Toshihiro Shimizu 890ddd
Toshihiro Shimizu 890ddd
Toshihiro Shimizu 890ddd
// Glew include
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#include <gl glew.h=""></gl>
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// TnzCore includes
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#include "tgl.h"
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// Qt includes
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#include <qcoreapplication></qcoreapplication>
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#include <qthread></qthread>
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#include <qdatetime></qdatetime>
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#include <qglpixelbuffer></qglpixelbuffer>
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#include <qglframebufferobject></qglframebufferobject>
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#include <qglshaderprogram></qglshaderprogram>
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// STD includes
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#include <map></map>
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#include <memory></memory>
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#include "stdfx/shadingcontext.h"
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//*****************************************************************
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//    Local Namespace stuff
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//*****************************************************************
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namespace {
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typedef std::unique_ptr<qglpixelbuffer> QGLPixelBufferP;</qglpixelbuffer>
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typedef std::unique_ptr<qglframebufferobject> QGLFramebufferObjectP;</qglframebufferobject>
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typedef std::unique_ptr<qglshaderprogram> QGLShaderProgramP;</qglshaderprogram>
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struct CompiledShader {
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  QGLShaderProgramP m_program;
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  QDateTime m_lastModified;
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public:
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  CompiledShader() {}
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  CompiledShader(const CompiledShader &) { assert(!m_program.get()); }
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};
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}  // namespace
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//*****************************************************************
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//    ShadingContext::Imp  definition
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//*****************************************************************
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struct ShadingContext::Imp {
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  QGLPixelBufferP m_pixelBuffer;  //!< OpenGL context.
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  QGLFramebufferObjectP m_fbo;    //!< Output buffer.
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  std::map
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           CompiledShader>
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      m_shaderPrograms;  //!< Shader Programs stored in the context.
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                         //!  \warning   Values have \p unique_ptr members.
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public:
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  Imp();
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  static QGLFormat format();
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  void initMatrix(int lx, int ly);
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private:
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  // Not copyable
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  Imp(const Imp &);
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  Imp &operator=(const Imp &);
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};
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//--------------------------------------------------------
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ShadingContext::Imp::Imp()
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    : m_pixelBuffer(new QGLPixelBuffer(1, 1, format())) {}
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//--------------------------------------------------------
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QGLFormat ShadingContext::Imp::format() {
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  QGLFormat fmt;
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#ifdef MACOSX
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  fmt.setVersion(3, 2);
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  fmt.setProfile(QGLFormat::CompatibilityProfile);
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#endif
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  return fmt;
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}
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//--------------------------------------------------------
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void ShadingContext::Imp::initMatrix(int lx, int ly) {
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  glViewport(0, 0, lx, ly);
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  glMatrixMode(GL_PROJECTION);
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  glLoadIdentity();
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  gluOrtho2D(0, lx, 0, ly);
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  glMatrixMode(GL_MODELVIEW);
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  glLoadIdentity();
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}
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//*****************************************************************
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//    ShadingContext  implementation
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//*****************************************************************
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ShadingContext::ShadingContext() : m_imp(new Imp) {
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  makeCurrent();
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  glewExperimental = GL_TRUE;
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  glewInit();
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  doneCurrent();
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}
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//--------------------------------------------------------
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ShadingContext::~ShadingContext() {}
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//--------------------------------------------------------
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ShadingContext::Support ShadingContext::support() {
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  return !QGLPixelBuffer::hasOpenGLPbuffers()
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             ? NO_PIXEL_BUFFER
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             : !QGLShaderProgram::hasOpenGLShaderPrograms() ? NO_SHADERS : OK;
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}
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//--------------------------------------------------------
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bool ShadingContext::isValid() const { return m_imp->m_pixelBuffer->isValid(); }
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//--------------------------------------------------------
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/*
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QGLFormat ShadingContext::defaultFormat(int channelsSize)
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{
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  QGL::FormatOptions opts =
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    QGL::SingleBuffer     |
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    QGL::NoAccumBuffer    |
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    QGL::NoDepthBuffer    |                           // I guess it could be
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necessary to let at least
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    QGL::NoOverlay        |                           // the depth buffer
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enabled... Fragment shaders could
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    QGL::NoSampleBuffers  |                           // use it...
