lines.c revision 3fe2af23ef323b9b25b54e171aa29c7004fe05fd
1/** 2 * \file lines.c 3 * Line operations. 4 */ 5 6/* 7 * Mesa 3-D graphics library 8 * Version: 5.1 9 * 10 * Copyright (C) 1999-2003 Brian Paul All Rights Reserved. 11 * 12 * Permission is hereby granted, free of charge, to any person obtaining a 13 * copy of this software and associated documentation files (the "Software"), 14 * to deal in the Software without restriction, including without limitation 15 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 16 * and/or sell copies of the Software, and to permit persons to whom the 17 * Software is furnished to do so, subject to the following conditions: 18 * 19 * The above copyright notice and this permission notice shall be included 20 * in all copies or substantial portions of the Software. 21 * 22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 23 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 25 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN 26 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 27 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 28 */ 29 30 31#include "glheader.h" 32#include "context.h" 33#include "depth.h" 34#include "lines.h" 35#include "macros.h" 36#include "texstate.h" 37#include "mtypes.h" 38 39 40/** 41 * Set the line width. 42 * 43 * \param width line width in pixels. 44 * 45 * \sa glLineWidth(). 46 * 47 * Verifies the parameter and updates gl_line_attrib::Width. On a change, 48 * flushes the vertices, updates the clamped line width and marks the 49 * DD_LINE_WIDTH flag in __GLcontextRec::_TriangleCaps for the drivers if the 50 * width is different from one. Notifies the driver via the 51 * dd_function_table::LineWidth callback. 52 */ 53void GLAPIENTRY 54_mesa_LineWidth( GLfloat width ) 55{ 56 GET_CURRENT_CONTEXT(ctx); 57 ASSERT_OUTSIDE_BEGIN_END(ctx); 58 59 if (width<=0.0) { 60 _mesa_error( ctx, GL_INVALID_VALUE, "glLineWidth" ); 61 return; 62 } 63 64 if (ctx->Line.Width == width) 65 return; 66 67 FLUSH_VERTICES(ctx, _NEW_LINE); 68 ctx->Line.Width = width; 69 ctx->Line._Width = CLAMP(width, 70 ctx->Const.MinLineWidth, 71 ctx->Const.MaxLineWidth); 72 73 74 if (width != 1.0) 75 ctx->_TriangleCaps |= DD_LINE_WIDTH; 76 else 77 ctx->_TriangleCaps &= ~DD_LINE_WIDTH; 78 79 if (ctx->Driver.LineWidth) 80 (*ctx->Driver.LineWidth)(ctx, width); 81} 82 83 84/** 85 * Set the line stipple pattern. 86 * 87 * \param factor pattern scale factor. 88 * \param pattern bit pattern. 89 * 90 * \sa glLineStipple(). 91 * 92 * Updates gl_line_attrib::StippleFactor and gl_line_attrib::StipplePattern. On 93 * change flushes the vertices and notifies the driver via 94 * the dd_function_table::LineStipple callback. 95 */ 96void GLAPIENTRY 97_mesa_LineStipple( GLint factor, GLushort pattern ) 98{ 99 GET_CURRENT_CONTEXT(ctx); 100 ASSERT_OUTSIDE_BEGIN_END(ctx); 101 102 factor = CLAMP( factor, 1, 256 ); 103 104 if (ctx->Line.StippleFactor == factor && 105 ctx->Line.StipplePattern == pattern) 106 return; 107 108 FLUSH_VERTICES(ctx, _NEW_LINE); 109 ctx->Line.StippleFactor = factor; 110 ctx->Line.StipplePattern = pattern; 111 112 if (ctx->Driver.LineStipple) 113 ctx->Driver.LineStipple( ctx, factor, pattern ); 114} 115 116 117/** 118 * Initialize the context line state. 119 * 120 * \param ctx GL context. 121 * 122 * Initializes __GLcontextRec::Line and line related constants in 123 * __GLcontextRec::Const. 124 */ 125void GLAPIENTRY _mesa_init_line( GLcontext * ctx ) 126{ 127 /* Line group */ 128 ctx->Line.SmoothFlag = GL_FALSE; 129 ctx->Line.StippleFlag = GL_FALSE; 130 ctx->Line.Width = 1.0; 131 ctx->Line._Width = 1.0; 132 ctx->Line.StipplePattern = 0xffff; 133 ctx->Line.StippleFactor = 1; 134} 135