From 12c18ce4763d3982a52318365f45c4535aac0567 Mon Sep 17 00:00:00 2001 From: Rob Clark Date: Mon, 21 Dec 2015 21:27:25 -0500 Subject: [PATCH] nir: add lowering pass for glDrawPixels Signed-off-by: Rob Clark Reviewed-by: Connor Abbott Reviewed-by: Eric Anholt --- src/compiler/Makefile.sources | 1 + src/compiler/nir/nir.h | 13 ++ src/compiler/nir/nir_lower_drawpixels.c | 254 ++++++++++++++++++++++++ 3 files changed, 268 insertions(+) create mode 100644 src/compiler/nir/nir_lower_drawpixels.c diff --git a/src/compiler/Makefile.sources b/src/compiler/Makefile.sources index b542a1a152f..9512207b327 100644 --- a/src/compiler/Makefile.sources +++ b/src/compiler/Makefile.sources @@ -190,6 +190,7 @@ NIR_FILES = \ nir/nir_lower_clip.c \ nir/nir_lower_double_ops.c \ nir/nir_lower_double_packing.c \ + nir/nir_lower_drawpixels.c \ nir/nir_lower_global_vars_to_local.c \ nir/nir_lower_gs_intrinsics.c \ nir/nir_lower_load_const_to_scalar.c \ diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h index 474ba6341ec..364972d046b 100644 --- a/src/compiler/nir/nir.h +++ b/src/compiler/nir/nir.h @@ -2385,6 +2385,19 @@ typedef struct nir_lower_wpos_ytransform_options { bool nir_lower_wpos_ytransform(nir_shader *shader, const nir_lower_wpos_ytransform_options *options); +typedef struct nir_lower_drawpixels_options { + int texcoord_state_tokens[5]; + int scale_state_tokens[5]; + int bias_state_tokens[5]; + unsigned drawpix_sampler; + unsigned pixelmap_sampler; + bool pixel_maps :1; + bool scale_and_bias :1; +} nir_lower_drawpixels_options; + +void nir_lower_drawpixels(nir_shader *shader, + const nir_lower_drawpixels_options *options); + void nir_lower_atomics(nir_shader *shader, const struct gl_shader_program *shader_program); void nir_lower_to_source_mods(nir_shader *shader); diff --git a/src/compiler/nir/nir_lower_drawpixels.c b/src/compiler/nir/nir_lower_drawpixels.c new file mode 100644 index 00000000000..7ffaa525b5a --- /dev/null +++ b/src/compiler/nir/nir_lower_drawpixels.c @@ -0,0 +1,254 @@ +/* + * Copyright © 2015 Red Hat + * + * 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. + */ + +#include "nir.h" +#include "nir_builder.h" + +/* Lower glDrawPixels(). + * + * This is based on the logic in st_get_drawpix_shader() in TGSI compiler. + * + * Run before nir_lower_io. + */ + +typedef struct { + const nir_lower_drawpixels_options *options; + nir_shader *shader; + nir_builder b; + nir_variable *texcoord, *scale, *bias; +} lower_drawpixels_state; + +static nir_ssa_def * +get_texcoord(lower_drawpixels_state *state) +{ + if (state->texcoord == NULL) { + nir_variable *texcoord = NULL; + + /* find gl_TexCoord, if it exists: */ + nir_foreach_variable(var, &state->shader->inputs) { + if (var->data.location == VARYING_SLOT_TEX0) { + texcoord = var; + break; + } + } + + /* otherwise create it: */ + if (texcoord == NULL) { + texcoord = nir_variable_create(state->shader, + nir_var_shader_in, + glsl_vec4_type(), + "gl_TexCoord"); + texcoord->data.location = VARYING_SLOT_TEX0; + } + + state->texcoord = texcoord; + } + return nir_load_var(&state->b, state->texcoord); +} + +static nir_variable * +create_uniform(nir_shader *shader, const char *name, const int state_tokens[5]) +{ + nir_variable *var = nir_variable_create(shader, + nir_var_uniform, + glsl_vec4_type(), + name); + var->num_state_slots = 1; + var->state_slots = ralloc_array(var, nir_state_slot, 1); + memcpy(var->state_slots[0].tokens, state_tokens, + sizeof(var->state_slots[0].tokens)); + return var; +} + +static nir_ssa_def * +get_scale(lower_drawpixels_state *state) +{ + if (state->scale == NULL) { + state->scale = create_uniform(state->shader, "gl_PTscale", + state->options->scale_state_tokens); + } + return nir_load_var(&state->b, state->scale); +} + +static nir_ssa_def * +get_bias(lower_drawpixels_state *state) +{ + if (state->bias == NULL) { + state->bias = create_uniform(state->shader, "gl_PTbias", + state->options->bias_state_tokens); + } + return nir_load_var(&state->b, state->bias); +} + +static nir_ssa_def * +get_texcoord_const(lower_drawpixels_state *state) +{ + if (state->bias == NULL) { + state->bias = create_uniform(state->shader, "gl_MultiTexCoord0", + state->options->texcoord_state_tokens); + } + return nir_load_var(&state->b, state->bias); +} + +static