBuffer2 intialization failed!" << endl;
}
else
{
pbuff2->Initialize(true, true); //create a shared pbuffer
pbuff2->MakeCurrent(); {
glClearColor( 0.0, 0.0, 0.0, 0.0 );
glMatrixMode( GL_PROJECTION );
glOrtho(0,1,0,1,-1,3);
glMatrixMode(GL_MODELVIEW);
gluLookAt(0,0,2,
0,0,0,
0,1,0);
createFragShadow(pb2fsNames);
} MakeCurrent();
cerr << "PBuffer2 intialization succeded" << endl;
}
//----------------end create 2 pbuffer for forward scattering -------------
//----------- first pbuffer
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, true); //create a shared pbuffer
pbuff->MakeCurrent(); {
glClearColor( 0.0, 0.0, 0.0, 0.0 );
glMatrixMode( GL_PROJECTION );
glOrtho(0,1,0,1,-1,3);
glMatrixMode(GL_MODELVIEW);
gluLookAt(0,0,2,
0,0,0,
0,1,0);
createFragShadow(pbfsNames);
} MakeCurrent();
cerr << "PBuffer intialization succeded" << endl;
}
//----------------create a pbuffer for backward scattering-----------------
if(!(sliceBuff = new PBuffer(gluvv.light.buffsz[0], gluvv.light.buffsz[1],
GLUT_SINGLE | GLUT_RGBA)))
{
cerr << "ERROR: slice PBuffer intialization failed!" << endl;
}
else
{
sliceBuff->Initialize(true, true); //create a shared pbuffer
sliceBuff->MakeCurrent(); {
glClearColor( 0.0, 0.0, 0.0, 0.0 );
glMatrixMode( GL_PROJECTION );
glOrtho(0,1,0,1,-1,3);
glMatrixMode(GL_MODELVIEW);
gluLookAt(0,0,2,
0,0,0,
0,1,0);
createFragShadow(pb3fsNames);
} MakeCurrent();
cerr << "slice PBuffer intialization succeded" << endl;
}
}//end if gluvv.mv
}
//================================================================= DRAW
//======================================================================
void R8kVolRen3D::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 R8kVolRen3D::renderVolume()
{
if(gluvv.reblend) return;
if(gluvv.picking)
{
return;
}
if(gluvv.volren.timestep != currentTStep)
{
cerr << "Loading new volume : " << gluvv.volren.timestep << endl;
currentTStep = gluvv.volren.timestep;
createVolumes();
}
//-------------- load new shading cube map -----------------------------
if(gluvv.light.load||gluvv.light.gload)
{
loadCubeTex(gluvv.light.gload);
gluvv.light.load = 0;
gluvv.light.gload = 0;
}
//-------------- end load new shading cube map -------------------------
//-------------- 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(gDeptex, gluvv.volren.goodSamp * 1/gluvv.volren.gamma, deptex);
lastGoodSamp = gluvv.volren.goodSamp;
}
if((lastInteSamp != gluvv.volren.interactSamp) || gluvv.volren.loadTLUT)
{ //interact samp rate changed
copyScale(iDeptex, gluvv.volren.interactSamp * 1/gluvv.volren.gamma, deptex);
lastInteSamp = gluvv.volren.interactSamp;
}
//seems as though we should just have both loaded
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;
}
//we MUST reload if the transfer function changed
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(gDeptex, 1/gluvv.volren.gamma, deptex);
loadDepTex(gDeptex);
loadDepTex(gluvv.volren.deptex2, deptex2Name);
gluvv.volren.loadTLUT = 0;
}
}
//-------------- end Re-Scale Alpha values ------------------------------
//-------------- Recompute normals --------------------------------------
if(gluvv.volren.usePostCNorm)
{
if(gluvv.volren.loadNorms)
{
unsigned char *gradout = new unsigned char[
gluvv.mv->xiSize*gluvv.mv->yiSize*gluvv.mv->ziSize *3];
VRA_PostCNorms(gradout);
if(gluvv.mv->numSubVols == 1)
{
loadTex3B(gradout, shadeNames[0],
gluvv.mv->xiSize, gluvv.mv->yiSize, gluvv.mv->ziSize);
}
else
{
cerr << "Bricked recompute not implemented yet" << endl;
}
gluvv.volren.loadNorms = 0;
}
}
//-------------- end Recompute normals ----------------------------------
//-------------- 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);
