GPU/HW: Dynamically size downsampling textures

src/core/gpu_hw.h

@@ -282,14 +282,13 @@ private:
   std::unique_ptr<GPUPipeline> m_copy_pipeline;
 
   std::unique_ptr<GPUTexture> m_downsample_texture;
-  std::unique_ptr<GPUTexture> m_downsample_render_texture;
-  std::unique_ptr<GPUTexture> m_downsample_weight_texture;
   std::unique_ptr<GPUPipeline> m_downsample_first_pass_pipeline;
   std::unique_ptr<GPUPipeline> m_downsample_mid_pass_pipeline;
   std::unique_ptr<GPUPipeline> m_downsample_blur_pass_pipeline;
   std::unique_ptr<GPUPipeline> m_downsample_composite_pass_pipeline;
   std::unique_ptr<GPUSampler> m_downsample_lod_sampler;
   std::unique_ptr<GPUSampler> m_downsample_composite_sampler;
+  u32 m_downsample_scale_or_levels = 0;
 
   // Statistics
   RendererStats m_renderer_stats = {};