forked from joejulian/gio
Egon Elbre
123 lines
2.8 KiB
Go
123 lines
2.8 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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//go:build darwin && !ios && nometal
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package app
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import (
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"errors"
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"runtime"
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"unsafe"
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"gioui.org/gpu"
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"gioui.org/internal/gl"
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)
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/*
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#cgo CFLAGS: -DGL_SILENCE_DEPRECATION -xobjective-c -fobjc-arc
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#cgo LDFLAGS: -framework OpenGL
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#include <CoreFoundation/CoreFoundation.h>
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#include <CoreGraphics/CoreGraphics.h>
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#include <AppKit/AppKit.h>
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#include <dlfcn.h>
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__attribute__ ((visibility ("hidden"))) CFTypeRef gio_createGLContext(void);
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__attribute__ ((visibility ("hidden"))) void gio_setContextView(CFTypeRef ctx, CFTypeRef view);
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__attribute__ ((visibility ("hidden"))) void gio_makeCurrentContext(CFTypeRef ctx);
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__attribute__ ((visibility ("hidden"))) void gio_updateContext(CFTypeRef ctx);
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__attribute__ ((visibility ("hidden"))) void gio_flushContextBuffer(CFTypeRef ctx);
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__attribute__ ((visibility ("hidden"))) void gio_clearCurrentContext(void);
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__attribute__ ((visibility ("hidden"))) void gio_lockContext(CFTypeRef ctxRef);
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__attribute__ ((visibility ("hidden"))) void gio_unlockContext(CFTypeRef ctxRef);
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typedef void (*PFN_glFlush)(void);
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static void glFlush(PFN_glFlush f) {
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f();
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}
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*/
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import "C"
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type glContext struct {
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c *gl.Functions
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ctx C.CFTypeRef
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view C.CFTypeRef
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glFlush C.PFN_glFlush
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}
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func newContext(w *window) (*glContext, error) {
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clib := C.CString("/System/Library/Frameworks/OpenGL.framework/OpenGL")
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defer C.free(unsafe.Pointer(clib))
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lib, err := C.dlopen(clib, C.RTLD_NOW|C.RTLD_LOCAL)
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if err != nil {
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return nil, err
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}
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csym := C.CString("glFlush")
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defer C.free(unsafe.Pointer(csym))
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glFlush := C.PFN_glFlush(C.dlsym(lib, csym))
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if glFlush == nil {
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return nil, errors.New("gl: missing symbol glFlush in the OpenGL framework")
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}
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view := w.contextView()
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ctx := C.gio_createGLContext()
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if ctx == 0 {
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return nil, errors.New("gl: failed to create NSOpenGLContext")
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}
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C.gio_setContextView(ctx, view)
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c := &glContext{
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ctx: ctx,
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view: view,
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glFlush: glFlush,
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}
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return c, nil
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}
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func (c *glContext) RenderTarget() (gpu.RenderTarget, error) {
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return gpu.OpenGLRenderTarget{}, nil
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}
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func (c *glContext) API() gpu.API {
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return gpu.OpenGL{}
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}
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func (c *glContext) Release() {
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if c.ctx != 0 {
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C.gio_clearCurrentContext()
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C.CFRelease(c.ctx)
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c.ctx = 0
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}
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}
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func (c *glContext) Present() error {
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// Assume the caller already locked the context.
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C.glFlush(c.glFlush)
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return nil
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}
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func (c *glContext) Lock() error {
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// OpenGL contexts are implicit and thread-local. Lock the OS thread.
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runtime.LockOSThread()
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C.gio_lockContext(c.ctx)
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C.gio_makeCurrentContext(c.ctx)
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return nil
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}
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func (c *glContext) Unlock() {
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C.gio_clearCurrentContext()
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C.gio_unlockContext(c.ctx)
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}
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func (c *glContext) Refresh() error {
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c.Lock()
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defer c.Unlock()
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C.gio_updateContext(c.ctx)
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return nil
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}
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func (w *window) NewContext() (context, error) {
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return newContext(w)
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}
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