glxfb.c 5.11 KB
Newer Older
1
/* $XFree86$ */
Kaleb Keithley Keithley's avatar
Kaleb Keithley Keithley committed
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
/*
** 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.
**
*/

/*
** An implementation of a buffer which is part of the front buffer
*/

#include "glxserver.h"
#include "glxutil.h"
#include "glxfb.h"

#include <gcstruct.h>

/* so we don't include glmath.h */
extern GLuint __glFloorLog2(GLuint);

typedef struct __GLFBbufferInfoRec {
    GCPtr	pGC;
} __GLFBbufferInfo;

extern PixmapPtr __glXPrivPixGetPtr(__GLdrawableBuffer *);

/* ---------------------------------------------------------- */

static GLboolean
Resize(__GLdrawableBuffer *buf, 
       GLint x, GLint y, GLuint width, GLuint height,
       __GLdrawablePrivate *glPriv, GLuint bufferMask)
{
    buf->width = width;
    buf->height = height;
    buf->byteWidth = width * buf->elementSize;
    buf->outerWidth = width;

    return GL_TRUE;
}

static void
Lock(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
{
}

static void
Unlock(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
{
}

/*
** Do a swap buffer with
** a memory surface as a back buffer
** a FB surface as a front buffer
*/
GLboolean
__glXFBMemSwapBuffers(__GLXdrawablePrivate *glxPriv)
{
    __GLdrawablePrivate *glPriv = &glxPriv->glPriv;
    __GLdrawableBuffer *front = &glPriv->frontBuffer;
    __GLdrawableBuffer *back = &glPriv->backBuffer;
    __GLFBbufferInfo *bufferInfo;
    GCPtr pGC;
    GLint width, height, depth, pad;
    GLubyte *buf;

    bufferInfo = (__GLFBbufferInfo *) front->other;
    pGC = bufferInfo->pGC;

    width = back->width;
    height = back->height;
    depth = back->depth;
    buf = back->base;
    pad = back->outerWidth - back->width;	/* back buffer padding */
    /* adjust buffer padding. X wants left, GL has right */
    buf -= pad;

    ValidateGC(glxPriv->pDraw, pGC);
    (*pGC->ops->PutImage)(glxPriv->pDraw, pGC,
			 depth,
			 0, 0, width, height,
			 pad, ZPixmap,
			 (char *)buf);

    return GL_TRUE;
}

static void
Free(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
{
    __GLFBbufferInfo *bufferInfo;

    bufferInfo = (__GLFBbufferInfo *) buf->other;

    if (bufferInfo->pGC) {
	FreeScratchGC(bufferInfo->pGC);
    }

    __glXFree(bufferInfo);
    buf->other = NULL;
}

/*
** function to return the X GC of this buffer (to be used by DDX)
*/
GCPtr __glXFBGetGC(__GLdrawableBuffer *buf)
{
    __GLFBbufferInfo *bufferInfo;

    bufferInfo = (__GLFBbufferInfo *) buf->other;

    if (bufferInfo) {
	return bufferInfo->pGC;
    } else {
	return NULL;
    }
}


void
__glXInitFB(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv, GLint bits)
{
    __GLFBbufferInfo *bufferInfo;
    __GLXdrawablePrivate *glxPriv = (__GLXdrawablePrivate *) glPriv->other;
    GCPtr pGC;

    buf->depth = bits;
    buf->width = buf->height = 0;	/* to be filled during Update */
    buf->handle = buf->base = NULL;	/* to be filled during Update */
    buf->size = 0;
    buf->byteWidth = 0;
    buf->elementSize = ((bits-1) / 8) + 1;
    buf->elementSizeLog2 = __glFloorLog2(buf->elementSize);

    buf->resize = Resize;
    buf->lock = Lock;
    buf->unlock = Unlock;
    buf->fill = NULL;
    buf->free = Free;

    /* allocate local information */
    bufferInfo = (__GLFBbufferInfo *) __glXMalloc(sizeof(__GLFBbufferInfo));
    buf->other = (void *) bufferInfo;

    pGC = CreateScratchGC(glxPriv->pDraw->pScreen,
			  glxPriv->pDraw->depth);
    bufferInfo->pGC = pGC;
    (*pGC->funcs->ChangeClip)(pGC, CT_NONE, NULL, 0);
}