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    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    GLfloat p[3];
  81    p[0] = (GLfloat) params[0];
  82    if (pname == GL_DISTANCE_ATTENUATION_EXT) {
  83       p[1] = (GLfloat) params[1];
  84       p[2] = (GLfloat) params[2];
  85    }
  86    _mesa_PointParameterfv(pname, p);
  87 }
  88
  89
  90 void GLAPIENTRY
  91 _mesa_PointParameterf( GLenum pname, GLfloat param)
  92 {
  93    GLfloat p[3];
  94    p[0] = param;
  95    p[1] = p[2] = 0.0F;
  96    _mesa_PointParameterfv(pname, p);
  97 }
  98
  99
 100 void GLAPIENTRY
 101 _mesa_PointParameterfv( GLenum pname, const GLfloat *params)
 102 {
 103    GET_CURRENT_CONTEXT(ctx);
 104    ASSERT_OUTSIDE_BEGIN_END(ctx);
 105
 106    switch (pname) {
 107       case GL_DISTANCE_ATTENUATION_EXT:
 108          if (ctx->Extensions.EXT_point_parameters) {
 109             if (TEST_EQ_3V(ctx->Point.Params, params))
 110                return;
 111             FLUSH_VERTICES(ctx, _NEW_POINT);
 112             COPY_3V(ctx->Point.Params, params);
 113             ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
 114                                       ctx->Point.Params[1] != 0.0 ||
 115                                       ctx->Point.Params[2] != 0.0);
 116
 117             if (ctx->Point._Attenuated)
 118                ctx->_TriangleCaps |= DD_POINT_ATTEN;
 119             else
 120                ctx->_TriangleCaps &= ~DD_POINT_ATTEN;
 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          /* This is not completely correct.  GL_POINT_SPRITE_COORD_ORIGIN was
 207           * added to point sprites when the extension was merged into OpenGL
 208           * 2.0.  It is expected that an implementation supporting OpenGL 1.4
 209           * and GL_ARB_point_sprite will generate an error here.
 210           */
 211          if (ctx->Extensions.ARB_point_sprite) {
 212             GLenum value = (GLenum) params[0];
 213             if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) {
 214                _mesa_error(ctx, GL_INVALID_VALUE,
 215                            "glPointParameterf[v]{EXT,ARB}(param)");
 216                return;
 217             }
 218             if (ctx->Point.SpriteOrigin == value)
 219                return;
 220             FLUSH_VERTICES(ctx, _NEW_POINT);
 221             ctx->Point.SpriteOrigin = value;
 222          }
 223          else {
 224             _mesa_error(ctx, GL_INVALID_ENUM,
 225                         "glPointParameterf[v]{EXT,ARB}(pname)");
 226             return;
 227          }
 228          break;
 229       default:
 230          _mesa_error( ctx, GL_INVALID_ENUM,
 231                       "glPointParameterf[v]{EXT,ARB}(pname)" );
 232          return;
 233    }
 234
 235    if (ctx->Driver.PointParameterfv)
 236       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 237 }
 238 #endif
 239
 240
 241
 242 /**
 243  * Initialize the context point state.
 244  *
 245  * \param ctx GL context.
 246  *
 247  * Initializes __GLcontextRec::Point and point related constants in
 248  * __GLcontextRec::Const.
 249  */
 250 void
 251 _mesa_init_point(GLcontext *ctx)
 252 {
 253    GLuint i;
 254
 255    ctx->Point.SmoothFlag = GL_FALSE;
 256    ctx->Point.Size = 1.0;
 257    ctx->Point.Params[0] = 1.0;
 258    ctx->Point.Params[1] = 0.0;
 259    ctx->Point.Params[2] = 0.0;
 260    ctx->Point._Attenuated = GL_FALSE;
 261    ctx->Point.MinSize = 0.0;
 262    ctx->Point.MaxSize
 263       = MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA);
 264    ctx->Point.Threshold = 1.0;
 265    ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */
 266    ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */
 267    ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */
 268    for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
 269       ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */
 270    }
 271 }