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"
29 int fghChooseConfig(EGLConfig* config) {
30 const EGLint attribs[] = {
31 EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
32 #ifdef GL_ES_VERSION_2_0
34 * Khronos does not specify a EGL_OPENGL_ES3_BIT outside of the OpenGL extension "EGL_KHR_create_context". There are numerous references on the internet that
35 * say to use EGL_OPENGL_ES3_BIT, followed by many saying they can't find it in any headers. In fact, the offical updated specification for EGL does not have
36 * any references to OpenGL ES 3.0. Tests have shown that EGL_OPENGL_ES2_BIT will work with ES 3.0.
38 EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
39 #elif GL_VERSION_ES_CM_1_0 || GL_VERSION_ES_CL_1_0 || GL_VERSION_ES_CM_1_1 || GL_VERSION_ES_CL_1_1
40 EGL_RENDERABLE_TYPE, EGL_OPENGL_ES_BIT,
42 EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
44 #ifdef TARGET_HOST_BLACKBERRY
45 /* Only 888 and 565 seem to work. Based on
46 http://qt.gitorious.org/qt/qtbase/source/893deb1a93021cdfabe038cdf1869de33a60cbc9:src/plugins/platforms/qnx/qqnxglcontext.cpp and
47 https://twitter.com/BlackBerryDev/status/380720927475912706 */
56 EGL_ALPHA_SIZE, (fgState.DisplayMode & GLUT_ALPHA) ? 1 : 0,
57 EGL_DEPTH_SIZE, (fgState.DisplayMode & GLUT_DEPTH) ? 1 : 0,
58 EGL_STENCIL_SIZE, (fgState.DisplayMode & GLUT_STENCIL) ? 1 : 0,
59 EGL_SAMPLE_BUFFERS, (fgState.DisplayMode & GLUT_MULTISAMPLE) ? 1 : 0,
60 EGL_SAMPLES, (fgState.DisplayMode & GLUT_MULTISAMPLE) ? fgState.SampleNumber : 0,
65 if (!eglChooseConfig(fgDisplay.pDisplay.egl.Display,
66 attribs, config, 1, &num_config)) {
67 fgWarning("eglChooseConfig: error %x\n", eglGetError());
75 * Initialize an EGL context for the current display.
77 EGLContext fghCreateNewContextEGL( SFG_Window* window ) {
80 EGLDisplay eglDisplay = fgDisplay.pDisplay.egl.Display;
81 EGLConfig eglConfig = window->Window.pContext.egl.Config;
83 /* Ensure OpenGLES 2.0 context */
84 static EGLint ctx_attribs[] = {
85 #ifdef GL_ES_VERSION_2_0
86 EGL_CONTEXT_CLIENT_VERSION, 2,
87 #elif GL_VERSION_ES_CM_1_0 || GL_VERSION_ES_CL_1_0 || GL_VERSION_ES_CM_1_1 || GL_VERSION_ES_CL_1_1
88 EGL_CONTEXT_CLIENT_VERSION, 1,
92 #ifdef GL_ES_VERSION_2_0
94 * As GLES 3.0 is backwards compatible with GLES 2.0, we set 2.0 as default unless the user states a different version.
95 * This updates the context attributes and lets us check that the correct version was set when we query it after creation.
97 int gles2Ver = fgState.MajorVersion <= 2 ? 2 : fgState.MajorVersion;
98 ctx_attribs[1] = gles2Ver;
100 context = eglCreateContext(eglDisplay, eglConfig, EGL_NO_CONTEXT, ctx_attribs);
101 if (context == EGL_NO_CONTEXT) {
102 fgWarning("Cannot initialize EGL context, err=%x\n", eglGetError());
103 fghContextCreationError();
106 eglQueryContext(fgDisplay.pDisplay.egl.Display, context, EGL_CONTEXT_CLIENT_VERSION, &ver);
107 #ifdef GL_ES_VERSION_2_0
112 fgError("Wrong GLES major version: %d\n", ver);
117 void fgPlatformSetWindow ( SFG_Window *window )
119 if ( window != fgStructure.CurrentWindow && window) {
120 if (eglMakeCurrent(fgDisplay.pDisplay.egl.Display,
121 window->Window.pContext.egl.Surface,
122 window->Window.pContext.egl.Surface,
123 window->Window.Context) == EGL_FALSE)
124 fgError("eglMakeCurrent: err=%x\n", eglGetError());
129 * Really opens a window when handle is available
131 void fghPlatformOpenWindowEGL( SFG_Window* window )
133 EGLDisplay display = fgDisplay.pDisplay.egl.Display;
134 EGLConfig config = window->Window.pContext.egl.Config;
136 EGLSurface surface = eglCreateWindowSurface(display, config, window->Window.Handle, NULL);
137 if (surface == EGL_NO_SURFACE)
138 fgError("Cannot create EGL window surface, err=%x\n", eglGetError());
139 window->Window.pContext.egl.Surface = surface;
141 fgPlatformSetWindow(window);
144 /* eglQuerySurface(display, surface, EGL_WIDTH, &w); */
145 /* eglQuerySurface(display, surface, EGL_HEIGHT, &h); */
150 * Closes a window, destroying the frame and OpenGL context
152 void fghPlatformCloseWindowEGL( SFG_Window* window )
154 /* Based on fg_window_mswin fgPlatformCloseWindow */
155 if( fgStructure.CurrentWindow == window )
156 eglMakeCurrent(fgDisplay.pDisplay.egl.Display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
158 if (window->Window.Context != EGL_NO_CONTEXT) {
159 /* Step through the list of windows. If the rendering context is not being used by another window, then delete it */
161 GLboolean used = GL_FALSE;
164 for( iter = (SFG_Window*)fgStructure.Windows.First;
165 iter && used == GL_FALSE;
166 iter = (SFG_Window*)iter->Node.Next)
168 if( (iter->Window.Context == window->Window.Context) &&
174 eglDestroyContext(fgDisplay.pDisplay.egl.Display, window->Window.Context);
176 window->Window.Context = EGL_NO_CONTEXT;
179 if (window->Window.pContext.egl.Surface != EGL_NO_SURFACE) {
180 eglDestroySurface(fgDisplay.pDisplay.egl.Display, window->Window.pContext.egl.Surface);
181 window->Window.pContext.egl.Surface = EGL_NO_SURFACE;