src/mesa/main/points.c

   1 /* $Id: points.c,v 1.31 2001/03/29 21:16:25 keithw Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  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 void
  74 _mesa_PointParameterfEXT( GLenum pname, GLfloat param)
  75 {
  76    _mesa_PointParameterfvEXT(pname, &param);
  77 }
  78
  79
  80 void
  81 _mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params)
  82 {
  83    GET_CURRENT_CONTEXT(ctx);
  84    ASSERT_OUTSIDE_BEGIN_END(ctx);
  85
  86    switch (pname) {
  87       case GL_DISTANCE_ATTENUATION_EXT:
  88          {
  89             const GLboolean tmp = ctx->Point._Attenuated;
  90             if (TEST_EQ_3V(ctx->Point.Params, params))
  91                return;
  92
  93             FLUSH_VERTICES(ctx, _NEW_POINT);
  94             COPY_3V(ctx->Point.Params, params);
  95
  96             /* Update several derived values now.  This likely to be
  97              * more efficient than trying to catch this statechange in
  98              * state.c.
  99              */
 100             ctx->Point._Attenuated = (params[0] != 1.0 ||
 101                                       params[1] != 0.0 ||
 102                                       params[2] != 0.0);
 103
 104             if (tmp != ctx->Point._Attenuated) {
 105                ctx->_TriangleCaps ^= DD_POINT_ATTEN;
 106                ctx->_NeedEyeCoords ^= NEED_EYE_POINT_ATTEN;
 107             }
 108          }
 109          break;
 110       case GL_POINT_SIZE_MIN_EXT:
 111          if (*params < 0.0F) {
 112             _mesa_error( ctx, GL_INVALID_VALUE, "glPointParameterfvEXT" );
 113             return;
 114          }
 115          if (ctx->Point.MinSize == *params)
 116             return;
 117          FLUSH_VERTICES(ctx, _NEW_POINT);
 118          ctx->Point.MinSize = *params;
 119          break;
 120       case GL_POINT_SIZE_MAX_EXT:
 121          if (*params < 0.0F) {
 122             _mesa_error( ctx, GL_INVALID_VALUE, "glPointParameterfvEXT" );
 123             return;
 124          }
 125          if (ctx->Point.MaxSize == *params)
 126             return;
 127          FLUSH_VERTICES(ctx, _NEW_POINT);
 128          ctx->Point.MaxSize = *params;
 129          break;
 130       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 131          if (*params < 0.0F) {
 132             _mesa_error( ctx, GL_INVALID_VALUE, "glPointParameterfvEXT" );
 133             return;
 134          }
 135          if (ctx->Point.Threshold == *params)
 136             return;
 137          FLUSH_VERTICES(ctx, _NEW_POINT);
 138          ctx->Point.Threshold = *params;
 139          break;
 140       default:
 141          _mesa_error( ctx, GL_INVALID_ENUM, "glPointParameterfvEXT" );
 142          return;
 143    }
 144
 145    if (ctx->Driver.PointParameterfv)
 146       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 147 }