/*
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* Copyright © 2015 Broadcom
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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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* Implements most of the fixed function fragment pipeline in shader code.
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*
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* VC4 doesn't have any hardware support for blending, alpha test, logic ops,
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* or color mask. Instead, you read the current contents of the destination
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* from the tile buffer after having waited for the scoreboard (which is
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* handled by vc4_qpu_emit.c), then do math using your output color and that
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* destination value, and update the output color appropriately.
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*
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* Once this pass is done, the color write will either have one component (for
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* single sample) with packed argb8888, or 4 components with the per-sample
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* argb8888 result.
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*/
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/**
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* Lowers fixed-function blending to a load of the destination color and a
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* series of ALU operations before the store of the output.
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*/
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#include "util/u_format.h"
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#include "vc4_qir.h"
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#include "compiler/nir/nir_builder.h"
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#include "vc4_context.h"
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static bool
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blend_depends_on_dst_color(struct vc4_compile *c)
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{
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return (c->fs_key->blend.blend_enable ||
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c->fs_key->blend.colormask != 0xf ||
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c->fs_key->logicop_func != PIPE_LOGICOP_COPY);
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}
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/** Emits a load of the previous fragment color from the tile buffer. */
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static nir_ssa_def *
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vc4_nir_get_dst_color(nir_builder *b, int sample)
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{
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nir_intrinsic_instr *load =
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nir_intrinsic_instr_create(b->shader,
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nir_intrinsic_load_input);
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load->num_components = 1;
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nir_intrinsic_set_base(load, VC4_NIR_TLB_COLOR_READ_INPUT + sample);
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load->src[0] = nir_src_for_ssa(nir_imm_int(b, 0));
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nir_ssa_dest_init(&load->instr, &load->dest, 1, 32, NULL);
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nir_builder_instr_insert(b, &load->instr);
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return &load->dest.ssa;
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}
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static nir_ssa_def *
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vc4_nir_srgb_decode(nir_builder *b, nir_ssa_def *srgb)
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{
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nir_ssa_def *is_low = nir_flt(b, srgb, nir_imm_float(b, 0.04045));
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nir_ssa_def *low = nir_fmul(b, srgb, nir_imm_float(b, 1.0 / 12.92));
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nir_ssa_def *high = nir_fpow(b,
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nir_fmul(b,
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nir_fadd(b, srgb,
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nir_imm_float(b, 0.055)),
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nir_imm_float(b, 1.0 / 1.055)),
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nir_imm_float(b, 2.4));
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return nir_bcsel(b, is_low, low, high);
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}
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static nir_ssa_def *
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vc4_nir_srgb_encode(nir_builder *b, nir_ssa_def *linear)
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{
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nir_ssa_def *is_low = nir_flt(b, linear, nir_imm_float(b, 0.0031308));
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nir_ssa_def *low = nir_fmul(b, linear, nir_imm_float(b, 12.92));
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nir_ssa_def *high = nir_fsub(b,
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nir_fmul(b,
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nir_imm_float(b, 1.055),
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nir_fpow(b,
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linear,
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nir_imm_float(b, 0.41666))),
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nir_imm_float(b, 0.055));
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return nir_bcsel(b, is_low, low, high);
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}
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static nir_ssa_def *
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vc4_blend_channel_f(nir_builder *b,
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nir_ssa_def **src,
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nir_ssa_def **dst,
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unsigned factor,
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int channel)
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{
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switch(factor) {
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case PIPE_BLENDFACTOR_ONE:
