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Workaround for glXChooseVisual() bug on some systems where a doublebuffer
visual is returned even when not requested. This occasionally prevented sliders
from being displayed (identified by Dennis Mikkelson).

/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */

/*
 * Copyright (C) 1990-93   Silicon Graphics, Inc.
 *
 _______________________________________________________________________
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 |
 |   $Revision: 1.2 $
 |
 |   Classes:
 |	_SoXtColorSlider
 |
 |   Author(s)	: Alain Dumesny
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */

#ifdef DEBUG
#include <stdio.h>
#endif

#include <Inventor/SbLinear.h>
#include <Inventor/SbColor.h>
#include "_SoXtUIRegion.h"
#include "_SoXtColorSlider.h"

#include <malloc.h>

#include <X11/StringDefs.h>
#include <X11/Intrinsic.h>
#include <Xm/Text.h>

#include <GL/gl.h>

////////////////////////////////////////////////////////////////////////
//
// Public constructor - build the widget right now
//
_SoXtColorSlider::_SoXtColorSlider(
    Widget parent,
    const char *name, 
    SbBool buildInsideParent, 
    _SoXtColorSlider::Type type)
	: _SoXtSlider(
	    parent,
	    name, 
	    buildInsideParent, 
	    FALSE) // tell slider not to build just yet  
//
////////////////////////////////////////////////////////////////////////
{
    // In this case, this component is what the app wants, so buildNow = TRUE
    constructorCommon(type, TRUE);
}

////////////////////////////////////////////////////////////////////////
//
// SoEXTENDER constructor - the subclass tells us whether to build or not
//
_SoXtColorSlider::_SoXtColorSlider(
    Widget parent,
    const char *name, 
    SbBool buildInsideParent, 
    _SoXtColorSlider::Type type,
    SbBool buildNow)
	: _SoXtSlider(
	    parent,
	    name, 
	    buildInsideParent, 
	    FALSE) // tell slider not to build just yet  
//
////////////////////////////////////////////////////////////////////////
{
    // In this case, this component may be what the app wants, 
    // or it may want a subclass of this component. Pass along buildNow
    // as it was passed to us.
    constructorCommon(type, buildNow);
}

////////////////////////////////////////////////////////////////////////
//
// Called by the constructors
//
// private
//
void
_SoXtColorSlider::constructorCommon(_SoXtColorSlider::Type t, SbBool buildNow)
//
//////////////////////////////////////////////////////////////////////
{
    // init local vars
    WYSIWYGmode = FALSE;
    type = t;
    defaultColors = colors = NULL;
    geometry = NULL;
    color[0] = color[1] = color[2] = 0.0;
    
    // allocate memory for the color shading and geometry
    switch(type) {
	case RED_SLIDER: 
	case GREEN_SLIDER: 
	case BLUE_SLIDER:
	    colors = (SbColor *)malloc(2*sizeof(SbColor));
	    defaultColors = (SbColor *)malloc(2*sizeof(SbColor));
	    geometry = (SbVec2f *)malloc(4 * sizeof(SbVec2f));
	    break;
	case HUE_SLIDER: 
	    colors = (SbColor *)malloc(7*sizeof(SbColor));
	    defaultColors = (SbColor *)malloc(7*sizeof(SbColor));
	    geometry = (SbVec2f *)malloc(14 * sizeof(SbVec2f));
	    break;
	case SATURATION_SLIDER: 
	case VALUE_SLIDER: 
	case INTENSITY_SLIDER:
	    colors = (SbColor *)malloc(2*sizeof(SbColor));
	    defaultColors = colors; // since there is no fix default color
	    geometry = (SbVec2f *)malloc(4 * sizeof(SbVec2f));
	    break;
    }
    
    // ??? reset the geometry to prevent the window manager under PI a362
    // ??? to be killed (redrawing occurs even when window hasn't been
    // ??? mapped yet so those values would be bogus)
    int num = (type == HUE_SLIDER) ? 7 : 2;
    for (int i=0; i<num; i++) {
	geometry[2*i].setValue(0,0);
	geometry[2*i+1].setValue(0,0);
    }
    
    // now create the default colors
    makeDefaultColors();
    
