Fix glDrawArrays

Fixes a bug introduced in f73929c2c6c9229f71470502faab14178d561157. The
parameters of the current implementation of the glDrawArrays cannot be
deduced from the function prototype but the buffer length can be used.

Change-Id: I3296bfeff983f517d5a003e1f3c52de39b190b9d
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/plugins/platforms/webgl/webqt.jsx b/src/plugins/platforms/webgl/webqt.jsx
index 4d68c63..9a2e34f 100644
--- a/src/plugins/platforms/webgl/webqt.jsx
+++ b/src/plugins/platforms/webgl/webqt.jsx
@@ -958,10 +958,12 @@ window.onload = function () {
             obj["parameterCount"] = 4;
         else if (obj["function"] === "swapBuffers")
             obj["parameterCount"] = 0;
+        else if (obj["function"] == "drawArrays")
+            obj["parameterCount"] = null; // glDrawArrays has a variable number of arguments
         else
             obj["parameterCount"] = gl[obj["function"]].length;
         function deserialize(container, count) {
-            for (var i = 0; i < count; ++i) {
+            for (var i = 0; count != null ? i < count : offset + 4 < buffer.byteLength; ++i) {
                 var character = view.getUint8(offset);
                 offset += 1;
                 var parameterType = String.fromCharCode(character);