ebiten/internal/graphicsdriver/opengl/gl/procaddr_windows.go

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// Copyright 2022 The Ebitengine Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gl
import (
"fmt"
"unsafe"
"golang.org/x/sys/windows"
)
var (
opengl32 = windows.NewLazySystemDLL("opengl32")
procWglGetProcAddress = opengl32.NewProc("wglGetProcAddress")
isES = false
)
func getProcAddress(namea string) uintptr {
cname, err := windows.BytePtrFromString(namea)
if err != nil {
panic(err)
}
r, _, err := procWglGetProcAddress.Call(uintptr(unsafe.Pointer(cname)))
if r != 0 {
return r
}
if err != nil && err != windows.ERROR_SUCCESS && err != windows.ERROR_PROC_NOT_FOUND {
panic(fmt.Sprintf("gl: wglGetProcAddress failed for %s: %s", namea, err.Error()))
}
p := opengl32.NewProc(namea)
if err := p.Find(); err != nil {
// The proc is not found.
return 0
}
return p.Addr()
}