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 "mtypes.h"
  36
  37
  38 /**
  39  * Set current point size.
  40  * \param size  point diameter in pixels
  41  * \sa glPointSize().
  42  */
  43 void GLAPIENTRY
  44 _mesa_PointSize( GLfloat size )
  45 {
  46    GET_CURRENT_CONTEXT(ctx);
  47    ASSERT_OUTSIDE_BEGIN_END(ctx);
  48
  49    if (size <= 0.0) {
  50       _mesa_error( ctx, GL_INVALID_VALUE, "glPointSize" );
  51       return;
  52    }
  53
  54    if (ctx->Point.Size == size)
  55       return;
  56
  57    FLUSH_VERTICES(ctx, _NEW_POINT);
  58    ctx->Point.Size = size;
  59
  60    if (ctx->Driver.PointSize)
  61       ctx->Driver.PointSize(ctx, size);
  62 }
  63
  64
  65 #if _HAVE_FULL_GL
  66
  67
  68 void GLAPIENTRY
  69 _mesa_PointParameteri( GLenum pname, GLint param )
  70 {
  71    GLfloat p[3];
  72    p[0] = (GLfloat) param;
  73    p[1] = p[2] = 0.0F;
  74    _mesa_PointParameterfv(pname, p);
  75 }
  76
  77
  78 void GLAPIENTRY
  79 _mesa_PointParameteriv( GLenum pname, const GLint *params )
  80 {
  81    GLfloat p[3];
  82    p[0] = (GLfloat) params[0];
  83    if (pname == GL_DISTANCE_ATTENUATION_EXT) {
  84       p[1] = (GLfloat) params[1];
  85       p[2] = (GLfloat) params[2];
  86    }
  87    _mesa_PointParameterfv(pname, p);
  88 }
  89
  90
  91 void GLAPIENTRY
  92 _mesa_PointParameterf( GLenum pname, GLfloat param)
  93 {
  94    GLfloat p[3];
  95    p[0] = param;
  96    p[1] = p[2] = 0.0F;
  97    _mesa_PointParameterfv(pname, p);
  98 }
  99
 100
 101 void GLAPIENTRY
 102 _mesa_PointParameterfv( GLenum pname, const GLfloat *params)
 103 {
 104    GET_CURRENT_CONTEXT(ctx);
 105    ASSERT_OUTSIDE_BEGIN_END(ctx);
 106
 107    switch (pname) {
 108       case GL_DISTANCE_ATTENUATION_EXT:
 109          if (ctx->Extensions.EXT_point_parameters) {
 110             if (TEST_EQ_3V(ctx->Point.Params, params))
 111                return;
 112             FLUSH_VERTICES(ctx, _NEW_POINT);
 113             COPY_3V(ctx->Point.Params, params);
 114             ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
 115                                       ctx->Point.Params[1] != 0.0 ||
 116                                       ctx->Point.Params[2] != 0.0);
 117
 118             if (ctx->Point._Attenuated)
 119                ctx->_TriangleCaps |= DD_POINT_ATTEN;
 120             else
 121                ctx->_TriangleCaps &= ~DD_POINT_ATTEN;
 122          }
 123          else {
 124             _mesa_error(ctx, GL_INVALID_ENUM,
 125                         "glPointParameterf[v]{EXT,ARB}(pname)");
 126             return;
 127          }
 128          break;
 129       case GL_POINT_SIZE_MIN_EXT:
 130          if (ctx->Extensions.EXT_point_parameters) {
 131             if (params[0] < 0.0F) {
 132                _mesa_error( ctx, GL_INVALID_VALUE,
 133                             "glPointParameterf[v]{EXT,ARB}(param)" );
 134                return;
 135             }
 136             if (ctx->Point.MinSize == params[0])
 137                return;
 138             FLUSH_VERTICES(ctx, _NEW_POINT);
 139             ctx->Point.MinSize = params[0];
 140          }
 141          else {
 142             _mesa_error(ctx, GL_INVALID_ENUM,
 143                         "glPointParameterf[v]{EXT,ARB}(pname)");
 144             return;
 145          }
 146          break;
 147       case GL_POINT_SIZE_MAX_EXT:
 148          if (ctx->Extensions.EXT_point_parameters) {
 149             if (params[0] < 0.0F) {
 150                _mesa_error( ctx, GL_INVALID_VALUE,
 151                             "glPointParameterf[v]{EXT,ARB}(param)" );
 152                return;
 153             }
 154             if (ctx->Point.MaxSize == params[0])
 155                return;
 156             FLUSH_VERTICES(ctx, _NEW_POINT);
 157             ctx->Point.MaxSize = params[0];
 158          }
 159          else {
 160             _mesa_error(ctx, GL_INVALID_ENUM,
 161                         "glPointParameterf[v]{EXT,ARB}(pname)");
 162             return;
 163          }
 164          break;
 165       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 166          if (ctx->Extensions.EXT_point_parameters) {
 167             if (params[0] < 0.0F) {
 168                _mesa_error( ctx, GL_INVALID_VALUE,
 169                             "glPointParameterf[v]{EXT,ARB}(param)" );
 170                return;
 171             }
 172             if (ctx->Point.Threshold == params[0])
 173                return;
 174             FLUSH_VERTICES(ctx, _NEW_POINT);
 175             ctx->Point.Threshold = params[0];
 176          }
 177          else {
 178             _mesa_error(ctx, GL_INVALID_ENUM,
 179                         "glPointParameterf[v]{EXT,ARB}(pname)");
 180             return;
 181          }
 182          break;
 183       case GL_POINT_SPRITE_R_MODE_NV:
 184          /* This is one area where ARB_point_sprite and NV_point_sprite
 185           * differ.  In ARB_point_sprite the POINT_SPRITE_R_MODE is
 186           * always ZERO.  NV_point_sprite adds the S and R modes.
