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glsl: Allow dynamic tracking of variable allocation

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This commit is contained in:
ameerj 2021-06-07 18:04:01 -04:00
parent 465903468e
commit 258106038e
3 changed files with 35 additions and 21 deletions
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17
src/shader_recompiler/backend/glsl/emit_glsl.cpp
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@ -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<u32>(GlslVarType::Void); ++i) {
const auto type{static_cast<GlslVarType>(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);
}

34
src/shader_recompiler/backend/glsl/var_alloc.cpp
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@ -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>(id);
return "t" + Representation(inst.Definition<Id>());
}
return Representation(inst.Definition<Id>());
}
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<u32>(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<u32>(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<u32>(use_tracker.num_used));
++use_tracker.num_used;
return ret;
}
void VarAlloc::Free(Id id) {

5
src/shader_recompiler/backend/glsl/var_alloc.h
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@ -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<NUM_VARS> var_use{};
bool uses_temp{};
size_t num_used{};
std::vector<bool> var_use;
};
/// Used for explicit usages of variables, may revert to temporaries