src/mesa/main/depth.c

   1 /* $Id: depth.c,v 1.31 2002/10/24 23:57:20 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 #include "glheader.h"
  29 #include "imports.h"
  30 #include "context.h"
  31 #include "enums.h"
  32 #include "depth.h"
  33 #include "macros.h"
  34 #include "mtypes.h"
  35
  36
  37 /**********************************************************************/
  38 /*****                          API Functions                     *****/
  39 /**********************************************************************/
  40
  41
  42
  43 void
  44 _mesa_ClearDepth( GLclampd depth )
  45 {
  46    GET_CURRENT_CONTEXT(ctx);
  47    GLfloat tmp = (GLfloat) CLAMP( depth, 0.0, 1.0 );
  48    ASSERT_OUTSIDE_BEGIN_END(ctx);
  49
  50    if (ctx->Depth.Clear == tmp)
  51       return;
  52
  53    FLUSH_VERTICES(ctx, _NEW_DEPTH);
  54    ctx->Depth.Clear = tmp;
  55    if (ctx->Driver.ClearDepth)
  56       (*ctx->Driver.ClearDepth)( ctx, ctx->Depth.Clear );
  57 }
  58
  59
  60
  61 void
  62 _mesa_DepthFunc( GLenum func )
  63 {
  64    GET_CURRENT_CONTEXT(ctx);
  65    ASSERT_OUTSIDE_BEGIN_END(ctx);
  66
  67    if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
  68       _mesa_debug(ctx, "glDepthFunc %s\n", _mesa_lookup_enum_by_nr(func));
  69
  70    switch (func) {
  71    case GL_LESS:    /* (default) pass if incoming z < stored z */
  72    case GL_GEQUAL:
  73    case GL_LEQUAL:
  74    case GL_GREATER:
  75    case GL_NOTEQUAL:
  76    case GL_EQUAL:
  77    case GL_ALWAYS:
  78    case GL_NEVER:
  79       break;
  80    default:
  81       _mesa_error( ctx, GL_INVALID_ENUM, "glDepth.Func" );
  82       return;
  83    }
  84
  85    if (ctx->Depth.Func == func)
  86       return;
  87
  88    FLUSH_VERTICES(ctx, _NEW_DEPTH);
  89    ctx->Depth.Func = func;
  90
  91    if (ctx->Driver.DepthFunc)
  92       ctx->Driver.DepthFunc( ctx, func );
  93 }
  94
  95
  96
  97 void
  98 _mesa_DepthMask( GLboolean flag )
  99 {
 100    GET_CURRENT_CONTEXT(ctx);
 101    ASSERT_OUTSIDE_BEGIN_END(ctx);
 102
 103    if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
 104       _mesa_debug(ctx, "glDepthMask %d\n", flag);
 105
 106    /*
 107     * GL_TRUE indicates depth buffer writing is enabled (default)
 108     * GL_FALSE indicates depth buffer writing is disabled
 109     */
 110    if (ctx->Depth.Mask == flag)
 111       return;
 112
 113    FLUSH_VERTICES(ctx, _NEW_DEPTH);
 114    ctx->Depth.Mask = flag;
 115
 116    if (ctx->Driver.DepthMask)
 117       ctx->Driver.DepthMask( ctx, flag );
 118 }