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vtkOpenGLVolumeTextureMapper3D.cxx
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vtkOpenGLVolumeTextureMapper3D.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkOpenGLVolumeTextureMapper3D.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkWindows.h"
#include "vtkOpenGLVolumeTextureMapper3D.h"
#if !defined(VTK_LEGACY_REMOVE)
#include "vtkImageData.h"
#include "vtkMatrix4x4.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkRenderWindow.h"
#include "vtkRenderer.h"
#include "vtkTimerLog.h"
#include "vtkVolumeProperty.h"
#include "vtkTransform.h"
#include "vtkLightCollection.h"
#include "vtkLight.h"
#include "vtkCamera.h"
#include "vtkMath.h"
#include "vtkOpenGLExtensionManager.h"
#include "vtkgl.h"
#include "vtkOpenGLRenderWindow.h"
#include "vtkOpenGLError.h"
#include "vtkVolumeTextureMapper3D_OneComponentShadeFP.h"
#include "vtkVolumeTextureMapper3D_OneComponentNoShadeFP.h"
#include "vtkVolumeTextureMapper3D_TwoDependentNoShadeFP.h"
#include "vtkVolumeTextureMapper3D_TwoDependentShadeFP.h"
#include "vtkVolumeTextureMapper3D_FourDependentNoShadeFP.h"
#include "vtkVolumeTextureMapper3D_FourDependentShadeFP.h"
vtkStandardNewMacro(vtkOpenGLVolumeTextureMapper3D);
vtkOpenGLVolumeTextureMapper3D::vtkOpenGLVolumeTextureMapper3D()
{
this->Initialized = 0;
this->Volume1Index = 0;
this->Volume2Index = 0;
this->Volume3Index = 0;
this->ColorLookupIndex = 0;
this->AlphaLookupIndex = 0;
this->RenderWindow = NULL;
this->SupportsCompressedTexture = false;
VTK_LEGACY_BODY(vtkOpenGLVolumeTextureMapper3D::vtkOpenGLVolumeTextureMapper3D,"VTK 7.0");
}
vtkOpenGLVolumeTextureMapper3D::~vtkOpenGLVolumeTextureMapper3D()
{
}
// Release the graphics resources used by this texture.
void vtkOpenGLVolumeTextureMapper3D::ReleaseGraphicsResources(vtkWindow
*renWin)
{
if (( this->Volume1Index || this->Volume2Index ||
this->Volume3Index || this->ColorLookupIndex) && renWin)
{
static_cast<vtkRenderWindow *>(renWin)->MakeCurrent();
#ifdef GL_VERSION_1_1
// free any textures
this->DeleteTextureIndex( &this->Volume1Index );
this->DeleteTextureIndex( &this->Volume2Index );
this->DeleteTextureIndex( &this->Volume3Index );
this->DeleteTextureIndex( &this->ColorLookupIndex );
this->DeleteTextureIndex( &this->AlphaLookupIndex );
#endif
}
this->Volume1Index = 0;
this->Volume2Index = 0;
this->Volume3Index = 0;
this->ColorLookupIndex = 0;
this->RenderWindow = NULL;
this->SupportsCompressedTexture=false;
this->SupportsNonPowerOfTwoTextures=false;
this->Modified();
}
void vtkOpenGLVolumeTextureMapper3D::Render(vtkRenderer *ren, vtkVolume *vol)
{
ren->GetRenderWindow()->MakeCurrent();
if ( !this->Initialized )
{
this->Initialize(ren);
}
if ( this->RenderMethod == vtkVolumeTextureMapper3D::NO_METHOD )
{
vtkErrorMacro( "required extensions not supported" );
return;
}
vtkOpenGLClearErrorMacro();
vtkMatrix4x4 *matrix;
double matrixForGL[16];
int numClipPlanes = 0;
double planeEquation[4];
// build transformation
matrix = vol->GetMatrix();
vtkMatrix4x4::Transpose(*matrix->Element, matrixForGL);
glPushAttrib(GL_ENABLE_BIT |
GL_COLOR_BUFFER_BIT |
GL_STENCIL_BUFFER_BIT |
GL_DEPTH_BUFFER_BIT |
GL_POLYGON_BIT |
GL_TEXTURE_BIT);
int i;
// insert model transformation
