| 0,0 → 1,95 |
|---|
| /************************************************************************** |
| * |
| * Copyright 2009 VMware, Inc. |
| * All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sub license, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the |
| * next paragraph) shall be included in all copies or substantial portions |
| * of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
| * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR |
| * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| * |
| **************************************************************************/ |
| |
| /** |
| * Alpha testing to LLVM IR translation. |
| * |
| * @author Jose Fonseca <jfonseca@vmware.com> |
| */ |
| |
| #include "pipe/p_state.h" |
| #include "util/u_format.h" |
| |
| #include "gallivm/lp_bld_type.h" |
| #include "gallivm/lp_bld_const.h" |
| #include "gallivm/lp_bld_arit.h" |
| #include "gallivm/lp_bld_conv.h" |
| #include "gallivm/lp_bld_logic.h" |
| #include "gallivm/lp_bld_flow.h" |
| #include "gallivm/lp_bld_debug.h" |
| |
| #include "lp_bld_alpha.h" |
| |
| |
| void |
| lp_build_alpha_test(struct gallivm_state *gallivm, |
| unsigned func, |
| struct lp_type type, |
| const struct util_format_description *cbuf_format_desc, |
| struct lp_build_mask_context *mask, |
| LLVMValueRef alpha, |
| LLVMValueRef ref, |
| boolean do_branch) |
| { |
| struct lp_build_context bld; |
| LLVMValueRef test; |
| |
| lp_build_context_init(&bld, gallivm, type); |
| |
| /* |
| * Alpha testing needs to be done in the color buffer precision. |
| * |
| * TODO: Ideally, instead of duplicating the color conversion code, we would do |
| * alpha testing after converting the output colors, but that's not very |
| * convenient, because it needs to be done before depth testing. Hopefully |
| * LLVM will detect and remove the duplicate expression. |
| * |
| * FIXME: This should be generalized to formats other than rgba8 variants. |
| */ |
| if (type.floating && |
| util_format_is_rgba8_variant(cbuf_format_desc)) { |
| const unsigned dst_width = 8; |
| |
| alpha = lp_build_clamp(&bld, alpha, bld.zero, bld.one); |
| ref = lp_build_clamp(&bld, ref, bld.zero, bld.one); |
| |
| alpha = lp_build_clamped_float_to_unsigned_norm(gallivm, type, dst_width, alpha); |
| ref = lp_build_clamped_float_to_unsigned_norm(gallivm, type, dst_width, ref); |
| |
| type.floating = 0; |
| lp_build_context_init(&bld, gallivm, type); |
| } |
| |
| test = lp_build_cmp(&bld, func, alpha, ref); |
| |
| lp_build_name(test, "alpha_mask"); |
| |
| lp_build_mask_update(mask, test); |
| |
| if (do_branch) |
| lp_build_mask_check(mask); |
| } |