add refraction support for materials; two pass rain shader

betterRenderer/renderer/source/windshield_rain.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include "nvrenderer/nvrenderer.h"
+
+struct WindshieldRain {
+  void Init(NvRenderer *in_renderer);
+  void Resize(int width, int height);
+
+  uint32_t width;
+  uint32_t height;
+
+  [[nodiscard]] nvrhi::ITexture *GetTexture() const;
+
+  void Render(NvRenderer::RenderPass const &pass);
+  bool IsRainShader(NvRenderer::MaterialTemplate const *mt) const;
+
+  size_t texture_handle_droplets;
+  size_t texture_handle_wipermask;
+
+  nvrhi::TextureHandle texture_droplets;
+
+  nvrhi::SamplerHandle sampler;
+  nvrhi::SamplerHandle sampler_point;
+
+  void CreatePso(nvrhi::ICommandList *command_list);
+
+  NvRenderer *renderer;
+  nvrhi::FramebufferHandle framebuffer;
+  nvrhi::TextureHandle tex_droplets;
+  nvrhi::TextureHandle tex_depth;
+  nvrhi::TextureHandle tex_depth_temp;
+
+  nvrhi::ShaderHandle ps_rain_anim;
+  nvrhi::ShaderHandle vs_rain_anim;
+  nvrhi::ShaderHandle cs_max_depth;
+
+  nvrhi::BindingSetHandle bindings;
+  nvrhi::BindingSetHandle bindings_max_depth;
+
+  nvrhi::GraphicsPipelineHandle pso_droplets;
+  nvrhi::ComputePipelineHandle pso_max_depth;
+
+  nvrhi::BindingLayoutHandle binding_layout;
+
+  std::unordered_map<size_t, nvrhi::BindingSetHandle> binding_sets_per_material;
+};