1 files changed, 50 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/modules/webgl/webgl_multi_draw_common.cc b/chromium/third_party/blink/renderer/modules/webgl/webgl_multi_draw_common.cc
new file mode 100644
index 00000000000..93dca19698a
--- /dev/null
+++ b/chromium/third_party/blink/renderer/modules/webgl/webgl_multi_draw_common.cc
@@ -0,0 +1,50 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "third_party/blink/renderer/modules/webgl/webgl_multi_draw_common.h"
+
+namespace blink {
+
+bool WebGLMultiDrawCommon::ValidateDrawcount(
+    WebGLExtensionScopedContext* scoped,
+    const char* function_name,
+    GLsizei drawcount) {
+  if (drawcount < 0) {
+    scoped->Context()->SynthesizeGLError(GL_INVALID_VALUE, function_name,
+                                         "negative drawcount");
+    return false;
+  }
+  return true;
+}
+
+bool WebGLMultiDrawCommon::ValidateArray(WebGLExtensionScopedContext* scoped,
+                                         const char* function_name,
+                                         const char* outOfBoundsDescription,
+                                         size_t size,
+                                         GLuint offset,
+                                         GLsizei drawcount) {
+  if (static_cast<uint32_t>(drawcount) > size) {
+    scoped->Context()->SynthesizeGLError(GL_INVALID_OPERATION, function_name,
+                                         "drawcount out of bounds");
+    return false;
+  }
+  if (offset >= size) {
+    scoped->Context()->SynthesizeGLError(GL_INVALID_OPERATION, function_name,
+                                         outOfBoundsDescription);
+    return false;
+  }
+  return true;
+}
+
+base::span<const int32_t> WebGLMultiDrawCommon::MakeSpan(
+    const Int32ArrayOrLongSequence& array) {
+  if (array.IsInt32Array()) {
+    return base::span<const int32_t>(array.GetAsInt32Array().View()->Data(),
+                                     array.GetAsInt32Array().View()->length());
+  }
+  return base::span<const int32_t>(array.GetAsLongSequence().data(),
+                                   array.GetAsLongSequence().size());
+}
+
+}  // namespace blink