1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2007 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
28 #include "context.h"
29 #include "depth.h"
30 #include "enums.h"
31 #include "macros.h"
32 #include "mtypes.h"
33 #include "state.h"
34
35
36 /**********************************************************************/
37 /***** API Functions *****/
38 /**********************************************************************/
39
40
41
42 void GLAPIENTRY
_mesa_ClearDepth(GLclampd depth)43 _mesa_ClearDepth( GLclampd depth )
44 {
45 GET_CURRENT_CONTEXT(ctx);
46
47 if (MESA_VERBOSE & VERBOSE_API)
48 _mesa_debug(ctx, "glClearDepth(%f)\n", depth);
49
50 ctx->PopAttribState |= GL_DEPTH_BUFFER_BIT;
51 ctx->Depth.Clear = CLAMP( depth, 0.0, 1.0 );
52 }
53
54
55 void GLAPIENTRY
_mesa_ClearDepthf(GLclampf depth)56 _mesa_ClearDepthf( GLclampf depth )
57 {
58 _mesa_ClearDepth(depth);
59 }
60
61
62 static ALWAYS_INLINE void
depth_func(struct gl_context * ctx,GLenum func,bool no_error)63 depth_func(struct gl_context *ctx, GLenum func, bool no_error)
64 {
65 if (ctx->Depth.Func == func)
66 return;
67
68 if (!no_error) {
69 switch (func) {
70 case GL_LESS: /* (default) pass if incoming z < stored z */
71 case GL_GEQUAL:
72 case GL_LEQUAL:
73 case GL_GREATER:
74 case GL_NOTEQUAL:
75 case GL_EQUAL:
76 case GL_ALWAYS:
77 case GL_NEVER:
78 break;
79 default:
80 _mesa_error(ctx, GL_INVALID_ENUM, "glDepth.Func");
81 return;
82 }
83 }
84
85 FLUSH_VERTICES(ctx, ctx->DriverFlags.NewDepth ? 0 : _NEW_DEPTH,
86 GL_DEPTH_BUFFER_BIT);
87 ctx->NewDriverState |= ctx->DriverFlags.NewDepth;
88 ctx->Depth.Func = func;
89 _mesa_update_allow_draw_out_of_order(ctx);
90
91 if (ctx->Driver.DepthFunc)
92 ctx->Driver.DepthFunc(ctx, func);
93 }
94
95
96 void GLAPIENTRY
_mesa_DepthFunc_no_error(GLenum func)97 _mesa_DepthFunc_no_error(GLenum func)
98 {
99 GET_CURRENT_CONTEXT(ctx);
100 depth_func(ctx, func, true);
101 }
102
103
104 void GLAPIENTRY
_mesa_DepthFunc(GLenum func)105 _mesa_DepthFunc(GLenum func)
106 {
107 GET_CURRENT_CONTEXT(ctx);
108
109 if (MESA_VERBOSE & VERBOSE_API)
110 _mesa_debug(ctx, "glDepthFunc %s\n", _mesa_enum_to_string(func));
111
112 depth_func(ctx, func, false);
113 }
114
115
116
117 void GLAPIENTRY
_mesa_DepthMask(GLboolean flag)118 _mesa_DepthMask( GLboolean flag )
119 {
120 GET_CURRENT_CONTEXT(ctx);
121
122 if (MESA_VERBOSE & VERBOSE_API)
123 _mesa_debug(ctx, "glDepthMask %d\n", flag);
124
125 /*
126 * GL_TRUE indicates depth buffer writing is enabled (default)
127 * GL_FALSE indicates depth buffer writing is disabled
128 */
129 if (ctx->Depth.Mask == flag)
130 return;
131
132 FLUSH_VERTICES(ctx, ctx->DriverFlags.NewDepth ? 0 : _NEW_DEPTH,
133 GL_DEPTH_BUFFER_BIT);
134 ctx->NewDriverState |= ctx->DriverFlags.NewDepth;
135 ctx->Depth.Mask = flag;
136 _mesa_update_allow_draw_out_of_order(ctx);
137
138 if (ctx->Driver.DepthMask)
139 ctx->Driver.DepthMask( ctx, flag );
140 }
141
142
143
144 /**
145 * Specified by the GL_EXT_depth_bounds_test extension.
146 */
147 void GLAPIENTRY
_mesa_DepthBoundsEXT(GLclampd zmin,GLclampd zmax)148 _mesa_DepthBoundsEXT( GLclampd zmin, GLclampd zmax )
149 {
150 GET_CURRENT_CONTEXT(ctx);
151
152 if (MESA_VERBOSE & VERBOSE_API)
153 _mesa_debug(ctx, "glDepthBounds(%f, %f)\n", zmin, zmax);
154
155 if (zmin > zmax) {
156 _mesa_error(ctx, GL_INVALID_VALUE, "glDepthBoundsEXT(zmin > zmax)");
157 return;
158 }
159
160 zmin = SATURATE(zmin);
161 zmax = SATURATE(zmax);
162
163 if (ctx->Depth.BoundsMin == zmin && ctx->Depth.BoundsMax == zmax)
164 return;
165
166 FLUSH_VERTICES(ctx, ctx->DriverFlags.NewDepth ? 0 : _NEW_DEPTH,
167 GL_DEPTH_BUFFER_BIT);
168 ctx->NewDriverState |= ctx->DriverFlags.NewDepth;
169 ctx->Depth.BoundsMin = zmin;
170 ctx->Depth.BoundsMax = zmax;
171 }
172
173
174 /**********************************************************************/
175 /***** Initialization *****/
176 /**********************************************************************/
177
178
179 /**
180 * Initialize the depth buffer attribute group in the given context.
181 */
182 void
_mesa_init_depth(struct gl_context * ctx)183 _mesa_init_depth(struct gl_context *ctx)
184 {
185 ctx->Depth.Test = GL_FALSE;
186 ctx->Depth.Clear = 1.0;
187 ctx->Depth.Func = GL_LESS;
188 ctx->Depth.Mask = GL_TRUE;
189 }
190