    // add a callback to update the slider's baseColor whenever the
    // thumb is moved (unless it is INTENSITY_SLIDER, in which case
    // the base color is independent).
    if (type != INTENSITY_SLIDER)
	addValueChangedCallback(_SoXtColorSlider::sliderChangedCB, this);
    
    // Build the widget tree, and let SoXtComponent know about our base widget.
    if (buildNow) {
	Widget w = buildWidget(getParentWidget());
	setBaseWidget(w);
    }
}


////////////////////////////////////////////////////////////////////////
//
//    Destructor.
//

_SoXtColorSlider::~_SoXtColorSlider()
//
////////////////////////////////////////////////////////////////////////
{
    // check to make sure colors and defaultColors are not the same
    if (defaultColors != colors)
    	free(defaultColors);
    free(colors);
    free(geometry);
}


////////////////////////////////////////////////////////////////////////
//
//    This routine is used to specify the slider top color, which is 
//  reflected differently depending on the slider type.
//
// usage: public

void
_SoXtColorSlider::setBaseColor(
	const float c[3])
//
////////////////////////////////////////////////////////////////////////
{
    SbBool topChanged; // TRUE if the slider top region colors changed
    float newVal = getValue();
    
    switch(type) {
	
	case RED_SLIDER: 
	case HUE_SLIDER: 
	    topChanged = (WYSIWYGmode && (c[1]!=color[1] || c[2]!=color[2]));
	    newVal = c[0];
	    break;
	    
	case GREEN_SLIDER: 
	    topChanged = (WYSIWYGmode && (c[0]!=color[0] || c[2]!=color[2]));
	    newVal = c[1];
	    break;
	    
	case BLUE_SLIDER:
	    topChanged = (WYSIWYGmode && (c[0]!=color[0] || c[1]!=color[1]));
	    newVal = c[2];
	    break;
	    
	case SATURATION_SLIDER:
	    topChanged = (c[0]!=color[0] || (WYSIWYGmode && c[2]!=color[2]));
	    newVal = c[1];
	    break;
	    
	case VALUE_SLIDER:
	    topChanged = (c[0]!=color[0] || (WYSIWYGmode && c[1]!=color[1]));
	    newVal = c[2];
	    break;
	    
	case INTENSITY_SLIDER: 
	    topChanged = (c[0]!=color[0] || c[1]!=color[1] || c[2]!=color[2]);
	    // thumb is independent of color for intensity sliders
	    break;
    }
    
    // assign new color
    color[0] = c[0];
    color[1] = c[1];
    color[2] = c[2];
    
    if (topChanged)
	makeWYSIWYGcolors();
    
    // check for redraw needs
    if (newVal != getValue())
	setValue(newVal);
    else if (topChanged) {
	
	// only redraw the top region of the slider
	
	if (! isVisible())
	    return;
    	glXMakeCurrent(getDisplay(), getNormalWindow(), getNormalContext());
	drawSliderTopRegion();
    }
}


////////////////////////////////////////////////////////////////////////
//
//    This routine sets the WYSIWYG mode
//
// usage: public

void
_SoXtColorSlider::setWYSIWYG(SbBool flag)
//
////////////////////////////////////////////////////////////////////////
{
    if (WYSIWYGmode == flag)
	return;
    
    WYSIWYGmode = flag;
    
    // build WYSIWYG colors
    if (WYSIWYGmode || type==SATURATION_SLIDER || type==VALUE_SLIDER)
	makeWYSIWYGcolors();
    
    // only need to redraw top region
    if (! isVisible())
	return;
    glXMakeCurrent(getDisplay(), getNormalWindow(), getNormalContext());
    drawSliderTopRegion();
}


////////////////////////////////////////////////////////////////////////
//
//    This routine is called when window has changed size
//
// usage: virtual protected

void
_SoXtColorSlider::sizeChanged(const SbVec2s &newSize)
//
////////////////////////////////////////////////////////////////////////
{
    // first call base class routine
    _SoXtSlider::sizeChanged(newSize);
    
    SbVec2f *v = geometry;
    
    // now recompute things that depend on window size
    switch(type) {
	case HUE_SLIDER:
	    {
		// assign y values
		int i;
		for (i=0; i<7; i++) {
		    (*(v++))[1] = sly1;
		    (*(v++))[1] = sly2 + 1;
		}
		
