forget current program and buffers if they are destroyed

1 files changed, 16 insertions, 0 deletions

diff --git a/src/library_gl.js b/src/library_gl.js
index 1b9edd3c..56684797 100644
--- a/src/library_gl.js
+++ b/src/library_gl.js
@@ -1034,6 +1034,12 @@ var LibraryGL = {
         glUseProgram(program);
       }
 
+      var glDeleteProgram = _glDeleteProgram;
+      _glDeleteProgram = function(program) {
+        glDeleteProgram(program);
+        if (program == GL.currProgram) GL.currProgram = 0;
+      };
+
       var glBindBuffer = _glBindBuffer;
       _glBindBuffer = function(target, buffer) {
         glBindBuffer(target, buffer);
@@ -1044,6 +1050,16 @@ var LibraryGL = {
         }
       };
 
+      var glDeleteBuffers = _glDeleteBuffers;
+      _glDeleteBuffers = function(n, buffers) {
+        glDeleteBuffers(n, buffers);
+        for (var i = 0; i < n; i++) {
+          var buffer = {{{ makeGetValue('buffers', 'i*4', 'i32') }}};
+          if (buffer == GL.currArrayBuffer) GL.currArrayBuffer = 0;
+          if (buffer == GL.currElementArrayBuffer) GL.currElementArrayBuffer = 0;
+        }
+      };
+
       var glGetFloatv = _glGetFloatv;
       _glGetFloatv = function(pname, params) {
         if (pname == 0x0BA6) { // GL_MODELVIEW_MATRIX