glMatrixMode( GL_MODELVIEW );
glPushMatrix();
glMultMatrixd(matrixForGL);
// use the OpenGL clip planes
numClipPlanes = this->GetNumberOfClippingPlanes();
if (numClipPlanes > 6)
{
vtkErrorMacro(<< "OpenGL has a limit of 6 clipping planes");
numClipPlanes = 6;
}
for (i = 0; i < numClipPlanes; i++)
{
glEnable(static_cast<GLenum>(GL_CLIP_PLANE0+i));
this->GetClippingPlaneInDataCoords(matrix, i, planeEquation);
glClipPlane(static_cast<GLenum>(GL_CLIP_PLANE0+i), planeEquation);
}
// If an actor turned on culling, it must be turned off here
glDisable (GL_CULL_FACE);
glColor4f( 1.0, 1.0, 1.0, 1.0 );
// Turn lighting off - the polygon textures already have illumination
glDisable( GL_LIGHTING );
if(this->UseCompressedTexture && SupportsCompressedTexture)
{
this->InternalAlpha=vtkgl::COMPRESSED_ALPHA;
this->InternalLA=vtkgl::COMPRESSED_LUMINANCE_ALPHA;
this->InternalRGB=vtkgl::COMPRESSED_RGB;
this->InternalRGBA=vtkgl::COMPRESSED_RGBA;
}
else
{
this->InternalAlpha=GL_ALPHA8;
this->InternalLA=GL_LUMINANCE8_ALPHA8;
this->InternalRGB=GL_RGB8;
this->InternalRGBA=GL_RGBA8;
}
vtkOpenGLCheckErrorMacro("Before actual render method");
switch ( this->RenderMethod )
{
case vtkVolumeTextureMapper3D::NVIDIA_METHOD:
this->RenderNV(ren,vol);
break;
case vtkVolumeTextureMapper3D::FRAGMENT_PROGRAM_METHOD:
this->RenderFP(ren,vol);
break;
}
// pop transformation matrix
glMatrixMode( GL_MODELVIEW );
glPopMatrix();
glPopAttrib();
glFlush();
glFinish();
vtkOpenGLCheckErrorMacro("failed after Render");
this->Timer->StopTimer();
this->TimeToDraw = static_cast<float>(this->Timer->GetElapsedTime());
// If the timer is not accurate enough, set it to a small
// time so that it is not zero
if ( this->TimeToDraw == 0.0 )
{
this->TimeToDraw = 0.0001;
}
}
void vtkOpenGLVolumeTextureMapper3D::RenderFP(vtkRenderer *ren,
vtkVolume *vol)
{
vtkOpenGLClearErrorMacro();
glAlphaFunc (GL_GREATER, static_cast<GLclampf>(0));
glEnable (GL_ALPHA_TEST);
glEnable( GL_BLEND );
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
int components = this->GetInput()->GetNumberOfScalarComponents();
switch ( components )
{
case 1:
if ( !vol->GetProperty()->GetShade() )
{
this->RenderOneIndependentNoShadeFP(ren,vol);
}
else
{
this->RenderOneIndependentShadeFP(ren,vol);
}
break;
case 2:
if ( !vol->GetProperty()->GetShade() )
{
this->RenderTwoDependentNoShadeFP(ren,vol);
}
else
{
this->RenderTwoDependentShadeFP(ren,vol);
}
break;
case 3:
case 4:
if ( !vol->GetProperty()->GetShade() )
{
this->RenderFourDependentNoShadeFP(ren,vol);
}
else
{
this->RenderFourDependentShadeFP(ren,vol);
}
}
vtkgl::ActiveTexture( vtkgl::TEXTURE2);
glDisable( GL_TEXTURE_2D );
glDisable( vtkgl::TEXTURE_3D );
vtkgl::ActiveTexture( vtkgl::TEXTURE1);
glDisable( GL_TEXTURE_2D );
glDisable( vtkgl::TEXTURE_3D );
vtkgl::ActiveTexture( vtkgl::TEXTURE0);
glDisable( GL_TEXTURE_2D );
glDisable( vtkgl::TEXTURE_3D );
vtkOpenGLCheckErrorMacro("failed after RenderFP");
}
void vtkOpenGLVolumeTextureMapper3D::RenderNV( vtkRenderer *ren, vtkVolume *vol )
{
vtkOpenGLClearErrorMacro();
glAlphaFunc (GL_GREATER, static_cast<GLclampf>(0));
glEnable (GL_ALPHA_TEST);
glEnable( GL_BLEND );
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
int components = this->GetInput()->GetNumberOfScalarComponents();