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return nir_imm_float(b, 1.0);
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case PIPE_BLENDFACTOR_SRC_COLOR:
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return src[channel];
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case PIPE_BLENDFACTOR_SRC_ALPHA:
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return src[3];
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case PIPE_BLENDFACTOR_DST_ALPHA:
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return dst[3];
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case PIPE_BLENDFACTOR_DST_COLOR:
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return dst[channel];
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case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
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if (channel != 3) {
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return nir_fmin(b,
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src[3],
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nir_fsub(b,
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nir_imm_float(b, 1.0),
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dst[3]));
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} else {
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return nir_imm_float(b, 1.0);
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}
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case PIPE_BLENDFACTOR_CONST_COLOR:
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return nir_load_system_value(b,
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nir_intrinsic_load_blend_const_color_r_float +
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channel,
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0);
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case PIPE_BLENDFACTOR_CONST_ALPHA:
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return nir_load_blend_const_color_a_float(b);
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case PIPE_BLENDFACTOR_ZERO:
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return nir_imm_float(b, 0.0);
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case PIPE_BLENDFACTOR_INV_SRC_COLOR:
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return nir_fsub(b, nir_imm_float(b, 1.0), src[channel]);
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case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
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return nir_fsub(b, nir_imm_float(b, 1.0), src[3]);
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case PIPE_BLENDFACTOR_INV_DST_ALPHA:
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return nir_fsub(b, nir_imm_float(b, 1.0), dst[3]);
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case PIPE_BLENDFACTOR_INV_DST_COLOR:
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return nir_fsub(b, nir_imm_float(b, 1.0), dst[channel]);
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case PIPE_BLENDFACTOR_INV_CONST_COLOR:
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return nir_fsub(b, nir_imm_float(b, 1.0),
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nir_load_system_value(b,
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nir_intrinsic_load_blend_const_color_r_float +
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channel,
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0));
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case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
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return nir_fsub(b, nir_imm_float(b, 1.0),
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nir_load_blend_const_color_a_float(b));
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default:
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case PIPE_BLENDFACTOR_SRC1_COLOR:
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case PIPE_BLENDFACTOR_SRC1_ALPHA:
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case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
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case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
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/* Unsupported. */
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fprintf(stderr, "Unknown blend factor %d\n", factor);
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return nir_imm_float(b, 1.0);
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}
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}
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static nir_ssa_def *
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vc4_nir_set_packed_chan(nir_builder *b, nir_ssa_def *src0, nir_ssa_def *src1,
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int chan)
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{
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unsigned chan_mask = 0xff << (chan * 8);
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return nir_ior(b,
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nir_iand(b, src0, nir_imm_int(b, ~chan_mask)),
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nir_iand(b, src1, nir_imm_int(b, chan_mask)));
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}
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static nir_ssa_def *
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vc4_blend_channel_i(nir_builder *b,
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nir_ssa_def *src,
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nir_ssa_def *dst,
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nir_ssa_def *src_a,
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nir_ssa_def *dst_a,
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unsigned factor,
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int a_chan)
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{
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switch (factor) {
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case PIPE_BLENDFACTOR_ONE:
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return nir_imm_int(b, ~0);
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case PIPE_BLENDFACTOR_SRC_COLOR:
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return src;
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case PIPE_BLENDFACTOR_SRC_ALPHA:
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return src_a;
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case PIPE_BLENDFACTOR_DST_ALPHA:
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return dst_a;
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case PIPE_BLENDFACTOR_DST_COLOR:
