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->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
144invalid_target:
145   _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
146   return;
147}
148
149
150/**********************************************************************/
151/*****                      Initialization                        *****/
152/**********************************************************************/
153
154void _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}
167