OpenShadingLanguage/0001-Generalize-lookup-of-stdosl.h-in-install-directory-a.patch

From 2e80787bfadd3d02064d72f7d5374d07bc0225cc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20Br=C3=BCns?= <stefan.bruens@rwth-aachen.de>
Date: Sun, 13 Jan 2019 01:50:59 +0100
Subject: [PATCH] Generalize lookup of stdosl.h in install directory, allow
 customization

Currently, shaders are installed in <PREFIX>/shaders, which does not
fit the needs of most Linux distributions, where <PREFIX> is typically
/usr/, and architecture independent data like the shaders should be
installed in e.g. /usr/share/OpenShadingLanguage/shaders/.

Typically, CMAKE_INSTALL_DATADIR is used for this case, but this would
break the current scheme. Introduce an OSL specific option instead,
OSL_INSTALL_SHADERDIR (default ""), which can be used to specify an
absolute or relative path for the shader installation.

Usage (relative to CMAKE_INSTALL_PREFIX):
$> cmake -DCMAKE_INSTALL_PREFIX=/usr/ \
   -DOSL_INSTALL_SHADERDIR=share/OpenShadingLanguage

Same effect, using absolute paths:
$> cmake -DCMAKE_INSTALL_PREFIX=/usr/ \
   -DOSL_INSTALL_SHADERDIR=/usr/share/OpenShadingLanguage

The configured path is added to the stdosl.h path lookup, i.e. for
the example above "/usr/share/OpenShadingLanguage/shaders/stdosl.h".
---
 CMakeLists.txt                          | 9 +++++++++
 src/liboslcomp/CMakeLists.txt           | 2 ++
 src/liboslcomp/oslcomp.cpp              | 9 +++++++++
 src/liboslcomp/oslcomp_shaders_dir.h.in | 7 +++++++
 src/liboslexec/CMakeLists.txt           | 1 +
 src/shaders/CMakeLists.txt              | 2 +-
 src/shaders/MaterialX/CMakeLists.txt    | 2 +-
 7 files changed, 30 insertions(+), 2 deletions(-)
 create mode 100644 src/liboslcomp/oslcomp_shaders_dir.h.in

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 02feab53..05d5e959 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,6 +53,15 @@ if (CMAKE_USE_FOLDERS)
     set_property (GLOBAL PROPERTY USE_FOLDERS ON)
 endif ()
 
+option (OSL_INSTALL_SHADERDIR "Shader install directory, absolute or relative (to CMAKE_INSTALL_PREFIX)" "")
+mark_as_advanced (OSL_INSTALL_SHADERDIR)
+if (IS_ABSOLUTE ${OSL_INSTALL_SHADERDIR})
+   set (INSTALL_FULL_SHADERDIR ${OSL_INSTALL_SHADERDIR})
+else()
+   set (INSTALL_FULL_SHADERDIR "${CMAKE_INSTALL_PREFIX}/${OSL_INSTALL_SHADERDIR}")
+endif()
+message (STATUS "Shader install dir  = ${INSTALL_FULL_SHADERDIR}")
+
 include (GNUInstallDirs)
 
 set (CMAKE_MODULE_PATH
diff --git a/src/liboslcomp/CMakeLists.txt b/src/liboslcomp/CMakeLists.txt
index 549aa549..15d9d026 100644
--- a/src/liboslcomp/CMakeLists.txt
+++ b/src/liboslcomp/CMakeLists.txt
@@ -29,6 +29,8 @@ else ()
 
 endif ()
 
+configure_file ( oslcomp_shaders_dir.h.in oslcomp_shaders_dir.h )
+
 TARGET_LINK_LIBRARIES ( oslcomp ${OPENIMAGEIO_LIBRARIES} ${ILMBASE_LIBRARIES}
                        ${Boost_LIBRARIES} ${CMAKE_DL_LIBS}
                        ${CLANG_LIBRARIES} ${LLVM_LIBRARIES} ${LLVM_LDFLAGS}
diff --git a/src/liboslcomp/oslcomp.cpp b/src/liboslcomp/oslcomp.cpp
index a89212aa..d4deda70 100644
--- a/src/liboslcomp/oslcomp.cpp
+++ b/src/liboslcomp/oslcomp.cpp
@@ -36,6 +36,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <cerrno>
 
