Initial commit.

Framework/lights/light.h

@@ -0,0 +1,58 @@
+// Copyright 2009-2021 Intel Corporation
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+#include <math/vec.h>
+// #include "helper.hpp"
+
+struct Sample;
+
+namespace embree {
+    enum LightType {
+        LIGHT_AMBIENT,
+        LIGHT_POINT,
+        LIGHT_DIRECTIONAL,
+        LIGHT_SPOT,
+        LIGHT_DISTANT,
+        LIGHT_TRIANGLE,
+        LIGHT_QUAD,
+    };
+
+    struct Light {
+        //Light_SampleFunc sample;
+        //Light_EvalFunc eval;
+        LightType type;
+    };
+
+    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 Sample& sp, /*! point to evaluate illumination for >*/
+                                            const Vec3fa& dir); /*! direction towards the light source >*/
+
+    Light_EvalRes Light_eval(const Light* self, const Sample& sp, const Vec3fa& dir);
+
+    inline void Light_Constructor(Light* self) {
+        //self->eval = GET_FUNCTION_POINTER(Light_eval);
+    }
+
+
+    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 Sample& sp, /*! point to generate the sample for >*/
+                                                const Vec2f& s); /*! random numbers to generate the sample >*/
+} // namespace embree