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* Mesa 3-D graphics library
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* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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_mesa_init_stencil( struct gl_context * ctx );
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/* From the GL 4.3 spec, 17.3.5:
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* "Stencil comparison operations and queries of <ref> clamp its value
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* to the range [0, 2^s-1], where <s> is the number of bits in the
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* stencil buffer attached to the draw framebuffer."
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_mesa_get_stencil_ref(struct gl_context const *ctx, int face)
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GLint stencilMax = (1 << ctx->DrawBuffer->Visual.stencilBits) - 1;
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GLint ref = ctx->Stencil.Ref[face];
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return CLAMP(ref, 0, stencilMax);
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_mesa_stencil_is_enabled(const struct gl_context *ctx)
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return ctx->Stencil.Enabled &&
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ctx->DrawBuffer->Visual.stencilBits > 0;
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_mesa_stencil_is_two_sided(const struct gl_context *ctx)
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const int face = ctx->Stencil._BackFace;
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return _mesa_stencil_is_enabled(ctx) &&
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(ctx->Stencil.Function[0] != ctx->Stencil.Function[face] ||
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ctx->Stencil.FailFunc[0] != ctx->Stencil.FailFunc[face] ||
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ctx->Stencil.ZPassFunc[0] != ctx->Stencil.ZPassFunc[face] ||
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ctx->Stencil.ZFailFunc[0] != ctx->Stencil.ZFailFunc[face] ||
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ctx->Stencil.Ref[0] != ctx->Stencil.Ref[face] ||
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ctx->Stencil.ValueMask[0] != ctx->Stencil.ValueMask[face] ||
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ctx->Stencil.WriteMask[0] != ctx->Stencil.WriteMask[face]);
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_mesa_stencil_is_write_enabled(const struct gl_context *ctx, bool is_two_sided)
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return _mesa_stencil_is_enabled(ctx) &&
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(ctx->Stencil.WriteMask[0] != 0 ||
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ctx->Stencil.WriteMask[ctx->Stencil._BackFace] != 0));