Moved all into one package, added png loader.

vbo.go

@@ -0,0 +1,77 @@
+package goga
+
+import (
+	"github.com/go-gl/gl/v4.5-core/gl"
+	"unsafe"
+)
+
+// Vertex Buffer Object.
+type VBO struct {
+	id     uint32
+	target uint32
+	size   int32
+}
+
+// Creates a new VBO with given target.
+func NewVBO(target uint32) *VBO {
+	vbo := &VBO{target: target}
+	gl.GenBuffers(1, &vbo.id)
+
+	return vbo
+}
+
+// Drops this VBO.
+func (v *VBO) Drop() {
+	gl.DeleteBuffers(1, &v.id)
+}
+
+// Binds VBO for rendering.
+func (v *VBO) Bind() {
+	gl.BindBuffer(v.target, v.id)
+}
+
+// Unbinds.
+func (v *VBO) Unbind() {
+	gl.BindBuffer(v.target, 0)
+}
+
+// Fills VBO with data.
+// An unsafe pointer must be used out of Gos unsafe package.
+func (v *VBO) Fill(data unsafe.Pointer, elements, size int, use uint32) {
+	v.size = int32(size)
+
+	v.Bind()
+	gl.BufferData(v.target, elements*size, data, use)
+	v.Unbind()
+}
+
+// Updates data or part of data.
+// An unsafe pointer must be used out of Gos unsafe package.
+func (v *VBO) Update(data unsafe.Pointer, elements, offset, size int) {
+	v.size = int32(size)
+
+	v.Bind()
+	gl.BufferSubData(v.target, offset, elements*size, data)
+	v.Unbind()
+}
+
+// Sets the attribute pointer for rendering.
+// Used together with shader.
+func (v *VBO) AttribPointer(attribLocation int32, size int32, btype uint32, normalized bool, stride int32) {
+	gl.VertexAttribPointer(uint32(attribLocation), size, btype, normalized, stride, nil)
+}
+
+// Returns the GL ID.
+func (v *VBO) GetId() uint32 {
+	return v.id
+}
+
+// Returns the target.
+func (v *VBO) GetTarget() uint32 {
+	return v.target
+}
+
+// Returns the number of elements within this VBO.
+func (v *VBO) Size() int32 {
+	return v.size
+}