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    QGL::NoStencilBuffer  |
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    QGL::NoStereoBuffers;
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  QGLFormat fmt(opts);
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  fmt.setDirectRendering(true);                       // Just to be explicit -
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USE HARDWARE ACCELERATION
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  fmt.setRedBufferSize(channelsSize);
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  fmt.setGreenBufferSize(channelsSize);
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  fmt.setBlueBufferSize(channelsSize);
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  fmt.setAlphaBufferSize(channelsSize);
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  // TODO: 64-bit mode should be settable here
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  return fmt;
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}
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*/
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//--------------------------------------------------------
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void ShadingContext::makeCurrent() { m_imp->m_pixelBuffer->makeCurrent(); }
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//--------------------------------------------------------
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void ShadingContext::doneCurrent() { m_imp->m_pixelBuffer->doneCurrent(); }
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//--------------------------------------------------------
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void ShadingContext::resize(int lx, int ly,
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                            const QGLFramebufferObjectFormat &fmt) {
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  if (m_imp->m_fbo.get() && m_imp->m_fbo->width() == lx &&
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      m_imp->m_fbo->height() == ly && m_imp->m_fbo->format() == fmt)
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    return;
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  if (lx == 0 || ly == 0) {
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    m_imp->m_fbo.reset(0);
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  } else {
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    m_imp->m_fbo.reset(new QGLFramebufferObject(lx, ly, fmt));
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    assert(m_imp->m_fbo->isValid());
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    m_imp->m_fbo->bind();
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  }
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}
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//--------------------------------------------------------
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QGLFramebufferObjectFormat ShadingContext::format() const {
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  QGLFramebufferObject *fbo = m_imp->m_fbo.get();
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  return fbo ? m_imp->m_fbo->format() : QGLFramebufferObjectFormat();
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}
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//--------------------------------------------------------
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TDimension ShadingContext::size() const {
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  QGLFramebufferObject *fbo = m_imp->m_fbo.get();
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  return fbo ? TDimension(fbo->width(), fbo->height()) : TDimension();
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}
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//--------------------------------------------------------
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void ShadingContext::addShaderProgram(const QString &shaderName,
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                                      QGLShaderProgram *program) {
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  std::map<qstring, compiledshader="">::iterator st =</qstring,>
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      m_imp->m_shaderPrograms
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          .insert(std::make_pair(shaderName, CompiledShader()))
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          .first;
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  st->second.m_program.reset(program);
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}
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//--------------------------------------------------------
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void ShadingContext::addShaderProgram(const QString &shaderName,
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                                      QGLShaderProgram *program,
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                                      const QDateTime &lastModified) {
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  std::map<qstring, compiledshader="">::iterator st =</qstring,>
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      m_imp->m_shaderPrograms
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          .insert(std::make_pair(shaderName, CompiledShader()))
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          .first;
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  st->second.m_program.reset(program);
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  st->second.m_lastModified = lastModified;
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}
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//--------------------------------------------------------
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bool ShadingContext::removeShaderProgram(const QString &shaderName) {
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  return (m_imp->m_shaderPrograms.erase(shaderName) > 0);
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}
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//--------------------------------------------------------
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QGLShaderProgram *ShadingContext::shaderProgram(
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    const QString &shaderName) const {
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  std::map<qstring, compiledshader="">::iterator st =</qstring,>
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      m_imp->m_shaderPrograms.find(shaderName);
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  return (st != m_imp->m_shaderPrograms.end()) ? st->second.m_program.get() : 0;
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}
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//--------------------------------------------------------
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QDateTime ShadingContext::lastModified(const QString &shaderName) const {
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  std::map<qstring, compiledshader="">::iterator st =</qstring,>
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      m_imp->m_shaderPrograms.find(shaderName);
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  return (st != m_imp->m_shaderPrograms.end()) ? st->second.m_lastModified
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                                               : QDateTime();
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}
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//--------------------------------------------------------
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std::pair<qglshaderprogram *,="" qdatetime=""> ShadingContext::shaderData(</qglshaderprogram>
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    const QString &shaderName) const {
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  std::map<qstring, compiledshader="">::iterator st =</qstring,>
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      m_imp->m_shaderPrograms.find(shaderName);
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  return (st != m_imp->m_shaderPrograms.end())
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             ? std::make_pair(st->second.m_program.get(),
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                              st->second.m_lastModified)
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             : std::make_pair((QGLShaderProgram *)0, QDateTime());
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}
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//--------------------------------------------------------
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GLuint ShadingContext::loadTexture(const TRasterP &src, GLuint texUnit) {
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  glActiveTexture(GL_TEXTURE0 + texUnit);
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  GLuint texId;
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  glGenTextures(1, &texId);
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  glBindTexture(GL_TEXTURE_2D, texId);
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  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,
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                  GL_CLAMP);  // These must be used on a bound texture,
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  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,
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                  GL_CLAMP);  // and are remembered in the OpenGL context.
