diff options
| -rw-r--r-- | src/gallium/drivers/panfrost/meson.build | 1 | ||||
| -rw-r--r-- | src/gallium/drivers/panfrost/midgard/nir_lower_blend.c | 247 | ||||
| -rw-r--r-- | src/gallium/drivers/panfrost/midgard/nir_lower_blend.h | 56 | ||||
| -rw-r--r-- | src/gallium/drivers/panfrost/pan_blend_shaders.c | 2 |
4 files changed, 305 insertions, 1 deletions
diff --git a/src/gallium/drivers/panfrost/meson.build b/src/gallium/drivers/panfrost/meson.build index 65db4006e50..93640a29c4c 100644 --- a/src/gallium/drivers/panfrost/meson.build +++ b/src/gallium/drivers/panfrost/meson.build @@ -27,6 +27,7 @@ files_panfrost = files( 'pan_resource.h', 'midgard/midgard_compile.c', + 'midgard/nir_lower_blend.c', 'midgard/cppwrap.cpp', 'midgard/disassemble.c', diff --git a/src/gallium/drivers/panfrost/midgard/nir_lower_blend.c b/src/gallium/drivers/panfrost/midgard/nir_lower_blend.c new file mode 100644 index 00000000000..7a7f0ebabd7 --- /dev/null +++ b/src/gallium/drivers/panfrost/midgard/nir_lower_blend.c @@ -0,0 +1,247 @@ +/* + * Copyright (C) 2019 Alyssa Rosenzweig + * + * 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, sublicense, + * 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 NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS 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. + */ + +/** + * @file + * + * Implements the fragment pipeline (blending and writeout) in software, to be + * run as a dedicated "blend shader" stage on Midgard/Bifrost, or as a fragment + * shader variant on typical GPUs. This pass is useful if hardware lacks + * fixed-function blending in part or in full. + */ + +#include "compiler/nir/nir.h" +#include "compiler/nir/nir_builder.h" +#include "nir_lower_blend.h" + +/* Given processed factors, combine them per a blend function */ + +static nir_ssa_def * +nir_blend_func( + nir_builder *b, + enum blend_func func, + nir_ssa_def *src, nir_ssa_def *dst) +{ + switch (func) { + case BLEND_FUNC_ADD: + return nir_fadd(b, src, dst); + case BLEND_FUNC_SUBTRACT: + return nir_fsub(b, src, dst); + case BLEND_FUNC_REVERSE_SUBTRACT: + return nir_fsub(b, dst, src); + case BLEND_FUNC_MIN: + return nir_fmin(b, src, dst); + case BLEND_FUNC_MAX: + return nir_fmax(b, src, dst); + } + + unreachable("Invalid blend function"); +} + +/* Does this blend function multiply by a blend factor? */ + +static bool +nir_blend_factored(enum blend_func func) +{ + switch (func) { + case BLEND_FUNC_ADD: + case BLEND_FUNC_SUBTRACT: + case BLEND_FUNC_REVERSE_SUBTRACT: + return true; + default: + return false; + } +} + +/* Compute a src_alpha_saturate factor */ +static nir_ssa_def * +nir_alpha_saturate( + nir_builder *b, + nir_ssa_def *src, nir_ssa_def *dst, + unsigned chan) +{ + nir_ssa_def *Asrc = nir_channel(b, src, 3); + nir_ssa_def *Adst = nir_channel(b, dst, 3); + nir_ssa_def *one = nir_imm_float(b, 1.0); + nir_ssa_def *Adsti = nir_fsub(b, one, Adst); + + return (chan < 3) ? nir_fmin(b, Asrc, Adsti) : one; +} + +/* Returns a scalar single factor, unmultiplied */ + +static nir_ssa_def * +nir_blend_factor_value( + nir_builder *b, + nir_ssa_def *src, nir_ssa_def *dst, nir_ssa_def *bconst, + unsigned chan, + enum blend_factor factor) +{ + switch (factor) { + case BLEND_FACTOR_ZERO: + return nir_imm_float(b, 0.0); + case BLEND_FACTOR_SRC_COLOR: + return nir_channel(b, src, chan); + case BLEND_FACTOR_DST_COLOR: + return nir_channel(b, dst, chan); + case BLEND_FACTOR_SRC_ALPHA: + return nir_channel(b, src, 3); + case BLEND_FACTOR_DST_ALPHA: + return nir_channel(b, dst, 3); + case BLEND_FACTOR_CONSTANT_COLOR: + return nir_channel(b, bconst, chan); + case BLEND_FACTOR_CONSTANT_ALPHA: + return nir_channel(b, bconst, 3); + case BLEND_FACTOR_SRC_ALPHA_SATURATE: + return nir_alpha_saturate(b, src, dst, chan); + } + + unreachable("Invalid blend factor"); +} + +static nir_ssa_def * +nir_blend_factor( + nir_builder *b, + nir_ssa_def *raw_scalar, + nir_ssa_def *src, nir_ssa_def *dst, nir_ssa_def *bconst, + unsigned chan, + enum blend_factor factor, + bool inverted) +{ + nir_ssa_def *f = + nir_blend_factor_value(b, src, dst, bconst, chan, factor); + + if (inverted) + f = nir_fsub(b, nir_imm_float(b, 1.0), f); + + return nir_fmul(b, raw_scalar, f); +} + +/* Given a colormask, "blend" with the destination */ + +static nir_ssa_def * +nir_color_mask( + nir_builder *b, + unsigned mask, + nir_ssa_def *src, + nir_ssa_def *dst) +{ + nir_ssa_def *masked[4]; + + for (unsigned c = 0; c < 4; ++c) { + bool enab = (mask & (1 << c)); + masked[c] = enab ? nir_channel(b, src, c) : nir_channel(b, dst, c); + } + + return nir_vec(b, masked, 4); +} + +/* Given a blend state, the source color, and the destination color, + * return the blended color + */ + +static nir_ssa_def * +nir_blend( + nir_builder *b, + nir_lower_blend_options options, + nir_ssa_def *src, nir_ssa_def *dst) +{ + /* Grab the blend constant ahead of time */ + nir_ssa_def *bconst = nir_load_blend_const_color_rgba(b); + + /* We blend per channel and recombine later */ + nir_ssa_def *channels[4]; + + for (unsigned c = 0; c < 4; ++c) { + /* Decide properties based on channel */ + nir_lower_blend_channel chan = + (c < 3) ? options.rt[0].rgb : options.rt[0].alpha; + + nir_ssa_def *psrc = nir_channel(b, src, c); + nir_ssa_def *pdst = nir_channel(b, dst, c); + + if (nir_blend_factored(chan.func)) { + psrc = nir_blend_factor( + b, psrc, + src, dst, bconst, c, + chan.src_factor, chan.invert_src_factor); + + pdst = nir_blend_factor( + b, pdst, + src, dst, bconst, c, + chan.dst_factor, chan.invert_dst_factor); + } + + channels[c] = nir_blend_func(b, chan.func, psrc, pdst); + } + + /* Then just recombine with an applied colormask */ + nir_ssa_def *blended = nir_vec(b, channels, 4); + return nir_color_mask(b, options.rt[0].colormask, blended, dst); +} + +void +nir_lower_blend(nir_shader *shader, nir_lower_blend_options options) +{ + /* Blend shaders are represented as special fragment shaders */ + assert(shader->info.stage == MESA_SHADER_FRAGMENT); + + nir_foreach_function(func, shader) { + nir_foreach_block(block, func->impl) { + 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_deref) + continue; + + /* TODO: Extending to MRT */ + nir_variable *var = nir_intrinsic_get_var(intr, 0); + if (var->data.location != FRAG_RESULT_COLOR) + continue; + + nir_builder b; + nir_builder_init(&b, func->impl); + b.cursor = nir_before_instr(instr); + + /* Grab the input color */ + nir_ssa_def *src = nir_ssa_for_src(&b, intr->src[1], 4); + + /* Grab the tilebuffer color - io lowered to load_output */ + nir_ssa_def *dst = nir_load_var(&b, var); + + /* Blend the two colors per the passed options */ + nir_ssa_def *blended = nir_blend(&b, options, src, dst); + + /* Write out the final color instead of the input */ + nir_instr_rewrite_src(instr, &intr->src[1], + nir_src_for_ssa(blended)); + + } + } + + nir_metadata_preserve(func->impl, nir_metadata_block_index | + nir_metadata_dominance); + } +} diff --git a/src/gallium/drivers/panfrost/midgard/nir_lower_blend.h b/src/gallium/drivers/panfrost/midgard/nir_lower_blend.h new file mode 100644 index 00000000000..f8075768e7a --- /dev/null +++ b/src/gallium/drivers/panfrost/midgard/nir_lower_blend.h @@ -0,0 +1,56 @@ +/* + * Copyright � 2019 Alyssa Rosenzweig + * + * 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, sublicense, + * 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 NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS 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. + * + */ + +#ifndef NIR_BLEND_H +#define NIR_BLEND_H + +#include "compiler/nir/nir.h" + +/* These structs encapsulates the blend state such that it can be lowered + * cleanly + */ + +typedef struct { + enum blend_func func; + + enum blend_factor src_factor; + bool invert_src_factor; + + enum blend_factor dst_factor; + bool invert_dst_factor; +} nir_lower_blend_channel; + +typedef struct { + struct { + nir_lower_blend_channel rgb; + nir_lower_blend_channel alpha; + + /* 4-bit colormask. 0x0 for none, 0xF for RGBA, 0x1 for R */ + unsigned colormask; + } rt[8]; +} nir_lower_blend_options; + +void nir_lower_blend(nir_shader *shader, nir_lower_blend_options options); + +#endif diff --git a/src/gallium/drivers/panfrost/pan_blend_shaders.c b/src/gallium/drivers/panfrost/pan_blend_shaders.c index f716e85e3f5..655a50e4d26 100644 --- a/src/gallium/drivers/panfrost/pan_blend_shaders.c +++ b/src/gallium/drivers/panfrost/pan_blend_shaders.c @@ -27,7 +27,7 @@ #include "pan_util.h" #include "midgard/midgard_compile.h" #include "compiler/nir/nir_builder.h" -//#include "gallium/auxiliary/nir/nir_lower_blend.h" +#include "midgard/nir_lower_blend.h" /* * Implements the command stream portion of programmatic blend shaders. |