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 void GLAPIENTRY
  70 _mesa_PointParameteri( GLenum pname, GLint param )
  71 {
  72    const GLfloat value = (GLfloat) param;
  73    _mesa_PointParameterfv(pname, &value);
  74 }
  75
  76
  77 void GLAPIENTRY
  78 _mesa_PointParameteriv( GLenum pname, const GLint *params )
  79 {
  80    const GLfloat value = (GLfloat) params[0];
  81    _mesa_PointParameterfv(pname, &value);
  82 }
  83
  84
  85 void GLAPIENTRY
  86 _mesa_PointParameterf( GLenum pname, GLfloat param)
  87 {
  88    _mesa_PointParameterfv(pname, &param);
  89 }
  90
  91
  92 void GLAPIENTRY
  93 _mesa_PointParameterfv( GLenum pname, const GLfloat *params)
  94 {
  95    GET_CURRENT_CONTEXT(ctx);
  96    ASSERT_OUTSIDE_BEGIN_END(ctx);
  97
  98    switch (pname) {
  99       case GL_DISTANCE_ATTENUATION_EXT:
 100          if (ctx->Extensions.EXT_point_parameters) {
 101             if (TEST_EQ_3V(ctx->Point.Params, params))
 102                return;
 103             FLUSH_VERTICES(ctx, _NEW_POINT);
 104             COPY_3V(ctx->Point.Params, params);
 105             ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
 106                                       ctx->Point.Params[1] != 0.0 ||
 107                                       ctx->Point.Params[2] != 0.0);
 108          }
 109          else {
 110             _mesa_error(ctx, GL_INVALID_ENUM,
 111                         "glPointParameterf[v]{EXT,ARB}(pname)");
 112             return;
 113          }
 114          break;
 115       case GL_POINT_SIZE_MIN_EXT:
 116          if (ctx->Extensions.EXT_point_parameters) {
 117             if (params[0] < 0.0F) {
 118                _mesa_error( ctx, GL_INVALID_VALUE,
 119                             "glPointParameterf[v]{EXT,ARB}(param)" );
 120                return;
 121             }
 122             if (ctx->Point.MinSize == params[0])
 123                return;
 124             FLUSH_VERTICES(ctx, _NEW_POINT);
 125             ctx->Point.MinSize = params[0];
 126          }
 127          else {
 128             _mesa_error(ctx, GL_INVALID_ENUM,
 129                         "glPointParameterf[v]{EXT,ARB}(pname)");
 130             return;
 131          }
 132          break;
 133       case GL_POINT_SIZE_MAX_EXT:
 134          if (ctx->Extensions.EXT_point_parameters) {
 135             if (params[0] < 0.0F) {
 136                _mesa_error( ctx, GL_INVALID_VALUE,
 137                             "glPointParameterf[v]{EXT,ARB}(param)" );
 138                return;
 139             }
 140             if (ctx->Point.MaxSize == params[0])
 141                return;
 142             FLUSH_VERTICES(ctx, _NEW_POINT);
 143             ctx->Point.MaxSize = params[0];
 144          }
 145          else {
 146             _mesa_error(ctx, GL_INVALID_ENUM,
 147                         "glPointParameterf[v]{EXT,ARB}(pname)");
 148             return;
 149          }
 150          break;
 151       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 152          if (ctx->Extensions.EXT_point_parameters) {
 153             if (params[0] < 0.0F) {
 154                _mesa_error( ctx, GL_INVALID_VALUE,
 155                             "glPointParameterf[v]{EXT,ARB}(param)" );
 156                return;
 157             }
 158             if (ctx->Point.Threshold == params[0])
 159                return;
 160             FLUSH_VERTICES(ctx, _NEW_POINT);
 161             ctx->Point.Threshold = params[0];
 162          }
 163          else {
 164             _mesa_error(ctx, GL_INVALID_ENUM,
 165                         "glPointParameterf[v]{EXT,ARB}(pname)");
 166             return;
 167          }
 168          break;
 169       case GL_POINT_SPRITE_R_MODE_NV:
 170          /* This is one area where ARB_point_sprite and NV_point_sprite
 171           * differ.  In ARB_point_sprite the POINT_SPRITE_R_MODE is
 172           * always ZERO.  NV_point_sprite adds the S and R modes.
 173           */
 174          if (ctx->Extensions.NV_point_sprite) {
 175             GLenum value = (GLenum) params[0];
 176             if (value != GL_ZERO && value != GL_S && value != GL_R) {
 177                _mesa_error(ctx, GL_INVALID_VALUE,
 178                            "glPointParameterf[v]{EXT,ARB}(param)");
 179                return;
 180             }
 181             if (ctx->Point.SpriteRMode == value)
 182                return;
 183             FLUSH_VERTICES(ctx, _NEW_POINT);
 184             ctx->Point.SpriteRMode = value;
 185          }
 186          else {
 187             _mesa_error(ctx, GL_INVALID_ENUM,
 188                         "glPointParameterf[v]{EXT,ARB}(pname)");
 189             return;
 190          }
 191          break;
 192       case GL_POINT_SPRITE_COORD_ORIGIN:
 193          if (ctx->Extensions.ARB_point_sprite) {
 194             GLenum value = (GLenum) params[0];
 195             if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) {
 196                _mesa_error(ctx, GL_INVALID_VALUE,
 197                            "glPointParameterf[v]{EXT,ARB}(param)");
 198                return;
 199             }
 200             if (ctx->Point.SpriteOrigin == value)
 201                return;
 202             FLUSH_VERTICES(ctx, _NEW_POINT);
 203             ctx->Point.SpriteOrigin = value;
 204          }
 205          else {
 206             _mesa_error(ctx, GL_INVALID_ENUM,
 207                         "glPointParameterf[v]{EXT,ARB}(pname)");
 208             return;
 209          }
 210          break;
 211       default:
 212          _mesa_error( ctx, GL_INVALID_ENUM,
 213                       "glPointParameterf[v]{EXT,ARB}(pname)" );
 214          return;
 215    }
 216
 217    if (ctx->Driver.PointParameterfv)
 218       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 219 }
 220 #endif
 221
 222
 223
 224 /**
 225  * Initialize the context point state.
 226  *
 227  * \param ctx GL context.
 228  *
 229  * Initializes __GLcontextRec::Point and point related constants in
 230  * __GLcontextRec::Const.
 231  */
 232 void
 233 _mesa_init_point(GLcontext *ctx)
 234 {
 235    GLuint i;
 236
 237    ctx->Point.SmoothFlag = GL_FALSE;
 238    ctx->Point.Size = 1.0;
 239    ctx->Point.Params[0] = 1.0;
 240    ctx->Point.Params[1] = 0.0;
 241    ctx->Point.Params[2] = 0.0;
 242    ctx->Point._Attenuated = GL_FALSE;
 243    ctx->Point.MinSize = 0.0;
 244    ctx->Point.MaxSize
 245       = MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA);
 246    ctx->Point.Threshold = 1.0;
 247 #if FEATURE_es2_glsl
 248    ctx->Point.PointSprite = GL_TRUE; /* GL_ARB/NV_point_sprite */
 249 #else
 250    ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */
 251 #endif
 252    ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */
 253    ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */
 254    for (i = 0; i < MAX_TEXTURE_UNITS; i++) {
 255       ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */
 256    }
 257 }