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#include "gl4java_drawable_X11SunJDK13GLDrawableFactory.h"
#include "OpenGL_X11_common.h"
JNIEXPORT jlong JNICALL
Java_gl4java_drawable_X11SunJDK13GLDrawableFactory_glXChooseVisualID
(JNIEnv *env,
jclass unused,
jobject capsObj, jboolean verbose)
{
Display *disp = NULL;
int screen = 0;
XVisualInfo * visual=NULL;
int visualAttribList[32];
int done=0;
jboolean ok;
GLCapabilities glCaps;
int accumTestDone=0;
ok = javaGLCapabilities2NativeGLCapabilities ( env,
capsObj, &glCaps );
if(JNI_TRUE!=ok)
{
fprintf(stderr,"GL4Java X11SunJDK13GLDrawableFactory ERROR: gl4java/GLCapabilities fields not accessible\n");
fflush(stderr);
return JNI_FALSE;
}
/* JAU: What the hell ..
The java given display is not alway functional .. ?
If running without this ugly thing,
the derived SimpleGLAnimApplet1 get's an X11 async reply
if the thing is initialized by the applet's init method !
jdk 1.4 does not support the getDisplay() method anyway ..
*/
disp = XOpenDisplay( NULL );
screen = DefaultScreen( disp );
if(JNI_TRUE==verbose)
fprintf(stdout," display=%p, screen=%d\n", disp, (int)screen);
while(!done && visual==NULL)
{
(void) setVisualAttribListByGLCapabilities( visualAttribList, &glCaps);
if(JNI_TRUE==verbose)
{
fprintf(stdout, "X11DrawableFactory.glXChooseVisual: try capabilities:\n");
printGLCapabilities ( &glCaps );
}
visual = disp__glXChooseVisual( disp, screen, visualAttribList );
if(JNI_TRUE==verbose)
{
if(visual!=NULL)
{
fprintf(stdout, "X11DrawableFactory.glXChooseVisual: found visual(ID:%d(0x%X)):\n",
(int) visual->visualid,
(int) visual->visualid);
printVisualInfo ( disp, visual);
}
fflush(stdout);
}
/**
* Falling-Back the exact (min. requirement) parameters ..
*/
if(visual==NULL)
{
if(glCaps.stereo==STEREO_ON) {
glCaps.stereo=STEREO_OFF;
} else if(glCaps.stencilBits>32) {
glCaps.stencilBits=32;
} else if(glCaps.stencilBits>16) {
glCaps.stencilBits=16;
} else if(glCaps.stencilBits>8) {
glCaps.stencilBits=8;
} else if(glCaps.stencilBits>0) {
glCaps.stencilBits=0;
} else if( glCaps.alphaBits>0 ||
glCaps.accumAlphaBits>0
)
{
glCaps.alphaBits=0;
glCaps.accumAlphaBits=0;
} else if( accumTestDone==0 &&
( glCaps.accumRedBits==0 ||
glCaps.accumGreenBits==0 ||
glCaps.accumBlueBits==0
)
)
{
glCaps.accumRedBits=1;
glCaps.accumGreenBits=1;
glCaps.accumBlueBits=1;
} else if( glCaps.accumRedBits>0 ||
glCaps.accumGreenBits>0 ||
glCaps.accumBlueBits>0
)
{
glCaps.accumRedBits=0;
glCaps.accumGreenBits=0;
glCaps.accumBlueBits=0;
accumTestDone=1;
} else if(glCaps.buffer==BUFFER_DOUBLE) {
glCaps.buffer=BUFFER_SINGLE;
} else done=1; /* forget it .. */
}
}
if(visual==NULL)
{
fprintf(stdout, "X11DrawableFactory.glXChooseVisual: no visual\n");
return 0;
}
(void ) setGLCapabilities ( disp, visual, &glCaps );
if(JNI_TRUE==verbose)
{
fprintf(stdout,"X11DrawableFactory.glXChooseVisual: writing capabilities to GLContext's java object\n");
fflush(stdout);
}
(void) nativeGLCapabilities2JavaGLCapabilities
(env, capsObj, &glCaps);
/* JAU: see above .. */
XCloseDisplay( disp );
return (jlong) (visual->visualid);
}
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