vtkfixture.cpp

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#include "vtkfixture.h"
 
//VTK
#include <vtkCubeSource.h>
#include <vtkOpenGLPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkProperty.h>
#include <vtkCamera.h>
#include <vtkOpenGLRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkNew.h>
#include <vtkTextureObject.h>
#include <vtkOpenGLVertexArrayObject.h>
#include <vtkOpenGLProperty.h>
#include <vtkOpenGLBufferObject.h>
 
#include "cxGLHelpers.h"
 
#include "texture.h"
#include "shadercallback.h"
 
vtkfixture::vtkfixture()
{
 
}
 
void vtkfixture::printActiveVertexAndFragmentShader(vtkSmartPointer<vtkOpenGLPolyDataMapper> mapper)
{
        char *vertexShader =    mapper->GetVertexShaderCode();
        if(vertexShader)
        {
                std::cout << "VERTEX SHADER:" << std::endl;
                std::cout << vertexShader << std::endl;
        }
 
        char *fragmentShader = mapper->GetFragmentShaderCode();
        if(fragmentShader)
        {
                std::cout << "FRAGMENT SHADER:" << std::endl;
                std::cout << fragmentShader << std::endl;
        }
}
 
void vtkfixture::printOpenGLVersion()
{
        const GLubyte* version = glGetString(GL_VERSION);
        std::cout << "OpenGL version " << version << std::endl;
}
 
 
void vtkfixture::printVtkOpenGLRenderWindowInfo(vtkSmartPointer<vtkOpenGLRenderWindow> opengl_renderwindow)
{
        std::cout << "context support for open gl core 3.2: " << vtkOpenGLRenderWindow::GetContextSupportsOpenGL32() << std::endl;
        std::cout << "context was created at: " << opengl_renderwindow->GetContextCreationTime() << std::endl;
        report_gl_error();
}
 
vtkSmartPointer<vtkTextureObject> vtkfixture::createTextureObject(unsigned int width, unsigned int height, unsigned int depth, int dataType, int numComps, void *data, vtkSmartPointer<vtkOpenGLRenderWindow> opengl_renderwindow)
{
        vtkNew<vtkTextureObject> texture_object;
        texture_object->SetContext(opengl_renderwindow);
 
        if(!texture_object->Create3DFromRaw(width, height, depth, numComps, dataType, data))
                std::cout << "---------------------------------------- > Error creating 3D texture" << std::endl;
 
        //6403 == GL_RED 0x1903
        //6407 == GL_RGB 0x1907
        //6408 == GL_RGBA 0x1908
        std::cout << texture_object->GetFormat(dataType, numComps, true) << std::endl;
 
        texture_object->Activate();
 
        texture_object->SetWrapS(vtkTextureObject::ClampToEdge);
        texture_object->SetWrapT(vtkTextureObject::ClampToEdge);
        texture_object->SetWrapR(vtkTextureObject::ClampToEdge);
        texture_object->SetMagnificationFilter(vtkTextureObject::Linear);
        texture_object->SetMinificationFilter(vtkTextureObject::Linear);
        texture_object->SendParameters();
 
        std::cout << "Texture unit: " << texture_object->GetTextureUnit() << std::endl;
        texture_object->PrintSelf(std::cout, vtkIndent(4));
 
        report_gl_error();
 
        return texture_object.Get();
}
 
vtkSmartPointer<vtkOpenGLBufferObject> vtkfixture::allocateAndUploadArrayBuffer(int numberOfLines, int numberOfComponentsLine, const GLfloat *data)
{
        vtkNew<vtkOpenGLBufferObject> buffer_object;
        std::cout << "ALLOCATING BUFFER" << std::endl;
        buffer_object->GenerateBuffer(vtkOpenGLBufferObject::ArrayBuffer);
        if(!buffer_object->Bind())
                std::cout << "buffer object not bind" << std::endl;
        report_gl_error();
 
        std::cout << "UPLOADING" << std::endl;
        if(!buffer_object->Upload(
                                data,
                                numberOfLines*numberOfComponentsLine,  //how many floats to upload! (aka number of floats in the vector)
                                vtkOpenGLBufferObject::ArrayBuffer
                                ))
        {
                vtkGenericWarningMacro(<< "Error uploading buffer object data.");
        }
        report_gl_error();
 
        return buffer_object.Get();
}
 
void vtkfixture::createVTKWindowWithCylinderSourceWith3DTexture()
{
        // --------------------------------------------------------------------------------
 
