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| Rev | Author | Line No. | Line |
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| 55 | pj | 1 | /* $Id: stencil.c,v 1.1 2003-02-28 11:42:04 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 "depth.h" |
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| 32 | #include "macros.h" |
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| 33 | #include "stencil.h" |
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| 34 | #include "mtypes.h" |
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| 35 | #include "enable.h" |
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| 36 | |||
| 37 | |||
| 38 | void |
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| 39 | _mesa_ClearStencil( GLint s ) |
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| 40 | { |
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| 41 | GET_CURRENT_CONTEXT(ctx); |
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| 42 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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| 43 | |||
| 44 | if (ctx->Stencil.Clear == (GLstencil) s) |
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| 45 | return; |
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| 46 | |||
| 47 | FLUSH_VERTICES(ctx, _NEW_STENCIL); |
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| 48 | ctx->Stencil.Clear = (GLstencil) s; |
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| 49 | |||
| 50 | if (ctx->Driver.ClearStencil) { |
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| 51 | (*ctx->Driver.ClearStencil)( ctx, s ); |
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| 52 | } |
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| 53 | } |
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| 54 | |||
| 55 | |||
| 56 | |||
| 57 | void |
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| 58 | _mesa_StencilFunc( GLenum func, GLint ref, GLuint mask ) |
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| 59 | { |
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| 60 | GET_CURRENT_CONTEXT(ctx); |
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| 61 | const GLint face = ctx->Stencil.ActiveFace; |
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| 62 | GLint maxref; |
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| 63 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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| 64 | |||
| 65 | switch (func) { |
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| 66 | case GL_NEVER: |
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| 67 | case GL_LESS: |
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| 68 | case GL_LEQUAL: |
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| 69 | case GL_GREATER: |
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| 70 | case GL_GEQUAL: |
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| 71 | case GL_EQUAL: |
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| 72 | case GL_NOTEQUAL: |
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| 73 | case GL_ALWAYS: |
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| 74 | break; |
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| 75 | default: |
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| 76 | _mesa_error( ctx, GL_INVALID_ENUM, "glStencilFunc" ); |
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| 77 | return; |
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| 78 | } |
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| 79 | |||
| 80 | maxref = (1 << STENCIL_BITS) - 1; |
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| 81 | ref = (GLstencil) CLAMP( ref, 0, maxref ); |
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| 82 | |||
| 83 | if (ctx->Stencil.Function[face] == func && |
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| 84 | ctx->Stencil.ValueMask[face] == (GLstencil) mask && |
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| 85 | ctx->Stencil.Ref[face] == ref) |
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| 86 | return; |
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| 87 | |||
| 88 | FLUSH_VERTICES(ctx, _NEW_STENCIL); |
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| 89 | ctx->Stencil.Function[face] = func; |
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| 90 | ctx->Stencil.Ref[face] = ref; |
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| 91 | ctx->Stencil.ValueMask[face] = (GLstencil) mask; |
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| 92 | |||
| 93 | if (ctx->Driver.StencilFunc) { |
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| 94 | (*ctx->Driver.StencilFunc)( ctx, func, ref, mask ); |
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| 95 | } |
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| 96 | } |
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| 97 | |||
| 98 | |||
| 99 | |||
| 100 | void |
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| 101 | _mesa_StencilMask( GLuint mask ) |
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| 102 | { |
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| 103 | GET_CURRENT_CONTEXT(ctx); |
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| 104 | const GLint face = ctx->Stencil.ActiveFace; |
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| 105 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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| 106 | |||
| 107 | if (ctx->Stencil.WriteMask[face] == (GLstencil) mask) |
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| 108 | return; |
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| 109 | |||
| 110 | FLUSH_VERTICES(ctx, _NEW_STENCIL); |
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| 111 | ctx->Stencil.WriteMask[face] = (GLstencil) mask; |
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| 112 | |||
| 113 | if (ctx->Driver.StencilMask) { |
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| 114 | (*ctx->Driver.StencilMask)( ctx, mask ); |
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| 115 | } |
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| 116 | } |
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| 117 | |||
| 118 | |||
| 119 | |||
| 120 | void |
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| 121 | _mesa_StencilOp(GLenum fail, GLenum zfail, GLenum zpass) |
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| 122 | { |
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| 123 | GET_CURRENT_CONTEXT(ctx); |
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| 124 | const GLint face = ctx->Stencil.ActiveFace; |
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| 125 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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| 126 | |||
