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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2003 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*/
#include "glheader.h"
#include "context.h"
#include "fog.h"
#include "macros.h"
#include "mtypes.h"
void GLAPIENTRY
_mesa_Fogf(GLenum pname, GLfloat param)
{
GLfloat fparam[4];
fparam[0] = param;
fparam[1] = fparam[2] = fparam[3] = 0.0F;
_mesa_Fogfv(pname, fparam);
}
void GLAPIENTRY
_mesa_Fogi(GLenum pname, GLint param )
{
GLfloat fparam[4];
fparam[0] = (GLfloat) param;
fparam[1] = fparam[2] = fparam[3] = 0.0F;
_mesa_Fogfv(pname, fparam);
}
void GLAPIENTRY
_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 */
ASSIGN_4V(p, 0.0F, 0.0F, 0.0F, 0.0F);
}
_mesa_Fogfv(pname, p);
}
/**
* Update the gl_fog_attrib::_Scale field.
*/
static void
update_fog_scale(struct gl_context *ctx)
{
if (ctx->Fog.End == ctx->Fog.Start)
ctx->Fog._Scale = 1.0f;
else
ctx->Fog._Scale = 1.0f / (ctx->Fog.End - ctx->Fog.Start);
}
void GLAPIENTRY
_mesa_Fogfv( GLenum pname, const GLfloat *params )
{
GET_CURRENT_CONTEXT(ctx);
GLenum m;
switch (pname) {
case GL_FOG_MODE:
m = (GLenum) (GLint) *params;
switch (m) {
case GL_LINEAR:
case GL_EXP:
case GL_EXP2:
break;
default:
_mesa_error( ctx, GL_INVALID_ENUM, "glFog" );
return;
}
if (ctx->Fog.Mode == m)
return;
FLUSH_VERTICES(ctx, _NEW_FOG);
ctx->Fog.Mode = m;
break;
case GL_FOG_DENSITY:
if (*params<0.0) {
_mesa_error( ctx, GL_INVALID_VALUE, "glFog" );
return;
}
if (ctx->Fog.Density == *params)
return;
FLUSH_VERTICES(ctx, _NEW_FOG);
ctx->Fog.Density = *params;
break;
case GL_FOG_START:
if (ctx->Fog.Start == *params)
return;
FLUSH_VERTICES(ctx, _NEW_FOG);
ctx->Fog.Start = *params;
update_fog_scale(ctx);
break;
case GL_FOG_END:
if (ctx->Fog.End == *params)
return;
FLUSH_VERTICES(ctx, _NEW_FOG);
ctx->Fog.End = *params;
update_fog_scale(ctx);
break;
case GL_FOG_INDEX:
if (ctx->API != API_OPENGL_COMPAT)
goto invalid_pname;
if (ctx->Fog.Index == *params)
return;
FLUSH_VERTICES(ctx, _NEW_FOG);
ctx->Fog.Index = *params;
break;
case GL_FOG_COLOR:
if (TEST_EQ_4V(ctx->Fog.Color, params))
return;
FLUSH_VERTICES(ctx, _NEW_FOG);
ctx->Fog.ColorUnclamped[0] = params[0];
ctx->Fog.ColorUnclamped[1] = params[1];
ctx->Fog.ColorUnclamped[2] = params[2];
ctx->Fog.ColorUnclamped[3] = params[3];
ctx->Fog.Color[0] = CLAMP(params[0], 0.0F, 1.0F);
ctx->Fog.Color[1] = CLAMP(params[1], 0.0F, 1.0F);
ctx->Fog.Color[2] = CLAMP(params[2], 0.0F, 1.0F);
ctx->Fog.Color[3] = CLAMP(params[3], 0.0F, 1.0F);
break;
case GL_FOG_COORDINATE_SOURCE_EXT: {
GLenum p = (GLenum) (GLint) *params;
if (ctx->API != API_OPENGL_COMPAT ||
(p != GL_FOG_COORDINATE_EXT && p != GL_FRAGMENT_DEPTH_EXT)) {
_mesa_error(ctx, GL_INVALID_ENUM, "glFog");
return;
}
if (ctx->Fog.FogCoordinateSource == p)
return;
FLUSH_VERTICES(ctx, _NEW_FOG);
ctx->Fog.FogCoordinateSource = p;
break;
}
case GL_FOG_DISTANCE_MODE_NV: {
GLenum p = (GLenum) (GLint) *params;
if (ctx->API != API_OPENGL_COMPAT || !ctx->Extensions.NV_fog_distance ||
(p != GL_EYE_RADIAL_NV && p != GL_EYE_PLANE && p != GL_EYE_PLANE_ABSOLUTE_NV)) {
_mesa_error(ctx, GL_INVALID_ENUM, "glFog");
return;
}
if (ctx->Fog.FogDistanceMode == p)
return;
FLUSH_VERTICES(ctx, _NEW_FOG);
ctx->Fog.FogDistanceMode = p;
break;
}
default:
goto invalid_pname;
}
if (ctx->Driver.Fogfv) {
(*ctx->Driver.Fogfv)( ctx, pname, params );
}
return;
invalid_pname:
_mesa_error( ctx, GL_INVALID_ENUM, "glFog" );
return;
}
/**********************************************************************/
/***** Initialization *****/
/**********************************************************************/
void _mesa_init_fog( struct gl_context * ctx )
{
/* Fog group */
ctx->Fog.Enabled = GL_FALSE;
ctx->Fog.Mode = GL_EXP;
ASSIGN_4V( ctx->Fog.Color, 0.0, 0.0, 0.0, 0.0 );
ASSIGN_4V( ctx->Fog.ColorUnclamped, 0.0, 0.0, 0.0, 0.0 );
ctx->Fog.Index = 0.0;
ctx->Fog.Density = 1.0;
ctx->Fog.Start = 0.0;
ctx->Fog.End = 1.0;
ctx->Fog.ColorSumEnabled = GL_FALSE;
ctx->Fog.FogCoordinateSource = GL_FRAGMENT_DEPTH_EXT;
ctx->Fog._Scale = 1.0f;
ctx->Fog.FogDistanceMode = GL_EYE_PLANE_ABSOLUTE_NV;
}
|
