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
36 void GLAPIENTRY
_mesa_Hint(GLenum target,GLenum mode)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
144 invalid_target:
145 _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
146 return;
147 }
148
149
150 /**********************************************************************/
151 /***** Initialization *****/
152 /**********************************************************************/
153
_mesa_init_hint(struct gl_context * ctx)154 void _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