src/mesa/main/points.c

   1 /**
   2  * \file points.c
   3  * Point operations.
   4  */
   5
   6 /*
   7  * Mesa 3-D graphics library
   8  * Version:  6.5.1
   9  *
  10  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a
  13  * copy of this software and associated documentation files (the "Software"),
  14  * to deal in the Software without restriction, including without limitation
  15  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  16  * and/or sell copies of the Software, and to permit persons to whom the
  17  * Software is furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included
  20  * in all copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  23  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  25  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  26  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  27  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28  */
  29
  30
  31 #include "glheader.h"
  32 #include "context.h"
  33 #include "macros.h"
  34 #include "points.h"
  35 #include "texstate.h"
  36 #include "mtypes.h"
  37
  38
  39 /**
  40  * Set current point size.
  41  * \param size  point diameter in pixels
  42  * \sa glPointSize().
  43  */
  44 void GLAPIENTRY
  45 _mesa_PointSize( GLfloat size )
  46 {
  47    GET_CURRENT_CONTEXT(ctx);
  48    ASSERT_OUTSIDE_BEGIN_END(ctx);
  49
  50    if (size <= 0.0) {
  51       _mesa_error( ctx, GL_INVALID_VALUE, "glPointSize" );
  52       return;
  53    }
  54
  55    if (ctx->Point.Size == size)
  56       return;
  57
  58    FLUSH_VERTICES(ctx, _NEW_POINT);
  59    ctx->Point.Size = size;
  60
  61    if (ctx->Driver.PointSize)
  62       ctx->Driver.PointSize(ctx, size);
  63 }
  64
  65
  66 #if _HAVE_FULL_GL
  67
  68 /*
  69  * Added by GL_NV_point_sprite
  70  */
  71 void GLAPIENTRY
  72 _mesa_PointParameteriNV( GLenum pname, GLint param )
  73 {
  74    const GLfloat value = (GLfloat) param;
  75    _mesa_PointParameterfvEXT(pname, &value);
  76 }
  77
  78
  79 /*
  80  * Added by GL_NV_point_sprite
  81  */
  82 void GLAPIENTRY
  83 _mesa_PointParameterivNV( GLenum pname, const GLint *params )
  84 {
  85    const GLfloat value = (GLfloat) params[0];
  86    _mesa_PointParameterfvEXT(pname, &value);
  87 }
  88
  89
  90
  91 /*
  92  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
  93  */
  94 void GLAPIENTRY
  95 _mesa_PointParameterfEXT( GLenum pname, GLfloat param)
  96 {
  97    _mesa_PointParameterfvEXT(pname, &param);
  98 }
  99
 100
 101
 102 /*
 103  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
 104  */
 105 void GLAPIENTRY
 106 _mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params)
 107 {
 108    GET_CURRENT_CONTEXT(ctx);
 109    ASSERT_OUTSIDE_BEGIN_END(ctx);
 110
 111    switch (pname) {
 112       case GL_DISTANCE_ATTENUATION_EXT:
 113          if (ctx->Extensions.EXT_point_parameters) {
 114             if (TEST_EQ_3V(ctx->Point.Params, params))
 115                return;
 116             FLUSH_VERTICES(ctx, _NEW_POINT);
 117             COPY_3V(ctx->Point.Params, params);
 118          }
 119          else {
 120             _mesa_error(ctx, GL_INVALID_ENUM,
 121                         "glPointParameterf[v]{EXT,ARB}(pname)");
 122             return;
 123          }
 124          break;
 125       case GL_POINT_SIZE_MIN_EXT:
 126          if (ctx->Extensions.EXT_point_parameters) {
 127             if (params[0] < 0.0F) {
 128                _mesa_error( ctx, GL_INVALID_VALUE,
 129                             "glPointParameterf[v]{EXT,ARB}(param)" );
 130                return;
 131             }
 132             if (ctx->Point.MinSize == params[0])
 133                return;
 134             FLUSH_VERTICES(ctx, _NEW_POINT);
 135             ctx->Point.MinSize = params[0];
 136          }
 137          else {
 138             _mesa_error(ctx, GL_INVALID_ENUM,
 139                         "glPointParameterf[v]{EXT,ARB}(pname)");
 140             return;
 141          }
 142          break;
 143       case GL_POINT_SIZE_MAX_EXT:
 144          if (ctx->Extensions.EXT_point_parameters) {
 145             if (params[0] < 0.0F) {
 146                _mesa_error( ctx, GL_INVALID_VALUE,
 147                             "glPointParameterf[v]{EXT,ARB}(param)" );
 148                return;
 149             }
 150             if (ctx->Point.MaxSize == params[0])
 151                return;
 152             FLUSH_VERTICES(ctx, _NEW_POINT);
 153             ctx->Point.MaxSize = params[0];
 154          }
 155          else {
 156             _mesa_error(ctx, GL_INVALID_ENUM,
 157                         "glPointParameterf[v]{EXT,ARB}(pname)");
 158             return;
 159          }
 160          break;
 161       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 162          if (ctx->Extensions.EXT_point_parameters) {
 163             if (params[0] < 0.0F) {
 164                _mesa_error( ctx, GL_INVALID_VALUE,
 165                             "glPointParameterf[v]{EXT,ARB}(param)" );
 166                return;
 167             }
 168             if (ctx->Point.Threshold == params[0])
 169                return;
 170             FLUSH_VERTICES(ctx, _NEW_POINT);
 171             ctx->Point.Threshold = params[0];
 172          }
 173          else {
 174             _mesa_error(ctx, GL_INVALID_ENUM,
 175                         "glPointParameterf[v]{EXT,ARB}(pname)");
 176             return;
 177          }
 178          break;
 179       case GL_POINT_SPRITE_R_MODE_NV:
 180          /* This is one area where ARB_point_sprite and NV_point_sprite
 181           * differ.  In ARB_point_sprite the POINT_SPRITE_R_MODE is
 182           * always ZERO.  NV_point_sprite adds the S and R modes.
