Fix opengl sample on macOS and disable on Linux

samples/opengl/build.gradle

@@ -1,18 +1,7 @@
 apply plugin: 'konan'
 
-konanInterop {
-    opengl { }
-}
-
-
 konanArtifacts {
-    OpenGlTeapotMacbook {
-        useInterop 'opengl'
+    OpenGlTeapot {
         target "macbook"
     }
-
-    OpenGlTeapotLinux {
-        useInterop 'opengl'
-        target "linux"
-    }
 }

samples/opengl/build.sh

@@ -6,23 +6,13 @@ PATH=$DIR/../../dist/bin:$DIR/../../bin:$PATH
 if [ x$TARGET == x ]; then
 case "$OSTYPE" in
   darwin*)  TARGET=macbook ;;
-  linux*)   TARGET=linux ;;
   *)        echo "unknown: $OSTYPE" && exit 1;;
 esac
 fi
 
-var=CFLAGS_${TARGET}
-CFLAGS=${!var}
-var=COMPILER_ARGS_${TARGET}
-COMPILER_ARGS=${!var} # add -opt for an optimized build.
-
-mkdir -p $DIR/build/c_interop/
 mkdir -p $DIR/build/bin/
 
-cinterop -def $DIR/src/main/c_interop/opengl.def -target $TARGET \
-	 -o $DIR/build/c_interop/opengl || exit 1
-
-konanc -target $TARGET $DIR/src/main/kotlin/OpenGlTeapot.kt -library $DIR/build/c_interop/opengl \
+konanc -target $TARGET $DIR/src/main/kotlin/OpenGlTeapot.kt \
        -o $DIR/build/bin/OpenGlTeapot || exit 1
 
 echo "Artifact path is $DIR/build/bin/OpenGlTeapot.kexe"

samples/opengl/src/main/c_interop/opengl.def

@@ -1,7 +0,0 @@
-headers.osx = OpenGL/gl.h OpenGL/glu.h GLUT/glut.h
-headers.linux = GL/glut.h
-compilerOpts.osx = -framework OpenGL -framework GLUT
-compilerOpts.linux = -I/usr/include
-excludeDependentModules.osx = true
-linkerOpts.osx = -framework OpenGL -framework GLUT
-linkerOpts.linux = -L/usr/lib/x86_64-linux-gnu -lglut -lGL -lGLU

samples/opengl/src/main/kotlin/OpenGlTeapot.kt

@@ -15,7 +15,9 @@
  */
 
 import kotlinx.cinterop.*
-import opengl.*
+import platform.GLUT.*
+import platform.OpenGL.*
+import platform.OpenGLCommon.*
 
 // Ported from http://openglsamples.sourceforge.net/projects/index.php/blog/index/