cxTextureSlicePainter.cpp

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/*=========================================================================
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Copyright (c) 2008-2014, SINTEF Department of Medical Technology
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/*
 * vmTextureSlicePainter.cpp
 *
 *  Created on: Oct 13, 2009
 *      Author: petterw
 */

#include "cxTextureSlicePainter.h"

//#ifndef WIN32
//#ifndef CX_VTK_OPENGL2
#if !defined(CX_VTK_OPENGL2) && !defined(WIN32)
#include <QtCore>
#include <vtkOpenGLExtensionManager.h>
#include <vtkRenderer.h>
#include <vtkShaderProgram2.h>
#include <vtkShader2.h>
#include <vtkShader2Collection.h>
#include <vtkUniformVariables.h>
#include <vtkObjectFactory.h>
#include <vtkOpenGLRenderWindow.h>


#ifdef __APPLE__
#include <OpenGL/glu.h>
#include "X11/Xlib.h"
//#include "/usr/include/X11/Xlib.h"
#else
#include <GL/glu.h>
#endif

#ifdef WIN32
#include <windows.h>
#include <GL/glext.h>
#endif

#include "cxGPUImageBuffer.h"
#include "cxTypeConversions.h"
#include "cxGLHelpers.h"

//---------------------------------------------------------
namespace cx
{
//---------------------------------------------------------

vtkStandardNewMacro(TextureSlicePainter);

SingleVolumePainterHelper::SingleVolumePainterHelper(int index) :
                mWindow(0.0),
                mLevel(0.0),
                mLLR(0.0),
                mAlpha(1.0)
{
        mIndex = index;
}

SingleVolumePainterHelper::SingleVolumePainterHelper() :
        mWindow(0.0),
        mLevel(0.0),
        mLLR(0.0),
        mAlpha(1.0)
{
        mIndex = -1;
}

SingleVolumePainterHelper::~SingleVolumePainterHelper()
{

}

void SingleVolumePainterHelper::SetBuffer(GPUImageDataBufferPtr buffer)
{
        mVolumeBuffer = buffer;
}

void SingleVolumePainterHelper::SetBuffer(GPUImageLutBufferPtr buffer)
{
        mLutBuffer = buffer;
}

void SingleVolumePainterHelper::SetColorAttribute(float window, float level, float llr,float alpha)
{
        mWindow = window;
        mLevel = level;
        mLLR = llr;
        mAlpha = alpha;
}

void SingleVolumePainterHelper::initializeRendering()
{
        if (mVolumeBuffer)
                mVolumeBuffer->allocate();
        if (mLutBuffer)
                mLutBuffer->allocate();
}

void SingleVolumePainterHelper::setUniformiArray(vtkUniformVariables* uniforms, QString name, int val)
{
        QString fullName = QString("%1[%2]").arg(name).arg(mIndex);
        uniforms->SetUniformi(cstring_cast(fullName), 1, &val);
}

void SingleVolumePainterHelper::setUniformfArray(vtkUniformVariables* uniforms, QString name, float val)
{
        QString fullName = QString("%1[%2]").arg(name).arg(mIndex);
        uniforms->SetUniformf(cstring_cast(fullName), 1, &val);
}

void SingleVolumePainterHelper::eachRenderInternal(vtkSmartPointer<vtkShaderProgram2> shader)
{
        if (!mVolumeBuffer)
                return;

        mVolumeBuffer->bind(mIndex);

        int texture = 2*mIndex; //texture unit 1
        int lut = 2*mIndex+1; //texture unit 1

        int lutsize = 0;
        if (mLutBuffer)
        {
                mLutBuffer->bind(mIndex);
                lutsize = mLutBuffer->getLutSize();
        }

        vtkUniformVariables* uniforms = shader->GetUniformVariables();
        this->setUniformiArray(uniforms, "texture", texture);
        this->setUniformiArray(uniforms, "lut", lut);
        this->setUniformiArray(uniforms, "lutsize", lutsize);
        this->setUniformfArray(uniforms, "llr", mLLR);
        this->setUniformfArray(uniforms, "level", mLevel);
        this->setUniformfArray(uniforms, "window", mWindow);
        this->setUniformfArray(uniforms, "alpha", mAlpha);

        report_gl_error();
}

//---------------------------------------------------------
TextureSlicePainter::TextureSlicePainter() :
        hasLoadedExtensions(false)
{
}

void TextureSlicePainter::setShaderPath(QString path)
{
        mShaderPath = path;
}

