xref: /external/mesa3d/src/mapi/glapi/gen/glX_proto_send.py

#!/usr/bin/python2

# (C) Copyright IBM Corporation 2004, 2005
# 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
# on the rights to use, copy, modify, merge, publish, distribute, sub
# license, 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 (including the next
# paragraph) 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 NON-INFRINGEMENT.  IN NO EVENT SHALL
# IBM AND/OR ITS SUPPLIERS 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.
#
# Authors:
#    Ian Romanick <idr@us.ibm.com>

from xml.sax import saxutils
from xml.sax import make_parser
from xml.sax.handler import feature_namespaces

import gl_XML
import glX_XML
import license
import sys, getopt, copy

def hash_pixel_function(func):
	"""Generate a 'unique' key for a pixel function.  The key is based on
	the parameters written in the command packet.  This includes any
	padding that might be added for the original function and the 'NULL
	image' flag."""

	[dim, junk, junk, junk, junk] = func.dimensions()

	d = (dim + 1) & ~1
	h = "%uD%uD_" % (d - 1, d)

	for p in func.parameterIterator(1, 1):
		h = "%s%u" % (h, p.size())

		if func.pad_after(p):
			h += "4"

	if func.image.img_null_flag:
		h += "_NF"

	n = func.name.replace("%uD" % (dim), "")
	n = "__glx_%s_%uD%uD" % (n, d - 1, d)
	return [h, n]


class glXPixelFunctionUtility(glX_XML.glXFunction):
	"""Dummy class used to generate pixel "utility" functions that are
	shared by multiple dimension image functions.  For example, these
	objects are used to generate shared functions used to send GLX
	protocol for TexImage1D and TexImage2D, TexSubImage1D and
	TexSubImage2D, etc."""

	def __init__(self, func, name):
		# The parameters to the utility function are the same as the
		# parameters to the real function except for the added "pad"
		# parameters.

		self.name = name
		self.image = copy.copy(func.image)
		self.fn_parameters = []
		for p in gl_XML.glFunction.parameterIterator(func):
			self.fn_parameters.append(p)

			pad_name = func.pad_after(p)
			if pad_name:
				pad = copy.copy(p)
				pad.name = pad_name
				self.fn_parameters.append(pad)


		if self.image.height == None:
			self.image.height = "height"

		if self.image.img_yoff == None:
			self.image.img_yoff = "yoffset"

		if func.image.depth:
			if self.image.extent == None:
				self.image.extent = "extent"

			if self.image.img_woff == None:
				self.image.img_woff = "woffset"


		self.set_return_type( func.fn_return_type )
		self.glx_rop = ~0
		self.can_be_large = func.can_be_large
		self.count_parameter_list = func.count_parameter_list
		self.counter = func.counter
		return


class PrintGlxProtoStubs(glX_XML.GlxProto):
	def __init__(self):
		glX_XML.GlxProto.__init__(self)
		self.last_category = ""
		self.license = license.bsd_license_template % ( "(C) Copyright IBM Corporation 2004, 2005", "IBM")
		self.generic_sizes = [3, 4, 6, 8, 12, 16, 24, 32]
		self.pixel_stubs = {}
		self.debug = 0
		return

	def printRealHeader(self):
		print ''
		print '#include <GL/gl.h>'
		print '#include "indirect.h"'
		print '#include "glxclient.h"'
		print '#include "indirect_size.h"'
		print '#include <GL/glxproto.h>'
		print ''
		print '#define __GLX_PAD(n) (((n) + 3) & ~3)'
		print ''
		self.printFastcall()
		self.printNoinline()
		print ''
		print '#if !defined __GNUC__ || __GNUC__ < 3'
		print '#  define __builtin_expect(x, y) x'
		print '#endif'
		print ''
		print '/* If the size and opcode values are known at compile-time, this will, on'
		print ' * x86 at least, emit them with a single instruction.'
		print ' */'
		print '#define emit_header(dest, op, size)            \\'
		print '    do { union { short s[2]; int i; } temp;    \\'
		print '         temp.s[0] = (size); temp.s[1] = (op); \\'
		print '         *((int *)(dest)) = temp.i; } while(0)'
		print ''
		print """static NOINLINE CARD32
read_reply( Display *dpy, size_t size, void * dest, GLboolean reply_is_always_array )
{
    xGLXSingleReply reply;

