src/parsec/disk-image/parsec/parsec-benchmark/pkgs/libs/mesa/src/src/mesa/main/polygon.c - public/gem5-resources - Git at Google

 /**
  * \file polygon.c
  * Polygon operations.
  */

 /*
  * Mesa 3-D graphics library
  * Version:  6.5.1
  *
  * Copyright (C) 1999-2006  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.
  */


 #include "glheader.h"
 #include "imports.h"
 #include "bufferobj.h"
 #include "context.h"
 #include "image.h"
 #include "enums.h"
 #include "macros.h"
 #include "polygon.h"
 #include "mtypes.h"


 /**
  * Specify whether to cull front- or back-facing facets.
  *
  * \param mode culling mode.
  *
  * \sa glCullFace().
  *
  * Verifies the parameter and updates gl_polygon_attrib::CullFaceMode. On
  * change, flushes the vertices and notifies the driver via
  * the dd_function_table::CullFace callback.
  */
 void GLAPIENTRY
 _mesa_CullFace( GLenum mode )
 {
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END(ctx);

    if (MESA_VERBOSE&VERBOSE_API)
       _mesa_debug(ctx, "glCullFace %s\n", _mesa_lookup_enum_by_nr(mode));

    if (mode!=GL_FRONT && mode!=GL_BACK && mode!=GL_FRONT_AND_BACK) {
       _mesa_error( ctx, GL_INVALID_ENUM, "glCullFace" );
       return;
    }

    if (ctx->Polygon.CullFaceMode == mode)
       return;

    FLUSH_VERTICES(ctx, _NEW_POLYGON);
    ctx->Polygon.CullFaceMode = mode;

    if (ctx->Driver.CullFace)
       ctx->Driver.CullFace( ctx, mode );
 }


 /**
  * Define front- and back-facing
  *
  * \param mode orientation of front-facing polygons.
  *
  * \sa glFrontFace().
  *
  * Verifies the parameter and updates gl_polygon_attrib::FrontFace. On change
  * flushes the vertices and notifies the driver via
  * the dd_function_table::FrontFace callback.
  */
 void GLAPIENTRY
 _mesa_FrontFace( GLenum mode )
 {
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END(ctx);

    if (MESA_VERBOSE&VERBOSE_API)
       _mesa_debug(ctx, "glFrontFace %s\n", _mesa_lookup_enum_by_nr(mode));

    if (mode!=GL_CW && mode!=GL_CCW) {
       _mesa_error( ctx, GL_INVALID_ENUM, "glFrontFace" );
       return;
    }

    if (ctx->Polygon.FrontFace == mode)
       return;

    FLUSH_VERTICES(ctx, _NEW_POLYGON);
    ctx->Polygon.FrontFace = mode;

    ctx->Polygon._FrontBit = (GLboolean) (mode == GL_CW);

    if (ctx->Driver.FrontFace)
       ctx->Driver.FrontFace( ctx, mode );
 }


 /**
  * Set the polygon rasterization mode.
  *
  * \param face the polygons which \p mode applies to.
  * \param mode how polygons should be rasterized.
  *
  * \sa glPolygonMode().
  *
  * Verifies the parameters and updates gl_polygon_attrib::FrontMode and
  * gl_polygon_attrib::BackMode. On change flushes the vertices and notifies the
  * driver via the dd_function_table::PolygonMode callback.
  */
 void GLAPIENTRY
 _mesa_PolygonMode( GLenum face, GLenum mode )
 {
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END(ctx);

    if (MESA_VERBOSE&VERBOSE_API)
       _mesa_debug(ctx, "glPolygonMode %s %s\n",
                   _mesa_lookup_enum_by_nr(face),
                   _mesa_lookup_enum_by_nr(mode));

    if (mode!=GL_POINT && mode!=GL_LINE && mode!=GL_FILL) {
       _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(mode)" );
       return;
    }

    switch (face) {
    case GL_FRONT:
       if (ctx->Polygon.FrontMode == mode)
 	 return;
       FLUSH_VERTICES(ctx, _NEW_POLYGON);
       ctx->Polygon.FrontMode = mode;
       break;
    case GL_FRONT_AND_BACK:
       if (ctx->Polygon.FrontMode == mode &&
 	  ctx->Polygon.BackMode == mode)
 	 return;
       FLUSH_VERTICES(ctx, _NEW_POLYGON);
       ctx->Polygon.FrontMode = mode;
       ctx->Polygon.BackMode = mode;
       break;
    case GL_BACK:
       if (ctx->Polygon.BackMode == mode)
 	 return;
       FLUSH_VERTICES(ctx, _NEW_POLYGON);
       ctx->Polygon.BackMode = mode;
       break;
    default:
       _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
       return;
    }

