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      1 /*
      2  * Mesa 3-D graphics library
      3  *
      4  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included
     14  * in all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  */
     24 
     25 
     26 #include "glheader.h"
     27 #include "imports.h"
     28 #include "context.h"
     29 #include "depth.h"
     30 #include "enums.h"
     31 #include "macros.h"
     32 #include "mtypes.h"
     33 
     34 
     35 /**********************************************************************/
     36 /*****                          API Functions                     *****/
     37 /**********************************************************************/
     38 
     39 
     40 
     41 void GLAPIENTRY
     42 _mesa_ClearDepth( GLclampd depth )
     43 {
     44    GET_CURRENT_CONTEXT(ctx);
     45 
     46    if (MESA_VERBOSE & VERBOSE_API)
     47       _mesa_debug(ctx, "glClearDepth(%f)\n", depth);
     48 
     49    ctx->Depth.Clear = CLAMP( depth, 0.0, 1.0 );
     50 }
     51 
     52 
     53 void GLAPIENTRY
     54 _mesa_ClearDepthf( GLclampf depth )
     55 {
     56    _mesa_ClearDepth(depth);
     57 }
     58 
     59 
     60 void GLAPIENTRY
     61 _mesa_DepthFunc( GLenum func )
     62 {
     63    GET_CURRENT_CONTEXT(ctx);
     64 
     65    if (MESA_VERBOSE & VERBOSE_API)
     66       _mesa_debug(ctx, "glDepthFunc %s\n", _mesa_enum_to_string(func));
     67 
     68    if (ctx->Depth.Func == func)
     69       return;
     70 
     71    switch (func) {
     72    case GL_LESS:    /* (default) pass if incoming z < stored z */
     73    case GL_GEQUAL:
     74    case GL_LEQUAL:
     75    case GL_GREATER:
     76    case GL_NOTEQUAL:
     77    case GL_EQUAL:
     78    case GL_ALWAYS:
     79    case GL_NEVER:
     80       break;
     81    default:
     82       _mesa_error( ctx, GL_INVALID_ENUM, "glDepth.Func" );
     83       return;
     84    }
     85 
     86    FLUSH_VERTICES(ctx, _NEW_DEPTH);
     87    ctx->Depth.Func = func;
     88 
     89    if (ctx->Driver.DepthFunc)
     90       ctx->Driver.DepthFunc( ctx, func );
     91 }
     92 
     93 
     94 
     95 void GLAPIENTRY
     96 _mesa_DepthMask( GLboolean flag )
     97 {
     98    GET_CURRENT_CONTEXT(ctx);
     99 
    100    if (MESA_VERBOSE & VERBOSE_API)
    101       _mesa_debug(ctx, "glDepthMask %d\n", flag);
    102 
    103    /*
    104     * GL_TRUE indicates depth buffer writing is enabled (default)
    105     * GL_FALSE indicates depth buffer writing is disabled
    106     */
    107    if (ctx->Depth.Mask == flag)
    108       return;
    109 
    110    FLUSH_VERTICES(ctx, _NEW_DEPTH);
    111    ctx->Depth.Mask = flag;
    112 
    113    if (ctx->Driver.DepthMask)
    114       ctx->Driver.DepthMask( ctx, flag );
    115 }
    116 
    117 
    118 
    119 /**
    120  * Specified by the GL_EXT_depth_bounds_test extension.
    121  */
    122 void GLAPIENTRY
    123 _mesa_DepthBoundsEXT( GLclampd zmin, GLclampd zmax )
    124 {
    125    GET_CURRENT_CONTEXT(ctx);
    126 
    127    if (MESA_VERBOSE & VERBOSE_API)
    128       _mesa_debug(ctx, "glDepthBounds(%f, %f)\n", zmin, zmax);
    129 
    130    if (zmin > zmax) {
    131       _mesa_error(ctx, GL_INVALID_VALUE, "glDepthBoundsEXT(zmin > zmax)");
    132       return;
    133    }
    134 
    135    zmin = CLAMP(zmin, 0.0, 1.0);
    136    zmax = CLAMP(zmax, 0.0, 1.0);
    137 
    138    if (ctx->Depth.BoundsMin == zmin && ctx->Depth.BoundsMax == zmax)
    139       return;
    140 
    141    FLUSH_VERTICES(ctx, _NEW_DEPTH);
    142    ctx->Depth.BoundsMin = (GLfloat) zmin;
    143    ctx->Depth.BoundsMax = (GLfloat) zmax;
    144 }
    145 
    146 
    147 /**********************************************************************/
    148 /*****                      Initialization                        *****/
    149 /**********************************************************************/
    150 
    151 
    152 /**
    153  * Initialize the depth buffer attribute group in the given context.
    154  */
    155 void
    156 _mesa_init_depth(struct gl_context *ctx)
    157 {
    158    ctx->Depth.Test = GL_FALSE;
    159    ctx->Depth.Clear = 1.0;
    160    ctx->Depth.Func = GL_LESS;
    161    ctx->Depth.Mask = GL_TRUE;
    162 }
    163