/** @brief Obtain the system display and initialize EGL
* @param width : desired pixel width of the window (not used by all platforms)
* @param height : desired pixel height of the window (not used by all platforms)
* @return : 0 if the function passed, else 1
*/
int8_t EGL_Open( uint16_t width, uint16_t height )
{
EGLint eglMajorVer, eglMinorVer;
EGLBoolean result;
uint32_t configIndex = 0;
const char* output;
static const EGLint contextAttribs[] =
{
#if defined(USE_GLES2)
EGL_CONTEXT_CLIENT_VERSION, 2,
#endif
EGL_NONE
};
#if defined(DEBUG)
printf( "EGLport Warning: DEBUG is enabled which may effect performance\n" );
#endif
/* Check that system is not open */
if (eglDisplay != NULL || eglContext != NULL || eglSurface != NULL)
{
printf( "EGLport ERROR: EGL system is already open!\n" );
return 1;
}
/* Check for the cfg file to alternative settings */
OpenCfg( "eglport.cfg" );
/* Setup any platform specific bits */
Platform_Open();
printf( "EGLport: Opening EGL display\n" );
if (GetNativeDisplay() != 0)
{
printf( "EGLport ERROR: Unable to obtain native display!\n" );
return 1;
}
eglDisplay = peglGetDisplay( nativeDisplay );
if (eglDisplay == EGL_NO_DISPLAY)
{
CheckEGLErrors( __FILE__, __LINE__ );
printf( "EGLport ERROR: Unable to create EGL display.\n" );
return 1;
}
printf( "EGLport: Initializing\n" );
result = peglInitialize( eglDisplay, &eglMajorVer, &eglMinorVer );
if (result != EGL_TRUE )
{
CheckEGLErrors( __FILE__, __LINE__ );
printf( "EGLport ERROR: Unable to initialize EGL display.\n" );
return 1;
}
/* Get EGL Library Information */
printf( "EGL Implementation Version: Major %d Minor %d\n", eglMajorVer, eglMinorVer );
output = peglQueryString( eglDisplay, EGL_VENDOR );
printf( "EGL_VENDOR: %s\n", output );
output = peglQueryString( eglDisplay, EGL_VERSION );
printf( "EGL_VERSION: %s\n", output );
output = peglQueryString( eglDisplay, EGL_EXTENSIONS );
printf( "EGL_EXTENSIONS: %s\n", output );
if (FindEGLConfigs() != 0)
{
printf( "EGLport ERROR: Unable to configure EGL. See previous error.\n" );
return 1;
}
printf( "EGLport: Using Config %d\n", configIndex );
#if defined(EGL_VERSION_1_2)
/* Bind GLES and create the context */
printf( "EGLport: Binding API\n" );
result = peglBindAPI( EGL_OPENGL_ES_API );
if ( result == EGL_FALSE )
{
CheckEGLErrors( __FILE__, __LINE__ );
printf( "EGLport ERROR: Could not bind EGL API.\n" );
return 1;
}
#endif /* EGL_VERSION_1_2 */
printf( "EGLport: Creating Context\n" );
eglContext = peglCreateContext( eglDisplay, eglConfigs[configIndex], NULL, contextAttribs );
if (eglContext == EGL_NO_CONTEXT)
{
CheckEGLErrors( __FILE__, __LINE__ );
printf( "EGLport ERROR: Unable to create GLES context!\n");
return 1;
}
printf( "EGLport: Creating window surface\n" );
if (GetNativeWindow( width, height ) != 0)
{
printf( "EGLport ERROR: Unable to obtain native window!\n" );
return 1;
}
eglSurface = peglCreateWindowSurface( eglDisplay, eglConfigs[configIndex], nativeWindow, 0 );
if (eglSurface == EGL_NO_SURFACE)
{
CheckEGLErrors( __FILE__, __LINE__ );
printf( "EGLport ERROR: Unable to create EGL surface!\n" );
return 1;
}
printf( "EGLport: Making Current\n" );
result = peglMakeCurrent( eglDisplay, eglSurface, eglSurface, eglContext );
if (result != EGL_TRUE)
{
CheckEGLErrors( __FILE__, __LINE__ );
