src/mesa/main/hint.c

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  4.1
   5  *
   6  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 #include "glheader.h"
  28 #include "enums.h"
  29 #include "context.h"
  30 #include "hint.h"
  31 #include "imports.h"
  32 #include "mtypes.h"
  33
  34
  35
  36 void GLAPIENTRY
  37 _mesa_Hint( GLenum target, GLenum mode )
  38 {
  39    GET_CURRENT_CONTEXT(ctx);
  40    ASSERT_OUTSIDE_BEGIN_END(ctx);
  41
  42    if (MESA_VERBOSE & VERBOSE_API)
  43       _mesa_debug(ctx, "glHint %s %d\n",
  44                   _mesa_lookup_enum_by_nr(target), mode);
  45
  46    if (mode != GL_NICEST && mode != GL_FASTEST && mode != GL_DONT_CARE) {
  47       _mesa_error(ctx, GL_INVALID_ENUM, "glHint(mode)");
  48       return;
  49    }
  50
  51    switch (target) {
  52       case GL_FOG_HINT:
  53          if (ctx->Hint.Fog == mode)
  54             return;
  55          FLUSH_VERTICES(ctx, _NEW_HINT);
  56          ctx->Hint.Fog = mode;
  57          break;
  58       case GL_LINE_SMOOTH_HINT:
  59          if (ctx->Hint.LineSmooth == mode)
  60             return;
  61          FLUSH_VERTICES(ctx, _NEW_HINT);
  62          ctx->Hint.LineSmooth = mode;
  63          break;
  64       case GL_PERSPECTIVE_CORRECTION_HINT:
  65          if (ctx->Hint.PerspectiveCorrection == mode)
  66             return;
  67          FLUSH_VERTICES(ctx, _NEW_HINT);
  68          ctx->Hint.PerspectiveCorrection = mode;
  69          break;
  70       case GL_POINT_SMOOTH_HINT:
  71          if (ctx->Hint.PointSmooth == mode)
  72             return;
  73          FLUSH_VERTICES(ctx, _NEW_HINT);
  74          ctx->Hint.PointSmooth = mode;
  75          break;
  76       case GL_POLYGON_SMOOTH_HINT:
  77          if (ctx->Hint.PolygonSmooth == mode)
  78             return;
  79          FLUSH_VERTICES(ctx, _NEW_HINT);
  80          ctx->Hint.PolygonSmooth = mode;
  81          break;
  82
  83       /* GL_EXT_clip_volume_hint */
  84       case GL_CLIP_VOLUME_CLIPPING_HINT_EXT:
  85          if (ctx->Hint.ClipVolumeClipping == mode)
  86             return;
  87          FLUSH_VERTICES(ctx, _NEW_HINT);
  88          ctx->Hint.ClipVolumeClipping = mode;
  89          break;
  90
  91       /* GL_ARB_texture_compression */
  92       case GL_TEXTURE_COMPRESSION_HINT_ARB:
  93          if (ctx->Hint.TextureCompression == mode)
  94             return;
  95          FLUSH_VERTICES(ctx, _NEW_HINT);
  96          ctx->Hint.TextureCompression = mode;
  97          break;
  98
  99       /* GL_SGIS_generate_mipmap */
 100       case GL_GENERATE_MIPMAP_HINT_SGIS:
 101          if (ctx->Hint.GenerateMipmap == mode)
 102             return;
 103          FLUSH_VERTICES(ctx, _NEW_HINT);
 104          ctx->Hint.GenerateMipmap = mode;
 105          break;
 106
 107       /* GL_ARB_fragment_shader */
 108       case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_ARB:
 109          if (!ctx->Extensions.ARB_fragment_shader) {
 110             _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
 111             return;
 112          }
 113          if (ctx->Hint.FragmentShaderDerivative == mode)
 114             return;
 115          FLUSH_VERTICES(ctx, _NEW_HINT);
 116          ctx->Hint.FragmentShaderDerivative = mode;
 117          break;
 118
 119       default:
 120          _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
 121          return;
 122    }
 123
 124    if (ctx->Driver.Hint) {
 125       (*ctx->Driver.Hint)( ctx, target, mode );
 126    }
 127 }
 128
 129
 130 /**********************************************************************/
 131 /*****                      Initialization                        *****/
 132 /**********************************************************************/
 133
 134 void _mesa_init_hint( struct gl_context * ctx )
 135 {
 136    /* Hint group */
 137    ctx->Hint.PerspectiveCorrection = GL_DONT_CARE;
 138    ctx->Hint.PointSmooth = GL_DONT_CARE;
 139    ctx->Hint.LineSmooth = GL_DONT_CARE;
 140    ctx->Hint.PolygonSmooth = GL_DONT_CARE;
 141    ctx->Hint.Fog = GL_DONT_CARE;
 142    ctx->Hint.ClipVolumeClipping = GL_DONT_CARE;
 143    ctx->Hint.TextureCompression = GL_DONT_CARE;
 144    ctx->Hint.GenerateMipmap = GL_DONT_CARE;
 145    ctx->Hint.FragmentShaderDerivative = GL_DONT_CARE;
 146 }