GPU/HW: Clear host display texture on interlace switch

src/core/gpu_hw_d3d11.cpp

@@ -824,6 +824,8 @@ void GPU_HW_D3D11::ClearDisplay()
 {
   GPU_HW::ClearDisplay();
 
+  m_host_display->ClearDisplayTexture();
+
   static constexpr std::array<float, 4> clear_color = {0.0f, 0.0f, 0.0f, 1.0f};
   m_context->ClearRenderTargetView(m_display_texture.GetD3DRTV(), clear_color.data());
 }

src/core/gpu_hw_opengl.cpp

@@ -837,6 +837,8 @@ void GPU_HW_OpenGL::ClearDisplay()
 {
   GPU_HW::ClearDisplay();
 
+  m_host_display->ClearDisplayTexture();
+
   m_display_texture.BindFramebuffer(GL_DRAW_FRAMEBUFFER);
   glDisable(GL_SCISSOR_TEST);
   glClearColor(0.0f, 0.0f, 0.0f, 1.0f);

src/core/gpu_hw_vulkan.cpp

@@ -1298,6 +1298,8 @@ void GPU_HW_Vulkan::ClearDisplay()
   GPU_HW::ClearDisplay();
   EndRenderPass();
 
+  m_host_display->ClearDisplayTexture();
+
   VkCommandBuffer cmdbuf = g_vulkan_context->GetCurrentCommandBuffer();
   m_display_texture.TransitionToLayout(cmdbuf, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL);