src/mesa/main/points.c

   1 /**
   2  * \file points.c
   3  * Point operations.
   4  */
   5
   6 /*
   7  * Mesa 3-D graphics library
   8  * Version:  7.0
   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    ctx->Point._Size = CLAMP(ctx->Point.Size,
  61                             ctx->Point.MinSize,
  62                             ctx->Point.MaxSize);
  63
  64    if (ctx->Driver.PointSize)
  65       ctx->Driver.PointSize(ctx, size);
  66 }
  67
  68
  69 #if _HAVE_FULL_GL
  70
  71 /*
  72  * Added by GL_NV_point_sprite
  73  */
  74 void GLAPIENTRY
  75 _mesa_PointParameteriNV( GLenum pname, GLint param )
  76 {
  77    const GLfloat value = (GLfloat) param;
  78    _mesa_PointParameterfvEXT(pname, &value);
  79 }
  80
  81
  82 /*
  83  * Added by GL_NV_point_sprite
  84  */
  85 void GLAPIENTRY
  86 _mesa_PointParameterivNV( GLenum pname, const GLint *params )
  87 {
  88    const GLfloat value = (GLfloat) params[0];
  89    _mesa_PointParameterfvEXT(pname, &value);
  90 }
  91
  92
  93
  94 /*
  95  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
  96  */
  97 void GLAPIENTRY
  98 _mesa_PointParameterfEXT( GLenum pname, GLfloat param)
  99 {
 100    _mesa_PointParameterfvEXT(pname, &param);
 101 }
 102
 103
 104
 105 /*
 106  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
 107  */
 108 void GLAPIENTRY
 109 _mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params)
 110 {
 111    GET_CURRENT_CONTEXT(ctx);
 112    ASSERT_OUTSIDE_BEGIN_END(ctx);
 113
 114    switch (pname) {
 115       case GL_DISTANCE_ATTENUATION_EXT:
 116          if (ctx->Extensions.EXT_point_parameters) {
 117             if (TEST_EQ_3V(ctx->Point.Params, params))
 118                return;
 119             FLUSH_VERTICES(ctx, _NEW_POINT);
 120             COPY_3V(ctx->Point.Params, params);
 121             ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
 122                                       ctx->Point.Params[1] != 0.0 ||
 123                                       ctx->Point.Params[2] != 0.0);
 124          }
 125          else {
 126             _mesa_error(ctx, GL_INVALID_ENUM,
 127                         "glPointParameterf[v]{EXT,ARB}(pname)");
 128             return;
 129          }
 130          break;
 131       case GL_POINT_SIZE_MIN_EXT:
 132          if (ctx->Extensions.EXT_point_parameters) {
 133             if (params[0] < 0.0F) {
 134                _mesa_error( ctx, GL_INVALID_VALUE,
 135                             "glPointParameterf[v]{EXT,ARB}(param)" );
 136                return;
 137             }
 138             if (ctx->Point.MinSize == params[0])
 139                return;
 140             FLUSH_VERTICES(ctx, _NEW_POINT);
 141             ctx->Point.MinSize = params[0];
 142          }
 143          else {
 144             _mesa_error(ctx, GL_INVALID_ENUM,
 145                         "glPointParameterf[v]{EXT,ARB}(pname)");
 146             return;
 147          }
 148          break;
 149       case GL_POINT_SIZE_MAX_EXT:
 150          if (ctx->Extensions.EXT_point_parameters) {
 151             if (params[0] < 0.0F) {
 152                _mesa_error( ctx, GL_INVALID_VALUE,
 153                             "glPointParameterf[v]{EXT,ARB}(param)" );
 154                return;
 155             }
 156             if (ctx->Point.MaxSize == params[0])
 157                return;
 158             FLUSH_VERTICES(ctx, _NEW_POINT);
 159             ctx->Point.MaxSize = params[0];
 160          }
 161          else {
 162             _mesa_error(ctx, GL_INVALID_ENUM,
 163                         "glPointParameterf[v]{EXT,ARB}(pname)");
 164             return;
 165          }
 166          break;
 167       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 168          if (ctx->Extensions.EXT_point_parameters) {
 169             if (params[0] < 0.0F) {
 170                _mesa_error( ctx, GL_INVALID_VALUE,
 171                             "glPointParameterf[v]{EXT,ARB}(param)" );
 172                return;
 173             }
 174             if (ctx->Point.Threshold == params[0])
 175                return;
 176             FLUSH_VERTICES(ctx, _NEW_POINT);
 177             ctx->Point.Threshold = params[0];
 178          }
 179          else {
 180             _mesa_error(ctx, GL_INVALID_ENUM,
 181                         "glPointParameterf[v]{EXT,ARB}(pname)");
 182             return;
 183          }
 184          break;
 185       case GL_POINT_SPRITE_R_MODE_NV:
 186          /* This is one area where ARB_point_sprite and NV_point_sprite
 187           * differ.  In ARB_point_sprite the POINT_SPRITE_R_MODE is
 188           * always ZERO.  NV_point_sprite adds the S and R modes.
