// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#pragma once

#include <span>
#include <boost/container/static_vector.hpp>
#include "common/assert.h"
#include "common/types.h"
#include "shader_recompiler/ir/attribute.h"
#include "shader_recompiler/ir/reg.h"
#include "shader_recompiler/ir/type.h"
#include "video_core/amdgpu/pixel_format.h"

namespace Shader {

static constexpr size_t NumUserDataRegs = 16;

enum class Stage : u32 {
    Vertex,
    TessellationControl,
    TessellationEval,
    Geometry,
    Fragment,
    Compute,
};
constexpr u32 MaxStageTypes = 6;

[[nodiscard]] constexpr Stage StageFromIndex(size_t index) noexcept {
    return static_cast<Stage>(static_cast<size_t>(Stage::Vertex) + index);
}

enum class TextureType : u32 {
    Color1D,
    ColorArray1D,
    Color2D,
    ColorArray2D,
    Color3D,
    ColorCube,
    Buffer,
};
constexpr u32 NUM_TEXTURE_TYPES = 7;

struct BufferResource {
    u32 sgpr_base;
    u32 dword_offset;
    u32 stride;
    u32 num_records;
    IR::Type used_types;
    bool is_storage;

    auto operator<=>(const BufferResource&) const = default;
};
using BufferResourceList = boost::container::static_vector<BufferResource, 8>;

struct Info {
    struct VsInput {
        AmdGpu::NumberFormat fmt;
        u16 binding;
        u16 num_components;
        u8 sgpr_base;
        u8 dword_offset;
    };
    boost::container::static_vector<VsInput, 32> vs_inputs{};

    struct PsInput {
        u32 param_index;
        u32 semantic;
        bool is_default;
        bool is_flat;
        u32 default_value;
    };
    boost::container::static_vector<PsInput, 32> ps_inputs{};

    struct AttributeFlags {
        bool Get(IR::Attribute attrib, u32 comp = 0) const {
            return flags[Index(attrib)] & (1 << comp);
        }

        bool GetAny(IR::Attribute attrib) const {
            return flags[Index(attrib)];
        }

        void Set(IR::Attribute attrib, u32 comp = 0) {
            flags[Index(attrib)] |= (1 << comp);
        }

        u32 NumComponents(IR::Attribute attrib) const {
            const u8 mask = flags[Index(attrib)];
            ASSERT(mask != 0b1011 || mask != 0b1101);
            return std::popcount(mask);
        }

        static size_t Index(IR::Attribute attrib) {
            return static_cast<size_t>(attrib);
        }

        std::array<u8, IR::NumAttributes> flags;
    };
    AttributeFlags loads{};
    AttributeFlags stores{};

    BufferResourceList buffers;
    std::span<const u32> user_data;
    Stage stage;

    template <typename T>
    T ReadUd(u32 ptr_index, u32 dword_offset) const noexcept {
        T data;
        const u32* base = user_data.data();
        if (ptr_index != IR::NumScalarRegs) {
            std::memcpy(&base, &user_data[ptr_index], sizeof(base));
        }
        std::memcpy(&data, base + dword_offset, sizeof(T));
        return data;
    }
};

} // namespace Shader

template <>
struct fmt::formatter<Shader::Stage> {
    constexpr auto parse(format_parse_context& ctx) {
        return ctx.begin();
    }
    auto format(const Shader::Stage& stage, format_context& ctx) const {
        constexpr static std::array names = {"vs", "tc", "te", "gs", "fs", "cs"};
        return fmt::format_to(ctx.out(), "{}", names[static_cast<size_t>(stage)]);
    }
};