Implement support for ES 3.0 instanced arrays

src/libANGLE/renderer/d3d/VertexDataManager.cpp

@@ -46,7 +46,9 @@ static int StreamingBufferElementCount(const gl::VertexAttribute &attrib, int ve
     // non-instanced vertices, and the instanced vertex index advances once every "mDivisor" instances.
     if (instanceDrawCount > 0 && attrib.divisor > 0)
     {
-        return instanceDrawCount / attrib.divisor;
+        // 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 (instanceDrawCount + attrib.divisor - 1) / attrib.divisor;
     }
 
     return vertexDrawCount;

src/libGLESv2/entry_points_gles_3_0.cpp

@@ -2265,8 +2265,17 @@ void GL_APIENTRY DrawArraysInstanced(GLenum mode, GLint first, GLsizei count, GL
             return;
         }
 
-        // glDrawArraysInstanced
-        UNIMPLEMENTED();
+        if (!ValidateDrawArraysInstanced(context, mode, first, count, instanceCount))
+        {
+            return;
+        }
+
+        Error error = context->drawArrays(mode, first, count, instanceCount);
+        if (error.isError())
+        {
+            context->recordError(error);
+            return;
+        }
     }
 }
 
@@ -2284,8 +2293,18 @@ void GL_APIENTRY DrawElementsInstanced(GLenum mode, GLsizei count, GLenum type,
             return;
         }
 
-        // glDrawElementsInstanced
-        UNIMPLEMENTED();
+        rx::RangeUI indexRange;
+        if (!ValidateDrawElementsInstanced(context, mode, count, type, indices, instanceCount, &indexRange))
+        {
+            return;
+        }
+
+        Error error = context->drawElements(mode, count, type, indices, instanceCount, indexRange);
+        if (error.isError())
+        {
+            context->recordError(error);
+            return;
+        }
     }
 }