/**
* Initialize an EGL context for the current display.
*/
EGLContext fghCreateNewContextEGL( SFG_Window* window ) {
EGLContext context;
EGLint ver = -1;
EGLDisplay eglDisplay = fgDisplay.pDisplay.egl.Display;
EGLConfig eglConfig = window->Window.pContext.egl.Config;
/* On GLES, user specifies the target version with glutInitContextVersion */
EGLint attributes[32];
int where = 0;
ATTRIB_VAL(EGL_CONTEXT_CLIENT_VERSION, fgState.MajorVersion);
ATTRIB(EGL_NONE);
context = eglCreateContext(eglDisplay, eglConfig, EGL_NO_CONTEXT, attributes);
if (context == EGL_NO_CONTEXT) {
fgWarning("Cannot initialize EGL context, err=%x\n", eglGetError());
fghContextCreationError();
}
eglQueryContext(fgDisplay.pDisplay.egl.Display, context, EGL_CONTEXT_CLIENT_VERSION, &ver);
if (ver != fgState.MajorVersion)
fgError("Wrong GLES major version: %d\n", ver);
return context;
}
static void fghFillContextAttributes( int *attributes ) {
int where = 0, contextFlags, contextProfile;
ATTRIB_VAL( WGL_CONTEXT_MAJOR_VERSION_ARB, fgState.MajorVersion );
ATTRIB_VAL( WGL_CONTEXT_MINOR_VERSION_ARB, fgState.MinorVersion );
contextFlags =
fghMapBit( fgState.ContextFlags, GLUT_DEBUG, WGL_CONTEXT_DEBUG_BIT_ARB ) |
fghMapBit( fgState.ContextFlags, GLUT_FORWARD_COMPATIBLE, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB );
if ( contextFlags != 0 ) {
ATTRIB_VAL( WGL_CONTEXT_FLAGS_ARB, contextFlags );
}
contextProfile =
fghMapBit( fgState.ContextProfile, GLUT_CORE_PROFILE, WGL_CONTEXT_CORE_PROFILE_BIT_ARB ) |
fghMapBit( fgState.ContextProfile, GLUT_COMPATIBILITY_PROFILE, WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB );
if ( contextProfile != 0 ) {
ATTRIB_VAL( WGL_CONTEXT_PROFILE_MASK_ARB, contextProfile );
}
ATTRIB( 0 );
}
int fghChooseConfig(EGLConfig* config) {
EGLint attributes[32];
int where = 0;
ATTRIB_VAL(EGL_SURFACE_TYPE, EGL_WINDOW_BIT);
if (fgState.MajorVersion >= 2) {
/*
* 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
* 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
* any references to OpenGL ES 3.0. Tests have shown that EGL_OPENGL_ES2_BIT will work with ES 3.0.
*/
ATTRIB_VAL(EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT);
} else {
ATTRIB_VAL(EGL_RENDERABLE_TYPE, EGL_OPENGL_ES_BIT);
}
/* Technically it's possible to request a standard OpenGL (non-ES)
context, but currently our build system assumes EGL => GLES */
/* attribs[i++] = EGL_RENDERABLE_TYPE; */
/* attribs[i++] = EGL_OPENGL_BIT; */
#ifdef TARGET_HOST_BLACKBERRY
/* Only 888 and 565 seem to work. Based on
http://qt.gitorious.org/qt/qtbase/source/893deb1a93021cdfabe038cdf1869de33a60cbc9:src/plugins/platforms/qnx/qqnxglcontext.cpp and
https://twitter.com/BlackBerryDev/status/380720927475912706 */
ATTRIB_VAL(EGL_BLUE_SIZE, 8);
ATTRIB_VAL(EGL_GREEN_SIZE, 8);
ATTRIB_VAL(EGL_RED_SIZE, 8);
#else
ATTRIB_VAL(EGL_BLUE_SIZE, 1);
ATTRIB_VAL(EGL_GREEN_SIZE, 1);
ATTRIB_VAL(EGL_RED_SIZE, 1);
#endif
ATTRIB_VAL(EGL_ALPHA_SIZE, (fgState.DisplayMode & GLUT_ALPHA) ? 1 : 0);
ATTRIB_VAL(EGL_DEPTH_SIZE, (fgState.DisplayMode & GLUT_DEPTH) ? 1 : 0);
ATTRIB_VAL(EGL_STENCIL_SIZE, (fgState.DisplayMode & GLUT_STENCIL) ? 1 : 0);
ATTRIB_VAL(EGL_SAMPLE_BUFFERS, (fgState.DisplayMode & GLUT_MULTISAMPLE) ? 1 : 0);
ATTRIB_VAL(EGL_SAMPLES, (fgState.DisplayMode & GLUT_MULTISAMPLE) ? fgState.SampleNumber : 0);
ATTRIB(EGL_NONE);
EGLint num_config;
if (!eglChooseConfig(fgDisplay.pDisplay.egl.Display,
attributes, config, 1, &num_config)) {
fgWarning("eglChooseConfig: error %x\n", eglGetError());
return 0;
}
return 1;
}
XVisualInfo* fgChooseVisual( void )
{
#define BUFFER_SIZES 6
int bufferSize[BUFFER_SIZES] = { 16, 12, 8, 4, 2, 1 };
GLboolean wantIndexedMode = GL_FALSE;
int attributes[ 32 ];
int where = 0;
/* First we have to process the display mode settings... */
/*
* XXX Why is there a semi-colon in this #define? The code
* XXX that uses the macro seems to always add more semicolons...
