Subversion Repositories shark

Rev

Rev 55 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
55 pj 1
/* $Id: depth.c,v 1.1 2003-02-28 11:41:59 pj Exp $ */
2
 
3
/*
4
 * Mesa 3-D graphics library
5
 * Version:  4.1
6
 *
7
 * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
8
 *
9
 * Permission is hereby granted, free of charge, to any person obtaining a
10
 * copy of this software and associated documentation files (the "Software"),
11
 * to deal in the Software without restriction, including without limitation
12
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13
 * and/or sell copies of the Software, and to permit persons to whom the
14
 * Software is furnished to do so, subject to the following conditions:
15
 *
16
 * The above copyright notice and this permission notice shall be included
17
 * in all copies or substantial portions of the Software.
18
 *
19
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
22
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25
 */
26
 
27
 
28
#include "glheader.h"
29
#include "imports.h"
30
#include "context.h"
31
#include "enums.h"
32
#include "depth.h"
33
#include "macros.h"
34
#include "mtypes.h"
35
 
36
 
37
/**********************************************************************/
38
/*****                          API Functions                     *****/
39
/**********************************************************************/
40
 
41
 
42
 
43
void
44
_mesa_ClearDepth( GLclampd depth )
45
{
46
   GET_CURRENT_CONTEXT(ctx);
47
   GLfloat tmp = (GLfloat) CLAMP( depth, 0.0, 1.0 );
48
   ASSERT_OUTSIDE_BEGIN_END(ctx);
49
 
50
   if (ctx->Depth.Clear == tmp)
51
      return;
52
 
53
   FLUSH_VERTICES(ctx, _NEW_DEPTH);
54
   ctx->Depth.Clear = tmp;
55
   if (ctx->Driver.ClearDepth)
56
      (*ctx->Driver.ClearDepth)( ctx, ctx->Depth.Clear );
57
}
58
 
59
 
60
 
61
void
62
_mesa_DepthFunc( GLenum func )
63
{
64
   GET_CURRENT_CONTEXT(ctx);
65
   ASSERT_OUTSIDE_BEGIN_END(ctx);
66
 
67
   if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
68
      _mesa_debug(ctx, "glDepthFunc %s\n", _mesa_lookup_enum_by_nr(func));
69
 
70
   switch (func) {
71
   case GL_LESS:    /* (default) pass if incoming z < stored z */
72
   case GL_GEQUAL:
73
   case GL_LEQUAL:
74
   case GL_GREATER:
75
   case GL_NOTEQUAL:
76
   case GL_EQUAL:
77
   case GL_ALWAYS:
78
   case GL_NEVER:
79
      break;
80
   default:
81
      _mesa_error( ctx, GL_INVALID_ENUM, "glDepth.Func" );
82
      return;
83
   }
84
 
85
   if (ctx->Depth.Func == func)
86
      return;
87
 
88
   FLUSH_VERTICES(ctx, _NEW_DEPTH);
89
   ctx->Depth.Func = func;
90
 
91
   if (ctx->Driver.DepthFunc)
92
      ctx->Driver.DepthFunc( ctx, func );
93
}
94
 
95
 
96
 
97
void
98
_mesa_DepthMask( GLboolean flag )
99
{
100
   GET_CURRENT_CONTEXT(ctx);
101
   ASSERT_OUTSIDE_BEGIN_END(ctx);
102
 
103
   if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
104
      _mesa_debug(ctx, "glDepthMask %d\n", flag);
105
 
106
   /*
107
    * GL_TRUE indicates depth buffer writing is enabled (default)
108
    * GL_FALSE indicates depth buffer writing is disabled
109
    */
110
   if (ctx->Depth.Mask == flag)
111
      return;
112
 
113
   FLUSH_VERTICES(ctx, _NEW_DEPTH);
114
   ctx->Depth.Mask = flag;
115
 
116
   if (ctx->Driver.DepthMask)
117
      ctx->Driver.DepthMask( ctx, flag );
118
}