src/tint/lang/glsl/writer/raise/raise.cc

// Copyright 2023 The Dawn & Tint Authors
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#include "src/tint/lang/glsl/writer/raise/raise.h"

#include "src/tint/lang/core/ir/module.h"
#include "src/tint/lang/core/ir/transform/add_empty_entry_point.h"
#include "src/tint/lang/core/ir/transform/array_length_from_uniform.h"
#include "src/tint/lang/core/ir/transform/bgra8unorm_polyfill.h"
#include "src/tint/lang/core/ir/transform/binary_polyfill.h"
#include "src/tint/lang/core/ir/transform/binding_remapper.h"
#include "src/tint/lang/core/ir/transform/block_decorated_structs.h"
#include "src/tint/lang/core/ir/transform/builtin_polyfill.h"
#include "src/tint/lang/core/ir/transform/conversion_polyfill.h"
#include "src/tint/lang/core/ir/transform/demote_to_helper.h"
#include "src/tint/lang/core/ir/transform/direct_variable_access.h"
#include "src/tint/lang/core/ir/transform/multiplanar_external_texture.h"
#include "src/tint/lang/core/ir/transform/prepare_push_constants.h"
#include "src/tint/lang/core/ir/transform/preserve_padding.h"
#include "src/tint/lang/core/ir/transform/remove_continue_in_switch.h"
#include "src/tint/lang/core/ir/transform/remove_terminator_args.h"
#include "src/tint/lang/core/ir/transform/rename_conflicts.h"
#include "src/tint/lang/core/ir/transform/robustness.h"
#include "src/tint/lang/core/ir/transform/std140.h"
#include "src/tint/lang/core/ir/transform/value_to_let.h"
#include "src/tint/lang/core/ir/transform/vectorize_scalar_matrix_constructors.h"
#include "src/tint/lang/core/ir/transform/zero_init_workgroup_memory.h"
#include "src/tint/lang/core/type/f32.h"
#include "src/tint/lang/core/type/u32.h"
#include "src/tint/lang/glsl/writer/common/option_helpers.h"
#include "src/tint/lang/glsl/writer/raise/binary_polyfill.h"
#include "src/tint/lang/glsl/writer/raise/bitcast_polyfill.h"
#include "src/tint/lang/glsl/writer/raise/builtin_polyfill.h"
#include "src/tint/lang/glsl/writer/raise/offset_first_index.h"
#include "src/tint/lang/glsl/writer/raise/shader_io.h"
#include "src/tint/lang/glsl/writer/raise/texture_builtins_from_uniform.h"
#include "src/tint/lang/glsl/writer/raise/texture_polyfill.h"

namespace tint::glsl::writer {

Result<SuccessType> Raise(core::ir::Module& module, const Options& options) {
#define RUN_TRANSFORM(name, ...)         \
    do {                                 \
        auto result = name(__VA_ARGS__); \
        if (result != Success) {         \
            return result.Failure();     \
        }                                \
    } while (false)

    // Must come before TextureBuiltinsFromUniform as it may add `textureNumLevels` calls.
    if (!options.disable_robustness) {
        core::ir::transform::RobustnessConfig config{};
        RUN_TRANSFORM(core::ir::transform::Robustness, module, config);
    }

    // PreparePushConstants must come before any transform that needs internal push constants.
    core::ir::transform::PreparePushConstantsConfig push_constant_config;
    if (options.first_instance_offset) {
        push_constant_config.AddInternalConstant(options.first_instance_offset.value(),
                                                 module.symbols.New("tint_first_instance"),
                                                 module.Types().u32());
    }
    if (options.first_vertex_offset) {
        push_constant_config.AddInternalConstant(options.first_vertex_offset.value(),
                                                 module.symbols.New("tint_first_vertex"),
                                                 module.Types().u32());
    }
    if (options.depth_range_offsets) {
        push_constant_config.AddInternalConstant(options.depth_range_offsets.value().min,
                                                 module.symbols.New("tint_frag_depth_min"),
                                                 module.Types().f32());
        push_constant_config.AddInternalConstant(options.depth_range_offsets.value().max,
                                                 module.symbols.New("tint_frag_depth_max"),
                                                 module.Types().f32());
    }
    auto push_constant_layout =
        core::ir::transform::PreparePushConstants(module, push_constant_config);
    if (push_constant_layout != Success) {
        return push_constant_layout.Failure();
    }

    // Note, this comes before binding remapper as Dawn inserts _pre-remapping_ binding information.
    // So, in order to move this later we'd need to update Dawn to send the _post-remapping_ data.
    RUN_TRANSFORM(raise::TextureBuiltinsFromUniform, module,
                  options.bindings.texture_builtins_from_uniform);

    tint::transform::multiplanar::BindingsMap multiplanar_map{};
    RemapperData remapper_data{};
    PopulateBindingInfo(options, remapper_data, multiplanar_map);
    RUN_TRANSFORM(core::ir::transform::BindingRemapper, module, remapper_data);