switch ( components )
{
case 1:
if ( !vol->GetProperty()->GetShade() )
{
this->RenderOneIndependentNoShadeNV(ren,vol);
}
else
{
this->RenderOneIndependentShadeNV(ren,vol);
}
break;
case 2:
if ( !vol->GetProperty()->GetShade() )
{
this->RenderTwoDependentNoShadeNV(ren,vol);
}
else
{
this->RenderTwoDependentShadeNV(ren,vol);
}
break;
case 3:
case 4:
if ( !vol->GetProperty()->GetShade() )
{
this->RenderFourDependentNoShadeNV(ren,vol);
}
else
{
this->RenderFourDependentShadeNV(ren,vol);
}
}
vtkgl::ActiveTexture( vtkgl::TEXTURE2 );
glDisable( GL_TEXTURE_2D );
glDisable( vtkgl::TEXTURE_3D );
vtkgl::ActiveTexture( vtkgl::TEXTURE1 );
glDisable( GL_TEXTURE_2D );
glDisable( vtkgl::TEXTURE_3D );
vtkgl::ActiveTexture( vtkgl::TEXTURE0 );
glDisable( GL_TEXTURE_2D );
glDisable( vtkgl::TEXTURE_3D );
glDisable( vtkgl::TEXTURE_SHADER_NV );
glDisable(vtkgl::REGISTER_COMBINERS_NV);
vtkOpenGLCheckErrorMacro("failed after RenderNV");
}
void vtkOpenGLVolumeTextureMapper3D::DeleteTextureIndex( GLuint *index )
{
if (glIsTexture(*index))
{
GLuint tempIndex;
tempIndex = *index;
glDeleteTextures(1, &tempIndex);
vtkOpenGLCheckErrorMacro("failed at glDeleteTextures");
*index = 0;
}
}
void vtkOpenGLVolumeTextureMapper3D::CreateTextureIndex( GLuint *index )
{
GLuint tempIndex=0;
glGenTextures(1, &tempIndex);
*index = static_cast<long>(tempIndex);
}
void vtkOpenGLVolumeTextureMapper3D::RenderPolygons( vtkRenderer *ren,
vtkVolume *vol,
int stages[4] )
{
vtkRenderWindow *renWin = ren->GetRenderWindow();
if ( renWin->CheckAbortStatus() )
{
return;
}
vtkOpenGLClearErrorMacro();
double bounds[27][6];
float distance2[27];
int numIterations;
int i, j, k;
// No cropping case - render the whole thing
if ( !this->Cropping )
{
// Use the input data bounds - we'll take care of the volume's
// matrix during rendering
this->GetInput()->GetBounds(bounds[0]);
numIterations = 1;
}
// Simple cropping case - render the subvolume
else if ( this->CroppingRegionFlags == 0x2000 )
{
this->GetCroppingRegionPlanes(bounds[0]);
numIterations = 1;
}
// Complex cropping case - render each region in back-to-front order
else
{
// Get the camera position
double camPos[4];
ren->GetActiveCamera()->GetPosition(camPos);
double volBounds[6];
this->GetInput()->GetBounds(volBounds);
// Pass camera through inverse volume matrix
// so that we are in the same coordinate system
vtkMatrix4x4 *volMatrix = vtkMatrix4x4::New();
vol->GetMatrix( volMatrix );
camPos[3] = 1.0;
volMatrix->Invert();
volMatrix->MultiplyPoint( camPos, camPos );
volMatrix->Delete();
if ( camPos[3] )
{
camPos[0] /= camPos[3];
camPos[1] /= camPos[3];
camPos[2] /= camPos[3];
}
// These are the region limits for x (first four), y (next four) and
// z (last four). The first region limit is the lower bound for
// that axis, the next two are the region planes along that axis, and
// the final one in the upper bound for that axis.
float limit[12];
for ( i = 0; i < 3; i++ )
{
limit[i*4 ] = volBounds[i*2];
limit[i*4+1] = this->CroppingRegionPlanes[i*2];
limit[i*4+2] = this->CroppingRegionPlanes[i*2+1];
limit[i*4+3] = volBounds[i*2+1];
}
// For each of the 27 possible regions, find out if it is enabled,
// and if so, compute the bounds and the distance from the camera
// to the center of the region.
