Function ApplyState

libs/drape/render_state.cpp:286–343

}

void ApplyState(ref_ptr<GraphicsContext> context, ref_ptr<GpuProgram> program, RenderState const & state)
{
  auto const apiVersion = context->GetApiVersion();

  TextureState::ApplyTextures(context, state, program);

  // Apply blending state.
  if (apiVersion == dp::ApiVersion::Metal)
  {
    // For Metal rendering blending state is a part of the pipeline state.
#if defined(OMIM_METAL_AVAILABLE)
    ApplyPipelineStateForMetal(context, program, state.GetBlending().m_isEnabled);
#endif
  }
  else if (apiVersion == dp::ApiVersion::Vulkan)
  {
    ref_ptr<dp::vulkan::VulkanBaseContext> vulkanContext = context;
    vulkanContext->SetProgram(program);
    vulkanContext->SetBlendingEnabled(state.GetBlending().m_isEnabled);
  }
  else
  {
    state.GetBlending().Apply(context, program);
  }

  // Apply depth state.
  context->SetDepthTestEnabled(state.GetDepthTestEnabled());
  if (state.GetDepthTestEnabled())
    context->SetDepthTestFunction(state.GetDepthFunction());
  if (apiVersion == dp::ApiVersion::Metal)
  {
    // For Metal rendering we have to apply depth-stencil state after SetX functions calls.
#if defined(OMIM_METAL_AVAILABLE)
    ApplyDepthStencilStateForMetal(context);
#endif
  }

  if (state.GetDrawAsLine())
  {
    if (apiVersion == dp::ApiVersion::OpenGLES3)
    {
      ASSERT_GREATER_OR_EQUAL(state.GetLineWidth(), 0, ());
      GLFunctions::glLineWidth(static_cast<uint32_t>(state.GetLineWidth()));
    }
    else if (apiVersion == dp::ApiVersion::Metal)
    {
      // Do nothing. Metal does not support line width.
    }
    else if (apiVersion == dp::ApiVersion::Vulkan)
    {
      ASSERT_GREATER_OR_EQUAL(state.GetLineWidth(), 0, ());
      ref_ptr<dp::vulkan::VulkanBaseContext> vulkanContext = context;
      VkCommandBuffer commandBuffer = vulkanContext->GetCurrentRenderingCommandBuffer();
      CHECK(commandBuffer != nullptr, ());
      vkCmdSetLineWidth(commandBuffer, static_cast<float>(state.GetLineWidth()));
    }
  }
}