src/mesa/main/points.c

   1 /**
   2  * \file points.c
   3  * Point operations.
   4  */
   5
   6 /*
   7  * Mesa 3-D graphics library
   8  * Version:  7.1
   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    GLfloat p[3];
  73    p[0] = (GLfloat) param;
  74    p[1] = p[2] = 0.0F;
  75    _mesa_PointParameterfv(pname, p);
  76 }
  77
  78
  79 void GLAPIENTRY
  80 _mesa_PointParameteriv( GLenum pname, const GLint *params )
  81 {
  82    GLfloat p[3];
  83    p[0] = (GLfloat) params[0];
  84    if (pname == GL_DISTANCE_ATTENUATION_EXT) {
  85       p[1] = (GLfloat) params[1];
  86       p[2] = (GLfloat) params[2];
  87    }
  88    _mesa_PointParameterfv(pname, p);
  89 }
  90
  91
  92 void GLAPIENTRY
  93 _mesa_PointParameterf( GLenum pname, GLfloat param)
  94 {
  95    GLfloat p[3];
  96    p[0] = param;
  97    p[1] = p[2] = 0.0F;
  98    _mesa_PointParameterfv(pname, p);
  99 }
 100
 101
 102 void GLAPIENTRY
 103 _mesa_PointParameterfv( GLenum pname, const GLfloat *params)
 104 {
 105    GET_CURRENT_CONTEXT(ctx);
 106    ASSERT_OUTSIDE_BEGIN_END(ctx);
 107
 108    switch (pname) {
 109       case GL_DISTANCE_ATTENUATION_EXT:
 110          if (ctx->Extensions.EXT_point_parameters) {
 111             if (TEST_EQ_3V(ctx->Point.Params, params))
 112                return;
 113             FLUSH_VERTICES(ctx, _NEW_POINT);
 114             COPY_3V(ctx->Point.Params, params);
 115             ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
 116                                       ctx->Point.Params[1] != 0.0 ||
 117                                       ctx->Point.Params[2] != 0.0);
 118
 119             if (ctx->Point._Attenuated)
 120                ctx->_TriangleCaps |= DD_POINT_ATTEN;
 121             else
 122                ctx->_TriangleCaps &= ~DD_POINT_ATTEN;
 123          }
 124          else {
 125             _mesa_error(ctx, GL_INVALID_ENUM,
 126                         "glPointParameterf[v]{EXT,ARB}(pname)");
 127             return;
 128          }
 129          break;
 130       case GL_POINT_SIZE_MIN_EXT:
 131          if (ctx->Extensions.EXT_point_parameters) {
 132             if (params[0] < 0.0F) {
 133                _mesa_error( ctx, GL_INVALID_VALUE,
 134                             "glPointParameterf[v]{EXT,ARB}(param)" );
 135                return;
 136             }
 137             if (ctx->Point.MinSize == params[0])
 138                return;
 139             FLUSH_VERTICES(ctx, _NEW_POINT);
 140             ctx->Point.MinSize = params[0];
 141          }
 142          else {
 143             _mesa_error(ctx, GL_INVALID_ENUM,
 144                         "glPointParameterf[v]{EXT,ARB}(pname)");
 145             return;
 146          }
 147          break;
 148       case GL_POINT_SIZE_MAX_EXT:
 149          if (ctx->Extensions.EXT_point_parameters) {
 150             if (params[0] < 0.0F) {
 151                _mesa_error( ctx, GL_INVALID_VALUE,
 152                             "glPointParameterf[v]{EXT,ARB}(param)" );
 153                return;
 154             }
 155             if (ctx->Point.MaxSize == params[0])
 156                return;
 157             FLUSH_VERTICES(ctx, _NEW_POINT);
 158             ctx->Point.MaxSize = params[0];
 159          }
 160          else {
 161             _mesa_error(ctx, GL_INVALID_ENUM,
 162                         "glPointParameterf[v]{EXT,ARB}(pname)");
 163             return;
 164          }
 165          break;
 166       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 167          if (ctx->Extensions.EXT_point_parameters) {
 168             if (params[0] < 0.0F) {
 169                _mesa_error( ctx, GL_INVALID_VALUE,
 170                             "glPointParameterf[v]{EXT,ARB}(param)" );
 171                return;
 172             }
 173             if (ctx->Point.Threshold == params[0])
 174                return;
 175             FLUSH_VERTICES(ctx, _NEW_POINT);
 176             ctx->Point.Threshold = params[0];
 177          }
 178          else {
 179             _mesa_error(ctx, GL_INVALID_ENUM,
 180                         "glPointParameterf[v]{EXT,ARB}(pname)");
 181             return;
 182          }
 183          break;
 184       case GL_POINT_SPRITE_R_MODE_NV:
 185          /* This is one area where ARB_point_sprite and NV_point_sprite
 186           * differ.  In ARB_point_sprite the POINT_SPRITE_R_MODE is
 187           * always ZERO.  NV_point_sprite adds the S and R modes.
