st/nir: Make new helpers for constructing built-in NIR shaders.
The state tracker generates several built-in shaders in order to perform scissored clears, upload/download PBOs, and so on. These are currently constructed using TGSI, using ureg and u_simple_shader. I want to have NIR versions of these shaders, for my Gallium driver that has a NIR backend but no TGSI support. To that end, we'll want a few helpers to help construct simple shaders. This patch adds two new helpers: - st_nir_finish_builtin_shader() takes a manually constructed NIR shader, applies lowering passes (like st_link_nir would do for GLSL), and constructs the pipe_shader_state. - st_nir_make_passthrough_shader() makes a simple passthrough shader, which copies inputs to outputs. This is similar to u_simple_shaders. v2: Set info->fs.untyped_color_outputs for vc4/v3d (thanks Eric!). Reviewed-by: Marek Olšák <marek.olsak@amd.com> Tested-by: Rob Clark <robdclark@gmail.com> Tested-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Kenneth Graunke
@@ -538,6 +538,7 @@ STATETRACKER_FILES = \
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state_tracker/st_mesa_to_tgsi.c \
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state_tracker/st_mesa_to_tgsi.h \
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state_tracker/st_nir.h \
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state_tracker/st_nir_builtins.c \
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state_tracker/st_nir_lower_builtin.c \
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state_tracker/st_nir_lower_tex_src_plane.c \
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state_tracker/st_nir_lower_uniforms_to_ubo.c \
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@@ -582,6 +582,7 @@ files_libmesa_gallium = files(
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'state_tracker/st_mesa_to_tgsi.c',
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'state_tracker/st_mesa_to_tgsi.h',
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'state_tracker/st_nir.h',
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'state_tracker/st_nir_builtins.c',
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'state_tracker/st_nir_lower_builtin.c',
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'state_tracker/st_nir_lower_tex_src_plane.c',
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'state_tracker/st_nir_lower_uniforms_to_ubo.c',
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@@ -55,6 +55,21 @@ st_link_nir(struct gl_context *ctx,
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void st_nir_assign_varying_locations(struct st_context *st,
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struct nir_shader *nir);
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struct pipe_shader_state *
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st_nir_finish_builtin_shader(struct st_context *st,
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struct nir_shader *nir,
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const char *name);
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struct pipe_shader_state *
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st_nir_make_passthrough_shader(struct st_context *st,
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const char *shader_name,
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gl_shader_stage stage,
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unsigned num_vars,
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unsigned *input_locations,
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unsigned *output_locations,
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unsigned *interpolation_modes,
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unsigned sysval_mask);
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#ifdef __cplusplus
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}
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#endif
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138
src/mesa/state_tracker/st_nir_builtins.c
Normal file
138
src/mesa/state_tracker/st_nir_builtins.c
Normal file
@@ -0,0 +1,138 @@
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/*
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* Copyright © 2018 Intel Corporation
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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 shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR 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
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "tgsi/tgsi_from_mesa.h"
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#include "st_glsl_types.h"
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#include "st_nir.h"
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#include "nir_builder.h"
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struct pipe_shader_state *
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st_nir_finish_builtin_shader(struct st_context *st,
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nir_shader *nir,
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const char *name)
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{
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struct pipe_context *pipe = st->pipe;
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struct pipe_screen *screen = pipe->screen;
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enum pipe_shader_type p_stage = pipe_shader_type_from_mesa(nir->info.stage);
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bool is_scalar =
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screen->get_shader_param(screen, p_stage, PIPE_SHADER_CAP_SCALAR_ISA);
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nir->info.name = ralloc_strdup(nir, name);
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nir->info.separate_shader = true;
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if (nir->info.stage == MESA_SHADER_FRAGMENT)
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nir->info.fs.untyped_color_outputs = true;
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NIR_PASS_V(nir, nir_lower_global_vars_to_local);
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NIR_PASS_V(nir, nir_split_var_copies);
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NIR_PASS_V(nir, nir_lower_var_copies);
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NIR_PASS_V(nir, nir_lower_system_values);
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if (is_scalar) {
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nir_variable_mode mask =
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(nir->info.stage > MESA_SHADER_VERTEX ? nir_var_shader_in : 0) |
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(nir->info.stage < MESA_SHADER_FRAGMENT ? nir_var_shader_out : 0);
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NIR_PASS_V(nir, nir_lower_io_to_scalar_early, mask);
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}
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st_nir_opts(nir, is_scalar);
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nir_shader_gather_info(nir, nir_shader_get_entrypoint(nir));
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st_nir_assign_varying_locations(st, nir);
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if (st->ctx->Const.PackedDriverUniformStorage) {
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NIR_PASS_V(nir, nir_lower_io, nir_var_uniform, st_glsl_type_dword_size,
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(nir_lower_io_options)0);
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NIR_PASS_V(nir, st_nir_lower_uniforms_to_ubo);
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}
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struct pipe_shader_state state = {
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.type = PIPE_SHADER_IR_NIR,
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.ir.nir = nir,
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};
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switch (nir->info.stage) {
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case MESA_SHADER_VERTEX:
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return pipe->create_vs_state(pipe, &state);
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case MESA_SHADER_TESS_CTRL:
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return pipe->create_tcs_state(pipe, &state);
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case MESA_SHADER_TESS_EVAL:
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return pipe->create_tes_state(pipe, &state);
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case MESA_SHADER_GEOMETRY:
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return pipe->create_gs_state(pipe, &state);
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case MESA_SHADER_FRAGMENT:
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return pipe->create_fs_state(pipe, &state);
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default:
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unreachable("unsupported shader stage");
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return NULL;
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}
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}
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/**
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* Make a simple shader that copies inputs to corresponding outputs.
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*/
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struct pipe_shader_state *
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st_nir_make_passthrough_shader(struct st_context *st,
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const char *shader_name,
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gl_shader_stage stage,
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unsigned num_vars,
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unsigned *input_locations,
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unsigned *output_locations,
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unsigned *interpolation_modes,
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unsigned sysval_mask)
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{
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struct nir_builder b;
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const struct glsl_type *vec4 = glsl_vec4_type();
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const nir_shader_compiler_options *options =
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st->ctx->Const.ShaderCompilerOptions[stage].NirOptions;
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nir_builder_init_simple_shader(&b, NULL, stage, options);
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char var_name[15];
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for (unsigned i = 0; i < num_vars; i++) {
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nir_variable *in;
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if (sysval_mask & (1 << i)) {
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snprintf(var_name, sizeof(var_name), "sys_%u", input_locations[i]);
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in = nir_variable_create(b.shader, nir_var_system_value,
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glsl_int_type(), var_name);
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in->data.interpolation = INTERP_MODE_FLAT;
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} else {
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snprintf(var_name, sizeof(var_name), "in_%u", input_locations[i]);
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in = nir_variable_create(b.shader, nir_var_shader_in, vec4, var_name);
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}
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in->data.location = input_locations[i];
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if (interpolation_modes)
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in->data.interpolation = interpolation_modes[i];
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snprintf(var_name, sizeof(var_name), "out_%u", output_locations[i]);
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nir_variable *out =
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nir_variable_create(b.shader, nir_var_shader_out, in->type, var_name);
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out->data.location = output_locations[i];
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out->data.interpolation = in->data.interpolation;
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nir_copy_var(&b, out, in);
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}
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return st_nir_finish_builtin_shader(st, b.shader, shader_name);
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}
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