Bulk update nvpro-samples 05/17/21

Changing license from BSD-3 to Apache2

ray_tracing_specialization/shaders/raytrace.rchit

@@ -0,0 +1,169 @@
+/*
+ * Copyright (c) 2019-2021, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2019-2021 NVIDIA CORPORATION
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#version 460
+#extension GL_EXT_ray_tracing : require
+#extension GL_EXT_nonuniform_qualifier : enable
+#extension GL_EXT_scalar_block_layout : enable
+#extension GL_GOOGLE_include_directive : enable
+#include "raycommon.glsl"
+#include "wavefront.glsl"
+
+hitAttributeEXT vec2 attribs;
+
+// clang-format off
+layout(location = 0) rayPayloadInEXT hitPayload prd;
+layout(location = 1) rayPayloadEXT bool isShadowed;
+
+layout(binding = 0, set = 0) uniform accelerationStructureEXT topLevelAS;
+layout(binding = 1, set = 1, scalar) buffer MatColorBufferObject { WaveFrontMaterial m[]; } materials[];
+layout(binding = 2, set = 1, scalar) buffer ScnDesc { sceneDesc i[]; } scnDesc;
+layout(binding = 3, set = 1) uniform sampler2D textureSamplers[];
+layout(binding = 4, set = 1)  buffer MatIndexColorBuffer { int i[]; } matIndex[];
+layout(binding = 5, set = 1, scalar) buffer Vertices { Vertex v[]; } vertices[];
+layout(binding = 6, set = 1) buffer Indices { uint i[]; } indices[];
+
+
+layout(constant_id = 0) const int USE_DIFFUSE = 1;
+layout(constant_id = 1) const int USE_SPECULAR = 1;
+layout(constant_id = 2) const int TRACE_SHADOW = 1;
+
+// clang-format on
+
+layout(push_constant) uniform Constants
+{
+  vec4  clearColor;
+  vec3  lightPosition;
+  float lightIntensity;
+  int   lightType;
+  int   specialization;
+}
+pushC;
+
+
+void main()
+{
+  // Object of this instance
+  uint objId = scnDesc.i[gl_InstanceCustomIndexEXT].objId;
+
+  // Indices of the triangle
+  ivec3 ind = ivec3(indices[nonuniformEXT(objId)].i[3 * gl_PrimitiveID + 0],   //
+                    indices[nonuniformEXT(objId)].i[3 * gl_PrimitiveID + 1],   //
+                    indices[nonuniformEXT(objId)].i[3 * gl_PrimitiveID + 2]);  //
+  // Vertex of the triangle
+  Vertex v0 = vertices[nonuniformEXT(objId)].v[ind.x];
+  Vertex v1 = vertices[nonuniformEXT(objId)].v[ind.y];
+  Vertex v2 = vertices[nonuniformEXT(objId)].v[ind.z];
+
+  const vec3 barycentrics = vec3(1.0 - attribs.x - attribs.y, attribs.x, attribs.y);
+
+  // Computing the normal at hit position
+  vec3 normal = v0.nrm * barycentrics.x + v1.nrm * barycentrics.y + v2.nrm * barycentrics.z;
+  // Transforming the normal to world space
+  normal = normalize(vec3(scnDesc.i[gl_InstanceCustomIndexEXT].transfoIT * vec4(normal, 0.0)));
+
+
+  // Computing the coordinates of the hit position
+  vec3 worldPos = v0.pos * barycentrics.x + v1.pos * barycentrics.y + v2.pos * barycentrics.z;
+  // Transforming the position to world space
+  worldPos = vec3(scnDesc.i[gl_InstanceCustomIndexEXT].transfo * vec4(worldPos, 1.0));
+
+  // Vector toward the light
+  vec3  L;
+  float lightIntensity = pushC.lightIntensity;
+  float lightDistance  = 100000.0;
+  // Point light
+  if(pushC.lightType == 0)
+  {
+    vec3 lDir      = pushC.lightPosition - worldPos;
+    lightDistance  = length(lDir);
+    lightIntensity = pushC.lightIntensity / (lightDistance * lightDistance);
+    L              = normalize(lDir);
+  }
+  else  // Directional light
+  {
+    L = normalize(pushC.lightPosition - vec3(0));
+  }
+
+  // Material of the object
+  int               matIdx = matIndex[nonuniformEXT(objId)].i[gl_PrimitiveID];
+  WaveFrontMaterial mat    = materials[nonuniformEXT(objId)].m[matIdx];
+
+
+  // Diffuse
+  vec3 diffuse = vec3(0);
+  if(USE_DIFFUSE == 1)
+  {
+    diffuse = computeDiffuse(mat, L, normal);
+    if(mat.textureId >= 0)
+    {
+      uint txtId    = mat.textureId + scnDesc.i[gl_InstanceCustomIndexEXT].txtOffset;
+      vec2 texCoord = v0.texCoord * barycentrics.x + v1.texCoord * barycentrics.y
+                      + v2.texCoord * barycentrics.z;
+      diffuse *= texture(textureSamplers[nonuniformEXT(txtId)], texCoord).xyz;
+    }
+  }
+
+  vec3  specular    = vec3(0);
+  float attenuation = 1;
+
+  // Tracing shadow ray only if the light is visible from the surface
+  if(dot(normal, L) > 0)
+  {
+    if(TRACE_SHADOW == 1)
+    {
+      float tMin   = 0.001;
+      float tMax   = lightDistance;
+      vec3  origin = gl_WorldRayOriginEXT + gl_WorldRayDirectionEXT * gl_HitTEXT;
+      vec3  rayDir = L;
+      uint  flags  = gl_RayFlagsTerminateOnFirstHitEXT | gl_RayFlagsOpaqueEXT
+                   | gl_RayFlagsSkipClosestHitShaderEXT;
+      isShadowed = true;
+      traceRayEXT(topLevelAS,  // acceleration structure
+                  flags,       // rayFlags
+                  0xFF,        // cullMask
+                  0,           // sbtRecordOffset
+                  0,           // sbtRecordStride
+                  1,           // missIndex
+                  origin,      // ray origin
+                  tMin,        // ray min range
+                  rayDir,      // ray direction
+                  tMax,        // ray max range
+                  1            // payload (location = 1)
+      );
+    }
+    else
+      isShadowed = false;
+
+    if(isShadowed)
+    {
+      attenuation = 0.3;
+    }
+    else
+    {
+      // Specular
+      if(USE_SPECULAR == 1)
+      {
+        specular = computeSpecular(mat, gl_WorldRayDirectionEXT, L, normal);
+      }
+    }
+  }
+
+  prd.hitValue = vec3(lightIntensity * attenuation * (diffuse + specular));
+}