 183           */
 184          if (ctx->Extensions.NV_point_sprite) {
 185             GLenum value = (GLenum) params[0];
 186             if (value != GL_ZERO && value != GL_S && value != GL_R) {
 187                _mesa_error(ctx, GL_INVALID_VALUE,
 188                            "glPointParameterf[v]{EXT,ARB}(param)");
 189                return;
 190             }
 191             if (ctx->Point.SpriteRMode == value)
 192                return;
 193             FLUSH_VERTICES(ctx, _NEW_POINT);
 194             ctx->Point.SpriteRMode = value;
 195          }
 196          else {
 197             _mesa_error(ctx, GL_INVALID_ENUM,
 198                         "glPointParameterf[v]{EXT,ARB}(pname)");
 199             return;
 200          }
 201          break;
 202       case GL_POINT_SPRITE_COORD_ORIGIN:
 203          if (ctx->Extensions.ARB_point_sprite) {
 204             GLenum value = (GLenum) params[0];
 205             if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) {
 206                _mesa_error(ctx, GL_INVALID_VALUE,
 207                            "glPointParameterf[v]{EXT,ARB}(param)");
 208                return;
 209             }
 210             if (ctx->Point.SpriteOrigin == value)
 211                return;
 212             FLUSH_VERTICES(ctx, _NEW_POINT);
 213             ctx->Point.SpriteOrigin = value;
 214          }
 215          else {
 216             _mesa_error(ctx, GL_INVALID_ENUM,
 217                         "glPointParameterf[v]{EXT,ARB}(pname)");
 218             return;
 219          }
 220          break;
 221       default:
 222          _mesa_error( ctx, GL_INVALID_ENUM,
 223                       "glPointParameterf[v]{EXT,ARB}(pname)" );
 224          return;
 225    }
 226
 227    if (ctx->Driver.PointParameterfv)
 228       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 229 }
 230 #endif
 231
 232
 233
 234 /**
 235  * Update derived point-related state.
 236  */
 237 void
 238 _mesa_update_point(GLcontext *ctx)
 239 {
 240    /* clamp to user-specified limits now, clamp to ctx->Const.Min/Max
 241     * limits during rasterization.
 242     */
 243    ctx->Point._Size = CLAMP(ctx->Point.Size,
 244                             ctx->Point.MinSize,
 245                             ctx->Point.MaxSize);
 246
 247    ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
 248                              ctx->Point.Params[1] != 0.0 ||
 249                              ctx->Point.Params[2] != 0.0);
 250 }
 251
 252
 253
 254 /**
 255  * Initialize the context point state.
 256  *
 257  * \param ctx GL context.
 258  *
 259  * Initializes __GLcontextRec::Point and point related constants in
 260  * __GLcontextRec::Const.
 261  */
 262 void
 263 _mesa_init_point(GLcontext *ctx)
 264 {
 265    GLuint i;
 266
 267    ctx->Point.SmoothFlag = GL_FALSE;
 268    ctx->Point.Size = 1.0;
 269    ctx->Point._Size = 1.0;
 270    ctx->Point.Params[0] = 1.0;
 271    ctx->Point.Params[1] = 0.0;
 272    ctx->Point.Params[2] = 0.0;
 273    ctx->Point._Attenuated = GL_FALSE;
 274    ctx->Point.MinSize = 0.0;
 275    ctx->Point.MaxSize
 276       = MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA);
 277    ctx->Point.Threshold = 1.0;
 278    ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */
 279    ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */
 280    ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */
 281    for (i = 0; i < MAX_TEXTURE_UNITS; i++) {
 282       ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */
 283    }
 284 }