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authorBrian Paul <brian.paul@tungstengraphics.com>2003-08-22 20:11:43 +0000
committerBrian Paul <brian.paul@tungstengraphics.com>2003-08-22 20:11:43 +0000
commit5df82c82bd53db90eb72c5aad4dd20cf6f1116b1 (patch)
treef04fc69df71104df2a4cec03346abc3d4c3f4bbb /src/glx/mini/miniglx.c
parent1a84876d7907df90add3f59d3396ce0bbb905040 (diff)
patch to import Jon Smirl's work from Bitkeeper
Diffstat (limited to 'src/glx/mini/miniglx.c')
-rw-r--r--src/glx/mini/miniglx.c1975
1 files changed, 1975 insertions, 0 deletions
diff --git a/src/glx/mini/miniglx.c b/src/glx/mini/miniglx.c
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+++ b/src/glx/mini/miniglx.c
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+/**
+ * \file miniglx.c
+ * \brief Mini GLX interface functions.
+ * \author Brian Paul
+ *
+ * The Mini GLX interface is a subset of the GLX interface, plus a
+ * minimal set of Xlib functions.
+ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version: 5.0
+ *
+ * Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/* $Id: miniglx.c,v 1.1 2003/08/22 20:11:43 brianp Exp $ */
+
+/**
+ * \mainpage Mini GLX
+ *
+ * \section miniglxIntro Introduction
+ *
+ * The Mini GLX interface facilitates OpenGL rendering on embedded devices. The
+ * interface is a subset of the GLX interface, plus a minimal set of Xlib-like
+ * functions.
+ *
+ * Programs written to the Mini GLX specification should run unchanged
+ * on systems with the X Window System and the GLX extension (after
+ * recompilation). The intention is to allow flexibility for
+ * prototyping and testing.
+ *
+ * The files in the src/miniglx/ directory are compiled to build the
+ * libGL.so library. This is the library which applications link with.
+ * libGL.so in turn, loads the hardware-specific device driver.
+ *
+ *
+ * \section miniglxDoxygen About Doxygen
+ *
+ * For a list of all files, select <b>File List</b>. Choose a file from
+ * the list for a list of all functions in the file.
+ *
+ * For a list of all functions, types, constants, etc.
+ * select <b>File Members</b>.
+ *
+ *
+ * \section miniglxReferences References
+ *
+ * - <A HREF="file:../../docs/MiniGLX.html">Mini GLX Specification</A>,
+ * Tungsten Graphics, Inc.
+ * - OpenGL Graphics with the X Window System, Silicon Graphics, Inc.,
+ * ftp://ftp.sgi.com/opengl/doc/opengl1.2/glx1.3.ps
+ * - Xlib - C Language X Interface, X Consortium Standard, X Version 11,
+ * Release 6.4, ftp://ftp.x.org/pub/R6.4/xc/doc/hardcopy/X11/xlib.PS.gz
+ * - XFree86 Man pages, The XFree86 Project, Inc.,
+ * http://www.xfree86.org/current/manindex3.html
+ *
+ */
+
+/**
+ * \page datatypes Notes on the XVisualInfo, Visual, and __GLXvisualConfig data types
+ *
+ * -# X (unfortunately) has two (or three) data types which
+ * describe visuals. Ideally, there would just be one.
+ * -# We need the #__GLXvisualConfig type to augment #XVisualInfo and #Visual
+ * because we need to describe the GLX-specific attributes of visuals.
+ * -# In this interface there is a one-to-one-to-one correspondence between
+ * the three types and they're all interconnected.
+ * -# The #XVisualInfo type has a pointer to a #Visual. The #Visual structure
+ * (aka MiniGLXVisualRec) has a pointer to the #__GLXvisualConfig. The
+ * #Visual structure also has a pointer pointing back to the #XVisualInfo.
+ * -# The #XVisualInfo structure is the only one who's contents are public.
+ * -# The glXChooseVisual() and XGetVisualInfo() are the only functions that
+ * return #XVisualInfo structures. They can be freed with XFree(), though
+ * there is a small memory leak.
+ */
+
+
+#include <assert.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dlfcn.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <linux/kd.h>
+#include <linux/vt.h>
+
+#include "miniglxP.h"
+#include "dri.h"
+
+#include "glapi.h"
+#include "xf86drm.h"
+
+
+/**
+ * \brief Current GLX context.
+ *
+ * \sa glXGetCurrentContext().
+ */
+static GLXContext CurrentContext = NULL;
+
+
+
+static Display *SignalDisplay = 0;
+
+static void SwitchVT(int sig)
+{
+ fprintf(stderr, "SwitchVT %d dpy %p\n", sig, SignalDisplay);
+
+ if (SignalDisplay) {
+ SignalDisplay->vtSignalFlag = 1;
+ switch( sig )
+ {
+ case SIGUSR1: /* vt has been released */
+ SignalDisplay->haveVT = 0;
+ break;
+ case SIGUSR2: /* vt has been acquired */
+ SignalDisplay->haveVT = 1;
+ break;
+ }
+ }
+}
+
+/**********************************************************************/
+/** \name Framebuffer device functions */
+/**********************************************************************/
+/*@{*/
+
+/**
+ * \brief Do the first part of setting up the framebuffer device.
+ *
+ * \param dpy the display handle.
+ * \param use_vt use a VT for display or not
+ *
+ * \return GL_TRUE on success, or GL_FALSE on failure.
+ *
+ * \sa This is called during XOpenDisplay().
+ *
+ * \internal
+ * Gets the VT number, opens the respective console TTY device. Saves its state
+ * to restore when exiting and goes into graphics mode.
+ *
+ * Opens the framebuffer device and make a copy of the original variable screen
+ * information and gets the fixed screen information. Maps the framebuffer and
+ * MMIO region into the process address space.
+ */
+static GLboolean
+OpenFBDev( Display *dpy, int use_vt )
+{
+ char ttystr[1000];
+ int fd, vtnumber, ttyfd;
+
+ assert(dpy);
+
+ if (geteuid()) {
+ fprintf(stderr, "error: you need to be root\n");
+ return GL_FALSE;
+ }
+
+ if (use_vt) {
+
+ /* open /dev/tty0 and get the VT number */
+ if ((fd = open("/dev/tty0", O_WRONLY, 0)) < 0) {
+ fprintf(stderr, "error opening /dev/tty0\n");
+ return GL_FALSE;
+ }
+ if (ioctl(fd, VT_OPENQRY, &vtnumber) < 0 || vtnumber < 0) {
+ fprintf(stderr, "error: couldn't get a free vt\n");
+ return GL_FALSE;
+ }
+
+ fprintf(stderr, "*** got vt nr: %d\n", vtnumber);
+ close(fd);
+
+ /* open the console tty */
+ sprintf(ttystr, "/dev/tty%d", vtnumber); /* /dev/tty1-64 */
+ dpy->ConsoleFD = open(ttystr, O_RDWR | O_NDELAY, 0);
+ if (dpy->ConsoleFD < 0) {
+ fprintf(stderr, "error couldn't open console fd\n");
+ return GL_FALSE;
+ }
+
+ /* save current vt number */
+ {
+ struct vt_stat vts;
+ if (ioctl(dpy->ConsoleFD, VT_GETSTATE, &vts) == 0)
+ dpy->OriginalVT = vts.v_active;
+ }
+
+ /* disconnect from controlling tty */
+ ttyfd = open("/dev/tty", O_RDWR);
+ if (ttyfd >= 0) {
+ ioctl(ttyfd, TIOCNOTTY, 0);
+ close(ttyfd);
+ }
+
+ /* some magic to restore the vt when we exit */
+ {
+ struct vt_mode vt;
