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
  33
  34
  35 void GLAPIENTRY
  36 _mesa_Hint( GLenum target, GLenum mode )
  37 {
  38    GET_CURRENT_CONTEXT(ctx);
  39    ASSERT_OUTSIDE_BEGIN_END(ctx);
  40
  41    if (MESA_VERBOSE & VERBOSE_API)
  42       _mesa_debug(ctx, "glHint %s %d\n",
  43                   _mesa_lookup_enum_by_nr(target), mode);
  44
  45    if (mode != GL_NICEST && mode != GL_FASTEST && mode != GL_DONT_CARE) {
  46       _mesa_error(ctx, GL_INVALID_ENUM, "glHint(mode)");
  47       return;
  48    }
  49
  50    switch (target) {
  51       case GL_FOG_HINT:
  52          if (ctx->Hint.Fog == mode)
  53             return;
  54          FLUSH_VERTICES(ctx, _NEW_HINT);
  55          ctx->Hint.Fog = mode;
  56          break;
  57       case GL_LINE_SMOOTH_HINT:
  58          if (ctx->Hint.LineSmooth == mode)
  59             return;
  60          FLUSH_VERTICES(ctx, _NEW_HINT);
  61          ctx->Hint.LineSmooth = mode;
  62          break;
  63       case GL_PERSPECTIVE_CORRECTION_HINT:
  64          if (ctx->Hint.PerspectiveCorrection == mode)
  65             return;
  66          FLUSH_VERTICES(ctx, _NEW_HINT);
  67          ctx->Hint.PerspectiveCorrection = mode;
  68          break;
  69       case GL_POINT_SMOOTH_HINT:
  70          if (ctx->Hint.PointSmooth == mode)
  71             return;
  72          FLUSH_VERTICES(ctx, _NEW_HINT);
  73          ctx->Hint.PointSmooth = mode;
  74          break;
  75       case GL_POLYGON_SMOOTH_HINT:
  76          if (ctx->Hint.PolygonSmooth == mode)
  77             return;
  78          FLUSH_VERTICES(ctx, _NEW_HINT);
  79          ctx->Hint.PolygonSmooth = mode;
  80          break;
  81
  82       /* GL_EXT_clip_volume_hint */
  83       case GL_CLIP_VOLUME_CLIPPING_HINT_EXT:
  84          if (ctx->Hint.ClipVolumeClipping == mode)
  85             return;
  86          FLUSH_VERTICES(ctx, _NEW_HINT);
  87          ctx->Hint.ClipVolumeClipping = mode;
  88          break;
  89
  90       /* GL_ARB_texture_compression */
  91       case GL_TEXTURE_COMPRESSION_HINT_ARB:
  92          if (ctx->Hint.TextureCompression == mode)
  93             return;
  94          FLUSH_VERTICES(ctx, _NEW_HINT);
  95          ctx->Hint.TextureCompression = mode;
  96          break;
  97
  98       /* GL_SGIS_generate_mipmap */
  99       case GL_GENERATE_MIPMAP_HINT_SGIS:
 100          if (ctx->Hint.GenerateMipmap == mode)
 101             return;
 102          FLUSH_VERTICES(ctx, _NEW_HINT);
 103          ctx->Hint.GenerateMipmap = mode;
 104          break;
 105
 106       /* GL_ARB_fragment_shader */
 107       case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_ARB:
 108          if (!ctx->Extensions.ARB_fragment_shader) {
 109             _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
 110             return;
 111          }
 112          if (ctx->Hint.FragmentShaderDerivative == mode)
 113             return;
 114          FLUSH_VERTICES(ctx, _NEW_HINT);
 115          ctx->Hint.FragmentShaderDerivative = mode;
 116          break;
 117
 118       default:
 119          _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
 120          return;
 121    }
 122
 123    if (ctx->Driver.Hint) {
 124       (*ctx->Driver.Hint)( ctx, target, mode );
 125    }
 126 }
 127
 128
 129 /**********************************************************************/
 130 /*****                      Initialization                        *****/
 131 /**********************************************************************/
 132
 133 void _mesa_init_hint( struct gl_context * ctx )
 134 {
 135    /* Hint group */
 136    ctx->Hint.PerspectiveCorrection = GL_DONT_CARE;
 137    ctx->Hint.PointSmooth = GL_DONT_CARE;
 138    ctx->Hint.LineSmooth = GL_DONT_CARE;
 139    ctx->Hint.PolygonSmooth = GL_DONT_CARE;
 140    ctx->Hint.Fog = GL_DONT_CARE;
 141    ctx->Hint.ClipVolumeClipping = GL_DONT_CARE;
 142    ctx->Hint.TextureCompression = GL_DONT_CARE;
 143    ctx->Hint.GenerateMipmap = GL_DONT_CARE;
 144    ctx->Hint.FragmentShaderDerivative = GL_DONT_CARE;
 145 }