2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2007 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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
36 /**********************************************************************/
37 /***** API Functions *****/
38 /**********************************************************************/
43 _mesa_ClearDepth( GLclampd depth
)
45 GET_CURRENT_CONTEXT(ctx
);
47 if (MESA_VERBOSE
& VERBOSE_API
)
48 _mesa_debug(ctx
, "glClearDepth(%f)\n", depth
);
50 ctx
->Depth
.Clear
= CLAMP( depth
, 0.0, 1.0 );
55 _mesa_ClearDepthf( GLclampf depth
)
57 _mesa_ClearDepth(depth
);
62 _mesa_DepthFunc( GLenum func
)
64 GET_CURRENT_CONTEXT(ctx
);
66 if (MESA_VERBOSE
& VERBOSE_API
)
67 _mesa_debug(ctx
, "glDepthFunc %s\n", _mesa_lookup_enum_by_nr(func
));
70 case GL_LESS
: /* (default) pass if incoming z < stored z */
80 _mesa_error( ctx
, GL_INVALID_ENUM
, "glDepth.Func" );
84 if (ctx
->Depth
.Func
== func
)
87 FLUSH_VERTICES(ctx
, _NEW_DEPTH
);
88 ctx
->Depth
.Func
= func
;
90 if (ctx
->Driver
.DepthFunc
)
91 ctx
->Driver
.DepthFunc( ctx
, func
);
97 _mesa_DepthMask( GLboolean flag
)
99 GET_CURRENT_CONTEXT(ctx
);
101 if (MESA_VERBOSE
& VERBOSE_API
)
102 _mesa_debug(ctx
, "glDepthMask %d\n", flag
);
105 * GL_TRUE indicates depth buffer writing is enabled (default)
106 * GL_FALSE indicates depth buffer writing is disabled
108 if (ctx
->Depth
.Mask
== flag
)
111 FLUSH_VERTICES(ctx
, _NEW_DEPTH
);
112 ctx
->Depth
.Mask
= flag
;
114 if (ctx
->Driver
.DepthMask
)
115 ctx
->Driver
.DepthMask( ctx
, flag
);
121 * Specified by the GL_EXT_depth_bounds_test extension.
124 _mesa_DepthBoundsEXT( GLclampd zmin
, GLclampd zmax
)
126 GET_CURRENT_CONTEXT(ctx
);
128 if (MESA_VERBOSE
& VERBOSE_API
)
129 _mesa_debug(ctx
, "glDepthBounds(%f, %f)\n", zmin
, zmax
);
132 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDepthBoundsEXT(zmin > zmax)");
136 zmin
= CLAMP(zmin
, 0.0, 1.0);
137 zmax
= CLAMP(zmax
, 0.0, 1.0);
139 if (ctx
->Depth
.BoundsMin
== zmin
&& ctx
->Depth
.BoundsMax
== zmax
)
142 FLUSH_VERTICES(ctx
, _NEW_DEPTH
);
143 ctx
->Depth
.BoundsMin
= (GLfloat
) zmin
;
144 ctx
->Depth
.BoundsMax
= (GLfloat
) zmax
;
148 /**********************************************************************/
149 /***** Initialization *****/
150 /**********************************************************************/
154 * Initialize the depth buffer attribute group in the given context.
157 _mesa_init_depth(struct gl_context
*ctx
)
159 ctx
->Depth
.Test
= GL_FALSE
;
160 ctx
->Depth
.Clear
= 1.0;
161 ctx
->Depth
.Func
= GL_LESS
;
162 ctx
->Depth
.Mask
= GL_TRUE
;