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->API != API_OPENGL && ctx->API != API_OPENGLES)
  55             goto invalid_target;
  56          if (ctx->Hint.Fog == mode)
  57             return;
  58          FLUSH_VERTICES(ctx, _NEW_HINT);
  59          ctx->Hint.Fog = mode;
  60          break;
  61       case GL_LINE_SMOOTH_HINT:
  62          if (!_mesa_is_desktop_gl(ctx) && ctx->API != API_OPENGLES)
  63             goto invalid_target;
  64          if (ctx->Hint.LineSmooth == mode)
  65             return;
  66          FLUSH_VERTICES(ctx, _NEW_HINT);
  67          ctx->Hint.LineSmooth = mode;
  68          break;
  69       case GL_PERSPECTIVE_CORRECTION_HINT:
  70          if (ctx->API != API_OPENGL && ctx->API != API_OPENGLES)
  71             goto invalid_target;
  72          if (ctx->Hint.PerspectiveCorrection == mode)
  73             return;
  74          FLUSH_VERTICES(ctx, _NEW_HINT);
  75          ctx->Hint.PerspectiveCorrection = mode;
  76          break;
  77       case GL_POINT_SMOOTH_HINT:
  78          if (ctx->API != API_OPENGL && ctx->API != API_OPENGLES)
  79             goto invalid_target;
  80          if (ctx->Hint.PointSmooth == mode)
  81             return;
  82          FLUSH_VERTICES(ctx, _NEW_HINT);
  83          ctx->Hint.PointSmooth = mode;
  84          break;
  85       case GL_POLYGON_SMOOTH_HINT:
  86          if (!_mesa_is_desktop_gl(ctx))
  87             goto invalid_target;
  88          if (ctx->Hint.PolygonSmooth == mode)
  89             return;
  90          FLUSH_VERTICES(ctx, _NEW_HINT);
  91          ctx->Hint.PolygonSmooth = mode;
  92          break;
  93
  94       /* GL_EXT_clip_volume_hint */
  95       case GL_CLIP_VOLUME_CLIPPING_HINT_EXT:
  96          if (ctx->API != API_OPENGL)
  97             goto invalid_target;
  98          if (ctx->Hint.ClipVolumeClipping == mode)
  99             return;
 100          FLUSH_VERTICES(ctx, _NEW_HINT);
 101          ctx->Hint.ClipVolumeClipping = mode;
 102          break;
 103
 104       /* GL_ARB_texture_compression */
 105       case GL_TEXTURE_COMPRESSION_HINT_ARB:
 106          if (!_mesa_is_desktop_gl(ctx))
 107             goto invalid_target;
 108          if (ctx->Hint.TextureCompression == mode)
 109             return;
 110          FLUSH_VERTICES(ctx, _NEW_HINT);
 111          ctx->Hint.TextureCompression = mode;
 112          break;
 113
 114       /* GL_SGIS_generate_mipmap */
 115       case GL_GENERATE_MIPMAP_HINT_SGIS:
 116          if (ctx->API == API_OPENGL_CORE)
 117             goto invalid_target;
 118          if (ctx->Hint.GenerateMipmap == mode)
 119             return;
 120          FLUSH_VERTICES(ctx, _NEW_HINT);
 121          ctx->Hint.GenerateMipmap = mode;
 122          break;
 123
 124       /* GL_ARB_fragment_shader */
 125       case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_ARB:
 126          if (ctx->API == API_OPENGLES || !ctx->Extensions.ARB_fragment_shader)
 127             goto invalid_target;
 128          if (ctx->Hint.FragmentShaderDerivative == mode)
 129             return;
 130          FLUSH_VERTICES(ctx, _NEW_HINT);
 131          ctx->Hint.FragmentShaderDerivative = mode;
 132          break;
 133
 134       default:
 135          goto invalid_target;
 136    }
 137
 138    if (ctx->Driver.Hint) {
 139       (*ctx->Driver.Hint)( ctx, target, mode );
 140    }
 141
 142    return;
 143
 144 invalid_target:
 145    _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
 146    return;
 147 }
 148
 149
 150 /**********************************************************************/
 151 /*****                      Initialization                        *****/
 152 /**********************************************************************/
 153
 154 void _mesa_init_hint( struct gl_context * ctx )
 155 {
 156    /* Hint group */
 157    ctx->Hint.PerspectiveCorrection = GL_DONT_CARE;
 158    ctx->Hint.PointSmooth = GL_DONT_CARE;
 159    ctx->Hint.LineSmooth = GL_DONT_CARE;
 160    ctx->Hint.PolygonSmooth = GL_DONT_CARE;
 161    ctx->Hint.Fog = GL_DONT_CARE;
 162    ctx->Hint.ClipVolumeClipping = GL_DONT_CARE;
 163    ctx->Hint.TextureCompression = GL_DONT_CARE;
 164    ctx->Hint.GenerateMipmap = GL_DONT_CARE;
 165    ctx->Hint.FragmentShaderDerivative = GL_DONT_CARE;
 166 }