int numRegions = 0;
int region;
for ( region = 0; region < 27; region++ )
{
int regionFlag = 1<<region;
if ( this->CroppingRegionFlags & regionFlag )
{
// what is the coordinate in the 3x3x3 grid
int loc[3];
loc[0] = region%3;
loc[1] = (region/3)%3;
loc[2] = (region/9)%3;
// compute the bounds and center
float center[3];
for ( i = 0; i < 3; i++ )
{
bounds[numRegions][i*2 ] = limit[4*i+loc[i]];
bounds[numRegions][i*2+1] = limit[4*i+loc[i]+1];
center[i] =
(bounds[numRegions][i*2 ] +
bounds[numRegions][i*2+1])/2.0;
}
// compute the distance squared to the center
distance2[numRegions] =
(camPos[0]-center[0])*(camPos[0]-center[0]) +
(camPos[1]-center[1])*(camPos[1]-center[1]) +
(camPos[2]-center[2])*(camPos[2]-center[2]);
// we've added one region
numRegions++;
}
}
// Do a quick bubble sort on distance
for ( i = 1; i < numRegions; i++ )
{
for ( j = i; j > 0 && distance2[j] > distance2[j-1]; j-- )
{
float tmpBounds[6];
float tmpDistance2;
for ( k = 0; k < 6; k++ )
{
tmpBounds[k] = bounds[j][k];
}
tmpDistance2 = distance2[j];
for ( k = 0; k < 6; k++ )
{
bounds[j][k] = bounds[j-1][k];
}
distance2[j] = distance2[j-1];
for ( k = 0; k < 6; k++ )
{
bounds[j-1][k] = tmpBounds[k];
}
distance2[j-1] = tmpDistance2;
}
}
numIterations = numRegions;
}
// loop over all regions we need to render
for ( int loop = 0;
loop < numIterations;
loop++ )
{
// Compute the set of polygons for this region
// according to the bounds
this->ComputePolygons( ren, vol, bounds[loop] );
// Loop over the polygons
for ( i = 0; i < this->NumberOfPolygons; i++ )
{
if ( i%64 == 1 )
{
glFlush();
glFinish();
}
if ( renWin->CheckAbortStatus() )
{
return;
}
float *ptr = this->PolygonBuffer + 36*i;
glBegin( GL_TRIANGLE_FAN );
for ( j = 0; j < 6; j++ )
{
if ( ptr[0] < 0.0 )
{
break;
}
for ( k = 0; k < 4; k++ )
{
if ( stages[k] )
{
vtkgl::MultiTexCoord3fv( vtkgl::TEXTURE0 + k, ptr );
}
}
glVertex3fv( ptr+3 );
ptr += 6;
}
glEnd();
}
}
vtkOpenGLCheckErrorMacro("failed after RenderPolygons");
}
void vtkOpenGLVolumeTextureMapper3D::Setup3DTextureParameters( vtkVolumeProperty *property )
{
vtkOpenGLClearErrorMacro();
if ( property->GetInterpolationType() == VTK_NEAREST_INTERPOLATION )
{
glTexParameterf( vtkgl::TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
glTexParameterf( vtkgl::TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
}
else
{
glTexParameterf( vtkgl::TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexParameterf( vtkgl::TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
}
glTexParameterf( vtkgl::TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP );
glTexParameterf( vtkgl::TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP );
vtkOpenGLCheckErrorMacro("failed after Setup3DTextureParameters");
}
void vtkOpenGLVolumeTextureMapper3D::SetupOneIndependentTextures( vtkRenderer *vtkNotUsed(ren),
vtkVolume *vol )
{
vtkOpenGLClearErrorMacro();
vtkgl::ActiveTexture( vtkgl::TEXTURE0 );
glDisable( GL_TEXTURE_2D );
glEnable( vtkgl::TEXTURE_3D );
if ( this->RenderMethod == vtkVolumeTextureMapper3D::NVIDIA_METHOD )
{
glEnable( vtkgl::TEXTURE_SHADER_NV );
glTexEnvi(vtkgl::TEXTURE_SHADER_NV, vtkgl::SHADER_OPERATION_NV, vtkgl::TEXTURE_3D);
}
vtkgl::ActiveTexture( vtkgl::TEXTURE2 );
glDisable( GL_TEXTURE_2D );
glEnable( vtkgl::TEXTURE_3D );
if ( this->RenderMethod == vtkVolumeTextureMapper3D::NVIDIA_METHOD )
{
glEnable( vtkgl::TEXTURE_SHADER_NV );
glTexEnvi(vtkgl::TEXTURE_SHADER_NV, vtkgl::SHADER_OPERATION_NV, vtkgl::TEXTURE_3D);
}
// Update the volume containing the 2 byte scalar / gradient magnitude
if ( this->UpdateVolumes( vol ) || !this->Volume1Index || !this->Volume2Index )
{
int dim[3];
this->GetVolumeDimensions(dim);
this->DeleteTextureIndex(&this->Volume3Index);
vtkgl::ActiveTexture( vtkgl::TEXTURE0 );
glBindTexture(vtkgl::TEXTURE_3D,0);
this->DeleteTextureIndex(&this->Volume1Index);
this->CreateTextureIndex(&this->Volume1Index);
glBindTexture(vtkgl::TEXTURE_3D, this->Volume1Index);
vtkgl::TexImage3D(vtkgl::TEXTURE_3D,0,this->InternalLA,dim[0],dim[1],
