png is a new dependency in sprite.cpp - add it to build system

configure

@@ -29,10 +29,15 @@ parser.add_option("--glfw3",
     dest="glfw3",
     help="Path to gflw3 (defaults to using pkg-config)")
 
+parser.add_option("--png",
+    action="store",
+    dest="png",
+    help="Path to png (defaults to using pkg-config)")
+
 (options, args) = parser.parse_args()
 
 def pkg_config(pkg):
-  cmd = os.popen('pkg-config --libs %s' % pkg, 'r')
+  cmd = os.popen('pkg-config --static --libs %s' % pkg, 'r')
   libs = cmd.readline().strip()
   ret = cmd.close()
   if (ret): return None
@@ -64,6 +69,19 @@ def configure_glfw3(o):
       o['variables']['glfw3_libraries'] = ret[0].split()
       o['variables']['glfw3_cflags'] = ret[1].split()
 
+def configure_png(o):
+  if options.glfw3:
+      o['variables']['png_libraries'] = '-L'+os.path.join(options.png,'lib')
+      o['variables']['png_libraries'] += '-lpng'
+      o['variables']['png_cflags'] += '-I'+os.path.join(options.png,'lib')
+  else:
+      ret = pkg_config('libpng')
+      if not ret:
+          sys.stderr.write('could not find libpng with pkg-config')
+          sys.exit(-1)
+      o['variables']['png_libraries'] = ret[0].split()
+      o['variables']['png_cflags'] = ret[1].split()
+
 def write(filename, data):
   filename = os.path.join(root_dir, filename)
   print "creating ", filename
@@ -89,6 +107,7 @@ def run_gyp(args):
 if __name__ == '__main__':
   configure_llmr(output)
   configure_glfw3(output)
+  configure_png(output)
   pprint.pprint(output, indent=2)
 
   write('config.gypi', "# Do not edit. Generated by the configure script.\n" +

llmr.gyp

@@ -6,44 +6,46 @@
   'targets': [
     {
       'target_name': 'llmr-osx',
-      'product_name': 'libllmr-osx',
+      'product_name': 'llmr-osx',
       'type': 'static_library',
       'sources': [
         '<!@(find src -name "*.cpp")',
         '<!@(find include -name "*.hpp")'
       ],
+      'libraries': [
+        '<@(png_libraries)',
+      ],
       'xcode_settings': {
         'SDKROOT': 'macosx',
         'SUPPORTED_PLATFORMS':'macosx',
         'MACOSX_DEPLOYMENT_TARGET':'10.8',
         'PUBLIC_HEADERS_FOLDER_PATH': 'include'
       },
-      'conditions': [
-        ['OS == "mac"', {
-          'link_settings': {
-            'libraries': [
-              '$(SDKROOT)/System/Library/Frameworks/OpenGL.framework',
-            ],
-          },
-        }],
-      ],
       'include_dirs':[
-          './include'
+          './include',
+          '<@(png_cflags)'
       ],
       'direct_dependent_settings': {
           'include_dirs':[
-              './include'
+              './include',
+              '<@(png_cflags)'
           ],
+          'libraries': [
+            '<@(png_libraries)',
+          ]
       }
     },
     {
       'target_name': 'llmr-ios',
-      'product_name': 'libllmr-ios',
+      'product_name': 'llmr-ios',
       'type': 'static_library',
       'sources': [
         '<!@(find src -name "*.cpp")',
         '<!@(find include -name "*.hpp")'
       ],
+      'libraries': [
+        '<@(png_libraries)',
+      ],
       'xcode_settings': {
         'SDKROOT': 'iphoneos',
         'SUPPORTED_PLATFORMS':'iphonesimulator iphoneos',
@@ -53,12 +55,17 @@
         'PUBLIC_HEADERS_FOLDER_PATH': 'include'
       },
       'include_dirs':[
-          './include'
+          './include',
+          '<@(png_cflags)'
       ],
       'direct_dependent_settings': {
           'include_dirs':[
-              './include'
+              './include',
+              '<@(png_cflags)'
           ],
+          'libraries': [
+            '<@(png_libraries)',
+          ]
       }
     }
   ]