    (void) _XReply(dpy, (xReply *) & reply, 0, False);
    if (size != 0) {
        if ((reply.length > 0) || reply_is_always_array) {
            const GLint bytes = (reply_is_always_array)
              ? (4 * reply.length) : (reply.size * size);
            const GLint extra = 4 - (bytes & 3);

            _XRead(dpy, dest, bytes);
            if ( extra < 4 ) {
                _XEatData(dpy, extra);
            }
        }
        else {
            (void) memcpy( dest, &(reply.pad3), size);
        }
    }

    return reply.retval;
}

#define X_GLXSingle 0

static NOINLINE FASTCALL GLubyte *
setup_single_request( __GLXcontext * gc, GLint sop, GLint cmdlen )
{
    xGLXSingleReq * req;
    Display * const dpy = gc->currentDpy;

    (void) __glXFlushRenderBuffer(gc, gc->pc);
    LockDisplay(dpy);
    GetReqExtra(GLXSingle, cmdlen, req);
    req->reqType = gc->majorOpcode;
    req->contextTag = gc->currentContextTag;
    req->glxCode = sop;
    return (GLubyte *)(req) + sz_xGLXSingleReq;
}

static NOINLINE FASTCALL GLubyte *
setup_vendor_request( __GLXcontext * gc, GLint code, GLint vop, GLint cmdlen )
{
    xGLXVendorPrivateReq * req;
    Display * const dpy = gc->currentDpy;

    (void) __glXFlushRenderBuffer(gc, gc->pc);
    LockDisplay(dpy);
    GetReqExtra(GLXVendorPrivate, cmdlen, req);
    req->reqType = gc->majorOpcode;
    req->glxCode = code;
    req->vendorCode = vop;
    req->contextTag = gc->currentContextTag;
    return (GLubyte *)(req) + sz_xGLXVendorPrivateReq;
}

const GLuint __glXDefaultPixelStore[9] = { 0, 0, 0, 0, 0, 0, 0, 0, 1 };

#define zero                        (__glXDefaultPixelStore+0)
#define one                         (__glXDefaultPixelStore+8)
#define default_pixel_store_1D      (__glXDefaultPixelStore+4)
#define default_pixel_store_1D_size 20
#define default_pixel_store_2D      (__glXDefaultPixelStore+4)
#define default_pixel_store_2D_size 20
#define default_pixel_store_3D      (__glXDefaultPixelStore+0)
#define default_pixel_store_3D_size 36
#define default_pixel_store_4D      (__glXDefaultPixelStore+0)
#define default_pixel_store_4D_size 36
"""

		for size in self.generic_sizes:
			self.print_generic_function(size)
		return

	def printFunction(self, f):
		if f.client_handcode: return

		if f.glx_rop != 0 or f.vectorequiv != None:
			if f.image:
				self.printPixelFunction(f)
			else:
				self.printRenderFunction(f)
		elif f.glx_sop != 0 or f.glx_vendorpriv != 0:
			self.printSingleFunction(f)
		else:
			print "/* Missing GLX protocol for %s. */" % (f.name)

	def print_generic_function(self, n):
		size = (n + 3) & ~3
		print """static FASTCALL NOINLINE void
generic_%u_byte( GLint rop, const void * ptr )
{
    __GLXcontext * const gc = __glXGetCurrentContext();
    const GLuint cmdlen = %u;