+ struct sigaction sig_tty;
+
+ /* Set-up tty signal handler to catch the signal we request below */
+ SignalDisplay = dpy;
+ memset( &sig_tty, 0, sizeof( sig_tty ) );
+ sig_tty.sa_handler = SwitchVT;
+ sigemptyset( &sig_tty.sa_mask );
+ if( sigaction( SIGUSR1, &sig_tty, &dpy->OrigSigUsr1 ) ||
+ sigaction( SIGUSR2, &sig_tty, &dpy->OrigSigUsr2 ) )
+ {
+ fprintf(stderr, "error: can't set up signal handler (%s)",
+ strerror(errno) );
+ return GL_FALSE;
+ }
+
+
+
+ vt.mode = VT_PROCESS;
+ vt.waitv = 0;
+ vt.relsig = SIGUSR1;
+ vt.acqsig = SIGUSR2;
+ if (ioctl(dpy->ConsoleFD, VT_SETMODE, &vt) < 0) {
+ fprintf(stderr, "error: ioctl(VT_SETMODE) failed: %s\n",
+ strerror(errno));
+ return GL_FALSE;
+ }
+
+
+ if (ioctl(dpy->ConsoleFD, VT_ACTIVATE, vtnumber) != 0)
+ printf("ioctl VT_ACTIVATE: %s\n", strerror(errno));
+ if (ioctl(dpy->ConsoleFD, VT_WAITACTIVE, vtnumber) != 0)
+ printf("ioctl VT_WAITACTIVE: %s\n", strerror(errno));
+
+ if (ioctl(dpy->ConsoleFD, VT_GETMODE, &vt) < 0) {
+ fprintf(stderr, "error: ioctl VT_GETMODE: %s\n", strerror(errno));
+ return GL_FALSE;
+ }
+
+
+
+ }
+
+ /* go into graphics mode */
+ if (ioctl(dpy->ConsoleFD, KDSETMODE, KD_GRAPHICS) < 0) {
+ fprintf(stderr, "error: ioctl(KDSETMODE, KD_GRAPHICS) failed: %s\n",
+ strerror(errno));
+ return GL_FALSE;
+ }
+ }
+
+ /* open the framebuffer device */
+ dpy->FrameBufferFD = open(dpy->fbdevDevice, O_RDWR);
+ if (dpy->FrameBufferFD < 0) {
+ fprintf(stderr, "Error opening /dev/fb0: %s\n", strerror(errno));
+ return GL_FALSE;
+ }
+
+ /* get the original variable screen info */
+ if (ioctl(dpy->FrameBufferFD, FBIOGET_VSCREENINFO, &dpy->OrigVarInfo)) {
+ fprintf(stderr, "error: ioctl(FBIOGET_VSCREENINFO) failed: %s\n",
+ strerror(errno));
+ return GL_FALSE;
+ }
+
+ /* make copy */
+ dpy->VarInfo = dpy->OrigVarInfo; /* structure copy */
+
+ /* Turn off hw accels (otherwise mmap of mmio region will be
+ * refused)
+ */
+ dpy->VarInfo.accel_flags = 0;
+ if (ioctl(dpy->FrameBufferFD, FBIOPUT_VSCREENINFO, &dpy->VarInfo)) {
+ fprintf(stderr, "error: ioctl(FBIOPUT_VSCREENINFO) failed: %s\n",
+ strerror(errno));
+ return GL_FALSE;
+ }
+
+
+
+ /* Get the fixed screen info */
+ if (ioctl(dpy->FrameBufferFD, FBIOGET_FSCREENINFO, &dpy->FixedInfo)) {
+ fprintf(stderr, "error: ioctl(FBIOGET_FSCREENINFO) failed: %s\n",
+ strerror(errno));
+ return GL_FALSE;
+ }
+
+
+
+ /* mmap the framebuffer into our address space */
+ dpy->driverContext.FBStart = dpy->FixedInfo.smem_start;
+ dpy->driverContext.FBSize = dpy->FixedInfo.smem_len;
+ dpy->driverContext.shared.fbSize = dpy->FixedInfo.smem_len;
+ dpy->driverContext.FBAddress = (caddr_t) mmap(0, /* start */
+ dpy->driverContext.shared.fbSize, /* bytes */
+ PROT_READ | PROT_WRITE, /* prot */
+ MAP_SHARED, /* flags */
+ dpy->FrameBufferFD, /* fd */
+ 0 /* offset */);
+ if (dpy->driverContext.FBAddress == (caddr_t) - 1) {
+ fprintf(stderr, "error: unable to mmap framebuffer: %s\n",
+ strerror(errno));
+ return GL_FALSE;
+ }
+
+ /* mmap the MMIO region into our address space */
+ dpy->driverContext.MMIOStart = dpy->FixedInfo.mmio_start;
+ dpy->driverContext.MMIOSize = dpy->FixedInfo.mmio_len;
+ dpy->driverContext.MMIOAddress = (caddr_t) mmap(0, /* start */
+ dpy->driverContext.MMIOSize, /* bytes */
+ PROT_READ | PROT_WRITE, /* prot */
+ MAP_SHARED, /* flags */
+ dpy->FrameBufferFD, /* fd */
+ dpy->FixedInfo.smem_len /* offset */);
+ if (dpy->driverContext.MMIOAddress == (caddr_t) - 1) {
+ fprintf(stderr, "error: unable to mmap mmio region: %s\n",
+ strerror(errno));
+ return GL_FALSE;
+ }
+
+ fprintf(stderr, "got MMIOAddress %p offset %d\n",
+ dpy->driverContext.MMIOAddress,
+ dpy->FixedInfo.smem_len);
+
+ return GL_TRUE;
+}
+
+
+
+
+/**
+ * \brief Setup up the desired framebuffer device mode.
+ *
+ * \param dpy the display handle.
+ *
+ * \return GL_TRUE on success, or GL_FALSE on failure.
+ *
+ * \sa This is called during __miniglx_StartServer().
+ *
+ * \internal
+ *
+ * Bumps the size of the window the the next supported mode. Sets the
+ * variable screen information according to the desired mode and asks
+ * the driver to validate the mode. Certifies that a DirectColor or
+ * TrueColor visual is used from the updated fixed screen information.
+ * In the case of DirectColor visuals, sets up an 'identity' colormap to
+ * mimic a TrueColor visual.
+ *
+ * Calls the driver hooks 'ValidateMode' and 'PostValidateMode' to
+ * allow the driver to make modifications to the chosen mode according
+ * to hardware constraints, or to save and restore videocard registers
+ * that may be clobbered by the fbdev driver.
+ *
+ * \todo Timings are hard-coded in the source for a set of supported modes.
+ */
+static GLboolean
+SetupFBDev( Display *dpy )
+{
+ int width, height;
+
+ assert(dpy);
+
+ width = dpy->driverContext.shared.virtualWidth;
+ height = dpy->driverContext.shared.virtualHeight;
+
+ /* Bump size up to next supported mode.
+ */
+ if (width <= 800 && height <= 600) {
+ width = 800; height = 600;
+ }
+ else if (width <= 1024 && height <= 768) {
+ width = 1024; height = 768;
+ }
+ else if (width <= 768 && height <= 1024) {
+ width = 768; height = 1024;
+ }
+ else if (width <= 1280 && height <= 1024) {
+ width = 1280; height = 1024;
+ }
+
+
+ dpy->driverContext.shared.virtualHeight = height;
+ dpy->driverContext.shared.virtualWidth = width;
+ dpy->driverContext.shared.fbStride = width * (dpy->driverContext.bpp / 8);
+
+ /* set the depth, resolution, etc */
+ dpy->VarInfo = dpy->OrigVarInfo;
+ dpy->VarInfo.bits_per_pixel = dpy->driverContext.bpp;
+ dpy->VarInfo.xres_virtual = dpy->driverContext.shared.virtualWidth;
+ dpy->VarInfo.yres_virtual = dpy->driverContext.shared.virtualHeight;
+ dpy->VarInfo.xres = width;
+ dpy->VarInfo.yres = height;
+ dpy->VarInfo.xoffset = 0;
+ dpy->VarInfo.yoffset = 0;
+ dpy->VarInfo.nonstd = 0;
+ dpy->VarInfo.vmode &= ~FB_VMODE_YWRAP; /* turn off scrolling */
+
+ if (dpy->VarInfo.bits_per_pixel == 32) {
+ dpy->VarInfo.red.offset = 16;
+ dpy->VarInfo.green.offset = 8;
+ dpy->VarInfo.blue.offset = 0;
+ dpy->VarInfo.transp.offset = 24;
+ dpy->VarInfo.red.length = 8;
+ dpy->VarInfo.green.length = 8;
+ dpy->VarInfo.blue.length = 8;
+ dpy->VarInfo.transp.length = 8;
+ }
+ else if (dpy->VarInfo.bits_per_pixel == 16) {
+ dpy->VarInfo.red.offset = 11;
+ dpy->VarInfo.green.offset = 5;
+ dpy->VarInfo.blue.offset = 0;
+ dpy->VarInfo.red.length = 5;
+ dpy->VarInfo.green.length = 6;
+ dpy->VarInfo.blue.length = 5;
+ dpy->VarInfo.transp.offset = 0;
+ dpy->VarInfo.transp.length = 0;
+ }
