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open_toontown_panda3d/panda/src/glxdisplay/glxGraphicsPipe.cxx

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// Filename: glxGraphicsPipe.cxx
// Created by: mike (09Jan97)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license. You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://etc.cmu.edu/panda3d/docs/license/ .
//
// To contact the maintainers of this program write to
// panda3d-general@lists.sourceforge.net .
//
////////////////////////////////////////////////////////////////////
#include "glxGraphicsPipe.h"
#include "glxGraphicsWindow.h"
#include "glxGraphicsBuffer.h"
#include "glxGraphicsStateGuardian.h"
#include "config_glxdisplay.h"
#include "frameBufferProperties.h"
#include "mutexHolder.h"
TypeHandle glxGraphicsPipe::_type_handle;
bool glxGraphicsPipe::_error_handlers_installed = false;
glxGraphicsPipe::ErrorHandlerFunc *glxGraphicsPipe::_prev_error_handler;
glxGraphicsPipe::IOErrorHandlerFunc *glxGraphicsPipe::_prev_io_error_handler;
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::Constructor
// Access: Public
// Description:
////////////////////////////////////////////////////////////////////
glxGraphicsPipe::
glxGraphicsPipe(const string &display) {
string display_spec = display;
if (display_spec.empty()) {
display_spec = display_cfg;
}
if (display_spec.empty()) {
display_spec = ExecutionEnvironment::get_environment_variable("DISPLAY");
}
if (display_spec.empty()) {
display_spec = ":0.0";
}
setlocale(LC_ALL, "");
_is_valid = false;
_supported_types = OT_window | OT_buffer | OT_texture_buffer;
_display = NULL;
_screen = 0;
_root = (Window)NULL;
_im = (XIM)NULL;
_hidden_cursor = None;
install_error_handlers();
_display = XOpenDisplay(display_spec.c_str());
if (!_display) {
glxdisplay_cat.error()
<< "Could not open display \"" << display_spec << "\".\n";
return;
}
if (!XSupportsLocale()) {
glxdisplay_cat.warning()
<< "X does not support locale " << setlocale(LC_ALL, NULL) << "\n";
}
XSetLocaleModifiers("");
int errorBase, eventBase;
if (!glXQueryExtension(_display, &errorBase, &eventBase)) {
glxdisplay_cat.error()
<< "OpenGL GLX extension not supported on display \"" << display_spec
<< "\".\n";
return;
}
_screen = DefaultScreen(_display);
_root = RootWindow(_display, _screen);
_display_width = DisplayWidth(_display, _screen);
_display_height = DisplayHeight(_display, _screen);
_is_valid = true;
// Connect to an input method for supporting international text
// entry.
_im = XOpenIM(_display, NULL, NULL, NULL);
if (_im == (XIM)NULL) {
glxdisplay_cat.warning()
<< "Couldn't open input method.\n";
}
// What styles does the current input method support?
/*
XIMStyles *im_supported_styles;
XGetIMValues(_im, XNQueryInputStyle, &im_supported_styles, NULL);
for (int i = 0; i < im_supported_styles->count_styles; i++) {
XIMStyle style = im_supported_styles->supported_styles[i];
cerr << "style " << i << ". " << hex << style << dec << "\n";
}
XFree(im_supported_styles);
*/
// Get the X atom number.
_wm_delete_window = XInternAtom(_display, "WM_DELETE_WINDOW", false);
}
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::Destructor
// Access: Public, Virtual
// Description:
////////////////////////////////////////////////////////////////////
glxGraphicsPipe::
~glxGraphicsPipe() {
release_hidden_cursor();
if (_im) {
XCloseIM(_im);
}
if (_display) {
XCloseDisplay(_display);
}
}
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::get_interface_name
// Access: Published, Virtual
// Description: Returns the name of the rendering interface
// associated with this GraphicsPipe. This is used to
// present to the user to allow him/her to choose
// between several possible GraphicsPipes available on a
// particular platform, so the name should be meaningful
// and unique for a given platform.
////////////////////////////////////////////////////////////////////
string glxGraphicsPipe::
get_interface_name() const {
return "OpenGL";
}
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::pipe_constructor
// Access: Public, Static
// Description: This function is passed to the GraphicsPipeSelection
// object to allow the user to make a default
// glxGraphicsPipe.
////////////////////////////////////////////////////////////////////
PT(GraphicsPipe) glxGraphicsPipe::
pipe_constructor() {
return new glxGraphicsPipe;
}
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::make_gsg
// Access: Protected, Virtual
// Description: Creates a new GSG to use the pipe (but no windows
// have been created yet for the GSG). This method will
// be called in the draw thread for the GSG.