    emit_header(gc->pc, rop, cmdlen);
    (void) memcpy((void *)(gc->pc + 4), ptr, %u);
    gc->pc += cmdlen;
    if (__builtin_expect(gc->pc > gc->limit, 0)) { (void) __glXFlushRenderBuffer(gc, gc->pc); }
}
""" % (n, size + 4, size)


	def common_emit_one_arg(self, p, offset, pc, indent, adjust):
		t = p.p_type
		if p.is_array():
			src_ptr = p.name
		else:
			src_ptr = "&" + p.name

		print '%s    (void) memcpy((void *)(%s + %u), (void *)(%s), %s);' \
			% (indent, pc, offset + adjust, src_ptr, p.size_string() )

	def common_emit_args(self, f, pc, indent, adjust, skip_vla):
		offset = 0

		if skip_vla:
			r = 1
		else:
			r = 2

		for p in f.parameterIterator(1, r):
			self.common_emit_one_arg(p, offset, pc, indent, adjust)
			offset += p.size()

		return offset


	def pixel_emit_args(self, f, pc, indent, adjust, dim, large):
		"""Emit the arguments for a pixel function.  This differs from
		common_emit_args in that pixel functions may require padding
		be inserted (i.e., for the missing width field for
		TexImage1D), and they may also require a 'NULL image' flag
		be inserted before the image data."""

		offset = 0
		for p in f.parameterIterator(1, 1):
			self.common_emit_one_arg(p, offset, pc, indent, adjust)
			offset += p.size()

			if f.pad_after(p):
				print '%s    (void) memcpy((void *)(%s + %u), zero, 4);' % (indent, pc, offset + adjust)
				offset += 4

		if f.image.img_null_flag:
			if large:
				print '%s    (void) memcpy((void *)(%s + %u), zero, 4);' % (indent, pc, offset + adjust)
			else:
				print '%s    (void) memcpy((void *)(%s + %u), (void *)((%s == NULL) ? one : zero), 4);' % (indent, pc, offset + adjust, f.image.name)

			offset += 4

		return offset


	def large_emit_begin(self, indent, f, op_name = None):
		if not op_name:
			op_name = f.opcode_real_name()

		print '%s    const GLint op = %s;' % (indent, op_name)
		print '%s    const GLuint cmdlenLarge = cmdlen + 4;' % (indent)
		print '%s    GLubyte * const pc = __glXFlushRenderBuffer(gc, gc->pc);' % (indent)
		print '%s    (void) memcpy((void *)(pc + 0), (void *)(&cmdlenLarge), 4);' % (indent)
		print '%s    (void) memcpy((void *)(pc + 4), (void *)(&op), 4);' % (indent)
		return


	def common_func_print_just_header(self, f):
		print '#define %s %d' % (f.opcode_name(), f.opcode_value())

		print '%s' % (f.fn_return_type)
		print '__indirect_gl%s(%s)' % (f.name, f.get_parameter_string())
		print '{'


	def common_func_print_just_start(self, f):
		print '    __GLXcontext * const gc = __glXGetCurrentContext();'

		# The only reason that single and vendor private commands need
		# a variable called 'dpy' is becuase they use the SyncHandle
		# macro.  For whatever brain-dead reason, that macro is hard-
		# coded to use a variable called 'dpy' instead of taking a
		# parameter.

		if not f.glx_rop:
			print '    Display * const dpy = gc->currentDpy;'
			skip_condition = "dpy != NULL"
		elif f.can_be_large:
			skip_condition = "gc->currentDpy != NULL"
		else:
			skip_condition = None


		if f.fn_return_type != 'void':
			print '    %s retval = (%s) 0;' % (f.fn_return_type, f.fn_return_type)

		if not f.output_parameter():
			compsize = self.size_call( f )
			if compsize:
				print '    const GLuint compsize = %s;' % (compsize)

		print '    const GLuint cmdlen = %s;' % (f.command_length())