		// assign x values
		float l = (slx2 - slx1 + 1) / 6.0;
		v = geometry;
		(*(v++))[0] = slx1;
		(*(v++))[0] = slx1;
		for (i=1; i<6; i++) {
		    (*(v++))[0] = slx1 + i*l;
		    (*(v++))[0] = slx1 + i*l;
		}
		(*(v++))[0] = slx2 + 1;
		(*v)[0] = slx2 + 1;
	    }
	    break;
	    
	default:    // everything else
	    (*v)[0] = (*(v+1))[0] = slx1;
	    (*(v+2))[0] = (*(v+3))[0] = slx2 + 1;
	    (*v)[1] = (*(v+3))[1] = sly1;
	    (*(v+1))[1] = (*(v+2))[1] = sly2 + 1;
	    break; 
    }
}


////////////////////////////////////////////////////////////////////////
//
//    This routine draws the slider top region. It is called by the 
//  _SoXtSlider::redraw routine.
//
// usage: virtual protected

void
_SoXtColorSlider::drawSliderTopRegion()
//
////////////////////////////////////////////////////////////////////////
{
    SbColor *c = (WYSIWYGmode) ? colors : defaultColors;
    SbVec2f *v = geometry;
    
    switch(type) {
	case HUE_SLIDER:
	    {
		glBegin(GL_QUAD_STRIP);
		for (int i=0; i<7; i++) {
		    glColor3fv((c++)->getValue());
		    glVertex2fv((v++)->getValue());
		    glVertex2fv((v++)->getValue());
		}
		glEnd();
	    }
	    break;
	    
	default:    // everything else!
		glBegin(GL_POLYGON);
		glColor3fv((c++)->getValue());
		glVertex2fv((v++)->getValue());
		glVertex2fv((v++)->getValue());
		glColor3fv(c->getValue());
		glVertex2fv((v++)->getValue());
		glVertex2fv((v)->getValue());
		glEnd();
	    break;
	    

    }
    
    SoDrawThumbUIRegion(thumx1, thumy1, thumx2, thumy2);
    
    if (isDoubleBuffer())
	glXSwapBuffers(getDisplay(), getNormalWindow());
    else
	glFlush();
}


////////////////////////////////////////////////////////////////////////
//
//    Build the default colors (non WYSIWYG colors)
//
// usage: private

void
_SoXtColorSlider::makeDefaultColors()
//
////////////////////////////////////////////////////////////////////////
{
    SbColor *c = defaultColors;
    
    switch(type) {
	case RED_SLIDER:
	    (*c)[0] = (*c)[1] = (*c)[2] = 0.0; c++;
	    (*c)[0] = 1.0;
	    (*c)[1] = (*c)[2] = 0.0;
	    break;
	    
	case GREEN_SLIDER:
	    (*c)[0] = (*c)[1] = (*c)[2] = 0.0; c++;
	    (*c)[0] = (*c)[2] = 0.0;
	    (*c)[1] = 1.0;
	    break;
	    
	case BLUE_SLIDER:
	    (*c)[0] = (*c)[1] = (*c)[2] = 0.0; c++;
	    (*c)[0] = (*c)[1] = 0.0;
	    (*c)[2] = 1.0;
	    break;
	    
	case HUE_SLIDER:
	    (*c)[0] = 1.0; (*c)[1] = (*c)[2] = 0.0; c++;
	    (*c)[0] = (*c)[1] = 1.0; (*c)[2] = 0.0; c++;
	    (*c)[0] = 0.0; (*c)[1] = 1.0; (*c)[2] = 0.0; c++;
	    (*c)[0] = 0.0; (*c)[1] = (*c)[2] = 1.0; c++;
	    (*c)[0] = (*c)[1] = 0.0; (*c)[2] = 1.0; c++;
	    (*c)[0] = 1.0; (*c)[1] = 0.0; (*c)[2] = 1.0; c++;
	    (*c)[0] = 1.0; (*c)[1] = (*c)[2] = 0.0;
	    break;
	    
	case SATURATION_SLIDER:
	case VALUE_SLIDER:
	case INTENSITY_SLIDER:
	    c->setValue(0., 0., 0.); c++;   // black...
	    c->setValue(0., 0., 0.);	    // to black (initially)
	    break;
    }
}


