src/mesa/main/points.c

   1 /* $Id: points.c,v 1.33 2002/05/27 17:04:53 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  * Added by GL_NV_point_sprite
  75  */
  76 void
  77 _mesa_PointParameteriNV( GLenum pname, GLint param )
  78 {
  79    const GLfloat value = (GLfloat) param;
  80    _mesa_PointParameterfvEXT(pname, &value);
  81 }
  82
  83
  84 /*
  85  * Added by GL_NV_point_sprite
  86  */
  87 void
  88 _mesa_PointParameterivNV( GLenum pname, const GLint *params )
  89 {
  90    const GLfloat value = (GLfloat) params[0];
  91    _mesa_PointParameterfvEXT(pname, &value);
  92 }
  93
  94
  95
  96 /*
  97  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
  98  */
  99 void
 100 _mesa_PointParameterfEXT( GLenum pname, GLfloat param)
 101 {
 102    _mesa_PointParameterfvEXT(pname, &param);
 103 }
 104
 105
 106
 107 /*
 108  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
 109  */
 110 void
 111 _mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params)
 112 {
 113    GET_CURRENT_CONTEXT(ctx);
 114    ASSERT_OUTSIDE_BEGIN_END(ctx);
 115
 116    switch (pname) {
 117       case GL_DISTANCE_ATTENUATION_EXT:
 118          if (ctx->Extensions.EXT_point_parameters) {
 119             const GLboolean tmp = ctx->Point._Attenuated;
 120             if (TEST_EQ_3V(ctx->Point.Params, params))
 121                return;
 122
 123             FLUSH_VERTICES(ctx, _NEW_POINT);
 124             COPY_3V(ctx->Point.Params, params);
 125
 126             /* Update several derived values now.  This likely to be
 127              * more efficient than trying to catch this statechange in
 128              * state.c.
 129              */
 130             ctx->Point._Attenuated = (params[0] != 1.0 ||
 131                                       params[1] != 0.0 ||
 132                                       params[2] != 0.0);
 133
 134             if (tmp != ctx->Point._Attenuated) {
 135                ctx->_TriangleCaps ^= DD_POINT_ATTEN;
 136                ctx->_NeedEyeCoords ^= NEED_EYE_POINT_ATTEN;
 137             }
 138          }
 139          else {
 140             _mesa_error(ctx, GL_INVALID_ENUM,
 141                         "glPointParameterf[v]{EXT,ARB}(pname)");
 142             return;
 143          }
 144          break;
 145       case GL_POINT_SIZE_MIN_EXT:
 146          if (ctx->Extensions.EXT_point_parameters) {
 147             if (params[0] < 0.0F) {
 148                _mesa_error( ctx, GL_INVALID_VALUE,
 149                             "glPointParameterf[v]{EXT,ARB}(param)" );
 150                return;
 151             }
 152             if (ctx->Point.MinSize == params[0])
 153                return;
 154             FLUSH_VERTICES(ctx, _NEW_POINT);
 155             ctx->Point.MinSize = params[0];
 156          }
 157          else {
 158             _mesa_error(ctx, GL_INVALID_ENUM,
 159                         "glPointParameterf[v]{EXT,ARB}(pname)");
 160             return;
 161          }
 162          break;
 163       case GL_POINT_SIZE_MAX_EXT:
 164          if (ctx->Extensions.EXT_point_parameters) {
 165             if (params[0] < 0.0F) {
 166                _mesa_error( ctx, GL_INVALID_VALUE,
 167                             "glPointParameterf[v]{EXT,ARB}(param)" );
 168                return;
 169             }
 170             if (ctx->Point.MaxSize == params[0])
 171                return;
 172             FLUSH_VERTICES(ctx, _NEW_POINT);
 173             ctx->Point.MaxSize = params[0];
 174          }
 175          else {
 176             _mesa_error(ctx, GL_INVALID_ENUM,
 177                         "glPointParameterf[v]{EXT,ARB}(pname)");
 178             return;
 179          }
 180          break;
 181       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 182          if (ctx->Extensions.EXT_point_parameters) {
 183             if (params[0] < 0.0F) {
 184                _mesa_error( ctx, GL_INVALID_VALUE,
 185                             "glPointParameterf[v]{EXT,ARB}(param)" );
 186                return;
 187             }
 188             if (ctx->Point.Threshold == params[0])
 189                return;
 190             FLUSH_VERTICES(ctx, _NEW_POINT);
 191             ctx->Point.Threshold = params[0];
 192          }
 193          else {
 194             _mesa_error(ctx, GL_INVALID_ENUM,
 195                         "glPointParameterf[v]{EXT,ARB}(pname)");
 196             return;
 197          }
 198          break;
 199       case GL_POINT_SPRITE_R_MODE_NV:
 200          if (ctx->Extensions.NV_point_sprite) {
 201             GLenum value = (GLenum) params[0];
 202             if (value != GL_ZERO && value != GL_S && value != GL_R) {
 203                _mesa_error(ctx, GL_INVALID_VALUE,
 204                            "glPointParameterf[v]{EXT,ARB}(param)");
 205                return;
 206             }
 207             if (ctx->Point.SpriteRMode == value)
 208                return;
 209             FLUSH_VERTICES(ctx, _NEW_POINT);
 210             ctx->Point.SpriteRMode = value;
 211          }
 212          else {
 213             _mesa_error(ctx, GL_INVALID_ENUM,
 214                         "glPointParameterf[v]{EXT,ARB}(pname)");
 215             return;
 216          }
 217          break;
 218       default:
 219          _mesa_error( ctx, GL_INVALID_ENUM,
 220                       "glPointParameterf[v]{EXT,ARB}(pname)" );
 221          return;
 222    }
 223
 224    if (ctx->Driver.PointParameterfv)
 225       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 226 }