    if (ctx->Polygon.FrontMode == GL_FILL && ctx->Polygon.BackMode == GL_FILL)
       ctx->_TriangleCaps &= ~DD_TRI_UNFILLED;
    else
       ctx->_TriangleCaps |= DD_TRI_UNFILLED;

    if (ctx->Driver.PolygonMode)
       ctx->Driver.PolygonMode(ctx, face, mode);
 }

 #if _HAVE_FULL_GL


 /**
  * This routine updates the ctx->Polygon.Stipple state.
  * If we're getting the stipple data from a PBO, we map the buffer
  * in order to access the data.
  * In any case, we obey the current pixel unpacking parameters when fetching
  * the stipple data.
  *
  * In the future, this routine should be used as a fallback, called via
  * ctx->Driver.PolygonStipple().  We'll have to update all the DRI drivers
  * too.
  */
 void
 _mesa_polygon_stipple(GLcontext *ctx, const GLubyte *pattern)
 {
    if (ctx->Unpack.BufferObj->Name) {
       /* Get/unpack the stipple pattern from a PBO */
       GLubyte *buf;
       if (!_mesa_validate_pbo_access(2, &ctx->Unpack, 32, 32, 1,
                                      GL_COLOR_INDEX, GL_BITMAP, pattern)) {
          _mesa_error(ctx, GL_INVALID_OPERATION,
                      "glPolygonStipple(bad PBO access)");
          return;
       }
       buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
                                               GL_READ_ONLY_ARB,
                                               ctx->Unpack.BufferObj);
       if (!buf) {
          _mesa_error(ctx, GL_INVALID_OPERATION,
                      "glPolygonStipple(PBO mapped)");
          return;
       }
       buf = ADD_POINTERS(buf, pattern);
       _mesa_unpack_polygon_stipple(buf, ctx->PolygonStipple, &ctx->Unpack);
       ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
                               ctx->Unpack.BufferObj);
    }
    else {
       /* Get/unpack the stipple pattern from user memory */
       _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);
    }
 }


 /**
  * Called by glPolygonStipple.
  */
 void GLAPIENTRY
 _mesa_PolygonStipple( const GLubyte *pattern )
 {
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END(ctx);

    if (MESA_VERBOSE&VERBOSE_API)
       _mesa_debug(ctx, "glPolygonStipple\n");

    FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE);

    _mesa_polygon_stipple(ctx, pattern);

    if (ctx->Driver.PolygonStipple)
       ctx->Driver.PolygonStipple(ctx, pattern);
 }


 /**
  * Called by glPolygonStipple.
  */
 void GLAPIENTRY
 _mesa_GetPolygonStipple( GLubyte *dest )
 {
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END(ctx);

    if (MESA_VERBOSE&VERBOSE_API)
       _mesa_debug(ctx, "glGetPolygonStipple\n");

    /* XXX someday we may put this code into a separate function and call
     * it with ctx->Driver.GetPolygonStipple().
     */
    if (ctx->Pack.BufferObj->Name) {
       /* Put/pack the stipple pattern into a PBO */
       GLubyte *buf;
       if (!_mesa_validate_pbo_access(2, &ctx->Pack, 32, 32, 1,
                                      GL_COLOR_INDEX, GL_BITMAP, dest)) {
          _mesa_error(ctx, GL_INVALID_OPERATION,
                      "glGetPolygonStipple(bad PBO access)");
          return;
       }
       buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                                               GL_WRITE_ONLY_ARB,
                                               ctx->Pack.BufferObj);
       if (!buf) {
          _mesa_error(ctx, GL_INVALID_OPERATION,
                      "glGetPolygonStipple(PBO mapped)");
          return;
       }
       buf = ADD_POINTERS(buf, dest);
       _mesa_pack_polygon_stipple(ctx->PolygonStipple, buf, &ctx->Pack);
       ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                               ctx->Pack.BufferObj);
    }
    else {
       /* Put/pack the stipple pattern into user memory */
       _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);
    }
 }


 void GLAPIENTRY
 _mesa_PolygonOffset( GLfloat factor, GLfloat units )
 {
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END(ctx);

    if (MESA_VERBOSE&VERBOSE_API)
       _mesa_debug(ctx, "glPolygonOffset %f %f\n", factor, units);

    if (ctx->Polygon.OffsetFactor == factor &&
        ctx->Polygon.OffsetUnits == units)
       return;

