mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
111 lines
2.6 KiB
Go
111 lines
2.6 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 !android && !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 void* libGL() {
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// static void* so;
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// if (!so) {
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// so = dlopen("libGL.so", 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("libGLESv2.so", 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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"strings"
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"unsafe"
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)
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func (c *defaultContext) init() error {
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var preferES bool
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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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// Try OpenGL first. OpenGL is preferrable as this doesn't cause context losts.
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if !preferES {
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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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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 libGLES.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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const ext = "EXT"
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if strings.HasSuffix(name, ext) {
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name = name[:len(name)-len(ext)]
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}
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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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