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/**
* \file lines.c
* Line operations.
*/
/*
* Mesa 3-D graphics library
* Version: 5.1
*
* 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.
*/
#include "glheader.h"
#include "context.h"
#include "depth.h"
#include "lines.h"
#include "macros.h"
#include "texstate.h"
#include "mtypes.h"
/**
* Set the line width.
*
* \param width line width in pixels.
*
* \sa glLineWidth().
*
* Verifies the parameter and updates gl_line_attrib::Width. On a change,
* flushes the vertices, updates the clamped line width and marks the
* DD_LINE_WIDTH flag in __GLcontextRec::_TriangleCaps for the drivers if the
* width is different from one. Notifies the driver via the
* dd_function_table::LineWidth callback.
*/
void GLAPIENTRY
_mesa_LineWidth( GLfloat width )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (width<=0.0) {
_mesa_error( ctx, GL_INVALID_VALUE, "glLineWidth" );
return;
}
if (ctx->Line.Width == width)
return;
FLUSH_VERTICES(ctx, _NEW_LINE);
ctx->Line.Width = width;
ctx->Line._Width = CLAMP(width,
ctx->Const.MinLineWidth,
ctx->Const.MaxLineWidth);
if (width != 1.0)
ctx->_TriangleCaps |= DD_LINE_WIDTH;
else
ctx->_TriangleCaps &= ~DD_LINE_WIDTH;
if (ctx->Driver.LineWidth)
(*ctx->Driver.LineWidth)(ctx, width);
}
/**
* Set the line stipple pattern.
*
* \param factor pattern scale factor.
* \param pattern bit pattern.
*
* \sa glLineStipple().
*
* Updates gl_line_attrib::StippleFactor and gl_line_attrib::StipplePattern. On
* change flushes the vertices and notifies the driver via
* the dd_function_table::LineStipple callback.
*/
void GLAPIENTRY
_mesa_LineStipple( GLint factor, GLushort pattern )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END(ctx);
factor = CLAMP( factor, 1, 256 );
if (ctx->Line.StippleFactor == factor &&
ctx->Line.StipplePattern == pattern)
return;
FLUSH_VERTICES(ctx, _NEW_LINE);
ctx->Line.StippleFactor = factor;
ctx->Line.StipplePattern = pattern;
if (ctx->Driver.LineStipple)
ctx->Driver.LineStipple( ctx, factor, pattern );
}
/**
* Initialize the context line state.
*
* \param ctx GL context.
*
* Initializes __GLcontextRec::Line and line related constants in
* __GLcontextRec::Const.
*/
void GLAPIENTRY _mesa_init_line( GLcontext * ctx )
{
/* Line group */
ctx->Line.SmoothFlag = GL_FALSE;
ctx->Line.StippleFlag = GL_FALSE;
ctx->Line.Width = 1.0;
ctx->Line._Width = 1.0;
ctx->Line.StipplePattern = 0xffff;
ctx->Line.StippleFactor = 1;
}
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