bd8fa0d7bb
Change-Id: I310c365300cb3fbf8a1abb630e26661fa7ef4844 Reviewed-on: https://go-review.googlesource.com/11824 Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
76 lines
2.0 KiB
Go
76 lines
2.0 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin
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package glutil
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// TODO(crawshaw): Only used in glutil tests for now (cgo is not support in _test.go files).
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// TODO(crawshaw): Export some kind of Context. Work out what we can offer, where. Maybe just for tests.
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// TODO(crawshaw): Support android and windows.
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/*
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#cgo LDFLAGS: -framework OpenGL
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#import <OpenGL/OpenGL.h>
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#import <OpenGL/gl3.h>
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void CGCreate(CGLContextObj* ctx) {
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CGLPixelFormatAttribute attributes[] = {
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kCGLPFAOpenGLProfile, (CGLPixelFormatAttribute)kCGLOGLPVersion_3_2_Core,
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kCGLPFAColorSize, (CGLPixelFormatAttribute)24,
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kCGLPFAAlphaSize, (CGLPixelFormatAttribute)8,
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kCGLPFADepthSize, (CGLPixelFormatAttribute)16,
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kCGLPFAAccelerated,
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kCGLPFADoubleBuffer,
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(CGLPixelFormatAttribute) 0
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};
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CGLPixelFormatObj pix;
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GLint num;
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CGLChoosePixelFormat(attributes, &pix, &num);
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CGLCreateContext(pix, 0, ctx);
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CGLDestroyPixelFormat(pix);
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CGLSetCurrentContext(*ctx);
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CGLLockContext(*ctx);
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}
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*/
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import "C"
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import "runtime"
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// contextGL holds a copy of the OpenGL Context from thread-local storage.
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//
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// Do not move a contextGL between goroutines or OS threads.
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type contextGL struct {
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ctx C.CGLContextObj
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}
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// createContext creates an OpenGL context, binds it as the current context
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// stored in thread-local storage, and locks the current goroutine to an os
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// thread.
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func createContext() *contextGL {
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// The OpenGL active context is stored in TLS.
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runtime.LockOSThread()
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c := new(contextGL)
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C.CGCreate(&c.ctx)
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// Using attribute arrays in OpenGL 3.3 requires the use of a VBA.
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// But VBAs don't exist in ES 2. So we bind a default one.
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var id C.GLuint
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C.glGenVertexArrays(1, &id)
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C.glBindVertexArray(id)
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return c
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}
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// destroy destroys an OpenGL context and unlocks the current goroutine from
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// its os thread.
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func (c *contextGL) destroy() {
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C.CGLUnlockContext(c.ctx)
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C.CGLSetCurrentContext(nil)
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C.CGLDestroyContext(c.ctx)
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c.ctx = nil
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runtime.UnlockOSThread()
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}
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