Merge pull request #1871 from abergmeier/fixup_eglSwapBuffers

Fix eglSwapBuffers

1 files changed, 15 insertions, 1 deletions

diff --git a/src/library_egl.js b/src/library_egl.js
index 69dd266d..e2d1df43 100644
--- a/src/library_egl.js
+++ b/src/library_egl.js
@@ -550,7 +550,21 @@ var LibraryEGL = {
   
   // EGLAPI EGLBoolean EGLAPIENTRY eglSwapBuffers(EGLDisplay dpy, EGLSurface surface);
   eglSwapBuffers: function() {
-    EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
+    if (!EGL.defaultDisplayInitialized) {
+      EGL.setErrorCode(0x3001 /* EGL_NOT_INITIALIZED */);
+    } else if (!Module.ctx) {
+      EGL.setErrorCode(0x3002 /* EGL_BAD_ACCESS */);
+    } else if (Module.ctx.isContextLost()) {
+      EGL.setErrorCode(0x300E /* EGL_CONTEXT_LOST */);
+    } else {
+      // According to documentation this does an implicit flush.
+      // Due to discussion at https://github.com/kripken/emscripten/pull/1871
+      // the flush was removed since this _may_ result in slowing code down.
+      //_glFlush();
+      EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
+      return 1; // EGL_TRUE
+    }
+    return 0; // EGL_FALSE
   },
 
   eglGetProcAddress__deps: ['emscripten_GetProcAddress'],