/* $XFree86: xc/programs/Xserver/GL/glx/glxutil.c,v 1.5 2001/03/21 16:29:37 dawes Exp $ */
/*
** License Applicability. Except to the extent portions of this file are
** made subject to an alternative license as permitted in the SGI Free
** Software License B, Version 1.1 (the "License"), the contents of this
** file are subject only to the provisions of the License. You may not use
** this file except in compliance with the License. You may obtain a copy
** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
** 
** http://oss.sgi.com/projects/FreeB
** 
** Note that, as provided in the License, the Software is distributed on an
** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
** 
** Original Code. The Original Code is: OpenGL Sample Implementation,
** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
** Copyright in any portions created by third parties is as indicated
** elsewhere herein. All Rights Reserved.
** 
** Additional Notice Provisions: The application programming interfaces
** established by SGI in conjunction with the Original Code are The
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
** Window System(R) (Version 1.3), released October 19, 1998. This software
** was created using the OpenGL(R) version 1.2.1 Sample Implementation
** published by SGI, but has not been independently verified as being
** compliant with the OpenGL(R) version 1.2.1 Specification.
**
*/

#define NEED_REPLIES
#define FONT_PCF
#include "glxserver.h"
#include <GL/glxtokens.h>
#include <unpack.h>
#include <pixmapstr.h>
#include <windowstr.h>
#include "glxutil.h"
#include "glxbuf.h"
#include "GL/glx_ansic.h"
#include "GL/internal/glcore.h"
#include "GL/glxint.h"
#include "glcontextmodes.h"

/************************************************************************/

void __glXNop(void) {}

/************************************************************************/

/* Memory Allocation for GLX */

void *
__glXMalloc(size_t size)
{
    void *addr;

    if (size == 0) {
	return NULL;
    }
    addr = (void *) xalloc(size);
    if (addr == NULL) {
	/* XXX: handle out of memory error */
	return NULL;
    }
    return addr;
}

void *
__glXCalloc(size_t numElements, size_t elementSize)
{
    void *addr;
    size_t size;

    if ((numElements == 0) || (elementSize == 0)) {
	return NULL;
    }
    size = numElements * elementSize;
    addr = (void *) xalloc(size);
    if (addr == NULL) {
	/* XXX: handle out of memory error */
	return NULL;
    }
    __glXMemset(addr, 0, size);
    return addr;
}

void *
__glXRealloc(void *addr, size_t newSize)
{
    void *newAddr;

    if (addr) {
	if (newSize == 0) {
	    xfree(addr);
	    return NULL;
	} else {
	    newAddr = xrealloc(addr, newSize);
	}
    } else {
	if (newSize == 0) {
	    return NULL;
	} else {
	    newAddr = xalloc(newSize);
	}
    }
    if (newAddr == NULL) {
	return NULL;	/* XXX: out of memory */
    }

    return newAddr;
}

void
__glXFree(void *addr)
{
    if (addr) {
	xfree(addr);
    }
}

/************************************************************************/
/* Context stuff */


/*
** associate a context with a drawable
*/
void
__glXAssociateContext(__GLXcontext *glxc)
{
    glxc->nextDrawPriv = glxc->drawPriv->drawGlxc;
    glxc->drawPriv->drawGlxc = glxc;

    __glXRefDrawablePrivate(glxc->drawPriv);
    

    glxc->nextReadPriv = glxc->readPriv->readGlxc;
    glxc->readPriv->readGlxc = glxc;