dim[2],0,GL_LUMINANCE_ALPHA,GL_UNSIGNED_BYTE,
this->Volume1);
vtkgl::ActiveTexture( vtkgl::TEXTURE2 );
glBindTexture(vtkgl::TEXTURE_3D,0);
this->DeleteTextureIndex(&this->Volume2Index);
this->CreateTextureIndex(&this->Volume2Index);
glBindTexture(vtkgl::TEXTURE_3D, this->Volume2Index);
vtkgl::TexImage3D(vtkgl::TEXTURE_3D,0,this->InternalRGB,dim[0],dim[1],
dim[2],0,GL_RGB,GL_UNSIGNED_BYTE,this->Volume2);
}
vtkgl::ActiveTexture( vtkgl::TEXTURE0 );
glBindTexture(vtkgl::TEXTURE_3D, this->Volume1Index);
this->Setup3DTextureParameters( vol->GetProperty() );
vtkgl::ActiveTexture( vtkgl::TEXTURE2 );
glBindTexture(vtkgl::TEXTURE_3D, this->Volume2Index);
this->Setup3DTextureParameters( vol->GetProperty() );
vtkgl::ActiveTexture( vtkgl::TEXTURE1 );
glEnable( GL_TEXTURE_2D );
glDisable( vtkgl::TEXTURE_3D );
if ( this->RenderMethod == vtkVolumeTextureMapper3D::NVIDIA_METHOD )
{
glTexEnvf ( vtkgl::TEXTURE_SHADER_NV, vtkgl::SHADER_OPERATION_NV,
vtkgl::DEPENDENT_AR_TEXTURE_2D_NV );
glTexEnvi(vtkgl::TEXTURE_SHADER_NV, vtkgl::PREVIOUS_TEXTURE_INPUT_NV, vtkgl::TEXTURE0);
}
// Update the dependent 2D color table mapping scalar value and
// gradient magnitude to RGBA
if ( this->UpdateColorLookup( vol ) || !this->ColorLookupIndex )
{
this->DeleteTextureIndex( &this->ColorLookupIndex );
this->DeleteTextureIndex( &this->AlphaLookupIndex );
this->CreateTextureIndex( &this->ColorLookupIndex );
glBindTexture(GL_TEXTURE_2D, this->ColorLookupIndex);
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );
glTexImage2D( GL_TEXTURE_2D, 0,this->InternalRGBA, 256, 256, 0,
GL_RGBA, GL_UNSIGNED_BYTE, this->ColorLookup );
}
glBindTexture(GL_TEXTURE_2D, this->ColorLookupIndex);
vtkOpenGLCheckErrorMacro("failed after SetupOneIndependentTextures");
}
void vtkOpenGLVolumeTextureMapper3D::SetupRegisterCombinersNoShadeNV( vtkRenderer *vtkNotUsed(ren),
vtkVolume *vtkNotUsed(vol),
int components )
{
vtkOpenGLClearErrorMacro();
if ( components < 3 )
{
vtkgl::ActiveTexture(vtkgl::TEXTURE2);
glTexEnvi(vtkgl::TEXTURE_SHADER_NV, vtkgl::SHADER_OPERATION_NV, GL_NONE);
if ( components == 1 )
{
vtkgl::ActiveTexture(vtkgl::TEXTURE3);
glTexEnvi(vtkgl::TEXTURE_SHADER_NV, vtkgl::SHADER_OPERATION_NV, GL_NONE);
}
}
glEnable(vtkgl::REGISTER_COMBINERS_NV);
vtkgl::CombinerParameteriNV(vtkgl::NUM_GENERAL_COMBINERS_NV, 1);
vtkgl::CombinerParameteriNV(vtkgl::COLOR_SUM_CLAMP_NV, GL_TRUE);
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_A_NV, GL_ZERO, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_B_NV, GL_ZERO, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_C_NV, GL_ZERO, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
if ( components < 3 )
{
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_D_NV, vtkgl::TEXTURE1, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
}
else
{
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_D_NV, vtkgl::TEXTURE0, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
}
if ( components == 1 )
{
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_G_NV, vtkgl::TEXTURE1, vtkgl::UNSIGNED_IDENTITY_NV, GL_ALPHA);
}
else
{
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_G_NV, vtkgl::TEXTURE3, vtkgl::UNSIGNED_IDENTITY_NV, GL_ALPHA);
}
vtkOpenGLCheckErrorMacro("failed after SetupRegisterCombinersNoShadeNV");
}
void vtkOpenGLVolumeTextureMapper3D::SetupRegisterCombinersShadeNV( vtkRenderer *ren,
vtkVolume *vol,
int components )
{
vtkOpenGLClearErrorMacro();
if ( components == 1 )
{
vtkgl::ActiveTexture(vtkgl::TEXTURE3);
glTexEnvi(vtkgl::TEXTURE_SHADER_NV, vtkgl::SHADER_OPERATION_NV, GL_NONE);
}
GLfloat white[4] = {1,1,1,1};
GLfloat lightDirection[2][4];
GLfloat lightDiffuseColor[2][4];
GLfloat lightSpecularColor[2][4];
GLfloat halfwayVector[2][4];
GLfloat ambientColor[4];
// Gather information about the light sources. Although we gather info for multiple light sources,
// in this case we will only use the first one, and will duplicate it (in opposite direction) to
// approximate two-sided lighting.
