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df7b7b731e
Instead, libGL.so.1 might exist. Use LD_LIBRARY_PATH and list the candidates. Closes #2523
189 lines
4.3 KiB
Go
189 lines
4.3 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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//go:build !darwin && !js && !nintendosdk && !windows
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package gl
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// #cgo LDFLAGS: -ldl
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//
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// #include <dlfcn.h>
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// #include <stdlib.h>
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//
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// static const char* libGLName;
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// static const char* libGLESName;
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//
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// static void setLibGLName(const char* name) {
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// libGLName = name;
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// }
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//
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// static void setLibGLESName(const char* name) {
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// libGLESName = name;
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// }
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//
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// static void* libGL() {
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// static void* so;
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// if (!so) {
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// so = dlopen(libGLName, RTLD_LAZY | RTLD_GLOBAL);
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// }
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// return so;
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// }
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//
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// static void* libGLES() {
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// static void* so;
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// if (!so) {
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// so = dlopen(libGLESName, RTLD_LAZY | RTLD_GLOBAL);
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// }
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// return so;
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// }
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//
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// static void* getProcAddressGL(const char* name) {
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// static void*(*glXGetProcAddress)(const char*);
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// if (!glXGetProcAddress) {
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// glXGetProcAddress = dlsym(libGL(), "glXGetProcAddress");
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// if (!glXGetProcAddress) {
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// glXGetProcAddress = dlsym(libGL(), "glXGetProcAddressARB");
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// }
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// }
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// return glXGetProcAddress(name);
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// }
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//
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// static void* getProcAddressGLES(const char* name) {
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// return dlsym(libGLES(), name);
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// }
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import "C"
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import (
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"fmt"
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"os"
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"path/filepath"
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"runtime"
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"sort"
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"strings"
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"unsafe"
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)
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func findLib(libraryPaths []string, libName string) (string, error) {
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// Look for a library file. In some environments like Steam, a library with the exactly same name might not exist (#2523).
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// For example, libGL.so.1 might exist instead of libGL.so.
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for _, dir := range libraryPaths {
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libs, err := listLibs(dir, libName)
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if err != nil {
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return "", err
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}
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if len(libs) == 0 {
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continue
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}
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// The file names are sorted in the alphabetical order. Use the first item.
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// TODO: What is the best version to use?
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return filepath.Join(dir, libs[0]), nil
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}
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// LD_LIBRARY_PATH might be empty. Use the original name.
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return libName, nil
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}
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func listLibs(dir string, prefix string) ([]string, error) {
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ents, err := os.ReadDir(dir)
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if err != nil {
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return nil, err
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}
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var files []string
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for _, ent := range ents {
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if ent.IsDir() {
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continue
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}
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if ent.Name() == prefix {
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files = append(files, ent.Name())
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continue
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}
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if strings.HasPrefix(ent.Name(), prefix+".") {
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files = append(files, ent.Name())
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continue
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}
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}
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sort.Strings(files)
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return files, nil
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}
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func (c *defaultContext) init() error {
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var preferES bool
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if runtime.GOOS == "android" {
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preferES = true
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}
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if !preferES {
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for _, t := range strings.Split(os.Getenv("EBITENGINE_OPENGL"), ",") {
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switch strings.TrimSpace(t) {
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case "es":
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preferES = true
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break
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}
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}
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}
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libraryPaths := filepath.SplitList(os.Getenv("LD_LIBRARY_PATH"))
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// Try OpenGL first. OpenGL is preferrable as this doesn't cause context losts.
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if !preferES {
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libGLName, err := findLib(libraryPaths, "libGL.so")
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if err != nil {
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return err
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}
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// This string is never released.
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C.setLibGLName(C.CString(libGLName))
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if C.libGL() != nil {
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return nil
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}
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}
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// Try OpenGL ES.
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libGLESName, err := findLib(libraryPaths, "libGLESv2.so")
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if err != nil {
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return err
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}
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// This string is never released.
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C.setLibGLESName(C.CString(libGLESName))
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if C.libGLES() != nil {
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c.isES = true
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return nil
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}
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return fmt.Errorf("gl: failed to load libGL.so and libGLESv2.so")
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}
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func (c *defaultContext) getProcAddress(name string) unsafe.Pointer {
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if c.isES {
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return getProcAddressGLES(name)
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}
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return getProcAddressGL(name)
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}
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func getProcAddressGL(name string) unsafe.Pointer {
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cname := C.CString(name)
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defer C.free(unsafe.Pointer(cname))
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return C.getProcAddressGL(cname)
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}
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func getProcAddressGLES(name string) unsafe.Pointer {
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name = strings.TrimSuffix(name, "EXT")
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cname := C.CString(name)
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defer C.free(unsafe.Pointer(cname))
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return C.getProcAddressGLES(cname)
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}
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