Initial commit.

Framework/external/embree/tutorials/common/lights/light.h

@@ -0,0 +1,67 @@
+// Copyright 2009-2021 Intel Corporation
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include "../device_default.h"
+#include "../core/differential_geometry.h"
+
+namespace embree {
+
+struct Light;
+
+enum TutorialLightType
+{
+  LIGHT_AMBIENT,
+  LIGHT_POINT,
+  LIGHT_DIRECTIONAL,
+  LIGHT_SPOT,
+  LIGHT_DISTANT,
+  LIGHT_TRIANGLE,
+  LIGHT_QUAD,
+};
+
+struct Light_SampleRes
+{
+  Vec3fa weight;  //!< radiance that arrives at the given point divided by pdf
+  Vec3fa dir;     //!< direction towards the light source
+  float dist;    //!< largest valid t_far value for a shadow ray
+  float pdf;     //!< probability density that this sample was taken
+};
+
+//! compute the weighted radiance at a point caused by a sample on the light source
+// by convention, giving (0, 0) as "random" numbers should sample the "center"
+// of the light source (used by the raytracing renderers such as the OBJ renderer)
+typedef Light_SampleRes (*Light_SampleFunc)(const Light* self,
+                                            const DifferentialGeometry& dg, /*! point to generate the sample for >*/
+                                            const Vec2f& s);                /*! random numbers to generate the sample >*/
+
+
+struct Light_EvalRes
+{
+  Vec3fa value;     //!< radiance that arrives at the given point (not weighted by pdf)
+  float dist;
+  float pdf;       //!< probability density that the direction would have been sampled
+};
+
+//! compute the radiance, distance and pdf caused by the light source (pointed to by the given direction)
+typedef Light_EvalRes (*Light_EvalFunc)(const Light* self,
+                                        const DifferentialGeometry& dg, /*! point to evaluate illumination for >*/
+                                        const Vec3fa& dir);              /*! direction towards the light source >*/
+
+
+struct Light
+{
+  //Light_SampleFunc sample;
+  //Light_EvalFunc eval;
+  TutorialLightType type;
+};
+
+SYCL_EXTERNAL Light_EvalRes Light_eval(const Light* self, const DifferentialGeometry& dg, const Vec3fa& dir);
+
+inline void Light_Constructor(Light* self)
+{
+  //self->eval = GET_FUNCTION_POINTER(Light_eval);
+}
+
+} // namespace embree