refractive material support contd.

betterRenderer/mashadercompiler/src/shader_compiler.cpp

@@ -274,6 +274,11 @@ bool MaShaderCompiler::CompileMaterial(YAML::Node &dest, const YAML::Node &src,
     local_definitions.insert(local_definitions.end(), definitions.begin(),
                              definitions.end());
 
+    if (pass == MaterialRenderPass::Forward &&
+        TemplateOverride("refraction", src, templates).as<bool>(false)) {
+      local_definitions.emplace_back(L"REFRACTION", L"1");
+    }
+
     auto blob = CompileShaderToBlob(file_name, ToWide(entry_name),
                                     local_definitions, target, platform);
 

betterRenderer/renderer/include/nvrenderer/nvrenderer.h

@@ -504,6 +504,7 @@ class NvRenderer : public gfx_renderer, public MaResourceRegistry {
       bool disable_mip_bias = false;
       texture_handle m_default_texture;
     };
+    bool m_enable_refraction = false;
     nvrhi::static_vector<TextureBinding, 8> m_texture_bindings;
     std::array<nvrhi::GraphicsPipelineHandle, Constants::NumMaterialPipelines()>
         m_pipelines;
@@ -699,7 +700,7 @@ class NvRenderer : public gfx_renderer, public MaResourceRegistry {
 
   bool BindMaterial(material_handle handle, DrawType draw_type,
                     const RenderPass &pass, nvrhi::GraphicsState &gfx_state,
-                    float &alpha_threshold);
+                    float &alpha_threshold, bool *out_is_refractive = nullptr);
 
   bool BindLineMaterial(DrawType draw_type, const RenderPass &pass,
                         nvrhi::GraphicsState &gfx_state);

betterRenderer/renderer/source/gbufferblitpass.cpp

@@ -192,8 +192,7 @@ void GbufferBlitPass::UpdateConstants(nvrhi::ICommandList* command_list,
 
   const auto& daylight = Global.DayLight;
 
-  m_sky->CalcLighting(constants.m_light_dir,
-                      constants.m_light_color);
+  m_sky->CalcLighting(constants.m_light_dir, constants.m_light_color);
   constants.m_altitude = Global.pCamera.Pos.y;
   constants.m_time = Timer::GetTime();
   constants.m_vertical_fov =
@@ -201,7 +200,8 @@ void GbufferBlitPass::UpdateConstants(nvrhi::ICommandList* command_list,
 
   {
     float percipitation_intensity = glm::saturate(Global.Overcast - 1.);
-    constants.m_rain_params.x = percipitation_intensity;  // % amount of droplets
+    constants.m_rain_params.x =
+        percipitation_intensity;  // % amount of droplets
     constants.m_rain_params.y =
         glm::mix(15., 1., percipitation_intensity);  // Regeneration time
     static glm::vec4 wiper_timer_out;
@@ -241,6 +241,13 @@ void GbufferBlitPass::UpdateConstants(nvrhi::ICommandList* command_list,
   command_list->writeBuffer(m_draw_constants, &constants, sizeof(constants));
 }
 
+void GbufferBlitPass::UpdateSceneColorForRefraction(
+    nvrhi::ICommandList* command_list) const {
+  command_list->copyTexture(
+      m_output_copy, nvrhi::TextureSlice().resolve(m_output_copy->getDesc()),
+      m_output, nvrhi::TextureSlice().resolve(m_output->getDesc()));
+}
+
 void GbufferBlitPass::Render(nvrhi::ICommandList* command_list,
                              glm::dmat4& view, const glm::dmat4& projection) {
   UpdateConstants(command_list, view, projection);
@@ -249,10 +256,6 @@ void GbufferBlitPass::Render(nvrhi::ICommandList* command_list,
       m_scene_depth, nvrhi::TextureSlice().resolve(m_scene_depth->getDesc()),
       m_gbuffer->m_gbuffer_depth,
       nvrhi::TextureSlice().resolve(m_scene_depth->getDesc()));
-  command_list->copyTexture(
-      m_output_copy, nvrhi::TextureSlice().resolve(m_output_copy->getDesc()),
-      m_output,
-      nvrhi::TextureSlice().resolve(m_output->getDesc()));
 }
 
 void GbufferBlitPass::Render(nvrhi::ICommandList* command_list) {

betterRenderer/renderer/source/gbufferblitpass.h

@@ -18,6 +18,8 @@ struct GbufferBlitPass : public FullScreenPass, public MaResourceRegistry {
   void UpdateConstants(nvrhi::ICommandList* command_list, glm::dmat4& view,
                        const glm::dmat4& projection);
 
