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dolphin/Source/Core/VideoCommon/VertexLoaderARM64.cpp

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// Copyright 2015 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "VideoCommon/VertexLoaderARM64.h"
#include <array>
#include "Common/CommonTypes.h"
#include "VideoCommon/CPMemory.h"
#include "VideoCommon/DataReader.h"
#include "VideoCommon/VertexLoaderManager.h"
using namespace Arm64Gen;
constexpr ARM64Reg src_reg = ARM64Reg::X0;
constexpr ARM64Reg dst_reg = ARM64Reg::X1;
constexpr ARM64Reg remaining_reg = ARM64Reg::W2;
constexpr ARM64Reg skipped_reg = ARM64Reg::W17;
constexpr ARM64Reg scratch1_reg = ARM64Reg::W16;
constexpr ARM64Reg scratch2_reg = ARM64Reg::W15;
constexpr ARM64Reg scratch3_reg = ARM64Reg::W14;
constexpr ARM64Reg saved_count = ARM64Reg::W12;
constexpr ARM64Reg stride_reg = ARM64Reg::X11;
constexpr ARM64Reg arraybase_reg = ARM64Reg::X10;
constexpr ARM64Reg scale_reg = ARM64Reg::X9;
static constexpr int GetLoadSize(int load_bytes)
{
if (load_bytes == 1)
return 1;
else if (load_bytes <= 2)
return 2;
else if (load_bytes <= 4)
return 4;
else if (load_bytes <= 8)
return 8;
else
return 16;
}
alignas(16) static const float scale_factors[] = {
1.0 / (1ULL << 0), 1.0 / (1ULL << 1), 1.0 / (1ULL << 2), 1.0 / (1ULL << 3),
1.0 / (1ULL << 4), 1.0 / (1ULL << 5), 1.0 / (1ULL << 6), 1.0 / (1ULL << 7),
1.0 / (1ULL << 8), 1.0 / (1ULL << 9), 1.0 / (1ULL << 10), 1.0 / (1ULL << 11),
1.0 / (1ULL << 12), 1.0 / (1ULL << 13), 1.0 / (1ULL << 14), 1.0 / (1ULL << 15),
1.0 / (1ULL << 16), 1.0 / (1ULL << 17), 1.0 / (1ULL << 18), 1.0 / (1ULL << 19),
1.0 / (1ULL << 20), 1.0 / (1ULL << 21), 1.0 / (1ULL << 22), 1.0 / (1ULL << 23),
1.0 / (1ULL << 24), 1.0 / (1ULL << 25), 1.0 / (1ULL << 26), 1.0 / (1ULL << 27),
1.0 / (1ULL << 28), 1.0 / (1ULL << 29), 1.0 / (1ULL << 30), 1.0 / (1ULL << 31),
};
VertexLoaderARM64::VertexLoaderARM64(const TVtxDesc& vtx_desc, const VAT& vtx_att)
: VertexLoaderBase(vtx_desc, vtx_att), m_float_emit(this)
{
AllocCodeSpace(4096);
const Common::ScopedJITPageWriteAndNoExecute enable_jit_page_writes;
ClearCodeSpace();
GenerateVertexLoader();
WriteProtect();
}
// Returns the register to use as the base and an offset from that register.
// For indexed attributes, the index is read into scratch1_reg, and then scratch1_reg with no offset
// is returned. For direct attributes, an offset from src_reg is returned.
