src/mesa/main/points.c

   1 /* $Id: points.c,v 1.34 2002/10/24 23:57:21 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 #include "glheader.h"
  29 #include "context.h"
  30 #include "macros.h"
  31 #include "mmath.h"
  32 #include "points.h"
  33 #include "texstate.h"
  34 #include "mtypes.h"
  35
  36
  37
  38 void
  39 _mesa_PointSize( GLfloat size )
  40 {
  41    GET_CURRENT_CONTEXT(ctx);
  42    ASSERT_OUTSIDE_BEGIN_END(ctx);
  43
  44    if (size <= 0.0) {
  45       _mesa_error( ctx, GL_INVALID_VALUE, "glPointSize" );
  46       return;
  47    }
  48
  49    if (ctx->Point.Size == size)
  50       return;
  51
  52    FLUSH_VERTICES(ctx, _NEW_POINT);
  53    ctx->Point.Size = size;
  54    ctx->Point._Size = CLAMP(size,
  55                             ctx->Const.MinPointSize,
  56                             ctx->Const.MaxPointSize);
  57
  58    if (ctx->Point._Size == 1.0F)
  59       ctx->_TriangleCaps &= ~DD_POINT_SIZE;
  60    else
  61       ctx->_TriangleCaps |= DD_POINT_SIZE;
  62
  63    if (ctx->Driver.PointSize)
  64       (*ctx->Driver.PointSize)(ctx, size);
  65 }
  66
  67
  68
  69 /*
  70  * Added by GL_NV_point_sprite
  71  */
  72 void
  73 _mesa_PointParameteriNV( GLenum pname, GLint param )
  74 {
  75    const GLfloat value = (GLfloat) param;
  76    _mesa_PointParameterfvEXT(pname, &value);
  77 }
  78
  79
  80 /*
  81  * Added by GL_NV_point_sprite
  82  */
  83 void
  84 _mesa_PointParameterivNV( GLenum pname, const GLint *params )
  85 {
  86    const GLfloat value = (GLfloat) params[0];
  87    _mesa_PointParameterfvEXT(pname, &value);
  88 }
  89
  90
  91
  92 /*
  93  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
  94  */
  95 void
  96 _mesa_PointParameterfEXT( GLenum pname, GLfloat param)
  97 {
  98    _mesa_PointParameterfvEXT(pname, &param);
  99 }
 100
 101
 102
 103 /*
 104  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
 105  */
 106 void
 107 _mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params)
 108 {
 109    GET_CURRENT_CONTEXT(ctx);
 110    ASSERT_OUTSIDE_BEGIN_END(ctx);
 111
 112    switch (pname) {
 113       case GL_DISTANCE_ATTENUATION_EXT:
 114          if (ctx->Extensions.EXT_point_parameters) {
 115             const GLboolean tmp = ctx->Point._Attenuated;
 116             if (TEST_EQ_3V(ctx->Point.Params, params))
 117                return;
 118
 119             FLUSH_VERTICES(ctx, _NEW_POINT);
 120             COPY_3V(ctx->Point.Params, params);
 121
 122             /* Update several derived values now.  This likely to be
 123              * more efficient than trying to catch this statechange in
 124              * state.c.
 125              */
 126             ctx->Point._Attenuated = (params[0] != 1.0 ||
 127                                       params[1] != 0.0 ||
 128                                       params[2] != 0.0);
 129
 130             if (tmp != ctx->Point._Attenuated) {
 131                ctx->_TriangleCaps ^= DD_POINT_ATTEN;
 132                ctx->_NeedEyeCoords ^= NEED_EYE_POINT_ATTEN;
 133             }
 134          }
 135          else {
 136             _mesa_error(ctx, GL_INVALID_ENUM,
 137                         "glPointParameterf[v]{EXT,ARB}(pname)");
 138             return;
 139          }
 140          break;
 141       case GL_POINT_SIZE_MIN_EXT:
 142          if (ctx->Extensions.EXT_point_parameters) {
 143             if (params[0] < 0.0F) {
 144                _mesa_error( ctx, GL_INVALID_VALUE,
 145                             "glPointParameterf[v]{EXT,ARB}(param)" );
 146                return;
 147             }
 148             if (ctx->Point.MinSize == params[0])
 149                return;
 150             FLUSH_VERTICES(ctx, _NEW_POINT);
 151             ctx->Point.MinSize = params[0];
 152          }
 153          else {
 154             _mesa_error(ctx, GL_INVALID_ENUM,
 155                         "glPointParameterf[v]{EXT,ARB}(pname)");
 156             return;
 157          }
 158          break;
 159       case GL_POINT_SIZE_MAX_EXT:
 160          if (ctx->Extensions.EXT_point_parameters) {
 161             if (params[0] < 0.0F) {
 162                _mesa_error( ctx, GL_INVALID_VALUE,
 163                             "glPointParameterf[v]{EXT,ARB}(param)" );
 164                return;
 165             }
 166             if (ctx->Point.MaxSize == params[0])
 167                return;
 168             FLUSH_VERTICES(ctx, _NEW_POINT);
 169             ctx->Point.MaxSize = params[0];
 170          }
 171          else {
 172             _mesa_error(ctx, GL_INVALID_ENUM,
 173                         "glPointParameterf[v]{EXT,ARB}(pname)");
 174             return;
 175          }
 176          break;
 177       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 178          if (ctx->Extensions.EXT_point_parameters) {
 179             if (params[0] < 0.0F) {
 180                _mesa_error( ctx, GL_INVALID_VALUE,
 181                             "glPointParameterf[v]{EXT,ARB}(param)" );
 182                return;
 183             }
 184             if (ctx->Point.Threshold == params[0])
 185                return;
 186             FLUSH_VERTICES(ctx, _NEW_POINT);
 187             ctx->Point.Threshold = params[0];
 188          }
 189          else {
 190             _mesa_error(ctx, GL_INVALID_ENUM,
 191                         "glPointParameterf[v]{EXT,ARB}(pname)");
 192             return;
 193          }
 194          break;
 195       case GL_POINT_SPRITE_R_MODE_NV:
 196          if (ctx->Extensions.NV_point_sprite) {
 197             GLenum value = (GLenum) params[0];
 198             if (value != GL_ZERO && value != GL_S && value != GL_R) {
 199                _mesa_error(ctx, GL_INVALID_VALUE,
 200                            "glPointParameterf[v]{EXT,ARB}(param)");
 201                return;
 202             }
 203             if (ctx->Point.SpriteRMode == value)
 204                return;
 205             FLUSH_VERTICES(ctx, _NEW_POINT);
 206             ctx->Point.SpriteRMode = value;
 207          }
 208          else {
 209             _mesa_error(ctx, GL_INVALID_ENUM,
 210                         "glPointParameterf[v]{EXT,ARB}(pname)");
 211             return;
 212          }
 213          break;
 214       default:
 215          _mesa_error( ctx, GL_INVALID_ENUM,
 216                       "glPointParameterf[v]{EXT,ARB}(pname)" );
 217          return;
 218    }
 219
 220    if (ctx->Driver.PointParameterfv)
 221       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 222 }