From 258106038e921de6863d3e871a82fb7a0c77f10d Mon Sep 17 00:00:00 2001 From: ameerj <52414509+ameerj@users.noreply.github.com> Date: Mon, 7 Jun 2021 18:04:01 -0400 Subject: [PATCH] glsl: Allow dynamic tracking of variable allocation --- .../backend/glsl/emit_glsl.cpp | 17 +++++++--- .../backend/glsl/var_alloc.cpp | 34 +++++++++++-------- .../backend/glsl/var_alloc.h | 5 ++- 3 files changed, 35 insertions(+), 21 deletions(-) diff --git a/src/shader_recompiler/backend/glsl/emit_glsl.cpp b/src/shader_recompiler/backend/glsl/emit_glsl.cpp index 7b57c1e91..b189f6c11 100644 --- a/src/shader_recompiler/backend/glsl/emit_glsl.cpp +++ b/src/shader_recompiler/backend/glsl/emit_glsl.cpp @@ -172,19 +172,28 @@ std::string GlslVersionSpecifier(const EmitContext& ctx) { return ""; } +bool IsPreciseType(GlslVarType type) { + switch (type) { + case GlslVarType::PrecF32: + case GlslVarType::PrecF64: + return true; + default: + return false; + } +} + void DefineVariables(const EmitContext& ctx, std::string& header) { for (u32 i = 0; i < static_cast(GlslVarType::Void); ++i) { const auto type{static_cast(i)}; const auto& tracker{ctx.var_alloc.GetUseTracker(type)}; const auto type_name{ctx.var_alloc.GetGlslType(type)}; - const auto precise{ - (type == GlslVarType::PrecF32 || type == GlslVarType::PrecF64) ? "precise " : ""}; + const auto precise{IsPreciseType(type) ? "precise " : ""}; // Temps/return types that are never used are stored at index 0 if (tracker.uses_temp) { - header += fmt::format("{}{} {}={}(0);", precise, type_name, + header += fmt::format("{}{} t{}={}(0);", precise, type_name, ctx.var_alloc.Representation(0, type), type_name); } - for (u32 index = 1; index <= tracker.num_used; ++index) { + for (u32 index = 0; index < tracker.num_used; ++index) { header += fmt::format("{}{} {}={}(0);", precise, type_name, ctx.var_alloc.Representation(index, type), type_name); } diff --git a/src/shader_recompiler/backend/glsl/var_alloc.cpp b/src/shader_recompiler/backend/glsl/var_alloc.cpp index 0ae56651e..95e8233e2 100644 --- a/src/shader_recompiler/backend/glsl/var_alloc.cpp +++ b/src/shader_recompiler/backend/glsl/var_alloc.cpp @@ -116,8 +116,8 @@ std::string VarAlloc::Define(IR::Inst& inst, GlslVarType type) { id.type.Assign(type); GetUseTracker(type).uses_temp = true; inst.SetDefinition(id); + return "t" + Representation(inst.Definition()); } - return Representation(inst.Definition()); } std::string VarAlloc::Define(IR::Inst& inst, IR::Type type) { @@ -156,21 +156,27 @@ std::string VarAlloc::GetGlslType(IR::Type type) const { Id VarAlloc::Alloc(GlslVarType type) { auto& use_tracker{GetUseTracker(type)}; - if (use_tracker.num_used < NUM_VARS) { - for (size_t var = 1; var < NUM_VARS; ++var) { - if (use_tracker.var_use[var]) { - continue; - } - use_tracker.num_used = std::max(use_tracker.num_used, var + 1); - use_tracker.var_use[var] = true; - Id ret{}; - ret.is_valid.Assign(1); - ret.type.Assign(type); - ret.index.Assign(static_cast(var)); - return ret; + const auto num_vars{use_tracker.var_use.size()}; + for (size_t var = 0; var < num_vars; ++var) { + if (use_tracker.var_use[var]) { + continue; } + use_tracker.num_used = std::max(use_tracker.num_used, var + 1); + use_tracker.var_use[var] = true; + Id ret{}; + ret.is_valid.Assign(1); + ret.type.Assign(type); + ret.index.Assign(static_cast(var)); + return ret; } - throw NotImplementedException("Variable spilling"); + // Allocate a new variable + use_tracker.var_use.push_back(true); + Id ret{}; + ret.is_valid.Assign(1); + ret.type.Assign(type); + ret.index.Assign(static_cast(use_tracker.num_used)); + ++use_tracker.num_used; + return ret; } void VarAlloc::Free(Id id) { diff --git a/src/shader_recompiler/backend/glsl/var_alloc.h b/src/shader_recompiler/backend/glsl/var_alloc.h index ed936f8dc..ab1d1acbd 100644 --- a/src/shader_recompiler/backend/glsl/var_alloc.h +++ b/src/shader_recompiler/backend/glsl/var_alloc.h @@ -57,11 +57,10 @@ static_assert(sizeof(Id) == sizeof(u32)); class VarAlloc { public: - static constexpr size_t NUM_VARS = 1023; struct UseTracker { - size_t num_used{}; - std::bitset var_use{}; bool uses_temp{}; + size_t num_used{}; + std::vector var_use; }; /// Used for explicit usages of variables, may revert to temporaries