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 * THE AUTHORS 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);
46 if (MESA_VERBOSE & VERBOSE_API)
47 _mesa_debug(ctx, "glClearDepth(%f)\n", depth);
49 ctx->Depth.Clear = CLAMP( depth, 0.0, 1.0 );
54 _mesa_ClearDepthf( GLclampf depth )
56 _mesa_ClearDepth(depth);
61 _mesa_DepthFunc( GLenum func )
63 GET_CURRENT_CONTEXT(ctx);
65 if (MESA_VERBOSE & VERBOSE_API)
66 _mesa_debug(ctx, "glDepthFunc %s\n", _mesa_lookup_enum_by_nr(func));
69 case GL_LESS: /* (default) pass if incoming z < stored z */
79 _mesa_error( ctx, GL_INVALID_ENUM, "glDepth.Func" );
83 if (ctx->Depth.Func == func)
86 FLUSH_VERTICES(ctx, _NEW_DEPTH);
87 ctx->Depth.Func = func;
89 if (ctx->Driver.DepthFunc)
90 ctx->Driver.DepthFunc( ctx, func );
96 _mesa_DepthMask( GLboolean flag )
98 GET_CURRENT_CONTEXT(ctx);
100 if (MESA_VERBOSE & VERBOSE_API)
101 _mesa_debug(ctx, "glDepthMask %d\n", flag);
104 * GL_TRUE indicates depth buffer writing is enabled (default)
105 * GL_FALSE indicates depth buffer writing is disabled
107 if (ctx->Depth.Mask == flag)
110 FLUSH_VERTICES(ctx, _NEW_DEPTH);
111 ctx->Depth.Mask = flag;
113 if (ctx->Driver.DepthMask)
114 ctx->Driver.DepthMask( ctx, flag );
120 * Specified by the GL_EXT_depth_bounds_test extension.
123 _mesa_DepthBoundsEXT( GLclampd zmin, GLclampd zmax )
125 GET_CURRENT_CONTEXT(ctx);
127 if (MESA_VERBOSE & VERBOSE_API)
128 _mesa_debug(ctx, "glDepthBounds(%f, %f)\n", zmin, zmax);
131 _mesa_error(ctx, GL_INVALID_VALUE, "glDepthBoundsEXT(zmin > zmax)");
135 zmin = CLAMP(zmin, 0.0, 1.0);
136 zmax = CLAMP(zmax, 0.0, 1.0);
138 if (ctx->Depth.BoundsMin == zmin && ctx->Depth.BoundsMax == zmax)
141 FLUSH_VERTICES(ctx, _NEW_DEPTH);
142 ctx->Depth.BoundsMin = (GLfloat) zmin;
143 ctx->Depth.BoundsMax = (GLfloat) zmax;
147 /**********************************************************************/
148 /***** Initialization *****/
149 /**********************************************************************/
153 * Initialize the depth buffer attribute group in the given context.
156 _mesa_init_depth(struct gl_context *ctx)
158 ctx->Depth.Test = GL_FALSE;
159 ctx->Depth.Clear = 1.0;
160 ctx->Depth.Func = GL_LESS;
161 ctx->Depth.Mask = GL_TRUE;