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Now that we're working on lowered I/O, passing in the dual source blend colour via a sideband doesn't make any sense. The primary source blend colours are implicitly passed in as the sources of store_output intrinsics; likewise, we should get dual source blend colours from their respective stores. And since dual colours are only needed by blending, we can delete the stores as we go. That means nir_lower_blend now provides an all-in-one software lowering of dual source blending with no driver support needed! It even works for 8 dual-src render targets, but I don't have a use case for that. The only tricky bit here is making sure we are robust against different orders of store_output within the exit block. In particular, if we naively lower x = ... primary color = x y = ... dual color = y we end up emitting uses of y before it has been defined, something like x = ... primary color = blend(x, y) y = ... Instead, we remove dual stores and sink blend stores to the bottom of the block, so we end up with the correct x = ... y = ... primary color = blend(x, y) lower_io_to_temporaries ensures that the stores will be in the same (exit) block, so we don't need to sink further than that ourselves. Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com> Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21426>
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*
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* Copyright  2019 Alyssa Rosenzweig
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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 "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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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* 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 OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#ifndef NIR_BLEND_H
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#define NIR_BLEND_H
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#include "compiler/nir/nir.h"
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#include "util/format/u_formats.h"
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/* These structs encapsulates the blend state such that it can be lowered
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* cleanly
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*/
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typedef struct {
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enum blend_func func;
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enum blend_factor src_factor;
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bool invert_src_factor;
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enum blend_factor dst_factor;
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bool invert_dst_factor;
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} nir_lower_blend_channel;
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typedef struct {
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nir_lower_blend_channel rgb;
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nir_lower_blend_channel alpha;
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/* 4-bit colormask. 0x0 for none, 0xF for RGBA, 0x1 for R */
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unsigned colormask;
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} nir_lower_blend_rt;
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typedef struct {
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nir_lower_blend_rt rt[8];
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enum pipe_format format[8];
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bool logicop_enable;
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unsigned logicop_func;
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/* If set, will use load_blend_const_color_{r,g,b,a}_float instead of
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* load_blend_const_color_rgba */
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bool scalar_blend_const;
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} nir_lower_blend_options;
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void nir_lower_blend(nir_shader *shader,
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const nir_lower_blend_options *options);
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#endif
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