2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
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:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
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 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
36 _mesa_Fogf(GLenum pname
, GLfloat param
)
40 fparam
[1] = fparam
[2] = fparam
[3] = 0.0F
;
41 _mesa_Fogfv(pname
, fparam
);
46 _mesa_Fogi(GLenum pname
, GLint param
)
49 fparam
[0] = (GLfloat
) param
;
50 fparam
[1] = fparam
[2] = fparam
[3] = 0.0F
;
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 */
76 ASSIGN_4V(p
, 0.0F
, 0.0F
, 0.0F
, 0.0F
);
78 _mesa_Fogfv(pname
, p
);
82 #define UPDATE_FOG_SCALE(ctx) do {\
83 if (ctx->Fog.End == ctx->Fog.Start)\
84 ctx->Fog._Scale = 1.0f;\
86 ctx->Fog._Scale = 1.0f / (ctx->Fog.End - ctx->Fog.Start);\
91 _mesa_Fogfv( GLenum pname
, const GLfloat
*params
)
93 GET_CURRENT_CONTEXT(ctx
);
95 ASSERT_OUTSIDE_BEGIN_END(ctx
);
99 m
= (GLenum
) (GLint
) *params
;
106 _mesa_error( ctx
, GL_INVALID_ENUM
, "glFog" );
109 if (ctx
->Fog
.Mode
== m
)
111 FLUSH_VERTICES(ctx
, _NEW_FOG
);
116 _mesa_error( ctx
, GL_INVALID_VALUE
, "glFog" );
119 if (ctx
->Fog
.Density
== *params
)
121 FLUSH_VERTICES(ctx
, _NEW_FOG
);
122 ctx
->Fog
.Density
= *params
;
125 if (ctx
->Fog
.Start
== *params
)
127 FLUSH_VERTICES(ctx
, _NEW_FOG
);
128 ctx
->Fog
.Start
= *params
;
129 UPDATE_FOG_SCALE(ctx
);
132 if (ctx
->Fog
.End
== *params
)
134 FLUSH_VERTICES(ctx
, _NEW_FOG
);
135 ctx
->Fog
.End
= *params
;
136 UPDATE_FOG_SCALE(ctx
);
139 if (ctx
->Fog
.Index
== *params
)
141 FLUSH_VERTICES(ctx
, _NEW_FOG
);
142 ctx
->Fog
.Index
= *params
;
145 if (TEST_EQ_4V(ctx
->Fog
.Color
, params
))
147 FLUSH_VERTICES(ctx
, _NEW_FOG
);
148 ctx
->Fog
.Color
[0] = CLAMP(params
[0], 0.0F
, 1.0F
);
149 ctx
->Fog
.Color
[1] = CLAMP(params
[1], 0.0F
, 1.0F
);
150 ctx
->Fog
.Color
[2] = CLAMP(params
[2], 0.0F
, 1.0F
);
151 ctx
->Fog
.Color
[3] = CLAMP(params
[3], 0.0F
, 1.0F
);
153 case GL_FOG_COORDINATE_SOURCE_EXT
: {
154 GLenum p
= (GLenum
) (GLint
) *params
;
155 if (!ctx
->Extensions
.EXT_fog_coord
||
156 (p
!= GL_FOG_COORDINATE_EXT
&& p
!= GL_FRAGMENT_DEPTH_EXT
)) {
157 _mesa_error(ctx
, GL_INVALID_ENUM
, "glFog");
160 if (ctx
->Fog
.FogCoordinateSource
== p
)
162 FLUSH_VERTICES(ctx
, _NEW_FOG
);
163 ctx
->Fog
.FogCoordinateSource
= p
;
167 _mesa_error( ctx
, GL_INVALID_ENUM
, "glFog" );
171 if (ctx
->Driver
.Fogfv
) {
172 (*ctx
->Driver
.Fogfv
)( ctx
, pname
, params
);
177 /**********************************************************************/
178 /***** Initialization *****/
179 /**********************************************************************/
181 void _mesa_init_fog( GLcontext
* ctx
)
184 ctx
->Fog
.Enabled
= GL_FALSE
;
185 ctx
->Fog
.Mode
= GL_EXP
;
186 ASSIGN_4V( ctx
->Fog
.Color
, 0.0, 0.0, 0.0, 0.0 );
187 ctx
->Fog
.Index
= 0.0;
188 ctx
->Fog
.Density
= 1.0;
189 ctx
->Fog
.Start
= 0.0;
191 ctx
->Fog
.ColorSumEnabled
= GL_FALSE
;
192 ctx
->Fog
.FogCoordinateSource
= GL_FRAGMENT_DEPTH_EXT
;
193 ctx
->Fog
._Scale
= 1.0f
;