Document GL_FFP_ONLY setting in src/settings.js.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/settings.js b/src/settings.js
index 64884eec..753e2367 100644
--- a/src/settings.js
+++ b/src/settings.js
@@ -224,6 +224,10 @@ var GL_UNSAFE_OPTS = 1; // Enables some potentially-unsafe optimizations in GL e
 var FULL_ES2 = 0; // Forces support for all GLES2 features, not just the WebGL-friendly subset.
 var LEGACY_GL_EMULATION = 0; // Includes code to emulate various desktop GL features. Incomplete but useful
                              // in some cases, see https://github.com/kripken/emscripten/wiki/OpenGL-support
+var GL_FFP_ONLY = 0; // If you specified LEGACY_GL_EMULATION = 1 and only use fixed function pipeline in your code,
+                     // you can also set this to 1 to signal the GL emulation layer that it can perform extra
+                     // optimizations by knowing that the user code does not use shaders at all. If 
+                     // LEGACY_GL_EMULATION = 0, this setting has no effect.
 
 var STB_IMAGE = 0; // Enables building of stb-image, a tiny public-domain library for decoding images, allowing
                    // decoding of images without using the browser's built-in decoders. The benefit is that this