Fixed a lot of bugs with render surfaces and bitmaps.

samples/o3d-webgl/param.js

 /*
  * Copyright 2010, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 731 matching lines @@
 /**
  * Called to specify the value of a uniform variable.
  */
 o3d.ParamMatrix4.prototype.applyToLocation = function(gl, location) {
   gl.uniformMatrix4fv(location,
                       false,
                       o3d.Transform.flattenMatrix4(this.value));
 };
 
 /**
+ * A counter to ensure each texture sampler gets a unqiue id.
+ * @private
+ */
+o3d.Param.texture_index_ = 0;
+
+/**
  * Called to specify the value of a uniform variable.
  */
 o3d.ParamSampler.prototype.applyToLocation = function(gl, location) {
-  var i = 0;
+  // When before the effect object assigns values to parameters,
+  // it sets this variable to 0.
+  var i = o3d.Param.texture_index_;
   gl.activeTexture(gl.TEXTURE0 + i);
-  if (!this.value || !this.value.texture || !this.value.texture.texture_) {
-    throw ('Attempt to use texture parameter before texture value set.');
+
+  var value = null;
+
+  if (this.value && this.value.texture && this.value.texture.texture_) {
+    value = this.value.texture.texture_;
   }
-  gl.bindTexture(gl.TEXTURE_2D, this.value.texture.texture_);
+
+  gl.bindTexture(gl.TEXTURE_2D, value);
   gl.uniform1i(location, i);
+  o3d.Param.texture_index_++;
 };
 
 
 /**
  * Object to compute all combinations of world/view/projection
  * inverse/transpose matrices and provide them as parameters.
  * 
  * @type {o3d.ParamObject}
  */
 o3d.Param.SAS = new o3d.ParamObject;
@@ skipping 72 matching lines @@
  */
 o3d.Param.SAS.setProjection = function(projection) {
   var adjustedProjection =
           [[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 2, 0], [0, 0, -1, 1]];
       o3d.Transform.compose(
           adjustedProjection, projection, adjustedProjection);
   this['projection'] = projection;
 };