printf( "EGLport ERROR: Unable to make GLES context current\n" );
return 1;
}
{
EGLint color, depth, stencil;
eglGetConfigAttrib(eglDisplay, eglConfigs[configIndex], EGL_BUFFER_SIZE, &color);
eglGetConfigAttrib(eglDisplay, eglConfigs[configIndex], EGL_DEPTH_SIZE, &depth);
eglGetConfigAttrib(eglDisplay, eglConfigs[configIndex], EGL_STENCIL_SIZE, &stencil);
eglColorbits = (color==16)?5:8; //quick hack
eglDepthbits = depth;
eglStencilbits = stencil;
}
printf( "EGLport: Setting swap interval\n" );
peglSwapInterval( eglDisplay, (eglSettings[CFG_VSYNC] > 0) ? 1 : 0 );
printf( "EGLport: Complete\n" );
CheckEGLErrors( __FILE__, __LINE__ );
return 0;
}
/*===========================================================
Initialise OpenGL settings
===========================================================*/
int8_t ConfigureEGL(EGLConfig config)
{
EGLBoolean result;
#if defined(USE_GLES1)
static const EGLint s_contextAttribs = NULL;
#elif defined(USE_GLES2)
static const EGLint s_contextAttribs[] =
{
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
#else
#error Incorrect Opengl-ES Configuration for s_contextAttribs
#endif /* defined(USE_GLES1) */
// Cleanup in case of a reset
if (g_eglDisplay != NULL)
{
peglMakeCurrent( g_eglDisplay, NULL, NULL, EGL_NO_CONTEXT );
if (g_eglContext != NULL) {
peglDestroyContext( g_eglDisplay, g_eglContext );
}
if (g_eglSurface != NULL) {
peglDestroySurface( g_eglDisplay, g_eglSurface );
}
}
#if defined(EGL_VERSION_1_2)
// Bind GLES and create the context
printf( "EGL Binding API\n" );
peglBindAPI( EGL_OPENGL_ES_API );
if ( CheckEGLErrors( __FILE__, __LINE__ ) != 0 )
{
printf( "EGL ERROR: Could not bind EGL API.\n" );
return 1;
}
#endif /* defined(USE_EGL_SDL) */
printf( "EGL Creating Context\n" );
g_eglContext = peglCreateContext( g_eglDisplay, config, NULL, s_contextAttribs );
if (g_eglContext == EGL_NO_CONTEXT)
{
CheckEGLErrors( __FILE__, __LINE__ );
printf( "EGL ERROR: Unable to create GLES context!\n");
return 1;
}
#if defined(USE_EGL_RAW)
if (g_Window == NULL) {
g_Window = (NativeWindowType)malloc(16*1024);
if(g_Window == NULL) {
printf( "EGL ERROR: Memory for window Failed\n" );
return 1;
}
}
else
{
printf( "EGL Info: Memory for window already allocated\n" );
}
#elif defined(USE_EGL_SDL)
// Get the SDL window handle
SDL_SysWMinfo sysInfo; //Will hold our Window information
SDL_VERSION(&sysInfo.version); //Set SDL version
if(SDL_GetWMInfo(&sysInfo) <= 0)
{
printf( "EGL ERROR: Unable to get SDL window handle: %s\n", SDL_GetError() );
return 1;
}
g_Window = (NativeWindowType)sysInfo.info.x11.window;
#else
#error Incorrect EGL Configuration for g_Window
#endif /* defined(USE_EGL_RAW) */
printf( "EGL Creating window surface\n" );
g_eglSurface = peglCreateWindowSurface( g_eglDisplay, config, g_Window, 0 );
if (g_eglSurface == EGL_NO_SURFACE)
{
CheckEGLErrors( __FILE__, __LINE__ );
printf( "EGL ERROR: Unable to create EGL surface!\n" );
return 1;
}
printf( "EGL Making Current\n" );
result = peglMakeCurrent( g_eglDisplay, g_eglSurface, g_eglSurface, g_eglContext );
if (result != EGL_TRUE)
{
CheckEGLErrors( __FILE__, __LINE__ );
printf( "EGL ERROR: Unable to make GLES context current\n" );
return 1;
}
CheckEGLErrors( __FILE__, __LINE__ );
printf( "EGL Complete\n" );
return 0;
}