Method computeStats

Source/Falcor/Scene/Lights/LightCollection.cpp:410–462

    }

    void LightCollection::computeStats(RenderContext* pRenderContext) const
    {
        if (mStatsValid) return;

        // Read back the current data. This is potentially expensive.
        syncCPUData(pRenderContext);

        // Stats on input data.
        MeshLightStats stats;
        stats.meshLightCount = (uint32_t)mMeshLights.size();
        stats.triangleCount = (uint32_t)mMeshLightTriangles.size();

        uint32_t trianglesTotal = 0;
        for (const auto& meshLight : mMeshLights)
        {
            auto pMaterial = mpScene->getMaterial(MaterialID::fromSlang(meshLight.materialID))->toBasicMaterial();
            FALCOR_ASSERT(pMaterial);
            bool isTextured = pMaterial->getEmissiveTexture() != nullptr;

            if (isTextured)
            {
                stats.meshesTextured++;
                stats.trianglesTextured += meshLight.triangleCount;
            }
            trianglesTotal += meshLight.triangleCount;
        }
        FALCOR_ASSERT(trianglesTotal == stats.triangleCount);

        // Stats on pre-processed data.
        for (const auto& tri : mMeshLightTriangles)
        {
            FALCOR_ASSERT(tri.flux >= 0.f);
            if (tri.flux == 0.f)
            {
                stats.trianglesCulled++;
            }
            else
            {
                // TODO: Currently we don't detect uniform radiance for textured lights, so just look at whether the mesh light is textured or not.
                // This code will change when we tag individual triangles as textured vs non-textured.
                auto pMaterial = mpScene->getMaterial(MaterialID::fromSlang(mMeshLights[tri.lightIdx].materialID))->toBasicMaterial();
                FALCOR_ASSERT(pMaterial);
                bool isTextured = pMaterial->getEmissiveTexture() != nullptr;

                if (isTextured) stats.trianglesActiveTextured++;
                else stats.trianglesActiveUniform++;
            }
        }
        stats.trianglesActive = stats.trianglesActiveUniform + stats.trianglesActiveTextured;

        mMeshLightStats = stats;
        mStatsValid = true;
    }

    void LightCollection::buildTriangleList(RenderContext* pRenderContext, const Scene& scene)
    {