std::pair<Arm64Gen::ARM64Reg, u32> VertexLoaderARM64::GetVertexAddr(CPArray array,
VertexComponentFormat attribute)
{
if (IsIndexed(attribute))
{
if (attribute == VertexComponentFormat::Index8)
{
LDURB(scratch1_reg, src_reg, m_src_ofs);
m_src_ofs += 1;
}
else // Index16
{
LDURH(scratch1_reg, src_reg, m_src_ofs);
m_src_ofs += 2;
REV16(scratch1_reg, scratch1_reg);
}
if (array == CPArray::Position)
{
EOR(scratch2_reg, scratch1_reg,
attribute == VertexComponentFormat::Index8 ? LogicalImm(0xFF, 32) :
LogicalImm(0xFFFF, 32));
m_skip_vertex = CBZ(scratch2_reg);
}
LDR(IndexType::Unsigned, scratch2_reg, stride_reg, static_cast<u8>(array) * 4);
MUL(scratch1_reg, scratch1_reg, scratch2_reg);
LDR(IndexType::Unsigned, EncodeRegTo64(scratch2_reg), arraybase_reg,
static_cast<u8>(array) * 8);
ADD(EncodeRegTo64(scratch1_reg), EncodeRegTo64(scratch1_reg), EncodeRegTo64(scratch2_reg));
return {EncodeRegTo64(scratch1_reg), 0};
}
else
{
return {src_reg, m_src_ofs};
}
}
void VertexLoaderARM64::ReadVertex(VertexComponentFormat attribute, ComponentFormat format,
int count_in, int count_out, bool dequantize,
u8 scaling_exponent, AttributeFormat* native_format,
ARM64Reg reg, u32 offset)
{
ARM64Reg coords = count_in == 3 ? ARM64Reg::Q31 : ARM64Reg::D31;
ARM64Reg scale = count_in == 3 ? ARM64Reg::Q30 : ARM64Reg::D30;
int elem_size = GetElementSize(format);
int load_bytes = elem_size * count_in;
int load_size = GetLoadSize(load_bytes);
load_size <<= 3;
m_float_emit.LDUR(load_size, coords, reg, offset);
if (format != ComponentFormat::Float)
{
// Extend and convert to float
switch (format)
{
case ComponentFormat::UByte:
m_float_emit.UXTL(8, EncodeRegToDouble(coords), EncodeRegToDouble(coords));
m_float_emit.UXTL(16, EncodeRegToDouble(coords), EncodeRegToDouble(coords));
break;
case ComponentFormat::Byte:
m_float_emit.SXTL(8, EncodeRegToDouble(coords), EncodeRegToDouble(coords));
m_float_emit.SXTL(16, EncodeRegToDouble(coords), EncodeRegToDouble(coords));
break;
case ComponentFormat::UShort:
m_float_emit.REV16(8, EncodeRegToDouble(coords), EncodeRegToDouble(coords));
m_float_emit.UXTL(16, EncodeRegToDouble(coords), EncodeRegToDouble(coords));
break;
case ComponentFormat::Short:
m_float_emit.REV16(8, EncodeRegToDouble(coords), EncodeRegToDouble(coords));
m_float_emit.SXTL(16, EncodeRegToDouble(coords), EncodeRegToDouble(coords));
break;
}
m_float_emit.SCVTF(32, coords, coords);
if (dequantize && scaling_exponent)
{
m_float_emit.LDR(32, IndexType::Unsigned, scale, scale_reg, scaling_exponent * 4);
m_float_emit.FMUL(32, coords, coords, scale, 0);
}
}
else
{
m_float_emit.REV32(8, coords, coords);
}
const u32 write_size = count_out == 3 ? 128 : count_out * 32;
m_float_emit.STUR(write_size, coords, dst_reg, m_dst_ofs);
// Z-Freeze
if (native_format == &m_native_vtx_decl.position)
{
CMP(remaining_reg, 3);
FixupBranch dont_store = B(CC_GE);
MOVP2R(EncodeRegTo64(scratch2_reg), VertexLoaderManager::position_cache.data());
