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ShivaVG: Support for pseudo non-zero fillrule

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This commit is contained in:
Thomas Geymayer 2012-09-21 22:03:44 +02:00
parent 1b55076897
commit a25bd06138
1 changed files with 14 additions and 2 deletions
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12
simgear/canvas/ShivaVG/src/shPipeline.c
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@ -332,8 +332,20 @@ VG_API_CALL void vgDrawPath(VGPath path, VGbitfield paintModes)
/* Tesselate into stencil */
glEnable(GL_STENCIL_TEST);
if( context->fillRule == VG_EVEN_ODD )
{
glStencilFunc(GL_ALWAYS, 0, 0);
glStencilOp(GL_INVERT, GL_INVERT, GL_INVERT);
}
else
{
// pseudo non-zero fill rule. Fill everything at least covered once, don't
// care for possible decrements.
// TODO implement real non-zero fill-rule
glStencilFunc(GL_ALWAYS, 1, 1);
glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
}
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
shDrawVertices(p, GL_TRIANGLE_FAN);