    FLUSH_VERTICES(ctx, _NEW_POLYGON);
    ctx->Polygon.OffsetFactor = factor;
    ctx->Polygon.OffsetUnits = units;

    if (ctx->Driver.PolygonOffset)
       ctx->Driver.PolygonOffset( ctx, factor, units );
 }


 void GLAPIENTRY
 _mesa_PolygonOffsetEXT( GLfloat factor, GLfloat bias )
 {
    GET_CURRENT_CONTEXT(ctx);
    /* XXX mult by DepthMaxF here??? */
    _mesa_PolygonOffset(factor, bias * ctx->DrawBuffer->_DepthMaxF );
 }

 #endif


 /**********************************************************************/
 /** \name Initialization */
 /*@{*/

 /**
  * Initialize the context polygon state.
  *
  * \param ctx GL context.
  *
  * Initializes __GLcontextRec::Polygon and __GLcontextRec::PolygonStipple
  * attribute groups.
  */
 void _mesa_init_polygon( GLcontext * ctx )
 {
    /* Polygon group */
    ctx->Polygon.CullFlag = GL_FALSE;
    ctx->Polygon.CullFaceMode = GL_BACK;
    ctx->Polygon.FrontFace = GL_CCW;
    ctx->Polygon._FrontBit = 0;
    ctx->Polygon.FrontMode = GL_FILL;
    ctx->Polygon.BackMode = GL_FILL;
    ctx->Polygon.SmoothFlag = GL_FALSE;
    ctx->Polygon.StippleFlag = GL_FALSE;
    ctx->Polygon.OffsetFactor = 0.0F;
    ctx->Polygon.OffsetUnits = 0.0F;
    ctx->Polygon.OffsetPoint = GL_FALSE;
    ctx->Polygon.OffsetLine = GL_FALSE;
    ctx->Polygon.OffsetFill = GL_FALSE;


    /* Polygon Stipple group */
    MEMSET( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );
 }

 /*@}*/
	/**
	* \file polygon.c
	* Polygon operations.
	*/

	/*
	* Mesa 3-D graphics library
	* Version: 6.5.1
	*
	* Copyright (C) 1999-2006 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.
	*/


	#include "glheader.h"
	#include "imports.h"
	#include "bufferobj.h"
	#include "context.h"
	#include "image.h"
	#include "enums.h"
	#include "macros.h"
	#include "polygon.h"
	#include "mtypes.h"


	/**
	* Specify whether to cull front- or back-facing facets.
	*
	* \param mode culling mode.
	*
	* \sa glCullFace().
	*
	* Verifies the parameter and updates gl_polygon_attrib::CullFaceMode. On
	* change, flushes the vertices and notifies the driver via
	* the dd_function_table::CullFace callback.
	*/
	void GLAPIENTRY
	_mesa_CullFace( GLenum mode )
	{
	GET_CURRENT_CONTEXT(ctx);
	ASSERT_OUTSIDE_BEGIN_END(ctx);

	if (MESA_VERBOSE&VERBOSE_API)
	_mesa_debug(ctx, "glCullFace %s\n", _mesa_lookup_enum_by_nr(mode));

	if (mode!=GL_FRONT && mode!=GL_BACK && mode!=GL_FRONT_AND_BACK) {
	_mesa_error( ctx, GL_INVALID_ENUM, "glCullFace" );
	return;
	}

	if (ctx->Polygon.CullFaceMode == mode)
	return;

	FLUSH_VERTICES(ctx, _NEW_POLYGON);
	ctx->Polygon.CullFaceMode = mode;

	if (ctx->Driver.CullFace)
	ctx->Driver.CullFace( ctx, mode );
	}


	/**
	* Define front- and back-facing
	*
	* \param mode orientation of front-facing polygons.
	*
	* \sa glFrontFace().
	*
	* Verifies the parameter and updates gl_polygon_attrib::FrontFace. On change
	* flushes the vertices and notifies the driver via
	* the dd_function_table::FrontFace callback.
	*/
	void GLAPIENTRY
	_mesa_FrontFace( GLenum mode )
	{
	GET_CURRENT_CONTEXT(ctx);
	ASSERT_OUTSIDE_BEGIN_END(ctx);

	if (MESA_VERBOSE&VERBOSE_API)
	_mesa_debug(ctx, "glFrontFace %s\n", _mesa_lookup_enum_by_nr(mode));

	if (mode!=GL_CW && mode!=GL_CCW) {
	_mesa_error( ctx, GL_INVALID_ENUM, "glFrontFace" );
	return;
	}

	if (ctx->Polygon.FrontFace == mode)
	return;