m_float_emit.STR(128, coords, EncodeRegTo64(scratch2_reg), ArithOption(remaining_reg, true));
SetJumpTarget(dont_store);
}
else if (native_format == &m_native_vtx_decl.normals[1])
{
FixupBranch dont_store = CBNZ(remaining_reg);
MOVP2R(EncodeRegTo64(scratch2_reg), VertexLoaderManager::tangent_cache.data());
m_float_emit.STR(128, IndexType::Unsigned, coords, EncodeRegTo64(scratch2_reg), 0);
SetJumpTarget(dont_store);
}
else if (native_format == &m_native_vtx_decl.normals[2])
{
FixupBranch dont_store = CBNZ(remaining_reg);
MOVP2R(EncodeRegTo64(scratch2_reg), VertexLoaderManager::binormal_cache.data());
m_float_emit.STR(128, IndexType::Unsigned, coords, EncodeRegTo64(scratch2_reg), 0);
SetJumpTarget(dont_store);
}
native_format->components = count_out;
native_format->enable = true;
native_format->offset = m_dst_ofs;
native_format->type = ComponentFormat::Float;
native_format->integer = false;
m_dst_ofs += sizeof(float) * count_out;
if (attribute == VertexComponentFormat::Direct)
m_src_ofs += load_bytes;
}
void VertexLoaderARM64::ReadColor(VertexComponentFormat attribute, ColorFormat format, ARM64Reg reg,
u32 offset)
{
int load_bytes = 0;
switch (format)
{
case ColorFormat::RGB888:
case ColorFormat::RGB888x:
case ColorFormat::RGBA8888:
LDUR(scratch2_reg, reg, offset);
if (format != ColorFormat::RGBA8888)
ORR(scratch2_reg, scratch2_reg, LogicalImm(0xFF000000, 32));
STR(IndexType::Unsigned, scratch2_reg, dst_reg, m_dst_ofs);
load_bytes = format == ColorFormat::RGB888 ? 3 : 4;
break;
case ColorFormat::RGB565:
// RRRRRGGG GGGBBBBB
// AAAAAAAA BBBBBBBB GGGGGGGG RRRRRRRR
LDURH(scratch3_reg, reg, offset);
REV16(scratch3_reg, scratch3_reg);
// B
AND(scratch2_reg, scratch3_reg, LogicalImm(0x1F, 32));
ORR(scratch2_reg, ARM64Reg::WSP, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 3));
ORR(scratch2_reg, scratch2_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSR, 5));
ORR(scratch1_reg, ARM64Reg::WSP, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 16));
// G
UBFM(scratch2_reg, scratch3_reg, 5, 10);
ORR(scratch2_reg, ARM64Reg::WSP, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 2));
ORR(scratch2_reg, scratch2_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSR, 6));
ORR(scratch1_reg, scratch1_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 8));
// R
UBFM(scratch2_reg, scratch3_reg, 11, 15);
ORR(scratch1_reg, scratch1_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 3));
ORR(scratch1_reg, scratch1_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSR, 2));
// A
ORR(scratch1_reg, scratch1_reg, LogicalImm(0xFF000000, 32));
STR(IndexType::Unsigned, scratch1_reg, dst_reg, m_dst_ofs);
load_bytes = 2;
break;
case ColorFormat::RGBA4444:
// BBBBAAAA RRRRGGGG
// REV16 - RRRRGGGG BBBBAAAA
// AAAAAAAA BBBBBBBB GGGGGGGG RRRRRRRR
LDURH(scratch3_reg, reg, offset);
// R
UBFM(scratch1_reg, scratch3_reg, 4, 7);
// G
AND(scratch2_reg, scratch3_reg, LogicalImm(0xF, 32));
ORR(scratch1_reg, scratch1_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 8));
