1 
2 /*
3  * Mesa 3-D graphics library
4  *
5  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
6  *
7  * Permission is hereby granted, free of charge, to any person obtaining a
8  * copy of this software and associated documentation files (the "Software"),
9  * to deal in the Software without restriction, including without limitation
10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11  * and/or sell copies of the Software, and to permit persons to whom the
12  * Software is furnished to do so, subject to the following conditions:
13  *
14  * The above copyright notice and this permission notice shall be included
15  * in all copies or substantial portions of the Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23  * 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
37 _mesa_Hint( GLenum target, GLenum mode )
38 {
39    GET_CURRENT_CONTEXT(ctx);
40 
41    if (MESA_VERBOSE & VERBOSE_API)
42       _mesa_debug(ctx, "glHint %s %s\n",
43                   _mesa_enum_to_string(target),
44                   _mesa_enum_to_string(mode));
45 
46    if (mode != GL_NICEST && mode != GL_FASTEST && mode != GL_DONT_CARE) {
47       _mesa_error(ctx, GL_INVALID_ENUM, "glHint(mode)");
48       return;
49    }
50 
51    switch (target) {
52       case GL_FOG_HINT:
53          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
54             goto invalid_target;
55          if (ctx->Hint.Fog == mode)
56 	    return;
57 	 FLUSH_VERTICES(ctx, _NEW_HINT);
58          ctx->Hint.Fog = mode;
59          break;
60       case GL_LINE_SMOOTH_HINT:
61          if (!_mesa_is_desktop_gl(ctx) && ctx->API != API_OPENGLES)
62             goto invalid_target;
63          if (ctx->Hint.LineSmooth == mode)
64 	    return;
65 	 FLUSH_VERTICES(ctx, _NEW_HINT);
66          ctx->Hint.LineSmooth = mode;
67          break;
68       case GL_PERSPECTIVE_CORRECTION_HINT:
69          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
70             goto invalid_target;
71          if (ctx->Hint.PerspectiveCorrection == mode)
72 	    return;
73 	 FLUSH_VERTICES(ctx, _NEW_HINT);
74          ctx->Hint.PerspectiveCorrection = mode;
75          break;
76       case GL_POINT_SMOOTH_HINT:
77          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
78             goto invalid_target;
79          if (ctx->Hint.PointSmooth == mode)
80 	    return;
81 	 FLUSH_VERTICES(ctx, _NEW_HINT);
82          ctx->Hint.PointSmooth = mode;
83          break;
84       case GL_POLYGON_SMOOTH_HINT:
85          if (!_mesa_is_desktop_gl(ctx))
86             goto invalid_target;
87          if (ctx->Hint.PolygonSmooth == mode)
88 	    return;
89 	 FLUSH_VERTICES(ctx, _NEW_HINT);
90          ctx->Hint.PolygonSmooth = mode;
91          break;
92 
93       /* GL_ARB_texture_compression */
94       case GL_TEXTURE_COMPRESSION_HINT_ARB:
95          if (!_mesa_is_desktop_gl(ctx))
96             goto invalid_target;
97 	 if (ctx->Hint.TextureCompression == mode)
98 	    return;
99 	 FLUSH_VERTICES(ctx, _NEW_HINT);
100 	 ctx->Hint.TextureCompression = mode;
101          break;
102 
103       /* GL_SGIS_generate_mipmap */
104       case GL_GENERATE_MIPMAP_HINT_SGIS:
105          if (ctx->API == API_OPENGL_CORE)
106             goto invalid_target;
107          if (ctx->Hint.GenerateMipmap == mode)
108             return;
109 	 FLUSH_VERTICES(ctx, _NEW_HINT);
110 	 ctx->Hint.GenerateMipmap = mode;
111          break;
112 
113       /* GL_ARB_fragment_shader */
114       case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_ARB:
115          if (ctx->API == API_OPENGLES || !ctx->Extensions.ARB_fragment_shader)
116             goto invalid_target;
117          if (ctx->Hint.FragmentShaderDerivative == mode)
118             return;
119          FLUSH_VERTICES(ctx, _NEW_HINT);
120          ctx->Hint.FragmentShaderDerivative = mode;
121          break;
122 
123       default:
124          goto invalid_target;
125    }
126    return;
127 
128 invalid_target:
129    _mesa_error(ctx, GL_INVALID_ENUM, "glHint(target)");
130    return;
131 }
132 
133 
134 /**********************************************************************/
135 /*****                      Initialization                        *****/
136 /**********************************************************************/
137 
138 void _mesa_init_hint( struct gl_context * ctx )
139 {
140    /* Hint group */
141    ctx->Hint.PerspectiveCorrection = GL_DONT_CARE;
142    ctx->Hint.PointSmooth = GL_DONT_CARE;
143    ctx->Hint.LineSmooth = GL_DONT_CARE;
144    ctx->Hint.PolygonSmooth = GL_DONT_CARE;
145    ctx->Hint.Fog = 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