60 lines
1.2 KiB
Go
60 lines
1.2 KiB
Go
package main
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import "github.com/go-gl/gl/v4.1-core/gl"
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type VertexBuffer struct {
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bufferId uint32
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}
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func NewVertexBuffer(data []float32) *VertexBuffer {
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var bufferID uint32
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gl.GenBuffers(1, &bufferID)
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gl.BindBuffer(gl.ARRAY_BUFFER, bufferID)
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gl.BufferData(gl.ARRAY_BUFFER, len(data)*4, gl.Ptr(data), gl.STATIC_DRAW)
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return &VertexBuffer{bufferId: bufferID}
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}
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func (vb *VertexBuffer) Bind() {
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gl.BindBuffer(gl.ARRAY_BUFFER, vb.bufferId)
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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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type VertexArray struct {
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ID uint32
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}
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func NewVertexArray() *VertexArray {
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var id uint32
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gl.GenVertexArrays(1, &id)
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return &VertexArray{ID: id}
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}
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func (va *VertexArray) AddBuffer(vb *VertexBuffer, layout []int32) {
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va.Bind()
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vb.Bind()
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stride := int32(0)
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for _, size := range layout {
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stride += size
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}
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stride *= 4 // Each float is 4 bytes
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offset := uintptr(0)
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for i, size := range layout {
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gl.EnableVertexAttribArray(uint32(i))
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gl.VertexAttribPointer(uint32(i), size, gl.FLOAT, false, stride, gl.PtrOffset(int(offset)))
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offset += uintptr(size * 4)
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}
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}
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func (va *VertexArray) Bind() {
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gl.BindVertexArray(va.ID)
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}
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func (va *VertexArray) Unbind() {
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gl.BindVertexArray(0)
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}
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