////////////////////////////////////////////////////////////////////
PT(GraphicsStateGuardian) glxGraphicsPipe::
make_gsg(const FrameBufferProperties &properties,
GraphicsStateGuardian *share_with) {
if (!_is_valid) {
return NULL;
}
glxGraphicsStateGuardian *share_gsg = NULL;
GLXContext share_context = NULL;
if (share_with != (GraphicsStateGuardian *)NULL) {
if (!share_with->is_exact_type(glxGraphicsStateGuardian::get_class_type())) {
glxdisplay_cat.error()
<< "Cannot share context between glxGraphicsStateGuardian and "
<< share_with->get_type() << "\n";
return NULL;
}
DCAST_INTO_R(share_gsg, share_with, NULL);
share_context = share_gsg->_context;
}
FrameBufferProperties new_properties = properties;
GLXContext context = NULL;
XVisualInfo *visual = NULL;
#ifdef HAVE_GLXFBCONFIG
GLXFBConfig fbconfig = choose_fbconfig(new_properties);
if (fbconfig != None) {
context =
glXCreateNewContext(_display, fbconfig, GLX_RGBA_TYPE, share_context,
GL_TRUE);
if (context == NULL) {
fbconfig = None;
}
}
#endif // HAVE_GLXFBCONFIG
if (context == NULL) {
// If we couldn't create a context with the fbconfig interface,
// try falling back to the older XVisual interface.
visual = choose_visual(new_properties);
if (visual != (XVisualInfo *)NULL) {
context = glXCreateContext(_display, visual, None, GL_TRUE);
}
}
if (context == NULL) {
glxdisplay_cat.error()
<< "Could not create GL context.\n";
return NULL;
}
#ifdef HAVE_GLXFBCONFIG
if (visual == (XVisualInfo *)NULL) {
// If we used the fbconfig to open the context, we still need to
// get the associated XVisual.
nassertr(fbconfig != None, NULL);
visual = glXGetVisualFromFBConfig(_display, fbconfig);
}
// Now we can make a GSG.
PT(glxGraphicsStateGuardian) gsg =
new glxGraphicsStateGuardian(new_properties, share_gsg, context,
visual, _display, _screen, fbconfig);
#else
PT(glxGraphicsStateGuardian) gsg =
new glxGraphicsStateGuardian(new_properties, share_gsg, context,
visual, _display, _screen);
#endif // HAVE_GLXFBCONFIG
return gsg.p();
}
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::make_window
// Access: Protected, Virtual
// Description: Creates a new window on the pipe, if possible.
////////////////////////////////////////////////////////////////////
PT(GraphicsWindow) glxGraphicsPipe::
make_window(GraphicsStateGuardian *gsg, const string &name) {
if (!_is_valid) {
return NULL;
}
return new glxGraphicsWindow(this, gsg, name);
}
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::make_buffer
// Access: Protected, Virtual
// Description: Creates a new offscreen buffer on the pipe, if possible.
////////////////////////////////////////////////////////////////////
PT(GraphicsBuffer) glxGraphicsPipe::
make_buffer(GraphicsStateGuardian *gsg, const string &name,
int x_size, int y_size, bool want_texture) {
if (!_is_valid) {
return NULL;
}
#ifdef HAVE_GLXFBCONFIG
return new glxGraphicsBuffer(this, gsg, name, x_size, y_size, want_texture);
#else
return NULL;
#endif // HAVE_GLXFBCONFIG
}
#ifdef HAVE_GLXFBCONFIG
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::choose_fbconfig
// Access: Private
// Description: Selects an appropriate GLXFBConfig for the given
// frame buffer properties. Returns the selected
// fbconfig if successful, or None otherwise.
//
// If successful, this may modify properties to reflect
// the actual visual chosen.
////////////////////////////////////////////////////////////////////
GLXFBConfig glxGraphicsPipe::
choose_fbconfig(FrameBufferProperties &properties) const {
int frame_buffer_mode = 0;
int want_depth_bits = 0;
int want_color_bits = 0;
if (properties.has_frame_buffer_mode()) {
frame_buffer_mode = properties.get_frame_buffer_mode();
}
if (properties.has_depth_bits()) {
want_depth_bits = properties.get_depth_bits();
}
if (properties.has_color_bits()) {
want_color_bits = properties.get_color_bits();
}
/*
if (frame_buffer_mode & FrameBufferProperties::FM_multisample) {
if (!glx_supports("GLX_SGIS_multisample")) {
glxdisplay_cat.info()
<< "multisample not supported by this glx implementation.\n";
frame_buffer_mode &= ~FrameBufferProperties::FM_multisample;
}
}
*/
GLXFBConfig fbconfig =
try_for_fbconfig(frame_buffer_mode, want_depth_bits, want_color_bits);
// This is the severity level at which we'll report the details of
// the fbconfig we actually do find. Normally, it's debug-level
// information: we don't care about that much detail.
