1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25
26 #include "glheader.h"
27 #include "context.h"
28 #include "fog.h"
29 #include "macros.h"
30 #include "mtypes.h"
31
32
33
34 void GLAPIENTRY
_mesa_Fogf(GLenum pname,GLfloat param)35 _mesa_Fogf(GLenum pname, GLfloat param)
36 {
37 GLfloat fparam[4];
38 fparam[0] = param;
39 fparam[1] = fparam[2] = fparam[3] = 0.0F;
40 _mesa_Fogfv(pname, fparam);
41 }
42
43
44 void GLAPIENTRY
_mesa_Fogi(GLenum pname,GLint param)45 _mesa_Fogi(GLenum pname, GLint param )
46 {
47 GLfloat fparam[4];
48 fparam[0] = (GLfloat) param;
49 fparam[1] = fparam[2] = fparam[3] = 0.0F;
50 _mesa_Fogfv(pname, fparam);
51 }
52
53
54 void GLAPIENTRY
_mesa_Fogiv(GLenum pname,const GLint * params)55 _mesa_Fogiv(GLenum pname, const GLint *params )
56 {
57 GLfloat p[4];
58 switch (pname) {
59 case GL_FOG_MODE:
60 case GL_FOG_DENSITY:
61 case GL_FOG_START:
62 case GL_FOG_END:
63 case GL_FOG_INDEX:
64 case GL_FOG_COORDINATE_SOURCE_EXT:
65 case GL_FOG_DISTANCE_MODE_NV:
66 p[0] = (GLfloat) *params;
67 break;
68 case GL_FOG_COLOR:
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] );
73 break;
74 default:
75 /* Error will be caught later in _mesa_Fogfv */
76 ASSIGN_4V(p, 0.0F, 0.0F, 0.0F, 0.0F);
77 }
78 _mesa_Fogfv(pname, p);
79 }
80
81
82 void GLAPIENTRY
_mesa_Fogfv(GLenum pname,const GLfloat * params)83 _mesa_Fogfv( GLenum pname, const GLfloat *params )
84 {
85 GET_CURRENT_CONTEXT(ctx);
86 GLenum m;
87
88 switch (pname) {
89 case GL_FOG_MODE:
90 m = (GLenum) (GLint) *params;
91 switch (m) {
92 case GL_LINEAR:
93 ctx->Fog._PackedMode = FOG_LINEAR;
94 break;
95 case GL_EXP:
96 ctx->Fog._PackedMode = FOG_EXP;
97 break;
98 case GL_EXP2:
99 ctx->Fog._PackedMode = FOG_EXP2;
100 break;
101 default:
102 _mesa_error( ctx, GL_INVALID_ENUM, "glFog" );
103 return;
104 }
105 if (ctx->Fog.Mode == m)
106 return;
107 FLUSH_VERTICES(ctx, _NEW_FOG);
108 ctx->Fog.Mode = m;
109 ctx->Fog._PackedEnabledMode = ctx->Fog.Enabled ?