+ else {
+ fprintf(stderr, "Only 32bpp and 16bpp modes supported at the moment\n");
+ return 0;
+ }
+
+ if (!dpy->driver->validateMode( &dpy->driverContext )) {
+ fprintf(stderr, "Driver validateMode() failed\n");
+ return 0;
+ }
+
+ if (dpy->VarInfo.xres == 1280 &&
+ dpy->VarInfo.yres == 1024) {
+ /* timing values taken from /etc/fb.modes (1280x1024 @ 75Hz) */
+ dpy->VarInfo.pixclock = 7408;
+ dpy->VarInfo.left_margin = 248;
+ dpy->VarInfo.right_margin = 16;
+ dpy->VarInfo.upper_margin = 38;
+ dpy->VarInfo.lower_margin = 1;
+ dpy->VarInfo.hsync_len = 144;
+ dpy->VarInfo.vsync_len = 3;
+ }
+ else if (dpy->VarInfo.xres == 1024 &&
+ dpy->VarInfo.yres == 768) {
+ /* timing values taken from /etc/fb.modes (1024x768 @ 75Hz) */
+ dpy->VarInfo.pixclock = 12699;
+ dpy->VarInfo.left_margin = 176;
+ dpy->VarInfo.right_margin = 16;
+ dpy->VarInfo.upper_margin = 28;
+ dpy->VarInfo.lower_margin = 1;
+ dpy->VarInfo.hsync_len = 96;
+ dpy->VarInfo.vsync_len = 3;
+ }
+ else if (dpy->VarInfo.xres == 800 &&
+ dpy->VarInfo.yres == 600) {
+ /* timing values taken from /etc/fb.modes (800x600 @ 75Hz) */
+ dpy->VarInfo.pixclock = 20203;
+ dpy->VarInfo.left_margin = 160;
+ dpy->VarInfo.right_margin = 16;
+ dpy->VarInfo.upper_margin = 21;
+ dpy->VarInfo.lower_margin = 1;
+ dpy->VarInfo.hsync_len = 80;
+ dpy->VarInfo.vsync_len = 3;
+ }
+ else if (dpy->VarInfo.xres == 768 &&
+ dpy->VarInfo.yres == 1024) {
+ /* timing values for 768x1024 @ 75Hz */
+ dpy->VarInfo.pixclock = 11993;
+ dpy->VarInfo.left_margin = 136;
+ dpy->VarInfo.right_margin = 32;
+ dpy->VarInfo.upper_margin = 41;
+ dpy->VarInfo.lower_margin = 1;
+ dpy->VarInfo.hsync_len = 80;
+ dpy->VarInfo.vsync_len = 3;
+ }
+ else {
+ /* XXX need timings for other screen sizes */
+ fprintf(stderr, "XXXX screen size %d x %d not supported at this time!\n",
+ dpy->VarInfo.xres, dpy->VarInfo.yres);
+ return GL_FALSE;
+ }
+
+ fprintf(stderr, "[miniglx] Setting mode: visible %dx%d virtual %dx%dx%d\n",
+ dpy->VarInfo.xres, dpy->VarInfo.yres,
+ dpy->VarInfo.xres_virtual, dpy->VarInfo.yres_virtual,
+ dpy->VarInfo.bits_per_pixel);
+
+ /* set variable screen info */
+ if (ioctl(dpy->FrameBufferFD, FBIOPUT_VSCREENINFO, &dpy->VarInfo)) {
+ fprintf(stderr, "error: ioctl(FBIOPUT_VSCREENINFO) failed: %s\n",
+ strerror(errno));
+ return GL_FALSE;
+ }
+
+ /* get the variable screen info, in case it has been modified */
+ if (ioctl(dpy->FrameBufferFD, FBIOGET_VSCREENINFO, &dpy->VarInfo)) {
+ fprintf(stderr, "error: ioctl(FBIOGET_VSCREENINFO) failed: %s\n",
+ strerror(errno));
+ return GL_FALSE;
+ }
+
+
+ fprintf(stderr, "[miniglx] Readback mode: visible %dx%d virtual %dx%dx%d\n",
+ dpy->VarInfo.xres, dpy->VarInfo.yres,
+ dpy->VarInfo.xres_virtual, dpy->VarInfo.yres_virtual,
+ dpy->VarInfo.bits_per_pixel);
+
+ /* Get the fixed screen info */
+ if (ioctl(dpy->FrameBufferFD, FBIOGET_FSCREENINFO, &dpy->FixedInfo)) {
+ fprintf(stderr, "error: ioctl(FBIOGET_FSCREENINFO) failed: %s\n",
+ strerror(errno));
+ return GL_FALSE;
+ }
+
+ if (dpy->FixedInfo.visual != FB_VISUAL_TRUECOLOR &&
+ dpy->FixedInfo.visual != FB_VISUAL_DIRECTCOLOR) {
+ fprintf(stderr, "non-TRUECOLOR visuals not supported.\n");
+ return GL_FALSE;
+ }
+
+ if (dpy->FixedInfo.visual == FB_VISUAL_DIRECTCOLOR) {
+ struct fb_cmap cmap;
+ unsigned short red[256], green[256], blue[256];
+ int rcols = 1 << dpy->VarInfo.red.length;
+ int gcols = 1 << dpy->VarInfo.green.length;
+ int bcols = 1 << dpy->VarInfo.blue.length;
+ int i;
+
+ cmap.start = 0;
+ cmap.len = gcols;
+ cmap.red = red;
+ cmap.green = green;
+ cmap.blue = blue;
+ cmap.transp = NULL;
+
+ for (i = 0; i < rcols ; i++)
+ red[i] = (65536/(rcols-1)) * i;
+
+ for (i = 0; i < gcols ; i++)
+ green[i] = (65536/(gcols-1)) * i;
+
+ for (i = 0; i < bcols ; i++)
+ blue[i] = (65536/(bcols-1)) * i;
+
+ if (ioctl(dpy->FrameBufferFD, FBIOPUTCMAP, (void *) &cmap) < 0) {
+ fprintf(stderr, "ioctl(FBIOPUTCMAP) failed [%d]\n", i);
+ exit(1);
+ }
+ }
+
+ /* May need to restore regs fbdev has clobbered:
+ */
+ if (!dpy->driver->postValidateMode( &dpy->driverContext )) {
+ fprintf(stderr, "Driver postValidateMode() failed\n");
+ return 0;
+ }
+
+ return GL_TRUE;
+}
+
+
+/**
+ * \brief Restore the framebuffer device to state it was in before we started
+ *
+ * Undoes the work done by SetupFBDev().
+ *
+ * \param dpy the display handle.
+ *
+ * \return GL_TRUE on success, or GL_FALSE on failure.
+ *
+ * \sa Called from XDestroyWindow().
+ *
+ * \internal
+ * Restores the original variable screen info.
+ */
+static GLboolean
+RestoreFBDev( Display *dpy )
+{
+ /* restore original variable screen info */
+ if (ioctl(dpy->FrameBufferFD, FBIOPUT_VSCREENINFO, &dpy->OrigVarInfo)) {
+ fprintf(stderr, "ioctl(FBIOPUT_VSCREENINFO failed): %s\n",
+ strerror(errno));
+ return GL_FALSE;
+ }
+ dpy->VarInfo = dpy->OrigVarInfo;
+
+ return GL_TRUE;
+}
+
+
+/**
+ * \brief Close the framebuffer device.
+ *
+ * \param dpy the display handle.
+ *
+ * \sa Called from XCloseDisplay().
+ *
+ * \internal
+ * Unmaps the framebuffer and MMIO region. Restores the text mode and the
+ * original virtual terminal. Closes the console and framebuffer devices.
+ */
+static void
+CloseFBDev( Display *dpy )
+{
+ struct vt_mode VT;
+
+ munmap(dpy->driverContext.FBAddress, dpy->driverContext.FBSize);
+ munmap(dpy->driverContext.MMIOAddress, dpy->driverContext.MMIOSize);
+
+ if (dpy->ConsoleFD) {
+ /* restore text mode */
+ ioctl(dpy->ConsoleFD, KDSETMODE, KD_TEXT);
+
+ /* set vt */
+ if (ioctl(dpy->ConsoleFD, VT_GETMODE, &VT) != -1) {
+ VT.mode = VT_AUTO;
+ ioctl(dpy->ConsoleFD, VT_SETMODE, &VT);
+ }
+
+ /* restore original vt */
+ if (dpy->OriginalVT >= 0) {
+ ioctl(dpy->ConsoleFD, VT_ACTIVATE, dpy->OriginalVT);
+ dpy->OriginalVT = -1;
+ }
+
+ close(dpy->ConsoleFD);
+ }
+ close(dpy->FrameBufferFD);
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** \name Misc functions needed for DRI drivers */
+/**********************************************************************/
+/*@{*/
+
+/**
+ * \brief Find the DRI screen dependent methods associated with the display.
+ *
+ * \param dpy a display handle, as returned by XOpenDisplay().
+ * \param scrn the screen number. Not referenced.
+ *
+ * \returns a pointer to a __DRIscreenRec structure.
+ *
+ * \internal
+ * Returns the MiniGLXDisplayRec::driScreen attribute.
+ */
+__DRIscreen *
+__glXFindDRIScreen(Display *dpy, int scrn)
+{
+ (void) scrn;
+ return dpy->driScreen;
+}
+
+/**
+ * \brief Validate a drawable.
+ *
+ * \param dpy a display handle, as returned by XOpenDisplay().