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return dst;
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case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
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return vc4_nir_set_packed_chan(b,
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nir_umin_4x8(b,
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src_a,
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nir_inot(b, dst_a)),
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nir_imm_int(b, ~0),
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a_chan);
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case PIPE_BLENDFACTOR_CONST_COLOR:
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return nir_load_blend_const_color_rgba8888_unorm(b);
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case PIPE_BLENDFACTOR_CONST_ALPHA:
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return nir_load_blend_const_color_aaaa8888_unorm(b);
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case PIPE_BLENDFACTOR_ZERO:
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return nir_imm_int(b, 0);
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case PIPE_BLENDFACTOR_INV_SRC_COLOR:
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return nir_inot(b, src);
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case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
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return nir_inot(b, src_a);
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case PIPE_BLENDFACTOR_INV_DST_ALPHA:
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return nir_inot(b, dst_a);
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case PIPE_BLENDFACTOR_INV_DST_COLOR:
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return nir_inot(b, dst);
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case PIPE_BLENDFACTOR_INV_CONST_COLOR:
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return nir_inot(b,
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nir_load_blend_const_color_rgba8888_unorm(b));
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case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
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return nir_inot(b,
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nir_load_blend_const_color_aaaa8888_unorm(b));
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default:
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case PIPE_BLENDFACTOR_SRC1_COLOR:
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case PIPE_BLENDFACTOR_SRC1_ALPHA:
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case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
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case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
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/* Unsupported. */
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fprintf(stderr, "Unknown blend factor %d\n", factor);
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return nir_imm_int(b, ~0);
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}
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}
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static nir_ssa_def *
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vc4_blend_func_f(nir_builder *b, nir_ssa_def *src, nir_ssa_def *dst,
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unsigned func)
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{
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switch (func) {
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case PIPE_BLEND_ADD:
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return nir_fadd(b, src, dst);
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case PIPE_BLEND_SUBTRACT:
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return nir_fsub(b, src, dst);
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case PIPE_BLEND_REVERSE_SUBTRACT:
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return nir_fsub(b, dst, src);
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case PIPE_BLEND_MIN:
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return nir_fmin(b, src, dst);
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case PIPE_BLEND_MAX:
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return nir_fmax(b, src, dst);
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default:
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/* Unsupported. */
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fprintf(stderr, "Unknown blend func %d\n", func);
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return src;
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}
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}
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static nir_ssa_def *
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vc4_blend_func_i(nir_builder *b, nir_ssa_def *src, nir_ssa_def *dst,
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unsigned func)
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{
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switch (func) {
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case PIPE_BLEND_ADD:
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return nir_usadd_4x8(b, src, dst);
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case PIPE_BLEND_SUBTRACT:
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return nir_ussub_4x8(b, src, dst);
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case PIPE_BLEND_REVERSE_SUBTRACT:
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return nir_ussub_4x8(b, dst, src);
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case PIPE_BLEND_MIN:
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return nir_umin_4x8(b, src, dst);
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case PIPE_BLEND_MAX:
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return nir_umax_4x8(b, src, dst);
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default:
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/* Unsupported. */
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fprintf(stderr, "Unknown blend func %d\n", func);
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return src;
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}
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}
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static void
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vc4_do_blending_f(struct vc4_compile *c, nir_builder *b, nir_ssa_def **result,
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nir_ssa_def **src_color, nir_ssa_def **dst_color)
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{
