106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
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// 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 linux,!android
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package glutil
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/*
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#cgo LDFLAGS: -lEGL
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#include <EGL/egl.h>
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#include <stdio.h>
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#include <stdlib.h>
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void createContext(EGLDisplay *out_dpy, EGLContext *out_ctx, EGLSurface *out_surf) {
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EGLDisplay e_dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
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if (!e_dpy) {
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fprintf(stderr, "eglGetDisplay failed\n");
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exit(1);
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}
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EGLint e_major, e_minor;
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if (!eglInitialize(e_dpy, &e_major, &e_minor)) {
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fprintf(stderr, "eglInitialize failed\n");
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exit(1);
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}
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eglBindAPI(EGL_OPENGL_ES_API);
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static const EGLint config_attribs[] = {
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EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
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EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
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EGL_BLUE_SIZE, 8,
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EGL_GREEN_SIZE, 8,
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EGL_RED_SIZE, 8,
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EGL_CONFIG_CAVEAT, EGL_NONE,
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EGL_NONE
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};
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EGLConfig config;
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EGLint num_configs;
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if (!eglChooseConfig(e_dpy, config_attribs, &config, 1, &num_configs)) {
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fprintf(stderr, "eglChooseConfig failed\n");
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exit(1);
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}
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static const EGLint ctx_attribs[] = {
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EGL_CONTEXT_CLIENT_VERSION, 2,
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EGL_NONE
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};
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EGLContext e_ctx = eglCreateContext(e_dpy, config, EGL_NO_CONTEXT, ctx_attribs);
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if (e_ctx == EGL_NO_CONTEXT) {
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fprintf(stderr, "eglCreateContext failed\n");
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exit(1);
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}
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static const EGLint pbuf_attribs[] = {
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EGL_NONE
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};
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EGLSurface e_surf = eglCreatePbufferSurface(e_dpy, config, pbuf_attribs);
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if (e_surf == EGL_NO_SURFACE) {
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fprintf(stderr, "eglCreatePbufferSurface failed\n");
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exit(1);
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}
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if (!eglMakeCurrent(e_dpy, e_surf, e_surf, e_ctx)) {
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fprintf(stderr, "eglMakeCurrent failed\n");
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exit(1);
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}
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*out_surf = e_surf;
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*out_ctx = e_ctx;
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*out_dpy = e_dpy;
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}
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void destroyContext(EGLDisplay e_dpy, EGLContext e_ctx, EGLSurface e_surf) {
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if (!eglMakeCurrent(e_dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT)) {
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fprintf(stderr, "eglMakeCurrent failed\n");
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exit(1);
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}
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if (!eglDestroySurface(e_dpy, e_surf)) {
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fprintf(stderr, "eglDestroySurface failed\n");
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exit(1);
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}
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if (!eglDestroyContext(e_dpy, e_ctx)) {
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fprintf(stderr, "eglDestroyContext failed\n");
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exit(1);
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}
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}
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*/
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import "C"
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import (
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"runtime"
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)
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type contextGL struct {
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dpy C.EGLDisplay
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ctx C.EGLContext
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surf C.EGLSurface
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}
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func createContext() *contextGL {
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runtime.LockOSThread()
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c := &contextGL{}
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C.createContext(&c.dpy, &c.ctx, &c.surf)
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return c
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}
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func (c *contextGL) destroy() {
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C.destroyContext(c.dpy, c.ctx, c.surf)
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runtime.UnlockOSThread()
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}
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