mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
48 lines
1.4 KiB
Go
48 lines
1.4 KiB
Go
// Copyright 2022 The Ebitengine Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package opengl
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import (
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"fmt"
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"syscall/js"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl/gl"
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)
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// NewGraphics creates an implementation of graphicsdriver.Graphics for OpenGL.
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// The returned graphics value is nil iff the error is not nil.
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func NewGraphics(canvas js.Value) (graphicsdriver.Graphics, error) {
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var glContext js.Value
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attr := js.Global().Get("Object").New()
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attr.Set("alpha", true)
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attr.Set("premultipliedAlpha", true)
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attr.Set("stencil", true)
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glContext = canvas.Call("getContext", "webgl2", attr)
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if !glContext.Truthy() {
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return nil, fmt.Errorf("opengl: getContext for webgl2 failed")
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}
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ctx, err := gl.NewDefaultContext(glContext)
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if err != nil {
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return nil, err
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}
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return newGraphics(ctx), nil
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}
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