reactos/dll/opengl/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 #include <precomp.h>
  31
  32 /**
  33  * Set current point size.
  34  * \param size  point diameter in pixels
  35  * \sa glPointSize().
  36  */
  37 void GLAPIENTRY
  38 _mesa_PointSize( GLfloat size )
  39 {
  40    GET_CURRENT_CONTEXT(ctx);
  41    ASSERT_OUTSIDE_BEGIN_END(ctx);
  42
  43    if (size <= 0.0) {
  44       _mesa_error( ctx, GL_INVALID_VALUE, "glPointSize" );
  45       return;
  46    }
  47
  48    if (ctx->Point.Size == size)
  49       return;
  50
  51    FLUSH_VERTICES(ctx, _NEW_POINT);
  52    ctx->Point.Size = size;
  53
  54    if (ctx->Driver.PointSize)
  55       ctx->Driver.PointSize(ctx, size);
  56 }
  57
  58
  59 #if _HAVE_FULL_GL
  60
  61
  62 void GLAPIENTRY
  63 _mesa_PointParameteri( GLenum pname, GLint param )
  64 {
  65    GLfloat p[3];
  66    p[0] = (GLfloat) param;
  67    p[1] = p[2] = 0.0F;
  68    _mesa_PointParameterfv(pname, p);
  69 }
  70
  71
  72 void GLAPIENTRY
  73 _mesa_PointParameteriv( GLenum pname, const GLint *params )
  74 {
  75    GLfloat p[3];
  76    p[0] = (GLfloat) params[0];
  77    if (pname == GL_DISTANCE_ATTENUATION_EXT) {
  78       p[1] = (GLfloat) params[1];
  79       p[2] = (GLfloat) params[2];
  80    }
  81    _mesa_PointParameterfv(pname, p);
  82 }
  83
  84
  85 void GLAPIENTRY
  86 _mesa_PointParameterf( GLenum pname, GLfloat param)
  87 {
  88    GLfloat p[3];
  89    p[0] = param;
  90    p[1] = p[2] = 0.0F;
  91    _mesa_PointParameterfv(pname, p);
  92 }
  93
  94
  95 void GLAPIENTRY
  96 _mesa_PointParameterfv( GLenum pname, const GLfloat *params)
  97 {
  98    GET_CURRENT_CONTEXT(ctx);
  99    ASSERT_OUTSIDE_BEGIN_END(ctx);
 100
 101    switch (pname) {
 102       case GL_DISTANCE_ATTENUATION_EXT:
 103          if (ctx->Extensions.EXT_point_parameters) {
 104             if (TEST_EQ_3V(ctx->Point.Params, params))
 105                return;
 106             FLUSH_VERTICES(ctx, _NEW_POINT);
 107             COPY_3V(ctx->Point.Params, params);
 108             ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
 109                                       ctx->Point.Params[1] != 0.0 ||
 110                                       ctx->Point.Params[2] != 0.0);
 111
 112             if (ctx->Point._Attenuated)
 113                ctx->_TriangleCaps |= DD_POINT_ATTEN;
 114             else
 115                ctx->_TriangleCaps &= ~DD_POINT_ATTEN;
 116          }
 117          else {
 118             _mesa_error(ctx, GL_INVALID_ENUM,
 119                         "glPointParameterf[v]{EXT,ARB}(pname)");
 120             return;
 121          }
 122          break;
 123       case GL_POINT_SIZE_MIN_EXT:
 124          if (ctx->Extensions.EXT_point_parameters) {
 125             if (params[0] < 0.0F) {
 126                _mesa_error( ctx, GL_INVALID_VALUE,
 127                             "glPointParameterf[v]{EXT,ARB}(param)" );
 128                return;
 129             }
 130             if (ctx->Point.MinSize == params[0])
 131                return;
 132             FLUSH_VERTICES(ctx, _NEW_POINT);
 133             ctx->Point.MinSize = params[0];
 134          }
 135          else {
 136             _mesa_error(ctx, GL_INVALID_ENUM,
 137                         "glPointParameterf[v]{EXT,ARB}(pname)");
 138             return;
 139          }
 140          break;
 141       case GL_POINT_SIZE_MAX_EXT:
 142          if (ctx->Extensions.EXT_point_parameters) {
 143             if (params[0] < 0.0F) {
 144                _mesa_error( ctx, GL_INVALID_VALUE,
 145                             "glPointParameterf[v]{EXT,ARB}(param)" );
 146                return;
 147             }
 148             if (ctx->Point.MaxSize == params[0])
 149                return;
 150             FLUSH_VERTICES(ctx, _NEW_POINT);
 151             ctx->Point.MaxSize = params[0];
 152          }
 153          else {
 154             _mesa_error(ctx, GL_INVALID_ENUM,
 155                         "glPointParameterf[v]{EXT,ARB}(pname)");
 156             return;
 157          }
 158          break;
 159       case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
 160          if (ctx->Extensions.EXT_point_parameters) {
 161             if (params[0] < 0.0F) {
 162                _mesa_error( ctx, GL_INVALID_VALUE,
 163                             "glPointParameterf[v]{EXT,ARB}(param)" );
 164                return;
 165             }
 166             if (ctx->Point.Threshold == params[0])
 167                return;
 168             FLUSH_VERTICES(ctx, _NEW_POINT);
 169             ctx->Point.Threshold = params[0];
 170          }
 171          else {
 172             _mesa_error(ctx, GL_INVALID_ENUM,
 173                         "glPointParameterf[v]{EXT,ARB}(pname)");
 174             return;
 175          }
 176          break;
 177       case GL_POINT_SPRITE_R_MODE_NV:
 178          /* This is one area where ARB_point_sprite and NV_point_sprite
 179           * differ.  In ARB_point_sprite the POINT_SPRITE_R_MODE is
 180           * always ZERO.  NV_point_sprite adds the S and R modes.
