2016-11-22 09:59:24 -06:00
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package pixelgl
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2016-11-23 11:50:49 -06:00
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import (
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"errors"
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"runtime"
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"github.com/go-gl/gl/v2.1/gl"
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)
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2016-11-22 09:59:24 -06:00
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// Due to the existance and usage of thread-local variables by OpenGL, it's recommended to
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// execute all OpenGL calls from a single dedicated thread. This file defines functions to make
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// it possible.
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var (
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callQueue = make(chan func())
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//TODO: some OpenGL state variables will be here
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)
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func init() {
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go func() {
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runtime.LockOSThread()
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for f := range callQueue {
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2016-11-23 11:50:49 -06:00
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getLastGLErr() // swallow unchecked errors
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2016-11-22 09:59:24 -06:00
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f()
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}
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}()
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}
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// Do executes a function inside a dedicated OpenGL thread.
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// Do blocks until the function finishes.
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//
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// All OpenGL calls must be done in the dedicated thread.
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func Do(f func()) {
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done := make(chan bool)
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callQueue <- func() {
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f()
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done <- true
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}
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<-done
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}
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// DoErr executes a function inside a dedicated OpenGL thread and returns an error to the called.
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// DoErr blocks until the function finishes.
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//
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// All OpenGL calls must be done in the dedicated thread.
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func DoErr(f func() error) error {
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err := make(chan error)
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callQueue <- func() {
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err <- f()
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}
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return <-err
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}
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// DoVal executes a function inside a dedicated OpenGL thread and returns a value to the caller.
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// DoVal blocks until the function finishes.
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//
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// All OpenGL calls must be done in the dedicated thread.
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func DoVal(f func() interface{}) interface{} {
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val := make(chan interface{})
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callQueue <- func() {
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val <- f()
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}
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return <-val
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}
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2016-11-23 11:50:49 -06:00
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// DoGLErr is same as Do, but also return an error generated by OpenGL.
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func DoGLErr(f func()) (gl error) {
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glerr := make(chan error)
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callQueue <- func() {
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f()
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glerr <- getLastGLErr()
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}
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return <-glerr
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}
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// DoErrGLErr is same as DoErr, but also returns an error generated by OpenGL.
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func DoErrGLErr(f func() error) (_, gl error) {
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err := make(chan error)
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glerr := make(chan error)
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callQueue <- func() {
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err <- f()
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glerr <- getLastGLErr()
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}
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return <-err, <-glerr
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}
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// DoValGLErr is same as DoVal, but also returns an error generated by OpenGL.
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func DoValGLErr(f func() interface{}) (_ interface{}, gl error) {
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val := make(chan interface{})
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glerr := make(chan error)
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callQueue <- func() {
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val <- f()
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glerr <- getLastGLErr()
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}
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return <-val, <-glerr
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}
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// getLastGLErr returns (and consumes) the last error generated by OpenGL.
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// Don't use outside DoGLErr, DoErrGLErr and DoValGLErr.
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func getLastGLErr() error {
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err := uint32(gl.NO_ERROR)
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for e := gl.GetError(); e != gl.NO_ERROR; e = gl.GetError() {
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err = e
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}
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if err == gl.NO_ERROR {
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return nil
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}
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switch err {
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case gl.INVALID_ENUM:
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return errors.New("invalid enum")
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case gl.INVALID_VALUE:
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return errors.New("invalid value")
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case gl.INVALID_OPERATION:
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return errors.New("invalid operation")
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case gl.STACK_OVERFLOW:
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return errors.New("stack overflow")
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case gl.STACK_UNDERFLOW:
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return errors.New("stack underflow")
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case gl.OUT_OF_MEMORY:
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return errors.New("out of memory")
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case gl.INVALID_FRAMEBUFFER_OPERATION:
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return errors.New("invalid framebuffer operation")
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case gl.CONTEXT_LOST:
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return errors.New("context lost")
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default:
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return errors.New("unknown error")
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}
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}
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