github.com/SkycoinProject/gomobile@v0.0.0-20190312151609-d3739f865fa6/exp/gl/glutil/context_x11.go (about)

     1  // Copyright 2014 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // +build linux,!android
     6  
     7  package glutil
     8  
     9  /*
    10  #cgo LDFLAGS: -lEGL
    11  #include <EGL/egl.h>
    12  #include <stdio.h>
    13  #include <stdlib.h>
    14  
    15  void createContext(EGLDisplay *out_dpy, EGLContext *out_ctx, EGLSurface *out_surf) {
    16  	EGLDisplay e_dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
    17  	if (!e_dpy) {
    18  		fprintf(stderr, "eglGetDisplay failed\n");
    19  		exit(1);
    20  	}
    21  	EGLint e_major, e_minor;
    22  	if (!eglInitialize(e_dpy, &e_major, &e_minor)) {
    23  		fprintf(stderr, "eglInitialize failed\n");
    24  		exit(1);
    25  	}
    26  	eglBindAPI(EGL_OPENGL_ES_API);
    27  	static const EGLint config_attribs[] = {
    28  		EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
    29  		EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
    30  		EGL_BLUE_SIZE, 8,
    31  		EGL_GREEN_SIZE, 8,
    32  		EGL_RED_SIZE, 8,
    33  		EGL_CONFIG_CAVEAT, EGL_NONE,
    34  		EGL_NONE
    35  	};
    36  	EGLConfig config;
    37  	EGLint num_configs;
    38  	if (!eglChooseConfig(e_dpy, config_attribs, &config, 1, &num_configs)) {
    39  		fprintf(stderr, "eglChooseConfig failed\n");
    40  		exit(1);
    41  	}
    42  	static const EGLint ctx_attribs[] = {
    43  		EGL_CONTEXT_CLIENT_VERSION, 2,
    44  		EGL_NONE
    45  	};
    46  	EGLContext e_ctx = eglCreateContext(e_dpy, config, EGL_NO_CONTEXT, ctx_attribs);
    47  	if (e_ctx == EGL_NO_CONTEXT) {
    48  		fprintf(stderr, "eglCreateContext failed\n");
    49  		exit(1);
    50  	}
    51  	static const EGLint pbuf_attribs[] = {
    52  		EGL_NONE
    53  	};
    54  	EGLSurface e_surf = eglCreatePbufferSurface(e_dpy, config, pbuf_attribs);
    55  	if (e_surf == EGL_NO_SURFACE) {
    56  		fprintf(stderr, "eglCreatePbufferSurface failed\n");
    57  		exit(1);
    58  	}
    59  	if (!eglMakeCurrent(e_dpy, e_surf, e_surf, e_ctx)) {
    60  		fprintf(stderr, "eglMakeCurrent failed\n");
    61  		exit(1);
    62  	}
    63  	*out_surf = e_surf;
    64  	*out_ctx = e_ctx;
    65  	*out_dpy = e_dpy;
    66  }
    67  
    68  void destroyContext(EGLDisplay e_dpy, EGLContext e_ctx, EGLSurface e_surf) {
    69  	if (!eglMakeCurrent(e_dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT)) {
    70  		fprintf(stderr, "eglMakeCurrent failed\n");
    71  		exit(1);
    72  	}
    73  	if (!eglDestroySurface(e_dpy, e_surf)) {
    74  		fprintf(stderr, "eglDestroySurface failed\n");
    75  		exit(1);
    76  	}
    77  	if (!eglDestroyContext(e_dpy, e_ctx)) {
    78  		fprintf(stderr, "eglDestroyContext failed\n");
    79  		exit(1);
    80  	}
    81  }
    82  */
    83  import "C"
    84  
    85  import (
    86  	"runtime"
    87  )
    88  
    89  type contextGL struct {
    90  	dpy  C.EGLDisplay
    91  	ctx  C.EGLContext
    92  	surf C.EGLSurface
    93  }
    94  
    95  func createContext() (*contextGL, error) {
    96  	runtime.LockOSThread()
    97  	c := &contextGL{}
    98  	C.createContext(&c.dpy, &c.ctx, &c.surf)
    99  	return c, nil
   100  }
   101  
   102  func (c *contextGL) destroy() {
   103  	C.destroyContext(c.dpy, c.ctx, c.surf)
   104  	runtime.UnlockOSThread()
   105  }