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    /* XXX correct clamp limits? */
  61    ctx->Point._Size = CLAMP(ctx->Point.Size,
  62                             ctx->Point.MinSize,
  63                             ctx->Point.MaxSize);
  64
  65    if (ctx->Driver.PointSize)
  66       ctx->Driver.PointSize(ctx, size);
  67 }
  68
  69
  70 #if _HAVE_FULL_GL
  71
  72 /*
  73  * Added by GL_NV_point_sprite
  74  */
  75 void GLAPIENTRY
  76 _mesa_PointParameteriNV( GLenum pname, GLint param )
  77 {
  78    const GLfloat value = (GLfloat) param;
  79    _mesa_PointParameterfvEXT(pname, &value);
  80 }
  81
  82
  83 /*
  84  * Added by GL_NV_point_sprite
  85  */
  86 void GLAPIENTRY
  87 _mesa_PointParameterivNV( GLenum pname, const GLint *params )
  88 {
  89    const GLfloat value = (GLfloat) params[0];
  90    _mesa_PointParameterfvEXT(pname, &value);
  91 }
  92
  93
  94
  95 /*
  96  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
  97  */
  98 void GLAPIENTRY
  99 _mesa_PointParameterfEXT( GLenum pname, GLfloat param)
 100 {
 101    _mesa_PointParameterfvEXT(pname, &param);
 102 }
 103
 104
 105
 106 /*
 107  * Same for both GL_EXT_point_parameters and GL_ARB_point_parameters.
 108  */
 109 void GLAPIENTRY
 110 _mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params)
 111 {
 112    GET_CURRENT_CONTEXT(ctx);
 113    ASSERT_OUTSIDE_BEGIN_END(ctx);
 114
 115    switch (pname) {
 116       case GL_DISTANCE_ATTENUATION_EXT:
 117          if (ctx->Extensions.EXT_point_parameters) {
 118             if (TEST_EQ_3V(ctx->Point.Params, params))
 119                return;
 120             FLUSH_VERTICES(ctx, _NEW_POINT);
 121             COPY_3V(ctx->Point.Params, params);
 122             ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
 123                                       ctx->Point.Params[1] != 0.0 ||
 124                                       ctx->Point.Params[2] != 0.0);
 125          }
 126          else {
 127             _mesa_error(ctx, GL_INVALID_ENUM,
 128                         "glPointParameterf[v]{EXT,ARB}(pname)");
 129             return;
 130          }
 131          break;
 132       case GL_POINT_SIZE_MIN_EXT:
 133          if (ctx->Extensions.EXT_point_parameters) {
 134             if (params[0] < 0.0F) {
 135                _mesa_error( ctx, GL_INVALID_VALUE,
 136                             "glPointParameterf[v]{EXT,ARB}(param)" );
 137                return;
 138             }
 139             if (ctx->Point.MinSize == params[0])
 140                return;
 141             FLUSH_VERTICES(ctx, _NEW_POINT);
 142             ctx->Point.MinSize = params[0];
 143          }
 144          else {
 145             _mesa_error(ctx, GL_INVALID_ENUM,
 146                         "glPointParameterf[v]{EXT,ARB}(pname)");
 147             return;
 148          }
 149          break;
 150       case GL_POINT_SIZE_MAX_EXT:
 151          if (ctx->Extensions.EXT_point_parameters) {
 152             if (params[0] < 0.0F) {
 153                _mesa_error( ctx, GL_INVALID_VALUE,
 154                             "glPointParameterf[v]{EXT,ARB}(param)" );
 155                return;
 156             }
 157             if (ctx->Point.MaxSize == params[0])
 158                return;
 159             FLUSH_VERTICES(ctx, _NEW_POINT);
 160             ctx->Point.MaxSize = params[0];
 161          }
 162          else {
 163             _mesa_error(ctx, GL_INVALID_ENUM,
 164                         "glPointParameterf[v]{EXT,ARB}(pname)");
 165             return;
 166          }
 167          break;
 168       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 169          if (ctx->Extensions.EXT_point_parameters) {
 170             if (params[0] < 0.0F) {
 171                _mesa_error( ctx, GL_INVALID_VALUE,
 172                             "glPointParameterf[v]{EXT,ARB}(param)" );
 173                return;
 174             }
 175             if (ctx->Point.Threshold == params[0])
 176                return;
 177             FLUSH_VERTICES(ctx, _NEW_POINT);
 178             ctx->Point.Threshold = params[0];
 179          }
 180          else {
 181             _mesa_error(ctx, GL_INVALID_ENUM,
 182                         "glPointParameterf[v]{EXT,ARB}(pname)");
 183             return;
 184          }
 185          break;
 186       case GL_POINT_SPRITE_R_MODE_NV:
 187          /* This is one area where ARB_point_sprite and NV_point_sprite
 188           * differ.  In ARB_point_sprite the POINT_SPRITE_R_MODE is
 189           * always ZERO.  NV_point_sprite adds the S and R modes.
 190           */
 191          if (ctx->Extensions.NV_point_sprite) {
 192             GLenum value = (GLenum) params[0];
 193             if (value != GL_ZERO && value != GL_S && value != GL_R) {
 194                _mesa_error(ctx, GL_INVALID_VALUE,
 195                            "glPointParameterf[v]{EXT,ARB}(param)");
 196                return;
 197             }
 198             if (ctx->Point.SpriteRMode == value)
 199                return;
 200             FLUSH_VERTICES(ctx, _NEW_POINT);
 201             ctx->Point.SpriteRMode = value;
 202          }
 203          else {
 204             _mesa_error(ctx, GL_INVALID_ENUM,
 205                         "glPointParameterf[v]{EXT,ARB}(pname)");
 206             return;
 207          }
 208          break;
 209       case GL_POINT_SPRITE_COORD_ORIGIN:
 210          if (ctx->Extensions.ARB_point_sprite) {
 211             GLenum value = (GLenum) params[0];
 212             if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) {
 213                _mesa_error(ctx, GL_INVALID_VALUE,
 214                            "glPointParameterf[v]{EXT,ARB}(param)");
 215                return;
 216             }
 217             if (ctx->Point.SpriteOrigin == value)
 218                return;
 219             FLUSH_VERTICES(ctx, _NEW_POINT);
 220             ctx->Point.SpriteOrigin = value;
 221          }
 222          else {
 223             _mesa_error(ctx, GL_INVALID_ENUM,
 224                         "glPointParameterf[v]{EXT,ARB}(pname)");
 225             return;
 226          }
 227          break;
 228       default:
 229          _mesa_error( ctx, GL_INVALID_ENUM,
 230                       "glPointParameterf[v]{EXT,ARB}(pname)" );
 231          return;
 232    }
 233
 234    if (ctx->Driver.PointParameterfv)
 235       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 236 }
 237 #endif
 238
 239
 240
 241 /**
 242  * Initialize the context point state.
 243  *
 244  * \param ctx GL context.
 245  *
 246  * Initializes __GLcontextRec::Point and point related constants in
 247  * __GLcontextRec::Const.
 248  */
 249 void
 250 _mesa_init_point(GLcontext *ctx)
 251 {
 252    GLuint i;
 253
 254    ctx->Point.SmoothFlag = GL_FALSE;
 255    ctx->Point.Size = 1.0;
 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_UNITS; i++) {
 269       ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */
 270    }
 271 }