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      1 /*
      2  * Mesa 3-D graphics library
      3  * Version:  7.1
      4  *
      5  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
      6  *
      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:
     13  *
     14  * The above copyright notice and this permission notice shall be included
     15  * in all copies or substantial portions of the Software.
     16  *
     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  * BRIAN PAUL 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.
     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    ASSERT_OUTSIDE_BEGIN_END(ctx);
     46 
     47    if (MESA_VERBOSE & VERBOSE_API)
     48       _mesa_debug(ctx, "glClearDepth(%f)\n", depth);
     49 
     50    depth = CLAMP( depth, 0.0, 1.0 );
     51 
     52    if (ctx->Depth.Clear == depth)
     53       return;
     54 
     55    FLUSH_VERTICES(ctx, _NEW_DEPTH);
     56    ctx->Depth.Clear = depth;
     57 }
     58 
     59 
     60 void GLAPIENTRY
     61 _mesa_ClearDepthf( GLclampf depth )
     62 {
     63    _mesa_ClearDepth(depth);
     64 }
     65 
     66 
     67 void GLAPIENTRY
     68 _mesa_DepthFunc( GLenum func )
     69 {
     70    GET_CURRENT_CONTEXT(ctx);
     71    ASSERT_OUTSIDE_BEGIN_END(ctx);
     72 
     73    if (MESA_VERBOSE & VERBOSE_API)
     74       _mesa_debug(ctx, "glDepthFunc %s\n", _mesa_lookup_enum_by_nr(func));
     75 
     76    switch (func) {
     77    case GL_LESS:    /* (default) pass if incoming z < stored z */
     78    case GL_GEQUAL:
     79    case GL_LEQUAL:
     80    case GL_GREATER:
     81    case GL_NOTEQUAL:
     82    case GL_EQUAL:
     83    case GL_ALWAYS:
     84    case GL_NEVER:
     85       break;
     86    default:
     87       _mesa_error( ctx, GL_INVALID_ENUM, "glDepth.Func" );
     88       return;
     89    }
     90 
     91    if (ctx->Depth.Func == func)
     92       return;
     93 
     94    FLUSH_VERTICES(ctx, _NEW_DEPTH);
     95    ctx->Depth.Func = func;
     96 
     97    if (ctx->Driver.DepthFunc)
     98       ctx->Driver.DepthFunc( ctx, func );
     99 }
    100 
    101 
    102 
    103 void GLAPIENTRY
    104 _mesa_DepthMask( GLboolean flag )
    105 {
    106    GET_CURRENT_CONTEXT(ctx);
    107    ASSERT_OUTSIDE_BEGIN_END(ctx);
    108 
    109    if (MESA_VERBOSE & VERBOSE_API)
    110       _mesa_debug(ctx, "glDepthMask %d\n", flag);
    111 
    112    /*
    113     * GL_TRUE indicates depth buffer writing is enabled (default)
    114     * GL_FALSE indicates depth buffer writing is disabled
    115     */
    116    if (ctx->Depth.Mask == flag)
    117       return;
    118 
    119    FLUSH_VERTICES(ctx, _NEW_DEPTH);
    120    ctx->Depth.Mask = flag;
    121 
    122    if (ctx->Driver.DepthMask)
    123       ctx->Driver.DepthMask( ctx, flag );
    124 }
    125 
    126 
    127 
    128 /**
    129  * Specified by the GL_EXT_depth_bounds_test extension.
    130  */
    131 void GLAPIENTRY
    132 _mesa_DepthBoundsEXT( GLclampd zmin, GLclampd zmax )
    133 {
    134    GET_CURRENT_CONTEXT(ctx);
    135    ASSERT_OUTSIDE_BEGIN_END(ctx);
    136 
    137    if (MESA_VERBOSE & VERBOSE_API)
    138       _mesa_debug(ctx, "glDepthBounds(%f, %f)\n", zmin, zmax);
    139 
    140    if (zmin > zmax) {
    141       _mesa_error(ctx, GL_INVALID_VALUE, "glDepthBoundsEXT(zmin > zmax)");
    142       return;
    143    }
    144 
    145    zmin = CLAMP(zmin, 0.0, 1.0);
    146    zmax = CLAMP(zmax, 0.0, 1.0);
    147 
    148    if (ctx->Depth.BoundsMin == zmin && ctx->Depth.BoundsMax == zmax)
    149       return;
    150 
    151    FLUSH_VERTICES(ctx, _NEW_DEPTH);
    152    ctx->Depth.BoundsMin = (GLfloat) zmin;
    153    ctx->Depth.BoundsMax = (GLfloat) zmax;
    154 }
    155 
    156 
    157 /**********************************************************************/
    158 /*****                      Initialization                        *****/
    159 /**********************************************************************/
    160 
    161 
    162 /**
    163  * Initialize the depth buffer attribute group in the given context.
    164  */
    165 void
    166 _mesa_init_depth(struct gl_context *ctx)
    167 {
    168    ctx->Depth.Test = GL_FALSE;
    169    ctx->Depth.Clear = 1.0;
    170    ctx->Depth.Func = GL_LESS;
    171    ctx->Depth.Mask = GL_TRUE;
    172 }
    173