		if f.counter:
			if skip_condition:
				skip_condition = "(%s >= 0) && (%s)" % (f.counter, skip_condition)
			else:
				skip_condition = "%s >= 0" % (f.counter)


		if skip_condition:
			print '    if (__builtin_expect(%s, 1)) {' % (skip_condition)
			return 1
		else:
			return 0


	def common_func_print_header(self, f):
		self.common_func_print_just_header(f)
		return self.common_func_print_just_start(f)



	def printSingleFunction(self, f):
		self.common_func_print_header(f)

		if self.debug:
			print '        printf( "Enter %%s...\\n", "gl%s" );' % (f.name)

		if f.fn_parameters != []:
			pc_decl = "GLubyte const * pc ="
		else:
			pc_decl = "(void)"

		if f.glx_vendorpriv != 0:
			print '        %s setup_vendor_request(gc, %s, %s, cmdlen);' % (pc_decl, f.opcode_real_name(), f.opcode_name())
		else:
			print '        %s setup_single_request(gc, %s, cmdlen);' % (pc_decl, f.opcode_name())

		self.common_emit_args(f, "pc", "    ", 0, 0)

		if f.needs_reply():
			if f.output != None:
				output_size = f.output.p_type.size
				output_str = f.output.name
			else:
				output_size = 0
				output_str = "NULL"

			if f.fn_return_type != 'void':
				return_str = " retval = (%s)" % (f.fn_return_type)
			else:
				return_str = " (void)"

			if f.reply_always_array:
				aa = "GL_TRUE"
			else:
				aa = "GL_FALSE"

			print "       %s read_reply(dpy, %s, %s, %s);" % (return_str, output_size, output_str, aa)
		elif self.debug:
			# Only emit the extra glFinish call for functions
			# that don't already require a reply from the server.
			print '        __indirect_glFinish();'

		if self.debug:
			print '        printf( "Exit %%s.\\n", "gl%s" );' % (f.name)


		print '        UnlockDisplay(dpy); SyncHandle();'
		print '    }'
		print '    %s' % f.return_string()
		print '}'
		print ''
		return


	def printPixelFunction(self, f):
		"""This function could use some major refactoring. :("""

		# There is a code-space optimization that we can do here.
		# Functions that are marked img_pad_dimensions have a version
		# with an odd number of dimensions and an even number of
		# dimensions.  TexSubImage1D and TexSubImage2D are examples.
		# We can emit a single function that does both, and have the
		# real functions call the utility function with the correct
		# parameters.
		#
		# The only quirk to this is that utility funcitons will be
		# generated for 3D and 4D functions, but 4D (e.g.,
		# GL_SGIS_texture4D) isn't typically supported.  This is
		# probably not an issue.  However, it would be possible to
		# look at the total set of functions and determine if there
		# is another function that would actually use the utility
		# function.  If not, then fallback to the normal way of
		# generating code.

		if f.image.img_pad_dimensions:
			# Determine the hash key and the name for the utility
			# function that is used to implement the real
			# function.

			[h, n] = hash_pixel_function(f)


			# If the utility function is not yet known, generate
			# it.

			if not self.pixel_stubs.has_key(h):
				self.pixel_stubs[h] = n
				pixel_func = glXPixelFunctionUtility(f, n)

				print 'static void'
				print '%s( unsigned opcode, unsigned dim, %s )' % (n, pixel_func.get_parameter_string())
				print '{'

				if self.common_func_print_just_start(pixel_func):
					indent = "    "
					trailer = "    }"
				else:
					indent = ""
					trailer = None


				if pixel_func.can_be_large:
					print '%s    if (cmdlen <= gc->maxSmallRenderCommandSize) {' % (indent)
					print '%s        if ( (gc->pc + cmdlen) > gc->bufEnd ) {' % (indent)
					print '%s            (void) __glXFlushRenderBuffer(gc, gc->pc);' % (indent)
					print '%s        }' % (indent)
					indent += "    "

