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64 lines
1.1 KiB
Go
Executable File
64 lines
1.1 KiB
Go
Executable File
package buffers
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import (
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"github.com/bloeys/nmage/logging"
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"github.com/go-gl/gl/v4.1-core/gl"
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)
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type VertexBuffer struct {
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Id uint32
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Stride int32
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layout []Element
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}
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func (vb *VertexBuffer) Bind() {
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gl.BindBuffer(gl.ARRAY_BUFFER, vb.Id)
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}
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func (vb *VertexBuffer) UnBind() {
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gl.BindBuffer(gl.ARRAY_BUFFER, 0)
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}
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func (vb *VertexBuffer) SetData(values []float32, usage BufUsage) {
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vb.Bind()
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sizeInBytes := len(values) * 4
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if sizeInBytes == 0 {
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gl.BufferData(gl.ARRAY_BUFFER, 0, gl.Ptr(nil), usage.ToGL())
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} else {
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gl.BufferData(gl.ARRAY_BUFFER, sizeInBytes, gl.Ptr(&values[0]), usage.ToGL())
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}
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}
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func (vb *VertexBuffer) GetLayout() []Element {
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e := make([]Element, len(vb.layout))
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copy(e, vb.layout)
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return e
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}
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func (vb *VertexBuffer) SetLayout(layout ...Element) {
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vb.Stride = 0
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vb.layout = layout
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for i := 0; i < len(vb.layout); i++ {
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vb.layout[i].Offset = int(vb.Stride)
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vb.Stride += vb.layout[i].Size()
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}
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}
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func NewVertexBuffer(layout ...Element) VertexBuffer {
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vb := VertexBuffer{}
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gl.GenBuffers(1, &vb.Id)
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if vb.Id == 0 {
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logging.ErrLog.Println("Failed to create OpenGL buffer")
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}
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vb.SetLayout(layout...)
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return vb
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}
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