src/mesa/main/points.c

   1 /**
   2  * \file points.c
   3  * Point operations.
   4  */
   5
   6 /*
   7  * Mesa 3-D graphics library
   8  * Version:  7.0
   9  *
  10  * Copyright (C) 1999-2007  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             ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
 119                                       ctx->Point.Params[1] != 0.0 ||
 120                                       ctx->Point.Params[2] != 0.0);
 121          }
 122          else {
 123             _mesa_error(ctx, GL_INVALID_ENUM,
 124                         "glPointParameterf[v]{EXT,ARB}(pname)");
 125             return;
 126          }
 127          break;
 128       case GL_POINT_SIZE_MIN_EXT:
 129          if (ctx->Extensions.EXT_point_parameters) {
 130             if (params[0] < 0.0F) {
 131                _mesa_error( ctx, GL_INVALID_VALUE,
 132                             "glPointParameterf[v]{EXT,ARB}(param)" );
 133                return;
 134             }
 135             if (ctx->Point.MinSize == params[0])
 136                return;
 137             FLUSH_VERTICES(ctx, _NEW_POINT);
 138             ctx->Point.MinSize = params[0];
 139          }
 140          else {
 141             _mesa_error(ctx, GL_INVALID_ENUM,
 142                         "glPointParameterf[v]{EXT,ARB}(pname)");
 143             return;
 144          }
 145          break;
 146       case GL_POINT_SIZE_MAX_EXT:
 147          if (ctx->Extensions.EXT_point_parameters) {
 148             if (params[0] < 0.0F) {
 149                _mesa_error( ctx, GL_INVALID_VALUE,
 150                             "glPointParameterf[v]{EXT,ARB}(param)" );
 151                return;
 152             }
 153             if (ctx->Point.MaxSize == params[0])
 154                return;
 155             FLUSH_VERTICES(ctx, _NEW_POINT);
 156             ctx->Point.MaxSize = params[0];
 157          }
 158          else {
 159             _mesa_error(ctx, GL_INVALID_ENUM,
 160                         "glPointParameterf[v]{EXT,ARB}(pname)");
 161             return;
 162          }
 163          break;
 164       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 165          if (ctx->Extensions.EXT_point_parameters) {
 166             if (params[0] < 0.0F) {
 167                _mesa_error( ctx, GL_INVALID_VALUE,
 168                             "glPointParameterf[v]{EXT,ARB}(param)" );
 169                return;
 170             }
 171             if (ctx->Point.Threshold == params[0])
 172                return;
 173             FLUSH_VERTICES(ctx, _NEW_POINT);
 174             ctx->Point.Threshold = params[0];
 175          }
 176          else {
 177             _mesa_error(ctx, GL_INVALID_ENUM,
 178                         "glPointParameterf[v]{EXT,ARB}(pname)");
 179             return;
 180          }
 181          break;
 182       case GL_POINT_SPRITE_R_MODE_NV:
 183          /* This is one area where ARB_point_sprite and NV_point_sprite
 184           * differ.  In ARB_point_sprite the POINT_SPRITE_R_MODE is
 185           * always ZERO.  NV_point_sprite adds the S and R modes.
 186           */
 187          if (ctx->Extensions.NV_point_sprite) {
 188             GLenum value = (GLenum) params[0];
 189             if (value != GL_ZERO && value != GL_S && value != GL_R) {
 190                _mesa_error(ctx, GL_INVALID_VALUE,
 191                            "glPointParameterf[v]{EXT,ARB}(param)");
 192                return;
 193             }
 194             if (ctx->Point.SpriteRMode == value)
 195                return;
 196             FLUSH_VERTICES(ctx, _NEW_POINT);
 197             ctx->Point.SpriteRMode = value;
 198          }
 199          else {
 200             _mesa_error(ctx, GL_INVALID_ENUM,
 201                         "glPointParameterf[v]{EXT,ARB}(pname)");
 202             return;
 203          }
 204          break;
 205       case GL_POINT_SPRITE_COORD_ORIGIN:
 206          if (ctx->Extensions.ARB_point_sprite) {
 207             GLenum value = (GLenum) params[0];
 208             if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) {
 209                _mesa_error(ctx, GL_INVALID_VALUE,
 210                            "glPointParameterf[v]{EXT,ARB}(param)");
 211                return;
 212             }
 213             if (ctx->Point.SpriteOrigin == value)
 214                return;
 215             FLUSH_VERTICES(ctx, _NEW_POINT);
 216             ctx->Point.SpriteOrigin = value;
 217          }
 218          else {
 219             _mesa_error(ctx, GL_INVALID_ENUM,
 220                         "glPointParameterf[v]{EXT,ARB}(pname)");
 221             return;
 222          }
 223          break;
 224       default:
 225          _mesa_error( ctx, GL_INVALID_ENUM,
 226                       "glPointParameterf[v]{EXT,ARB}(pname)" );
 227          return;
 228    }
 229
 230    if (ctx->Driver.PointParameterfv)
 231       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 232 }
 233 #endif
 234
 235
 236
 237 /**
 238  * Initialize the context point state.
 239  *
 240  * \param ctx GL context.
 241  *
 242  * Initializes __GLcontextRec::Point and point related constants in
 243  * __GLcontextRec::Const.
 244  */
 245 void
 246 _mesa_init_point(GLcontext *ctx)
 247 {
 248    GLuint i;
 249
 250    ctx->Point.SmoothFlag = GL_FALSE;
 251    ctx->Point.Size = 1.0;
 252    ctx->Point.Params[0] = 1.0;
 253    ctx->Point.Params[1] = 0.0;
 254    ctx->Point.Params[2] = 0.0;
 255    ctx->Point._Attenuated = GL_FALSE;
 256    ctx->Point.MinSize = 0.0;
 257    ctx->Point.MaxSize
 258       = MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA);
 259    ctx->Point.Threshold = 1.0;
 260    ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */
 261    ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */
 262    ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */
 263    for (i = 0; i < MAX_TEXTURE_UNITS; i++) {
 264       ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */
 265    }
 266 }