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dawn-cmake/src/transform/vertex_pulling.cc
Ben Clayton 12d54d746e transform: Make methods const, add ShouldRun() 
Transforms are supposed to be immutable, operating on the DataMaps provided for input and output, so make the methods const.

Add a ShouldRun() method which the Manager can use to skip over transforms that do not need to be run.

Change-Id: I320ac964577e94ac988748d8aca85bd43ee8d3b5
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/77120
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
2022-01-25 20:53:25 +00:00

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// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/transform/vertex_pulling.h"
#include <algorithm>
#include <utility>
#include "src/ast/assignment_statement.h"
#include "src/ast/bitcast_expression.h"
#include "src/ast/variable_decl_statement.h"
#include "src/program_builder.h"
#include "src/sem/variable.h"
#include "src/utils/map.h"
#include "src/utils/math.h"
TINT_INSTANTIATE_TYPEINFO(tint::transform::VertexPulling);
TINT_INSTANTIATE_TYPEINFO(tint::transform::VertexPulling::Config);
namespace tint {
namespace transform {
namespace {
/// The base type of a component.
/// The format type is either this type or a vector of this type.
enum class BaseType {
kInvalid,
kU32,
kI32,
kF32,
};
/// Writes the BaseType to the std::ostream.
/// @param out the std::ostream to write to
/// @param format the BaseType to write
/// @returns out so calls can be chained
std::ostream& operator<<(std::ostream& out, BaseType format) {
switch (format) {
case BaseType::kInvalid:
return out << "invalid";
case BaseType::kU32:
return out << "u32";
case BaseType::kI32:
return out << "i32";
case BaseType::kF32:
return out << "f32";
}
return out << "<unknown>";
}
/// Writes the VertexFormat to the std::ostream.
/// @param out the std::ostream to write to
/// @param format the VertexFormat to write
/// @returns out so calls can be chained
std::ostream& operator<<(std::ostream& out, VertexFormat format) {
switch (format) {
case VertexFormat::kUint8x2:
return out << "uint8x2";
case VertexFormat::kUint8x4:
return out << "uint8x4";
case VertexFormat::kSint8x2:
return out << "sint8x2";
case VertexFormat::kSint8x4:
return out << "sint8x4";
case VertexFormat::kUnorm8x2:
return out << "unorm8x2";
case VertexFormat::kUnorm8x4:
return out << "unorm8x4";
case VertexFormat::kSnorm8x2:
return out << "snorm8x2";
case VertexFormat::kSnorm8x4:
return out << "snorm8x4";
case VertexFormat::kUint16x2:
return out << "uint16x2";
case VertexFormat::kUint16x4:
return out << "uint16x4";
case VertexFormat::kSint16x2:
return out << "sint16x2";
case VertexFormat::kSint16x4:
return out << "sint16x4";
case VertexFormat::kUnorm16x2:
return out << "unorm16x2";
case VertexFormat::kUnorm16x4:
return out << "unorm16x4";
case VertexFormat::kSnorm16x2:
return out << "snorm16x2";
case VertexFormat::kSnorm16x4:
return out << "snorm16x4";
case VertexFormat::kFloat16x2:
return out << "float16x2";
case VertexFormat::kFloat16x4:
return out << "float16x4";
case VertexFormat::kFloat32:
return out << "float32";
case VertexFormat::kFloat32x2:
return out << "float32x2";
case VertexFormat::kFloat32x3:
return out << "float32x3";
case VertexFormat::kFloat32x4:
return out << "float32x4";
case VertexFormat::kUint32:
return out << "uint32";
case VertexFormat::kUint32x2:
return out << "uint32x2";
case VertexFormat::kUint32x3:
return out << "uint32x3";
case VertexFormat::kUint32x4:
return out << "uint32x4";
case VertexFormat::kSint32:
return out << "sint32";
case VertexFormat::kSint32x2:
return out << "sint32x2";
case VertexFormat::kSint32x3:
return out << "sint32x3";
case VertexFormat::kSint32x4:
return out << "sint32x4";
}
return out << "<unknown>";
}
/// A vertex attribute data format.
