src/mesa/main/hint.c

   1 /* $Id: hint.c,v 1.11 2002/06/13 04:28:29 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.1
   6  *
   7  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #ifdef PC_HEADER
  29 #include "all.h"
  30 #else
  31 #include "glheader.h"
  32 #include "enums.h"
  33 #include "context.h"
  34 #include "hint.h"
  35 #include "state.h"
  36 #endif
  37
  38
  39
  40 void
  41 _mesa_Hint( GLenum target, GLenum mode )
  42 {
  43    GET_CURRENT_CONTEXT(ctx);
  44    ASSERT_OUTSIDE_BEGIN_END(ctx);
  45    (void) _mesa_try_Hint( ctx, target, mode );
  46 }
  47
  48
  49 GLboolean
  50 _mesa_try_Hint( GLcontext *ctx, GLenum target, GLenum mode )
  51 {
  52    if (MESA_VERBOSE & VERBOSE_API)
  53       _mesa_debug("glHint %s %d\n", _mesa_lookup_enum_by_nr(target), mode);
  54
  55    if (mode != GL_NICEST && mode != GL_FASTEST && mode != GL_DONT_CARE) {
  56       _mesa_error(ctx, GL_INVALID_ENUM, "glHint(mode)");
  57       return GL_FALSE;
  58    }
  59
  60    switch (target) {
  61       case GL_FOG_HINT:
  62          if (ctx->Hint.Fog == mode)
  63             return GL_TRUE;
  64          FLUSH_VERTICES(ctx, _NEW_HINT);
  65          ctx->Hint.Fog = mode;
  66          break;
  67       case GL_LINE_SMOOTH_HINT:
  68          if (ctx->Hint.LineSmooth == mode)
  69             return GL_TRUE;
  70          FLUSH_VERTICES(ctx, _NEW_HINT);
  71          ctx->Hint.LineSmooth = mode;
  72          break;
  73       case GL_PERSPECTIVE_CORRECTION_HINT:
  74          if (ctx->Hint.PerspectiveCorrection == mode)
  75             return GL_TRUE;
  76          FLUSH_VERTICES(ctx, _NEW_HINT);
  77          ctx->Hint.PerspectiveCorrection = mode;
  78          break;
  79       case GL_POINT_SMOOTH_HINT:
  80          if (ctx->Hint.PointSmooth == mode)
  81             return GL_TRUE;
  82          FLUSH_VERTICES(ctx, _NEW_HINT);
  83          ctx->Hint.PointSmooth = mode;
  84          break;
  85       case GL_POLYGON_SMOOTH_HINT:
  86          if (ctx->Hint.PolygonSmooth == mode)
  87             return GL_TRUE;
  88          FLUSH_VERTICES(ctx, _NEW_HINT);
  89          ctx->Hint.PolygonSmooth = mode;
  90          break;
  91
  92       /* GL_EXT_clip_volume_hint */
  93       case GL_CLIP_VOLUME_CLIPPING_HINT_EXT:
  94          if (ctx->Hint.ClipVolumeClipping == mode)
  95             return GL_TRUE;
  96          FLUSH_VERTICES(ctx, _NEW_HINT);
  97          ctx->Hint.ClipVolumeClipping = mode;
  98          break;
  99
 100       /* GL_ARB_texture_compression */
 101       case GL_TEXTURE_COMPRESSION_HINT_ARB:
 102          if (!ctx->Extensions.ARB_texture_compression) {
 103             _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
 104             return GL_FALSE;
 105          }
 106          if (ctx->Hint.TextureCompression == mode)
 107             return GL_TRUE;
 108          FLUSH_VERTICES(ctx, _NEW_HINT);
 109          ctx->Hint.TextureCompression = mode;
 110          break;
 111
 112       /* GL_SGIS_generate_mipmap */
 113       case GL_GENERATE_MIPMAP_HINT_SGIS:
 114          if (!ctx->Extensions.SGIS_generate_mipmap) {
 115             _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
 116             return GL_FALSE;
 117          }
 118          if (ctx->Hint.GenerateMipmap == mode)
 119             return GL_TRUE;
 120          FLUSH_VERTICES(ctx, _NEW_HINT);
 121          ctx->Hint.GenerateMipmap = mode;
 122          break;
 123
 124       default:
 125          _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
 126          return GL_FALSE;
 127    }
 128
 129    if (ctx->Driver.Hint) {
 130       (*ctx->Driver.Hint)( ctx, target, mode );
 131    }
 132
 133    return GL_TRUE;
 134 }