+ * \param draw drawable to validate.
+ *
+ * \internal
+ * Since Mini GLX only supports one window, compares the specified drawable with
+ * the MiniGLXDisplayRec::TheWindow attribute.
+ */
+Bool
+__glXWindowExists(Display *dpy, GLXDrawable draw)
+{
+ if (dpy->TheWindow == draw)
+ return True;
+ else
+ return False;
+}
+
+/**
+ * \brief Get current thread ID.
+ *
+ * \return thread ID.
+ *
+ * \internal
+ * Always returns 0.
+ */
+/*unsigned long
+_glthread_GetID(void)
+{
+ return 0;
+}*/
+
+/*@}*/
+
+
+/**
+ * \brief Scan Linux /prog/bus/pci/devices file to determine hardware
+ * chipset based on supplied bus ID.
+ *
+ * \return probed chipset (non-zero) on success, zero otherwise.
+ *
+ * \internal
+ */
+static int get_chipset_from_busid( Display *dpy )
+{
+ char buf[0x200];
+ FILE *file;
+ const char *fname = "/proc/bus/pci/devices";
+ int retval = 0;
+
+ if (!(file = fopen(fname,"r"))) {
+ fprintf(stderr, "couldn't open %s: %s\n", fname, strerror(errno));
+ return 0;
+ }
+
+ while (fgets(buf, sizeof(buf)-1, file)) {
+ unsigned int nr, bus, dev, fn, vendor, device, encode;
+ nr = sscanf(buf, "%04x\t%04x%04x", &encode,
+ &vendor, &device);
+
+ bus = encode >> 16;
+ dev = (encode & 0xFF) >> 3;
+ fn = encode & 0x7;
+
+ if (nr != 3)
+ break;
+
+ if (bus == dpy->driverContext.pciBus &&
+ dev == dpy->driverContext.pciDevice &&
+ fn == dpy->driverContext.pciFunc) {
+ retval = device;
+ break;
+ }
+ }
+
+ fclose(file);
+
+ if (retval)
+ fprintf(stderr, "[miniglx] probed chipset 0x%x\n", retval);
+ else
+ fprintf(stderr, "[miniglx] failed to probe chipset\n");
+
+ return retval;
+}
+
+
+/**
+ * \brief Read settings from a configuration file.
+ *
+ * The configuration file is usually "/etc/miniglx.conf", but can be overridden
+ * with the MINIGLX_CONF environment variable.
+ *
+ * The format consists in \code option = value \endcode lines. The option names
+ * corresponds to the fields in MiniGLXDisplayRec.
+ *
+ * \param dpy the display handle as.
+ *
+ * \return non-zero on success, zero otherwise.
+ *
+ * \internal
+ * Sets some defaults. Opens and parses the the Mini GLX configuration file and
+ * fills in the MiniGLXDisplayRec field that corresponds for each option.
+ */
+static int __read_config_file( Display *dpy )
+{
+ FILE *file;
+ const char *fname;
+
+ /* Fallback/defaults
+ */
+ dpy->fbdevDevice = "/dev/fb0";
+ dpy->clientDriverName = "fb_dri.so";
+ dpy->driverContext.pciBus = 0;
+ dpy->driverContext.pciDevice = 0;
+ dpy->driverContext.pciFunc = 0;
+ dpy->driverContext.chipset = 0;
+ dpy->driverContext.pciBusID = 0;
+ dpy->driverContext.shared.virtualWidth = 1280;
+ dpy->driverContext.shared.virtualHeight = 1024;
+ dpy->driverContext.bpp = 32;
+ dpy->driverContext.cpp = 4;
+ dpy->rotateMode = 0;
+
+ fname = getenv("MINIGLX_CONF");
+ if (!fname) fname = "/etc/miniglx.conf";
+
+ file = fopen(fname, "r");
+ if (!file) {
+ fprintf(stderr, "couldn't open config file %s: %s\n", fname, strerror(errno));
+ return 0;
+ }
+
+
+ while (!feof(file)) {
+ char buf[81], *opt = buf, *val, *tmp1, *tmp2;
+ fgets(buf, sizeof(buf), file);
+
+ /* Parse 'opt = val' -- must be easier ways to do this.
+ */
+ while (isspace(*opt)) opt++;
+ val = opt;
+ if (*val == '#') continue; /* comment */
+ while (!isspace(*val) && *val != '=' && *val) val++;
+ tmp1 = val;
+ while (isspace(*val)) val++;
+ if (*val != '=') continue;
+ *tmp1 = 0;
+ val++;
+ while (isspace(*val)) val++;
+ tmp2 = val;
+ while (!isspace(*tmp2) && *tmp2 != '\n' && *tmp2) tmp2++;
+ *tmp2 = 0;
+
+
+ if (strcmp(opt, "fbdevDevice") == 0)
+ dpy->fbdevDevice = strdup(val);
+ else if (strcmp(opt, "clientDriverName") == 0)
+ dpy->clientDriverName = strdup(val);
+ else if (strcmp(opt, "rotateMode") == 0)
+ dpy->rotateMode = atoi(val) ? 1 : 0;
+ else if (strcmp(opt, "pciBusID") == 0) {
+ if (sscanf(val, "PCI:%d:%d:%d",
+ &dpy->driverContext.pciBus,
+ &dpy->driverContext.pciDevice,
+ &dpy->driverContext.pciFunc) != 3) {
+ fprintf(stderr, "malformed bus id: %s\n", val);
+ continue;
+ }
+ dpy->driverContext.pciBusID = strdup(val);
+ }
+ else if (strcmp(opt, "chipset") == 0) {
+ if (sscanf(val, "0x%x", &dpy->driverContext.chipset) != 1)
+ fprintf(stderr, "malformed chipset: %s\n", opt);
+ }
+ else if (strcmp(opt, "virtualWidth") == 0) {
+ if (sscanf(val, "%d", &dpy->driverContext.shared.virtualWidth) != 1)
+ fprintf(stderr, "malformed virtualWidth: %s\n", opt);
+ }
+ else if (strcmp(opt, "virtualHeight") == 0) {
+ if (sscanf(val, "%d", &dpy->driverContext.shared.virtualHeight) != 1)
+ fprintf(stderr, "malformed virutalHeight: %s\n", opt);
+ }
+ else if (strcmp(opt, "bpp") == 0) {
+ if (sscanf(val, "%d", &dpy->driverContext.bpp) != 1)
+ fprintf(stderr, "malformed bpp: %s\n", opt);
+ dpy->driverContext.cpp = dpy->driverContext.bpp / 8;
+ }
+ }
+
+ fclose(file);
+
+ if (dpy->driverContext.chipset == 0 && dpy->driverContext.pciBusID != 0)
+ dpy->driverContext.chipset = get_chipset_from_busid( dpy );
+
+ return 1;
+}
+
+static int InitDriver( Display *dpy )
+{
+ /*
+ * Begin DRI setup.
+ * We're kind of combining the per-display and per-screen information
+ * which was kept separate in XFree86/DRI's libGL.
+ */
+ dpy->dlHandle = dlopen(dpy->clientDriverName, RTLD_NOW | RTLD_GLOBAL);
+ if (!dpy->dlHandle) {
+ fprintf(stderr, "Unable to open %s: %s\n", dpy->clientDriverName,
+ dlerror());
+ return GL_FALSE;
+ }
+
+ /* Pull in Mini GLX specific hooks:
+ */
+ dpy->driver = (struct DRIDriverRec *) dlsym(dpy->dlHandle,
+ "__driDriver");
+ if (!dpy->driver) {
+ fprintf(stderr, "Couldn't find __driDriver in %s\n",
+ dpy->clientDriverName);
+ dlclose(dpy->dlHandle);
+ return GL_FALSE;
+ }
+
+ /* Pull in standard DRI client-side driver hooks:
+ */
+ dpy->createScreen = (driCreateScreenFunc*) dlsym(dpy->dlHandle,
+ "__driCreateScreen");
+ if (!dpy->createScreen) {
+ fprintf(stderr, "Couldn't find __driCreateScreen in %s\n",
+ dpy->clientDriverName);
+ dlclose(dpy->dlHandle);
+ return GL_FALSE;
+ }
+
+ return GL_TRUE;
+}
+
+
+/**********************************************************************/
+/** \name Public API functions (Xlib and GLX) */
+/**********************************************************************/
+/*@{*/
+
+
+/**
+ * \brief Initialize the graphics system.
+ *
+ * \param display_name currently ignored. It is recommended to pass it as NULL.
+ * \return a pointer to a #Display if the function is able to initialize
+ * the graphics system, NULL otherwise.
+ *
+ * Allocates a MiniGLXDisplayRec structure and fills in with information from a
+ * configuration file.
+ *
+ * Calls OpenFBDev() to open the framebuffer device and calls
+ * DRIDriverRec::initFBDev to do the client-side initialization on it.
