/**************************************************************************
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*
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* Copyright 2009 VMware, Inc.
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* All Rights Reserved.
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*
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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
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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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
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/**
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* Alpha testing to LLVM IR translation.
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*
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* @author Jose Fonseca <jfonseca@vmware.com>
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*/
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#include "pipe/p_state.h"
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#include "util/u_format.h"
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#include "gallivm/lp_bld_type.h"
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#include "gallivm/lp_bld_const.h"
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#include "gallivm/lp_bld_arit.h"
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#include "gallivm/lp_bld_conv.h"
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#include "gallivm/lp_bld_logic.h"
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#include "gallivm/lp_bld_flow.h"
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#include "gallivm/lp_bld_debug.h"
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#include "lp_bld_alpha.h"
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void
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lp_build_alpha_test(struct gallivm_state *gallivm,
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unsigned func,
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struct lp_type type,
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const struct util_format_description *cbuf_format_desc,
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struct lp_build_mask_context *mask,
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LLVMValueRef alpha,
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LLVMValueRef ref,
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boolean do_branch)
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{
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struct lp_build_context bld;
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LLVMValueRef test;
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lp_build_context_init(&bld, gallivm, type);
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/*
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* Alpha testing needs to be done in the color buffer precision.
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*
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* TODO: Ideally, instead of duplicating the color conversion code, we would do
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* alpha testing after converting the output colors, but that's not very
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* convenient, because it needs to be done before depth testing. Hopefully
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* LLVM will detect and remove the duplicate expression.
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*
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* FIXME: This should be generalized to formats other than rgba8 variants.
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*/
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if (type.floating &&
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util_format_is_rgba8_variant(cbuf_format_desc)) {
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const unsigned dst_width = 8;
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alpha = lp_build_clamp(&bld, alpha, bld.zero, bld.one);
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ref = lp_build_clamp(&bld, ref, bld.zero, bld.one);
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alpha = lp_build_clamped_float_to_unsigned_norm(gallivm, type, dst_width, alpha);
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ref = lp_build_clamped_float_to_unsigned_norm(gallivm, type, dst_width, ref);
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type.floating = 0;
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lp_build_context_init(&bld, gallivm, type);
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}
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test = lp_build_cmp(&bld, func, alpha, ref);
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lp_build_name(test, "alpha_mask");
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lp_build_mask_update(mask, test);
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if (do_branch)
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lp_build_mask_check(mask);
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}
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