        //===========
        // Create mesh
        //===========
        vtkSmartPointer<vtkCubeSource> cube = vtkSmartPointer<vtkCubeSource>::New();
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Create mapper
        //===========
        // The mapper is responsible for pushing the geometry into the graphics library.
        // It may also do color mapping, if scalars or other attributes are defined.
        vtkSmartPointer<vtkOpenGLPolyDataMapper> mapper = vtkSmartPointer<vtkOpenGLPolyDataMapper>::New();
        mapper->SetInputConnection(cube->GetOutputPort());
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Modify vertex shader declarations
        //===========
        mapper->AddShaderReplacement(
                vtkShader::Vertex,
                "//VTK::PositionVC::Dec", // replace the normal block
                true, // before the standard replacements
                "//VTK::PositionVC::Dec\n" // we still want the default
                "attribute vec3 COLOR_VSIN;\n"
                "attribute vec3 TEXTURE_COORDINATE_VSIN;\n"
                "varying vec3 COLOR_VSOUT;\n"
                "varying vec3 TEXTURE_COORDINATE_VSOUT;\n",
                false // only do it once
        );
 
        //===========
        // Modify vertex shader implementations
        //===========
        mapper->AddShaderReplacement(
                vtkShader::Vertex,
                "//VTK::PositionVC::Impl", // replace the normal block
                true, // before the standard replacements
                "//VTK::PositionVC::Impl\n" // we still want the default
                "COLOR_VSOUT = COLOR_VSIN;\n"
                "TEXTURE_COORDINATE_VSOUT = TEXTURE_COORDINATE_VSIN;\n",
                false // only do it once
        );
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Replace the fragment shader
        //===========
        std::string fragment_shader =
                "//VTK::System::Dec\n"  // always start with this line
                "//VTK::Output::Dec\n"  // always have this line in your FS
                "in vec3 COLOR_VSOUT;\n"
                "in vec3 TEXTURE_COORDINATE_VSOUT;\n"
                "uniform sampler3D my_texture_1;\n"
                "uniform sampler3D my_texture_2;\n"
                "out vec4 color;\n"
                "void main () {\n"
                "       vec4 color_1 = texture(my_texture_1, TEXTURE_COORDINATE_VSOUT);\n"
                "       vec4 color_2 = texture(my_texture_2, TEXTURE_COORDINATE_VSOUT);\n"
                "       color = vec4(color_1.xy, color_2.zw);\n"
                "}\n";
        mapper->SetFragmentShaderCode(fragment_shader.c_str());
        //printActiveVertexAndFragmentShader(mapper);
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Create an actor for the mesh
        //===========
        // The actor is a grouping mechanism: besides the geometry (mapper), it
        // also has a property, transformation matrix, and/or texture map.
        // Here we set its color and rotate it around the X and Y axes.
        vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
        actor->SetMapper(mapper);
        //actor->GetProperty()->SetColor(1.0000, 0.3882, 0.2784);
        actor->RotateX(30.0);
        actor->RotateY(-45.0);
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Create the renderer
        //===========
        // The renderer generates the image
        // which is then displayed on the render window.
        // It can be thought of as a scene to which the actor is added
        vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
        renderer->AddActor(actor);
        renderer->SetBackground(0.1, 0.2, 0.4);
        // Zoom in a little by accessing the camera and invoking its "Zoom" method.
        renderer->ResetCamera();
        renderer->GetActiveCamera()->Zoom(1.5);
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Create the render window
        //===========
        // The render window is the actual GUI window
        // that appears on the computer screen
        vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
        renderWindow->SetSize(200, 200);
        renderWindow->AddRenderer(renderer);
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Create the opengl context
        //===========
        // We call Render to create the OpenGL context as it will
        // be needed by the texture object
        //http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=Rendering/OpenGL2/Testing/Cxx/TestCubeMap.cxx
        renderWindow->Render();
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Init GLEW
        //===========
        GLenum err = glewInit();
        if (GLEW_OK != err)
        {
          // Problem: glewInit failed, something is seriously wrong.
          fprintf(stderr, "Error: %s\n", glewGetErrorString(err));
        }
        fprintf(stdout, "Status: Using GLEW %s\n", glewGetString(GLEW_VERSION));
        report_gl_error();
 