NotifySeverity show_fbconfig_severity = NS_debug;
if (fbconfig == None) {
glxdisplay_cat.info()
<< "glxGraphicsWindow::choose_fbconfig() - fbconfig with requested "
<< "capabilities not found; trying for lesser fbconfig.\n";
// If we're unable to get the fbconfig we asked for, however, we
// probably *do* care to know the details about what we actually
// got, even if we don't have debug mode set. So we'll report the
// fbconfig at a higher level.
show_fbconfig_severity = NS_info;
bool special_size_request =
(want_depth_bits != 1 || want_color_bits != 1);
// We try to be smart about choosing a close match for the fbconfig.
// First, we'll eliminate some of the more esoteric options one at
// a time, then two at a time, and finally we'll try just the bare
// minimum.
if (special_size_request) {
// Actually, first we'll eliminate all of the minimum sizes, to
// try to open a window with all of the requested options, but
// maybe not as many bits in some options as we'd like.
fbconfig = try_for_fbconfig(frame_buffer_mode, 1, 1);
}
if (fbconfig == None) {
// Ok, not good enough. Now try to eliminate options, but keep
// as many bits as we asked for.
// This array keeps the bitmasks of options that we pull out of
// the requested frame_buffer_mode, in order.
static const int strip_properties[] = {
// One esoteric option removed.
FrameBufferProperties::FM_multisample,
FrameBufferProperties::FM_stencil,
FrameBufferProperties::FM_accum,
FrameBufferProperties::FM_alpha,
FrameBufferProperties::FM_stereo,
// Two esoteric options removed.
FrameBufferProperties::FM_stencil | FrameBufferProperties::FM_multisample,
FrameBufferProperties::FM_accum | FrameBufferProperties::FM_multisample,
FrameBufferProperties::FM_alpha | FrameBufferProperties::FM_multisample,
FrameBufferProperties::FM_stereo | FrameBufferProperties::FM_multisample,
FrameBufferProperties::FM_stencil | FrameBufferProperties::FM_accum,
FrameBufferProperties::FM_alpha | FrameBufferProperties::FM_stereo,
FrameBufferProperties::FM_stencil | FrameBufferProperties::FM_accum | FrameBufferProperties::FM_multisample,
FrameBufferProperties::FM_alpha | FrameBufferProperties::FM_stereo | FrameBufferProperties::FM_multisample,
// All esoteric options removed.
FrameBufferProperties::FM_stencil | FrameBufferProperties::FM_accum | FrameBufferProperties::FM_alpha | FrameBufferProperties::FM_stereo | FrameBufferProperties::FM_multisample,
// All esoteric options, plus some we'd really really prefer,
// removed.
FrameBufferProperties::FM_stencil | FrameBufferProperties::FM_accum | FrameBufferProperties::FM_alpha | FrameBufferProperties::FM_stereo | FrameBufferProperties::FM_multisample | FrameBufferProperties::FM_double_buffer,
// A zero marks the end of the array.
0
};
pset<int> tried_masks;
tried_masks.insert(frame_buffer_mode);
int i;
for (i = 0; fbconfig == None && strip_properties[i] != 0; i++) {
int new_frame_buffer_mode = frame_buffer_mode & ~strip_properties[i];
if (tried_masks.insert(new_frame_buffer_mode).second) {
fbconfig = try_for_fbconfig(new_frame_buffer_mode, want_depth_bits,
want_color_bits);
}
}
if (special_size_request) {
tried_masks.clear();
tried_masks.insert(frame_buffer_mode);
if (fbconfig == None) {
// Try once more, this time eliminating all of the size
// requests.
for (i = 0; fbconfig == None && strip_properties[i] != 0; i++) {
int new_frame_buffer_mode = frame_buffer_mode & ~strip_properties[i];
if (tried_masks.insert(new_frame_buffer_mode).second) {
fbconfig = try_for_fbconfig(new_frame_buffer_mode, 1, 1);
}
}
}
}
if (fbconfig == None) {
// Here's our last-ditch desparation attempt: give us any GLX
// fbconfig at all!
fbconfig = try_for_fbconfig(0, 1, 1);
}
if (fbconfig == None) {
// This is only an info message, because we can still fall
// back to the XVisual interface.
glxdisplay_cat.info()
<< "Could not get any GLX fbconfig.\n";
return None;
}
}
}
glxdisplay_cat.info()
<< "Selected suitable GLX fbconfig.\n";
// Now update our framebuffer_mode and bit depth appropriately.
