1/*
2 * Mesa 3-D graphics library
3 * Version:  7.1
4 *
5 * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
6 *
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:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
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 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25
26#include "glheader.h"
27#include "imports.h"
28#include "context.h"
29#include "depth.h"
30#include "enums.h"
31#include "macros.h"
32#include "mtypes.h"
33
34
35/**********************************************************************/
36/*****                          API Functions                     *****/
37/**********************************************************************/
38
39
40
41void GLAPIENTRY
42_mesa_ClearDepth( GLclampd depth )
43{
44   GET_CURRENT_CONTEXT(ctx);
45   ASSERT_OUTSIDE_BEGIN_END(ctx);
46
47   if (MESA_VERBOSE & VERBOSE_API)
48      _mesa_debug(ctx, "glClearDepth(%f)\n", depth);
49
50   depth = CLAMP( depth, 0.0, 1.0 );
51
52   if (ctx->Depth.Clear == depth)
53      return;
54
55   FLUSH_VERTICES(ctx, _NEW_DEPTH);
56   ctx->Depth.Clear = depth;
57}
58
59
60void GLAPIENTRY
61_mesa_ClearDepthf( GLclampf depth )
62{
63   _mesa_ClearDepth(depth);
64}
65
66
67void GLAPIENTRY
68_mesa_DepthFunc( GLenum func )
69{
70   GET_CURRENT_CONTEXT(ctx);
71   ASSERT_OUTSIDE_BEGIN_END(ctx);
72
73   if (MESA_VERBOSE & VERBOSE_API)
74      _mesa_debug(ctx, "glDepthFunc %s\n", _mesa_lookup_enum_by_nr(func));
75
76   switch (func) {
77   case GL_LESS:    /* (default) pass if incoming z < stored z */
78   case GL_GEQUAL:
79   case GL_LEQUAL:
80   case GL_GREATER:
81   case GL_NOTEQUAL:
82   case GL_EQUAL:
83   case GL_ALWAYS:
84   case GL_NEVER:
85      break;
86   default:
87      _mesa_error( ctx, GL_INVALID_ENUM, "glDepth.Func" );
88      return;
89   }
90
91   if (ctx->Depth.Func == func)
92      return;
93
94   FLUSH_VERTICES(ctx, _NEW_DEPTH);
95   ctx->Depth.Func = func;
96
97   if (ctx->Driver.DepthFunc)
98      ctx->Driver.DepthFunc( ctx, func );
99}
100
101
102
103void GLAPIENTRY
104_mesa_DepthMask( GLboolean flag )
105{
106   GET_CURRENT_CONTEXT(ctx);
107   ASSERT_OUTSIDE_BEGIN_END(ctx);
108
109   if (MESA_VERBOSE & VERBOSE_API)
110      _mesa_debug(ctx, "glDepthMask %d\n", flag);
111
112   /*
113    * GL_TRUE indicates depth buffer writing is enabled (default)
114    * GL_FALSE indicates depth buffer writing is disabled
115    */
116   if (ctx->Depth.Mask == flag)
117      return;
118
119   FLUSH_VERTICES(ctx, _NEW_DEPTH);
120   ctx->Depth.Mask = flag;
121
122   if (ctx->Driver.DepthMask)
123      ctx->Driver.DepthMask( ctx, flag );
124}
125
126
127
128/**
129 * Specified by the GL_EXT_depth_bounds_test extension.
130 */
131void GLAPIENTRY
132_mesa_DepthBoundsEXT( GLclampd zmin, GLclampd zmax )
133{
134   GET_CURRENT_CONTEXT(ctx);
135   ASSERT_OUTSIDE_BEGIN_END(ctx);
136
137   if (MESA_VERBOSE & VERBOSE_API)
138      _mesa_debug(ctx, "glDepthBounds(%f, %f)\n", zmin, zmax);
139
140   if (zmin > zmax) {
141      _mesa_error(ctx, GL_INVALID_VALUE, "glDepthBoundsEXT(zmin > zmax)");
142      return;
143   }
144
145   zmin = CLAMP(zmin, 0.0, 1.0);
146   zmax = CLAMP(zmax, 0.0, 1.0);
147
148   if (ctx->Depth.BoundsMin == zmin && ctx->Depth.BoundsMax == zmax)
149      return;
150
151   FLUSH_VERTICES(ctx, _NEW_DEPTH);
152   ctx->Depth.BoundsMin = (GLfloat) zmin;
153   ctx->Depth.BoundsMax = (GLfloat) zmax;
154}
155
156
157/**********************************************************************/
158/*****                      Initialization                        *****/
159/**********************************************************************/
160
161
162/**
163 * Initialize the depth buffer attribute group in the given context.
164 */
165void
166_mesa_init_depth(struct gl_context *ctx)
167{
168   ctx->Depth.Test = GL_FALSE;
169   ctx->Depth.Clear = 1.0;
170   ctx->Depth.Func = GL_LESS;
171   ctx->Depth.Mask = GL_TRUE;
172}
173