src/mesa/main/points.c

   1 /* $Id: points.c,v 1.27 2001/01/09 00:02:55 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.4
   6  *
   7  * Copyright (C) 1999-2000  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 "feedback.h"
  34 #include "macros.h"
  35 #include "mmath.h"
  36 #include "points.h"
  37 #include "texstate.h"
  38 #include "mtypes.h"
  39 #endif
  40
  41
  42
  43 void
  44 _mesa_PointSize( GLfloat size )
  45 {
  46    GET_CURRENT_CONTEXT(ctx);
  47    ASSERT_OUTSIDE_BEGIN_END(ctx);
  48
  49    if (size <= 0.0) {
  50       gl_error( ctx, GL_INVALID_VALUE, "glPointSize" );
  51       return;
  52    }
  53
  54    if (ctx->Point.Size == size)
  55       return;
  56
  57    FLUSH_VERTICES(ctx, _NEW_POINT);
  58    ctx->Point.Size = size;
  59    ctx->Point._Size = CLAMP(size,
  60                             ctx->Const.MinPointSize,
  61                             ctx->Const.MaxPointSize);
  62
  63    if (ctx->Point._Size == 1.0F)
  64       ctx->_TriangleCaps &= ~DD_POINT_SIZE;
  65    else
  66       ctx->_TriangleCaps |= DD_POINT_SIZE;
  67
  68    if (ctx->Driver.PointSize)
  69       (*ctx->Driver.PointSize)(ctx, size);
  70 }
  71
  72
  73
  74 void
  75 _mesa_PointParameterfEXT( GLenum pname, GLfloat param)
  76 {
  77    _mesa_PointParameterfvEXT(pname, &param);
  78 }
  79
  80
  81 void
  82 _mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params)
  83 {
  84    GET_CURRENT_CONTEXT(ctx);
  85    ASSERT_OUTSIDE_BEGIN_END(ctx);
  86
  87    switch (pname) {
  88       case GL_DISTANCE_ATTENUATION_EXT:
  89          {
  90             const GLboolean tmp = ctx->Point._Attenuated;
  91             if (TEST_EQ_3V(ctx->Point.Params, params))
  92                return;
  93
  94             FLUSH_VERTICES(ctx, _NEW_POINT);
  95             COPY_3V(ctx->Point.Params, params);
  96
  97             /* Update several derived values now.  This likely to be
  98              * more efficient than trying to catch this statechange in
  99              * state.c.
 100              */
 101             ctx->Point._Attenuated = (params[0] != 1.0 ||
 102                                       params[1] != 0.0 ||
 103                                       params[2] != 0.0);
 104
 105             if (tmp != ctx->Point._Attenuated) {
 106                ctx->_Enabled ^= ENABLE_POINT_ATTEN;
 107                ctx->_TriangleCaps ^= DD_POINT_ATTEN;
 108                ctx->_NeedEyeCoords ^= NEED_EYE_POINT_ATTEN;
 109             }
 110          }
 111          break;
 112       case GL_POINT_SIZE_MIN_EXT:
 113          if (*params < 0.0F) {
 114             gl_error( ctx, GL_INVALID_VALUE, "glPointParameterfvEXT" );
 115             return;
 116          }
 117          if (ctx->Point.MinSize == *params)
 118             return;
 119          FLUSH_VERTICES(ctx, _NEW_POINT);
 120          ctx->Point.MinSize = *params;
 121          break;
 122       case GL_POINT_SIZE_MAX_EXT:
 123          if (*params < 0.0F) {
 124             gl_error( ctx, GL_INVALID_VALUE, "glPointParameterfvEXT" );
 125             return;
 126          }
 127          if (ctx->Point.MaxSize == *params)
 128             return;
 129          FLUSH_VERTICES(ctx, _NEW_POINT);
 130          ctx->Point.MaxSize = *params;
 131          break;
 132       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 133          if (*params < 0.0F) {
 134             gl_error( ctx, GL_INVALID_VALUE, "glPointParameterfvEXT" );
 135             return;
 136          }
 137          if (ctx->Point.Threshold == *params)
 138             return;
 139          FLUSH_VERTICES(ctx, _NEW_POINT);
 140          ctx->Point.Threshold = *params;
 141          break;
 142       default:
 143          gl_error( ctx, GL_INVALID_ENUM, "glPointParameterfvEXT" );
 144          return;
 145    }
 146
 147    if (ctx->Driver.PointParameterfv)
 148       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 149 }
 150