////////////////////////////////////////////////////////////////////////
//
//    builds the WYSIWYG colors.
//
// usage: private

void
_SoXtColorSlider::makeWYSIWYGcolors()
//
////////////////////////////////////////////////////////////////////////
{
    SbColor *c = colors;
    
    switch(type) {
	case RED_SLIDER: 
	    (*c)[0] = 0.0; (*(c+1))[0] = 1.0;
	    (*c)[1] = (*(c+1))[1] = color[1];
	    (*c)[2] = (*(c+1))[2] = color[2];
	    break;
	    
	case GREEN_SLIDER: 
	    (*c)[0] = (*(c+1))[0] = color[0];
	    (*c)[1] = 0.0; (*(c+1))[1] = 1.0;
	    (*c)[2] = (*(c+1))[2] = color[2];
	    break;
	    
	case BLUE_SLIDER:
	    (*c)[0] = (*(c+1))[0] = color[0];
	    (*c)[1] = (*(c+1))[1] = color[1];
	    (*c)[2] = 0.0; (*(c+1))[2] = 1.0;
	    break;
	    
	case HUE_SLIDER: 
	    {
		// convert to rgb
		SbColor rgb;
		rgb.setHSVValue(color);
		
		// get max and min values
		float max = color[2]; 
		float min = (rgb[0] < rgb[1]) ? 
		    ((rgb[0] < rgb[2]) ? rgb[0] : rgb[2]) : 
		    ((rgb[1] < rgb[2]) ? rgb[1] : rgb[2]);
		
		// now assign the 7 color ranges
		(*c)[0] = max; (*c)[1] = (*c)[2] = min; c++;
		(*c)[0] = (*c)[1] = max; (*c)[2] = min; c++;
		(*c)[0] = min; (*c)[1] = max; (*c)[2] = min; c++;
		(*c)[0] = min; (*c)[1] = (*c)[2] = max; c++;
		(*c)[0] = (*c)[1] = min; (*c)[2] = max; c++;
		(*c)[0] = max; (*c)[1] = min; (*c)[2] = max; c++;
		(*c)[0] = max; (*c)[1] = (*c)[2] = min;
	    }
	    break;
	    
	case SATURATION_SLIDER:
	    {
		float val = (WYSIWYGmode) ? color[2] : 1.0;
		
		// find starting color (max value, grey)
		(*c)[0] = (*c)[1] = (*c)[2] = val; c++;
		
		// find ending color
		float hsv[3];
		hsv[0] = color[0];
		hsv[1] = 1.0;
		hsv[2] = val;
		c->setHSVValue(hsv);
	    }
	    break;
	    
	case VALUE_SLIDER:
	    c++; // only change the 2nd color (the 1st is always black)
	    
	    // find ending color
	    if (color[1] == 0.0) {
		(*c)[0] = (*c)[1] = (*c)[2] = 1.0;
	    }
	    else {
		float hsv[3];
		hsv[0] = color[0];
		hsv[1] = (WYSIWYGmode) ? color[1] : 1.0;
		hsv[2] = 1.0;
		c->setHSVValue(hsv);
	    }
	    break;
	    
	case INTENSITY_SLIDER:
	    c++; // only change the 2nd color (the 1st is always black)
	    *c = color;
	    break;
    }
}



//
////////////////////////////////////////////////////////////////////////
// static callbacks stubs
////////////////////////////////////////////////////////////////////////
//


//
// called whenever the slider value changes. Make sure the 
// corresponding baseColor factor is also updated to reflect
// the new slider position.
//
void
_SoXtColorSlider::sliderChangedCB(void *pt, float val)
{
    _SoXtColorSlider *p = (_SoXtColorSlider *)pt;
    
    switch(p->type) {
	case RED_SLIDER: 
	case HUE_SLIDER:
	    p->color[0] = val;
	    break;
	case GREEN_SLIDER: 
	case SATURATION_SLIDER: 
	    p->color[1] = val;
	    break;
	case BLUE_SLIDER:
	case VALUE_SLIDER: 
	    p->color[2] = val;
	    break;
	case INTENSITY_SLIDER:
	    break; // nothing to do since thumnb is indep of baseColor
    }
}