				[dim, width, height, depth, extent] = pixel_func.dimensions()
				adjust = pixel_func.offset_of_first_parameter() + 4

				print '%s    emit_header(gc->pc, opcode, cmdlen);' % (indent)

				offset = self.pixel_emit_args(pixel_func, "gc->pc", indent, adjust, dim, 0)

				s = pixel_func.command_fixed_length()

				pixHeaderPtr = "gc->pc + 4"
				pcPtr = "gc->pc + %u" % (s + 4)

				if pixel_func.image.img_send_null:
					condition = '(compsize > 0) && (%s != NULL)' % (pixel_func.image.name)
				else:
					condition = 'compsize > 0'

				print '%s    if (%s) {' % (indent, condition)
				print '%s        (*gc->fillImage)(gc, dim, %s, %s, %s, %s, %s, %s, %s, %s);' % (indent, width, height, depth, pixel_func.image.img_format, pixel_func.image.img_type, pixel_func.image.name, pcPtr, pixHeaderPtr)
				print '%s    }' % (indent)
				print '%s    else {' % (indent)
				print '%s        (void) memcpy( %s, default_pixel_store_%uD, default_pixel_store_%uD_size );' % (indent, pixHeaderPtr, dim, dim)
				print '%s    }' % (indent)

				print '%s    gc->pc += cmdlen;' % (indent)
				print '%s    if (gc->pc > gc->limit) { (void) __glXFlushRenderBuffer(gc, gc->pc); }' % (indent)

				if f.can_be_large:
					adjust += 4

					print '%s}' % (indent)
					print '%selse {' % (indent)

					self.large_emit_begin(indent, pixel_func, "opcode")
					offset = self.pixel_emit_args(pixel_func, "pc", indent, adjust, dim, 1)

					pixHeaderPtr = "pc + 8"
					pcPtr = "pc + %u" % (s + 8)

					print '%s    __glXSendLargeImage(gc, compsize, dim, %s, %s, %s, %s, %s, %s, %s, %s);' % (indent, width, height, depth, f.image.img_format, f.image.img_type, f.image.name, pcPtr, pixHeaderPtr)

					print '%s}' % (indent)

				if trailer: print trailer
				print '}'
				print ''



			# Generate the real function as a call to the
			# utility function.

			self.common_func_print_just_header(f)

			[dim, junk, junk, junk, junk] = f.dimensions()

			p_string = ""
			for p in gl_XML.glFunction.parameterIterator(f):
				p_string += ", " + p.name

				if f.pad_after(p):
					p_string += ", 1"

			print '    %s(%s, %u%s );' % (n, f.opcode_name(), dim, p_string)
			print '}'
			print ''
			return


		if self.common_func_print_header(f):
			indent = "    "
			trailer = "    }"
		else:
			indent = ""
			trailer = None


		if f.can_be_large:
			print '%s    if (cmdlen <= gc->maxSmallRenderCommandSize) {' % (indent)
			print '%s        if ( (gc->pc + cmdlen) > gc->bufEnd ) {' % (indent)
			print '%s            (void) __glXFlushRenderBuffer(gc, gc->pc);' % (indent)
			print '%s        }' % (indent)
			indent += "    "

		[dim, width, height, depth, extent] = f.dimensions()
		adjust = f.offset_of_first_parameter() + 4

		print '%s    emit_header(gc->pc, %s, cmdlen);' % (indent, f.opcode_real_name())

		offset = self.pixel_emit_args(f, "gc->pc", indent, adjust, dim, 0)

		s = f.command_fixed_length()

		pixHeaderPtr = "gc->pc + 4"
		pcPtr = "gc->pc + %u" % (s + 4)

		if f.image.img_send_null:
			condition = '(compsize > 0) && (%s != NULL)' % (f.image.name)
		else:
			condition = 'compsize > 0'

