2 * freeglut_display_android.c
4 * Window management methods for EGL
6 * Copyright (C) 2012 Sylvain Beucler
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
22 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 #include <GL/freeglut.h>
27 #include "fg_internal.h"
30 * Initialize an EGL context for the current display.
32 void fghCreateNewContextEGL( SFG_Window* window ) {
34 * Here specify the attributes of the desired configuration.
35 * Below, we select an EGLConfig with at least 8 bits per color
36 * component compatible with on-screen windows
38 /* Ensure OpenGLES 2.0 context */
39 printf("DisplayMode: %d (DEPTH %d)\n", fgState.DisplayMode, (fgState.DisplayMode & GLUT_DEPTH));
40 const EGLint attribs[] = {
41 EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
42 EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
46 EGL_ALPHA_SIZE, (fgState.DisplayMode & GLUT_ALPHA) ? 1 : 0,
47 EGL_DEPTH_SIZE, (fgState.DisplayMode & GLUT_DEPTH) ? 1 : 0,
48 EGL_STENCIL_SIZE, (fgState.DisplayMode & GLUT_STENCIL) ? 1 : 0,
49 EGL_SAMPLE_BUFFERS, (fgState.DisplayMode & GLUT_MULTISAMPLE) ? 1 : 0,
50 EGL_SAMPLES, (fgState.DisplayMode & GLUT_MULTISAMPLE) ? fgState.SampleNumber : 0,
59 EGLDisplay eglDisplay = fgDisplay.pDisplay.egl.Display;
61 /* Here, the application chooses the configuration it desires. In this
62 * sample, we have a very simplified selection process, where we pick
63 * the first EGLConfig that matches our criteria */
64 eglChooseConfig(eglDisplay, attribs, &config, 1, &numConfigs);
66 /* EGL_NATIVE_VISUAL_ID is an attribute of the EGLConfig that is
67 * guaranteed to be accepted by ANativeWindow_setBuffersGeometry().
68 * As soon as we picked a EGLConfig, we can safely reconfigure the
69 * ANativeWindow buffers to match, using EGL_NATIVE_VISUAL_ID. */
70 eglGetConfigAttrib(eglDisplay, config, EGL_NATIVE_VISUAL_ID, &format);
72 /* Default, but doesn't hurt */
73 eglBindAPI(EGL_OPENGL_ES_API);
75 /* Ensure OpenGLES 2.0 context */
76 static const EGLint ctx_attribs[] = {
77 EGL_CONTEXT_CLIENT_VERSION, 2,
80 context = eglCreateContext(eglDisplay, config, EGL_NO_CONTEXT, ctx_attribs);
81 if (context == EGL_NO_CONTEXT) {
82 fgWarning("Cannot initialize EGL context, err=%x\n", eglGetError());
83 fghContextCreationError();
86 eglQueryContext(fgDisplay.pDisplay.egl.Display, context, EGL_CONTEXT_CLIENT_VERSION, &ver);
88 fgError("Wrong GLES major version: %d\n", ver);
90 window->Window.Context = context;
91 window->Window.pContext.egl.ContextConfig = config;
92 window->Window.pContext.egl.ContextFormat = format;
96 * Really opens a window when handle is available
98 void fghPlatformOpenWindowEGL( SFG_Window* window )
100 EGLDisplay display = fgDisplay.pDisplay.egl.Display;
101 EGLConfig config = window->Window.pContext.egl.ContextConfig;
103 EGLSurface surface = eglCreateWindowSurface(display, config, window->Window.Handle, NULL);
104 if (surface == EGL_NO_SURFACE)
105 fgError("Cannot create EGL window surface, err=%x\n", eglGetError());
106 if (eglMakeCurrent(display, surface, surface, window->Window.Context) == EGL_FALSE)
107 fgError("eglMakeCurrent: err=%x\n", eglGetError());
110 //eglQuerySurface(display, surface, EGL_WIDTH, &w);
111 //eglQuerySurface(display, surface, EGL_HEIGHT, &h);
113 window->Window.pContext.egl.Surface = surface;
117 * Closes a window, destroying the frame and OpenGL context
119 void fghPlatformCloseWindowEGL( SFG_Window* window )
121 eglMakeCurrent(fgDisplay.pDisplay.egl.Display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
122 if (window->Window.Context != EGL_NO_CONTEXT) {
123 eglDestroyContext(fgDisplay.pDisplay.egl.Display, window->Window.Context);
124 window->Window.Context = EGL_NO_CONTEXT;
127 if (window->Window.pContext.egl.Surface != EGL_NO_SURFACE) {
128 eglDestroySurface(fgDisplay.pDisplay.egl.Display, window->Window.pContext.egl.Surface);
129 window->Window.pContext.egl.Surface = EGL_NO_SURFACE;