// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#include "shader_recompiler/backend/spirv/emit_spirv_instructions.h"
#include "shader_recompiler/backend/spirv/spirv_emit_context.h"

namespace Shader::Backend::SPIRV {
namespace {
std::pair<Id, Id> AtomicArgs(EmitContext& ctx) {
    const Id scope{ctx.ConstU32(static_cast<u32>(spv::Scope::Device))};
    const Id semantics{ctx.u32_zero_value};
    return {scope, semantics};
}

Id SharedAtomicU32(EmitContext& ctx, Id offset, Id value,
                   Id (Sirit::Module::*atomic_func)(Id, Id, Id, Id, Id)) {
    const Id shift_id{ctx.ConstU32(2U)};
    const Id index{ctx.OpShiftRightArithmetic(ctx.U32[1], offset, shift_id)};
    const Id pointer{ctx.OpAccessChain(ctx.shared_u32, ctx.shared_memory_u32, index)};
    const auto [scope, semantics]{AtomicArgs(ctx)};
    return (ctx.*atomic_func)(ctx.U32[1], pointer, scope, semantics, value);
}

Id BufferAtomicU32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id address, Id value,
                   Id (Sirit::Module::*atomic_func)(Id, Id, Id, Id, Id)) {
    auto& buffer = ctx.buffers[handle];
    address = ctx.OpIAdd(ctx.U32[1], address, buffer.offset);
    const Id index = ctx.OpShiftRightLogical(ctx.U32[1], address, ctx.ConstU32(2u));
    const Id ptr = ctx.OpAccessChain(buffer.pointer_type, buffer.id, ctx.u32_zero_value, index);
    const auto [scope, semantics]{AtomicArgs(ctx)};
    return (ctx.*atomic_func)(ctx.U32[1], ptr, scope, semantics, value);
}

Id ImageAtomicU32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id coords, Id value,
                  Id (Sirit::Module::*atomic_func)(Id, Id, Id, Id, Id)) {
    const auto& texture = ctx.images[handle & 0xFFFF];
    const Id pointer{ctx.OpImageTexelPointer(ctx.image_u32, texture.id, coords, ctx.ConstU32(0U))};
    const auto [scope, semantics]{AtomicArgs(ctx)};
    return (ctx.*atomic_func)(ctx.U32[1], pointer, scope, semantics, value);
}
} // Anonymous namespace

Id EmitSharedAtomicIAdd32(EmitContext& ctx, Id offset, Id value) {
    return SharedAtomicU32(ctx, offset, value, &Sirit::Module::OpAtomicIAdd);
}

Id EmitSharedAtomicUMax32(EmitContext& ctx, Id offset, Id value) {
    return SharedAtomicU32(ctx, offset, value, &Sirit::Module::OpAtomicUMax);
}

Id EmitSharedAtomicSMax32(EmitContext& ctx, Id offset, Id value) {
    return SharedAtomicU32(ctx, offset, value, &Sirit::Module::OpAtomicSMax);
}

Id EmitSharedAtomicUMin32(EmitContext& ctx, Id offset, Id value) {
    return SharedAtomicU32(ctx, offset, value, &Sirit::Module::OpAtomicUMin);
}

Id EmitSharedAtomicSMin32(EmitContext& ctx, Id offset, Id value) {
    return SharedAtomicU32(ctx, offset, value, &Sirit::Module::OpAtomicSMin);
}

Id EmitBufferAtomicIAdd32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id address, Id value) {
    return BufferAtomicU32(ctx, inst, handle, address, value, &Sirit::Module::OpAtomicIAdd);
}

Id EmitBufferAtomicSMin32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id address, Id value) {
    return BufferAtomicU32(ctx, inst, handle, address, value, &Sirit::Module::OpAtomicSMin);
}

Id EmitBufferAtomicUMin32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id address, Id value) {
    return BufferAtomicU32(ctx, inst, handle, address, value, &Sirit::Module::OpAtomicUMin);
}

