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/*=========================================================================
Program: Visualization Toolkit
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 "vtkActor.h"
#include "vtkCamera.h"
#include "vtkCommand.h"
#include "vtkMath.h"
#include "vtkNew.h"
#include "vtkOpenGLPolyDataMapper.h"
#include "vtkPLYReader.h"
#include "vtkPolyDataNormals.h"
#include "vtkProperty.h"
#include "vtkRegressionTestImage.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkShaderProgram.h"
#include "vtkTestUtilities.h"
#include "vtkTimerLog.h"
#define VTK_CREATE(type, name) \
vtkSmartPointer<type> name = vtkSmartPointer<type>::New()
// -----------------------------------------------------------------------
// Update a uniform in the shader for each render. We do this with a
// callback for the UpdateShaderEvent
class vtkShaderCallback : public vtkCommand
{
public:
static vtkShaderCallback *New()
{ return new vtkShaderCallback; }
vtkRenderer *Renderer;
void Execute(vtkObject *, unsigned long, void*cbo) VTK_OVERRIDE
{
vtkOpenGLHelper *cellBO = reinterpret_cast<vtkOpenGLHelper*>(cbo);
float diffuseColor[3];
#if 0 // trippy mode
float inputHSV[3];
double theTime = vtkTimerLog::GetUniversalTime();
double twopi = 2.0*3.1415926;
inputHSV[0] = sin(twopi*fmod(theTime,3.0)/3.0)/4.0 + 0.25;
inputHSV[1] = sin(twopi*fmod(theTime,4.0)/4.0)/2.0 + 0.5;
inputHSV[2] = 0.7*(sin(twopi*fmod(theTime,19.0)/19.0)/2.0 + 0.5);
vtkMath::HSVToRGB(inputHSV,diffuseColor);
cellBO->Program->SetUniform3f("diffuseColorUniform", diffuseColor);
if (this->Renderer)
{
inputHSV[0] = sin(twopi*fmod(theTime,5.0)/5.0)/4.0 + 0.75;
inputHSV[1] = sin(twopi*fmod(theTime,7.0)/7.0)/2.0 + 0.5;
inputHSV[2] = 0.5*(sin(twopi*fmod(theTime,17.0)/17.0)/2.0 + 0.5);
vtkMath::HSVToRGB(inputHSV,diffuseColor);
this->Renderer->SetBackground(diffuseColor[0], diffuseColor[1], diffuseColor[2]);
inputHSV[0] = sin(twopi*fmod(theTime,11.0)/11.0)/2.0+0.5;
inputHSV[1] = sin(twopi*fmod(theTime,13.0)/13.0)/2.0 + 0.5;
inputHSV[2] = 0.5*(sin(twopi*fmod(theTime,17.0)/17.0)/2.0 + 0.5);
vtkMath::HSVToRGB(inputHSV,diffuseColor);
this->Renderer->SetBackground2(diffuseColor[0], diffuseColor[1], diffuseColor[2]);
}
#else
diffuseColor[0] = 0.4;
diffuseColor[1] = 0.7;
diffuseColor[2] = 0.6;
cellBO->Program->SetUniform3f("diffuseColorUniform", diffuseColor);
#endif
}
vtkShaderCallback() { this->Renderer = 0; }
};
//----------------------------------------------------------------------------
int TestUserShader2(int argc, char *argv[])
{
vtkNew<vtkActor> actor;
vtkNew<vtkRenderer> renderer;
vtkNew<vtkOpenGLPolyDataMapper> mapper;
renderer->SetBackground(0.0, 0.0, 0.0);
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->SetSize(400, 400);
renderWindow->AddRenderer(renderer.Get());
renderer->AddActor(actor.Get());
renderer->GradientBackgroundOn();
vtkNew<vtkRenderWindowInteractor> iren;
iren->SetRenderWindow(renderWindow.Get());
const char* fileName = vtkTestUtilities::ExpandDataFileName(argc, argv,
"Data/dragon.ply");
vtkNew<vtkPLYReader> reader;
reader->SetFileName(fileName);
reader->Update();
vtkNew<vtkPolyDataNormals> norms;
norms->SetInputConnection(reader->GetOutputPort());
norms->Update();
mapper->SetInputConnection(norms->GetOutputPort());
actor->SetMapper(mapper.Get());
actor->GetProperty()->SetAmbientColor(0.2, 0.2, 1.0);
actor->GetProperty()->SetDiffuseColor(1.0, 0.65, 0.7);
actor->GetProperty()->SetSpecularColor(1.0, 1.0, 1.0);
actor->GetProperty()->SetSpecular(0.5);
actor->GetProperty()->SetDiffuse(0.7);
actor->GetProperty()->SetAmbient(0.5);
actor->GetProperty()->SetSpecularPower(20.0);
actor->GetProperty()->SetOpacity(1.0);
// Use our own hardcoded shader code. Generally this is a bad idea in a
// general purpose program as there are so many things VTK supports that
// hardcoded shaders will not handle depth peeling, picking, etc, but if you
// know what your data will be like it can be very useful. The mapper will set
// a bunch of uniforms regardless of if you are using them. But feel free to
// use them :-)
mapper->SetVertexShaderCode(
"//VTK::System::Dec\n" // always start with this line
"attribute vec4 vertexMC;\n"
// use the default normal decl as the mapper
// will then provide the normalMatrix uniform
// which we use later on
"//VTK::Normal::Dec\n"
"uniform mat4 MCDCMatrix;\n"
"void main () {\n"
" normalVCVSOutput = normalMatrix * normalMC;\n"
// do something weird with the vertex positions
// this will mess up your head if you keep
// rotating and looking at it, very trippy
" vec4 tmpPos = MCDCMatrix * vertexMC;\n"
" gl_Position = tmpPos*vec4(0.2+0.8*abs(tmpPos.x),0.2+0.8*abs(tmpPos.y),1.0,1.0);\n"
"}\n"
);
mapper->SetFragmentShaderCode(
"//VTK::System::Dec\n" // always start with this line
"//VTK::Output::Dec\n" // always have this line in your FS
"varying vec3 normalVCVSOutput;\n"
"uniform vec3 diffuseColorUniform;\n"
"void main () {\n"
" float df = max(0.0, normalVCVSOutput.z);\n"
" float sf = pow(df, 20.0);\n"
" vec3 diffuse = df * diffuseColorUniform;\n"
" vec3 specular = sf * vec3(0.4,0.4,0.4);\n"
" gl_FragData[0] = vec4(0.3*abs(normalVCVSOutput) + 0.7*diffuse + specular, 1.0);\n"
"}\n"
);
// Setup a callback to change some uniforms
VTK_CREATE(vtkShaderCallback, myCallback);
myCallback->Renderer = renderer.Get();
mapper->AddObserver(vtkCommand::UpdateShaderEvent,myCallback);
renderWindow->Render();
renderer->GetActiveCamera()->SetPosition(-0.2,0.4,1);
renderer->GetActiveCamera()->SetFocalPoint(0,0,0);
renderer->GetActiveCamera()->SetViewUp(0,1,0);
renderer->ResetCamera();
renderer->GetActiveCamera()->Zoom(2.0);
renderWindow->Render();
int retVal = vtkRegressionTestImage( renderWindow.Get() );
if ( retVal == vtkRegressionTester::DO_INTERACTOR)
{
iren->Start();
}
return EXIT_SUCCESS;
}
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