	FLUSH_VERTICES(ctx, _NEW_POLYGON);
	ctx->Polygon.FrontFace = mode;

	ctx->Polygon._FrontBit = (GLboolean) (mode == GL_CW);

	if (ctx->Driver.FrontFace)
	ctx->Driver.FrontFace( ctx, mode );
	}


	/**
	* Set the polygon rasterization mode.
	*
	* \param face the polygons which \p mode applies to.
	* \param mode how polygons should be rasterized.
	*
	* \sa glPolygonMode().
	*
	* Verifies the parameters and updates gl_polygon_attrib::FrontMode and
	* gl_polygon_attrib::BackMode. On change flushes the vertices and notifies the
	* driver via the dd_function_table::PolygonMode callback.
	*/
	void GLAPIENTRY
	_mesa_PolygonMode( GLenum face, GLenum mode )
	{
	GET_CURRENT_CONTEXT(ctx);
	ASSERT_OUTSIDE_BEGIN_END(ctx);

	if (MESA_VERBOSE&VERBOSE_API)
	_mesa_debug(ctx, "glPolygonMode %s %s\n",
	_mesa_lookup_enum_by_nr(face),
	_mesa_lookup_enum_by_nr(mode));

	if (mode!=GL_POINT && mode!=GL_LINE && mode!=GL_FILL) {
	_mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(mode)" );
	return;
	}

	switch (face) {
	case GL_FRONT:
	if (ctx->Polygon.FrontMode == mode)
	return;
	FLUSH_VERTICES(ctx, _NEW_POLYGON);
	ctx->Polygon.FrontMode = mode;
	break;
	case GL_FRONT_AND_BACK:
	if (ctx->Polygon.FrontMode == mode &&
	ctx->Polygon.BackMode == mode)
	return;
	FLUSH_VERTICES(ctx, _NEW_POLYGON);
	ctx->Polygon.FrontMode = mode;
	ctx->Polygon.BackMode = mode;
	break;
	case GL_BACK:
	if (ctx->Polygon.BackMode == mode)
	return;
	FLUSH_VERTICES(ctx, _NEW_POLYGON);
	ctx->Polygon.BackMode = mode;
	break;
	default:
	_mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
	return;
	}

	if (ctx->Polygon.FrontMode == GL_FILL && ctx->Polygon.BackMode == GL_FILL)
	ctx->_TriangleCaps &= ~DD_TRI_UNFILLED;
	else
	ctx->_TriangleCaps \|= DD_TRI_UNFILLED;

	if (ctx->Driver.PolygonMode)
	ctx->Driver.PolygonMode(ctx, face, mode);
	}

	#if _HAVE_FULL_GL


	/**
	* This routine updates the ctx->Polygon.Stipple state.
	* If we're getting the stipple data from a PBO, we map the buffer
	* in order to access the data.
	* In any case, we obey the current pixel unpacking parameters when fetching
	* the stipple data.
	*
	* In the future, this routine should be used as a fallback, called via
	* ctx->Driver.PolygonStipple(). We'll have to update all the DRI drivers
	* too.
	*/
	void
	_mesa_polygon_stipple(GLcontext ctx, const GLubyte pattern)
	{
	if (ctx->Unpack.BufferObj->Name) {
	/* Get/unpack the stipple pattern from a PBO */
	GLubyte *buf;
	if (!_mesa_validate_pbo_access(2, &ctx->Unpack, 32, 32, 1,
	GL_COLOR_INDEX, GL_BITMAP, pattern)) {
	_mesa_error(ctx, GL_INVALID_OPERATION,
	"glPolygonStipple(bad PBO access)");
	return;
	}
	buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
	GL_READ_ONLY_ARB,
	ctx->Unpack.BufferObj);
	if (!buf) {
	_mesa_error(ctx, GL_INVALID_OPERATION,
	"glPolygonStipple(PBO mapped)");
	return;
	}
	buf = ADD_POINTERS(buf, pattern);
	_mesa_unpack_polygon_stipple(buf, ctx->PolygonStipple, &ctx->Unpack);
	ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
	ctx->Unpack.BufferObj);
	}
	else {
	/* Get/unpack the stipple pattern from user memory */
	_mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);
	}
	}