Id EmitBufferAtomicSMax32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id address, Id value) {
    return BufferAtomicU32(ctx, inst, handle, address, value, &Sirit::Module::OpAtomicSMax);
}

Id EmitBufferAtomicUMax32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id address, Id value) {
    return BufferAtomicU32(ctx, inst, handle, address, value, &Sirit::Module::OpAtomicUMax);
}

Id EmitBufferAtomicInc32(EmitContext&, IR::Inst*, u32, Id, Id) {
    // TODO
    UNREACHABLE_MSG("Unsupported BUFFER_ATOMIC opcode: ", IR::Opcode::BufferAtomicInc32);
}

Id EmitBufferAtomicDec32(EmitContext&, IR::Inst*, u32, Id, Id) {
    // TODO
    UNREACHABLE_MSG("Unsupported BUFFER_ATOMIC opcode: ", IR::Opcode::BufferAtomicDec32);
}

Id EmitBufferAtomicAnd32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id address, Id value) {
    return BufferAtomicU32(ctx, inst, handle, address, value, &Sirit::Module::OpAtomicAnd);
}

Id EmitBufferAtomicOr32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id address, Id value) {
    return BufferAtomicU32(ctx, inst, handle, address, value, &Sirit::Module::OpAtomicOr);
}

Id EmitBufferAtomicXor32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id address, Id value) {
    return BufferAtomicU32(ctx, inst, handle, address, value, &Sirit::Module::OpAtomicXor);
}

Id EmitBufferAtomicSwap32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id address, Id value) {
    return BufferAtomicU32(ctx, inst, handle, address, value, &Sirit::Module::OpAtomicExchange);
}

Id EmitImageAtomicIAdd32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id coords, Id value) {
    return ImageAtomicU32(ctx, inst, handle, coords, value, &Sirit::Module::OpAtomicIAdd);
}

Id EmitImageAtomicSMin32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id coords, Id value) {
    return ImageAtomicU32(ctx, inst, handle, coords, value, &Sirit::Module::OpAtomicSMin);
}

Id EmitImageAtomicUMin32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id coords, Id value) {
    return ImageAtomicU32(ctx, inst, handle, coords, value, &Sirit::Module::OpAtomicUMin);
}

Id EmitImageAtomicSMax32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id coords, Id value) {
    return ImageAtomicU32(ctx, inst, handle, coords, value, &Sirit::Module::OpAtomicSMax);
}

Id EmitImageAtomicUMax32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id coords, Id value) {
    return ImageAtomicU32(ctx, inst, handle, coords, value, &Sirit::Module::OpAtomicUMax);
}

Id EmitImageAtomicInc32(EmitContext&, IR::Inst*, u32, Id, Id) {
    // TODO: This is not yet implemented
    throw NotImplementedException("SPIR-V Instruction");
}

Id EmitImageAtomicDec32(EmitContext&, IR::Inst*, u32, Id, Id) {
    // TODO: This is not yet implemented
    throw NotImplementedException("SPIR-V Instruction");
}

Id EmitImageAtomicAnd32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id coords, Id value) {
    return ImageAtomicU32(ctx, inst, handle, coords, value, &Sirit::Module::OpAtomicAnd);
}

Id EmitImageAtomicOr32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id coords, Id value) {
    return ImageAtomicU32(ctx, inst, handle, coords, value, &Sirit::Module::OpAtomicOr);
}

Id EmitImageAtomicXor32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id coords, Id value) {
    return ImageAtomicU32(ctx, inst, handle, coords, value, &Sirit::Module::OpAtomicXor);
}

Id EmitImageAtomicExchange32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id coords, Id value) {
    return ImageAtomicU32(ctx, inst, handle, coords, value, &Sirit::Module::OpAtomicExchange);
}

} // namespace Shader::Backend::SPIRV