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 %s\n",
  44                   _mesa_lookup_enum_by_nr(target),
  45                   _mesa_lookup_enum_by_nr(mode));
  46
  47    if (mode != GL_NICEST && mode != GL_FASTEST && mode != GL_DONT_CARE) {
  48       _mesa_error(ctx, GL_INVALID_ENUM, "glHint(mode)");
  49       return;
  50    }
  51
  52    switch (target) {
  53       case GL_FOG_HINT:
  54          if (ctx->Hint.Fog == mode)
  55             return;
  56          FLUSH_VERTICES(ctx, _NEW_HINT);
  57          ctx->Hint.Fog = mode;
  58          break;
  59       case GL_LINE_SMOOTH_HINT:
  60          if (ctx->Hint.LineSmooth == mode)
  61             return;
  62          FLUSH_VERTICES(ctx, _NEW_HINT);
  63          ctx->Hint.LineSmooth = mode;
  64          break;
  65       case GL_PERSPECTIVE_CORRECTION_HINT:
  66          if (ctx->Hint.PerspectiveCorrection == mode)
  67             return;
  68          FLUSH_VERTICES(ctx, _NEW_HINT);
  69          ctx->Hint.PerspectiveCorrection = mode;
  70          break;
  71       case GL_POINT_SMOOTH_HINT:
  72          if (ctx->Hint.PointSmooth == mode)
  73             return;
  74          FLUSH_VERTICES(ctx, _NEW_HINT);
  75          ctx->Hint.PointSmooth = mode;
  76          break;
  77       case GL_POLYGON_SMOOTH_HINT:
  78          if (ctx->Hint.PolygonSmooth == mode)
  79             return;
  80          FLUSH_VERTICES(ctx, _NEW_HINT);
  81          ctx->Hint.PolygonSmooth = mode;
  82          break;
  83
  84       /* GL_EXT_clip_volume_hint */
  85       case GL_CLIP_VOLUME_CLIPPING_HINT_EXT:
  86          if (ctx->Hint.ClipVolumeClipping == mode)
  87             return;
  88          FLUSH_VERTICES(ctx, _NEW_HINT);
  89          ctx->Hint.ClipVolumeClipping = mode;
  90          break;
  91
  92       /* GL_ARB_texture_compression */
  93       case GL_TEXTURE_COMPRESSION_HINT_ARB:
  94          if (ctx->Hint.TextureCompression == mode)
  95             return;
  96          FLUSH_VERTICES(ctx, _NEW_HINT);
  97          ctx->Hint.TextureCompression = mode;
  98          break;
  99
 100       /* GL_SGIS_generate_mipmap */
 101       case GL_GENERATE_MIPMAP_HINT_SGIS:
 102          if (ctx->Hint.GenerateMipmap == mode)
 103             return;
 104          FLUSH_VERTICES(ctx, _NEW_HINT);
 105          ctx->Hint.GenerateMipmap = mode;
 106          break;
 107
 108       /* GL_ARB_fragment_shader */
 109       case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_ARB:
 110          if (!ctx->Extensions.ARB_fragment_shader) {
 111             _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
 112             return;
 113          }
 114          if (ctx->Hint.FragmentShaderDerivative == mode)
 115             return;
 116          FLUSH_VERTICES(ctx, _NEW_HINT);
 117          ctx->Hint.FragmentShaderDerivative = mode;
 118          break;
 119
 120       default:
 121          _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
 122          return;
 123    }
 124
 125    if (ctx->Driver.Hint) {
 126       (*ctx->Driver.Hint)( ctx, target, mode );
 127    }
 128 }
 129
 130
 131 /**********************************************************************/
 132 /*****                      Initialization                        *****/
 133 /**********************************************************************/
 134
 135 void _mesa_init_hint( struct gl_context * ctx )
 136 {
 137    /* Hint group */
 138    ctx->Hint.PerspectiveCorrection = GL_DONT_CARE;
 139    ctx->Hint.PointSmooth = GL_DONT_CARE;
 140    ctx->Hint.LineSmooth = GL_DONT_CARE;
 141    ctx->Hint.PolygonSmooth = GL_DONT_CARE;
 142    ctx->Hint.Fog = GL_DONT_CARE;
 143    ctx->Hint.ClipVolumeClipping = GL_DONT_CARE;
 144    ctx->Hint.TextureCompression = GL_DONT_CARE;
 145    ctx->Hint.GenerateMipmap = GL_DONT_CARE;
 146    ctx->Hint.FragmentShaderDerivative = GL_DONT_CARE;
 147 }