    {
        core::ir::transform::BinaryPolyfillConfig binary_polyfills{};
        binary_polyfills.int_div_mod = !options.disable_polyfill_integer_div_mod;
        binary_polyfills.bitshift_modulo = true;  // crbug.com/tint/1543
        RUN_TRANSFORM(core::ir::transform::BinaryPolyfill, module, binary_polyfills);
    }

    {
        core::ir::transform::BuiltinPolyfillConfig core_polyfills{};
        core_polyfills.clamp_int = true;
        core_polyfills.count_leading_zeros = true;
        core_polyfills.count_trailing_zeros = true;
        core_polyfills.extract_bits = core::ir::transform::BuiltinPolyfillLevel::kClampOrRangeCheck;
        core_polyfills.first_leading_bit = true;
        core_polyfills.first_trailing_bit = true;
        core_polyfills.insert_bits = core::ir::transform::BuiltinPolyfillLevel::kClampOrRangeCheck;
        core_polyfills.saturate = true;
        core_polyfills.texture_sample_base_clamp_to_edge_2d_f32 = true;
        core_polyfills.dot_4x8_packed = true;
        core_polyfills.pack_unpack_4x8 = true;
        core_polyfills.pack_4xu8_clamp = true;

        RUN_TRANSFORM(core::ir::transform::BuiltinPolyfill, module, core_polyfills);
    }

    RUN_TRANSFORM(core::ir::transform::Bgra8UnormPolyfill, module);

    {
        core::ir::transform::ConversionPolyfillConfig conversion_polyfills;
        conversion_polyfills.ftoi = true;
        RUN_TRANSFORM(core::ir::transform::ConversionPolyfill, module, conversion_polyfills);
    }

    RUN_TRANSFORM(core::ir::transform::MultiplanarExternalTexture, module, multiplanar_map);

    RUN_TRANSFORM(core::ir::transform::BlockDecoratedStructs, module);

    // TODO(dsinclair): CombineSamplers

    {
        // This must come after `MultiplanarExternalTexture` as it will insert functions with
        // texture parameters
        core::ir::transform::DirectVariableAccessOptions dva_config{};
        dva_config.transform_handle = true;
        RUN_TRANSFORM(core::ir::transform::DirectVariableAccess, module, dva_config);
    }

    if (!options.disable_workgroup_init) {
        RUN_TRANSFORM(core::ir::transform::ZeroInitWorkgroupMemory, module);
    }

    // DemoteToHelper must come before any transform that introduces non-core instructions.
    RUN_TRANSFORM(core::ir::transform::DemoteToHelper, module);

    RUN_TRANSFORM(raise::BinaryPolyfill, module);
    // Must come after zero-init as it will add builtins
    RUN_TRANSFORM(raise::BuiltinPolyfill, module);

    {
        // Must come after DirectVariableAccess
        raise::TexturePolyfillConfig tex_config;
        tex_config.sampler_texture_to_name = options.bindings.sampler_texture_to_name;
        tex_config.placeholder_sampler_bind_point = options.bindings.placeholder_sampler_bind_point;
        tex_config.texture_builtins_from_uniform = options.bindings.texture_builtins_from_uniform;
        RUN_TRANSFORM(raise::TexturePolyfill, module, tex_config);
    }

    // Must come after BuiltinPolyfill as builtins can add bitcasts
    RUN_TRANSFORM(raise::BitcastPolyfill, module);

    RUN_TRANSFORM(core::ir::transform::PreservePadding, module);
    RUN_TRANSFORM(core::ir::transform::VectorizeScalarMatrixConstructors, module);
    RUN_TRANSFORM(core::ir::transform::RemoveContinueInSwitch, module);

    RUN_TRANSFORM(core::ir::transform::AddEmptyEntryPoint, module);

    RUN_TRANSFORM(raise::ShaderIO, module,
                  raise::ShaderIOConfig{push_constant_layout.Get(), options.depth_range_offsets});

    // Must come after ShaderIO as it operates on module-scope `in` variables.
    RUN_TRANSFORM(
        raise::OffsetFirstIndex, module,
        raise::OffsetFirstIndexConfig{push_constant_layout.Get(), options.first_vertex_offset,
                                      options.first_instance_offset});

    RUN_TRANSFORM(core::ir::transform::Std140, module);

    // These transforms need to be run last as various transforms introduce terminator arguments,
    // naming conflicts, and expressions that need to be explicitly not inlined.
    RUN_TRANSFORM(core::ir::transform::RemoveTerminatorArgs, module);
    RUN_TRANSFORM(core::ir::transform::RenameConflicts, module);

    {
        core::ir::transform::ValueToLetConfig cfg;
        cfg.replace_pointer_lets = true;
        RUN_TRANSFORM(core::ir::transform::ValueToLet, module, cfg);
    }

    return Success;
}

}  // namespace tint::glsl::writer