QString TextureSlicePainter::loadShaderFile()
{       
        QString filepath = mShaderPath + "/cxOverlay2D_frag.glsl";
        QFile fp(filepath);
        if (fp.exists())
        {
                fp.open(QFile::ReadOnly);
                QTextStream shaderfile(&fp);
                return shaderfile.readAll();
        }
        else
        {
                std::cout << "TextureSlicer can't read shaderfile [" << fp.fileName() << "]" << std::endl;
        }
        return "";
}

TextureSlicePainter::~TextureSlicePainter()
{
        if (this->LastContext)
        {
            this->ReleaseGraphicsResources(this->LastWindow);
        }
}

void TextureSlicePainter::ReleaseGraphicsResources(vtkWindow* win)
{
        if (this->Shader != 0)
        {
                this->Shader->ReleaseGraphicsResources();
                this->Shader = 0;
        }

        this->ClearGraphicsResources(); //the shader
        this->LastContext = 0;
        this->Superclass::ReleaseGraphicsResources(win);
}

void TextureSlicePainter::PrepareForRendering(vtkRenderer* renderer, vtkActor* actor)
{
        report_gl_error();
        if (!CanRender(renderer, actor))
        {
                this->ClearGraphicsResources();
                this->LastContext = 0;
                this->Superclass::PrepareForRendering(renderer, actor);
                return;
        }

        GLint oldTextureUnit;
        glGetIntegerv(GL_ACTIVE_TEXTURE, &oldTextureUnit);

        vtkRenderWindow* renWin = renderer->GetRenderWindow();
        if (this->LastContext != renWin)
        {
                this->ClearGraphicsResources();
                hasLoadedExtensions = false; // force re-check
        }
        this->LastContext = renWin;

        vtkOpenGLRenderWindow *context = vtkOpenGLRenderWindow::SafeDownCast(renWin);
        if (!hasLoadedExtensions)
        {
                if (!this->LoadRequiredExtensions(context->GetExtensionManager()))
                {
                        return;
                }
                hasLoadedExtensions = true;
        }

        for (unsigned i = 0; i < this->mElement.size(); ++i)
                this->mElement[i].initializeRendering();

        if (!this->Shader)
        {
                report_gl_error();
                QString shaderSource = this->loadShaderFile();
                shaderSource = this->replaceShaderSourceMacros(shaderSource);
//              int layers = this->mElement.size();
//              shaderSource = shaderSource.replace("${LAYERS}", QString("%1").arg(layers));

                this->buildProgram(shaderSource, context);
        }

        glPixelStorei(GL_PACK_ALIGNMENT, 1);
        glPixelStorei(GL_PACK_ROW_LENGTH, 0);
        glPixelStorei(GL_PACK_SKIP_ROWS, 0);
        glPixelStorei(GL_PACK_SKIP_PIXELS, 0);

        this->Superclass::PrepareForRendering(renderer, actor);
        report_gl_error();
        glActiveTexture(oldTextureUnit);
}

QString TextureSlicePainter::replaceShaderSourceMacros(QString shaderSource)
{
        // set constant layers
        int layers = this->mElement.size();
        shaderSource = shaderSource.replace("${LAYERS}", QString("%1").arg(layers));

        // fill function vec4 sampleLut(in int index, in float idx)
        QString element = "\tif (index==%1) return texture1D(lut[%1], idx);\n";
        QString sampleLutContent;
        for (unsigned i=0; i<layers; ++i)
                sampleLutContent += element.arg(i);
        shaderSource = shaderSource.replace("${SAMPLE_LUT_CONTENT}", sampleLutContent);

        return shaderSource;
}


void TextureSlicePainter::RenderInternal(vtkRenderer* renderer, vtkActor* actor, unsigned long typeflags,
                bool forceCompileOnly)
{
        if (!CanRender(renderer, actor))
        {
                return;
        }