int render_mode, double_buffer, stereo, red_size, green_size, blue_size,
alpha_size, ared_size, agreen_size, ablue_size, aalpha_size,
depth_size, stencil_size, samples;
glXGetFBConfigAttrib(_display, fbconfig, GLX_RGBA, &render_mode);
glXGetFBConfigAttrib(_display, fbconfig, GLX_DOUBLEBUFFER, &double_buffer);
glXGetFBConfigAttrib(_display, fbconfig, GLX_STEREO, &stereo);
glXGetFBConfigAttrib(_display, fbconfig, GLX_RED_SIZE, &red_size);
glXGetFBConfigAttrib(_display, fbconfig, GLX_GREEN_SIZE, &green_size);
glXGetFBConfigAttrib(_display, fbconfig, GLX_BLUE_SIZE, &blue_size);
glXGetFBConfigAttrib(_display, fbconfig, GLX_ALPHA_SIZE, &alpha_size);
glXGetFBConfigAttrib(_display, fbconfig, GLX_ACCUM_RED_SIZE, &ared_size);
glXGetFBConfigAttrib(_display, fbconfig, GLX_ACCUM_GREEN_SIZE, &agreen_size);
glXGetFBConfigAttrib(_display, fbconfig, GLX_ACCUM_BLUE_SIZE, &ablue_size);
glXGetFBConfigAttrib(_display, fbconfig, GLX_ACCUM_ALPHA_SIZE, &aalpha_size);
glXGetFBConfigAttrib(_display, fbconfig, GLX_DEPTH_SIZE, &depth_size);
glXGetFBConfigAttrib(_display, fbconfig, GLX_STENCIL_SIZE, &stencil_size);
glXGetFBConfigAttrib(_display, fbconfig, GLX_SAMPLES, &samples);
frame_buffer_mode = 0;
if (double_buffer) {
frame_buffer_mode |= FrameBufferProperties::FM_double_buffer;
}
if (stereo) {
frame_buffer_mode |= FrameBufferProperties::FM_stereo;
}
if (!render_mode) {
frame_buffer_mode |= FrameBufferProperties::FM_index;
}
if (stencil_size != 0) {
frame_buffer_mode |= FrameBufferProperties::FM_stencil;
}
if (depth_size != 0) {
frame_buffer_mode |= FrameBufferProperties::FM_depth;
}
if (alpha_size != 0) {
frame_buffer_mode |= FrameBufferProperties::FM_alpha;
}
if (ared_size + agreen_size + ablue_size != 0) {
frame_buffer_mode |= FrameBufferProperties::FM_accum;
}
if (samples != 0) {
frame_buffer_mode |= FrameBufferProperties::FM_multisample;
}
properties.set_frame_buffer_mode(frame_buffer_mode);
properties.set_color_bits(red_size + green_size + blue_size + alpha_size);
properties.set_depth_bits(depth_size);
if (glxdisplay_cat.is_on(show_fbconfig_severity)) {
glxdisplay_cat.out(show_fbconfig_severity)
<< "GLX Fbconfig Info (# bits of each):" << endl
<< " RGBA: " << red_size << " " << green_size << " " << blue_size
<< " " << alpha_size << endl
<< " Accum RGBA: " << ared_size << " " << agreen_size << " "
<< ablue_size << " " << aalpha_size << endl
<< " Depth: " << depth_size << endl
<< " Stencil: " << stencil_size << endl
<< " Samples: " << samples << endl
<< " DoubleBuffer? " << double_buffer << endl
<< " Stereo? " << stereo << endl;
}
return fbconfig;
}
#endif // HAVE_GLXFBCONFIG
#ifdef HAVE_GLXFBCONFIG
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::try_for_fbconfig
// Access: Private
// Description: Attempt to get the requested fbconfig, if it is
// available. It's just a wrapper around
// glXChooseFBConfig(). It returns the fbconfig
// information if possible, or None if it is not.