    __glXRefDrawablePrivate(glxc->readPriv);
}

/*
** Deassociate a context from a drawable
*/
void
__glXDeassociateContext(__GLXcontext *glxc)
{
    __GLXcontext *curr, *prev;

    prev = NULL;
    for ( curr = glxc->drawPriv->drawGlxc
	  ; curr != NULL
	  ; prev = curr, curr = curr->nextDrawPriv ) {
	if (curr == glxc) {
	    /* found context.  Deassociate. */
	    if (prev == NULL) {
		glxc->drawPriv->drawGlxc = curr->nextDrawPriv;
	    } else {
		prev->nextDrawPriv = curr->nextDrawPriv;
	    }
	    curr->nextDrawPriv = NULL;
	    __glXUnrefDrawablePrivate(glxc->drawPriv);
	    break;
	}
    }


    prev = NULL;
    for ( curr = glxc->readPriv->readGlxc
	  ; curr != NULL 
	  ; prev = curr, curr = curr->nextReadPriv ) {
	if (curr == glxc) {
	    /* found context.  Deassociate. */
	    if (prev == NULL) {
		glxc->readPriv->readGlxc = curr->nextReadPriv;
	    } else {
		prev->nextReadPriv = curr->nextReadPriv;
	    }
	    curr->nextReadPriv = NULL;
	    __glXUnrefDrawablePrivate(glxc->readPriv);
	    break;
	}
    }
}

/************************************************************************/

void
__glXGetDrawableSize(__GLdrawablePrivate *glPriv,
		     GLint *x, GLint *y, GLuint *width, GLuint *height)
{
    __GLXdrawablePrivate *glxPriv = (__GLXdrawablePrivate *)glPriv->other;

    if (glxPriv) {
	*x = glxPriv->xorigin;
	*y = glxPriv->yorigin;
	*width = glxPriv->width;
	*height = glxPriv->height;
    } else {
	*x = *y = *width = *height = 0;
    }
}

GLboolean
__glXResizeDrawable(__GLdrawablePrivate *glPriv)
{
    /* nothing to be done here */
    return GL_TRUE;
}


/*****************************************************************************/
/* accessing the drawable private */

static void
LockDP(__GLdrawablePrivate *glPriv, __GLcontext *gc)
{
    __GLinterface *glci = (__GLinterface *) gc;
    __GLXcontext *glxc = (__GLXcontext *) glci->imports.other;

    /* quick exit test */
    if ((glxc->pendingState &
	 (__GLX_PENDING_RESIZE |
	  __GLX_PENDING_DESTROY |
	  __GLX_PENDING_SWAP)) == 0x0)
	return;

    /* some pending state.  Deal with it */
    if (glxc->pendingState & __GLX_PENDING_RESIZE) {
	glxc->pendingState &= ~__GLX_PENDING_RESIZE;

	(*glci->exports.notifyResize)(gc);
	assert((glxc->pendingState & __GLX_PENDING_RESIZE) == 0x0);
    }
    if (glxc->pendingState & __GLX_PENDING_DESTROY) {
	glxc->pendingState &= ~__GLX_PENDING_DESTROY;

	assert(glxc->drawPriv->xorigin == 0);
	assert(glxc->drawPriv->yorigin == 0);
	assert(glxc->drawPriv->width == 0);
	assert(glxc->drawPriv->height == 0);
	assert(glxc->readPriv->xorigin == 0);
	assert(glxc->readPriv->yorigin == 0);
	assert(glxc->readPriv->width == 0);
	assert(glxc->readPriv->height == 0);
	(*glci->exports.notifyDestroy)(gc);
	__glXDeassociateContext(glxc);
	assert((glxc->pendingState & __GLX_PENDING_DESTROY) == 0x0);
    }
    if (glxc->pendingState & __GLX_PENDING_SWAP) {

	glxc->pendingState &= ~__GLX_PENDING_SWAP;

	(*glci->exports.notifySwapBuffers)(gc);
	assert((glxc->pendingState & __GLX_PENDING_SWAP) == 0x0);
    }
}

static void
UnlockDP(__GLdrawablePrivate *glPriv)
{
}

/*****************************************************************************/
/* Drawable private stuff */

void
__glXRefDrawablePrivate(__GLXdrawablePrivate *glxPriv)
{
    glxPriv->refCount++;
}

void
__glXUnrefDrawablePrivate(__GLXdrawablePrivate *glxPriv)
{
    glxPriv->refCount--;
    if (glxPriv->refCount == 0) {
	__glXDestroyDrawablePrivate(glxPriv);
    }
}

