Method CoreDrawTriangles

Rendering/ContextOpenGL2/vtkOpenGLContextDevice2D.cxx:1269–1341

}

void vtkOpenGLContextDevice2D::CoreDrawTriangles(
  std::vector<float>& tverts, unsigned char* colors, int numComp)
{
  if (SkipDraw())
  {
    return;
  }

  vtkOpenGLClearErrorMacro();

  float* texCoord = nullptr;
  vtkOpenGLHelper* cbo = nullptr;
  if (this->Brush->GetTexture())
  {
    this->ReadyVTBOProgram();
    cbo = this->VTBO;
    if (!cbo->Program)
    {
      return;
    }
    this->SetTexture(this->Brush->GetTexture(), this->Brush->GetTextureProperties());
    this->Storage->Texture->Render(this->Renderer);
    texCoord = this->Storage->TexCoords(tverts.data(), static_cast<int>(tverts.size() / 2));

    int tunit = vtkOpenGLTexture::SafeDownCast(this->Storage->Texture)->GetTextureUnit();
    cbo->Program->SetUniformi("texture1", tunit);
  }
  else if (colors && numComp > 0)
  {
    this->ReadyVCBOProgram();
    cbo = this->VCBO;
  }
  else
  {
    // Skip transparent elements.
    if (this->Brush->GetColorObject().GetAlpha() == 0)
    {
      return;
    }
    this->ReadyVBOProgram();
    cbo = this->VBO;
  }

  if (!cbo->Program)
  {
    return;
  }

  cbo->Program->SetUniform4uc("vertexColor", this->Brush->GetColor());

  this->BuildVBO(
    cbo, tverts.data(), static_cast<int>(tverts.size() / 2), colors, numComp, texCoord);

  this->SetMatrices(cbo->Program);

  PreDraw(*cbo, GL_TRIANGLES, tverts.size() / 2);

  auto timer = this->RenderWindow->GetRenderTimer();