# GLKit Functions ## Topics ### Functions [`func GLKMatrixStackCreate(CFAllocator?) -> Unmanaged?`](/documentation/GLKit/GLKMatrixStackCreate(_:)) Allocates and returns a new matrix stack. [`func GLKMatrixStackGetMatrix2(GLKMatrixStack) -> GLKMatrix2`](/documentation/GLKit/GLKMatrixStackGetMatrix2(_:)) Returns the top-left `2x2` corner of the top matrix. [`func GLKMatrixStackGetMatrix3(GLKMatrixStack) -> GLKMatrix3`](/documentation/GLKit/GLKMatrixStackGetMatrix3(_:)) Returns the top-left `3x3` corner of the top matrix. [`func GLKMatrixStackGetMatrix3Inverse(GLKMatrixStack) -> GLKMatrix3`](/documentation/GLKit/GLKMatrixStackGetMatrix3Inverse(_:)) Fetches the top-left `3x3` corner of the top matrix and returns its inverse. [`func GLKMatrixStackGetMatrix3InverseTranspose(GLKMatrixStack) -> GLKMatrix3`](/documentation/GLKit/GLKMatrixStackGetMatrix3InverseTranspose(_:)) Fetches the top-left `3x3` corner of the top matrix and returns its inverse transpose. [`func GLKMatrixStackGetMatrix4(GLKMatrixStack) -> GLKMatrix4`](/documentation/GLKit/GLKMatrixStackGetMatrix4(_:)) Returns a copy of the top matrix on the stack. [`func GLKMatrixStackGetMatrix4Inverse(GLKMatrixStack) -> GLKMatrix4`](/documentation/GLKit/GLKMatrixStackGetMatrix4Inverse(_:)) Returns the inverse of the top matrix. [`func GLKMatrixStackGetMatrix4InverseTranspose(GLKMatrixStack) -> GLKMatrix4`](/documentation/GLKit/GLKMatrixStackGetMatrix4InverseTranspose(_:)) Returns the inverse transpose of the top matrix. [`func GLKMatrixStackGetTypeID() -> CFTypeID`](/documentation/GLKit/GLKMatrixStackGetTypeID()) Returns the Core Foundation type for a matrix stack. [`func GLKMatrixStackLoadMatrix4(GLKMatrixStack, GLKMatrix4)`](/documentation/GLKit/GLKMatrixStackLoadMatrix4(_:_:)) Replaces the contents of the top matrix with a new matrix. [`func GLKMatrixStackMultiplyMatrix4(GLKMatrixStack, GLKMatrix4)`](/documentation/GLKit/GLKMatrixStackMultiplyMatrix4(_:_:)) Replaces the contents of the top matrix with a matrix calculated by multiplying the contents of the top matrix by another matrix. [`func GLKMatrixStackMultiplyMatrixStack(GLKMatrixStack, GLKMatrixStack)`](/documentation/GLKit/GLKMatrixStackMultiplyMatrixStack(_:_:)) Replaces the contents of the top matrix with a matrix calculated by multiplying the contents of the top matrix by the top matrix of another matrix stack. [`func GLKMatrixStackPop(GLKMatrixStack)`](/documentation/GLKit/GLKMatrixStackPop(_:)) Removes the topmost entry from the stack. [`func GLKMatrixStackPush(GLKMatrixStack)`](/documentation/GLKit/GLKMatrixStackPush(_:)) Push a copy of the topmost matrix onto the top of the stack. [`func GLKMatrixStackRotate(GLKMatrixStack, Float, Float, Float, Float)`](/documentation/GLKit/GLKMatrixStackRotate(_:_:_:_:_:)) Replaces the contents of the top matrix with a matrix calculated by composing the top matrix with a rotation around an arbitrary axis. [`func GLKMatrixStackRotateWithVector3(GLKMatrixStack, Float, GLKVector3)`](/documentation/GLKit/GLKMatrixStackRotateWithVector3(_:_:_:)) Replaces the contents of the top matrix with a matrix calculated by composing the top matrix with a rotation around an arbitrary axis. [`func GLKMatrixStackRotateWithVector4(GLKMatrixStack, Float, GLKVector4)`](/documentation/GLKit/GLKMatrixStackRotateWithVector4(_:_:_:)) Replaces the contents of the top matrix with a matrix calculated by composing the top matrix with a rotation around an arbitrary axis. [`func GLKMatrixStackRotateX(GLKMatrixStack, Float)`](/documentation/GLKit/GLKMatrixStackRotateX(_:_:)) Replaces the contents of the top matrix with a matrix calculated by composing the top matrix with a rotation around the positive-x axis. [`func GLKMatrixStackRotateY(GLKMatrixStack, Float)`](/documentation/GLKit/GLKMatrixStackRotateY(_:_:)) Replaces the contents of the top matrix with a matrix calculated by composing the top matrix with a rotation around the positive-y axis. [`func GLKMatrixStackRotateZ(GLKMatrixStack, Float)`](/documentation/GLKit/GLKMatrixStackRotateZ(_:_:)) Replaces the contents of the top matrix with a matrix calculated by composing the top matrix with a rotation around the positive-z axis. [`func GLKMatrixStackScale(GLKMatrixStack, Float, Float, Float)`](/documentation/GLKit/GLKMatrixStackScale(_:_:_:_:)) Replaces the contents of the top matrix with a matrix calculated by scaling the contents of the top matrix. [`func GLKMatrixStackScaleWithVector3(GLKMatrixStack, GLKVector3)`](/documentation/GLKit/GLKMatrixStackScaleWithVector3(_:_:)) Replaces the contents of the top matrix with a matrix calculated by composing the top matrix with a scaling operation. [`func GLKMatrixStackScaleWithVector4(GLKMatrixStack, GLKVector4)`](/documentation/GLKit/GLKMatrixStackScaleWithVector4(_:_:)) Replaces the contents of the top matrix with a matrix calculated by composing the top matrix with a scaling operation defined by a vector. [`func GLKMatrixStackSize(GLKMatrixStack) -> Int32`](/documentation/GLKit/GLKMatrixStackSize(_:)) Returns the number of matrices present on the matrix stack. [`func GLKMatrixStackTranslate(GLKMatrixStack, Float, Float, Float)`](/documentation/GLKit/GLKMatrixStackTranslate(_:_:_:_:)) Replaces the contents of the top matrix with a matrix calculated by composing the top matrix with a translation operation. [`func GLKMatrixStackTranslateWithVector3(GLKMatrixStack, GLKVector3)`](/documentation/GLKit/GLKMatrixStackTranslateWithVector3(_:_:)) Replaces the contents of the top matrix with a matrix calculated by composing the top matrix with a translation defined by a vector. [`func GLKMatrixStackTranslateWithVector4(GLKMatrixStack, GLKVector4)`](/documentation/GLKit/GLKMatrixStackTranslateWithVector4(_:_:)) Replaces the contents of the top matrix with a matrix calculated by composing the top matrix with a translation defined by a vector. [`func GLKVertexAttributeParametersFromModelIO(MDLVertexFormat) -> GLKVertexAttributeParameters`](/documentation/GLKit/GLKVertexAttributeParametersFromModelIO(_:)) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)