110 ctx->Fog._PackedMode : FOG_NONE;
111 break;
112 case GL_FOG_DENSITY:
113 if (*params<0.0F) {
114 _mesa_error( ctx, GL_INVALID_VALUE, "glFog" );
115 return;
116 }
117 if (ctx->Fog.Density == *params)
118 return;
119 FLUSH_VERTICES(ctx, _NEW_FOG);
120 ctx->Fog.Density = *params;
121 break;
122 case GL_FOG_START:
123 if (ctx->Fog.Start == *params)
124 return;
125 FLUSH_VERTICES(ctx, _NEW_FOG);
126 ctx->Fog.Start = *params;
127 break;
128 case GL_FOG_END:
129 if (ctx->Fog.End == *params)
130 return;
131 FLUSH_VERTICES(ctx, _NEW_FOG);
132 ctx->Fog.End = *params;
133 break;
134 case GL_FOG_INDEX:
135 if (ctx->API != API_OPENGL_COMPAT)
136 goto invalid_pname;
137 if (ctx->Fog.Index == *params)
138 return;
139 FLUSH_VERTICES(ctx, _NEW_FOG);
140 ctx->Fog.Index = *params;
141 break;
142 case GL_FOG_COLOR:
143 if (TEST_EQ_4V(ctx->Fog.Color, params))
144 return;
145 FLUSH_VERTICES(ctx, _NEW_FOG);
146 ctx->Fog.ColorUnclamped[0] = params[0];
147 ctx->Fog.ColorUnclamped[1] = params[1];
148 ctx->Fog.ColorUnclamped[2] = params[2];
149 ctx->Fog.ColorUnclamped[3] = params[3];
150 ctx->Fog.Color[0] = CLAMP(params[0], 0.0F, 1.0F);
151 ctx->Fog.Color[1] = CLAMP(params[1], 0.0F, 1.0F);
152 ctx->Fog.Color[2] = CLAMP(params[2], 0.0F, 1.0F);
153 ctx->Fog.Color[3] = CLAMP(params[3], 0.0F, 1.0F);
154 break;
155 case GL_FOG_COORDINATE_SOURCE_EXT: {
156 GLenum p = (GLenum) (GLint) *params;
157 if (ctx->API != API_OPENGL_COMPAT ||
158 (p != GL_FOG_COORDINATE_EXT && p != GL_FRAGMENT_DEPTH_EXT)) {
159 _mesa_error(ctx, GL_INVALID_ENUM, "glFog");
160 return;
161 }
162 if (ctx->Fog.FogCoordinateSource == p)
163 return;
164 FLUSH_VERTICES(ctx, _NEW_FOG);
165 ctx->Fog.FogCoordinateSource = p;
166 break;
167 }
168 case GL_FOG_DISTANCE_MODE_NV: {
169 GLenum p = (GLenum) (GLint) *params;
170 if (ctx->API != API_OPENGL_COMPAT || !ctx->Extensions.NV_fog_distance ||
171 (p != GL_EYE_RADIAL_NV && p != GL_EYE_PLANE && p != GL_EYE_PLANE_ABSOLUTE_NV)) {
172 _mesa_error(ctx, GL_INVALID_ENUM, "glFog");
173 return;
174 }
175 if (ctx->Fog.FogDistanceMode == p)
176 return;
177 FLUSH_VERTICES(ctx, _NEW_FOG);
178 ctx->Fog.FogDistanceMode = p;
179 break;
180 }
181 default:
182 goto invalid_pname;
183 }
184
185 if (ctx->Driver.Fogfv) {
186 ctx->Driver.Fogfv( ctx, pname, params );
187 }
188
189 return;
190
191 invalid_pname:
192 _mesa_error( ctx, GL_INVALID_ENUM, "glFog" );
193 return;
194 }
195
196
197 /**********************************************************************/
198 /***** Initialization *****/
199 /**********************************************************************/
200
_mesa_init_fog(struct gl_context * ctx)201 void _mesa_init_fog( struct gl_context * ctx )
202 {
203 /* Fog group */
204 ctx->Fog.Enabled = GL_FALSE;
205 ctx->Fog.Mode = GL_EXP;
206 ctx->Fog._PackedMode = FOG_EXP;
207 ctx->Fog._PackedEnabledMode = FOG_NONE;
208 ASSIGN_4V( ctx->Fog.Color, 0.0, 0.0, 0.0, 0.0 );
209 ASSIGN_4V( ctx->Fog.ColorUnclamped, 0.0, 0.0, 0.0, 0.0 );
210 ctx->Fog.Index = 0.0;
211 ctx->Fog.Density = 1.0;
212 ctx->Fog.Start = 0.0;
213 ctx->Fog.End = 1.0;
214 ctx->Fog.ColorSumEnabled = GL_FALSE;
215 ctx->Fog.FogCoordinateSource = GL_FRAGMENT_DEPTH_EXT;
216 ctx->Fog.FogDistanceMode = GL_EYE_PLANE_ABSOLUTE_NV;
217 }
218