struct DataType {
BaseType base_type;
uint32_t width; // 1 for scalar, 2+ for a vector
};
DataType DataTypeOf(const sem::Type* ty) {
if (ty->Is<sem::I32>()) {
return {BaseType::kI32, 1};
}
if (ty->Is<sem::U32>()) {
return {BaseType::kU32, 1};
}
if (ty->Is<sem::F32>()) {
return {BaseType::kF32, 1};
}
if (auto* vec = ty->As<sem::Vector>()) {
return {DataTypeOf(vec->type()).base_type, vec->Width()};
}
return {BaseType::kInvalid, 0};
}
DataType DataTypeOf(VertexFormat format) {
switch (format) {
case VertexFormat::kUint32:
return {BaseType::kU32, 1};
case VertexFormat::kUint8x2:
case VertexFormat::kUint16x2:
case VertexFormat::kUint32x2:
return {BaseType::kU32, 2};
case VertexFormat::kUint32x3:
return {BaseType::kU32, 3};
case VertexFormat::kUint8x4:
case VertexFormat::kUint16x4:
case VertexFormat::kUint32x4:
return {BaseType::kU32, 4};
case VertexFormat::kSint32:
return {BaseType::kI32, 1};
case VertexFormat::kSint8x2:
case VertexFormat::kSint16x2:
case VertexFormat::kSint32x2:
return {BaseType::kI32, 2};
case VertexFormat::kSint32x3:
return {BaseType::kI32, 3};
case VertexFormat::kSint8x4:
case VertexFormat::kSint16x4:
case VertexFormat::kSint32x4:
return {BaseType::kI32, 4};
case VertexFormat::kFloat32:
return {BaseType::kF32, 1};
case VertexFormat::kUnorm8x2:
case VertexFormat::kSnorm8x2:
case VertexFormat::kUnorm16x2:
case VertexFormat::kSnorm16x2:
case VertexFormat::kFloat16x2:
case VertexFormat::kFloat32x2:
return {BaseType::kF32, 2};
case VertexFormat::kFloat32x3:
return {BaseType::kF32, 3};
case VertexFormat::kUnorm8x4:
case VertexFormat::kSnorm8x4:
case VertexFormat::kUnorm16x4:
case VertexFormat::kSnorm16x4:
case VertexFormat::kFloat16x4:
case VertexFormat::kFloat32x4:
return {BaseType::kF32, 4};
}
return {BaseType::kInvalid, 0};
}
struct State {
State(CloneContext& context, const VertexPulling::Config& c)
: ctx(context), cfg(c) {}
State(const State&) = default;
~State() = default;
/// LocationReplacement describes an ast::Variable replacement for a
/// location input.
struct LocationReplacement {
/// The variable to replace in the source Program
ast::Variable* from;
/// The replacement to use in the target ProgramBuilder
ast::Variable* to;
};
struct LocationInfo {
std::function<const ast::Expression*()> expr;
const sem::Type* type;
};
CloneContext& ctx;
VertexPulling::Config const cfg;
std::unordered_map<uint32_t, LocationInfo> location_info;
std::function<const ast::Expression*()> vertex_index_expr = nullptr;
std::function<const ast::Expression*()> instance_index_expr = nullptr;
Symbol pulling_position_name;
Symbol struct_buffer_name;
std::unordered_map<uint32_t, Symbol> vertex_buffer_names;
ast::VariableList new_function_parameters;
/// Generate the vertex buffer binding name
/// @param index index to append to buffer name
Symbol GetVertexBufferName(uint32_t index) {
return utils::GetOrCreate(vertex_buffer_names, index, [&] {
static const char kVertexBufferNamePrefix[] =
"tint_pulling_vertex_buffer_";
return ctx.dst->Symbols().New(kVertexBufferNamePrefix +
std::to_string(index));
});
}
/// Lazily generates the structure buffer symbol
Symbol GetStructBufferName() {
if (!struct_buffer_name.IsValid()) {
static const char kStructBufferName[] = "tint_vertex_data";
struct_buffer_name = ctx.dst->Symbols().New(kStructBufferName);
}
return struct_buffer_name;
}
/// Adds storage buffer decorated variables for the vertex buffers
void AddVertexStorageBuffers() {
// Creating the struct type
static const char kStructName[] = "TintVertexData";
auto* struct_type = ctx.dst->Structure(
ctx.dst->Symbols().New(kStructName),
{
ctx.dst->Member(GetStructBufferName(),
ctx.dst->ty.array<ProgramBuilder::u32>(4)),
});
for (uint32_t i = 0; i < cfg.vertex_state.size(); ++i) {
// The decorated variable with struct type
ctx.dst->Global(
GetVertexBufferName(i), ctx.dst->ty.Of(struct_type),
ast::StorageClass::kStorage, ast::Access::kRead,
ast::DecorationList{
ctx.dst->create<ast::BindingDecoration>(i),
ctx.dst->create<ast::GroupDecoration>(cfg.pulling_group),
});
}
}
/// Creates and returns the assignment to the variables from the buffers
ast::BlockStatement* CreateVertexPullingPreamble() {
// Assign by looking at the vertex descriptor to find attributes with
// matching location.
