hint.c revision 7117f1b4 
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->Extensions.ARB_texture_compression) {
93            _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
94	    return;
95         }
96	 if (ctx->Hint.TextureCompression == mode)
97	    return;
98	 FLUSH_VERTICES(ctx, _NEW_HINT);
99	 ctx->Hint.TextureCompression = mode;
100         break;
101
102      /* GL_SGIS_generate_mipmap */
103      case GL_GENERATE_MIPMAP_HINT_SGIS:
104         if (!ctx->Extensions.SGIS_generate_mipmap) {
105            _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
106	    return;
107         }
108         if (ctx->Hint.GenerateMipmap == mode)
109            return;
110	 FLUSH_VERTICES(ctx, _NEW_HINT);
111	 ctx->Hint.GenerateMipmap = mode;
112         break;
113
114      /* GL_ARB_fragment_shader */
115      case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_ARB:
116         if (!ctx->Extensions.ARB_fragment_shader) {
117            _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
118            return;
119         }
120         if (ctx->Hint.FragmentShaderDerivative == mode)
121            return;
122         FLUSH_VERTICES(ctx, _NEW_HINT);
123         ctx->Hint.FragmentShaderDerivative = mode;
124         break;
125
126      default:
127         _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
128         return;
129   }
130
131   if (ctx->Driver.Hint) {
132      (*ctx->Driver.Hint)( ctx, target, mode );
133   }
134}
135
136
137/**********************************************************************/
138/*****                      Initialization                        *****/
139/**********************************************************************/
140
141void _mesa_init_hint( GLcontext * ctx )
142{
143   /* Hint group */
144   ctx->Hint.PerspectiveCorrection = GL_DONT_CARE;
145   ctx->Hint.PointSmooth = GL_DONT_CARE;
146   ctx->Hint.LineSmooth = GL_DONT_CARE;
147   ctx->Hint.PolygonSmooth = GL_DONT_CARE;
148   ctx->Hint.Fog = GL_DONT_CARE;
149   ctx->Hint.ClipVolumeClipping = GL_DONT_CARE;
150   ctx->Hint.TextureCompression = GL_DONT_CARE;
151   ctx->Hint.GenerateMipmap = GL_DONT_CARE;
152   ctx->Hint.FragmentShaderDerivative = GL_DONT_CARE;
153}
154