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https://git.sr.ht/~eliasnaur/gio
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Elias Naur
f305f71b20
The new Framebuffer.ReadPixels method is enough to implement Window.Screenshot. Use that instead of the OpenGL-specific implementation. Signed-off-by: Elias Naur <mail@eliasnaur.com>
59 lines
1008 B
Go
59 lines
1008 B
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package headless
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import (
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"errors"
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"syscall/js"
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"gioui.org/app/internal/glimpl"
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"gioui.org/gpu"
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"gioui.org/gpu/gl"
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)
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type jsContext struct {
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ctx js.Value
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f *glimpl.Functions
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}
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func newGLContext() (backend, error) {
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version := 2
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doc := js.Global().Get("document")
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cnv := doc.Call("createElement", "canvas")
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ctx := cnv.Call("getContext", "webgl2")
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if ctx.IsNull() {
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version = 1
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ctx = cnv.Call("getContext", "webgl")
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}
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if ctx.IsNull() {
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return nil, errors.New("headless: webgl is not supported")
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}
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f := &glimpl.Functions{Ctx: ctx}
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if err := f.Init(version); err != nil {
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return nil, err
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}
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c := &jsContext{
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ctx: ctx,
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f: f,
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}
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return c, nil
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}
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func (c *jsContext) Backend() (gpu.Backend, error) {
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return gl.NewBackend(c.f)
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}
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func (c *jsContext) Functions() *glimpl.Functions {
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return c.f
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}
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func (c *jsContext) Release() {
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}
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func (c *jsContext) ReleaseCurrent() {
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}
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func (c *jsContext) MakeCurrent() error {
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return nil
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}
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