mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 04:08:53 +01:00
54 lines
1.4 KiB
Go
54 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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"unsafe"
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"golang.org/x/sys/windows"
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)
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var (
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opengl32 = windows.NewLazySystemDLL("opengl32")
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procWglGetProcAddress = opengl32.NewProc("wglGetProcAddress")
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)
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func (c *defaultContext) init() error {
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return nil
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}
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func (c *defaultContext) getProcAddress(namea string) uintptr {
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cname, err := windows.BytePtrFromString(namea)
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if err != nil {
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panic(err)
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}
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r, _, err := procWglGetProcAddress.Call(uintptr(unsafe.Pointer(cname)))
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if r != 0 {
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return r
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}
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if err != nil && err != windows.ERROR_SUCCESS && err != windows.ERROR_PROC_NOT_FOUND {
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panic(fmt.Sprintf("gl: wglGetProcAddress failed for %s: %s", namea, err.Error()))
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}
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p := opengl32.NewProc(namea)
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if err := p.Find(); 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 p.Addr()
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}
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