//-- first compute the axis for rendering
float axis[4] = {0,0,1,-1}; //axis[0-2] for view direction and [3] for the dot
// modify slice axis for shadowing -------------------------------------
if(gluvv.light.shadow)
{
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
//its a left handed coordiante system duh
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 --------------------------------
GLdouble mv[16];
glGetDoublev(GL_MODELVIEW_MATRIX, mv); //save modelview matrix
// --------------------- set up shading transform ---------------------
float *r = gluvv.rinfo.xform;
float cons0[4] = {r[0]/2+.5, r[4]/2+.5, r[8]/2+.5, gluvv.clip.alpha};
float cons1[4] = {r[1]/2+.5, r[5]/2+.5, r[9]/2+.5, 0};
float cons2[4] = {r[2]/2+.5, r[6]/2+.5, r[10]/2+.5, 0};
glSetFragmentShaderConstantATI(GL_CON_0_ATI, cons0);
glSetFragmentShaderConstantATI(GL_CON_1_ATI, cons1);
glSetFragmentShaderConstantATI(GL_CON_2_ATI, cons2);
// --------------------- end set up shading transform -----------------
// --------------------- set up attinuation parameters ----------------
GLfloat tmpmv[16];
getModelView(tmpmv);
GLfloat invmv[16];
inverseMatrix(invmv, tmpmv);
translateV3W(volview, invmv, gluvv.env.eye);
translateV3W(vollt, invmv, gluvv.light.pos);
ltrange[0] = normV3(gluvv.light.pos) - gluvv.light.lattLimits[0];
ltrange[1] = normV3(gluvv.light.pos) - gluvv.light.lattLimits[1];
fogrange[0] = normV3(gluvv.env.eye) - gluvv.light.fogLimits[0];
fogrange[1] = normV3(gluvv.env.eye) - gluvv.light.fogLimits[1];
float cons3[4] = {gluvv.light.fogColor[0],
gluvv.light.fogColor[1],
gluvv.light.fogColor[2],
gluvv.light.amb};
glSetFragmentShaderConstantATI(GL_CON_3_ATI, cons3);
// --------------------- end set up attinuation parameters ------------
//-------------- draw clip slices --------------------------------------
if(axis[3] <= 0)
{ //only do this if front to back
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glDepthMask(GL_FALSE);
for(int i=0; i<gluvv.mv->numSubVols; ++i)
{
drawClip(i, dv, globalModV);
}
glDisable(GL_BLEND);
glDepthMask(GL_TRUE);
}
//-------------- end draw clip slices ----------------------------------
//---------------------- set up shading environment -------------------
setupTexUs();
setupFragShade(axis[3]);
if(gluvv.light.shadow)
setupPBuff();
glDepthMask(GL_FALSE); //no depth wright, only depth test
//---------------------- end set up shading environment ---------------
#if 1
gluvv.reblend = GB_UNDER; //force gluvv.display to composite the background
#endif
//----------------------------------------------------------------------
//-------------- render the volume -------------------------------------
renderBricks(mv, axis); //RENDER!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//-------------- end render the volume ---------------------------------
//----------------------------------------------------------------------
//----------------------- clean up shading environment ----------------
glDepthMask(GL_TRUE);
glDisable(GL_BLEND);
if(gluvv.light.shadow)
resetPBuff();
resetTexUs();
resetFragShade();
//----------------------- end clean up shading environment -------------
//-------------- draw clip slices --------------------------------------
if(axis[3] <= 0)
{
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glDepthMask(GL_FALSE);
for(int i=0; i<gluvv.mv->numSubVols; ++i)
{
drawClip(i, -dv, globalModV);
}
glDisable(GL_BLEND);
glDepthMask(GL_TRUE);
}
else
{
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glDepthMask(GL_FALSE);
for(int i=0; i<gluvv.mv->numSubVols; ++i)
{
drawClip(i, -dv, globalModV);
}
glDisable(GL_BLEND);
glDepthMask(GL_TRUE);
}