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struct pipe_rt_blend_state *blend = &c->fs_key->blend;
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if (!blend->blend_enable) {
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for (int i = 0; i < 4; i++)
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result[i] = src_color[i];
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return;
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}
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/* Clamp the src color to [0, 1]. Dest is already clamped. */
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for (int i = 0; i < 4; i++)
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src_color[i] = nir_fsat(b, src_color[i]);
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nir_ssa_def *src_blend[4], *dst_blend[4];
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for (int i = 0; i < 4; i++) {
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int src_factor = ((i != 3) ? blend->rgb_src_factor :
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blend->alpha_src_factor);
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int dst_factor = ((i != 3) ? blend->rgb_dst_factor :
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blend->alpha_dst_factor);
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src_blend[i] = nir_fmul(b, src_color[i],
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vc4_blend_channel_f(b,
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src_color, dst_color,
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src_factor, i));
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dst_blend[i] = nir_fmul(b, dst_color[i],
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vc4_blend_channel_f(b,
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src_color, dst_color,
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dst_factor, i));
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}
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for (int i = 0; i < 4; i++) {
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result[i] = vc4_blend_func_f(b, src_blend[i], dst_blend[i],
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((i != 3) ? blend->rgb_func :
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blend->alpha_func));
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}
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}
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static nir_ssa_def *
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vc4_nir_splat(nir_builder *b, nir_ssa_def *src)
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{
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nir_ssa_def *or1 = nir_ior(b, src, nir_ishl(b, src, nir_imm_int(b, 8)));
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return nir_ior(b, or1, nir_ishl(b, or1, nir_imm_int(b, 16)));
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}
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static nir_ssa_def *
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vc4_do_blending_i(struct vc4_compile *c, nir_builder *b,
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nir_ssa_def *src_color, nir_ssa_def *dst_color,
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nir_ssa_def *src_float_a)
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{
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struct pipe_rt_blend_state *blend = &c->fs_key->blend;
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if (!blend->blend_enable)
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return src_color;
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enum pipe_format color_format = c->fs_key->color_format;
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const uint8_t *format_swiz = vc4_get_format_swizzle(color_format);
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nir_ssa_def *imm_0xff = nir_imm_int(b, 0xff);
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nir_ssa_def *src_a = nir_pack_unorm_4x8(b, src_float_a);
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nir_ssa_def *dst_a;
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int alpha_chan;
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for (alpha_chan = 0; alpha_chan < 4; alpha_chan++) {
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if (format_swiz[alpha_chan] == 3)
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break;
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}
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if (alpha_chan != 4) {
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nir_ssa_def *shift = nir_imm_int(b, alpha_chan * 8);
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dst_a = vc4_nir_splat(b, nir_iand(b, nir_ushr(b, dst_color,
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shift), imm_0xff));
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} else {
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dst_a = nir_imm_int(b, ~0);
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}
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nir_ssa_def *src_factor = vc4_blend_channel_i(b,
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src_color, dst_color,
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src_a, dst_a,
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blend->rgb_src_factor,
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alpha_chan);
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nir_ssa_def *dst_factor = vc4_blend_channel_i(b,
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src_color, dst_color,
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src_a, dst_a,
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blend->rgb_dst_factor,
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alpha_chan);
|
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if (alpha_chan != 4 &&
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blend->alpha_src_factor != blend->rgb_src_factor) {
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nir_ssa_def *src_alpha_factor =
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vc4_blend_channel_i(b,
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src_color, dst_color,
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src_a, dst_a,
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blend->alpha_src_factor,
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alpha_chan);
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src_factor = vc4_nir_set_packed_chan(b, src_factor,
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src_alpha_factor,
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alpha_chan);
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}