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  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
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                  GL_NEAREST);  // They can be set here, no need for
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  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
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                  GL_NEAREST);  // the user to do it.
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  glPixelStorei(GL_UNPACK_ROW_LENGTH, src->getWrap());
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  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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  GLenum chanType = TRaster32P(src) ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
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  glTexImage2D(GL_TEXTURE_2D,
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               0,             // one level only
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               GL_RGBA,       // pixel channels count
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               src->getLx(),  // width
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               src->getLy(),  // height
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               0,             // border size
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               TGL_FMT,       // pixel format
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               chanType,      // channel data type
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               (GLvoid *)src->getRawData());
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  assert(glGetError() == GL_NO_ERROR);
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  return texId;
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}
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//----------------------------------------------------------------------
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void ShadingContext::unloadTexture(GLuint texId) {
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  glDeleteTextures(1, &texId);
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}
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//--------------------------------------------------------
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void ShadingContext::draw(const TRasterP &dst) {
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  assert("ShadingContext::resize() must be invoked at least once before this" &&
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         m_imp->m_fbo.get());
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  int lx = dst->getLx(),
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      ly = dst->getLy();  // NOTE: We're not using m_imp->m_fbo's size, since
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                          // it could be possibly greater than the required
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                          // destination surface.
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  m_imp->initMatrix(lx, ly);  // This call sets the OpenGL viewport to this
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                              // size - and matches (1, 1) to dst's (lx, ly)
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  {
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    glBegin(GL_QUADS);
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    glVertex2f(0.0, 0.0);
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    glVertex2f(lx, 0.0);
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    glVertex2f(lx, ly);
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    glVertex2f(0.0, ly);
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    glEnd();
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  }
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  glPixelStorei(GL_PACK_ROW_LENGTH, dst->getWrap());
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  // Read the fbo to dst
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  if (TRaster32P ras32 = dst)
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    glReadPixels(0, 0, lx, ly, GL_BGRA_EXT, GL_UNSIGNED_BYTE,
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                 dst->getRawData());
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  else {
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    assert(TRaster64P(dst));
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    glReadPixels(0, 0, lx, ly, GL_BGRA_EXT, GL_UNSIGNED_SHORT,
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                 dst->getRawData());
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  }
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  assert(glGetError() == GL_NO_ERROR);
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}
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//--------------------------------------------------------
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void ShadingContext::transformFeedback(int varyingsCount,
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                                       const GLsizeiptr *varyingSizes,
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                                       GLvoid **bufs) {
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  // Generate buffer objects
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  std::vector<gluint> bufferObjectNames(varyingsCount, 0);</gluint>
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  glGenBuffers(varyingsCount, &bufferObjectNames[0]);
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  for (int v = 0; v != varyingsCount; ++v) {
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    glBindBuffer(GL_ARRAY_BUFFER, bufferObjectNames[v]);
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    glBufferData(GL_ARRAY_BUFFER, varyingSizes[v], bufs[v], GL_STATIC_READ);
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    glBindBuffer(GL_ARRAY_BUFFER, 0);
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    glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, v, bufferObjectNames[v]);
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  }
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  // Draw
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  GLuint Query = 0;
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  glGenQueries(1, &Query);
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  {
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    // Disable rasterization, vertices processing only!
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    glEnable(GL_RASTERIZER_DISCARD);
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    glBeginQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN, Query);
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    glBeginTransformFeedback(GL_POINTS);
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    glBegin(GL_POINTS);
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    glVertex2f(0.0f, 0.0f);
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    glEnd();
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    glEndTransformFeedback();
Toshihiro Shimizu 890ddd
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    glEndQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN);
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    glDisable(GL_RASTERIZER_DISCARD);
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  }
Toshihiro Shimizu 890ddd
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  GLint count = 0;
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  glGetQueryObjectiv(Query, GL_QUERY_RESULT, &count);
Toshihiro Shimizu 890ddd
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  glDeleteQueries(1, &Query);
Toshihiro Shimizu 890ddd
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  // Retrieve transformed data
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  for (int v = 0; v != varyingsCount; ++v) {
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    glBindBuffer(GL_ARRAY_BUFFER, bufferObjectNames[v]);
Shinya Kitaoka 120a6e
    glGetBufferSubData(GL_ARRAY_BUFFER, 0, varyingSizes[v], bufs[v]);
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  }
Toshihiro Shimizu 890ddd
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  glBindBuffer(GL_ARRAY_BUFFER, 0);
Toshihiro Shimizu 890ddd
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  // Delete buffer objects
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  glDeleteBuffers(varyingsCount, &bufferObjectNames[0]);
Toshihiro Shimizu 890ddd
}