        printOpenGLVersion();
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Allocate buffer and upload color data to opengl
        //===========
        //Only need to allocate and upload once
        int my_numberOfColors = numberOfColors;
        int my_numberOfComponentsPerColor = numberOfComponentsPerColor;
        const GLfloat *my_color_data = color_data;
        vtkSmartPointer<vtkOpenGLBufferObject> color_buffer_object = allocateAndUploadArrayBuffer(my_numberOfColors, my_numberOfComponentsPerColor, my_color_data);
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Allocate buffer and upload texture coordinate data to opengl
        //===========
        //Only need to allocate and upload once
        int my_numberOfTextureCoordinates = numberOfTextureCoordinates;
        int my_numberOfComponentsPerTexture = numberOfComponentsPerTexture;
        const GLfloat *my_texture_data = texture_data;
        vtkSmartPointer<vtkOpenGLBufferObject> texture_buffer_object = allocateAndUploadArrayBuffer(my_numberOfTextureCoordinates, my_numberOfComponentsPerTexture, my_texture_data);
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Get OpenGLRenderWindow to be able to make its context current
        //===========
        vtkSmartPointer<vtkOpenGLRenderWindow> opengl_renderwindow = vtkOpenGLRenderWindow::SafeDownCast(renderWindow.Get());
        if(!opengl_renderwindow)
                std::cout << "not opengl_renderwindow" << std::endl;
        else
        {
                printVtkOpenGLRenderWindowInfo(opengl_renderwindow);
        }
        //opengl_renderwindow->MakeCurrent(); //set current context
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Create 3D texture objects
        //===========
        std::cout << "ALLOCATING AND UPLOADING TEXTURE OBJECT" << std::endl;
        unsigned int width = 4;
        unsigned int height = 4;
        unsigned int depth = 4;
 
        int numComps = 3;
        int dataType = VTK_FLOAT;
        void *data1 = (void*)color_data; //numComps=3, dataType = VTK_FLOAT  //4*4*4*3 = 192 < 243 (see shadercallback.h) (WORKS!!!)
        vtkSmartPointer<vtkTextureObject> texture_object_1 = createTextureObject(width, height, depth, dataType, numComps, data1, opengl_renderwindow);
 
        numComps = 4;
        dataType = VTK_UNSIGNED_CHAR;
        void *data2 = generateTexture<unsigned char>(width, height, depth, 200, 140, 0, 200);  //numComps=4, dataType=VTK_UNSIGNED_CHAR (WORKS!!!)
        //void *data2 = generateTexture<float>(width, height, depth, 0.5f, 0.1f, 0.2f, 1.0f);  //numComps=4, dataType=VTK_FLOAT (WORKS!!!)
        vtkSmartPointer<vtkTextureObject> texture_object_2 = createTextureObject(width, height, depth, dataType, numComps, data2, opengl_renderwindow);
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Setup a callback to change some uniforms and attributes
        //===========
        vtkSmartPointer<ShaderCallback> callback = vtkSmartPointer<ShaderCallback>::New();
        callback->mRenderWindow = opengl_renderwindow; //used to set current context
        //callback->mCube = cube; // not used
        callback->mColorBufferObject = color_buffer_object; //used to set in/attribute COLOR_VSIN in vertex shader
        callback->mTextureBufferObject = texture_buffer_object; //used to set in/attribute TEXTURE_COORDINATE_VSIN in vertex shader
        callback->mTextureObject1 = texture_object_1; //used to set sampler in frament shader
        callback->mTextureObject2 = texture_object_2; //used to set sampler in frament shader
 
        mapper->AddObserver(vtkCommand::UpdateShaderEvent,callback);
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Setup a render window interactor
        //===========
        // The render window interactor captures mouse events
        // and will perform appropriate camera or actor manipulation
        // depending on the nature of the events.
        vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
        renderWindowInteractor->SetRenderWindow(renderWindow);
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Render
        //===========
        // This starts the event loop and as a side effect causes an initial render.
        renderWindowInteractor->Start();
 
        // --------------------------------------------------------------------------------
 
        //===========
        // Clean up
        //===========
        renderer->ReleaseGraphicsResources(renderWindow);
 
        //TODO:
        //delete texture coordinate buffer
        //delete color buffer
        //delete texture object1
        //delete texture object2
 
        // --------------------------------------------------------------------------------
}