this->GetLightInformation( ren, vol, lightDirection, lightDiffuseColor,
lightSpecularColor, halfwayVector, ambientColor );
float specularPower = vol->GetProperty()->GetSpecularPower();
glEnable(vtkgl::REGISTER_COMBINERS_NV);
glEnable( vtkgl::PER_STAGE_CONSTANTS_NV );
vtkgl::CombinerParameteriNV(vtkgl::NUM_GENERAL_COMBINERS_NV, 8);
vtkgl::CombinerParameteriNV(vtkgl::COLOR_SUM_CLAMP_NV, GL_TRUE);
// Stage 0
//
// N dot L is computed into vtkgl::SPARE0_NV
// -N dot L is computed into vtkgl::SPARE1_NV
//
vtkgl::CombinerStageParameterfvNV( vtkgl::COMBINER0_NV, vtkgl::CONSTANT_COLOR0_NV, lightDirection[0] );
vtkgl::CombinerInputNV( vtkgl::COMBINER0_NV, GL_RGB, vtkgl::VARIABLE_A_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::EXPAND_NORMAL_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER0_NV, GL_RGB, vtkgl::VARIABLE_B_NV,
vtkgl::TEXTURE2, vtkgl::EXPAND_NORMAL_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER0_NV, GL_RGB, vtkgl::VARIABLE_C_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::EXPAND_NORMAL_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER0_NV, GL_RGB, vtkgl::VARIABLE_D_NV,
vtkgl::TEXTURE2, vtkgl::EXPAND_NEGATE_NV, GL_RGB );
vtkgl::CombinerOutputNV( vtkgl::COMBINER0_NV, GL_RGB, vtkgl::SPARE0_NV, vtkgl::SPARE1_NV, vtkgl::DISCARD_NV,
GL_NONE, GL_NONE, GL_TRUE, GL_TRUE, GL_FALSE );
// Stage 1
//
// lightColor * max( 0, (N dot L)) + lightColor * max( 0, (-N dot L)) is computed into vtkgl::SPARE0_NV
//
vtkgl::CombinerStageParameterfvNV( vtkgl::COMBINER1_NV, vtkgl::CONSTANT_COLOR0_NV, lightDiffuseColor[0] );
vtkgl::CombinerInputNV( vtkgl::COMBINER1_NV, GL_RGB, vtkgl::VARIABLE_A_NV,
vtkgl::SPARE0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER1_NV, GL_RGB, vtkgl::VARIABLE_B_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER1_NV, GL_RGB, vtkgl::VARIABLE_C_NV,
vtkgl::SPARE1_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER1_NV, GL_RGB, vtkgl::VARIABLE_D_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerOutputNV( vtkgl::COMBINER1_NV, GL_RGB, vtkgl::DISCARD_NV, vtkgl::DISCARD_NV,
vtkgl::SPARE0_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE );
// Stage 2
//
// result from Stage 1 is added to the ambient color and stored in vtkgl::PRIMARY_COLOR_NV
//
vtkgl::CombinerStageParameterfvNV( vtkgl::COMBINER2_NV, vtkgl::CONSTANT_COLOR0_NV, white );
vtkgl::CombinerStageParameterfvNV( vtkgl::COMBINER2_NV, vtkgl::CONSTANT_COLOR1_NV, ambientColor );
vtkgl::CombinerInputNV( vtkgl::COMBINER2_NV, GL_RGB, vtkgl::VARIABLE_A_NV,
vtkgl::SPARE0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER2_NV, GL_RGB, vtkgl::VARIABLE_B_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER2_NV, GL_RGB, vtkgl::VARIABLE_C_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER2_NV, GL_RGB, vtkgl::VARIABLE_D_NV,
vtkgl::CONSTANT_COLOR1_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerOutputNV( vtkgl::COMBINER2_NV, GL_RGB, vtkgl::DISCARD_NV, vtkgl::DISCARD_NV,
vtkgl::PRIMARY_COLOR_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE );
// Stage 3
//
// N dot H is computed into vtkgl::SPARE0_NV
// -N dot H is computed into vtkgl::SPARE1_NV
//
vtkgl::CombinerStageParameterfvNV( vtkgl::COMBINER3_NV, vtkgl::CONSTANT_COLOR0_NV, halfwayVector[0] );
vtkgl::CombinerInputNV( vtkgl::COMBINER3_NV, GL_RGB, vtkgl::VARIABLE_A_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::EXPAND_NORMAL_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER3_NV, GL_RGB, vtkgl::VARIABLE_B_NV,
vtkgl::TEXTURE2, vtkgl::EXPAND_NORMAL_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER3_NV, GL_RGB, vtkgl::VARIABLE_C_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::EXPAND_NORMAL_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER3_NV, GL_RGB, vtkgl::VARIABLE_D_NV,
vtkgl::TEXTURE2, vtkgl::EXPAND_NEGATE_NV, GL_RGB );
vtkgl::CombinerOutputNV( vtkgl::COMBINER3_NV, GL_RGB, vtkgl::SPARE0_NV, vtkgl::SPARE1_NV,