 188           */
 189          if (ctx->Extensions.NV_point_sprite) {
 190             GLenum value = (GLenum) params[0];
 191             if (value != GL_ZERO && value != GL_S && value != GL_R) {
 192                _mesa_error(ctx, GL_INVALID_VALUE,
 193                            "glPointParameterf[v]{EXT,ARB}(param)");
 194                return;
 195             }
 196             if (ctx->Point.SpriteRMode == value)
 197                return;
 198             FLUSH_VERTICES(ctx, _NEW_POINT);
 199             ctx->Point.SpriteRMode = value;
 200          }
 201          else {
 202             _mesa_error(ctx, GL_INVALID_ENUM,
 203                         "glPointParameterf[v]{EXT,ARB}(pname)");
 204             return;
 205          }
 206          break;
 207       case GL_POINT_SPRITE_COORD_ORIGIN:
 208          /* This is not completely correct.  GL_POINT_SPRITE_COORD_ORIGIN was
 209           * added to point sprites when the extension was merged into OpenGL
 210           * 2.0.  It is expected that an implementation supporting OpenGL 1.4
 211           * and GL_ARB_point_sprite will generate an error here.
 212           */
 213          if (ctx->Extensions.ARB_point_sprite) {
 214             GLenum value = (GLenum) params[0];
 215             if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) {
 216                _mesa_error(ctx, GL_INVALID_VALUE,
 217                            "glPointParameterf[v]{EXT,ARB}(param)");
 218                return;
 219             }
 220             if (ctx->Point.SpriteOrigin == value)
 221                return;
 222             FLUSH_VERTICES(ctx, _NEW_POINT);
 223             ctx->Point.SpriteOrigin = value;
 224          }
 225          else {
 226             _mesa_error(ctx, GL_INVALID_ENUM,
 227                         "glPointParameterf[v]{EXT,ARB}(pname)");
 228             return;
 229          }
 230          break;
 231       default:
 232          _mesa_error( ctx, GL_INVALID_ENUM,
 233                       "glPointParameterf[v]{EXT,ARB}(pname)" );
 234          return;
 235    }
 236
 237    if (ctx->Driver.PointParameterfv)
 238       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 239 }
 240 #endif
 241
 242
 243
 244 /**
 245  * Initialize the context point state.
 246  *
 247  * \param ctx GL context.
 248  *
 249  * Initializes __GLcontextRec::Point and point related constants in
 250  * __GLcontextRec::Const.
 251  */
 252 void
 253 _mesa_init_point(GLcontext *ctx)
 254 {
 255    GLuint i;
 256
 257    ctx->Point.SmoothFlag = GL_FALSE;
 258    ctx->Point.Size = 1.0;
 259    ctx->Point.Params[0] = 1.0;
 260    ctx->Point.Params[1] = 0.0;
 261    ctx->Point.Params[2] = 0.0;
 262    ctx->Point._Attenuated = GL_FALSE;
 263    ctx->Point.MinSize = 0.0;
 264    ctx->Point.MaxSize
 265       = MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA);
 266    ctx->Point.Threshold = 1.0;
 267    ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */
 268    ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */
 269    ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */
 270    for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
 271       ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */
 272    }
 273 }