////////////////////////////////////////////////////////////////////
GLXFBConfig glxGraphicsPipe::
try_for_fbconfig(int framebuffer_mode,
int want_depth_bits, int want_color_bits) const {
static const int max_attrib_list = 32;
int attrib_list[max_attrib_list];
int n=0;
glxdisplay_cat.debug()
<< "Trying for fbconfig with: RGB(" << want_color_bits << ")";
int want_color_component_bits;
if (framebuffer_mode & FrameBufferProperties::FM_alpha) {
want_color_component_bits = max(want_color_bits / 4, 1);
} else {
want_color_component_bits = max(want_color_bits / 3, 1);
}
attrib_list[n++] = GLX_RED_SIZE;
attrib_list[n++] = want_color_component_bits;
attrib_list[n++] = GLX_GREEN_SIZE;
attrib_list[n++] = want_color_component_bits;
attrib_list[n++] = GLX_BLUE_SIZE;
attrib_list[n++] = want_color_component_bits;
if (framebuffer_mode & FrameBufferProperties::FM_alpha) {
glxdisplay_cat.debug(false) << " ALPHA";
attrib_list[n++] = GLX_ALPHA_SIZE;
attrib_list[n++] = want_color_component_bits;
}
switch (framebuffer_mode & FrameBufferProperties::FM_buffer) {
case FrameBufferProperties::FM_single_buffer:
glxdisplay_cat.debug(false) << " SINGLEBUFFER";
attrib_list[n++] = GLX_DOUBLEBUFFER;
attrib_list[n++] = false;
break;
case FrameBufferProperties::FM_double_buffer:
case FrameBufferProperties::FM_triple_buffer:
glxdisplay_cat.debug(false) << " DOUBLEBUFFER";
attrib_list[n++] = GLX_DOUBLEBUFFER;
attrib_list[n++] = true;
break;
}
if (framebuffer_mode & FrameBufferProperties::FM_stereo) {
glxdisplay_cat.debug(false) << " STEREO";
attrib_list[n++] = GLX_STEREO;
attrib_list[n++] = true;
} else {
attrib_list[n++] = GLX_STEREO;
attrib_list[n++] = false;
}
if (framebuffer_mode & FrameBufferProperties::FM_depth) {
glxdisplay_cat.debug(false) << " DEPTH(" << want_depth_bits << ")";
attrib_list[n++] = GLX_DEPTH_SIZE;
attrib_list[n++] = want_depth_bits;
}
if (framebuffer_mode & FrameBufferProperties::FM_stencil) {
glxdisplay_cat.debug(false) << " STENCIL";
attrib_list[n++] = GLX_STENCIL_SIZE;
attrib_list[n++] = 1;
}
if (framebuffer_mode & FrameBufferProperties::FM_accum) {
glxdisplay_cat.debug(false) << " ACCUM";
attrib_list[n++] = GLX_ACCUM_RED_SIZE;
attrib_list[n++] = want_color_component_bits;
attrib_list[n++] = GLX_ACCUM_GREEN_SIZE;
attrib_list[n++] = want_color_component_bits;
attrib_list[n++] = GLX_ACCUM_BLUE_SIZE;
attrib_list[n++] = want_color_component_bits;
if (framebuffer_mode & FrameBufferProperties::FM_alpha) {
attrib_list[n++] = GLX_ACCUM_ALPHA_SIZE;
attrib_list[n++] = want_color_component_bits;
}
}
if (framebuffer_mode & FrameBufferProperties::FM_multisample) {
glxdisplay_cat.debug(false) << " MULTISAMPLE";
attrib_list[n++] = GLX_SAMPLES;
// We decide 4 is minimum number of samples
attrib_list[n++] = 4;
}
// Terminate the list
nassertr(n < max_attrib_list, None);
attrib_list[n] = (int)None;
int num_configs = 0;
GLXFBConfig *configs =
glXChooseFBConfig(_display, _screen, attrib_list, &num_configs);
if (glxdisplay_cat.is_debug()) {
if (configs != NULL) {
glxdisplay_cat.debug(false)
<< ", " << num_configs << " matches found!\n";
} else {
glxdisplay_cat.debug(false) << ", no match.\n";
}
}
if (configs == NULL || num_configs == 0) {
return None;
}
// Pick the first matching fbconfig; this will be the "best" one
// according to the GLX specifics.
GLXFBConfig fbconfig = configs[0];
XFree(configs);
return fbconfig;
}
#endif // HAVE_GLXFBCONFIG
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::choose visual
// Access: Private
// Description: Selects an appropriate X visual for the given frame
// buffer properties. Returns the visual pointer if
// successful, or NULL otherwise.
//
// If successful, this may modify properties to reflect
// the actual visual chosen.
//
// This is an older GLX interface, replaced by the new
// fbconfig interface. However, some implementations of
// GLX may not support fbconfig, so we have to have this
// code as a fallback.
////////////////////////////////////////////////////////////////////
XVisualInfo *glxGraphicsPipe::
choose_visual(FrameBufferProperties &properties) const {
int frame_buffer_mode = 0;
int want_depth_bits = 0;
int want_color_bits = 0;
if (properties.has_frame_buffer_mode()) {
frame_buffer_mode = properties.get_frame_buffer_mode();
}
if (properties.has_depth_bits()) {
want_depth_bits = properties.get_depth_bits();
}
if (properties.has_color_bits()) {
want_color_bits = properties.get_color_bits();
}
XVisualInfo *visual =
try_for_visual(frame_buffer_mode, want_depth_bits, want_color_bits);
// This is the severity level at which we'll report the details of
// the visual we actually do find. Normally, it's debug-level
// information: we don't care about that much detail.
