mirror of https://github.com/liamg/aminal.git
62 lines
1.4 KiB
Go
62 lines
1.4 KiB
Go
// This file is generated from mgl32/matstack\matstack.go; DO NOT EDIT
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package matstack
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import (
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"errors"
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"github.com/go-gl/mathgl/mgl64"
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)
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// A MatStack is an OpenGL-style matrix stack,
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// usually used for things like scenegraphs. This allows you
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// to easily maintain matrix state per call level.
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type MatStack []mgl64.Mat4
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func NewMatStack() *MatStack {
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return &MatStack{mgl64.Ident4()}
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}
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// Copies the top element and pushes it on the stack.
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func (ms *MatStack) Push() {
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(*ms) = append(*ms, (*ms)[len(*ms)-1])
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}
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// Removes the first element of the matrix from the stack, if there is only one element left
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// there is an error.
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func (ms *MatStack) Pop() error {
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if len(*ms) == 1 {
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return errors.New("Cannot pop from mat stack, at minimum stack length of 1")
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}
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(*ms) = (*ms)[:len(*ms)-1]
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return nil
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}
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// Right multiplies the current top of the matrix by the
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// argument.
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func (ms *MatStack) RightMul(m mgl64.Mat4) {
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(*ms)[len(*ms)-1] = (*ms)[len(*ms)-1].Mul4(m)
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}
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// Left multiplies the current top of the matrix by the
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// argument.
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func (ms *MatStack) LeftMul(m mgl64.Mat4) {
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(*ms)[len(*ms)-1] = m.Mul4((*ms)[len(*ms)-1])
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}
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// Returns the top element.
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func (ms *MatStack) Peek() mgl64.Mat4 {
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return (*ms)[len(*ms)-1]
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}
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// Rewrites the top element of the stack with m
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func (ms *MatStack) Load(m mgl64.Mat4) {
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(*ms)[len(*ms)-1] = m
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}
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// A shortcut for Load(mgl.Ident4())
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func (ms *MatStack) LoadIdent() {
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(*ms)[len(*ms)-1] = mgl64.Ident4()
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}
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