__GLXdrawablePrivate *
__glXCreateDrawablePrivate(DrawablePtr pDraw, XID drawId,
			   __GLcontextModes *modes)
{
    __GLXdrawablePrivate *glxPriv;
    __GLdrawablePrivate *glPriv;
    __GLXscreenInfo *pGlxScreen;

    glxPriv = (__GLXdrawablePrivate *) __glXMalloc(sizeof(*glxPriv));
    __glXMemset(glxPriv, 0, sizeof(__GLXdrawablePrivate));

    glxPriv->type = pDraw->type;
    glxPriv->pDraw = pDraw;
    glxPriv->drawId = drawId;

    /* if not a pixmap, lookup will fail, so pGlxPixmap will be NULL */
    glxPriv->pGlxPixmap = (__GLXpixmap *) 
	LookupIDByType(drawId, __glXPixmapRes);
    /* since we are creating the drawablePrivate, drawId should be new */
    if (!AddResource(drawId, __glXDrawableRes, glxPriv)) {
	/* oops! */
	__glXFree(glxPriv);
	return NULL;
    }

    /* fill up glPriv */
    glPriv = &glxPriv->glPriv;
    glPriv->modes = (__GLcontextModes *) __glXMalloc(sizeof(__GLcontextModes));
    *glPriv->modes = *modes;
    glPriv->malloc = __glXMalloc;
    glPriv->calloc = __glXCalloc;
    glPriv->realloc = __glXRealloc;
    glPriv->free = __glXFree;
    glPriv->addSwapRect = NULL;
    glPriv->setClipRect = (void (*)(__GLdrawablePrivate *, GLint, GLint, GLsizei, GLsizei)) __glXNop;
    glPriv->lockDP = LockDP;
    glPriv->unlockDP = UnlockDP;
    glPriv->getDrawableSize = __glXGetDrawableSize;
    glPriv->resize = __glXResizeDrawable;
    glPriv->other = glxPriv;

    /* allocate a one-rect ownership region */
    glPriv->ownershipRegion.rects = 
	(__GLregionRect *)__glXCalloc(1, sizeof(__GLregionRect));
    glPriv->ownershipRegion.numRects = 1;

    glxPriv->freeBuffers = __glXFreeBuffers;
    glxPriv->updatePalette = (void (*)(__GLXdrawablePrivate *)) __glXNop;

    pGlxScreen = &__glXActiveScreens[pDraw->pScreen->myNum];

    if (glxPriv->type == DRAWABLE_WINDOW) {
	VisualID vid = wVisual((WindowPtr)pDraw);

	glxPriv->modes = _gl_context_modes_find_visual( pGlxScreen->modes, vid );
	__glXFBInitDrawable(glxPriv, modes);
    } else {
	glxPriv->modes = glxPriv->pGlxPixmap->modes;
	__glXPixInitDrawable(glxPriv, modes);
    }

    /* initialize the core's private buffer information */
    (*pGlxScreen->createBuffer)(glxPriv);

    return glxPriv;
}

GLboolean
__glXDestroyDrawablePrivate(__GLXdrawablePrivate *glxPriv)
{
    __GLdrawablePrivate *glPriv = &glxPriv->glPriv;

    /* remove the drawable from the drawable list */
    FreeResourceByType(glxPriv->drawId, __glXDrawableRes, FALSE);

    /* Have the core free any memory it may have attached to the drawable */
    if (glPriv->freePrivate) {
	(*glPriv->freePrivate)(glPriv);
    }

    /* Free any framebuffer memory attached to the drawable */
    if (glxPriv->freeBuffers) {
	(*glxPriv->freeBuffers)(glxPriv);
    }

