1 /* $Id: fog.c,v 1.35 2001/05/30 14:43:17 brianp Exp $ */
4 * Mesa 3-D graphics library
7 * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
41 _mesa_Fogf(GLenum pname
, GLfloat param
)
43 _mesa_Fogfv(pname
, ¶m
);
48 _mesa_Fogi(GLenum pname
, GLint param
)
50 GLfloat fparam
= (GLfloat
) param
;
51 _mesa_Fogfv(pname
, &fparam
);
56 _mesa_Fogiv(GLenum pname
, const GLint
*params
)
65 case GL_FOG_COORDINATE_SOURCE_EXT
:
66 p
[0] = (GLfloat
) *params
;
69 p
[0] = INT_TO_FLOAT( params
[0] );
70 p
[1] = INT_TO_FLOAT( params
[1] );
71 p
[2] = INT_TO_FLOAT( params
[2] );
72 p
[3] = INT_TO_FLOAT( params
[3] );
75 /* Error will be caught later in _mesa_Fogfv */
78 _mesa_Fogfv(pname
, p
);
83 _mesa_Fogfv( GLenum pname
, const GLfloat
*params
)
85 GET_CURRENT_CONTEXT(ctx
);
87 ASSERT_OUTSIDE_BEGIN_END(ctx
);
91 m
= (GLenum
) (GLint
) *params
;
98 _mesa_error( ctx
, GL_INVALID_ENUM
, "glFog" );
101 if (ctx
->Fog
.Mode
== m
)
103 FLUSH_VERTICES(ctx
, _NEW_FOG
);
108 _mesa_error( ctx
, GL_INVALID_VALUE
, "glFog" );
111 if (ctx
->Fog
.Density
== *params
)
113 FLUSH_VERTICES(ctx
, _NEW_FOG
);
114 ctx
->Fog
.Density
= *params
;
117 if (ctx
->Fog
.Start
== *params
)
119 FLUSH_VERTICES(ctx
, _NEW_FOG
);
120 ctx
->Fog
.Start
= *params
;
123 if (ctx
->Fog
.End
== *params
)
125 FLUSH_VERTICES(ctx
, _NEW_FOG
);
126 ctx
->Fog
.End
= *params
;
129 if (ctx
->Fog
.Index
== *params
)
131 FLUSH_VERTICES(ctx
, _NEW_FOG
);
132 ctx
->Fog
.Index
= *params
;
135 if (TEST_EQ_4V(ctx
->Fog
.Color
, params
))
137 FLUSH_VERTICES(ctx
, _NEW_FOG
);
138 ctx
->Fog
.Color
[0] = params
[0];
139 ctx
->Fog
.Color
[1] = params
[1];
140 ctx
->Fog
.Color
[2] = params
[2];
141 ctx
->Fog
.Color
[3] = params
[3];
143 case GL_FOG_COORDINATE_SOURCE_EXT
: {
144 GLenum p
= (GLenum
) (GLint
) *params
;
145 if (!ctx
->Extensions
.EXT_fog_coord
||
146 (p
!= GL_FOG_COORDINATE_EXT
&& p
!= GL_FRAGMENT_DEPTH_EXT
)) {
147 _mesa_error(ctx
, GL_INVALID_ENUM
, "glFog");
150 if (ctx
->Fog
.FogCoordinateSource
== p
)
152 FLUSH_VERTICES(ctx
, _NEW_FOG
);
153 ctx
->Fog
.FogCoordinateSource
= p
;
157 _mesa_error( ctx
, GL_INVALID_ENUM
, "glFog" );
161 if (ctx
->Driver
.Fogfv
) {
162 (*ctx
->Driver
.Fogfv
)( ctx
, pname
, params
);