func (s *Sprite) GetVAO() (VAO uint32) {
gl.GenVertexArrays(1, &VAO)
gl.BindVertexArray(VAO)
gl.GenBuffers(1, &s.vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, s.vbo)
gl.BufferData(gl.ARRAY_BUFFER, len(s.vertexData)*4, gl.Ptr(&s.vertexData[0]), gl.STATIC_DRAW)
attrib_loc := uint32(gl.GetAttribLocation(s.program, gl.Str("vert\x00")))
color_loc := uint32(gl.GetAttribLocation(s.program, gl.Str("vertColor\x00")))
gl.EnableVertexAttribArray(attrib_loc)
gl.VertexAttribPointer(attrib_loc, 3, gl.FLOAT, false, int32(unsafe.Sizeof(s.vertexData[0]))*7, nil)
gl.EnableVertexAttribArray(color_loc)
gl.VertexAttribPointer(color_loc, 4, gl.FLOAT, false, int32(unsafe.Sizeof(s.vertexData[0]))*7, gl.PtrOffset(3*4))
time_loc := gl.GetUniformLocation(s.program, gl.Str("time\x00"))
gl.Uniform1f(time_loc, s.runtime)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.BindVertexArray(0)
//Update
time := glfw.GetTime()
elapsed := float32(time) - s.previousTime
s.previousTime = float32(time)
s.runtime = s.runtime + elapsed
return
}
func render(w *glfw.Window, program uint32) {
gl.ClearColor(0, 0, 0, 1)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(program)
gl.BindVertexArray(firstSprite.GetVAO())
gl.DrawArrays(gl.TRIANGLES, 0, 6)
//Swap buffers
w.SwapBuffers()
glfw.PollEvents()
gl.UseProgram(0)
}