// B
UBFM(scratch2_reg, scratch3_reg, 12, 15);
ORR(scratch1_reg, scratch1_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 16));
// A
UBFM(scratch2_reg, scratch3_reg, 8, 11);
ORR(scratch1_reg, scratch1_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 24));
// Final duplication
ORR(scratch1_reg, scratch1_reg, scratch1_reg, ArithOption(scratch1_reg, ShiftType::LSL, 4));
STR(IndexType::Unsigned, scratch1_reg, dst_reg, m_dst_ofs);
load_bytes = 2;
break;
case ColorFormat::RGBA6666:
// RRRRRRGG GGGGBBBB BBAAAAAA
// AAAAAAAA BBBBBBBB GGGGGGGG RRRRRRRR
LDUR(scratch3_reg, reg, offset - 1);
REV32(scratch3_reg, scratch3_reg);
// A
UBFM(scratch2_reg, scratch3_reg, 0, 5);
ORR(scratch2_reg, ARM64Reg::WSP, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 2));
ORR(scratch2_reg, scratch2_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSR, 6));
ORR(scratch1_reg, ARM64Reg::WSP, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 24));
// B
UBFM(scratch2_reg, scratch3_reg, 6, 11);
ORR(scratch2_reg, ARM64Reg::WSP, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 2));
ORR(scratch2_reg, scratch2_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSR, 6));
ORR(scratch1_reg, scratch1_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 16));
// G
UBFM(scratch2_reg, scratch3_reg, 12, 17);
ORR(scratch2_reg, ARM64Reg::WSP, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 2));
ORR(scratch2_reg, scratch2_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSR, 6));
ORR(scratch1_reg, scratch1_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 8));
// R
UBFM(scratch2_reg, scratch3_reg, 18, 23);
ORR(scratch1_reg, scratch1_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSL, 2));
ORR(scratch1_reg, scratch1_reg, scratch2_reg, ArithOption(scratch2_reg, ShiftType::LSR, 4));
STR(IndexType::Unsigned, scratch1_reg, dst_reg, m_dst_ofs);
load_bytes = 3;
break;
}
if (attribute == VertexComponentFormat::Direct)
m_src_ofs += load_bytes;
}
void VertexLoaderARM64::GenerateVertexLoader()
{
// The largest input vertex (with the position matrix index and all texture matrix indices
// enabled, and all components set as direct) is 129 bytes (corresponding to a 156-byte
// output). This is small enough that we can always use the unscaled load/store instructions
// (which allow an offset from -256 to +255).
ASSERT(m_vertex_size <= 255);
// R0 - Source pointer
// R1 - Destination pointer
// R2 - Count
// R30 - LR
//
// R0 return how many
//
// Registers we don't have to worry about saving
// R9-R17 are caller saved temporaries
// R18 is a temporary or platform specific register(iOS)
//
// VFP registers
// We can touch all except v8-v15
// If we need to use those, we need to retain the lower 64bits(!) of the register
bool has_tc = false;
bool has_tc_scale = false;
for (size_t i = 0; i < m_VtxDesc.high.TexCoord.Size(); i++)
{
has_tc |= m_VtxDesc.high.TexCoord[i] != VertexComponentFormat::NotPresent;
