src/gallium/auxiliary/gallivm/lp_bld_alpha.c

   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
  36 #include "lp_bld_type.h"
  37 #include "lp_bld_const.h"
  38 #include "lp_bld_logic.h"
  39 #include "lp_bld_flow.h"
  40 #include "lp_bld_debug.h"
  41 #include "lp_bld_alpha.h"
  42
  43
  44 void
  45 lp_build_alpha_test(LLVMBuilderRef builder,
  46                     const struct pipe_alpha_state *state,
  47                     struct lp_type type,
  48                     struct lp_build_mask_context *mask,
  49                     LLVMValueRef alpha,
  50                     LLVMValueRef ref)
  51 {
  52    struct lp_build_context bld;
  53
  54    lp_build_context_init(&bld, builder, type);
  55
  56    if(state->enabled) {
  57       LLVMValueRef test = lp_build_cmp(&bld, state->func, alpha, ref);
  58
  59       lp_build_name(test, "alpha_mask");
  60
  61       lp_build_mask_update(mask, test);
  62    }
  63 }