mirror of
https://git.sr.ht/~eliasnaur/gio
synced 2026-07-01 15:45:38 +00:00
Elias Naur
b34216c124
To prepare package headless for multiple backends, refactor the common headless driver to no longer assume an OpenGL context. Instead, introduce a headless backend type and the OpenGL implementation, glBackend. Signed-off-by: Elias Naur <mail@eliasnaur.com>
59 lines
1010 B
Go
59 lines
1010 B
Go
// SPDX-License-Identifier: Unlicense OR MIT
|
|
|
|
package headless
|
|
|
|
import (
|
|
"errors"
|
|
"syscall/js"
|
|
|
|
"gioui.org/app/internal/glimpl"
|
|
"gioui.org/gpu"
|
|
"gioui.org/gpu/gl"
|
|
)
|
|
|
|
type jsContext struct {
|
|
ctx js.Value
|
|
f *glimpl.Functions
|
|
}
|
|
|
|
func newGLContext() (glContext, error) {
|
|
version := 2
|
|
doc := js.Global().Get("document")
|
|
cnv := doc.Call("createElement", "canvas")
|
|
ctx := cnv.Call("getContext", "webgl2")
|
|
if ctx.IsNull() {
|
|
version = 1
|
|
ctx = cnv.Call("getContext", "webgl")
|
|
}
|
|
if ctx.IsNull() {
|
|
return nil, errors.New("headless: webgl is not supported")
|
|
}
|
|
f := &glimpl.Functions{Ctx: ctx}
|
|
if err := f.Init(version); err != nil {
|
|
return nil, err
|
|
}
|
|
c := &jsContext{
|
|
ctx: ctx,
|
|
f: f,
|
|
}
|
|
return c, nil
|
|
}
|
|
|
|
func (c *jsContext) Backend() (gpu.Backend, error) {
|
|
return gl.NewBackend(c.f)
|
|
}
|
|
|
|
func (c *jsContext) Functions() *glimpl.Functions {
|
|
return c.f
|
|
}
|
|
|
|
func (c *jsContext) Release() {
|
|
}
|
|
|
|
func (c *jsContext) ReleaseCurrent() {
|
|
}
|
|
|
|
func (c *jsContext) MakeCurrent() error {
|
|
return nil
|
|
}
|