has_tc_scale |= (m_VtxAttr.GetTexFrac(i) != 0);
}
bool need_scale = (m_VtxAttr.g0.ByteDequant && m_VtxAttr.g0.PosFrac) ||
(has_tc && has_tc_scale) ||
(m_VtxDesc.low.Normal != VertexComponentFormat::NotPresent);
AlignCode16();
if (IsIndexed(m_VtxDesc.low.Position))
MOV(skipped_reg, ARM64Reg::WZR);
ADD(saved_count, remaining_reg, 1);
MOVP2R(stride_reg, g_main_cp_state.array_strides.data());
MOVP2R(arraybase_reg, VertexLoaderManager::cached_arraybases.data());
if (need_scale)
MOVP2R(scale_reg, scale_factors);
const u8* loop_start = GetCodePtr();
if (m_VtxDesc.low.PosMatIdx)
{
LDRB(IndexType::Unsigned, scratch1_reg, src_reg, m_src_ofs);
AND(scratch1_reg, scratch1_reg, LogicalImm(0x3F, 32));
STR(IndexType::Unsigned, scratch1_reg, dst_reg, m_dst_ofs);
// Z-Freeze
CMP(remaining_reg, 3);
FixupBranch dont_store = B(CC_GE);
MOVP2R(EncodeRegTo64(scratch2_reg), VertexLoaderManager::position_matrix_index_cache.data());
STR(scratch1_reg, EncodeRegTo64(scratch2_reg), ArithOption(remaining_reg, true));
SetJumpTarget(dont_store);
m_native_vtx_decl.posmtx.components = 4;
m_native_vtx_decl.posmtx.enable = true;
m_native_vtx_decl.posmtx.offset = m_dst_ofs;
m_native_vtx_decl.posmtx.type = ComponentFormat::UByte;
m_native_vtx_decl.posmtx.integer = true;
m_src_ofs += sizeof(u8);
m_dst_ofs += sizeof(u32);
}
std::array<u32, 8> texmatidx_ofs;
for (size_t i = 0; i < m_VtxDesc.low.TexMatIdx.Size(); i++)
{
if (m_VtxDesc.low.TexMatIdx[i])
texmatidx_ofs[i] = m_src_ofs++;
}
// Position
{
const int pos_elements = m_VtxAttr.g0.PosElements == CoordComponentCount::XY ? 2 : 3;
const auto [reg, offset] = GetVertexAddr(CPArray::Position, m_VtxDesc.low.Position);
ReadVertex(m_VtxDesc.low.Position, m_VtxAttr.g0.PosFormat, pos_elements, pos_elements,
m_VtxAttr.g0.ByteDequant, m_VtxAttr.g0.PosFrac, &m_native_vtx_decl.position, reg,
offset);
}
if (m_VtxDesc.low.Normal != VertexComponentFormat::NotPresent)
{
static constexpr Common::EnumMap<u8, static_cast<ComponentFormat>(7)> SCALE_MAP = {7, 6, 15, 14,
0, 0, 0, 0};
const u8 scaling_exponent = SCALE_MAP[m_VtxAttr.g0.NormalFormat];
// Normal
auto [reg, offset] = GetVertexAddr(CPArray::Normal, m_VtxDesc.low.Normal);
ReadVertex(m_VtxDesc.low.Normal, m_VtxAttr.g0.NormalFormat, 3, 3, true, scaling_exponent,
&m_native_vtx_decl.normals[0], reg, offset);
if (m_VtxAttr.g0.NormalElements == NormalComponentCount::NTB)
{
const bool index3 = IsIndexed(m_VtxDesc.low.Normal) && m_VtxAttr.g0.NormalIndex3;
const int elem_size = GetElementSize(m_VtxAttr.g0.NormalFormat);
const int load_bytes = elem_size * 3;
// Tangent
// If in Index3 mode, and indexed components are used, replace the index with a new index.
if (index3)
std::tie(reg, offset) = GetVertexAddr(CPArray::Normal, m_VtxDesc.low.Normal);
// The tangent comes after the normal; even in index3 mode, an extra offset of load_bytes is
// applied. Note that this is different from adding 1 to the index, as the stride for indices
// may be different from the size of the tangent itself.