+ *
+ * Loads the DRI driver and pulls in Mini GLX specific hooks into a
+ * DRIDriverRec structure, and the standard DRI \e __driCreateScreen hook.
+ * Asks the driver for a list of supported visuals. Performs the per-screen
+ * client-side initialization. Also setups the callbacks in the screen private
+ * information.
+ *
+ * Does the framebuffer device setup. Calls __miniglx_open_connections() to
+ * serve clients.
+ */
+Display *
+__miniglx_StartServer( const char *display_name )
+{
+ Display *dpy;
+ int use_vt = 0;
+
+ dpy = (Display *)calloc(1, sizeof(Display));
+ if (!dpy)
+ return NULL;
+
+ dpy->IsClient = False;
+
+ if (!__read_config_file( dpy )) {
+ fprintf(stderr, "Couldn't get configuration details\n");
+ free(dpy);
+ return NULL;
+ }
+
+ /* Open the fbdev device
+ */
+ if (!OpenFBDev(dpy, use_vt)) {
+ fprintf(stderr, "OpenFBDev failed\n");
+ free(dpy);
+ return NULL;
+ }
+
+ if (!InitDriver(dpy)) {
+ fprintf(stderr, "InitDriver failed\n");
+ free(dpy);
+ return NULL;
+ }
+
+ /* Ask the driver for a list of supported configs:
+ */
+ dpy->driver->initContextModes( &dpy->driverContext, &dpy->numModes, &dpy->modes );
+
+ /* Perform the initialization normally done in the X server
+ */
+ if (!dpy->driver->initFBDev( &dpy->driverContext )) {
+ fprintf(stderr, "%s: __driInitFBDev failed\n", __FUNCTION__);
+ dlclose(dpy->dlHandle);
+ return GL_FALSE;
+ }
+
+ /* do fbdev setup
+ */
+ if (!SetupFBDev(dpy)) {
+ fprintf(stderr, "SetupFBDev failed\n");
+ free(dpy);
+ return NULL;
+ }
+
+ /* unlock here if not using VT -- JDS */
+ if (!use_vt) {
+ if (dpy->driver->restoreHardware)
+ dpy->driver->restoreHardware( &dpy->driverContext );
+ DRM_UNLOCK( dpy->driverContext.drmFD,
+ dpy->driverContext.pSAREA,
+ dpy->driverContext.serverContext );
+ dpy->hwActive = 1;
+ }
+
+ /* Ready for clients:
+ */
+ if (!__miniglx_open_connections(dpy)) {
+ free(dpy);
+ return NULL;
+ }
+
+ return dpy;
+}
+
+
+/**
+ * \brief Initialize the graphics system.
+ *
+ * \param display_name currently ignored. It is recommended to pass it as NULL.
+ * \return a pointer to a #Display if the function is able to initialize
+ * the graphics system, NULL otherwise.
+ *
+ * Allocates a MiniGLXDisplayRec structure and fills in with information from a
+ * configuration file.
+ *
+ * Calls __miniglx_open_connections() to connect to the server.
+ *
+ * Loads the DRI driver and pulls in Mini GLX specific hooks into a
+ * DRIDriverRec structure, and the standard DRI \e __driCreateScreen hook.
+ * Asks the driver for a list of supported visuals. Performs the per-screen
+ * client-side initialization. Also setups the callbacks in the screen private
+ * information.
+ *
+ * \todo
+ * - read config file
+ * - what about virtualWidth, etc?
+ * - determine dpy->driverClientMsgSize,
+ * - allocate dpy->driverClientMsg
+ */
+Display *
+XOpenDisplay( const char *display_name )
+{
+ Display *dpy;
+
+ dpy = (Display *)calloc(1, sizeof(Display));
+ if (!dpy)
+ return NULL;
+
+ dpy->IsClient = True;
+
+ /* read config file
+ */
+ if (!__read_config_file( dpy )) {
+ fprintf(stderr, "Couldn't get configuration details\n");
+ free(dpy);
+ return NULL;
+ }
+
+ /* Connect to the server and receive driverClientMsg
+ */
+ if (!__miniglx_open_connections(dpy)) {
+ free(dpy);
+ return NULL;
+ }
+
+ /* dlopen the driver .so file
+ */
+ if (!InitDriver(dpy)) {
+ fprintf(stderr, "InitDriver failed\n");
+ free(dpy);
+ return NULL;
+ }
+
+ /* Ask the driver for a list of supported configs:
+ */
+ dpy->driver->initContextModes( &dpy->driverContext, &dpy->numModes, &dpy->modes );
+
+ /* Perform the client-side initialization.
+ *
+ * Clearly there is a limit of one on the number of windows in
+ * existence at any time.
+ *
+ * Need to shut down DRM and free DRI data in XDestroyWindow(), too.
+ */
+ dpy->driScreen = (*dpy->createScreen)(dpy->driver,
+ &dpy->driverContext);
+ if (!dpy->driScreen) {
+ fprintf(stderr, "%s: __driCreateScreen failed\n", __FUNCTION__);
+ dlclose(dpy->dlHandle);
+ free(dpy);
+ return NULL;
+ }
+
+ /* Anything more to do?
+ */
+ return dpy;
+}
+
+
+/**
+ * \brief Release display resources.
+ *
+ * When the application is about to exit, the resources associated with the
+ * graphics system can be released by calling this function.
+ *
+ * \param dpy display handle. It becomes invalid at this point.
+ *
+ * Destroys the window if any, and destroys the per-screen
+ * driver private information.
+ * Calls __miniglx_close_connections().
+ *
+ * If a server, puts the the framebuffer back into the initial state.
+ *
+ * Finally frees the display structure.
+ */
+void
+XCloseDisplay( Display *dpy )
+{
+ glXMakeCurrent( dpy, NULL, NULL);
+
+ if (dpy->NumWindows)
+ XDestroyWindow( dpy, dpy->TheWindow );
+
+ /* As this is done in XOpenDisplay, need to undo it here:
+ */
+ (*dpy->driScreen->destroyScreen)(dpy->driScreen);
+
+ __miniglx_close_connections( dpy );
+
+ if (!dpy->IsClient) {
+ /* put framebuffer back to initial state
+ */
+ (*dpy->driver->haltFBDev)( &dpy->driverContext );
+ RestoreFBDev(dpy);
+ CloseFBDev(dpy);
+ }
+
+ dlclose(dpy->dlHandle);
+ free(dpy);
+}
+
+
+/**
+ * \brief Window creation.
+ *
+ * \param display a display handle, as returned by XOpenDisplay().
+ * \param parent the parent window for the new window. For Mini GLX this should
+ * be
+ * \code RootWindow(display, 0) \endcode
+ * \param x the window abscissa. For Mini GLX, it should be zero.
+ * \param y the window ordinate. For Mini GLX, it should be zero.
+ * \param width the window width. For Mini GLX, this specifies the desired
+ * screen width such as 1024 or 1280.
+ * \param height the window height. For Mini GLX, this specifies the desired
+ * screen height such as 768 or 1024.
+ * \param border_width the border width. For Mini GLX, it should be zero.
+ * \param depth the window pixel depth. For Mini GLX, this should be the depth
+ * found in the #XVisualInfo object returned by glXChooseVisual()
+ * \param class the window class. For Mini GLX this value should be
+ * #InputOutput.
+ * \param visual the visual type. It should be the visual field of the
+ * #XVisualInfo object returned by glXChooseVisual().
+ * \param valuemask which fields of the XSetWindowAttributes() are to be used.
+ * For Mini GLX this is typically the bitmask
+ * \code CWBackPixel | CWBorderPixel | CWColormap \endcode
+ * \param attributes initial window attributes. The
+ * XSetWindowAttributes::background_pixel, XSetWindowAttributes::border_pixel
+ * and XSetWindowAttributes::colormap fields should be set.
+ *
+ * \return a window handle if it succeeds or zero if it fails.
+ *
+ * \note For Mini GLX, windows are full-screen; they cover the entire frame
+ * buffer. Also, Mini GLX imposes a limit of one window. A second window
+ * cannot be created until the first one is destroyed.
+ *
+ * This function creates and initializes a ::MiniGLXWindowRec structure after
+ * ensuring that there is no other window created. Performs the per-drawable
+ * client-side initialization calling the __DRIscreenRec::createDrawable
+ * method.
