FORCE_GL_EMULATION option

2 files changed, 9 insertions, 0 deletions

diff --git a/src/library_gl.js b/src/library_gl.js
index 38b330f7..537dce53 100644
--- a/src/library_gl.js
+++ b/src/library_gl.js
@@ -2867,5 +2867,10 @@ LibraryGL.$GLEmulation__deps.push(function() {
   for (var func in Functions.getIndex.tentative) Functions.getIndex(func);
 });
 
+if (FORCE_GL_EMULATION) {
+  LibraryGL.glDrawElements__deps = LibraryGL.glDrawElements__deps.concat('$GLEmulation');
+  LibraryGL.glDrawArrays__deps = LibraryGL.glDrawArrays__deps.concat('$GLEmulation');
+}
+
 mergeInto(LibraryManager.library, LibraryGL);
 
diff --git a/src/settings.js b/src/settings.js
index 4d742060..dbce836d 100644
--- a/src/settings.js
+++ b/src/settings.js
@@ -166,6 +166,10 @@ var GL_DEBUG = 0; // Print out all calls into WebGL. As with LIBRARY_DEBUG, you
 var GL_TESTING = 0; // When enabled, sets preserveDrawingBuffer in the context, to allow tests to work (but adds overhead)
 var GL_MAX_TEMP_BUFFER_SIZE = 2097152; // How large GL emulation temp buffers are
 var GL_UNSAFE_OPTS = 1; // Enables some potentially-unsafe optimizations in GL emulation code
+var FORCE_GL_EMULATION = 0; // Forces inclusion of GL emulation code. This lets you use non-WebGL features
+                            // like clientside data. GL commands that are not in WebGL will automatically
+                            // include this feature, but if you just use pure GLES commands *and* need
+                            // emualation, you will need to enable it manually with this flag.
 
 var DISABLE_EXCEPTION_CATCHING = 0; // Disables generating code to actually catch exceptions. If the code you
                                     // are compiling does not actually rely on catching exceptions (but the