	/**
	* Called by glPolygonStipple.
	*/
	void GLAPIENTRY
	_mesa_PolygonStipple( const GLubyte *pattern )
	{
	GET_CURRENT_CONTEXT(ctx);
	ASSERT_OUTSIDE_BEGIN_END(ctx);

	if (MESA_VERBOSE&VERBOSE_API)
	_mesa_debug(ctx, "glPolygonStipple\n");

	FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE);

	_mesa_polygon_stipple(ctx, pattern);

	if (ctx->Driver.PolygonStipple)
	ctx->Driver.PolygonStipple(ctx, pattern);
	}


	/**
	* Called by glPolygonStipple.
	*/
	void GLAPIENTRY
	_mesa_GetPolygonStipple( GLubyte *dest )
	{
	GET_CURRENT_CONTEXT(ctx);
	ASSERT_OUTSIDE_BEGIN_END(ctx);

	if (MESA_VERBOSE&VERBOSE_API)
	_mesa_debug(ctx, "glGetPolygonStipple\n");

	/* XXX someday we may put this code into a separate function and call
	* it with ctx->Driver.GetPolygonStipple().
	*/
	if (ctx->Pack.BufferObj->Name) {
	/* Put/pack the stipple pattern into a PBO */
	GLubyte *buf;
	if (!_mesa_validate_pbo_access(2, &ctx->Pack, 32, 32, 1,
	GL_COLOR_INDEX, GL_BITMAP, dest)) {
	_mesa_error(ctx, GL_INVALID_OPERATION,
	"glGetPolygonStipple(bad PBO access)");
	return;
	}
	buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
	GL_WRITE_ONLY_ARB,
	ctx->Pack.BufferObj);
	if (!buf) {
	_mesa_error(ctx, GL_INVALID_OPERATION,
	"glGetPolygonStipple(PBO mapped)");
	return;
	}
	buf = ADD_POINTERS(buf, dest);
	_mesa_pack_polygon_stipple(ctx->PolygonStipple, buf, &ctx->Pack);
	ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
	ctx->Pack.BufferObj);
	}
	else {
	/* Put/pack the stipple pattern into user memory */
	_mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);
	}
	}


	void GLAPIENTRY
	_mesa_PolygonOffset( GLfloat factor, GLfloat units )
	{
	GET_CURRENT_CONTEXT(ctx);
	ASSERT_OUTSIDE_BEGIN_END(ctx);

	if (MESA_VERBOSE&VERBOSE_API)
	_mesa_debug(ctx, "glPolygonOffset %f %f\n", factor, units);

	if (ctx->Polygon.OffsetFactor == factor &&
	ctx->Polygon.OffsetUnits == units)
	return;

	FLUSH_VERTICES(ctx, _NEW_POLYGON);
	ctx->Polygon.OffsetFactor = factor;
	ctx->Polygon.OffsetUnits = units;

	if (ctx->Driver.PolygonOffset)
	ctx->Driver.PolygonOffset( ctx, factor, units );
	}


	void GLAPIENTRY
	_mesa_PolygonOffsetEXT( GLfloat factor, GLfloat bias )
	{
	GET_CURRENT_CONTEXT(ctx);
	/* XXX mult by DepthMaxF here??? */
	_mesa_PolygonOffset(factor, bias * ctx->DrawBuffer->_DepthMaxF );
	}

	#endif


	/**********************************************************************/
	/** \name Initialization */
	/@{/

	/**
	* Initialize the context polygon state.
	*
	* \param ctx GL context.
	*
	* Initializes __GLcontextRec::Polygon and __GLcontextRec::PolygonStipple
	* attribute groups.
	*/
	void _mesa_init_polygon( GLcontext * ctx )
	{
	/* Polygon group */
	ctx->Polygon.CullFlag = GL_FALSE;
	ctx->Polygon.CullFaceMode = GL_BACK;
	ctx->Polygon.FrontFace = GL_CCW;
	ctx->Polygon._FrontBit = 0;
	ctx->Polygon.FrontMode = GL_FILL;
	ctx->Polygon.BackMode = GL_FILL;
	ctx->Polygon.SmoothFlag = GL_FALSE;
	ctx->Polygon.StippleFlag = GL_FALSE;
	ctx->Polygon.OffsetFactor = 0.0F;
	ctx->Polygon.OffsetUnits = 0.0F;
	ctx->Polygon.OffsetPoint = GL_FALSE;
	ctx->Polygon.OffsetLine = GL_FALSE;
	ctx->Polygon.OffsetFill = GL_FALSE;


	/* Polygon Stipple group */
	MEMSET( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );
	}

	/@}/