void +lower_color(lower_drawpixels_state *state, nir_intrinsic_instr *intr) +{ + nir_builder *b = &state->b; + nir_ssa_def *texcoord; + nir_tex_instr *tex; + nir_ssa_def *def; + + assert(intr->dest.is_ssa); + + b->cursor = nir_before_instr(&intr->instr); + + texcoord = get_texcoord(state); + + /* replace load_var(gl_Color) w/ texture sample: + * TEX def, texcoord, drawpix_sampler, 2D + */ + tex = nir_tex_instr_create(state->shader, 1); + tex->op = nir_texop_tex; + tex->sampler_dim = GLSL_SAMPLER_DIM_2D; + tex->coord_components = 2; + tex->sampler_index = state->options->drawpix_sampler; + tex->texture_index = state->options->drawpix_sampler; + tex->dest_type = nir_type_float; + tex->src[0].src = nir_src_for_ssa(texcoord); + + nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32, NULL); + nir_builder_instr_insert(b, &tex->instr); + def = &tex->dest.ssa; + + /* Apply the scale and bias. */ + if (state->options->scale_and_bias) { + /* MAD def, def, scale, bias; */ + def = nir_ffma(b, def, get_scale(state), get_bias(state)); + } + + if (state->options->pixel_maps) { + static const unsigned swiz_xy[4] = {0,1}; + static const unsigned swiz_zw[4] = {2,3}; + + /* do four pixel map look-ups with two TEX instructions: */ + nir_ssa_def *def_xy, *def_zw; + + /* TEX def.xy, def.xyyy, pixelmap_sampler, 2D; */ + tex = nir_tex_instr_create(state->shader, 1); + tex->op = nir_texop_tex; + tex->sampler_dim = GLSL_SAMPLER_DIM_2D; + tex->coord_components = 2; + tex->sampler_index = state->options->pixelmap_sampler; + tex->texture_index = state->options->pixelmap_sampler; + tex->dest_type = nir_type_float; + tex->src[0].src = nir_src_for_ssa(nir_swizzle(b, def, swiz_xy, 2, true)); + + nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32, NULL); + nir_builder_instr_insert(b, &tex->instr); + def_xy = &tex->dest.ssa; + + /* TEX def.zw, def.zwww, pixelmap_sampler, 2D; */ + tex = nir_tex_instr_create(state->shader, 1); + tex->op = nir_texop_tex; + tex->sampler_dim = GLSL_SAMPLER_DIM_2D; + tex->coord_components = 2; + tex->sampler_index = state->options->pixelmap_sampler; + tex->dest_type = nir_type_float; + tex->src[0].src = nir_src_for_ssa(nir_swizzle(b, def, swiz_zw, 2, true)); + + nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32, NULL); + nir_builder_instr_insert(b, &tex->instr); + def_zw = &tex->dest.ssa; + + /* def = vec4(def.xy, def.zw); */ + def = nir_vec4(b, + nir_channel(b, def_xy, 0), + nir_channel(b, def_xy, 1), + nir_channel(b, def_zw, 0), + nir_channel(b, def_zw, 1)); + } + + nir_ssa_def_rewrite_uses(&intr->dest.ssa, nir_src_for_ssa(def)); +} + +static void +lower_texcoord(lower_drawpixels_state *state, nir_intrinsic_instr *intr) +{ + nir_ssa_def *texcoord_const = get_texcoord_const(state); + nir_ssa_def_rewrite_uses(&intr->dest.ssa, nir_src_for_ssa(texcoord_const)); +} + +static bool +lower_drawpixels_block(lower_drawpixels_state *state, nir_block *block) +{ + nir_foreach_instr_safe(instr, block) { + if (instr->type == nir_instr_type_intrinsic) { + nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr); + if (intr->intrinsic == nir_intrinsic_load_var) { + nir_deref_var *dvar = intr->variables[0]; + nir_variable *var = dvar->var; + + if (var->data.location == VARYING_SLOT_COL0) { + /* gl_FragCoord should not have array/struct deref's: */ + assert(dvar->deref.child == NULL); + lower_color(state, intr); + } else if (var->data.location == VARYING_SLOT_TEX0) { + /* gl_TexCoord should not have array/struct deref's: */ + assert(dvar->deref.child == NULL); + lower_texcoord(state, intr); + } + } + } + } + + return true; +} + +static void +lower_drawpixels_impl(lower_drawpixels_state *state, nir_function_impl *impl) +{ + nir_builder_init(&state->b, impl); + + nir_foreach_block(block, impl) { + lower_drawpixels_block(state, block); + } + nir_metadata_preserve(impl, nir_metadata_block_index | + nir_metadata_dominance); +} + +void +nir_lower_drawpixels(nir_shader *shader, + const nir_lower_drawpixels_options *options) +{ + lower_drawpixels_state state = { + .options = options, + .shader = shader, + }; + + assert(shader->stage == MESA_SHADER_FRAGMENT); + + nir_foreach_function(function, shader) { + if (function->impl) + lower_drawpixels_impl(&state, function->impl); + } +} -- 2.30.2