ReadVertex(m_VtxDesc.low.Normal, m_VtxAttr.g0.NormalFormat, 3, 3, true, scaling_exponent,
&m_native_vtx_decl.normals[1], reg, offset + load_bytes);
// Binormal
if (index3)
std::tie(reg, offset) = GetVertexAddr(CPArray::Normal, m_VtxDesc.low.Normal);
ReadVertex(m_VtxDesc.low.Normal, m_VtxAttr.g0.NormalFormat, 3, 3, true, scaling_exponent,
&m_native_vtx_decl.normals[2], reg, offset + load_bytes * 2);
}
}
for (u8 i = 0; i < m_VtxDesc.low.Color.Size(); i++)
{
m_native_vtx_decl.colors[i].components = 4;
m_native_vtx_decl.colors[i].type = ComponentFormat::UByte;
m_native_vtx_decl.colors[i].integer = false;
if (m_VtxDesc.low.Color[i] != VertexComponentFormat::NotPresent)
{
const auto [reg, offset] = GetVertexAddr(CPArray::Color0 + i, m_VtxDesc.low.Color[i]);
ReadColor(m_VtxDesc.low.Color[i], m_VtxAttr.GetColorFormat(i), reg, offset);
m_native_vtx_decl.colors[i].components = 4;
m_native_vtx_decl.colors[i].enable = true;
m_native_vtx_decl.colors[i].offset = m_dst_ofs;
m_native_vtx_decl.colors[i].type = ComponentFormat::UByte;
m_native_vtx_decl.colors[i].integer = false;
m_dst_ofs += 4;
}
}
for (u8 i = 0; i < m_VtxDesc.high.TexCoord.Size(); i++)
{
m_native_vtx_decl.texcoords[i].offset = m_dst_ofs;
m_native_vtx_decl.texcoords[i].type = ComponentFormat::Float;
m_native_vtx_decl.texcoords[i].integer = false;
const int elements = m_VtxAttr.GetTexElements(i) == TexComponentCount::S ? 1 : 2;
if (m_VtxDesc.high.TexCoord[i] != VertexComponentFormat::NotPresent)
{
const auto [reg, offset] = GetVertexAddr(CPArray::TexCoord0 + i, m_VtxDesc.high.TexCoord[i]);
u8 scaling_exponent = m_VtxAttr.GetTexFrac(i);
ReadVertex(m_VtxDesc.high.TexCoord[i], m_VtxAttr.GetTexFormat(i), elements,
m_VtxDesc.low.TexMatIdx[i] ? 2 : elements, m_VtxAttr.g0.ByteDequant,
scaling_exponent, &m_native_vtx_decl.texcoords[i], reg, offset);
}
if (m_VtxDesc.low.TexMatIdx[i])
{
m_native_vtx_decl.texcoords[i].components = 3;
m_native_vtx_decl.texcoords[i].enable = true;
m_native_vtx_decl.texcoords[i].type = ComponentFormat::Float;
m_native_vtx_decl.texcoords[i].integer = false;
LDRB(IndexType::Unsigned, scratch2_reg, src_reg, texmatidx_ofs[i]);
m_float_emit.UCVTF(ARM64Reg::S31, scratch2_reg);
if (m_VtxDesc.high.TexCoord[i] != VertexComponentFormat::NotPresent)
{
m_float_emit.STR(32, IndexType::Unsigned, ARM64Reg::D31, dst_reg, m_dst_ofs);
m_dst_ofs += sizeof(float);
}
else
{
m_native_vtx_decl.texcoords[i].offset = m_dst_ofs;
STUR(ARM64Reg::SP, dst_reg, m_dst_ofs);
m_float_emit.STR(32, IndexType::Unsigned, ARM64Reg::D31, dst_reg, m_dst_ofs + 8);
m_dst_ofs += sizeof(float) * 3;
}
}
}
// Prepare for the next vertex.
ADD(dst_reg, dst_reg, m_dst_ofs);
const u8* cont = GetCodePtr();
ADD(src_reg, src_reg, m_src_ofs);
SUBS(remaining_reg, remaining_reg, 1);
B(CCFlags::CC_GE, loop_start);
if (IsIndexed(m_VtxDesc.low.Position))
{
SUB(ARM64Reg::W0, saved_count, skipped_reg);
RET(ARM64Reg::X30);
SetJumpTarget(m_skip_vertex);
ADD(skipped_reg, skipped_reg, 1);
B(cont);
}
else
{
MOV(ARM64Reg::W0, saved_count);
RET(ARM64Reg::X30);
}
FlushIcache();
ASSERT(m_vertex_size == m_src_ofs);
m_native_vtx_decl.stride = m_dst_ofs;
}
int VertexLoaderARM64::RunVertices(DataReader src, DataReader dst, int count)
{
m_numLoadedVertices += count;
return ((int (*)(u8 * src, u8 * dst, int count)) region)(src.GetPointer(), dst.GetPointer(),
count - 1);
}
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