+ *
+ */
+Window
+XCreateWindow( Display *dpy, Window parent, int x, int y,
+ unsigned int width, unsigned int height,
+ unsigned int border_width, int depth, unsigned int class,
+ Visual *visual, unsigned long valuemask,
+ XSetWindowAttributes *attributes )
+{
+ Window win;
+
+ /* ignored */
+ (void) x;
+ (void) y;
+ (void) border_width;
+ (void) depth;
+ (void) class;
+ (void) valuemask;
+ (void) attributes;
+
+ if (!dpy->IsClient) {
+ fprintf(stderr, "Server process may not create windows (currently)\n");
+ return NULL;
+ }
+
+ if (dpy->NumWindows > 0)
+ return NULL; /* only allow one window */
+
+ assert(dpy->TheWindow == NULL);
+
+ win = malloc(sizeof(struct MiniGLXWindowRec));
+ if (!win)
+ return NULL;
+
+ /* In rotated mode, translate incoming x,y,width,height into
+ * 'normal' coordinates.
+ */
+ if (dpy->rotateMode) {
+ int tmp;
+ tmp = width; width = height; height = tmp;
+ tmp = x; x = y; y = tmp;
+ }
+
+ /* init other per-window fields */
+ win->x = 0;
+ win->y = 0;
+ win->w = width;
+ win->h = height;
+ win->visual = visual; /* ptr assignment */
+
+ win->bytesPerPixel = dpy->driverContext.cpp;
+ win->rowStride = dpy->driverContext.shared.virtualWidth * win->bytesPerPixel;
+ win->size = win->rowStride * height;
+ win->frontStart = dpy->driverContext.FBAddress;
+ win->frontBottom = (GLubyte *) win->frontStart + (height-1) * win->rowStride;
+
+ /* This is incorrect: the hardware driver could put the backbuffer
+ * just about anywhere. These fields, including the above are
+ * hardware dependent & don't really belong here.
+ */
+ if (visual->mode->doubleBufferMode) {
+ win->backStart = (GLubyte *) win->frontStart +
+ win->rowStride * dpy->driverContext.shared.virtualHeight;
+ win->backBottom = (GLubyte *) win->backStart
+ + (height - 1) * win->rowStride;
+ win->curBottom = win->backBottom;
+ }
+ else {
+ /* single buffered */
+ win->backStart = NULL;
+ win->backBottom = NULL;
+ win->curBottom = win->frontBottom;
+ }
+
+ win->driDrawable = dpy->driScreen->createDrawable(dpy->driScreen,
+ width, height,
+ dpy->clientID, visual->mode);
+
+ if (!win->driDrawable) {
+ fprintf(stderr, "%s: dri.createDrawable failed\n", __FUNCTION__);
+ free(win);
+ return NULL;
+ }
+
+ dpy->NumWindows++;
+ dpy->TheWindow = win;
+
+ return win;
+}
+
+
+/**
+ * \brief Destroy window.
+ *
+ * \param display display handle.
+ * \param w window handle.
+ *
+ * This function calls XUnmapWindow() and frees window \p w.
+ *
+ * In case of destroying the current buffer first unbinds the GLX context
+ * by calling glXMakeCurrent() with no drawable.
+ */
+void
+XDestroyWindow( Display *display, Window win )
+{
+ if (display && display->IsClient && win) {
+ /* check if destroying the current buffer */
+ Window curDraw = glXGetCurrentDrawable();
+ if (win == curDraw) {
+ glXMakeCurrent( display, NULL, NULL);
+ }
+
+ XUnmapWindow( display, win );
+
+ /* Destroy the drawable. */
+ (*win->driDrawable->destroyDrawable)(win->driDrawable);
+ free(win);
+
+ /* unlink window from display */
+ display->NumWindows--;
+ assert(display->NumWindows == 0);
+ display->TheWindow = NULL;
+ }
+}
+
+
+
+
+/**
+ * \brief Create color map structure.
+ *
+ * \param dpy the display handle as returned by XOpenDisplay().
+ * \param w the window on whose screen you want to create a color map. This
+ * parameter is ignored by Mini GLX but should be the value returned by the
+ * \code RootWindow(display, 0) \endcode macro.
+ * \param visual a visual type supported on the screen. This parameter is
+ * ignored by Mini GLX but should be the XVisualInfo::visual returned by
+ * glXChooseVisual().
+ * \param alloc the color map entries to be allocated. This parameter is ignored
+ * by Mini GLX but should be set to #AllocNone.
+ *
+ * \return the color map.
+ *
+ * This function is only provided to ease porting. Practically a no-op -
+ * returns a pointer to a dynamically allocated chunk of memory (one byte).
+ */
+Colormap
+XCreateColormap( Display *dpy, Window w, Visual *visual, int alloc )
+{
+ (void) dpy;
+ (void) w;
+ (void) visual;
+ (void) alloc;
+ return (Colormap) malloc(1);
+}
+
+
+/**
+ * \brief Destroy color map structure.
+ *
+ * \param display The display handle as returned by XOpenDisplay().
+ * \param colormap the color map to destroy.
+ *
+ * This function is only provided to ease porting. Practically a no-op.
+ *
+ * Frees the memory pointed by \p colormap.
+ */
+void
+XFreeColormap( Display *display, Colormap colormap )
+{
+ (void) display;
+ (void) colormap;
+ free(colormap);
+}
+
+
+/**
+ * \brief Free client data.
+ *
+ * \param data the data that is to be freed.
+ *
+ * Frees the memory pointed by \p data.
+ */
+void
+XFree( void *data )
+{
+ free(data);
+}
+
+
+/**
+ * \brief Query available visuals.
+ *
+ * \param dpy the display handle, as returned by XOpenDisplay().
+ * \param vinfo_mask a bitmask indicating which fields of the \p vinfo_template
+ * are to be matched. The value must be \c VisualScreenMask.
+ * \param vinfo_template a template whose fields indicate which visual
+ * attributes must be matched by the results. The XVisualInfo::screen field of
+ * this structure must be zero.
+ * \param nitens_return will hold the number of visuals returned.
+ *
+ * \return the address of an array of all available visuals.
+ *
+ * An example of using XGetVisualInfo() to get all available visuals follows:
+ *
+ * \code
+ * XVisualInfo vinfo_template, *results;
+ * int nitens_return;
+ * Display *dpy = XOpenDisplay(NULL);
+ * vinfo_template.screen = 0;
+ * results = XGetVisualInfo(dpy, VisualScreenMask, &vinfo_template, &nitens_return);
+ * \endcode
+ *
+ * Returns the list of all ::XVisualInfo available, one per
+ * ::__GLcontextMode stored in MiniGLXDisplayRec::modes.
+ */
+XVisualInfo *
+XGetVisualInfo( Display *dpy, long vinfo_mask, XVisualInfo *vinfo_template, int *nitens_return )
+{
+ XVisualInfo *results;
+ Visual *visResults;
+ int i, n;
+
+ ASSERT(vinfo_mask == VisualScreenMask);
+ ASSERT(vinfo_template.screen == 0);
+
+ n = dpy->numModes;
+ results = (XVisualInfo *)calloc(1, n * sizeof(XVisualInfo));
+ if (!results) {
+ *nitens_return = 0;
+ return NULL;
+ }
+
+ visResults = (Visual *)calloc(1, n * sizeof(Visual));
+ if (!results) {
+ free(results);
+ *nitens_return = 0;
+ return NULL;
+ }
+
+ for (i = 0; i < n; i++) {
+ visResults[i].mode = dpy->modes + i;
+ visResults[i].visInfo = results + i;
+ visResults[i].dpy = dpy;
+
+ if (dpy->driverContext.bpp == 32)
+ visResults[i].pixelFormat = PF_B8G8R8A8; /* XXX: FIX ME */
+ else
+ visResults[i].pixelFormat = PF_B5G6R5; /* XXX: FIX ME */
+
+ results[i].visual = visResults + i;
+ results[i].visualid = i;
+ results[i].class = TrueColor;
+ results[i].depth = dpy->modes[i].redBits +
+ dpy->modes[i].redBits +
+ dpy->modes[i].redBits +
+ dpy->modes[i].redBits;
+ results[i].bits_per_rgb = dpy->driverContext.bpp;
+ }
+ *nitens_return = n;
+ return results;
+}
+
+
+/**
+ * \brief Return a visual that matches specified attributes.
+ *
+ * \param dpy the display handle, as returned by XOpenDisplay().
+ * \param screen the screen number. It is currently ignored by Mini GLX and
+ * should be zero.
+ * \param attribList a list of GLX attributes which describe the desired pixel
+ * format. It is terminated by the token \c None.
+ *
+ * The attributes are as follows:
+ * \arg GLX_USE_GL:
+ * This attribute should always be present in order to maintain compatibility
+ * with GLX.
+ * \arg GLX_RGBA:
+ * If present, only RGBA pixel formats will be considered. Otherwise, only
+ * color index formats are considered.
+ * \arg GLX_DOUBLEBUFFER:
+ * if present, only double-buffered pixel formats will be chosen.
+ * \arg GLX_RED_SIZE \e n:
+ * Must be followed by a non-negative integer indicating the minimum number of
+ * bits per red pixel component that is acceptable.
