| /** |
| * \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; |
| } |