vtkgl::DISCARD_NV, GL_NONE, GL_NONE, GL_TRUE, GL_TRUE, GL_FALSE );
// Stage 4
//
// if the specular power is greater than 1, then
//
// N dot H squared is computed into vtkgl::SPARE0_NV
// -N dot H squared is computed into vtkgl::SPARE1_NV
//
// otherwise these registers are simply multiplied by white
vtkgl::CombinerStageParameterfvNV( vtkgl::COMBINER4_NV, vtkgl::CONSTANT_COLOR0_NV, white );
vtkgl::CombinerInputNV( vtkgl::COMBINER4_NV, GL_RGB, vtkgl::VARIABLE_A_NV,
vtkgl::SPARE0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER4_NV, GL_RGB, vtkgl::VARIABLE_C_NV,
vtkgl::SPARE1_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
if ( specularPower > 1.0 )
{
vtkgl::CombinerInputNV( vtkgl::COMBINER4_NV, GL_RGB, vtkgl::VARIABLE_B_NV,
vtkgl::SPARE0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER4_NV, GL_RGB, vtkgl::VARIABLE_D_NV,
vtkgl::SPARE1_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
}
else
{
vtkgl::CombinerInputNV( vtkgl::COMBINER4_NV, GL_RGB, vtkgl::VARIABLE_B_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER4_NV, GL_RGB, vtkgl::VARIABLE_D_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
}
vtkgl::CombinerOutputNV( vtkgl::COMBINER4_NV, GL_RGB, vtkgl::SPARE0_NV, vtkgl::SPARE1_NV, vtkgl::DISCARD_NV,
GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE );
// Stage 5
//
// if the specular power is greater than 3, then
//
// N dot H to the fourth is computed into vtkgl::SPARE0_NV
// -N dot H to the fourth is computed into vtkgl::SPARE1_NV
//
// otherwise these registers are simply multiplied by white
vtkgl::CombinerStageParameterfvNV( vtkgl::COMBINER5_NV, vtkgl::CONSTANT_COLOR0_NV, white );
vtkgl::CombinerInputNV( vtkgl::COMBINER5_NV, GL_RGB, vtkgl::VARIABLE_A_NV,
vtkgl::SPARE0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER5_NV, GL_RGB, vtkgl::VARIABLE_C_NV,
vtkgl::SPARE1_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
if ( specularPower > 3.0 )
{
vtkgl::CombinerInputNV( vtkgl::COMBINER5_NV, GL_RGB, vtkgl::VARIABLE_B_NV,
vtkgl::SPARE0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER5_NV, GL_RGB, vtkgl::VARIABLE_D_NV,
vtkgl::SPARE1_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
}
else
{
vtkgl::CombinerInputNV( vtkgl::COMBINER5_NV, GL_RGB, vtkgl::VARIABLE_B_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER5_NV, GL_RGB, vtkgl::VARIABLE_D_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
}
vtkgl::CombinerOutputNV( vtkgl::COMBINER5_NV, GL_RGB, vtkgl::SPARE0_NV, vtkgl::SPARE1_NV, vtkgl::DISCARD_NV,
GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE );
// Stage 6
//
// if the specular power is greater than 6, then
//
// N dot H to the eighth is computed into vtkgl::SPARE0_NV
// -N dot H to the eighth is computed into vtkgl::SPARE1_NV
//
// otherwise these registers are simply multiplied by white
vtkgl::CombinerStageParameterfvNV( vtkgl::COMBINER6_NV, vtkgl::CONSTANT_COLOR0_NV, white );
vtkgl::CombinerInputNV( vtkgl::COMBINER6_NV, GL_RGB, vtkgl::VARIABLE_A_NV,
vtkgl::SPARE0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER6_NV, GL_RGB, vtkgl::VARIABLE_C_NV,
vtkgl::SPARE1_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
if ( specularPower > 6.0 )
{
vtkgl::CombinerInputNV( vtkgl::COMBINER6_NV, GL_RGB, vtkgl::VARIABLE_B_NV,
vtkgl::SPARE0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER6_NV, GL_RGB, vtkgl::VARIABLE_D_NV,
vtkgl::SPARE1_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
}
else
{
vtkgl::CombinerInputNV( vtkgl::COMBINER6_NV, GL_RGB, vtkgl::VARIABLE_B_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER6_NV, GL_RGB, vtkgl::VARIABLE_D_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
}
vtkgl::CombinerOutputNV( vtkgl::COMBINER6_NV, GL_RGB, vtkgl::SPARE0_NV, vtkgl::SPARE1_NV,
vtkgl::DISCARD_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE );
// Stage 7
//
// Add the two specular contributions and multiply each by the specular color.
