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