2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
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.
35 /**********************************************************************/
36 /***** API Functions *****/
37 /**********************************************************************/
42 _mesa_ClearDepth( GLclampd depth )
44 GET_CURRENT_CONTEXT(ctx);
45 ASSERT_OUTSIDE_BEGIN_END(ctx);
47 if (MESA_VERBOSE & VERBOSE_API)
48 _mesa_debug(ctx, "glClearDepth(%f)\n", depth);
50 depth = CLAMP( depth, 0.0, 1.0 );
52 if (ctx->Depth.Clear == depth)
55 FLUSH_VERTICES(ctx, _NEW_DEPTH);
56 ctx->Depth.Clear = depth;
57 if (ctx->Driver.ClearDepth)
58 (*ctx->Driver.ClearDepth)( ctx, ctx->Depth.Clear );
63 _mesa_ClearDepthf( GLclampf depth )
65 _mesa_ClearDepth(depth);
70 _mesa_DepthFunc( GLenum func )
72 GET_CURRENT_CONTEXT(ctx);
73 ASSERT_OUTSIDE_BEGIN_END(ctx);
75 if (MESA_VERBOSE & VERBOSE_API)
76 _mesa_debug(ctx, "glDepthFunc %s\n", _mesa_lookup_enum_by_nr(func));
79 case GL_LESS: /* (default) pass if incoming z < stored z */
89 _mesa_error( ctx, GL_INVALID_ENUM, "glDepth.Func" );
93 if (ctx->Depth.Func == func)
96 FLUSH_VERTICES(ctx, _NEW_DEPTH);
97 ctx->Depth.Func = func;
99 if (ctx->Driver.DepthFunc)
100 ctx->Driver.DepthFunc( ctx, func );
106 _mesa_DepthMask( GLboolean flag )
108 GET_CURRENT_CONTEXT(ctx);
109 ASSERT_OUTSIDE_BEGIN_END(ctx);
111 if (MESA_VERBOSE & VERBOSE_API)
112 _mesa_debug(ctx, "glDepthMask %d\n", flag);
115 * GL_TRUE indicates depth buffer writing is enabled (default)
116 * GL_FALSE indicates depth buffer writing is disabled
118 if (ctx->Depth.Mask == flag)
121 FLUSH_VERTICES(ctx, _NEW_DEPTH);
122 ctx->Depth.Mask = flag;
124 if (ctx->Driver.DepthMask)
125 ctx->Driver.DepthMask( ctx, flag );
131 * Specified by the GL_EXT_depth_bounds_test extension.
134 _mesa_DepthBoundsEXT( GLclampd zmin, GLclampd zmax )
136 GET_CURRENT_CONTEXT(ctx);
137 ASSERT_OUTSIDE_BEGIN_END(ctx);
139 if (MESA_VERBOSE & VERBOSE_API)
140 _mesa_debug(ctx, "glDepthBounds(%f, %f)\n", zmin, zmax);
143 _mesa_error(ctx, GL_INVALID_VALUE, "glDepthBoundsEXT(zmin > zmax)");
147 zmin = CLAMP(zmin, 0.0, 1.0);
148 zmax = CLAMP(zmax, 0.0, 1.0);
150 if (ctx->Depth.BoundsMin == zmin && ctx->Depth.BoundsMax == zmax)
153 FLUSH_VERTICES(ctx, _NEW_DEPTH);
154 ctx->Depth.BoundsMin = (GLfloat) zmin;
155 ctx->Depth.BoundsMax = (GLfloat) zmax;
159 /**********************************************************************/
160 /***** Initialization *****/
161 /**********************************************************************/
165 * Initialize the depth buffer attribute group in the given context.
168 _mesa_init_depth(struct gl_context *ctx)
170 ctx->Depth.Test = GL_FALSE;
171 ctx->Depth.Clear = 1.0;
172 ctx->Depth.Func = GL_LESS;
173 ctx->Depth.Mask = GL_TRUE;