src/mesa/main/points.c

   1 /* $Id: points.c,v 1.32 2002/04/02 16:15:16 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.1
   6  *
   7  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #ifdef PC_HEADER
  29 #include "all.h"
  30 #else
  31 #include "glheader.h"
  32 #include "context.h"
  33 #include "macros.h"
  34 #include "mmath.h"
  35 #include "points.h"
  36 #include "texstate.h"
  37 #include "mtypes.h"
  38 #endif
  39
  40
  41
  42 void
  43 _mesa_PointSize( GLfloat size )
  44 {
  45    GET_CURRENT_CONTEXT(ctx);
  46    ASSERT_OUTSIDE_BEGIN_END(ctx);
  47
  48    if (size <= 0.0) {
  49       _mesa_error( ctx, GL_INVALID_VALUE, "glPointSize" );
  50       return;
  51    }
  52
  53    if (ctx->Point.Size == size)
  54       return;
  55
  56    FLUSH_VERTICES(ctx, _NEW_POINT);
  57    ctx->Point.Size = size;
  58    ctx->Point._Size = CLAMP(size,
  59                             ctx->Const.MinPointSize,
  60                             ctx->Const.MaxPointSize);
  61
  62    if (ctx->Point._Size == 1.0F)
  63       ctx->_TriangleCaps &= ~DD_POINT_SIZE;
  64    else
  65       ctx->_TriangleCaps |= DD_POINT_SIZE;
  66
  67    if (ctx->Driver.PointSize)
  68       (*ctx->Driver.PointSize)(ctx, size);
  69 }
  70
  71
  72
  73 /*
  74  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
  75  */
  76 void
  77 _mesa_PointParameterfEXT( GLenum pname, GLfloat param)
  78 {
  79    _mesa_PointParameterfvEXT(pname, &param);
  80 }
  81
  82
  83
  84 /*
  85  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
  86  */
  87 void
  88 _mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params)
  89 {
  90    GET_CURRENT_CONTEXT(ctx);
  91    ASSERT_OUTSIDE_BEGIN_END(ctx);
  92
  93    if (!ctx->Extensions.EXT_point_parameters) {
  94       _mesa_error(ctx, GL_INVALID_ENUM, "glPointParameterf[v]{EXT,ARB}(pname)");
  95       return;
  96    }
  97
  98    switch (pname) {
  99       case GL_DISTANCE_ATTENUATION_EXT:
 100          {
 101             const GLboolean tmp = ctx->Point._Attenuated;
 102             if (TEST_EQ_3V(ctx->Point.Params, params))
 103                return;
 104
 105             FLUSH_VERTICES(ctx, _NEW_POINT);
 106             COPY_3V(ctx->Point.Params, params);
 107
 108             /* Update several derived values now.  This likely to be
 109              * more efficient than trying to catch this statechange in
 110              * state.c.
 111              */
 112             ctx->Point._Attenuated = (params[0] != 1.0 ||
 113                                       params[1] != 0.0 ||
 114                                       params[2] != 0.0);
 115
 116             if (tmp != ctx->Point._Attenuated) {
 117                ctx->_TriangleCaps ^= DD_POINT_ATTEN;
 118                ctx->_NeedEyeCoords ^= NEED_EYE_POINT_ATTEN;
 119             }
 120          }
 121          break;
 122       case GL_POINT_SIZE_MIN_EXT:
 123          if (*params < 0.0F) {
 124             _mesa_error( ctx, GL_INVALID_VALUE, "glPointParameterf[v]{EXT,ARB}(param)" );
 125             return;
 126          }
 127          if (ctx->Point.MinSize == *params)
 128             return;
 129          FLUSH_VERTICES(ctx, _NEW_POINT);
 130          ctx->Point.MinSize = *params;
 131          break;
 132       case GL_POINT_SIZE_MAX_EXT:
 133          if (*params < 0.0F) {
 134             _mesa_error( ctx, GL_INVALID_VALUE, "glPointParameterf[v]{EXT,ARB}(param)" );
 135             return;
 136          }
 137          if (ctx->Point.MaxSize == *params)
 138             return;
 139          FLUSH_VERTICES(ctx, _NEW_POINT);
 140          ctx->Point.MaxSize = *params;
 141          break;
 142       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 143          if (*params < 0.0F) {
 144             _mesa_error( ctx, GL_INVALID_VALUE, "glPointParameterf[v]{EXT,ARB}(param)" );
 145             return;
 146          }
 147          if (ctx->Point.Threshold == *params)
 148             return;
 149          FLUSH_VERTICES(ctx, _NEW_POINT);
 150          ctx->Point.Threshold = *params;
 151          break;
 152       default:
 153          _mesa_error( ctx, GL_INVALID_ENUM, "glPointParameterf[v]{EXT,ARB}(pname)" );
 154          return;
 155    }
 156
 157    if (ctx->Driver.PointParameterfv)
 158       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 159 }