NotifySeverity show_visual_severity = NS_debug;
if (visual == NULL) {
glxdisplay_cat.info()
<< "glxGraphicsWindow::choose_visual() - visual with requested\n"
<< " capabilities not found; trying for lesser visual.\n";
// If we're unable to get the visual we asked for, however, we
// probably *do* care to know the details about what we actually
// got, even if we don't have debug mode set. So we'll report the
// visual at a higher level.
show_visual_severity = NS_info;
bool special_size_request =
(want_depth_bits != 1 || want_color_bits != 1);
// We try to be smart about choosing a close match for the visual.
// First, we'll eliminate some of the more esoteric options one at
// a time, then two at a time, and finally we'll try just the bare
// minimum.
if (special_size_request) {
// Actually, first we'll eliminate all of the minimum sizes, to
// try to open a window with all of the requested options, but
// maybe not as many bits in some options as we'd like.
visual = try_for_visual(frame_buffer_mode, 1, 1);
}
if (visual == NULL) {
// Ok, not good enough. Now try to eliminate options, but keep
// as many bits as we asked for.
// This array keeps the bitmasks of options that we pull out of
// the requested frame_buffer_mode, in order.
static const int strip_properties[] = {
// One esoteric option removed.
FrameBufferProperties::FM_multisample,
FrameBufferProperties::FM_stencil,
FrameBufferProperties::FM_accum,
FrameBufferProperties::FM_alpha,
FrameBufferProperties::FM_stereo,
// Two esoteric options removed.
FrameBufferProperties::FM_stencil | FrameBufferProperties::FM_multisample,
FrameBufferProperties::FM_accum | FrameBufferProperties::FM_multisample,
FrameBufferProperties::FM_alpha | FrameBufferProperties::FM_multisample,
FrameBufferProperties::FM_stereo | FrameBufferProperties::FM_multisample,
FrameBufferProperties::FM_stencil | FrameBufferProperties::FM_accum,
FrameBufferProperties::FM_alpha | FrameBufferProperties::FM_stereo,
FrameBufferProperties::FM_stencil | FrameBufferProperties::FM_accum | FrameBufferProperties::FM_multisample,
FrameBufferProperties::FM_alpha | FrameBufferProperties::FM_stereo | FrameBufferProperties::FM_multisample,
// All esoteric options removed.
FrameBufferProperties::FM_stencil | FrameBufferProperties::FM_accum | FrameBufferProperties::FM_alpha | FrameBufferProperties::FM_stereo | FrameBufferProperties::FM_multisample,
// All esoteric options, plus some we'd really really prefer,
// removed.
FrameBufferProperties::FM_stencil | FrameBufferProperties::FM_accum | FrameBufferProperties::FM_alpha | FrameBufferProperties::FM_stereo | FrameBufferProperties::FM_multisample | FrameBufferProperties::FM_double_buffer,
// A zero marks the end of the array.
0
};
pset<int> tried_masks;
tried_masks.insert(frame_buffer_mode);
int i;
for (i = 0; visual == NULL && strip_properties[i] != 0; i++) {
int new_frame_buffer_mode = frame_buffer_mode & ~strip_properties[i];
if (tried_masks.insert(new_frame_buffer_mode).second) {
visual = try_for_visual(new_frame_buffer_mode, want_depth_bits,
want_color_bits);
}
}
if (special_size_request) {
tried_masks.clear();
tried_masks.insert(frame_buffer_mode);
if (visual == NULL) {
// Try once more, this time eliminating all of the size
// requests.
for (i = 0; visual == NULL && strip_properties[i] != 0; i++) {
int new_frame_buffer_mode = frame_buffer_mode & ~strip_properties[i];
if (tried_masks.insert(new_frame_buffer_mode).second) {
visual = try_for_visual(new_frame_buffer_mode, 1, 1);
}
}
}
}
if (visual == NULL) {
// Here's our last-ditch desparation attempt: give us any GLX
// visual at all!
visual = try_for_visual(0, 1, 1);
}
if (visual == NULL) {
glxdisplay_cat.error()
<< "Could not get any GLX visual.\n";
return NULL;
}
}
}
glxdisplay_cat.info()
<< "Got visual 0x" << hex << (int)visual->visualid << dec << ".\n";
// Now update our framebuffer_mode and bit depth appropriately.