		print '%s    if (%s) {' % (indent, condition)
		print '%s        (*gc->fillImage)(gc, %u, %s, %s, %s, %s, %s, %s, %s, %s);' % (indent, dim, width, height, depth, f.image.img_format, f.image.img_type, f.image.name, pcPtr, pixHeaderPtr)
		print '%s    }' % (indent)
		print '%s    else {' % (indent)
		print '%s        (void) memcpy( %s, default_pixel_store_%uD, default_pixel_store_%uD_size );' % (indent, pixHeaderPtr, dim, dim)
		print '%s    }' % (indent)

		print '%s    gc->pc += cmdlen;' % (indent)
		print '%s    if (gc->pc > gc->limit) { (void) __glXFlushRenderBuffer(gc, gc->pc); }' % (indent)

		if f.can_be_large:
			adjust += 4

			print '%s}' % (indent)
			print '%selse {' % (indent)

			self.large_emit_begin(indent, f)
			offset = self.pixel_emit_args(f, "pc", indent, adjust, dim, 1)

			pixHeaderPtr = "pc + 8"
			pcPtr = "pc + %u" % (s + 8)

			print '%s    __glXSendLargeImage(gc, compsize, %u, %s, %s, %s, %s, %s, %s, %s, %s);' % (indent, dim, width, height, depth, f.image.img_format, f.image.img_type, f.image.name, pcPtr, pixHeaderPtr)

			print '%s}' % (indent)

		if trailer: print trailer
		print '}'
		print ''
		return


	def printRenderFunction(self, f):
		# There is a class of GL functions that take a single pointer
		# as a parameter.  This pointer points to a fixed-size chunk
		# of data, and the protocol for this functions is very
		# regular.  Since they are so regular and there are so many
		# of them, special case them with generic functions.  On
		# x86, this saves about 26KB in the libGL.so binary.

		if f.variable_length_parameter() == None and len(f.fn_parameters) == 1:
			p = f.fn_parameters[0]
			if p.is_pointer:
				cmdlen = f.command_fixed_length()
				if cmdlen in self.generic_sizes:
					self.common_func_print_just_header(f)
					print '    generic_%u_byte( %s, %s );' % (cmdlen, f.opcode_real_name(), p.name)
					print '}'
					print ''
					return

		if self.common_func_print_header(f):
			indent = "    "
			trailer = "    }"
		else:
			indent = ""
			trailer = None

		if self.debug:
			print '%s    printf( "Enter %%s...\\n", "gl%s" );' % (indent, f.name)

		if f.can_be_large:
			print '%s    if (cmdlen <= gc->maxSmallRenderCommandSize) {' % (indent)
			print '%s        if ( (gc->pc + cmdlen) > gc->bufEnd ) {' % (indent)
			print '%s            (void) __glXFlushRenderBuffer(gc, gc->pc);' % (indent)
			print '%s        }' % (indent)
			indent += "    "

		print '%s    emit_header(gc->pc, %s, cmdlen);' % (indent, f.opcode_real_name())

		self.common_emit_args(f, "gc->pc", indent, 4, 0)
		print '%s    gc->pc += cmdlen;' % (indent)
		print '%s    if (__builtin_expect(gc->pc > gc->limit, 0)) { (void) __glXFlushRenderBuffer(gc, gc->pc); }' % (indent)

		if f.can_be_large:
			print '%s}' % (indent)
			print '%selse {' % (indent)

			self.large_emit_begin(indent, f)
			offset = self.common_emit_args(f, "pc", indent, 8, 1)

			p = f.variable_length_parameter()
			print '%s    __glXSendLargeCommand(gc, pc, %u, %s, %s);' % (indent, offset + 8, p.name, p.size_string())
			print '%s}' % (indent)

		if self.debug:
			print '%s    __indirect_glFinish();' % (indent)
			print '%s    printf( "Exit %%s.\\n", "gl%s" );' % (indent, f.name)