 #include "oslcomp_pvt.h"
+#include "oslcomp_shaders_dir.h"
 
 #include <OpenImageIO/platform.h>
 #include <OpenImageIO/sysutil.h>
@@ -478,6 +479,14 @@ find_stdoslpath (const std::vector<std::string>& includepaths)
         }
     }
 
+    // Try the regular install directory
+    std::string install_path = OSL_SHADERS_INSTALL_DIR;
+    if (OIIO::Filesystem::is_directory (install_path)) {
+        install_path = install_path + "/stdosl.h";
+        if (OIIO::Filesystem::exists (install_path))
+            return ustring(install_path);
+    }
+
     // Try looking for "oslc" binary in the $PATH, and if so, look in
     // ../../shaders/stdosl.h
     std::vector<std::string> exec_path_dirs;
diff --git a/src/liboslcomp/oslcomp_shaders_dir.h.in b/src/liboslcomp/oslcomp_shaders_dir.h.in
new file mode 100644
index 00000000..0638252f
--- /dev/null
+++ b/src/liboslcomp/oslcomp_shaders_dir.h.in
@@ -0,0 +1,7 @@
+#ifndef OSL_SHADERS_INSTALL_DIR
+
+// Keep this in sync with the DESTINATION in shaders/CMakeLists.txt
+// and shaders/MaterialX/CMakeLists.txt
+#define OSL_SHADERS_INSTALL_DIR "@INSTALL_FULL_SHADERDIR@/shaders/"
+
+#endif // OSL_SHADERS_INSTALL_DIR
diff --git a/src/liboslexec/CMakeLists.txt b/src/liboslexec/CMakeLists.txt
index eb8f0fa9..ff5595cc 100644
--- a/src/liboslexec/CMakeLists.txt
+++ b/src/liboslexec/CMakeLists.txt
@@ -41,6 +41,7 @@ if (NOT BUILDSTATIC)
 endif ()
 
 include_directories ( "${CMAKE_SOURCE_DIR}/src/liboslcomp" )
+include_directories ( "${CMAKE_BINARY_DIR}/src/liboslcomp" )
 
 FILE ( GLOB exec_headers "*.h" )
 FILE ( GLOB compiler_headers "../liboslcomp/*.h" )
diff --git a/src/shaders/CMakeLists.txt b/src/shaders/CMakeLists.txt
index 9b263ffa..594c09cb 100644
--- a/src/shaders/CMakeLists.txt
+++ b/src/shaders/CMakeLists.txt
@@ -63,4 +63,4 @@ add_custom_target (shaders ALL
                    SOURCES ${shader_source} ${shader_headers})
 
 install (FILES ${shader_headers} ${shader_source} ${shader_objs}
-        DESTINATION shaders)
+        DESTINATION ${INSTALL_FULL_SHADERDIR}/shaders)
diff --git a/src/shaders/MaterialX/CMakeLists.txt b/src/shaders/MaterialX/CMakeLists.txt
index 98f54840..d134fcde 100644
--- a/src/shaders/MaterialX/CMakeLists.txt
+++ b/src/shaders/MaterialX/CMakeLists.txt
@@ -196,5 +196,5 @@ add_custom_target (mxshaders ALL
                    SOURCES ${shader_source} ${mx_shader_headers})
 
 install (FILES ${mx_shader_headers} ${mx_shader_objs} ${mx_shader_osls}
-         DESTINATION shaders/MaterialX)
+         DESTINATION ${INSTALL_FULL_SHADERDIR}/shaders/MaterialX)
 
-- 
2.20.1