src/mesa/main/depth.c

   1 /* $Id: depth.c,v 1.23 2000/11/05 18:40:57 keithw Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   6  *
   7  * Copyright (C) 1999-2000  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 "types.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    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glClearDepth");
  53    ctx->Depth.Clear = (GLfloat) CLAMP( depth, 0.0, 1.0 );
  54    if (ctx->Driver.ClearDepth)
  55       (*ctx->Driver.ClearDepth)( ctx, ctx->Depth.Clear );
  56    ctx->NewState |= _NEW_DEPTH;
  57 }
  58
  59
  60
  61 void
  62 _mesa_DepthFunc( GLenum func )
  63 {
  64    GET_CURRENT_CONTEXT(ctx);
  65    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glDepthFunc");
  66
  67    if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
  68       fprintf(stderr, "glDepthFunc %s\n", gl_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          if (ctx->Depth.Func != func) {
  79             ctx->Depth.Func = func;
  80             ctx->NewState |= _NEW_DEPTH;
  81             ctx->_TriangleCaps &= ~DD_Z_NEVER;
  82             if (ctx->Driver.DepthFunc) {
  83                (*ctx->Driver.DepthFunc)( ctx, func );
  84             }
  85          }
  86          break;
  87       case GL_NEVER:
  88          if (ctx->Depth.Func != func) {
  89             ctx->Depth.Func = func;
  90             ctx->NewState |= _NEW_DEPTH;
  91             ctx->_TriangleCaps |= DD_Z_NEVER;
  92             if (ctx->Driver.DepthFunc) {
  93                (*ctx->Driver.DepthFunc)( ctx, func );
  94             }
  95          }
  96          break;
  97       default:
  98          gl_error( ctx, GL_INVALID_ENUM, "glDepth.Func" );
  99    }
 100 }
 101
 102
 103
 104 void
 105 _mesa_DepthMask( GLboolean flag )
 106 {
 107    GET_CURRENT_CONTEXT(ctx);
 108    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glDepthMask");
 109
 110    if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
 111       fprintf(stderr, "glDepthMask %d\n", flag);
 112
 113    /*
 114     * GL_TRUE indicates depth buffer writing is enabled (default)
 115     * GL_FALSE indicates depth buffer writing is disabled
 116     */
 117    if (ctx->Depth.Mask != flag) {
 118       ctx->Depth.Mask = flag;
 119       ctx->NewState |= _NEW_DEPTH;
 120       if (ctx->Driver.DepthMask) {
 121          (*ctx->Driver.DepthMask)( ctx, flag );
 122       }
 123    }
 124 }
 125
 126