int render_mode, double_buffer, stereo, red_size, green_size, blue_size,
alpha_size, ared_size, agreen_size, ablue_size, aalpha_size,
depth_size, stencil_size, samples;
glXGetConfig(_display, visual, GLX_RGBA, &render_mode);
glXGetConfig(_display, visual, GLX_DOUBLEBUFFER, &double_buffer);
glXGetConfig(_display, visual, GLX_STEREO, &stereo);
glXGetConfig(_display, visual, GLX_RED_SIZE, &red_size);
glXGetConfig(_display, visual, GLX_GREEN_SIZE, &green_size);
glXGetConfig(_display, visual, GLX_BLUE_SIZE, &blue_size);
glXGetConfig(_display, visual, GLX_ALPHA_SIZE, &alpha_size);
glXGetConfig(_display, visual, GLX_ACCUM_RED_SIZE, &ared_size);
glXGetConfig(_display, visual, GLX_ACCUM_GREEN_SIZE, &agreen_size);
glXGetConfig(_display, visual, GLX_ACCUM_BLUE_SIZE, &ablue_size);
glXGetConfig(_display, visual, GLX_ACCUM_ALPHA_SIZE, &aalpha_size);
glXGetConfig(_display, visual, GLX_DEPTH_SIZE, &depth_size);
glXGetConfig(_display, visual, GLX_STENCIL_SIZE, &stencil_size);
glXGetConfig(_display, visual, GLX_STENCIL_SIZE, &samples);
frame_buffer_mode = 0;
if (double_buffer) {
frame_buffer_mode |= FrameBufferProperties::FM_double_buffer;
}
if (stereo) {
frame_buffer_mode |= FrameBufferProperties::FM_stereo;
}
if (!render_mode) {
frame_buffer_mode |= FrameBufferProperties::FM_index;
}
if (stencil_size != 0) {
frame_buffer_mode |= FrameBufferProperties::FM_stencil;
}
if (depth_size != 0) {
frame_buffer_mode |= FrameBufferProperties::FM_depth;
}
if (alpha_size != 0) {
frame_buffer_mode |= FrameBufferProperties::FM_alpha;
}
if (ared_size + agreen_size + ablue_size != 0) {
frame_buffer_mode |= FrameBufferProperties::FM_accum;
}
if (samples != 0) {
frame_buffer_mode |= FrameBufferProperties::FM_multisample;
}
properties.set_frame_buffer_mode(frame_buffer_mode);
properties.set_color_bits(red_size + green_size + blue_size + alpha_size);
properties.set_depth_bits(depth_size);
if (glxdisplay_cat.is_on(show_visual_severity)) {
glxdisplay_cat.out(show_visual_severity)
<< "GLX Visual Info (# bits of each):" << endl
<< " RGBA: " << red_size << " " << green_size << " " << blue_size
<< " " << alpha_size << endl
<< " Accum RGBA: " << ared_size << " " << agreen_size << " "
<< ablue_size << " " << aalpha_size << endl
<< " Depth: " << depth_size << endl
<< " Stencil: " << stencil_size << endl
<< " Samples: " << samples << endl
<< " DoubleBuffer? " << double_buffer << endl
<< " Stereo? " << stereo << endl;
}
return visual;
}
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::try_for_visual
// Access: Private
// Description: Attempt to get the requested visual, if it is
// available. It's just a wrapper around
// glXChooseVisual(). It returns the visual information
// if possible, or NULL if it is not.
//
// This is an older GLX interface, replaced by the new
// fbconfig interface. However, some implementations of
// GLX may not support fbconfig, so we have to have this
// code as a fallback.
////////////////////////////////////////////////////////////////////
XVisualInfo *glxGraphicsPipe::
try_for_visual(int framebuffer_mode,
int want_depth_bits, int want_color_bits) const {
static const int max_attrib_list = 32;
int attrib_list[max_attrib_list];
int n=0;
glxdisplay_cat.debug()
<< "Trying for visual with: RGB(" << want_color_bits << ")";
int want_color_component_bits;
if (framebuffer_mode & FrameBufferProperties::FM_alpha) {
want_color_component_bits = max(want_color_bits / 4, 1);
} else {
want_color_component_bits = max(want_color_bits / 3, 1);
}
attrib_list[n++] = GLX_RGBA;
attrib_list[n++] = GLX_RED_SIZE;
attrib_list[n++] = want_color_component_bits;
attrib_list[n++] = GLX_GREEN_SIZE;
attrib_list[n++] = want_color_component_bits;
attrib_list[n++] = GLX_BLUE_SIZE;
attrib_list[n++] = want_color_component_bits;
if (framebuffer_mode & FrameBufferProperties::FM_alpha) {
glxdisplay_cat.debug(false) << " ALPHA";
attrib_list[n++] = GLX_ALPHA_SIZE;
attrib_list[n++] = want_color_component_bits;
}
if (framebuffer_mode & FrameBufferProperties::FM_double_buffer) {
glxdisplay_cat.debug(false) << " DOUBLEBUFFER";
attrib_list[n++] = GLX_DOUBLEBUFFER;
}
if (framebuffer_mode & FrameBufferProperties::FM_stereo) {
glxdisplay_cat.debug(false) << " STEREO";
attrib_list[n++] = GLX_STEREO;
}
if (framebuffer_mode & FrameBufferProperties::FM_depth) {
glxdisplay_cat.debug(false) << " DEPTH(" << want_depth_bits << ")";
attrib_list[n++] = GLX_DEPTH_SIZE;
attrib_list[n++] = want_depth_bits;
}
if (framebuffer_mode & FrameBufferProperties::FM_stencil) {
