From 36c8177fe852d9a909da421da0ccb88ba1151795 Mon Sep 17 00:00:00 2001
From: Roger Leigh <[EMAIL REDACTED]>
Date: Sun, 29 May 2022 11:17:30 +0100
Subject: [PATCH] cmake: Add tiff-opengl option
---
CMakeLists.txt | 2 +-
cmake/OpenGLChecks.cmake | 7 +++++++
tools/CMakeLists.txt | 2 +-
3 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 770b0fac..e886e3a5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -197,5 +197,5 @@ message(STATUS "")
message(STATUS " C++ support: ${cxx} (requested) ${CXX_SUPPORT} (availability)")
message(STATUS "")
# message(STATUS " X Athena Widgets support: ${HAVE_XAW}")
-message(STATUS " OpenGL support: ${HAVE_OPENGL}")
+message(STATUS " OpenGL support: Requested:${tiff-opengl} Availability:${HAVE_OPENGL} Support:${OPENGL_SUPPORT}")
message(STATUS "")
diff --git a/cmake/OpenGLChecks.cmake b/cmake/OpenGLChecks.cmake
index 8d4142aa..4b11d70f 100644
--- a/cmake/OpenGLChecks.cmake
+++ b/cmake/OpenGLChecks.cmake
@@ -29,6 +29,7 @@ set(OpenGL_GL_PREFERENCE LEGACY)
find_package(OpenGL COMPONENTS OpenGL)
find_package(GLUT)
+set(OPENGL_SUPPORT FALSE)
set(HAVE_OPENGL FALSE)
if(OPENGL_FOUND AND OPENGL_GLU_FOUND AND GLUT_FOUND)
set(HAVE_OPENGL TRUE)
@@ -41,3 +42,9 @@ check_include_file(GL/glut.h HAVE_GL_GLUT_H)
check_include_file(GLUT/glut.h HAVE_GLUT_GLUT_H)
check_include_file(OpenGL/gl.h HAVE_OPENGL_GL_H)
check_include_file(OpenGL/glu.h HAVE_OPENGL_GLU_H)
+
+option(tiff-opengl "use OpenGL (required for tiffgt viewer)" ${HAVE_OPENGL})
+
+if (tiff-opengl AND HAVE_OPENGL)
+ set(OPENGL_SUPPORT TRUE)
+endif()
diff --git a/tools/CMakeLists.txt b/tools/CMakeLists.txt
index ac64bd84..e0feaebe 100755
--- a/tools/CMakeLists.txt
+++ b/tools/CMakeLists.txt
@@ -124,7 +124,7 @@ install(TARGETS fax2ps
tiffsplit
RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
-if(HAVE_OPENGL)
+if(OPENGL_SUPPORT)
add_executable(tiffgt ../placeholder.h)
target_sources(tiffgt PRIVATE tiffgt.c)
target_link_libraries(tiffgt PRIVATE tiff port)