*/
#define ATTRIB(a) attributes[where++]=a;
#define ATTRIB_VAL(a,v) {ATTRIB(a); ATTRIB(v);}
if( fgState.DisplayMode & GLUT_INDEX )
{
ATTRIB_VAL( GLX_BUFFER_SIZE, 8 );
wantIndexedMode = GL_TRUE;
}
else
{
ATTRIB( GLX_RGBA );
ATTRIB_VAL( GLX_RED_SIZE, 1 );
ATTRIB_VAL( GLX_GREEN_SIZE, 1 );
ATTRIB_VAL( GLX_BLUE_SIZE, 1 );
if( fgState.DisplayMode & GLUT_ALPHA )
ATTRIB_VAL( GLX_ALPHA_SIZE, 1 );
}
if( fgState.DisplayMode & GLUT_DOUBLE )
ATTRIB( GLX_DOUBLEBUFFER );
if( fgState.DisplayMode & GLUT_STEREO )
ATTRIB( GLX_STEREO );
if( fgState.DisplayMode & GLUT_DEPTH )
ATTRIB_VAL( GLX_DEPTH_SIZE, 1 );
if( fgState.DisplayMode & GLUT_STENCIL )
ATTRIB_VAL( GLX_STENCIL_SIZE, 1 );
if( fgState.DisplayMode & GLUT_ACCUM )
{
ATTRIB_VAL( GLX_ACCUM_RED_SIZE, 1 );
ATTRIB_VAL( GLX_ACCUM_GREEN_SIZE, 1 );
ATTRIB_VAL( GLX_ACCUM_BLUE_SIZE, 1 );
if( fgState.DisplayMode & GLUT_ALPHA )
ATTRIB_VAL( GLX_ACCUM_ALPHA_SIZE, 1 );
}
if( fgState.DisplayMode & GLUT_AUX1 )
ATTRIB_VAL( GLX_AUX_BUFFERS, 1 );
if( fgState.DisplayMode & GLUT_AUX2 )
ATTRIB_VAL( GLX_AUX_BUFFERS, 2 );
if( fgState.DisplayMode & GLUT_AUX3 )
ATTRIB_VAL( GLX_AUX_BUFFERS, 3 );
if( fgState.DisplayMode & GLUT_AUX4 )
ATTRIB_VAL( GLX_AUX_BUFFERS, 4 );
/* Push a null at the end of the list */
ATTRIB( None );
if( ! wantIndexedMode )
return glXChooseVisual( fgDisplay.Display, fgDisplay.Screen,
attributes );
else
{
XVisualInfo* visualInfo;
int i;
/*
* In indexed mode, we need to check how many bits of depth can we
* achieve. We do this by trying each possibility from the list
* given in the {bufferSize} array. If we match, we return to caller.
*/
for( i=0; i<BUFFER_SIZES; i++ )
{
attributes[ 1 ] = bufferSize[ i ];
visualInfo = glXChooseVisual( fgDisplay.Display, fgDisplay.Screen,
attributes );
if( visualInfo != NULL )
return visualInfo;
}
return NULL;
}
}
static void fghFillPixelFormatAttributes( int *attributes, const PIXELFORMATDESCRIPTOR *ppfd )
{
int where = 0;
ATTRIB_VAL( WGL_DRAW_TO_WINDOW_ARB, GL_TRUE );
ATTRIB_VAL( WGL_SUPPORT_OPENGL_ARB, GL_TRUE );
ATTRIB_VAL( WGL_ACCELERATION_ARB, WGL_FULL_ACCELERATION_ARB );
ATTRIB_VAL( WGL_COLOR_BITS_ARB, ppfd->cColorBits );
ATTRIB_VAL( WGL_ALPHA_BITS_ARB, ppfd->cAlphaBits );
ATTRIB_VAL( WGL_DEPTH_BITS_ARB, ppfd->cDepthBits );
ATTRIB_VAL( WGL_STENCIL_BITS_ARB, ppfd->cStencilBits );
ATTRIB_VAL( WGL_DOUBLE_BUFFER_ARB, ( fgState.DisplayMode & GLUT_DOUBLE ) != 0 );
if ( fgState.DisplayMode & GLUT_SRGB ) {
ATTRIB_VAL( WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB, TRUE );
}
ATTRIB_VAL( WGL_SAMPLE_BUFFERS_ARB, GL_TRUE );
ATTRIB_VAL( WGL_SAMPLES_ARB, fgState.SampleNumber );
ATTRIB( 0 );
}