+ * \arg GLX_GREEN_SIZE \e n:
+ * Must be followed by a non-negative integer indicating the minimum number of
+ * bits per green pixel component that is acceptable.
+ * \arg GLX_BLUE_SIZE \e n:
+ * Must be followed by a non-negative integer indicating the minimum number of
+ * bits per blue pixel component that is acceptable.
+ * \arg GLX_ALPHA_SIZE \e n:
+ * Must be followed by a non-negative integer indicating the minimum number of
+ * bits per alpha pixel component that is acceptable.
+ * \arg GLX_STENCIL_SIZE \e n:
+ * Must be followed by a non-negative integer indicating the minimum number of
+ * bits per stencil value that is acceptable.
+ * \arg GLX_DEPTH_SIZE \e n:
+ * Must be followed by a non-negative integer indicating the minimum number of
+ * bits per depth component that is acceptable.
+ * \arg None:
+ * This token is used to terminate the attribute list.
+ *
+ * \return a pointer to an #XVisualInfo object which most closely matches the
+ * requirements of the attribute list. If there is no visual which matches the
+ * request, \c NULL will be returned.
+ *
+ * \note Visuals with accumulation buffers are not available.
+ *
+ * This function searches the list of available visual configurations in
+ * MiniGLXDisplayRec::configs for a configuration which best matches the GLX
+ * attribute list parameter. A new ::XVisualInfo object is created which
+ * describes the visual configuration. The match criteria is described in the
+ * specification.
+ */
+XVisualInfo*
+glXChooseVisual( Display *dpy, int screen, int *attribList )
+{
+ Visual *vis;
+ XVisualInfo *visInfo;
+ const int *attrib;
+ GLboolean rgbFlag = GL_FALSE, dbFlag = GL_FALSE, stereoFlag = GL_FALSE;
+ GLint redBits = 0, greenBits = 0, blueBits = 0, alphaBits = 0;
+ GLint indexBits = 0, depthBits = 0, stencilBits = 0;
+ GLint numSamples = 0;
+ int i;
+
+ /*
+ * XXX in the future, <screen> might be interpreted as a VT
+ */
+ ASSERT(dpy);
+ ASSERT(screen == 0);
+
+ vis = (Visual *)calloc(1, sizeof(Visual));
+ if (!vis)
+ return NULL;
+
+ visInfo = (XVisualInfo *)malloc(sizeof(XVisualInfo));
+ if (!visInfo) {
+ free(vis);
+ return NULL;
+ }
+
+ visInfo->visual = vis;
+ vis->visInfo = visInfo;
+ vis->dpy = dpy;
+
+ /* parse the attribute list */
+ for (attrib = attribList; attrib && *attrib != None; attrib++) {
+ switch (attrib[0]) {
+ case GLX_DOUBLEBUFFER:
+ dbFlag = GL_TRUE;
+ break;
+ case GLX_RGBA:
+ rgbFlag = GL_TRUE;
+ break;
+ case GLX_RED_SIZE:
+ redBits = attrib[1];
+ attrib++;
+ break;
+ case GLX_GREEN_SIZE:
+ redBits = attrib[1];
+ attrib++;
+ break;
+ case GLX_BLUE_SIZE:
+ redBits = attrib[1];
+ attrib++;
+ break;
+ case GLX_ALPHA_SIZE:
+ redBits = attrib[1];
+ attrib++;
+ break;
+ case GLX_STENCIL_SIZE:
+ stencilBits = attrib[1];
+ attrib++;
+ break;
+ case GLX_DEPTH_SIZE:
+ depthBits = attrib[1];
+ attrib++;
+ break;
+#if 0
+ case GLX_ACCUM_RED_SIZE:
+ accumRedBits = attrib[1];
+ attrib++;
+ break;
+ case GLX_ACCUM_GREEN_SIZE:
+ accumGreenBits = attrib[1];
+ attrib++;
+ break;
+ case GLX_ACCUM_BLUE_SIZE:
+ accumBlueBits = attrib[1];
+ attrib++;
+ break;
+ case GLX_ACCUM_ALPHA_SIZE:
+ accumAlphaBits = attrib[1];
+ attrib++;
+ break;
+ case GLX_LEVEL:
+ /* ignored for now */
+ break;
+#endif
+ default:
+ /* unexpected token */
+ fprintf(stderr, "unexpected token in glXChooseVisual attrib list\n");
+ free(vis);
+ free(visInfo);
+ return NULL;
+ }
+ }
+
+ /* search screen configs for suitable visual */
+ (void) numSamples;
+ (void) indexBits;
+ (void) redBits;
+ (void) greenBits;
+ (void) blueBits;
+ (void) alphaBits;
+ (void) stereoFlag;
+ for (i = 0; i < dpy->numModes; i++) {
+ const __GLcontextModes *mode = dpy->modes + i;
+ if (mode->rgbMode == rgbFlag &&
+ mode->redBits >= redBits &&
+ mode->greenBits >= greenBits &&
+ mode->blueBits >= blueBits &&
+ mode->alphaBits >= alphaBits &&
+ mode->depthBits >= depthBits &&
+ mode->stencilBits >= stencilBits) {
+ /* found it */
+ visInfo->visualid = i;
+ vis->mode = mode;
+ break;
+ }
+ }
+ if (!vis->mode)
+ return NULL;
+
+ /* compute depth and bpp */
+ if (rgbFlag) {
+ /* XXX maybe support depth 16 someday */
+ visInfo->class = TrueColor;
+ visInfo->depth = dpy->driverContext.bpp;
+ visInfo->bits_per_rgb = dpy->driverContext.bpp;
+ if (dpy->driverContext.bpp == 32)
+ vis->pixelFormat = PF_B8G8R8A8;
+ else
+ vis->pixelFormat = PF_B5G6R5;
+ }
+ else {
+ /* color index mode */
+ visInfo->class = PseudoColor;
+ visInfo->depth = 8;
+ visInfo->bits_per_rgb = 8; /* bits/pixel */
+ vis->pixelFormat = PF_CI8;
+ }
+
+ return visInfo;
+}
+
+
+/**
+ * \brief Return information about GLX visuals.
+ *
+ * \param dpy the display handle, as returned by XOpenDisplay().
+ * \param vis the visual to be queried, as returned by glXChooseVisual().
+ * \param attrib the visual attribute to be returned.
+ * \param value pointer to an integer in which the result of the query will be
+ * stored.
+ *
+ * \return zero if no error occurs, \c GLX_INVALID_ATTRIBUTE if the attribute
+ * parameter is invalid, or \c GLX_BAD_VISUAL if the \p vis parameter is
+ * invalid.
+ *
+ * Returns the appropriate attribute of ::__GLXvisualConfig pointed by
+ * MiniGLXVisualRec::glxConfig of XVisualInfo::visual.
+ *
+ * \sa data types.
+ */
+int
+glXGetConfig( Display *dpy, XVisualInfo *vis, int attrib, int *value )
+{
+ const __GLcontextModes *mode = vis->visual->mode;
+ if (!mode) {
+ *value = 0;
+ return GLX_BAD_VISUAL;
+ }
+
+ switch (attrib) {
+ case GLX_USE_GL:
+ *value = True;
+ return 0;
+ case GLX_RGBA:
+ *value = mode->rgbMode;
+ return 0;
+ case GLX_DOUBLEBUFFER:
+ *value = mode->doubleBufferMode;
+ return 0;
+ case GLX_RED_SIZE:
+ *value = mode->redBits;
+ return 0;
+ case GLX_GREEN_SIZE:
+ *value = mode->greenBits;
+ return 0;
+ case GLX_BLUE_SIZE:
+ *value = mode->blueBits;
+ return 0;
+ case GLX_ALPHA_SIZE:
+ *value = mode->alphaBits;
+ return 0;
+ case GLX_DEPTH_SIZE:
+ *value = mode->depthBits;
+ return 0;
+ case GLX_STENCIL_SIZE:
+ *value = mode->stencilBits;
+ return 0;
+ default:
+ *value = 0;
+ return GLX_BAD_ATTRIBUTE;
+ }
+ return 0;
+}
+
+
+/**
+ * \brief Create a new GLX rendering context.
+ *
+ * \param dpy the display handle, as returned by XOpenDisplay().
+ * \param vis the visual that defines the frame buffer resources available to
+ * the rendering context, as returned by glXChooseVisual().
+ * \param shareList If non-zero, texture objects and display lists are shared
+ * with the named rendering context. If zero, texture objects and display lists
+ * will (initially) be private to this context. They may be shared when a
+ * subsequent context is created.
+ * \param direct whether direct or indirect rendering is desired. For Mini GLX
+ * this value is ignored but it should be set to \c True.
+ *
+ * \return a ::GLXContext handle if it succeeds or zero if it fails due to
+ * invalid parameter or insufficient resources.
