src/tint/lang/glsl/writer/common/options.h

// Copyright 2023 The Dawn & Tint Authors
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#ifndef SRC_TINT_LANG_GLSL_WRITER_COMMON_OPTIONS_H_
#define SRC_TINT_LANG_GLSL_WRITER_COMMON_OPTIONS_H_

#include <optional>
#include <string>
#include <unordered_map>

#include "src/tint/api/options/binding_remapper.h"
#include "src/tint/api/options/depth_range_offsets.h"
#include "src/tint/api/options/external_texture.h"
#include "src/tint/api/options/texture_builtins_from_uniform.h"
#include "src/tint/lang/glsl/writer/common/version.h"
#include "src/tint/lang/wgsl/sem/sampler_texture_pair.h"

namespace tint::glsl::writer {

using SamplerTexturePair = sem::SamplerTexturePair;
using BindingMap = std::unordered_map<SamplerTexturePair, std::string>;

/// Configuration options used for generating GLSL.
struct Options {
    /// Constructor
    Options();

    /// Destructor
    ~Options();

    /// Copy constructor
    Options(const Options&);

    /// Set to `true` to disable software robustness that prevents out-of-bounds accesses.
    bool disable_robustness = false;

    /// Set to `true` to disable workgroup memory zero initialization
    bool disable_workgroup_init = false;

    /// Set to `true` to disable the polyfills on integer division and modulo.
    bool disable_polyfill_integer_div_mod = false;

    /// The GLSL version to emit
    Version version;

    /// A map of SamplerTexturePair to combined sampler names for the
    /// CombineSamplers transform
    BindingMap binding_map;

    /// The binding point to use for placeholder samplers.
    BindingPoint placeholder_binding_point;

    /// Options used in the bindings remapper
    BindingRemapperOptions binding_remapper_options = {};

    /// Options used in the binding mappings for external textures
    ExternalTextureOptions external_texture_options = {};

    /// Offset of the firstInstance push constant.
    std::optional<int32_t> first_instance_offset;

    /// Offsets of the minDepth and maxDepth push constants.
    std::optional<DepthRangeOffsets> depth_range_offsets;

    /// Options used to map WGSL textureNumLevels/textureNumSamples builtins to internal uniform
    /// buffer values. If not specified, emits corresponding GLSL builtins
    /// textureQueryLevels/textureSamples directly.
    TextureBuiltinsFromUniformOptions texture_builtins_from_uniform = {};

    /// Reflect the fields of this class so that it can be used by tint::ForeachField()
    TINT_REFLECT(Options,
                 disable_robustness,
                 disable_workgroup_init,
                 disable_polyfill_integer_div_mod,
                 version,
                 binding_map,
                 placeholder_binding_point,
                 binding_remapper_options,
                 external_texture_options,
                 first_instance_offset,
                 depth_range_offsets,
                 texture_builtins_from_uniform);
};

}  // namespace tint::glsl::writer

#endif  // SRC_TINT_LANG_GLSL_WRITER_COMMON_OPTIONS_H_