hint.c revision 4a49301e 
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
33
34
35void GLAPIENTRY
36_mesa_Hint( GLenum target, GLenum mode )
37{
38   GET_CURRENT_CONTEXT(ctx);
39   ASSERT_OUTSIDE_BEGIN_END(ctx);
40
41   if (MESA_VERBOSE & VERBOSE_API)
42      _mesa_debug(ctx, "glHint %s %d\n",
43                  _mesa_lookup_enum_by_nr(target), mode);
44
45   if (mode != GL_NICEST && mode != GL_FASTEST && mode != GL_DONT_CARE) {
46      _mesa_error(ctx, GL_INVALID_ENUM, "glHint(mode)");
47      return;
48   }
49
50   switch (target) {
51      case GL_FOG_HINT:
52         if (ctx->Hint.Fog == mode)
53	    return;
54	 FLUSH_VERTICES(ctx, _NEW_HINT);
55         ctx->Hint.Fog = mode;
56         break;
57      case GL_LINE_SMOOTH_HINT:
58         if (ctx->Hint.LineSmooth == mode)
59	    return;
60	 FLUSH_VERTICES(ctx, _NEW_HINT);
61         ctx->Hint.LineSmooth = mode;
62         break;
63      case GL_PERSPECTIVE_CORRECTION_HINT:
64         if (ctx->Hint.PerspectiveCorrection == mode)
65	    return;
66	 FLUSH_VERTICES(ctx, _NEW_HINT);
67         ctx->Hint.PerspectiveCorrection = mode;
68         break;
69      case GL_POINT_SMOOTH_HINT:
70         if (ctx->Hint.PointSmooth == mode)
71	    return;
72	 FLUSH_VERTICES(ctx, _NEW_HINT);
73         ctx->Hint.PointSmooth = mode;
74         break;
75      case GL_POLYGON_SMOOTH_HINT:
76         if (ctx->Hint.PolygonSmooth == mode)
77	    return;
78	 FLUSH_VERTICES(ctx, _NEW_HINT);
79         ctx->Hint.PolygonSmooth = mode;
80         break;
81
82      /* GL_EXT_clip_volume_hint */
83      case GL_CLIP_VOLUME_CLIPPING_HINT_EXT:
84         if (ctx->Hint.ClipVolumeClipping == mode)
85	    return;
86	 FLUSH_VERTICES(ctx, _NEW_HINT);
87         ctx->Hint.ClipVolumeClipping = mode;
88         break;
89
90      /* GL_ARB_texture_compression */
91      case GL_TEXTURE_COMPRESSION_HINT_ARB:
92	 if (ctx->Hint.TextureCompression == mode)
93	    return;
94	 FLUSH_VERTICES(ctx, _NEW_HINT);
95	 ctx->Hint.TextureCompression = mode;
96         break;
97
98      /* GL_SGIS_generate_mipmap */
99      case GL_GENERATE_MIPMAP_HINT_SGIS:
100         if (!ctx->Extensions.SGIS_generate_mipmap) {
101            _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
102	    return;
103         }
104         if (ctx->Hint.GenerateMipmap == mode)
105            return;
106	 FLUSH_VERTICES(ctx, _NEW_HINT);
107	 ctx->Hint.GenerateMipmap = mode;
108         break;
109
110      /* GL_ARB_fragment_shader */
111      case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_ARB:
112         if (!ctx->Extensions.ARB_fragment_shader) {
113            _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
114            return;
115         }
116         if (ctx->Hint.FragmentShaderDerivative == mode)
117            return;
118         FLUSH_VERTICES(ctx, _NEW_HINT);
119         ctx->Hint.FragmentShaderDerivative = mode;
120         break;
121
122      default:
123         _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
124         return;
125   }
126
127   if (ctx->Driver.Hint) {
128      (*ctx->Driver.Hint)( ctx, target, mode );
129   }
130}
131
132
133/**********************************************************************/
134/*****                      Initialization                        *****/
135/**********************************************************************/
136
137void _mesa_init_hint( GLcontext * ctx )
138{
139   /* Hint group */
140   ctx->Hint.PerspectiveCorrection = GL_DONT_CARE;
141   ctx->Hint.PointSmooth = GL_DONT_CARE;
142   ctx->Hint.LineSmooth = GL_DONT_CARE;
143   ctx->Hint.PolygonSmooth = GL_DONT_CARE;
144   ctx->Hint.Fog = GL_DONT_CARE;
145   ctx->Hint.ClipVolumeClipping = GL_DONT_CARE;
146   ctx->Hint.TextureCompression = GL_DONT_CARE;
147   ctx->Hint.GenerateMipmap = GL_DONT_CARE;
148   ctx->Hint.FragmentShaderDerivative = GL_DONT_CARE;
149}
150