 181           */
 182          if (ctx->Extensions.NV_point_sprite) {
 183             GLenum value = (GLenum) params[0];
 184             if (value != GL_ZERO && value != GL_S && value != GL_R) {
 185                _mesa_error(ctx, GL_INVALID_VALUE,
 186                            "glPointParameterf[v]{EXT,ARB}(param)");
 187                return;
 188             }
 189             if (ctx->Point.SpriteRMode == value)
 190                return;
 191             FLUSH_VERTICES(ctx, _NEW_POINT);
 192             ctx->Point.SpriteRMode = value;
 193          }
 194          else {
 195             _mesa_error(ctx, GL_INVALID_ENUM,
 196                         "glPointParameterf[v]{EXT,ARB}(pname)");
 197             return;
 198          }
 199          break;
 200       case GL_POINT_SPRITE_COORD_ORIGIN:
 201          /* This is not completely correct.  GL_POINT_SPRITE_COORD_ORIGIN was
 202           * added to point sprites when the extension was merged into OpenGL
 203           * 2.0.  It is expected that an implementation supporting OpenGL 1.4
 204           * and GL_ARB_point_sprite will generate an error here.
 205           */
 206          if (ctx->Extensions.ARB_point_sprite) {
 207             GLenum value = (GLenum) params[0];
 208             if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) {
 209                _mesa_error(ctx, GL_INVALID_VALUE,
 210                            "glPointParameterf[v]{EXT,ARB}(param)");
 211                return;
 212             }
 213             if (ctx->Point.SpriteOrigin == value)
 214                return;
 215             FLUSH_VERTICES(ctx, _NEW_POINT);
 216             ctx->Point.SpriteOrigin = value;
 217          }
 218          else {
 219             _mesa_error(ctx, GL_INVALID_ENUM,
 220                         "glPointParameterf[v]{EXT,ARB}(pname)");
 221             return;
 222          }
 223          break;
 224       default:
 225          _mesa_error( ctx, GL_INVALID_ENUM,
 226                       "glPointParameterf[v]{EXT,ARB}(pname)" );
 227          return;
 228    }
 229
 230    if (ctx->Driver.PointParameterfv)
 231       (*ctx->Driver.PointParameterfv)(ctx, pname, params);
 232 }
 233 #endif
 234
 235
 236
 237 /**
 238  * Initialize the context point state.
 239  *
 240  * \param ctx GL context.
 241  *
 242  * Initializes __struct gl_contextRec::Point and point related constants in
 243  * __struct gl_contextRec::Const.
 244  */
 245 void
 246 _mesa_init_point(struct gl_context *ctx)
 247 {
 248    ctx->Point.SmoothFlag = GL_FALSE;
 249    ctx->Point.Size = 1.0;
 250    ctx->Point.Params[0] = 1.0;
 251    ctx->Point.Params[1] = 0.0;
 252    ctx->Point.Params[2] = 0.0;
 253    ctx->Point._Attenuated = GL_FALSE;
 254    ctx->Point.MinSize = 0.0;
 255    ctx->Point.MaxSize
 256       = MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA);
 257    ctx->Point.Threshold = 1.0;
 258    ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */
 259    ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */
 260    ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */
 261    ctx->Point.CoordReplace = GL_FALSE; /* GL_ARB/NV_point_sprite */
 262 }