| 127 | switch (fail) { |
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| 128 | case GL_KEEP: |
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| 129 | case GL_ZERO: |
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| 130 | case GL_REPLACE: |
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| 131 | case GL_INCR: |
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| 132 | case GL_DECR: |
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| 133 | case GL_INVERT: |
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| 134 | break; |
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| 135 | case GL_INCR_WRAP_EXT: |
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| 136 | case GL_DECR_WRAP_EXT: |
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| 137 | if (!ctx->Extensions.EXT_stencil_wrap) { |
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| 138 | break; |
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| 139 | } |
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| 140 | /* FALL-THROUGH */ |
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| 141 | default: |
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| 142 | _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp"); |
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| 143 | return; |
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| 144 | } |
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| 145 | switch (zfail) { |
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| 146 | case GL_KEEP: |
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| 147 | case GL_ZERO: |
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| 148 | case GL_REPLACE: |
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| 149 | case GL_INCR: |
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| 150 | case GL_DECR: |
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| 151 | case GL_INVERT: |
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| 152 | break; |
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| 153 | case GL_INCR_WRAP_EXT: |
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| 154 | case GL_DECR_WRAP_EXT: |
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| 155 | if (ctx->Extensions.EXT_stencil_wrap) { |
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| 156 | break; |
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| 157 | } |
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| 158 | /* FALL-THROUGH */ |
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| 159 | default: |
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| 160 | _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp"); |
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| 161 | return; |
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| 162 | } |
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| 163 | switch (zpass) { |
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| 164 | case GL_KEEP: |
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| 165 | case GL_ZERO: |
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| 166 | case GL_REPLACE: |
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| 167 | case GL_INCR: |
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| 168 | case GL_DECR: |
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| 169 | case GL_INVERT: |
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| 170 | break; |
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| 171 | case GL_INCR_WRAP_EXT: |
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| 172 | case GL_DECR_WRAP_EXT: |
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| 173 | if (ctx->Extensions.EXT_stencil_wrap) { |
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| 174 | break; |
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| 175 | } |
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| 176 | /* FALL-THROUGH */ |
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| 177 | default: |
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| 178 | _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp"); |
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| 179 | return; |
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| 180 | } |
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| 181 | |||
| 182 | if (ctx->Stencil.ZFailFunc[face] == zfail && |
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| 183 | ctx->Stencil.ZPassFunc[face] == zpass && |
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| 184 | ctx->Stencil.FailFunc[face] == fail) |
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| 185 | return; |
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| 186 | |||
| 187 | FLUSH_VERTICES(ctx, _NEW_STENCIL); |
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| 188 | ctx->Stencil.ZFailFunc[face] = zfail; |
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| 189 | ctx->Stencil.ZPassFunc[face] = zpass; |
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| 190 | ctx->Stencil.FailFunc[face] = fail; |
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| 191 | |||
| 192 | if (ctx->Driver.StencilOp) { |
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| 193 | (*ctx->Driver.StencilOp)(ctx, fail, zfail, zpass); |
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| 194 | } |
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| 195 | } |
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| 196 | |||
| 197 | |||
| 198 | /* GL_EXT_stencil_two_side */ |
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| 199 | void |
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| 200 | _mesa_ActiveStencilFaceEXT(GLenum face) |
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| 201 | { |
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| 202 | GET_CURRENT_CONTEXT(ctx); |
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| 203 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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| 204 | |||
| 205 | if (face == GL_FRONT || face == GL_BACK) { |
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| 206 | FLUSH_VERTICES(ctx, _NEW_STENCIL); |
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| 207 | ctx->Stencil.ActiveFace = (face == GL_FRONT) ? 0 : 1; |
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| 208 | } |
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| 209 | |||
| 210 | if (ctx->Driver.ActiveStencilFace) { |
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| 211 | (*ctx->Driver.ActiveStencilFace)( ctx, (GLuint) ctx->Stencil.ActiveFace ); |
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| 212 | } |
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| 213 | } |
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| 214 |