glxdisplay_cat.debug(false) << " STENCIL";
attrib_list[n++] = GLX_STENCIL_SIZE;
attrib_list[n++] = 1;
}
if (framebuffer_mode & FrameBufferProperties::FM_accum) {
glxdisplay_cat.debug(false) << " ACCUM";
attrib_list[n++] = GLX_ACCUM_RED_SIZE;
attrib_list[n++] = want_color_component_bits;
attrib_list[n++] = GLX_ACCUM_GREEN_SIZE;
attrib_list[n++] = want_color_component_bits;
attrib_list[n++] = GLX_ACCUM_BLUE_SIZE;
attrib_list[n++] = want_color_component_bits;
if (framebuffer_mode & FrameBufferProperties::FM_alpha) {
attrib_list[n++] = GLX_ACCUM_ALPHA_SIZE;
attrib_list[n++] = want_color_component_bits;
}
}
if (framebuffer_mode & FrameBufferProperties::FM_multisample) {
glxdisplay_cat.debug(false) << " MULTISAMPLE";
attrib_list[n++] = GLX_SAMPLES;
// We decide 4 is minimum number of samples
attrib_list[n++] = 4;
}
// Terminate the list
nassertr(n < max_attrib_list, NULL);
attrib_list[n] = (int)None;
XVisualInfo *vinfo = glXChooseVisual(_display, _screen, attrib_list);
if (glxdisplay_cat.is_debug()) {
if (vinfo != NULL) {
glxdisplay_cat.debug(false) << ", match found!\n";
} else {
glxdisplay_cat.debug(false) << ", no match.\n";
}
}
return vinfo;
}
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::make_hidden_cursor
// Access: Private
// Description: Called once to make an invisible Cursor for return
// from get_hidden_cursor().
////////////////////////////////////////////////////////////////////
void glxGraphicsPipe::
make_hidden_cursor() {
nassertv(_hidden_cursor == None);
unsigned int x_size, y_size;
XQueryBestCursor(_display, _root, 1, 1, &x_size, &y_size);
Pixmap empty = XCreatePixmap(_display, _root, x_size, y_size, 1);
XColor black;
memset(&black, 0, sizeof(black));
_hidden_cursor = XCreatePixmapCursor(_display, empty, empty,
&black, &black, x_size, y_size);
XFreePixmap(_display, empty);
}
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::release_hidden_cursor
// Access: Private
// Description: Called once to release the invisible cursor created
// by make_hidden_cursor().
////////////////////////////////////////////////////////////////////
void glxGraphicsPipe::
release_hidden_cursor() {
if (_hidden_cursor != None) {
XFreeCursor(_display, _hidden_cursor);
_hidden_cursor = None;
}
}
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::install_error_handlers
// Access: Private, Static
// Description: Installs new Xlib error handler functions if this is
// the first time this function has been called. These
// error handler functions will attempt to reduce Xlib's
// annoying tendency to shut down the client at the
// first error. Unfortunately, it is difficult to play
// nice with the client if it has already installed its
// own error handlers.
////////////////////////////////////////////////////////////////////
void glxGraphicsPipe::
install_error_handlers() {
if (_error_handlers_installed) {
return;
}
_prev_error_handler = (ErrorHandlerFunc *)XSetErrorHandler(error_handler);
_prev_io_error_handler = (IOErrorHandlerFunc *)XSetIOErrorHandler(io_error_handler);
_error_handlers_installed = true;
}
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::error_handler
// Access: Private, Static
// Description: This function is installed as the error handler for a
// non-fatal Xlib error.
////////////////////////////////////////////////////////////////////
int glxGraphicsPipe::
error_handler(Display *display, XErrorEvent *error) {
static const int msg_len = 80;
char msg[msg_len];
XGetErrorText(display, error->error_code, msg, msg_len);
glxdisplay_cat.error()
<< msg << "\n";
if (glx_error_abort) {
abort();
}
// We return to allow the application to continue running, unlike
// the default X error handler which exits.
return 0;
}
////////////////////////////////////////////////////////////////////
// Function: glxGraphicsPipe::io_error_handler
// Access: Private, Static
// Description: This function is installed as the error handler for a
// fatal Xlib error.
////////////////////////////////////////////////////////////////////
int glxGraphicsPipe::
io_error_handler(Display *display) {
glxdisplay_cat.fatal()
<< "X fatal error on display " << (void *)display << "\n";
// Unfortunately, we can't continue from this function, even if we
// promise never to use X again. We're supposed to terminate
// without returning, and if we do return, the caller will exit
// anyway. Sigh. Very poor design on X's part.
return 0;
}
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