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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 |