summaryrefslogtreecommitdiff
path: root/src/mesa/main/fog.c
blob: 9593fa2a976cbc8a881d93c3aa0e960b7ead1907 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/* $Id: fog.c,v 1.29 2000/11/16 21:05:35 keithw Exp $ */

/*
 * Mesa 3-D graphics library
 * Version:  3.5
 * 
 * Copyright (C) 1999-2000  Brian Paul   All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */


#ifdef PC_HEADER
#include "all.h"
#else
#include "glheader.h"
#include "colormac.h"
#include "context.h"
#include "fog.h"
#include "types.h"
#endif



void
_mesa_Fogf(GLenum pname, GLfloat param)
{
   _mesa_Fogfv(pname, &param);
}


void
_mesa_Fogi(GLenum pname, GLint param )
{
   GLfloat fparam = (GLfloat) param;
   _mesa_Fogfv(pname, &fparam);
}


void
_mesa_Fogiv(GLenum pname, const GLint *params )
{
   GLfloat p[4];
   switch (pname) {
      case GL_FOG_MODE:
      case GL_FOG_DENSITY:
      case GL_FOG_START:
      case GL_FOG_END:
      case GL_FOG_INDEX:
      case GL_FOG_COORDINATE_SOURCE_EXT:
	 p[0] = (GLfloat) *params;
	 break;
      case GL_FOG_COLOR:
	 p[0] = INT_TO_FLOAT( params[0] );
	 p[1] = INT_TO_FLOAT( params[1] );
	 p[2] = INT_TO_FLOAT( params[2] );
	 p[3] = INT_TO_FLOAT( params[3] );
	 break;
      default:
         /* Error will be caught later in _mesa_Fogfv */
         ;
   }
   _mesa_Fogfv(pname, p);
}


void 
_mesa_Fogfv( GLenum pname, const GLfloat *params )
{
   GET_CURRENT_CONTEXT(ctx);
   GLenum m;

   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glFog");

   switch (pname) {
      case GL_FOG_MODE:
         m = (GLenum) (GLint) *params;
	 if (m==GL_LINEAR || m==GL_EXP || m==GL_EXP2) {
	    ctx->Fog.Mode = m;
	 }
	 else {
	    gl_error( ctx, GL_INVALID_ENUM, "glFog" );
            return;
	 }
	 break;
      case GL_FOG_DENSITY:
	 if (*params<0.0) {
	    gl_error( ctx, GL_INVALID_VALUE, "glFog" );
            return;
	 }
	 else {
	    ctx->Fog.Density = *params;
	 }
	 break;
      case GL_FOG_START:
	 ctx->Fog.Start = *params;
	 break;
      case GL_FOG_END:
	 ctx->Fog.End = *params;
	 break;
      case GL_FOG_INDEX:
	 ctx->Fog.Index = *params;
	 break;
      case GL_FOG_COLOR:
	 ctx->Fog.Color[0] = params[0];
	 ctx->Fog.Color[1] = params[1];
	 ctx->Fog.Color[2] = params[2];
	 ctx->Fog.Color[3] = params[3];
         break;
      case GL_FOG_COORDINATE_SOURCE_EXT: {
	 GLenum p = (GLenum)(GLint) *params;
	 if (p == GL_FOG_COORDINATE_EXT || p == GL_FRAGMENT_DEPTH_EXT)
	    ctx->Fog.FogCoordinateSource = p;
	 else
	    gl_error( ctx, GL_INVALID_ENUM, "glFog" );
	 break;
      }
      default:
         gl_error( ctx, GL_INVALID_ENUM, "glFog" );
         return;
   }

   if (ctx->Driver.Fogfv) {
      (*ctx->Driver.Fogfv)( ctx, pname, params );
   }

   ctx->NewState |= _NEW_FOG;
}