//-------------- end draw clip slices ----------------------------------
} glPopMatrix();
resetFragShade();
resetTexUs();
resetClips();
//------------- render last thing copied from pbuffer --------------------
if(gluvv.light.showView)
{
glPushMatrix();
{
glTranslatef(gluvv.rinfo.trans[0], gluvv.rinfo.trans[1], gluvv.rinfo.trans[2]);
//first the forward light buffer
glActiveTexture(GL_TEXTURE1_ARB);
{
glDisable(GL_TEXTURE_3D);
glEnable(GL_TEXTURE_2D);
wglBindTexImageARB(pbuff->buffer, WGL_FRONT_LEFT_ARB);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
}
glBegin(GL_QUADS);
{
glMultiTexCoord2fARB(GL_TEXTURE1_ARB,0,0);
glVertex3f(-1, -1, 0);
glMultiTexCoord2fARB(GL_TEXTURE1_ARB,0,1);
glVertex3f(-1, 0, 0);
glMultiTexCoord2fARB(GL_TEXTURE1_ARB,1,1);
glVertex3f(0, 0, 0);
glMultiTexCoord2fARB(GL_TEXTURE1_ARB,1,0);
glVertex3f(0, -1, 0);
} glEnd();
glActiveTexture(GL_TEXTURE1_ARB);
{
wglReleaseTexImageARB(pbuff->buffer, WGL_FRONT_LEFT_ARB);
glDisable(GL_TEXTURE_2D);
}
//the other forward buffer
glActiveTexture(GL_TEXTURE1_ARB);
{
glDisable(GL_TEXTURE_CUBE_MAP_ARB);
glDisable(GL_TEXTURE_3D);
glDisable(GL_TEXTURE_2D);
glEnable(GL_TEXTURE_2D);
wglBindTexImageARB(pbuff2->buffer, WGL_FRONT_LEFT_ARB);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
}
glBegin(GL_QUADS);
{
glMultiTexCoord2fARB(GL_TEXTURE1_ARB,1,0);
glVertex3f(1, -1, 0);
glMultiTexCoord2fARB(GL_TEXTURE1_ARB,1,1);
glVertex3f(1, 0, 0);
glMultiTexCoord2fARB(GL_TEXTURE1_ARB,0,1);
glVertex3f(0, 0, 0);
glMultiTexCoord2fARB(GL_TEXTURE1_ARB,0,0);
glVertex3f(0, -1, 0);
} glEnd();
glActiveTexture(GL_TEXTURE1_ARB);
{
wglReleaseTexImageARB(pbuff2->buffer, WGL_FRONT_LEFT_ARB);
glDisable(GL_TEXTURE_2D);
}
#if 0
//next the backward light buffer
glActiveTexture(GL_TEXTURE1_ARB);
{
glDisable(GL_TEXTURE_3D);
glEnable(GL_TEXTURE_2D);
wglBindTexImageARB(sliceBuff->buffer, WGL_FRONT_LEFT_ARB);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
}
glBegin(GL_QUADS);
{
glMultiTexCoord2fARB(GL_TEXTURE1_ARB,0,0);
glVertex3f(1, 1, 0);
glMultiTexCoord2fARB(GL_TEXTURE1_ARB,0,1);
glVertex3f(1, 0, 0);
glMultiTexCoord2fARB(GL_TEXTURE1_ARB,1,1);
glVertex3f(0, 0, 0);
glMultiTexCoord2fARB(GL_TEXTURE1_ARB,1,0);
glVertex3f(0, 1, 0);
} glEnd();
glActiveTexture(GL_TEXTURE1_ARB);{
wglReleaseTexImageARB(sliceBuff->buffer, WGL_FRONT_LEFT_ARB);
glDisable(GL_TEXTURE_2D);
}
#endif
} glPopMatrix();
glActiveTexture(GL_TEXTURE0_ARB);
}
//------------- end render last thing copied from pbuffer ----------------
glEnable(GL_LIGHTING);
GlErr("r8kvolren::draw", "end");
}
//======================================================= Get Model View
//======================================================================
void R8kVolRen3D::getModelView(float mv[16])
{
float m1[16];
identityMatrix(m1);
m1[12] = gluvv.rinfo.trans[0];
m1[13] = gluvv.rinfo.trans[1];
m1[14] = gluvv.rinfo.trans[2];
float m2[16];
matrixMult(m2, m1, gluvv.rinfo.xform);
float scale[16];
identityMatrix(scale);
scale[0] = gluvv.rinfo.scale;
scale[5] = gluvv.rinfo.scale;
scale[10]= gluvv.rinfo.scale;
float m3[16];
matrixMult(m3, m2, scale);
float m4[16];
identityMatrix(m4);
m4[12] = -.5 * gluvv.mv->xfSize;
m4[13] = -.5 * gluvv.mv->yfSize;
m4[14] = -.5 * gluvv.mv->zfSize;
matrixMult(mv, m3, m4);
}
//======================================================== Render Bricks
//======================================================================
void R8kVolRen3D::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);
//--------------- compute zvalues ----------------------
for(int i=0; i< gluvv.mv->numSubVols; ++i) //for each sub volume
{
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]);
}
//--------------- end compute zvalues -------------------