+  void UpdateSceneColorForRefraction(nvrhi::ICommandList *command_list) const;
+
   void Render(nvrhi::ICommandList* command_list, glm::dmat4& view,
               const glm::dmat4& projection);
   virtual void Render(nvrhi::ICommandList* command_list) override;

betterRenderer/renderer/source/nvmaterial.cpp

@@ -109,6 +109,7 @@ void NvRenderer::MaterialTemplate::Init(const YAML::Node &conf) {
   MaResourceMapping sampler_mapping_shadow{};
   m_pipelines.fill(nullptr);
   m_masked_shadow_texture = conf["masked_shadow_texture"].as<std::string>();
+  m_enable_refraction = conf["refraction"].as<bool>(false);
   for (const auto it : conf["textures"]) {
     auto index = it.second["binding"].as<int>();
     m_texture_bindings.resize(

betterRenderer/renderer/source/nvrenderer.cpp

@@ -1584,13 +1584,17 @@ void NvRenderer::BindConstants(const RenderPass &pass,
 bool NvRenderer::BindMaterial(material_handle handle, DrawType draw_type,
                               const RenderPass &pass,
                               nvrhi::GraphicsState &gfx_state,
-                              float &alpha_threshold) {
+                              float &alpha_threshold, bool *out_is_refractive) {
   if (pass.m_type == RenderPassType::RendererWarmUp) return true;
   if (!handle || handle > m_material_cache.size()) {
     return false;
   }
   MaterialCache &cache = m_material_cache[handle - 1];
 
+  if(out_is_refractive) {
+    *out_is_refractive = cache.m_template->m_enable_refraction;
+  }
+
   if (!cache.ShouldRenderInPass(pass)) return false;
 
   auto pipeline_index = Constants::GetPipelineIndex(pass.m_type, draw_type);

betterRenderer/renderer/source/track_batching.cpp

@@ -1,4 +1,5 @@
 #include "config.h"
+#include "gbufferblitpass.h"
 #include "motioncache.h"
 #include "nvrenderer/nvrenderer.h"
 #include "nvrendererbackend.h"
@@ -1014,18 +1015,23 @@ void NvRenderer::Render(const Renderable& renderable, const RenderPass& pass,
     nvrhi::GraphicsState gfx_state;
     nvrhi::DrawArguments draw_arguments{};
     bool indexed;
+    bool refractive;
     float alpha_threshold;
     if (!BindGeometry(item.m_geometry, pass, gfx_state, draw_arguments,
                       indexed))
       continue;
     if (!BindMaterial(item.m_material, DrawType::Model, pass, gfx_state,
-                      alpha_threshold))
+                      alpha_threshold, &refractive))
       continue;
 
     BindConstants(pass, gfx_state);
 
     pass.m_command_list_draw->beginMarker(item.m_name.data());
 
+    if(refractive && pass.m_type == RenderPassType::Forward) {
+      m_gbuffer_blit->UpdateSceneColorForRefraction(pass.m_command_list_draw);
+    }
+
     pass.m_command_list_draw->setGraphicsState(gfx_state);
 
     auto transform = item.m_transform;

betterRenderer/shaders/project.manul

@@ -147,6 +147,7 @@ shaders:
           default: system/raindrops_buffer
       masked_shadow_texture: diffuse
       source: ps_windshield_rain
+      refraction: true
   utility:
 # Everything that does not belong to scene graph rendering
 # ImGui shaders

betterRenderer/shaders/ps_windshield_rain.hlsl

@@ -1,5 +1,3 @@
-#define REFRACTION 1
-
 #include "manul/math.hlsli"
 #include "manul/material.hlsli"
 #include "manul/color_transform.hlsli"
@@ -53,7 +51,7 @@ void MaterialPass(inout MaterialData material) {
     material_glass.m_MaterialAlbedoAlpha.xyz = 0.;
     material_glass.m_MaterialNormal = material.m_Normal;
     material_glass.m_MaterialParams.g = .2;
-    float3 normal = CalculateSurfaceNormal(material_glass.m_Position, material_glass.m_Normal, gradient * -.005);
+    float3 normal = CalculateSurfaceNormal(material_glass.m_Position, material_glass.m_Normal, gradient * -.0075);
     material_glass.m_MaterialNormal = normal;
     float cosTheta = saturate(dot(-normalize(material_glass.m_Position), normal));
     material.m_MaterialAlbedoAlpha.a = lerp(.1, FresnelSchlickRoughness(cosTheta, .04, 0.), smoothstep(0., .15, droplet_distance));
@@ -63,7 +61,7 @@ void MaterialPass(inout MaterialData material) {
     float4 glass_lit;
     ApplyMaterialLighting(glass_lit, material_glass, material_glass.m_PixelCoord);
 
-    material.m_MaterialEmission = glass_lit * smoothstep(0., .15, droplet_distance) * saturate(normal_world.y * .5 + .5);
+    material.m_MaterialEmission = glass_lit * smoothstep(0., .15, droplet_distance) * smoothstep(-1., 0., normal_world.y);
 
     material.m_MaterialAlbedoAlpha.xyz = 0.;
     material.m_RefractionOffset = normal.xy * (.005 / (length(material.m_Position) * tan(.5 * g_VerticalFov))) * smoothstep(0., .15, droplet_distance);