hint.c revision 2634e92dc0cecc364984bef9169a91bb96bafdcd 
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
36void 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
135void _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}
148