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 LoadShader(filename string, shader_type uint32) (shader uint32) {
var shader_bytes []byte
var shader_string string
var shader_err error
var status int32
shader = gl.CreateShader(shader_type)
shader_bytes, shader_err = ioutil.ReadFile(filename)
shader_bytes = append(shader_bytes, []byte("\x00")[0])
if shader_err != nil {
log.Fatal("Could not load shader from file: ", filename)
}
shader_string = string(shader_bytes)
csource := gl.Str(shader_string)
gl.ShaderSource(shader, 1, &csource, nil)
gl.CompileShader(shader)
gl.GetShaderiv(shader, gl.COMPILE_STATUS, &status)
if status == gl.FALSE {
log.Printf("Compile error in shader %s:\n", filename)
var logLength int32
gl.GetShaderiv(shader, gl.INFO_LOG_LENGTH, &logLength)
l := strings.Repeat("\x00", int(logLength+1))
gl.GetShaderInfoLog(shader, logLength, nil, gl.Str(l))
log.Fatal(l)
}
return
}