mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
104 lines
2.7 KiB
Go
104 lines
2.7 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 (freebsd || linux || netbsd || openbsd) && !nintendosdk && !playstation5
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package gl
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import (
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"fmt"
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"os"
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"runtime"
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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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libGL uintptr
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libGLES uintptr
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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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// Try OpenGL first. OpenGL is preferable as this doesn't cause context losses.
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if !preferES {
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// Usually libGL.so or libGL.so.1 is used. libGL.so.2 might exist only on NetBSD.
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for _, name := range []string{"libGL.so", "libGL.so.2", "libGL.so.1", "libGL.so.0"} {
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lib, err := purego.Dlopen(name, purego.RTLD_LAZY|purego.RTLD_GLOBAL)
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if err == nil {
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libGL = lib
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return nil
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}
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}
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}
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// Try OpenGL ES.
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for _, name := range []string{"libGLESv2.so", "libGLESv2.so.2", "libGLESv2.so.1", "libGLESv2.so.0"} {
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lib, err := purego.Dlopen(name, purego.RTLD_LAZY|purego.RTLD_GLOBAL)
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if err == nil {
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libGLES = lib
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c.isES = true
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return nil
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}
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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) (uintptr, error) {
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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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var glXGetProcAddress func(name string) uintptr
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func getProcAddressGL(name string) (uintptr, error) {
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if glXGetProcAddress == nil {
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if _, err := purego.Dlsym(libGL, "glXGetProcAddress"); err == nil {
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purego.RegisterLibFunc(&glXGetProcAddress, libGL, "glXGetProcAddress")
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} else if _, err := purego.Dlsym(libGL, "glXGetProcAddressARB"); err == nil {
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purego.RegisterLibFunc(&glXGetProcAddress, libGL, "glXGetProcAddressARB")
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}
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}
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if glXGetProcAddress == nil {
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return 0, fmt.Errorf("gl: failed to find glXGetProcAddress or glXGetProcAddressARB in libGL.so")
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}
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return glXGetProcAddress(name), nil
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}
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func getProcAddressGLES(name string) (uintptr, error) {
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proc, err := purego.Dlsym(libGLES, name)
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if err != nil {
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return 0, err
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}
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return proc, nil
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}
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