 187           */
 188          if (ctx->Extensions.NV_point_sprite) {
 189             GLenum value = (GLenum) params[0];
 190             if (value != GL_ZERO && value != GL_S && value != GL_R) {
 191                _mesa_error(ctx, GL_INVALID_VALUE,
 192                            "glPointParameterf[v]{EXT,ARB}(param)");
 193                return;
 194             }
 195             if (ctx->Point.SpriteRMode == value)
 196                return;
 197             FLUSH_VERTICES(ctx, _NEW_POINT);
 198             ctx->Point.SpriteRMode = value;
 199          }
 200          else {
 201             _mesa_error(ctx, GL_INVALID_ENUM,
 202                         "glPointParameterf[v]{EXT,ARB}(pname)");
 203             return;
 204          }
 205          break;
 206       case GL_POINT_SPRITE_COORD_ORIGIN:
 207          /* This is not completely correct.  GL_POINT_SPRITE_COORD_ORIGIN was
 208           * added to point sprites when the extension was merged into OpenGL
 209           * 2.0.  It is expected that an implementation supporting OpenGL 1.4
 210           * and GL_ARB_point_sprite will generate an error here.
 211           */
 212          if (ctx->Extensions.ARB_point_sprite) {
 213             GLenum value = (GLenum) params[0];
 214             if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) {
 215                _mesa_error(ctx, GL_INVALID_VALUE,
 216                            "glPointParameterf[v]{EXT,ARB}(param)");
 217                return;
 218             }
 219             if (ctx->Point.SpriteOrigin == value)
 220                return;
 221             FLUSH_VERTICES(ctx, _NEW_POINT);
 222             ctx->Point.SpriteOrigin = value;
 223          }
 224          else {
 225             _mesa_error(ctx, GL_INVALID_ENUM,
 226                         "glPointParameterf[v]{EXT,ARB}(pname)");
 227             return;
 228          }
 229          break;
 230       default:
 231          _mesa_error( ctx, GL_INVALID_ENUM,
 232                       "glPointParameterf[v]{EXT,ARB}(pname)" );
 233          return;
 234    }
 235
 236    if (ctx->Driver.PointParameterfv)
 237       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 238 }
 239 #endif
 240
 241
 242
 243 /**
 244  * Initialize the context point state.
 245  *
 246  * \param ctx GL context.
 247  *
 248  * Initializes __struct gl_contextRec::Point and point related constants in
 249  * __struct gl_contextRec::Const.
 250  */
 251 void
 252 _mesa_init_point(struct gl_context *ctx)
 253 {
 254    GLuint i;
 255
 256    ctx->Point.SmoothFlag = GL_FALSE;
 257    ctx->Point.Size = 1.0;
 258    ctx->Point.Params[0] = 1.0;
 259    ctx->Point.Params[1] = 0.0;
 260    ctx->Point.Params[2] = 0.0;
 261    ctx->Point._Attenuated = GL_FALSE;
 262    ctx->Point.MinSize = 0.0;
 263    ctx->Point.MaxSize
 264       = MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA);
 265    ctx->Point.Threshold = 1.0;
 266    ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */
 267    ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */
 268    ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */
 269    for (i = 0; i < Elements(ctx->Point.CoordReplace); i++) {
 270       ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */
 271    }
 272 }