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
41 void GLAPIENTRY
_mesa_ClearDepth(GLclampd depth)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
60 void GLAPIENTRY
_mesa_ClearDepthf(GLclampf depth)61 _mesa_ClearDepthf( GLclampf depth )
62 {
63 _mesa_ClearDepth(depth);
64 }
65
66
67 void GLAPIENTRY
_mesa_DepthFunc(GLenum func)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
103 void GLAPIENTRY
_mesa_DepthMask(GLboolean flag)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 */
131 void GLAPIENTRY
_mesa_DepthBoundsEXT(GLclampd zmin,GLclampd zmax)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 */
165 void
_mesa_init_depth(struct gl_context * ctx)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