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| Rev | Author | Line No. | Line |
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| 55 | pj | 1 | /* $Id: depth.c,v 1.1 2003-02-28 11:41:59 pj Exp $ */ |
| 2 | |||
| 3 | /* |
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| 4 | * Mesa 3-D graphics library |
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| 5 | * Version: 4.1 |
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| 6 | * |
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| 7 | * Copyright (C) 1999-2002 Brian Paul All Rights Reserved. |
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| 8 | * |
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| 9 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 10 | * copy of this software and associated documentation files (the "Software"), |
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| 11 | * to deal in the Software without restriction, including without limitation |
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| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 13 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 14 | * Software is furnished to do so, subject to the following conditions: |
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| 15 | * |
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| 16 | * The above copyright notice and this permission notice shall be included |
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| 17 | * in all copies or substantial portions of the Software. |
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| 18 | * |
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | */ |
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| 26 | |||
| 27 | |||
| 28 | #include "glheader.h" |
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| 29 | #include "imports.h" |
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| 30 | #include "context.h" |
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| 31 | #include "enums.h" |
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| 32 | #include "depth.h" |
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| 33 | #include "macros.h" |
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| 34 | #include "mtypes.h" |
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| 35 | |||
| 36 | |||
| 37 | /**********************************************************************/ |
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| 38 | /***** API Functions *****/ |
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| 39 | /**********************************************************************/ |
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| 40 | |||
| 41 | |||
| 42 | |||
| 43 | void |
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| 44 | _mesa_ClearDepth( GLclampd depth ) |
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| 45 | { |
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| 46 | GET_CURRENT_CONTEXT(ctx); |
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| 47 | GLfloat tmp = (GLfloat) CLAMP( depth, 0.0, 1.0 ); |
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| 48 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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| 49 | |||
| 50 | if (ctx->Depth.Clear == tmp) |
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| 51 | return; |
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| 52 | |||
| 53 | FLUSH_VERTICES(ctx, _NEW_DEPTH); |
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| 54 | ctx->Depth.Clear = tmp; |
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| 55 | if (ctx->Driver.ClearDepth) |
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| 56 | (*ctx->Driver.ClearDepth)( ctx, ctx->Depth.Clear ); |
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| 57 | } |
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| 58 | |||
| 59 | |||
| 60 | |||
| 61 | void |
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| 62 | _mesa_DepthFunc( GLenum func ) |
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| 63 | { |
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| 64 | GET_CURRENT_CONTEXT(ctx); |
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| 65 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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| 66 | |||
| 67 | if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE)) |
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| 68 | _mesa_debug(ctx, "glDepthFunc %s\n", _mesa_lookup_enum_by_nr(func)); |
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| 69 | |||
| 70 | switch (func) { |
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| 71 | case GL_LESS: /* (default) pass if incoming z < stored z */ |
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| 72 | case GL_GEQUAL: |
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| 73 | case GL_LEQUAL: |
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| 74 | case GL_GREATER: |
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| 75 | case GL_NOTEQUAL: |
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| 76 | case GL_EQUAL: |
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| 77 | case GL_ALWAYS: |
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| 78 | case GL_NEVER: |
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| 79 | break; |
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| 80 | default: |
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| 81 | _mesa_error( ctx, GL_INVALID_ENUM, "glDepth.Func" ); |
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| 82 | return; |
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| 83 | } |
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| 84 | |||
| 85 | if (ctx->Depth.Func == func) |
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| 86 | return; |
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| 87 | |||
| 88 | FLUSH_VERTICES(ctx, _NEW_DEPTH); |
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| 89 | ctx->Depth.Func = func; |
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| 90 | |||
| 91 | if (ctx->Driver.DepthFunc) |
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| 92 | ctx->Driver.DepthFunc( ctx, func ); |
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| 93 | } |
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| 94 | |||
| 95 | |||
| 96 | |||
| 97 | void |
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| 98 | _mesa_DepthMask( GLboolean flag ) |
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| 99 | { |
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| 100 | GET_CURRENT_CONTEXT(ctx); |
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| 101 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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| 102 | |||
| 103 | if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE)) |
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| 104 | _mesa_debug(ctx, "glDepthMask %d\n", flag); |
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| 105 | |||
| 106 | /* |
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| 107 | * GL_TRUE indicates depth buffer writing is enabled (default) |
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| 108 | * GL_FALSE indicates depth buffer writing is disabled |
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| 109 | */ |
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| 110 | if (ctx->Depth.Mask == flag) |
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| 111 | return; |
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| 112 | |||
| 113 | FLUSH_VERTICES(ctx, _NEW_DEPTH); |
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| 114 | ctx->Depth.Mask = flag; |
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| 115 | |||
| 116 | if (ctx->Driver.DepthMask) |
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| 117 | ctx->Driver.DepthMask( ctx, flag ); |
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| 118 | } |