// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include "shader_recompiler/backend/spirv/emit_spirv.h"

namespace Shader::Backend::SPIRV {

void EmitGetRegister(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitSetRegister(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitGetPred(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitSetPred(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitSetGotoVariable(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitGetGotoVariable(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

static Id GetCbuf(EmitContext& ctx, Id result_type, Id UniformDefinitions::*member_ptr,
                  u32 element_size, const IR::Value& binding, const IR::Value& offset) {
    if (!binding.IsImmediate()) {
        throw NotImplementedException("Constant buffer indexing");
    }
    const Id cbuf{ctx.cbufs[binding.U32()].*member_ptr};
    const Id uniform_type{ctx.uniform_types.*member_ptr};
    if (!offset.IsImmediate()) {
        Id index{ctx.Def(offset)};
        if (element_size > 1) {
            const u32 log2_element_size{static_cast<u32>(std::countr_zero(element_size))};
            const Id shift{ctx.Constant(ctx.U32[1], log2_element_size)};
            index = ctx.OpShiftRightArithmetic(ctx.U32[1], ctx.Def(offset), shift);
        }
        const Id access_chain{ctx.OpAccessChain(uniform_type, cbuf, ctx.u32_zero_value, index)};
        return ctx.OpLoad(result_type, access_chain);
    }
    if (offset.U32() % element_size != 0) {
        throw NotImplementedException("Unaligned immediate constant buffer load");
    }
    const Id imm_offset{ctx.Constant(ctx.U32[1], offset.U32() / element_size)};
    const Id access_chain{ctx.OpAccessChain(uniform_type, cbuf, ctx.u32_zero_value, imm_offset)};
    return ctx.OpLoad(result_type, access_chain);
}

Id EmitGetCbufU8(EmitContext& ctx, const IR::Value& binding, const IR::Value& offset) {
    const Id load{GetCbuf(ctx, ctx.U8, &UniformDefinitions::U8, sizeof(u8), binding, offset)};
    return ctx.OpUConvert(ctx.U32[1], load);
}

Id EmitGetCbufS8(EmitContext& ctx, const IR::Value& binding, const IR::Value& offset) {
    const Id load{GetCbuf(ctx, ctx.S8, &UniformDefinitions::S8, sizeof(s8), binding, offset)};
    return ctx.OpSConvert(ctx.U32[1], load);
}

Id EmitGetCbufU16(EmitContext& ctx, const IR::Value& binding, const IR::Value& offset) {
    const Id load{GetCbuf(ctx, ctx.U16, &UniformDefinitions::U16, sizeof(u16), binding, offset)};
    return ctx.OpUConvert(ctx.U32[1], load);
}

Id EmitGetCbufS16(EmitContext& ctx, const IR::Value& binding, const IR::Value& offset) {
    const Id load{GetCbuf(ctx, ctx.S16, &UniformDefinitions::S16, sizeof(s16), binding, offset)};
    return ctx.OpSConvert(ctx.U32[1], load);
}

Id EmitGetCbufU32(EmitContext& ctx, const IR::Value& binding, const IR::Value& offset) {
    return GetCbuf(ctx, ctx.U32[1], &UniformDefinitions::U32, sizeof(u32), binding, offset);
}

Id EmitGetCbufF32(EmitContext& ctx, const IR::Value& binding, const IR::Value& offset) {
    return GetCbuf(ctx, ctx.F32[1], &UniformDefinitions::F32, sizeof(f32), binding, offset);
}

Id EmitGetCbufU64(EmitContext& ctx, const IR::Value& binding, const IR::Value& offset) {
    return GetCbuf(ctx, ctx.U64, &UniformDefinitions::U64, sizeof(u64), binding, offset);
}

void EmitGetAttribute(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitSetAttribute(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitGetAttributeIndexed(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitSetAttributeIndexed(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitGetZFlag(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitGetSFlag(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitGetCFlag(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitGetOFlag(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitSetZFlag(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitSetSFlag(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitSetCFlag(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

void EmitSetOFlag(EmitContext&) {
    throw NotImplementedException("SPIR-V Instruction");
}

Id EmitWorkgroupId(EmitContext& ctx) {
    return ctx.OpLoad(ctx.U32[3], ctx.workgroup_id);
}

Id EmitLocalInvocationId(EmitContext& ctx) {
    return ctx.OpLoad(ctx.U32[3], ctx.local_invocation_id);
}

} // namespace Shader::Backend::SPIRV