From 6e2ed1c49b2d2a60386c3081b157b2623dbf6802 Mon Sep 17 00:00:00 2001
From: Hugues Delorme <delorme.hugues@fougue.pro>
Date: Thu, 9 Nov 2023 09:15:11 +0100
Subject: [PATCH] IO_Assimp: WIP3

---
 mayo.pro                           | 16 +++++++++++++++-
 src/io_assimp/io_assimp_reader.cpp | 14 ++++++++++++--
 2 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/mayo.pro b/mayo.pro
index 98bf21e8..1a876640 100644
--- a/mayo.pro
+++ b/mayo.pro
@@ -191,27 +191,41 @@ versionAtLeast(OCC_VERSION_STR, 7.4.0) {
         src/io_occ/io_occ_base_mesh.cpp \
         src/io_occ/io_occ_gltf_reader.cpp \
         src/io_occ/io_occ_obj_reader.cpp
+
+    message(glTF reader disabled because OpenCascade < v7.4)
+    message(OBJ reader disabled because OpenCascade < v7.4)
 }
 
 !versionAtLeast(OCC_VERSION_STR, 7.5.0) {
     SOURCES -= src/io_occ/io_occ_gltf_writer.cpp
+    message(glTF writer disabled because OpenCascade < v7.5)
 }
 
 !versionAtLeast(OCC_VERSION_STR, 7.6.0) {
     SOURCES -= src/io_occ/io_occ_obj_writer.cpp
+    message(OBJ writer disabled because OpenCascade < v7.6)
 }
 # -- VRML support
 LIBS += -lTKVRML
 !versionAtLeast(OCC_VERSION_STR, 7.7.0) {
     SOURCES -= src/io_occ/io_occ_vrml_reader.cpp
+    message(VRML reader disabled because OpenCascade < v7.7)
 }
 
 # assimp
 isEmpty(ASSIMP_INC_DIR) | isEmpty(ASSIMP_LIB_DIR) {
     message(assimp OFF)
 } else {
-    message(assimp ON)
+    !versionAtLeast(OCC_VERSION_STR, 7.5.0) {
+        message(assimp reader disabled because OpenCascade < v7.5)
+    }
+    else {
+        message(assimp ON)
+        ASSIMP_IS_ON = 1
+    }
+}
 
+defined(ASSIMP_IS_ON, var) {
     HEADERS += $$files(src/io_assimp/*.h)
     SOURCES += $$files(src/io_assimp/*.cpp)
 
diff --git a/src/io_assimp/io_assimp_reader.cpp b/src/io_assimp/io_assimp_reader.cpp
index d70fd212..e7d39af4 100644
--- a/src/io_assimp/io_assimp_reader.cpp
+++ b/src/io_assimp/io_assimp_reader.cpp
@@ -59,7 +59,13 @@ aiVector3D aiMatrixScaling(const aiMatrix4x4& trsf)
 
 bool hasScaleFactor(const gp_Trsf& trsf)
 {
-    return (Abs(Abs(trsf.ScaleFactor()) - 1.) > TopLoc_Location::ScalePrec()) || trsf.IsNegative();
+    const double topLocationScalePrec =
+#if OCC_VERSION_HEX >= OCC_VERSION_CHECK(7, 6, 0)
+        TopLoc_Location::ScalePrec();
+#else
+        1.e-14;
+#endif
+    return (Abs(Abs(trsf.ScaleFactor()) - 1.) > topLocationScalePrec) || trsf.IsNegative();
 }
 
 bool hasScaleFactor(const aiVector3D& scaling)
@@ -443,11 +449,15 @@ Handle(XCAFDoc_VisMaterial) AssimpReader::createOccVisMaterial(
     {
         int flag;
         if (material->Get(AI_MATKEY_TWOSIDED, flag) == aiReturn_SUCCESS) {
+#if OCC_VERSION_HEX >= OCC_VERSION_CHECK(7, 6, 0)
             mat->SetFaceCulling(
                 flag ?
                     Graphic3d_TypeOfBackfacingModel_DoubleSided
                      : Graphic3d_TypeOfBackfacingModel_BackCulled
-                );
+            );
+#else
+            mat->SetDoubleSided(flag != 0);
+#endif
         }
     }