From: Kenneth Graunke Date: Sun, 13 Jan 2019 18:39:41 +0000 (-0800) Subject: nir: Gather texture bitmasks in gl_nir_lower_samplers_as_deref. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f5c7df4dc95ca115b1a1c916b0b133692a7ea6d9;p=mesa.git nir: Gather texture bitmasks in gl_nir_lower_samplers_as_deref. Eric and I would like a bitmask of which samplers are used, similar to prog->SamplersUsed, but available in NIR. The linker uses SamplersUsed for resource limit checking, but later optimizations may eliminate more samplers. So instead of propagating it through, we gather a new one. While there, we also gather the existing textures_used_by_txf bitmask. Gathering these bitfields in nir_shader_gather_info is awkward at best. The main reason is that it introduces an ordering dependency between the two passes. If gathering runs before lower_samplers_as_deref, it can't look at var->data.binding. If the driver doesn't use the full lowering to texture_index/texture_array_size (like radeonsi), then the gathering can't use those fields. Gathering might be run early /and/ late, first to get varying info, and later to update it after variant lowering. At this point, should gathering work on pre-lowered or post-lowered code? Pre-lowered is also harder due to the presence of structure types. Just doing the gathering when we do the lowering alleviates these ordering problems. This fixes ordering issues in i965 and makes the txf info gathering work for radeonsi (though they don't use it). Reviewed-by: Eric Anholt --- diff --git a/src/compiler/glsl/gl_nir_lower_samplers_as_deref.c b/src/compiler/glsl/gl_nir_lower_samplers_as_deref.c index c8f17ef9aaa..ea32195d42f 100644 --- a/src/compiler/glsl/gl_nir_lower_samplers_as_deref.c +++ b/src/compiler/glsl/gl_nir_lower_samplers_as_deref.c @@ -197,6 +197,26 @@ lower_deref(nir_builder *b, struct lower_samplers_as_deref_state *state, return new_deref; } +static void +record_textures_used(struct shader_info *info, + nir_deref_instr *deref, + nir_texop op) +{ + nir_variable *var = nir_deref_instr_get_variable(deref); + + /* Structs have been lowered already, so get_aoa_size is sufficient. */ + const unsigned size = + glsl_type_is_array(var->type) ? glsl_get_aoa_size(var->type) : 1; + unsigned mask = ((1ull << MAX2(size, 1)) - 1) << var->data.binding; + + info->textures_used |= mask; + + if (op == nir_texop_txf || + op == nir_texop_txf_ms || + op == nir_texop_txf_ms_mcs) + info->textures_used_by_txf |= mask; +} + static bool lower_sampler(nir_tex_instr *instr, struct lower_samplers_as_deref_state *state, nir_builder *b) @@ -217,6 +237,7 @@ lower_sampler(nir_tex_instr *instr, struct lower_samplers_as_deref_state *state, if (texture_deref) { nir_instr_rewrite_src(&instr->instr, &instr->src[texture_idx].src, nir_src_for_ssa(&texture_deref->dest.ssa)); + record_textures_used(&b->shader->info, texture_deref, instr->op); } } @@ -297,6 +318,9 @@ gl_nir_lower_samplers_as_deref(nir_shader *shader, state.remap_table = _mesa_hash_table_create(NULL, _mesa_key_hash_string, _mesa_key_string_equal); + shader->info.textures_used = 0; + shader->info.textures_used_by_txf = 0; + nir_foreach_function(function, shader) { if (function->impl) progress |= lower_impl(function->impl, &state); diff --git a/src/compiler/nir/nir_gather_info.c b/src/compiler/nir/nir_gather_info.c index 18a74a135d9..19438912ff0 100644 --- a/src/compiler/nir/nir_gather_info.c +++ b/src/compiler/nir/nir_gather_info.c @@ -286,13 +286,6 @@ gather_tex_info(nir_tex_instr *instr, nir_shader *shader) case nir_texop_tg4: shader->info.uses_texture_gather = true; break; - case nir_texop_txf: - case nir_texop_txf_ms: - case nir_texop_txf_ms_mcs: - shader->info.textures_used_by_txf |= - ((1 << MAX2(instr->texture_array_size, 1)) - 1) << - instr->texture_index; - break; default: break; } diff --git a/src/compiler/shader_info.h b/src/compiler/shader_info.h index 3d871938751..ea6f9a16375 100644 --- a/src/compiler/shader_info.h +++ b/src/compiler/shader_info.h @@ -115,6 +115,9 @@ typedef struct shader_info { /* Whether or not this shader ever uses textureGather() */ bool uses_texture_gather; + /** Bitfield of which textures are used */ + uint32_t textures_used; + /** Bitfield of which textures are used by texelFetch() */ uint32_t textures_used_by_txf; diff --git a/src/mesa/drivers/dri/i965/brw_link.cpp b/src/mesa/drivers/dri/i965/brw_link.cpp index 2cbb1e0b879..66581b21f61 100644 --- a/src/mesa/drivers/dri/i965/brw_link.cpp +++ b/src/mesa/drivers/dri/i965/brw_link.cpp @@ -324,6 +324,8 @@ brw_link_shader(struct gl_context *ctx, struct gl_shader_program *shProg) brw_shader_gather_info(prog->nir, prog); NIR_PASS_V(prog->nir, gl_nir_lower_samplers, shProg); + prog->info.textures_used = prog->nir->info.textures_used; + prog->info.textures_used_by_txf = prog->nir->info.textures_used_by_txf; NIR_PASS_V(prog->nir, gl_nir_lower_atomics, shProg, false); NIR_PASS_V(prog->nir, nir_lower_atomics_to_ssbo, prog->nir->info.num_abos); diff --git a/src/mesa/state_tracker/st_glsl_to_nir.cpp b/src/mesa/state_tracker/st_glsl_to_nir.cpp index b904060528b..89f7424e4db 100644 --- a/src/mesa/state_tracker/st_glsl_to_nir.cpp +++ b/src/mesa/state_tracker/st_glsl_to_nir.cpp @@ -848,12 +848,18 @@ st_nir_assign_varying_locations(struct st_context *st, nir_shader *nir) void st_nir_lower_samplers(struct pipe_screen *screen, nir_shader *nir, - struct gl_shader_program *shader_program) + struct gl_shader_program *shader_program, + struct gl_program *prog) { if (screen->get_param(screen, PIPE_CAP_NIR_SAMPLERS_AS_DEREF)) NIR_PASS_V(nir, gl_nir_lower_samplers_as_deref, shader_program); else NIR_PASS_V(nir, gl_nir_lower_samplers, shader_program); + + if (prog) { + prog->info.textures_used = nir->info.textures_used; + prog->info.textures_used_by_txf = nir->info.textures_used_by_txf; + } } /* Last third of preparing nir from glsl, which happens after shader @@ -891,7 +897,7 @@ st_finalize_nir(struct st_context *st, struct gl_program *prog, NIR_PASS_V(nir, st_nir_lower_uniforms_to_ubo); } - st_nir_lower_samplers(screen, nir, shader_program); + st_nir_lower_samplers(screen, nir, shader_program, prog); } } /* extern "C" */ diff --git a/src/mesa/state_tracker/st_nir.h b/src/mesa/state_tracker/st_nir.h index 42a04a4676b..d45ab3c4474 100644 --- a/src/mesa/state_tracker/st_nir.h +++ b/src/mesa/state_tracker/st_nir.h @@ -56,7 +56,8 @@ void st_nir_assign_varying_locations(struct st_context *st, struct nir_shader *nir); void st_nir_lower_samplers(struct pipe_screen *screen, struct nir_shader *nir, - struct gl_shader_program *shader_program); + struct gl_shader_program *shader_program, + struct gl_program *prog); struct pipe_shader_state * st_nir_finish_builtin_shader(struct st_context *st, diff --git a/src/mesa/state_tracker/st_nir_builtins.c b/src/mesa/state_tracker/st_nir_builtins.c index 18dc2095d6f..3826d96a888 100644 --- a/src/mesa/state_tracker/st_nir_builtins.c +++ b/src/mesa/state_tracker/st_nir_builtins.c @@ -61,7 +61,7 @@ st_nir_finish_builtin_shader(struct st_context *st, st_nir_assign_varying_locations(st, nir); - st_nir_lower_samplers(screen, nir, NULL); + st_nir_lower_samplers(screen, nir, NULL, NULL); if (st->ctx->Const.PackedDriverUniformStorage) { NIR_PASS_V(nir, nir_lower_io, nir_var_uniform, st_glsl_type_dword_size,