src/mesa/main/depth.c

   1 /* $Id: depth.c,v 1.29 2002/06/13 04:28:29 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.1
   6  *
   7  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #ifdef PC_HEADER
  29 #include "all.h"
  30 #else
  31 #include "glheader.h"
  32 #include "context.h"
  33 #include "enums.h"
  34 #include "depth.h"
  35 #include "macros.h"
  36 #include "mem.h"
  37 #include "mtypes.h"
  38 #endif
  39
  40
  41
  42 /**********************************************************************/
  43 /*****                          API Functions                     *****/
  44 /**********************************************************************/
  45
  46
  47
  48 void
  49 _mesa_ClearDepth( GLclampd depth )
  50 {
  51    GET_CURRENT_CONTEXT(ctx);
  52    GLfloat tmp = (GLfloat) CLAMP( depth, 0.0, 1.0 );
  53    ASSERT_OUTSIDE_BEGIN_END(ctx);
  54
  55    if (ctx->Depth.Clear == tmp)
  56       return;
  57
  58    FLUSH_VERTICES(ctx, _NEW_DEPTH);
  59    ctx->Depth.Clear = tmp;
  60    if (ctx->Driver.ClearDepth)
  61       (*ctx->Driver.ClearDepth)( ctx, ctx->Depth.Clear );
  62 }
  63
  64
  65
  66 void
  67 _mesa_DepthFunc( GLenum func )
  68 {
  69    GET_CURRENT_CONTEXT(ctx);
  70    ASSERT_OUTSIDE_BEGIN_END(ctx);
  71
  72    if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
  73       _mesa_debug("glDepthFunc %s\n", _mesa_lookup_enum_by_nr(func));
  74
  75    switch (func) {
  76    case GL_LESS:    /* (default) pass if incoming z < stored z */
  77    case GL_GEQUAL:
  78    case GL_LEQUAL:
  79    case GL_GREATER:
  80    case GL_NOTEQUAL:
  81    case GL_EQUAL:
  82    case GL_ALWAYS:
  83    case GL_NEVER:
  84       break;
  85    default:
  86       _mesa_error( ctx, GL_INVALID_ENUM, "glDepth.Func" );
  87       return;
  88    }
  89
  90    if (ctx->Depth.Func == func)
  91       return;
  92
  93    FLUSH_VERTICES(ctx, _NEW_DEPTH);
  94    ctx->Depth.Func = func;
  95
  96    if (ctx->Driver.DepthFunc)
  97       ctx->Driver.DepthFunc( ctx, func );
  98 }
  99
 100
 101
 102 void
 103 _mesa_DepthMask( GLboolean flag )
 104 {
 105    GET_CURRENT_CONTEXT(ctx);
 106    ASSERT_OUTSIDE_BEGIN_END(ctx);
 107
 108    if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
 109       _mesa_debug("glDepthMask %d\n", flag);
 110
 111    /*
 112     * GL_TRUE indicates depth buffer writing is enabled (default)
 113     * GL_FALSE indicates depth buffer writing is disabled
 114     */
 115    if (ctx->Depth.Mask == flag)
 116       return;
 117
 118    FLUSH_VERTICES(ctx, _NEW_DEPTH);
 119    ctx->Depth.Mask = flag;
 120
 121    if (ctx->Driver.DepthMask)
 122       ctx->Driver.DepthMask( ctx, flag );
 123 }