Cleanup: fix various Cycles build warnings with non-default options

* Float/double promotion warnings were mainly meant for avoiding slow
  operatiosn in the kernel. Limit it to that to avoid hard to fix warnings
  in Hydra.
* Const warnings in Hydra iterators.
* Unused variable warnings when building without glog.
* Wrong camera enum comparisons in assert.
* PASS_UNUSED is not a pass type, only for pass offsets.

intern/cycles/CMakeLists.txt

@@ -323,11 +323,7 @@ endif()
 
 # Warnings
 if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_C_COMPILER_ID MATCHES "Clang")
-  ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS _has_cxxflag_float_conversion "-Werror=float-conversion")
-  ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS _has_cxxflag_double_promotion "-Werror=double-promotion")
   ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS _has_no_error_unused_macros "-Wno-error=unused-macros")
-  unset(_has_cxxflag_float_conversion)
-  unset(_has_cxxflag_double_promotion)
   unset(_has_no_error_unused_macros)
 endif()
 

intern/cycles/hydra/camera.cpp

@@ -281,9 +281,12 @@ void HdCyclesCamera::ApplyCameraSettings(HdRenderParam *renderParam,
   auto data = dataUnconformedWindow;
   CameraUtilConformWindow(&data, windowPolicy, width / height);
 
-  static_assert(GfCamera::Perspective == CAMERA_PERSPECTIVE &&
-                GfCamera::Orthographic == CAMERA_ORTHOGRAPHIC);
-  cam->set_camera_type(static_cast<CameraType>(data.GetProjection()));
+  if (data.GetProjection() == GfCamera::Orthographic) {
+    cam->set_camera_type(CAMERA_ORTHOGRAPHIC);
+  }
+  else {
+    cam->set_camera_type(CAMERA_PERSPECTIVE);
+  }
 
   const float metersPerUnit = static_cast<HdCyclesSession *>(renderParam)->GetStageMetersPerUnit();
 

intern/cycles/hydra/material.cpp

@@ -266,7 +266,7 @@ void HdCyclesMaterial::UpdateParameters(NodeDesc &nodeDesc,
                                         const std::map<TfToken, VtValue> &parameters,
                                         const SdfPath &nodePath)
 {
-  for (const std::pair<TfToken, VtValue> &param : parameters) {
+  for (const auto &param : parameters) {
     VtValue value = param.second;
 
     // See if the parameter name is in USDPreviewSurface terms, and needs to be converted
@@ -313,7 +313,7 @@ void HdCyclesMaterial::UpdateParameters(const HdMaterialNetwork &network)
 
 void HdCyclesMaterial::UpdateParameters(const HdMaterialNetwork2 &network)
 {
-  for (const std::pair<SdfPath, HdMaterialNode2> &nodeEntry : network.nodes) {
+  for (const auto &nodeEntry : network.nodes) {
     const SdfPath &nodePath = nodeEntry.first;
 
     const auto nodeIt = _nodes.find(nodePath);
@@ -331,8 +331,7 @@ void HdCyclesMaterial::UpdateConnections(NodeDesc &nodeDesc,
                                          const SdfPath &nodePath,
                                          ShaderGraph *shaderGraph)
 {
-  for (const std::pair<TfToken, std::vector<HdMaterialConnection2>> &connection :
-       matNode.inputConnections) {
+  for (const auto &connection : matNode.inputConnections) {
     const TfToken &dstSocketName = connection.first;
 
     const UsdToCyclesMapping *inputMapping = nodeDesc.mapping;
@@ -418,7 +417,7 @@ void HdCyclesMaterial::PopulateShaderGraph(const HdMaterialNetwork2 &networkMap)
   auto graph = new ShaderGraph();
 
   // Iterate all the nodes first and build a complete but unconnected graph with parameters set
-  for (const std::pair<SdfPath, HdMaterialNode2> &nodeEntry : networkMap.nodes) {
+  for (const auto &nodeEntry : networkMap.nodes) {
     NodeDesc nodeDesc = {};
     const SdfPath &nodePath = nodeEntry.first;
 
@@ -465,7 +464,7 @@ void HdCyclesMaterial::PopulateShaderGraph(const HdMaterialNetwork2 &networkMap)
 
