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Member "mesa-20.1.8/src/gallium/drivers/llvmpipe/lp_bld_alpha.c" (16 Sep 2020, 3380 Bytes) of package /linux/misc/mesa-20.1.8.tar.xz:


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    1 /**************************************************************************
    2  *
    3  * Copyright 2009 VMware, Inc.
    4  * All Rights Reserved.
    5  *
    6  * Permission is hereby granted, free of charge, to any person obtaining a
    7  * copy of this software and associated documentation files (the
    8  * "Software"), to deal in the Software without restriction, including
    9  * without limitation the rights to use, copy, modify, merge, publish,
   10  * distribute, sub license, and/or sell copies of the Software, and to
   11  * permit persons to whom the Software is furnished to do so, subject to
   12  * the following conditions:
   13  *
   14  * The above copyright notice and this permission notice (including the
   15  * next paragraph) shall be included in all copies or substantial portions
   16  * of the Software.
   17  *
   18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
   21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
   22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
   23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
   24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   25  *
   26  **************************************************************************/
   27 
   28 /**
   29  * Alpha testing to LLVM IR translation.
   30  *
   31  * @author Jose Fonseca <jfonseca@vmware.com>
   32  */
   33 
   34 #include "pipe/p_state.h"
   35 #include "util/format/u_format.h"
   36 
   37 #include "gallivm/lp_bld_type.h"
   38 #include "gallivm/lp_bld_const.h"
   39 #include "gallivm/lp_bld_arit.h"
   40 #include "gallivm/lp_bld_conv.h"
   41 #include "gallivm/lp_bld_logic.h"
   42 #include "gallivm/lp_bld_flow.h"
   43 #include "gallivm/lp_bld_debug.h"
   44 
   45 #include "lp_bld_alpha.h"
   46 
   47 
   48 void
   49 lp_build_alpha_test(struct gallivm_state *gallivm,
   50                     unsigned func,
   51                     struct lp_type type,
   52                     const struct util_format_description *cbuf_format_desc,
   53                     struct lp_build_mask_context *mask,
   54                     LLVMValueRef alpha,
   55                     LLVMValueRef ref,
   56                     boolean do_branch)
   57 {
   58    struct lp_build_context bld;
   59    LLVMValueRef test;
   60 
   61    lp_build_context_init(&bld, gallivm, type);
   62 
   63    /*
   64     * Alpha testing needs to be done in the color buffer precision.
   65     *
   66     * TODO: Ideally, instead of duplicating the color conversion code, we would do
   67     * alpha testing after converting the output colors, but that's not very
   68     * convenient, because it needs to be done before depth testing.  Hopefully
   69     * LLVM will detect and remove the duplicate expression.
   70     *
   71     * FIXME: This should be generalized to formats other than rgba8 variants.
   72     */
   73    if (type.floating &&
   74        util_format_is_rgba8_variant(cbuf_format_desc)) {
   75       const unsigned dst_width = 8;
   76 
   77       alpha = lp_build_clamp(&bld, alpha, bld.zero, bld.one);
   78       ref   = lp_build_clamp(&bld, ref,   bld.zero, bld.one);
   79 
   80       alpha = lp_build_clamped_float_to_unsigned_norm(gallivm, type, dst_width, alpha);
   81       ref   = lp_build_clamped_float_to_unsigned_norm(gallivm, type, dst_width, ref);
   82 
   83       type.floating = 0;
   84       lp_build_context_init(&bld, gallivm, type);
   85    }
   86 
   87    test = lp_build_cmp(&bld, func, alpha, ref);
   88 
   89    lp_build_name(test, "alpha_mask");
   90 
   91    lp_build_mask_update(mask, test);
   92 
   93    if (do_branch)
   94       lp_build_mask_check(mask);
   95 }