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if (alpha_chan != 4 &&
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blend->alpha_dst_factor != blend->rgb_dst_factor) {
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nir_ssa_def *dst_alpha_factor =
|
vc4_blend_channel_i(b,
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src_color, dst_color,
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src_a, dst_a,
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blend->alpha_dst_factor,
|
alpha_chan);
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dst_factor = vc4_nir_set_packed_chan(b, dst_factor,
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dst_alpha_factor,
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alpha_chan);
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}
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nir_ssa_def *src_blend = nir_umul_unorm_4x8(b, src_color, src_factor);
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nir_ssa_def *dst_blend = nir_umul_unorm_4x8(b, dst_color, dst_factor);
|
|
nir_ssa_def *result =
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vc4_blend_func_i(b, src_blend, dst_blend, blend->rgb_func);
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if (alpha_chan != 4 && blend->alpha_func != blend->rgb_func) {
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nir_ssa_def *result_a = vc4_blend_func_i(b,
|
src_blend,
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dst_blend,
|
blend->alpha_func);
|
result = vc4_nir_set_packed_chan(b, result, result_a,
|
alpha_chan);
|
}
|
return result;
|
}
|
|
static nir_ssa_def *
|
vc4_logicop(nir_builder *b, int logicop_func,
|
nir_ssa_def *src, nir_ssa_def *dst)
|
{
|
switch (logicop_func) {
|
case PIPE_LOGICOP_CLEAR:
|
return nir_imm_int(b, 0);
|
case PIPE_LOGICOP_NOR:
|
return nir_inot(b, nir_ior(b, src, dst));
|
case PIPE_LOGICOP_AND_INVERTED:
|
return nir_iand(b, nir_inot(b, src), dst);
|
case PIPE_LOGICOP_COPY_INVERTED:
|
return nir_inot(b, src);
|
case PIPE_LOGICOP_AND_REVERSE:
|
return nir_iand(b, src, nir_inot(b, dst));
|
case PIPE_LOGICOP_INVERT:
|
return nir_inot(b, dst);
|
case PIPE_LOGICOP_XOR:
|
return nir_ixor(b, src, dst);
|
case PIPE_LOGICOP_NAND:
|
return nir_inot(b, nir_iand(b, src, dst));
|
case PIPE_LOGICOP_AND:
|
return nir_iand(b, src, dst);
|
case PIPE_LOGICOP_EQUIV:
|
return nir_inot(b, nir_ixor(b, src, dst));
|
case PIPE_LOGICOP_NOOP:
|
return dst;
|
case PIPE_LOGICOP_OR_INVERTED:
|
return nir_ior(b, nir_inot(b, src), dst);
|
case PIPE_LOGICOP_OR_REVERSE:
|
return nir_ior(b, src, nir_inot(b, dst));
|
case PIPE_LOGICOP_OR:
|
return nir_ior(b, src, dst);
|
case PIPE_LOGICOP_SET:
|
return nir_imm_int(b, ~0);
|
default:
|
fprintf(stderr, "Unknown logic op %d\n", logicop_func);
|
/* FALLTHROUGH */
|
case PIPE_LOGICOP_COPY:
|
return src;
|
}
|
}
|
|
static nir_ssa_def *
|
vc4_nir_swizzle_and_pack(struct vc4_compile *c, nir_builder *b,
|
nir_ssa_def **colors)
|
{
|
enum pipe_format color_format = c->fs_key->color_format;
|
const uint8_t *format_swiz = vc4_get_format_swizzle(color_format);
|
|
nir_ssa_def *swizzled[4];
|
for (int i = 0; i < 4; i++) {
|
swizzled[i] = vc4_nir_get_swizzled_channel(b, colors,
|
format_swiz[i]);
|
}
|
|
return nir_pack_unorm_4x8(b,
|
nir_vec4(b,
|
swizzled[0], swizzled[1],
|
swizzled[2], swizzled[3]));
|
|
}
|
|
static nir_ssa_def *
|
vc4_nir_blend_pipeline(struct vc4_compile *c, nir_builder *b, nir_ssa_def *src,
|
int sample)
|
{
|
enum pipe_format color_format = c->fs_key->color_format;
|
const uint8_t *format_swiz = vc4_get_format_swizzle(color_format);
|
bool srgb = util_format_is_srgb(color_format);
|
|
/* Pull out the float src/dst color components. */
|
nir_ssa_def *packed_dst_color = vc4_nir_get_dst_color(b, sample);
|
nir_ssa_def *dst_vec4 = nir_unpack_unorm_4x8(b, packed_dst_color);
|
nir_ssa_def *src_color[4], *unpacked_dst_color[4];
|
for (unsigned i = 0; i < 4; i++) {
|
src_color[i] = nir_channel(b, src, i);
|
unpacked_dst_color[i] = nir_channel(b, dst_vec4, i);
|
}
|
|
if (c->fs_key->sample_alpha_to_one && c->fs_key->msaa)
|
src_color[3] = nir_imm_float(b, 1.0);
|
|
nir_ssa_def *packed_color;
|
if (srgb) {
|
/* Unswizzle the destination color. */
|
nir_ssa_def *dst_color[4];
|
for (unsigned i = 0; i < 4; i++) {
|
dst_color[i] = vc4_nir_get_swizzled_channel(b,
|
unpacked_dst_color,
|
format_swiz[i]);
|
}
|
|
/* Turn dst color to linear. */
|
for (int i = 0; i < 3; i++)
|
dst_color[i] = vc4_nir_srgb_decode(b, dst_color[i]);
|
|
nir_ssa_def *blend_color[4];
|
vc4_do_blending_f(c, b, blend_color, src_color, dst_color);
|
|
/* sRGB encode the output color */
|
for (int i = 0; i < 3; i++)
|
blend_color[i] = vc4_nir_srgb_encode(b, blend_color[i]);
|
|
packed_color = vc4_nir_swizzle_and_pack(c, b, blend_color);
|
} else {
|
nir_ssa_def *packed_src_color =
|
vc4_nir_swizzle_and_pack(c, b, src_color);
|
|
packed_color =
|
vc4_do_blending_i(c, b,
|
packed_src_color, packed_dst_color,
|
src_color[3]);
|
}
|
|
packed_color = vc4_logicop(b, c->fs_key->logicop_func,
|
packed_color, packed_dst_color);
|
|
/* If the bit isn't set in the color mask, then just return the
|
* original dst color, instead.
|
*/
|
uint32_t colormask = 0xffffffff;
|
for (int i = 0; i < 4; i++) {
|
if (format_swiz[i] < 4 &&
|
!(c->fs_key->blend.colormask & (1 << format_swiz[i]))) {
|
colormask &= ~(0xff << (i * 8));
|
}
|
}
|
|
return nir_ior(b,
|
nir_iand(b, packed_color,
|
nir_imm_int(b, colormask)),
|
nir_iand(b, packed_dst_color,
|
nir_imm_int(b, ~colormask)));
|
}
|
|
static int
|
vc4_nir_next_output_driver_location(nir_shader *s)
|
{
|
int maxloc = -1;
|
|
nir_foreach_variable(var, &s->outputs)
|
maxloc = MAX2(maxloc, (int)var->data.driver_location);
|
|
return maxloc + 1;
|
}
|
|
static void
|
vc4_nir_store_sample_mask(struct vc4_compile *c, nir_builder *b,
|
nir_ssa_def *val)
|
{
|
nir_variable *sample_mask = nir_variable_create(c->s, nir_var_shader_out,
|
glsl_uint_type(),
|
"sample_mask");
|
sample_mask->data.driver_location =
|
vc4_nir_next_output_driver_location(c->s);
|
sample_mask->data.location = FRAG_RESULT_SAMPLE_MASK;
|
|
nir_intrinsic_instr *intr =
|
nir_intrinsic_instr_create(c->s, nir_intrinsic_store_output);
|
intr->num_components = 1;
|
nir_intrinsic_set_base(intr, sample_mask->data.driver_location);
|
|
intr->src[0] = nir_src_for_ssa(val);
|
intr->src[1] = nir_src_for_ssa(nir_imm_int(b, 0));
|
nir_builder_instr_insert(b, &intr->instr);
|
}
|
|
static void
|
vc4_nir_lower_blend_instr(struct vc4_compile *c, nir_builder *b,
|
nir_intrinsic_instr *intr)
|
{
|
nir_ssa_def *frag_color = intr->src[0].ssa;
|
|
if (c->fs_key->sample_alpha_to_coverage) {
|
nir_ssa_def *a = nir_channel(b, frag_color, 3);
|
|
/* XXX: We should do a nice dither based on the fragment
|
* coordinate, instead.
