1 files changed, 15 insertions, 0 deletions
diff --git a/src/library_gl.js b/src/library_gl.js
index c134ad97..16ea5531 100644
--- a/src/library_gl.js
+++ b/src/library_gl.js
@@ -657,6 +657,20 @@ var LibraryGL = {
 
   glBufferData__sig: 'viiii',
   glBufferData: function(target, size, data, usage) {
+    switch (usage) { // fix usages, WebGL only has *_DRAW
+      case 0x88E1: // GL_STREAM_READ
+      case 0x88E2: // GL_STREAM_COPY
+        usage = 0x88E0; // GL_STREAM_DRAW
+        break;
+      case 0x88E5: // GL_STATIC_READ
+      case 0x88E6: // GL_STATIC_COPY
+        usage = 0x88E4; // GL_STATIC_DRAW
+        break;
+      case 0x88E9: // GL_DYNAMIC_READ
+      case 0x88EA: // GL_DYNAMIC_COPY
+        usage = 0x88E8; // GL_DYNAMIC_DRAW
+        break;
+    }
     Module.ctx.bufferData(target, HEAPU8.subarray(data, data+size), usage);
   },
 
@@ -3398,6 +3412,7 @@ var LibraryGL = {
       // does not work for glBegin/End, where we generate renderer components dynamically and then
       // disable them ourselves, but it does help with glDrawElements/Arrays.
       if (!this.modifiedClientAttributes) {
+        GL.immediate.vertexCounter = (GL.immediate.stride * count) / 4; // XXX assuming float
         return;
       }
       this.modifiedClientAttributes = false;