src/mesa/main/points.c

   1 /* $Id: points.c,v 1.21 2000/11/13 20:02:56 keithw 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 "types.h"
  39 #include "vb.h"
  40 #endif
  41
  42
  43
  44 void
  45 _mesa_PointSize( GLfloat size )
  46 {
  47    GET_CURRENT_CONTEXT(ctx);
  48    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPointSize");
  49
  50    if (size <= 0.0) {
  51       gl_error( ctx, GL_INVALID_VALUE, "glPointSize" );
  52       return;
  53    }
  54
  55    if (ctx->Point.UserSize != size) {
  56       ctx->Point.UserSize = size;
  57       ctx->Point.Size = CLAMP(size, ctx->Const.MinPointSize, ctx->Const.MaxPointSize);
  58       ctx->_TriangleCaps &= ~DD_POINT_SIZE;
  59       if (size != 1.0)
  60          ctx->_TriangleCaps |= DD_POINT_SIZE;
  61       ctx->NewState |= _NEW_POINT;
  62    }
  63 }
  64
  65
  66
  67 void
  68 _mesa_PointParameterfEXT( GLenum pname, GLfloat param)
  69 {
  70    _mesa_PointParameterfvEXT(pname, &param);
  71 }
  72
  73
  74 void
  75 _mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params)
  76 {
  77    GET_CURRENT_CONTEXT(ctx);
  78    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPointParameterfvEXT");
  79
  80    switch (pname) {
  81       case GL_DISTANCE_ATTENUATION_EXT:
  82          {
  83             const GLboolean tmp = ctx->Point._Attenuated;
  84             COPY_3V(ctx->Point.Params, params);
  85             ctx->Point._Attenuated = (params[0] != 1.0 ||
  86                                       params[1] != 0.0 ||
  87                                       params[2] != 0.0);
  88
  89             if (tmp != ctx->Point._Attenuated) {
  90                ctx->_Enabled ^= ENABLE_POINT_ATTEN;
  91                ctx->_TriangleCaps ^= DD_POINT_ATTEN;
  92                ctx->_NeedEyeCoords ^= NEED_EYE_POINT_ATTEN;
  93             }
  94          }
  95          break;
  96       case GL_POINT_SIZE_MIN_EXT:
  97          if (*params < 0.0F) {
  98             gl_error( ctx, GL_INVALID_VALUE, "glPointParameterfvEXT" );
  99             return;
 100          }
 101          ctx->Point.MinSize = *params;
 102          break;
 103       case GL_POINT_SIZE_MAX_EXT:
 104          if (*params < 0.0F) {
 105             gl_error( ctx, GL_INVALID_VALUE, "glPointParameterfvEXT" );
 106             return;
 107          }
 108          ctx->Point.MaxSize = *params;
 109          break;
 110       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 111          if (*params < 0.0F) {
 112             gl_error( ctx, GL_INVALID_VALUE, "glPointParameterfvEXT" );
 113             return;
 114          }
 115          ctx->Point.Threshold = *params;
 116          break;
 117       default:
 118          gl_error( ctx, GL_INVALID_ENUM, "glPointParameterfvEXT" );
 119          return;
 120    }
 121
 122    ctx->NewState |= _NEW_POINT;
 123 }
 124