func ImageData(img image.Image) (gl.Sizei, gl.Sizei, gl.Enum, gl.Enum, gl.Pointer) {
switch img := img.(type) {
case *image.NRGBA:
return gl.Sizei(img.Rect.Dx()), gl.Sizei(img.Rect.Dy()), gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&img.Pix[0])
case *image.RGBA:
return gl.Sizei(img.Rect.Dx()), gl.Sizei(img.Rect.Dy()), gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&img.Pix[0])
default:
panic(reflect.TypeOf(img))
}
return 0, 0, gl.RGB, gl.UNSIGNED_BYTE, nil
}
func DrawGeometry(geo *Geometry, vertexAttribute gl.AttributeLocation, vao gl.VertexArrayObject) {
gl.BindBuffer(gl.ARRAY_BUFFER, geo.VertexBuffer)
gl.BindVertexArray(vao)
gl.VertexAttribPointer(vertexAttribute, 3, gl.FLOAT, gl.FALSE, 12, nil)
gl.EnableVertexAttribArray(vertexAttribute)
for _, elem := range geo.Elements {
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, elem.Buffer)
gl.DrawElements(elem.DrawType, gl.Sizei(elem.Count), gl.UNSIGNED_SHORT, nil)
PanicOnError()
}
gl.DisableVertexAttribArray(vertexAttribute)
}
func (r *Receiver) DrawGeometry(geo *gtk.Geometry, vertexAttribute gl.AttributeLocation, lines bool) {
gl.BindBuffer(gl.ARRAY_BUFFER, geo.VertexBuffer)
gl.BindVertexArray(r.Data.Vao)
gl.VertexAttribPointer(vertexAttribute, 3, gl.FLOAT, gl.FALSE, 12, nil)
gl.EnableVertexAttribArray(vertexAttribute)
for _, elem := range geo.Elements {
if lines == (elem.DrawType == gl.LINES) {
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, elem.Buffer)
gl.DrawElements(elem.DrawType, gl.Sizei(elem.Count), gl.UNSIGNED_SHORT, nil)
gtk.PanicOnError()
}
}
gl.DisableVertexAttribArray(vertexAttribute)
}