//--------------- sort Z values -------------------------
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 rendering sort
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 rendering sort
if(zval[order[i]] > zval[order[j]])
{ //test for swap
int tmp = order[i];
order[i] = order[j];
order[j] = tmp;
}
}
}
}
//--------------- end sort Z values ----------------------
//--------------- render bricks --------------------------
for(i=0 ; i< gluvv.mv->numSubVols; ++i)
{ //finaly render each sub volume
cerr << "rendering brick " << order[i] << endl;
Volume *v = &gluvv.mv->volumes[order[i]];
float sxf = v->xfSize;
float syf = v->yfSize;
float szf = v->zfSize;
float hpx = 0;//1.0/(gluvv.mv->xiSize*2.0);
float hpy = 0;//1.0/(gluvv.mv->yiSize*2.0);
float hpz = 0;//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] = {{0,0,0},{1,0,0},{0,1,0},{1,1,0},
{0,0,1},{1,0,1},{0,1,1},{1,1,1}};
glPushMatrix();
{
setupClips(order[i],vo,tx);
glTranslatef(v->xfPos, v->yfPos, v->zfPos);
render3DVA(gluvv.volren.sampleRate,mv,order[i],vo,tx,axis);
} glPopMatrix();
//glFinish();
}
//--------------- end render bricks ----------------------
}
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 R8kVolRen3D::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 R8kVolRen3D::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);
}
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);
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();
}
//============================================== Render Slice w/ corners
//======================================================================
void R8kVolRen3D::renderSlice(float c[4][3], int vol)
{ //this just renders a single slice from the volume
glActiveTexture(GL_TEXTURE0_ARB);
{
glEnable(GL_TEXTURE_3D);
glBindTexture(GL_TEXTURE_3D, texNames[vol]);
}
Volume *v = &gluvv.mv->volumes[vol];
glEnable(GL_FRAGMENT_SHADER_ATI);
glBindFragmentShaderATI(cpfsName);
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();
glDisable(GL_FRAGMENT_SHADER_ATI);
glActiveTexture(GL_TEXTURE0_ARB);
{
glDisable(GL_TEXTURE_3D);
}
}
//=========================================================== resetClips
//======================================================================
void R8kVolRen3D::resetClips()
{
glDisable(GL_CLIP_PLANE0);
}
//======================================================== Setup Shaders
//======================================================================
void R8kVolRen3D::setupTexUs()
{
GlErr("set up texture units", "before texture0");
//texture 0 = data
glActiveTexture(GL_TEXTURE0_ARB);
{ //this is for the slice
glEnable(GL_TEXTURE_3D);
}
GlErr("set up texture units", "after texture0");
//texture 1 = VG tf
glActiveTexture(GL_TEXTURE1_ARB);
{ //this is for the transfer function
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, deptexName);
}
GlErr("set up texture units", "after texture1");
//texture 2 = shade volume
glActiveTexture(GL_TEXTURE2_ARB);
{ // for shading or clipping (not both)
glEnable(GL_TEXTURE_3D);
}
GlErr("set up texture units", "after texture2");
//texture 3 = H tf
glActiveTexture(GL_TEXTURE3_ARB);
{ //3rd & 4th axis, or clipping, or shadows
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);
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);
}
}
GlErr("set up texture units", "after texture3");
#if 0
//texture 4 = cube map dependant texture
glActiveTexture(GL_TEXTURE4_ARB);
{ //cube map
glEnable(GL_TEXTURE_CUBE_MAP_ARB);
glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, gluvv.light.cubeName);
}
GlErr("set up texture units", "after texture4");
#endif
#if 0
//texture 5 = shadow texture
glActiveTexture(GL_TEXTURE5_ARB);
{ //shadow