|
*/
|
nir_ssa_def *num_samples = nir_imm_float(b, VC4_MAX_SAMPLES);
|
nir_ssa_def *num_bits = nir_f2i32(b, nir_fmul(b, a, num_samples));
|
nir_ssa_def *bitmask = nir_isub(b,
|
nir_ishl(b,
|
nir_imm_int(b, 1),
|
num_bits),
|
nir_imm_int(b, 1));
|
vc4_nir_store_sample_mask(c, b, bitmask);
|
}
|
|
/* The TLB color read returns each sample in turn, so if our blending
|
* depends on the destination color, we're going to have to run the
|
* blending function separately for each destination sample value, and
|
* then output the per-sample color using TLB_COLOR_MS.
|
*/
|
nir_ssa_def *blend_output;
|
if (c->fs_key->msaa && blend_depends_on_dst_color(c)) {
|
c->msaa_per_sample_output = true;
|
|
nir_ssa_def *samples[4];
|
for (int i = 0; i < VC4_MAX_SAMPLES; i++)
|
samples[i] = vc4_nir_blend_pipeline(c, b, frag_color, i);
|
blend_output = nir_vec4(b,
|
samples[0], samples[1],
|
samples[2], samples[3]);
|
} else {
|
blend_output = vc4_nir_blend_pipeline(c, b, frag_color, 0);
|
}
|
|
nir_instr_rewrite_src(&intr->instr, &intr->src[0],
|
nir_src_for_ssa(blend_output));
|
intr->num_components = blend_output->num_components;
|
}
|
|
static bool
|
vc4_nir_lower_blend_block(nir_block *block, struct vc4_compile *c)
|
{
|
nir_foreach_instr_safe(instr, block) {
|
if (instr->type != nir_instr_type_intrinsic)
|
continue;
|
nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
|
if (intr->intrinsic != nir_intrinsic_store_output)
|
continue;
|
|
nir_variable *output_var = NULL;
|
nir_foreach_variable(var, &c->s->outputs) {
|
if (var->data.driver_location ==
|
nir_intrinsic_base(intr)) {
|
output_var = var;
|
break;
|
}
|
}
|
assert(output_var);
|
|
if (output_var->data.location != FRAG_RESULT_COLOR &&
|
output_var->data.location != FRAG_RESULT_DATA0) {
|
continue;
|
}
|
|
nir_function_impl *impl =
|
nir_cf_node_get_function(&block->cf_node);
|
nir_builder b;
|
nir_builder_init(&b, impl);
|
b.cursor = nir_before_instr(&intr->instr);
|
vc4_nir_lower_blend_instr(c, &b, intr);
|
}
|
return true;
|
}
|
|
void
|
vc4_nir_lower_blend(nir_shader *s, struct vc4_compile *c)
|
{
|
nir_foreach_function(function, s) {
|
if (function->impl) {
|
nir_foreach_block(block, function->impl) {
|
vc4_nir_lower_blend_block(block, c);
|
}
|
|
nir_metadata_preserve(function->impl,
|
nir_metadata_block_index |
|
nir_metadata_dominance);
|
}
|
}
|
|
/* If we didn't do alpha-to-coverage on the output color, we still
|
* need to pass glSampleMask() through.
|
*/
|
if (c->fs_key->sample_coverage && !c->fs_key->sample_alpha_to_coverage) {
|
nir_function_impl *impl = nir_shader_get_entrypoint(s);
|
nir_builder b;
|
nir_builder_init(&b, impl);
|
b.cursor = nir_after_block(nir_impl_last_block(impl));
|
|
vc4_nir_store_sample_mask(c, &b, nir_load_sample_mask_in(&b));
|
}
|
}
|