    /* Free the drawable Private */
    __glXFree(glxPriv->glPriv.modes);
    __glXFree(glxPriv->glPriv.ownershipRegion.rects);
    __glXFree(glxPriv);

    return GL_TRUE;
}

__GLXdrawablePrivate *
__glXFindDrawablePrivate(XID drawId)
{
    __GLXdrawablePrivate *glxPriv;

    glxPriv = (__GLXdrawablePrivate *)LookupIDByType(drawId, __glXDrawableRes);

    return glxPriv;
}

__GLXdrawablePrivate *
__glXGetDrawablePrivate(DrawablePtr pDraw, XID drawId,
			__GLcontextModes *modes)
{
    __GLXdrawablePrivate *glxPriv;

    glxPriv = __glXFindDrawablePrivate(drawId);

    if (glxPriv == NULL) {
	glxPriv = __glXCreateDrawablePrivate(pDraw, drawId, modes);
	if (glxPriv) {
	    __glXRefDrawablePrivate(glxPriv);
	}
    }

    return glxPriv;
}

void
__glXCacheDrawableSize(__GLXdrawablePrivate *glxPriv)
{
    if (glxPriv) {
	if (glxPriv->pDraw) {
	    glxPriv->xorigin = glxPriv->pDraw->x;
	    glxPriv->yorigin = glxPriv->pDraw->y;
	    glxPriv->width = glxPriv->pDraw->width;
	    glxPriv->height = glxPriv->pDraw->height;
	}
    }
}

/*
** resize/move the drawable.  Called during the actual resize callback
** to update the drawable side of the buffers
*/
GLboolean
__glXResizeDrawableBuffers(__GLXdrawablePrivate *glxPriv)
{
    __GLdrawablePrivate *glPriv = &glxPriv->glPriv;
    GLint x, y;
    GLuint w, h;
#if defined(__GL_ALIGNED_BUFFERS)
    GLint xAlignment, yAlignment;
    GLint xOffset, yOffset;
    GLint xStart, xEnd;
    GLint yStart, yEnd;
    GLuint xAlignedMask, yAlignedMask;
#endif
    GLboolean status = GL_TRUE;

    __glXCacheDrawableSize(glxPriv);

    w = glxPriv->width;
    h = glxPriv->height;
    x = glxPriv->xorigin;
    y = glxPriv->yorigin;

#if defined(__GL_ALIGNED_BUFFERS)
    xAlignment = glPriv->xAlignment;
    yAlignment = glPriv->yAlignment;

    xOffset = x & (xAlignment-1);
    yOffset = y & (yAlignment-1);

    xAlignedMask = ~(xAlignment-1);
    yAlignedMask = ~(yAlignment-1);

    xStart = x; xEnd = x+w;
    yStart = y; yEnd = y+h;

    xStart &= xAlignedMask; 
    if (xEnd & ~xAlignedMask) { 
	xEnd = (xEnd&xAlignedMask) + xAlignment;
    }
    yStart &= yAlignedMask; 
    if (yEnd & ~yAlignedMask) { 
	yEnd = (yEnd&yAlignedMask) + yAlignment;
    }

    x = xStart; y = yStart;
    w = xEnd-xStart; h = yEnd-yStart;
#endif

    if ((x != glPriv->xOrigin) ||
	(y != glPriv->yOrigin) ||
#if defined(__GL_ALIGNED_BUFFERS)
	(xOffset != glPriv->xOffset) ||
	(yOffset != glPriv->yOffset) ||
#endif
	(w != glPriv->width) ||
	(h != glPriv->height) ||
	(!w && !h)) {
	/* set up the glPriv info */
	glPriv->width = w;
	glPriv->height = h;
	glPriv->xOrigin = x;
	glPriv->yOrigin = y;
#if defined(__GL_ALIGNED_BUFFERS)
	glPriv->xOffset = xOffset;
	glPriv->yOffset = yOffset;
#endif

	/* notify the buffers */
	status = __glXResizeBuffers(glPriv, x, y, w, h);
    }

    return status;
}

/************************************************************************/