Method histogram_impl

src/backend/opengl/histogram_impl.cpp:73–119

}

histogram_impl::histogram_impl(const uint pNBins, const forge::dtype pDataType)
 :  mDataType(pDataType), mGLType(dtype2gl(mDataType)), mNBins(pNBins),
    mProgram(glsl::histogram_vs.c_str(), glsl::histogram_fs.c_str()),
    mYMaxIndex(-1), mNBinsIndex(-1), mMatIndex(-1), mPointIndex(-1),
    mFreqIndex(-1), mColorIndex(-1), mAlphaIndex(-1), mPVCIndex(-1), mPVAIndex(-1),
    mBColorIndex(-1)
{
    CheckGL("Begin histogram_impl::histogram_impl");

    setColor(0.8f, 0.6f, 0.0f, 1.0f);

    mYMaxIndex   = mProgram.getUniformLocation("ymax"     );
    mNBinsIndex  = mProgram.getUniformLocation("nbins"    );
    mMatIndex    = mProgram.getUniformLocation("transform");
    mPVCIndex    = mProgram.getUniformLocation("isPVCOn"  );
    mPVAIndex    = mProgram.getUniformLocation("isPVAOn"  );
    mBColorIndex = mProgram.getUniformLocation("barColor" );
    mPointIndex  = mProgram.getAttributeLocation("point");
    mFreqIndex   = mProgram.getAttributeLocation("freq" );
    mColorIndex  = mProgram.getAttributeLocation("color");
    mAlphaIndex  = mProgram.getAttributeLocation("alpha");

    mVBOSize = mNBins;
    mCBOSize = 3*mVBOSize;
    mABOSize = mNBins;

#define HIST_CREATE_BUFFERS(type)   \
    mVBO = createBuffer<type>(GL_ARRAY_BUFFER, mVBOSize, NULL, GL_DYNAMIC_DRAW);  \
    mCBO = createBuffer<float>(GL_ARRAY_BUFFER, mCBOSize, NULL, GL_DYNAMIC_DRAW); \
    mABO = createBuffer<float>(GL_ARRAY_BUFFER, mABOSize, NULL, GL_DYNAMIC_DRAW); \
    mVBOSize *= sizeof(type);   \
    mCBOSize *= sizeof(float);  \
    mABOSize *= sizeof(float);

    switch(mGLType) {
        case GL_FLOAT          : HIST_CREATE_BUFFERS(float) ; break;
        case GL_INT            : HIST_CREATE_BUFFERS(int)   ; break;
        case GL_UNSIGNED_INT   : HIST_CREATE_BUFFERS(uint)  ; break;
        case GL_SHORT          : HIST_CREATE_BUFFERS(short) ; break;
        case GL_UNSIGNED_SHORT : HIST_CREATE_BUFFERS(ushort); break;
        case GL_UNSIGNED_BYTE  : HIST_CREATE_BUFFERS(float) ; break;
        default: TYPE_ERROR(1, mDataType);
    }
#undef HIST_CREATE_BUFFERS

    CheckGL("End histogram_impl::histogram_impl");
}

histogram_impl::~histogram_impl()
{