Method RenderTextInternal

renderdoc/driver/gl/gl_rendertext.cpp:305–580

}

void WrappedOpenGL::RenderTextInternal(float x, float y, const rdcstr &text)
{
  if(text.empty())
    return;

  RDCASSERT(text.size() < FONT_MAX_CHARS);

  ContextData &ctxdata = GetCtxData();

  if(!ctxdata.built || !ctxdata.ready || (ctxdata.Modern() && ctxdata.Program == 0))
    return;

  // if it's reasonably modern context, assume we can use buffers and UBOs
  if(ctxdata.Modern())
  {
    GL.glBindBuffer(eGL_ARRAY_BUFFER, ctxdata.ArrayBuffer);

    size_t len = text.size();

    if((int)len > FONT_MAX_CHARS)
    {
      static bool printedWarning = false;

      // this could be called once a frame, don't want to spam the log
      if(!printedWarning)
      {
        printedWarning = true;
        RDCWARN("log string '%s' is too long", text.c_str(), (int)len);
      }

      len = FONT_MAX_CHARS;
    }

    static const Vec2f basePos[] = {
        Vec2f(0.0, 0.0), Vec2f(1.0, 0.0), Vec2f(0.0, 1.0),
        Vec2f(1.0, 0.0), Vec2f(0.0, 1.0), Vec2f(1.0, 1.0),
    };

    const Vec2f FontScreenAspect(ctxdata.CharAspect / RDCMAX(1.0f, float(ctxdata.initParams.width)),
                                 1.0f / RDCMAX(1.0f, float(ctxdata.initParams.height)));

    float *vertexData = new float[5 * len * 6];

    for(size_t i = 0; i < len; i++)
    {
      for(int ch = 0; ch < 6; ch++)
      {
        Vec2f uv = basePos[ch];

        Vec2f pos = uv;
        pos.x += float(i) + x;
        pos.y += y;

        pos.x *= 2.0f * ctxdata.CharSize * FontScreenAspect.x;
        pos.y *= 2.0f * ctxdata.CharSize * FontScreenAspect.y;

        pos.x -= 1.0f;
        pos.y -= 1.0f;