+ *
+ * This function creates and initializes a ::MiniGLXContextRec structure and
+ * calls the __DRIscreenRec::createContext method to initialize the client
+ * private data.
+ */
+GLXContext
+glXCreateContext( Display *dpy, XVisualInfo *vis,
+ GLXContext shareList, Bool direct )
+{
+ GLXContext ctx;
+ void *sharePriv;
+
+ ASSERT(vis);
+
+ ctx = (struct MiniGLXContextRec *)calloc(1, sizeof(struct MiniGLXContextRec));
+ if (!ctx)
+ return NULL;
+
+ ctx->vid = vis->visualid;
+
+ if (shareList)
+ sharePriv = shareList->driContext;
+ else
+ sharePriv = NULL;
+
+ ctx->driContext = (*dpy->driScreen->createContext)(dpy->driScreen,
+ vis->visual->mode,
+ sharePriv);
+ if (!ctx->driContext) {
+ free(ctx);
+ return NULL;
+ }
+
+ return ctx;
+}
+
+
+/**
+ * \brief Destroy a GLX context.
+ *
+ * \param dpy the display handle, as returned by XOpenDisplay().
+ * \param ctx the GLX context to be destroyed.
+ *
+ * This function frees the \p ctx parameter after unbinding the current context
+ * by calling the __DRIcontextRec::bindContext method with zeros and calling
+ * the __DRIcontextRec::destroyContext method.
+ */
+void
+glXDestroyContext( Display *dpy, GLXContext ctx )
+{
+ GLXContext glxctx = glXGetCurrentContext();
+
+ if (ctx) {
+ if (glxctx == ctx) {
+ /* destroying current context */
+ (*ctx->driContext->bindContext)(dpy->driScreen, 0, 0);
+ CurrentContext = 0;
+ }
+ (*ctx->driContext->destroyContext)(ctx->driContext);
+ free(ctx);
+ }
+}
+
+
+/**
+ * \brief Bind a GLX context to a window or a pixmap.
+ *
+ * \param dpy the display handle, as returned by XOpenDisplay().
+ * \param drawable the window or drawable to bind to the rendering context.
+ * This should be the value returned by XCreateWindow().
+ * \param ctx the GLX context to be destroyed.
+ *
+ * \return \c True if it succeeds, \c False otherwise to indicate an invalid
+ * display, window or context parameter.
+ *
+ * The current rendering context may be unbound by calling glXMakeCurrent()
+ * with the window and context parameters set to zero.
+ *
+ * An application may create any number of rendering contexts and bind them as
+ * needed. Note that binding a rendering context is generally not a
+ * light-weight operation. Most simple OpenGL applications create only one
+ * rendering context.
+ *
+ * This function first unbinds any old context via
+ * __DRIcontextRec::unbindContext and binds the new one via
+ * __DRIcontextRec::bindContext.
+ *
+ * If \p drawable is zero it unbinds the GLX context by calling
+ * __DRIcontextRec::bindContext with zeros.
+ */
+Bool
+glXMakeCurrent( Display *dpy, GLXDrawable drawable, GLXContext ctx)
+{
+ if (dpy && drawable && ctx) {
+ GLXContext oldContext = glXGetCurrentContext();
+ GLXDrawable oldDrawable = glXGetCurrentDrawable();
+ /* unbind old */
+ if (oldContext) {
+ (*oldContext->driContext->unbindContext)(oldDrawable->driDrawable, oldContext->driContext);
+ }
+ /* bind new */
+ CurrentContext = ctx;
+ (*ctx->driContext->bindContext)(dpy->driScreen, drawable->driDrawable, ctx->driContext);
+ ctx->drawBuffer = drawable;
+ ctx->curBuffer = drawable;
+ }
+ else if (ctx && dpy) {
+ /* unbind */
+ (*ctx->driContext->bindContext)(dpy->driScreen, 0, 0);
+ }
+ else if (dpy) {
+ CurrentContext = 0; /* kw: this seems to be intended??? */
+ }
+
+ return True;
+}
+
+
+/**
+ * \brief Exchange front and back buffers.
+ *
+ * \param dpy the display handle, as returned by XOpenDisplay().
+ * \param drawable the drawable whose buffers are to be swapped.
+ *
+ * Any pending rendering commands will be completed before the buffer swap
+ * takes place.
+ *
+ * Calling glXSwapBuffers() on a window which is single-buffered has no effect.
+ *
+ * This function just calls the __DRIdrawableRec::swapBuffers method to do the
+ * work.
+ */
+void
+glXSwapBuffers( Display *dpy, GLXDrawable drawable )
+{
+ if (!dpy || !drawable)
+ return;
+
+ (*drawable->driDrawable->swapBuffers)(drawable->driDrawable);
+}
+
+
+/**
+ * \brief Return the current context
+ *
+ * \return the current context, as specified by glXMakeCurrent(), or zero if no
+ * context is currently bound.
+ *
+ * \sa glXCreateContext(), glXMakeCurrent()
+ *
+ * Returns the value of the ::CurrentContext global variable.
+ */
+GLXContext
+glXGetCurrentContext( void )
+{
+ return CurrentContext;
+}
+
+
+/**
+ * \brief Return the current drawable.
+ *
+ * \return the current drawable, as specified by glXMakeCurrent(), or zero if
+ * no drawable is currently bound.
+ *
+ * This function gets the current context via glXGetCurrentContext() and
+ * returns the MiniGLXContextRec::drawBuffer attribute.
+ */
+GLXDrawable
+glXGetCurrentDrawable( void )
+{
+ GLXContext glxctx = glXGetCurrentContext();
+ if (glxctx)
+ return glxctx->drawBuffer;
+ else
+ return NULL;
+}
+
+
+/**
+ * \brief Query function address.
+ *
+ * The glXGetProcAddress() function will return the address of any available
+ * OpenGL or Mini GLX function.
+ *
+ * \param procName name of the function to be returned.
+ *
+ * \return If \p procName is a valid function name, a pointer to that function
+ * will be returned. Otherwise, \c NULL will be returned.
+ *
+ * The purpose of glXGetProcAddress() is to facilitate using future extensions
+ * to OpenGL or Mini GLX. If a future version of the library adds new extension
+ * functions they'll be accessible via glXGetProcAddress(). The alternative is
+ * to hard-code calls to the new functions in the application but doing so will
+ * prevent linking the application with older versions of the library.
+ *
+ * Returns the function address by looking up its name in a static (name,
+ * address) pair list.
+ */
+const void *
+glXGetProcAddress( const GLubyte *procName )
+{
+ struct name_address {
+ const char *name;
+ const void *func;
+ };
+ static const struct name_address functions[] = {
+ { "glXChooseVisual", (void *) glXChooseVisual },
+ { "glXCreateContext", (void *) glXCreateContext },
+ { "glXDestroyContext", (void *) glXDestroyContext },
+ { "glXMakeCurrent", (void *) glXMakeCurrent },
+ { "glXSwapBuffers", (void *) glXSwapBuffers },
+ { "glXGetCurrentContext", (void *) glXGetCurrentContext },
+ { "glXGetCurrentDrawable", (void *) glXGetCurrentDrawable },
+ { "glXGetProcAddress", (void *) glXGetProcAddress },
+ { "XOpenDisplay", (void *) XOpenDisplay },
+ { "XCloseDisplay", (void *) XCloseDisplay },
+ { "XCreateWindow", (void *) XCreateWindow },
+ { "XDestroyWindow", (void *) XDestroyWindow },
+ { "XMapWindow", (void *) XMapWindow },
+ { "XCreateColormap", (void *) XCreateColormap },
+ { "XFreeColormap", (void *) XFreeColormap },
+ { "XFree", (void *) XFree },
+ { "XGetVisualinfo", (void *) XGetVisualInfo },
+ { NULL, NULL }
+ };
+ const struct name_address *entry;
+ for (entry = functions; entry->name; entry++) {
+ if (strcmp(entry->name, (const char *) procName) == 0) {
+ return entry->func;
+ }
+ }
+ return _glapi_get_proc_address((const char *) procName);
+}
+
+
+/**
+ * \brief Query the Mini GLX version.
+ *
+ * \param dpy the display handle. It is currently ignored, but should be the
+ * value returned by XOpenDisplay().
+ * \param major receives the major version number of Mini GLX.
+ * \param minor receives the minor version number of Mini GLX.
+ *
+ * \return \c True if the function succeeds, \c False if the function fails due
+ * to invalid parameters.
+ *
+ * \sa #MINI_GLX_VERSION_1_0.
+ *
+ * Returns the hard-coded Mini GLX version.
+ */
+Bool
+glXQueryVersion( Display *dpy, int *major, int *minor )
+{
+ (void) dpy;
+ *major = 1;
+ *minor = 0;
+ return True;
+}
+
+
+/*@}*/