wm_subwindow.c

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. 
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * Contributor(s): 2007 Blender Foundation (refactor)
 *
 * ***** END GPL LICENSE BLOCK *****
 *
 *
 * Subwindow opengl handling. 
 * BTW: subwindows open/close in X11 are way too slow, tried it, and choose for my own system... (ton)
 * 
 */

#include <string.h>

#include "MEM_guardedalloc.h"

#include "DNA_windowmanager_types.h"
#include "DNA_screen_types.h"

#include "BLI_blenlib.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"


#include "BKE_context.h"
#include "BKE_global.h"

#include "BIF_gl.h"

#include "GPU_extensions.h"

#include "WM_api.h"
#include "wm_subwindow.h"
#include "wm_window.h"

/* wmSubWindow stored in wmWindow... but not exposed outside this C file */
/* it seems a bit redundant (area regions can store it too, but we keep it
   because we can store all kind of future opengl fanciness here */

/* we use indices and array because:
   - index has safety, no pointers from this C file hanging around
   - fast lookups of indices with array, list would give overhead
   - old code used it this way...
   - keep option open to have 2 screens using same window
*/

typedef struct wmSubWindow {
    struct wmSubWindow *next, *prev;
    
    rcti winrct;
    int swinid;
} wmSubWindow;


/* ******************* open, free, set, get data ******************** */

/* not subwindow itself */
static void wm_subwindow_free(wmSubWindow *UNUSED(swin))
{
    /* future fancy stuff */
}

void wm_subwindows_free(wmWindow *win)
{
    wmSubWindow *swin;
    
    for(swin= win->subwindows.first; swin; swin= swin->next)
        wm_subwindow_free(swin);
    
    BLI_freelistN(&win->subwindows);
}


int wm_subwindow_get(wmWindow *win) 
{
    if(win->curswin)
        return win->curswin->swinid;
    return 0;
}

static wmSubWindow *swin_from_swinid(wmWindow *win, int swinid)
{
    wmSubWindow *swin;
    
    for(swin= win->subwindows.first; swin; swin= swin->next)
        if(swin->swinid==swinid)
            break;
    return swin;
}

void wm_subwindow_getsize(wmWindow *win, int swinid, int *x, int *y) 
{
    wmSubWindow *swin= swin_from_swinid(win, swinid);

    if(swin) {
        *x= swin->winrct.xmax - swin->winrct.xmin + 1;
        *y= swin->winrct.ymax - swin->winrct.ymin + 1;
    }
}

void wm_subwindow_getorigin(wmWindow *win, int swinid, int *x, int *y)
{
    wmSubWindow *swin= swin_from_swinid(win, swinid);

    if(swin) {
        *x= swin->winrct.xmin;
        *y= swin->winrct.ymin;
    }
}

void wm_subwindow_getmatrix(wmWindow *win, int swinid, float mat[][4])
{
    wmSubWindow *swin= swin_from_swinid(win, swinid);

    if(swin) {
        /* used by UI, should find a better way to get the matrix there */
        if(swinid == win->screen->mainwin) {
            int width, height;

            wm_subwindow_getsize(win, swin->swinid, &width, &height);
            orthographic_m4(mat, -0.375f, (float)width-0.375f, -0.375f, (float)height-0.375f, -100, 100);
        }
        else
            glGetFloatv(GL_PROJECTION_MATRIX, (float*)mat);
    }
}

/* always sets pixel-precise 2D window/view matrices */
/* coords is in whole pixels. xmin = 15, xmax= 16: means window is 2 pix big */
int wm_subwindow_open(wmWindow *win, rcti *winrct)
{
    wmSubWindow *swin;
    int width, height;
    int freewinid= 1;
    
    for(swin= win->subwindows.first; swin; swin= swin->next)
        if(freewinid <= swin->swinid)
            freewinid= swin->swinid+1;

    win->curswin= swin= MEM_callocN(sizeof(wmSubWindow), "swinopen");
    BLI_addtail(&win->subwindows, swin);
    
    if(G.f & G_DEBUG) printf("swin %d added\n", freewinid);
    swin->swinid= freewinid;
    swin->winrct= *winrct;

    /* and we appy it all right away */
    wmSubWindowSet(win, swin->swinid);
    
    /* extra service */
    wm_subwindow_getsize(win, swin->swinid, &width, &height);
    wmOrtho2(-0.375f, (float)width-0.375f, -0.375f, (float)height-0.375f);
    glLoadIdentity();

    return swin->swinid;
}


void wm_subwindow_close(wmWindow *win, int swinid)
{
    wmSubWindow *swin= swin_from_swinid(win, swinid);

    if (swin) {
        if (swin==win->curswin)
            win->curswin= NULL;
        wm_subwindow_free(swin);
        BLI_remlink(&win->subwindows, swin);
        MEM_freeN(swin);
    } 
    else {
        printf("wm_subwindow_close: Internal error, bad winid: %d\n", swinid);
    }

}

/* pixels go from 0-99 for a 100 pixel window */
void wm_subwindow_position(wmWindow *win, int swinid, rcti *winrct)
{
    wmSubWindow *swin= swin_from_swinid(win, swinid);
    
    if(swin) {
        int width, height;
        
        swin->winrct= *winrct;
        
        /* CRITICAL, this clamping ensures that
            * the viewport never goes outside the screen
            * edges (assuming the x, y coords aren't
                     * outside). This caused a hardware lock
            * on Matrox cards if it happens.
            * 
            * Really Blender should never _ever_ try
            * to do such a thing, but just to be safe
            * clamp it anyway (or fix the bScreen
            * scaling routine, and be damn sure you
            * fixed it). - zr  (2001!)
            */
        
        if (swin->winrct.xmax > win->sizex)
            swin->winrct.xmax= win->sizex;
        if (swin->winrct.ymax > win->sizey)
            swin->winrct.ymax= win->sizey;
        
