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  * THE AUTHORS OR COPYRIGHT HOLDERS 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
  41    if (MESA_VERBOSE & VERBOSE_API)
  42       _mesa_debug(ctx, "glHint %s %s\n",
  43                   _mesa_lookup_enum_by_nr(target),
  44                   _mesa_lookup_enum_by_nr(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->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
  54             goto invalid_target;
  55          if (ctx->Hint.Fog == mode)
  56             return;
  57          FLUSH_VERTICES(ctx, _NEW_HINT);
  58          ctx->Hint.Fog = mode;
  59          break;
  60       case GL_LINE_SMOOTH_HINT:
  61          if (!_mesa_is_desktop_gl(ctx) && ctx->API != API_OPENGLES)
  62             goto invalid_target;
  63          if (ctx->Hint.LineSmooth == mode)
  64             return;
  65          FLUSH_VERTICES(ctx, _NEW_HINT);
  66          ctx->Hint.LineSmooth = mode;
  67          break;
  68       case GL_PERSPECTIVE_CORRECTION_HINT:
  69          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
  70             goto invalid_target;
  71          if (ctx->Hint.PerspectiveCorrection == mode)
  72             return;
  73          FLUSH_VERTICES(ctx, _NEW_HINT);
  74          ctx->Hint.PerspectiveCorrection = mode;
  75          break;
  76       case GL_POINT_SMOOTH_HINT:
  77          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
  78             goto invalid_target;
  79          if (ctx->Hint.PointSmooth == mode)
  80             return;
  81          FLUSH_VERTICES(ctx, _NEW_HINT);
  82          ctx->Hint.PointSmooth = mode;
  83          break;
  84       case GL_POLYGON_SMOOTH_HINT:
  85          if (!_mesa_is_desktop_gl(ctx))
  86             goto invalid_target;
  87          if (ctx->Hint.PolygonSmooth == mode)
  88             return;
  89          FLUSH_VERTICES(ctx, _NEW_HINT);
  90          ctx->Hint.PolygonSmooth = mode;
  91          break;
  92
  93       /* GL_EXT_clip_volume_hint */
  94       case GL_CLIP_VOLUME_CLIPPING_HINT_EXT:
  95          if (ctx->API != API_OPENGL_COMPAT)
  96             goto invalid_target;
  97          if (ctx->Hint.ClipVolumeClipping == mode)
  98             return;
  99          FLUSH_VERTICES(ctx, _NEW_HINT);
 100          ctx->Hint.ClipVolumeClipping = mode;
 101          break;
 102
 103       /* GL_ARB_texture_compression */
 104       case GL_TEXTURE_COMPRESSION_HINT_ARB:
 105          if (!_mesa_is_desktop_gl(ctx))
 106             goto invalid_target;
 107          if (ctx->Hint.TextureCompression == mode)
 108             return;
 109          FLUSH_VERTICES(ctx, _NEW_HINT);
 110          ctx->Hint.TextureCompression = mode;
 111          break;
 112
 113       /* GL_SGIS_generate_mipmap */
 114       case GL_GENERATE_MIPMAP_HINT_SGIS:
 115          if (ctx->API == API_OPENGL_CORE)
 116             goto invalid_target;
 117          if (ctx->Hint.GenerateMipmap == mode)
 118             return;
 119          FLUSH_VERTICES(ctx, _NEW_HINT);
 120          ctx->Hint.GenerateMipmap = mode;
 121          break;
 122
 123       /* GL_ARB_fragment_shader */
 124       case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_ARB:
 125          if (ctx->API == API_OPENGLES || !ctx->Extensions.ARB_fragment_shader)
 126             goto invalid_target;
 127          if (ctx->Hint.FragmentShaderDerivative == mode)
 128             return;
 129          FLUSH_VERTICES(ctx, _NEW_HINT);
 130          ctx->Hint.FragmentShaderDerivative = mode;
 131          break;
 132
 133       default:
 134          goto invalid_target;
 135    }
 136
 137    if (ctx->Driver.Hint) {
 138       (*ctx->Driver.Hint)( ctx, target, mode );
 139    }
 140
 141    return;
 142
 143 invalid_target:
 144    _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
 145    return;
 146 }
 147
 148
 149 /**********************************************************************/
 150 /*****                      Initialization                        *****/
 151 /**********************************************************************/
 152
 153 void _mesa_init_hint( struct gl_context * ctx )
 154 {
 155    /* Hint group */
 156    ctx->Hint.PerspectiveCorrection = GL_DONT_CARE;
 157    ctx->Hint.PointSmooth = GL_DONT_CARE;
 158    ctx->Hint.LineSmooth = GL_DONT_CARE;
 159    ctx->Hint.PolygonSmooth = GL_DONT_CARE;
 160    ctx->Hint.Fog = GL_DONT_CARE;
 161    ctx->Hint.ClipVolumeClipping = GL_DONT_CARE;
 162    ctx->Hint.TextureCompression = GL_DONT_CARE;
 163    ctx->Hint.GenerateMipmap = GL_DONT_CARE;
 164    ctx->Hint.FragmentShaderDerivative = GL_DONT_CARE;
 165 }