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  * 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    GLfloat p[3];
  86    p[0] = (GLfloat) params[0];
  87    if (pname == GL_DISTANCE_ATTENUATION_EXT) {
  88       p[1] = (GLfloat) params[1];
  89       p[2] = (GLfloat) params[2];
  90    }
  91    _mesa_PointParameterfvEXT(pname, p);
  92 }
  93
  94
  95
  96 /*
  97  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
  98  */
  99 void GLAPIENTRY
 100 _mesa_PointParameterfEXT( GLenum pname, GLfloat param)
 101 {
 102    _mesa_PointParameterfvEXT(pname, &param);
 103 }
 104
 105
 106
 107 /*
 108  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
 109  */
 110 void GLAPIENTRY
 111 _mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params)
 112 {
 113    GET_CURRENT_CONTEXT(ctx);
 114    ASSERT_OUTSIDE_BEGIN_END(ctx);
 115
 116    switch (pname) {
 117       case GL_DISTANCE_ATTENUATION_EXT:
 118          if (ctx->Extensions.EXT_point_parameters) {
 119             if (TEST_EQ_3V(ctx->Point.Params, params))
 120                return;
 121             FLUSH_VERTICES(ctx, _NEW_POINT);
 122             COPY_3V(ctx->Point.Params, params);
 123             ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
 124                                       ctx->Point.Params[1] != 0.0 ||
 125                                       ctx->Point.Params[2] != 0.0);
 126
 127             if (ctx->Point._Attenuated)
 128                ctx->_TriangleCaps |= DD_POINT_ATTEN;
 129             else
 130                ctx->_TriangleCaps &= ~DD_POINT_ATTEN;
 131          }
 132          else {
 133             _mesa_error(ctx, GL_INVALID_ENUM,
 134                         "glPointParameterf[v]{EXT,ARB}(pname)");
 135             return;
 136          }
 137          break;
 138       case GL_POINT_SIZE_MIN_EXT:
 139          if (ctx->Extensions.EXT_point_parameters) {
 140             if (params[0] < 0.0F) {
 141                _mesa_error( ctx, GL_INVALID_VALUE,
 142                             "glPointParameterf[v]{EXT,ARB}(param)" );
 143                return;
 144             }
 145             if (ctx->Point.MinSize == params[0])
 146                return;
 147             FLUSH_VERTICES(ctx, _NEW_POINT);
 148             ctx->Point.MinSize = params[0];
 149          }
 150          else {
 151             _mesa_error(ctx, GL_INVALID_ENUM,
 152                         "glPointParameterf[v]{EXT,ARB}(pname)");
 153             return;
 154          }
 155          break;
 156       case GL_POINT_SIZE_MAX_EXT:
 157          if (ctx->Extensions.EXT_point_parameters) {
 158             if (params[0] < 0.0F) {
 159                _mesa_error( ctx, GL_INVALID_VALUE,
 160                             "glPointParameterf[v]{EXT,ARB}(param)" );
 161                return;
 162             }
 163             if (ctx->Point.MaxSize == params[0])
 164                return;
 165             FLUSH_VERTICES(ctx, _NEW_POINT);
 166             ctx->Point.MaxSize = params[0];
 167          }
 168          else {
 169             _mesa_error(ctx, GL_INVALID_ENUM,
 170                         "glPointParameterf[v]{EXT,ARB}(pname)");
 171             return;
 172          }
 173          break;
 174       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 175          if (ctx->Extensions.EXT_point_parameters) {
 176             if (params[0] < 0.0F) {
 177                _mesa_error( ctx, GL_INVALID_VALUE,
 178                             "glPointParameterf[v]{EXT,ARB}(param)" );
 179                return;
 180             }
 181             if (ctx->Point.Threshold == params[0])
 182                return;
 183             FLUSH_VERTICES(ctx, _NEW_POINT);
 184             ctx->Point.Threshold = params[0];
 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_R_MODE_NV:
 193          /* This is one area where ARB_point_sprite and NV_point_sprite
 194           * differ.  In ARB_point_sprite the POINT_SPRITE_R_MODE is
 195           * always ZERO.  NV_point_sprite adds the S and R modes.
 196           */
 197          if (ctx->Extensions.NV_point_sprite) {
 198             GLenum value = (GLenum) params[0];
 199             if (value != GL_ZERO && value != GL_S && value != GL_R) {
 200                _mesa_error(ctx, GL_INVALID_VALUE,
 201                            "glPointParameterf[v]{EXT,ARB}(param)");
 202                return;
 203             }
 204             if (ctx->Point.SpriteRMode == value)
 205                return;
 206             FLUSH_VERTICES(ctx, _NEW_POINT);
 207             ctx->Point.SpriteRMode = value;
 208          }
 209          else {
 210             _mesa_error(ctx, GL_INVALID_ENUM,
 211                         "glPointParameterf[v]{EXT,ARB}(pname)");
 212             return;
 213          }
 214          break;
 215       case GL_POINT_SPRITE_COORD_ORIGIN:
 216          if (ctx->Extensions.ARB_point_sprite) {
 217             GLenum value = (GLenum) params[0];
 218             if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) {
 219                _mesa_error(ctx, GL_INVALID_VALUE,
 220                            "glPointParameterf[v]{EXT,ARB}(param)");
 221                return;
 222             }
 223             if (ctx->Point.SpriteOrigin == value)
 224                return;
 225             FLUSH_VERTICES(ctx, _NEW_POINT);
 226             ctx->Point.SpriteOrigin = value;
 227          }
 228          else {
 229             _mesa_error(ctx, GL_INVALID_ENUM,
 230                         "glPointParameterf[v]{EXT,ARB}(pname)");
 231             return;
 232          }
 233          break;
 234       default:
 235          _mesa_error( ctx, GL_INVALID_ENUM,
 236                       "glPointParameterf[v]{EXT,ARB}(pname)" );
 237          return;
 238    }
 239
 240    if (ctx->Driver.PointParameterfv)
 241       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 242 }
 243 #endif
 244
 245
 246
 247 /**
 248  * Initialize the context point state.
 249  *
 250  * \param ctx GL context.
 251  *
 252  * Initializes __GLcontextRec::Point and point related constants in
 253  * __GLcontextRec::Const.
 254  */
 255 void
 256 _mesa_init_point(GLcontext *ctx)
 257 {
 258    GLuint i;
 259
 260    ctx->Point.SmoothFlag = GL_FALSE;
 261    ctx->Point.Size = 1.0;
 262    ctx->Point.Params[0] = 1.0;
 263    ctx->Point.Params[1] = 0.0;
 264    ctx->Point.Params[2] = 0.0;
 265    ctx->Point._Attenuated = GL_FALSE;
 266    ctx->Point.MinSize = 0.0;
 267    ctx->Point.MaxSize
 268       = MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA);
 269    ctx->Point.Threshold = 1.0;
 270    ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */
 271    ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */
 272    ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */
 273    for (i = 0; i < MAX_TEXTURE_UNITS; i++) {
 274       ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */
 275    }
 276 }