        GLint oldTextureUnit;
        glGetIntegerv(GL_ACTIVE_TEXTURE, &oldTextureUnit);

        int layers = this->mElement.size();
        this->Shader->GetUniformVariables()->SetUniformi("layers", 1, &layers);

        for (unsigned i = 0; i < this->mElement.size(); ++i)
        {
                this->mElement[i].eachRenderInternal(this->Shader);
        }

        this->Shader->Use();

        if (!this->Shader->IsValid())
        {
                vtkErrorMacro(<<" validation of the program failed: "<< this->Shader->GetLastValidateLog());
        }

        this->Superclass::RenderInternal(renderer, actor, typeflags, forceCompileOnly);

        this->Shader->Restore();
        report_gl_error();
        glActiveTexture(oldTextureUnit);
}

bool TextureSlicePainter::CanRender(vtkRenderer*, vtkActor*)
{
        return !this->mElement.empty();
}

bool TextureSlicePainter::LoadRequiredExtension(vtkOpenGLExtensionManager* mgr, QString id)
{
        bool loaded = mgr->LoadSupportedExtension(cstring_cast(id));
        if (!loaded)
                std::cout << "TextureSlicePainter Error: GL extension " + id + " not found" << std::endl;
        return loaded;
}

bool TextureSlicePainter::LoadRequiredExtensions(vtkOpenGLExtensionManager* mgr)
{
        return (LoadRequiredExtension(mgr, "GL_VERSION_2_0")
                        && LoadRequiredExtension(mgr, "GL_VERSION_1_5")
                        && LoadRequiredExtension(mgr, "GL_ARB_vertex_buffer_object"));
}

void TextureSlicePainter::SetVolumeBuffer(int index, GPUImageDataBufferPtr buffer)
{
        this->safeIndex(index).SetBuffer(buffer);
}

void TextureSlicePainter::SetLutBuffer(int index, GPUImageLutBufferPtr buffer)
{
        this->safeIndex(index).SetBuffer(buffer);
}

void TextureSlicePainter::SetColorAttribute(int index, float window, float level, float llr,float alpha)
{
        this->safeIndex(index).SetColorAttribute(window, level, llr, alpha);
}

void TextureSlicePainter::releaseGraphicsResources(int index)
{
}

void TextureSlicePainter::PrintSelf(ostream& os, vtkIndent indent)
{
}

SingleVolumePainterHelper& TextureSlicePainter::safeIndex(int index)
{
        if ((int)mElement.size() <= index)
        {
                mElement.resize(index+1);
                mElement[index] = SingleVolumePainterHelper(index);
        }
        return mElement[index];
}

void TextureSlicePainter::buildProgram(QString shaderSource, vtkOpenGLRenderWindow* renderWindow)
{
        vtkShaderProgram2Ptr pgm = vtkShaderProgram2Ptr::New();
        pgm->SetContext(renderWindow);

        vtkShader2Ptr s2 = vtkShader2Ptr::New();
        s2->SetType(VTK_SHADER_TYPE_FRAGMENT);
        s2->SetSourceCode(cstring_cast(shaderSource));
        s2->SetContext(pgm->GetContext());
        pgm->GetShaders()->AddItem(s2);
        report_gl_error();
        pgm->Build();

        if (pgm->GetLastBuildStatus() != VTK_SHADER_PROGRAM2_LINK_SUCCEEDED)
        {
                vtkErrorMacro("Pass Two failed.");
                abort();
        }

        this->Shader = pgm;
}

void TextureSlicePainter::ClearGraphicsResources()
{
        if (this->Shader != 0)
        {
                this->Shader->ReleaseGraphicsResources();
                this->Shader = 0;
        }
}


//---------------------------------------------------------
}//end namespace
//---------------------------------------------------------

#endif //CX_VTK_OPENGL2
//#endif //WIN32