1 files changed, 19 insertions, 18 deletions
diff --git a/src/3rdparty/angle/src/libANGLE/VertexAttribute.cpp b/src/3rdparty/angle/src/libANGLE/VertexAttribute.cpp
index 19934e7fac..13d78fd13c 100644
--- a/src/3rdparty/angle/src/libANGLE/VertexAttribute.cpp
+++ b/src/3rdparty/angle/src/libANGLE/VertexAttribute.cpp
@@ -23,24 +23,6 @@ VertexAttribute::VertexAttribute()
 {
 }
 
-bool operator==(const VertexAttribute &a, const VertexAttribute &b)
-{
-    return a.enabled == b.enabled &&
-           a.type == b.type &&
-           a.size == b.size &&
-           a.normalized == b.normalized &&
-           a.pureInteger == b.pureInteger &&
-           a.stride == b.stride &&
-           a.pointer == b.pointer &&
-           a.buffer.get() == b.buffer.get() &&
-           a.divisor == b.divisor;
-}
-
-bool operator!=(const VertexAttribute &a, const VertexAttribute &b)
-{
-    return !(a == b);
-}
-
 size_t ComputeVertexAttributeTypeSize(const VertexAttribute& attrib)
 {
     GLuint size = attrib.size;
@@ -70,4 +52,23 @@ size_t ComputeVertexAttributeStride(const VertexAttribute& attrib)
     return attrib.stride ? attrib.stride : ComputeVertexAttributeTypeSize(attrib);
 }
 
+size_t ComputeVertexAttributeElementCount(const VertexAttribute &attrib,
+                                          size_t drawCount,
+                                          size_t instanceCount)
+{
+    // For instanced rendering, we draw "instanceDrawCount" sets of "vertexDrawCount" vertices.
+    //
+    // A vertex attribute with a positive divisor loads one instanced vertex for every set of
+    // non-instanced vertices, and the instanced vertex index advances once every "mDivisor"
+    // instances.
+    if (instanceCount > 0 && attrib.divisor > 0)
+    {
+        // When instanceDrawCount is not a multiple attrib.divisor, the division must round up.
+        // For instance, with 5 non-instanced vertices and a divisor equal to 3, we need 2 instanced
+        // vertices.
+        return (instanceCount + attrib.divisor - 1u) / attrib.divisor;
+    }
+
+    return drawCount;
+}
 }