		if trailer: print trailer
		print '}'
		print ''
		return


class PrintGlxProtoInit_c(glX_XML.GlxProto):
	def __init__(self):
		glX_XML.GlxProto.__init__(self)
		self.last_category = ""
		self.license = license.bsd_license_template % ( \
"""Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
(C) Copyright IBM Corporation 2004""", "PRECISION INSIGHT, IBM")


	def printRealHeader(self):
		print """/**
 * \\file indirect_init.c
 * Initialize indirect rendering dispatch table.
 *
 * \\author Kevin E. Martin <kevin@precisioninsight.com>
 * \\author Brian Paul <brian@precisioninsight.com>
 * \\author Ian Romanick <idr@us.ibm.com>
 */

#include "indirect_init.h"
#include "indirect.h"
#include "glapi.h"


/**
 * No-op function used to initialize functions that have no GLX protocol
 * support.
 */
static int NoOp(void)
{
    return 0;
}

/**
 * Create and initialize a new GL dispatch table.  The table is initialized
 * with GLX indirect rendering protocol functions.
 */
__GLapi * __glXNewIndirectAPI( void )
{
    __GLapi *glAPI;
    GLuint entries;

    entries = _glapi_get_dispatch_table_size();
    glAPI = (__GLapi *) Xmalloc(entries * sizeof(void *));

    /* first, set all entries to point to no-op functions */
    {
       int i;
       void **dispatch = (void **) glAPI;
       for (i = 0; i < entries; i++) {
          dispatch[i] = (void *) NoOp;
       }
    }

    /* now, initialize the entries we understand */"""

	def printRealFooter(self):
		print """
    return glAPI;
}
"""

	def printFunction(self, f):
		if f.category != self.last_category:
			self.last_category = f.category
			print ''
			print '    /* %s */' % (self.last_category)
			print ''

		print '    glAPI->%s = __indirect_gl%s;' % (f.name, f.name)


class PrintGlxProtoInit_h(glX_XML.GlxProto):
	def __init__(self):
		glX_XML.GlxProto.__init__(self)
		self.last_category = ""
		self.license = license.bsd_license_template % ( \
"""Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
(C) Copyright IBM Corporation 2004""", "PRECISION INSIGHT, IBM")
		self.header_tag = "_INDIRECT_H_"

	def printRealHeader(self):
		print """/**
 * \\file
 * Prototypes for indirect rendering functions.
 *
 * \\author Kevin E. Martin <kevin@precisioninsight.com>
 * \\author Ian Romanick <idr@us.ibm.com>
 */
"""
		self.printVisibility( "HIDDEN", "hidden" )


	def printFunction(self, f):
		print 'extern HIDDEN %s __indirect_gl%s(%s);' % (f.fn_return_type, f.name, f.get_parameter_string())


def show_usage():
	print "Usage: %s [-f input_file_name] [-m output_mode] [-d]" % sys.argv[0]
	print "    -m output_mode   Output mode can be one of 'proto', 'init_c' or 'init_h'."
	print "    -d               Enable extra debug information in the generated code."
	sys.exit(1)


if __name__ == '__main__':
	file_name = "gl_API.xml"

	try:
		(args, trail) = getopt.getopt(sys.argv[1:], "f:m:d")
	except Exception,e:
		show_usage()

	debug = 0
	mode = "proto"
	for (arg,val) in args:
		if arg == "-f":
			file_name = val
		elif arg == "-m":
			mode = val
		elif arg == "-d":
			debug = 1

	if mode == "proto":
		dh = PrintGlxProtoStubs()
	elif mode == "init_c":
		dh = PrintGlxProtoInit_c()
	elif mode == "init_h":
		dh = PrintGlxProtoInit_h()
	else:
		show_usage()

	parser = make_parser()
	parser.setFeature(feature_namespaces, 0)
	parser.setContentHandler(dh)

	f = open(file_name)

	dh.debug = debug
	dh.printHeader()
	parser.parse(f)
	dh.printFooter()