Method loadFont

src/backend/opengl/font_impl.cpp:279–342

}

void font_impl::loadFont(const char* const pFile)
{
    CheckGL("Begin font_impl::loadFont");

    /* Check if font is already loaded. If yes, check if current font load
     * request is same as earlier. If so, return from the function, otherwise,
     * cleanup currently used resources and mark accordingly for subsequent
     * font loading.*/
    if (mIsFontLoaded) {
        if (pFile==mTTFfile)
            return;
        else {
            destroyGLResources();
            mIsFontLoaded = false;
        }
    }

    mTTFfile = pFile;
    /* Load different font sizes into font atlas */
    for (size_t s = size_t(MIN_FONT_SIZE); s <= size_t(MAX_FONT_SIZE); ++s) {
        loadAtlasWithGlyphs(s);
    }

    mAtlas->upload();

    /* push each glyphs vertex and texture data into VBO */
    std::vector<float> vdata;

    uint index = 0;

    for (size_t f=0; f<mGlyphLists.size(); ++f)
    {
        auto& list = mGlyphLists[f];

        for (size_t l=0; l<list.size(); ++l)
        {
            Glyph* g = list[l];

            std::vector<float> data(16, 0.0f);
            data[0] = 0.0f; data[1] = float(-g->mAdvanceY+g->mHeight);
            data[2] = g->mS0; data[3] = g->mT1;

            data[4] = 0.0f; data[5] = float(-g->mAdvanceY);
            data[6] = g->mS0; data[7] = g->mT0;

            data[8] = float(g->mWidth); data[9] = float(-g->mAdvanceY+g->mHeight);
            data[10] = g->mS1; data[11] = g->mT1;

            data[12] = float(g->mWidth); data[13] = float(-g->mAdvanceY);
            data[14] = g->mS1; data[15] = g->mT0;

            vdata.insert(vdata.end(), data.begin(), data.end());

            g->mOffset = index;
            index += 4;
        }
    }