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    /* Drivers that support point sprites must also support point parameters.
 108     * If point parameters aren't supported, then this function shouldn't even
 109     * exist.
 110     */
 111    ASSERT(!(ctx->Extensions.ARB_point_sprite
 112             || ctx->Extensions.NV_point_sprite)
 113           || ctx->Extensions.EXT_point_parameters);
 114
 115    if (!ctx->Extensions.EXT_point_parameters) {
 116       _mesa_error(ctx, GL_INVALID_OPERATION,
 117                   "unsupported function called (unsupported extension)");
 118       return;
 119    }
 120
 121    switch (pname) {
 122       case GL_DISTANCE_ATTENUATION_EXT:
 123          if (TEST_EQ_3V(ctx->Point.Params, params))
 124             return;
 125          FLUSH_VERTICES(ctx, _NEW_POINT);
 126          COPY_3V(ctx->Point.Params, params);
 127          ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
 128                                    ctx->Point.Params[1] != 0.0 ||
 129                                    ctx->Point.Params[2] != 0.0);
 130
 131          if (ctx->Point._Attenuated)
 132             ctx->_TriangleCaps |= DD_POINT_ATTEN;
 133          else
 134             ctx->_TriangleCaps &= ~DD_POINT_ATTEN;
 135          break;
 136       case GL_POINT_SIZE_MIN_EXT:
 137          if (params[0] < 0.0F) {
 138             _mesa_error( ctx, GL_INVALID_VALUE,
 139                          "glPointParameterf[v]{EXT,ARB}(param)" );
 140             return;
 141          }
 142          if (ctx->Point.MinSize == params[0])
 143             return;
 144          FLUSH_VERTICES(ctx, _NEW_POINT);
 145          ctx->Point.MinSize = params[0];
 146          break;
 147       case GL_POINT_SIZE_MAX_EXT:
 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          break;
 158       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 159          if (params[0] < 0.0F) {
 160             _mesa_error( ctx, GL_INVALID_VALUE,
 161                          "glPointParameterf[v]{EXT,ARB}(param)" );
 162             return;
 163          }
 164          if (ctx->Point.Threshold == params[0])
 165             return;
 166          FLUSH_VERTICES(ctx, _NEW_POINT);
 167          ctx->Point.Threshold = params[0];
 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 (_mesa_is_desktop_gl(ctx) && 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          /* GL_POINT_SPRITE_COORD_ORIGIN was added to point sprites when the
 194           * extension was merged into OpenGL 2.0.
 195           */
 196          if ((ctx->API == API_OPENGL && ctx->Version >= 20)
 197              || ctx->API == API_OPENGL_CORE) {
 198             GLenum value = (GLenum) params[0];
 199             if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) {
 200                _mesa_error(ctx, GL_INVALID_VALUE,
 201                            "glPointParameterf[v]{EXT,ARB}(param)");
 202                return;
 203             }
 204             if (ctx->Point.SpriteOrigin == value)
 205                return;
 206             FLUSH_VERTICES(ctx, _NEW_POINT);
 207             ctx->Point.SpriteOrigin = value;
 208          }
 209          else {
 210             _mesa_error(ctx, GL_INVALID_ENUM,
 211                         "glPointParameterf[v]{EXT,ARB}(pname)");
 212             return;
 213          }
 214          break;
 215       default:
 216          _mesa_error( ctx, GL_INVALID_ENUM,
 217                       "glPointParameterf[v]{EXT,ARB}(pname)" );
 218          return;
 219    }
 220
 221    if (ctx->Driver.PointParameterfv)
 222       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 223 }
 224 #endif
 225
 226
 227
 228 /**
 229  * Initialize the context point state.
 230  *
 231  * \param ctx GL context.
 232  *
 233  * Initializes __struct gl_contextRec::Point and point related constants in
 234  * __struct gl_contextRec::Const.
 235  */
 236 void
 237 _mesa_init_point(struct gl_context *ctx)
 238 {
 239    GLuint i;
 240
 241    ctx->Point.SmoothFlag = GL_FALSE;
 242    ctx->Point.Size = 1.0;
 243    ctx->Point.Params[0] = 1.0;
 244    ctx->Point.Params[1] = 0.0;
 245    ctx->Point.Params[2] = 0.0;
 246    ctx->Point._Attenuated = GL_FALSE;
 247    ctx->Point.MinSize = 0.0;
 248    ctx->Point.MaxSize
 249       = MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA);
 250    ctx->Point.Threshold = 1.0;
 251    ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */
 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 < Elements(ctx->Point.CoordReplace); i++) {
 255       ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */
 256    }
 257 }