mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
57 lines
1.4 KiB
Go
57 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 gl
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import (
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"fmt"
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"strings"
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"github.com/ebitengine/purego"
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)
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var (
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opengl uintptr
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)
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func (c *defaultContext) init() error {
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lib, errGLES := purego.Dlopen("OpenGLES.framework/OpenGLES", purego.RTLD_LAZY|purego.RTLD_GLOBAL)
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if errGLES == nil {
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c.isES = true
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opengl = lib
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return nil
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}
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lib, errGL := purego.Dlopen("OpenGL.framework/OpenGL", purego.RTLD_LAZY|purego.RTLD_GLOBAL)
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if errGL == nil {
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opengl = lib
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return nil
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}
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// TODO: Use multiple %w-s as of Go 1.20
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return fmt.Errorf("gl: failed to load: OpenGL.framework: %v, OpenGLES.framework: %v", errGL, errGLES)
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}
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func (c *defaultContext) getProcAddress(name string) uintptr {
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if c.isES {
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name = strings.TrimSuffix(name, "EXT")
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}
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proc, err := purego.Dlsym(opengl, name)
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if err != nil {
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// The proc is not found.
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return 0
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}
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return proc
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}
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