 189           */
 190          if (ctx->Extensions.NV_point_sprite) {
 191             GLenum value = (GLenum) params[0];
 192             if (value != GL_ZERO && value != GL_S && value != GL_R) {
 193                _mesa_error(ctx, GL_INVALID_VALUE,
 194                            "glPointParameterf[v]{EXT,ARB}(param)");
 195                return;
 196             }
 197             if (ctx->Point.SpriteRMode == value)
 198                return;
 199             FLUSH_VERTICES(ctx, _NEW_POINT);
 200             ctx->Point.SpriteRMode = value;
 201          }
 202          else {
 203             _mesa_error(ctx, GL_INVALID_ENUM,
 204                         "glPointParameterf[v]{EXT,ARB}(pname)");
 205             return;
 206          }
 207          break;
 208       case GL_POINT_SPRITE_COORD_ORIGIN:
 209          if (ctx->Extensions.ARB_point_sprite) {
 210             GLenum value = (GLenum) params[0];
 211             if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) {
 212                _mesa_error(ctx, GL_INVALID_VALUE,
 213                            "glPointParameterf[v]{EXT,ARB}(param)");
 214                return;
 215             }
 216             if (ctx->Point.SpriteOrigin == value)
 217                return;
 218             FLUSH_VERTICES(ctx, _NEW_POINT);
 219             ctx->Point.SpriteOrigin = value;
 220          }
 221          else {
 222             _mesa_error(ctx, GL_INVALID_ENUM,
 223                         "glPointParameterf[v]{EXT,ARB}(pname)");
 224             return;
 225          }
 226          break;
 227       default:
 228          _mesa_error( ctx, GL_INVALID_ENUM,
 229                       "glPointParameterf[v]{EXT,ARB}(pname)" );
 230          return;
 231    }
 232
 233    if (ctx->Driver.PointParameterfv)
 234       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 235 }
 236 #endif
 237
 238
 239
 240 /**
 241  * Initialize the context point state.
 242  *
 243  * \param ctx GL context.
 244  *
 245  * Initializes __GLcontextRec::Point and point related constants in
 246  * __GLcontextRec::Const.
 247  */
 248 void
 249 _mesa_init_point(GLcontext *ctx)
 250 {
 251    GLuint i;
 252
 253    ctx->Point.SmoothFlag = GL_FALSE;
 254    ctx->Point.Size = 1.0;
 255    ctx->Point._Size = 1.0;
 256    ctx->Point.Params[0] = 1.0;
 257    ctx->Point.Params[1] = 0.0;
 258    ctx->Point.Params[2] = 0.0;
 259    ctx->Point._Attenuated = GL_FALSE;
 260    ctx->Point.MinSize = 0.0;
 261    ctx->Point.MaxSize
 262       = MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA);
 263    ctx->Point.Threshold = 1.0;
 264    ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */
 265    ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */
 266    ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */
 267    for (i = 0; i < MAX_TEXTURE_UNITS; i++) {
 268       ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */
 269    }
 270 }