clean up gl emulation flush, remove unneeded and incorrect bindings

1 files changed, 14 insertions, 4 deletions

diff --git a/src/library_gl.js b/src/library_gl.js
index ea0301ac..9bf206f5 100644
--- a/src/library_gl.js
+++ b/src/library_gl.js
@@ -1430,12 +1430,15 @@ var LibraryGL = {
         Module.ctx.bufferData(Module.ctx.ELEMENT_ARRAY_BUFFER, this.indexData.subarray(0, numIndexes), Module.ctx.STATIC_DRAW);
       }
 
-      Module.ctx.bindBuffer(Module.ctx.ARRAY_BUFFER, this.vertexObject);
-      Module.ctx.bufferData(Module.ctx.ARRAY_BUFFER, this.vertexData.subarray(0, this.vertexCounter), Module.ctx.STATIC_DRAW);
+      if (!GL.currArrayBuffer) {
+        Module.ctx.bindBuffer(Module.ctx.ARRAY_BUFFER, this.vertexObject);
+        Module.ctx.bufferData(Module.ctx.ARRAY_BUFFER, this.vertexData.subarray(0, this.vertexCounter), Module.ctx.STATIC_DRAW);
+      }
 
       // Render
-      Module.ctx.useProgram(renderer.program);
-      Module.ctx.bindBuffer(Module.ctx.ARRAY_BUFFER, this.vertexObject);
+      if (!GL.currProgram) {
+        Module.ctx.useProgram(renderer.program);
+      }
 
       renderer.prepare();
 
@@ -1448,6 +1451,13 @@ var LibraryGL = {
         Module.ctx.drawArrays(GL.immediate.mode, 0, numVertexes);
       }
 
+      if (!GL.currArrayBuffer) {
+        Module.ctx.bindBuffer(Module.ctx.ARRAY_BUFFER, null);
+      }
+      if (!GL.currProgram) {
+        Module.ctx.useProgram(null);
+      }
+
       this.vertexCounter = 0;
     }
   },