61 lines
1.8 KiB
Go
61 lines
1.8 KiB
Go
|
// +build js,wasm
|
||
|
|
|
||
|
|
package glfw
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
"syscall/js"
|
||
|
|
)
|
||
|
|
|
||
|
|
func newContext(canvas js.Value, ca *contextAttributes) (context js.Value, err error) {
|
||
|
|
if js.Global().Get("WebGLRenderingContext").Equal(js.Undefined()) {
|
||
|
|
return js.Value{}, errors.New("Your browser doesn't appear to support WebGL.")
|
||
|
|
}
|
||
|
|
|
||
|
|
attrs := map[string]interface{}{
|
||
|
|
"alpha": ca.Alpha,
|
||
|
|
"depth": ca.Depth,
|
||
|
|
"stencil": ca.Stencil,
|
||
|
|
"antialias": ca.Antialias,
|
||
|
|
"premultipliedAlpha": ca.PremultipliedAlpha,
|
||
|
|
"preserveDrawingBuffer": ca.PreserveDrawingBuffer,
|
||
|
|
"preferLowPowerToHighPerformance": ca.PreferLowPowerToHighPerformance,
|
||
|
|
"failIfMajorPerformanceCaveat": ca.FailIfMajorPerformanceCaveat,
|
||
|
|
}
|
||
|
|
|
||
|
|
if gl := canvas.Call("getContext", "webgl", attrs); !gl.Equal(js.Null()) {
|
||
|
|
debug := js.Global().Get("WebGLDebugUtils")
|
||
|
|
if debug.Equal(js.Undefined()) {
|
||
|
|
return gl, errors.New("No debugging for WebGL.")
|
||
|
|
}
|
||
|
|
gl = debug.Call("makeDebugContext", gl)
|
||
|
|
return gl, nil
|
||
|
|
} else if gl := canvas.Call("getContext", "experimental-webgl", attrs); gl.Equal(js.Null()) {
|
||
|
|
return gl, nil
|
||
|
|
} else {
|
||
|
|
return js.Value{}, errors.New("Creating a WebGL context has failed.")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
type contextAttributes struct {
|
||
|
|
Alpha bool
|
||
|
|
Depth bool
|
||
|
|
Stencil bool
|
||
|
|
Antialias bool
|
||
|
|
PremultipliedAlpha bool
|
||
|
|
PreserveDrawingBuffer bool
|
||
|
|
PreferLowPowerToHighPerformance bool
|
||
|
|
FailIfMajorPerformanceCaveat bool
|
||
|
|
}
|
||
|
|
|
||
|
|
func defaultAttributes() *contextAttributes {
|
||
|
|
return &contextAttributes{
|
||
|
|
Alpha: false,
|
||
|
|
Depth: true,
|
||
|
|
Stencil: false,
|
||
|
|
Antialias: false,
|
||
|
|
PremultipliedAlpha: false,
|
||
|
|
PreserveDrawingBuffer: false,
|
||
|
|
}
|
||
|
|
}
|