        /* extra service */
        wmSubWindowSet(win, swinid);
        wm_subwindow_getsize(win, swinid, &width, &height);
        wmOrtho2(-0.375f, (float)width-0.375f, -0.375f, (float)height-0.375f);
    }
    else {
        printf("wm_subwindow_position: Internal error, bad winid: %d\n", swinid);
    }
}

/* ---------------- WM versions of OpenGL calls, using glBlah() syntax ------------------------ */
/* ----------------- exported in WM_api.h ------------------------------------------------------ */

/* internal state, no threaded opengl! XXX */
static wmWindow *_curwindow= NULL;
static wmSubWindow *_curswin= NULL;

void wmSubWindowScissorSet(wmWindow *win, int swinid, rcti *srct)
{
    int width, height;
    _curswin= swin_from_swinid(win, swinid);
    
    if(_curswin==NULL) {
        printf("wmSubWindowSet %d: doesn't exist\n", swinid);
        return;
    }
    
    win->curswin= _curswin;
    _curwindow= win;
    
    width= _curswin->winrct.xmax - _curswin->winrct.xmin + 1;
    height= _curswin->winrct.ymax - _curswin->winrct.ymin + 1;
    glViewport(_curswin->winrct.xmin, _curswin->winrct.ymin, width, height);

    if(srct) {
        width= srct->xmax - srct->xmin + 1;
        height= srct->ymax - srct->ymin + 1;
        glScissor(srct->xmin, srct->ymin, width, height);
    }
    else
        glScissor(_curswin->winrct.xmin, _curswin->winrct.ymin, width, height);
    
    wmOrtho2(-0.375f, (float)width-0.375f, -0.375f, (float)height-0.375f);
    glLoadIdentity();

    glFlush();
}


/* enable the WM versions of opengl calls */
void wmSubWindowSet(wmWindow *win, int swinid)
{
    wmSubWindowScissorSet(win, swinid, NULL);
}

void wmFrustum(float x1, float x2, float y1, float y2, float n, float f)
{
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glFrustum(x1, x2, y1, y2, n, f);
    glMatrixMode(GL_MODELVIEW);
}

void wmOrtho(float x1, float x2, float y1, float y2, float n, float f)
{
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();

    glOrtho(x1, x2, y1, y2, n, f);

    glMatrixMode(GL_MODELVIEW);
}

void wmOrtho2(float x1, float x2, float y1, float y2)
{
    /* prevent opengl from generating errors */
    if(x1==x2) x2+=1.0f;
    if(y1==y2) y2+=1.0f;

    wmOrtho(x1, x2, y1, y2, -100, 100);
}

/* *************************** Framebuffer color depth, for selection codes ********************** */

#ifdef __APPLE__

/* apple seems to round colors to below and up on some configs */

unsigned int index_to_framebuffer(int index)
{
    unsigned int i= index;

    switch(GPU_color_depth()) {
    case 12:
        i= ((i & 0xF00)<<12) + ((i & 0xF0)<<8) + ((i & 0xF)<<4);
        /* sometimes dithering subtracts! */
        i |= 0x070707;
        break;
    case 15:
    case 16:
        i= ((i & 0x7C00)<<9) + ((i & 0x3E0)<<6) + ((i & 0x1F)<<3);
        i |= 0x030303;
        break;
    case 24:
        break;
    default:    // 18 bits... 
        i= ((i & 0x3F000)<<6) + ((i & 0xFC0)<<4) + ((i & 0x3F)<<2);
        i |= 0x010101;
        break;
    }
    
    return i;
}

#else

/* this is the old method as being in use for ages.... seems to work? colors are rounded to lower values */

unsigned int index_to_framebuffer(int index)
{
    unsigned int i= index;
    
    switch(GPU_color_depth()) {
        case 8:
            i= ((i & 48)<<18) + ((i & 12)<<12) + ((i & 3)<<6);
            i |= 0x3F3F3F;
            break;
        case 12:
            i= ((i & 0xF00)<<12) + ((i & 0xF0)<<8) + ((i & 0xF)<<4);
            /* sometimes dithering subtracts! */
            i |= 0x0F0F0F;
            break;
        case 15:
        case 16:
            i= ((i & 0x7C00)<<9) + ((i & 0x3E0)<<6) + ((i & 0x1F)<<3);
            i |= 0x070707;
            break;
        case 24:
            break;
        default:    // 18 bits... 
            i= ((i & 0x3F000)<<6) + ((i & 0xFC0)<<4) + ((i & 0x3F)<<2);
            i |= 0x030303;
            break;
    }
    
    return i;
}

#endif

void WM_set_framebuffer_index_color(int index)
{
    const int col= index_to_framebuffer(index);
    cpack(col);
}

int WM_framebuffer_to_index(unsigned int col)
{
    if (col==0) return 0;

    switch(GPU_color_depth()) {
    case 8:
        return ((col & 0xC00000)>>18) + ((col & 0xC000)>>12) + ((col & 0xC0)>>6);
    case 12:
        return ((col & 0xF00000)>>12) + ((col & 0xF000)>>8) + ((col & 0xF0)>>4);
    case 15:
    case 16:
        return ((col & 0xF80000)>>9) + ((col & 0xF800)>>6) + ((col & 0xF8)>>3);
    case 24:
        return col & 0xFFFFFF;
    default: // 18 bits...
        return ((col & 0xFC0000)>>6) + ((col & 0xFC00)>>4) + ((col & 0xFC)>>2);
    }       
}


/* ********** END MY WINDOW ************** */