   // Now that all nodes have been constructed, iterate the network again and build up any
   // connections between nodes
-  for (const std::pair<SdfPath, HdMaterialNode2> &nodeEntry : networkMap.nodes) {
+  for (const auto &nodeEntry : networkMap.nodes) {
     const SdfPath &nodePath = nodeEntry.first;
 
     const auto nodeIt = _nodes.find(nodePath);
@@ -478,7 +477,7 @@ void HdCyclesMaterial::PopulateShaderGraph(const HdMaterialNetwork2 &networkMap)
   }
 
   // Finally connect the terminals to the graph output (Surface, Volume, Displacement)
-  for (const std::pair<TfToken, HdMaterialConnection2> &terminalEntry : networkMap.terminals) {
+  for (const auto &terminalEntry : networkMap.terminals) {
     const TfToken &terminalName = terminalEntry.first;
     const HdMaterialConnection2 &connection = terminalEntry.second;
 

intern/cycles/integrator/path_trace.cpp

@@ -647,8 +647,6 @@ void PathTrace::update_display(const RenderWork &render_work)
 
 void PathTrace::rebalance(const RenderWork &render_work)
 {
-  static const int kLogLevel = 3;
-
   if (!render_work.rebalance) {
     return;
   }
@@ -656,33 +654,33 @@ void PathTrace::rebalance(const RenderWork &render_work)
   const int num_works = path_trace_works_.size();
 
   if (num_works == 1) {
-    VLOG(kLogLevel) << "Ignoring rebalance work due to single device render.";
+    VLOG(3) << "Ignoring rebalance work due to single device render.";
     return;
   }
 
   const double start_time = time_dt();
 
-  if (VLOG_IS_ON(kLogLevel)) {
-    VLOG(kLogLevel) << "Perform rebalance work.";
-    VLOG(kLogLevel) << "Per-device path tracing time (seconds):";
+  if (VLOG_IS_ON(3)) {
+    VLOG(3) << "Perform rebalance work.";
+    VLOG(3) << "Per-device path tracing time (seconds):";
     for (int i = 0; i < num_works; ++i) {
-      VLOG(kLogLevel) << path_trace_works_[i]->get_device()->info.description << ": "
-                      << work_balance_infos_[i].time_spent;
+      VLOG(3) << path_trace_works_[i]->get_device()->info.description << ": "
+              << work_balance_infos_[i].time_spent;
     }
   }
 
   const bool did_rebalance = work_balance_do_rebalance(work_balance_infos_);
 
-  if (VLOG_IS_ON(kLogLevel)) {
-    VLOG(kLogLevel) << "Calculated per-device weights for works:";
+  if (VLOG_IS_ON(3)) {
+    VLOG(3) << "Calculated per-device weights for works:";
     for (int i = 0; i < num_works; ++i) {
-      VLOG(kLogLevel) << path_trace_works_[i]->get_device()->info.description << ": "
-                      << work_balance_infos_[i].weight;
+      VLOG(3) << path_trace_works_[i]->get_device()->info.description << ": "
+              << work_balance_infos_[i].weight;
     }
   }
 
   if (!did_rebalance) {
-    VLOG(kLogLevel) << "Balance in path trace works did not change.";
+    VLOG(3) << "Balance in path trace works did not change.";
     render_scheduler_.report_rebalance_time(render_work, time_dt() - start_time, false);
     return;
   }

intern/cycles/kernel/CMakeLists.txt

@@ -733,6 +733,14 @@ if(CXX_HAS_AVX2)
   set_source_files_properties(device/cpu/kernel_avx2.cpp PROPERTIES COMPILE_FLAGS "${CYCLES_AVX2_KERNEL_FLAGS}")
 endif()
 
+# Warnings to avoid using doubles in the kernel.
+if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_C_COMPILER_ID MATCHES "Clang")
+  ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS _has_cxxflag_float_conversion "-Werror=float-conversion")
+  ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS _has_cxxflag_double_promotion "-Werror=double-promotion")
+  unset(_has_cxxflag_float_conversion)
+  unset(_has_cxxflag_double_promotion)
+endif()
+
 cycles_add_library(cycles_kernel "${LIB}"
   ${SRC_KERNEL_DEVICE_CPU}
   ${SRC_KERNEL_DEVICE_CUDA}

intern/cycles/session/buffers.cpp

@@ -167,7 +167,7 @@ void BufferParams::reset_pass_offset()
 
 int BufferParams::get_pass_offset(PassType pass_type, PassMode mode) const
 {
-  if (pass_type == PASS_NONE || pass_type == PASS_UNUSED) {
+  if (pass_type == PASS_NONE) {
     return PASS_UNUSED;
   }