vtkgl::CombinerStageParameterfvNV( vtkgl::COMBINER7_NV, vtkgl::CONSTANT_COLOR0_NV, lightSpecularColor[0] );
vtkgl::CombinerStageParameterfvNV( vtkgl::COMBINER7_NV, vtkgl::CONSTANT_COLOR1_NV, lightSpecularColor[1] );
vtkgl::CombinerInputNV( vtkgl::COMBINER7_NV, GL_RGB, vtkgl::VARIABLE_A_NV,
vtkgl::SPARE0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER7_NV, GL_RGB, vtkgl::VARIABLE_B_NV,
vtkgl::CONSTANT_COLOR0_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER7_NV, GL_RGB, vtkgl::VARIABLE_C_NV,
vtkgl::SPARE1_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerInputNV( vtkgl::COMBINER7_NV, GL_RGB, vtkgl::VARIABLE_D_NV,
vtkgl::CONSTANT_COLOR1_NV, vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::CombinerOutputNV( vtkgl::COMBINER7_NV, GL_RGB, vtkgl::DISCARD_NV,
vtkgl::DISCARD_NV, vtkgl::SPARE0_NV,
GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE );
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_A_NV, vtkgl::PRIMARY_COLOR_NV,
vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
if ( components < 3 )
{
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_B_NV, vtkgl::TEXTURE1,
vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
}
else
{
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_B_NV, vtkgl::TEXTURE0,
vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
}
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_C_NV, GL_ZERO,
vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_D_NV, vtkgl::SPARE0_NV,
vtkgl::UNSIGNED_IDENTITY_NV, GL_RGB );
if ( components == 1 )
{
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_G_NV, vtkgl::TEXTURE1,
vtkgl::UNSIGNED_IDENTITY_NV, GL_ALPHA);
}
else
{
vtkgl::FinalCombinerInputNV(vtkgl::VARIABLE_G_NV, vtkgl::TEXTURE3,
vtkgl::UNSIGNED_IDENTITY_NV, GL_ALPHA);
}
vtkOpenGLCheckErrorMacro("failed after SetupRegisterCombinersShadeNV");
}
void vtkOpenGLVolumeTextureMapper3D::RenderOneIndependentNoShadeNV(
vtkRenderer *ren,
vtkVolume *vol )
{
this->SetupOneIndependentTextures( ren, vol );
// Start the timer now
this->Timer->StartTimer();
this->SetupRegisterCombinersNoShadeNV( ren, vol, 1 );
int stages[4] = {1,0,0,0};
this->RenderPolygons( ren, vol, stages );
}
void vtkOpenGLVolumeTextureMapper3D::RenderOneIndependentShadeNV(
vtkRenderer *ren,
vtkVolume *vol )
{
this->SetupOneIndependentTextures( ren, vol );
// Start the timer now
this->Timer->StartTimer();
this->SetupRegisterCombinersShadeNV( ren, vol, 1 );
int stages[4] = {1,0,1,0};
this->RenderPolygons( ren, vol, stages );
}
void vtkOpenGLVolumeTextureMapper3D::SetupTwoDependentTextures(
vtkRenderer *vtkNotUsed(ren),
vtkVolume *vol )
{
vtkOpenGLClearErrorMacro();
vtkgl::ActiveTexture( vtkgl::TEXTURE0 );
glDisable( GL_TEXTURE_2D );