ast::StatementList stmts;
for (uint32_t buffer_idx = 0; buffer_idx < cfg.vertex_state.size();
++buffer_idx) {
const VertexBufferLayoutDescriptor& buffer_layout =
cfg.vertex_state[buffer_idx];
if ((buffer_layout.array_stride & 3) != 0) {
ctx.dst->Diagnostics().add_error(
diag::System::Transform,
"WebGPU requires that vertex stride must be a multiple of 4 bytes, "
"but VertexPulling array stride for buffer " +
std::to_string(buffer_idx) + " was " +
std::to_string(buffer_layout.array_stride) + " bytes");
return nullptr;
}
auto* index_expr = buffer_layout.step_mode == VertexStepMode::kVertex
? vertex_index_expr()
: instance_index_expr();
// buffer_array_base is the base array offset for all the vertex
// attributes. These are units of uint (4 bytes).
auto buffer_array_base = ctx.dst->Symbols().New(
"buffer_array_base_" + std::to_string(buffer_idx));
auto* attribute_offset = index_expr;
if (buffer_layout.array_stride != 4) {
attribute_offset =
ctx.dst->Mul(index_expr, buffer_layout.array_stride / 4u);
}
// let pulling_offset_n = <attribute_offset>
stmts.emplace_back(ctx.dst->Decl(
ctx.dst->Const(buffer_array_base, nullptr, attribute_offset)));
for (const VertexAttributeDescriptor& attribute_desc :
buffer_layout.attributes) {
auto it = location_info.find(attribute_desc.shader_location);
if (it == location_info.end()) {
continue;
}
auto& var = it->second;
// Data type of the target WGSL variable
auto var_dt = DataTypeOf(var.type);
// Data type of the vertex stream attribute
auto fmt_dt = DataTypeOf(attribute_desc.format);
// Base types must match between the vertex stream and the WGSL variable
if (var_dt.base_type != fmt_dt.base_type) {
std::stringstream err;
err << "VertexAttributeDescriptor for location "
<< std::to_string(attribute_desc.shader_location)
<< " has format " << attribute_desc.format
<< " but shader expects "
<< var.type->FriendlyName(ctx.src->Symbols());
ctx.dst->Diagnostics().add_error(diag::System::Transform, err.str());
return nullptr;
}
// Load the attribute value
auto* fetch = Fetch(buffer_array_base, attribute_desc.offset,
buffer_idx, attribute_desc.format);
// The attribute value may not be of the desired vector width. If it is
// not, we'll need to either reduce the width with a swizzle, or append
// 0's and / or a 1.
auto* value = fetch;
if (var_dt.width < fmt_dt.width) {
// WGSL variable vector width is smaller than the loaded vector width
switch (var_dt.width) {
case 1:
value = ctx.dst->MemberAccessor(fetch, "x");
break;
case 2:
value = ctx.dst->MemberAccessor(fetch, "xy");
break;
case 3:
value = ctx.dst->MemberAccessor(fetch, "xyz");
break;
default:
TINT_UNREACHABLE(Transform, ctx.dst->Diagnostics())
<< var_dt.width;
return nullptr;
}
} else if (var_dt.width > fmt_dt.width) {
// WGSL variable vector width is wider than the loaded vector width
const ast::Type* ty = nullptr;
ast::ExpressionList values{fetch};
switch (var_dt.base_type) {
case BaseType::kI32:
ty = ctx.dst->ty.i32();
for (uint32_t i = fmt_dt.width; i < var_dt.width; i++) {
values.emplace_back(ctx.dst->Expr((i == 3) ? 1 : 0));
}
break;
case BaseType::kU32:
ty = ctx.dst->ty.u32();
for (uint32_t i = fmt_dt.width; i < var_dt.width; i++) {
values.emplace_back(ctx.dst->Expr((i == 3) ? 1u : 0u));
}
break;
case BaseType::kF32:
ty = ctx.dst->ty.f32();
for (uint32_t i = fmt_dt.width; i < var_dt.width; i++) {
values.emplace_back(ctx.dst->Expr((i == 3) ? 1.f : 0.f));
}
break;
default:
TINT_UNREACHABLE(Transform, ctx.dst->Diagnostics())
<< var_dt.base_type;
return nullptr;
}
value = ctx.dst->Construct(ctx.dst->ty.vec(ty, var_dt.width), values);
}
// Assign the value to the WGSL variable
stmts.emplace_back(ctx.dst->Assign(var.expr(), value));
}
}
if (stmts.empty()) {
return nullptr;
}
return ctx.dst->create<ast::BlockStatement>(stmts);
}
/// Generates an expression reading from a buffer a specific format.
/// @param array_base the symbol of the variable holding the base array offset
/// of the vertex array (each index is 4-bytes).
/// @param offset the byte offset of the data from `buffer_base`
/// @param buffer the index of the vertex buffer
/// @param format the format to read
const ast::Expression* Fetch(Symbol array_base,
uint32_t offset,
uint32_t buffer,
VertexFormat format) {
using u32 = ProgramBuilder::u32;
using i32 = ProgramBuilder::i32;
using f32 = ProgramBuilder::f32;
// Returns a u32 loaded from buffer_base + offset.
auto load_u32 = [&] {
return LoadPrimitive(array_base, offset, buffer, VertexFormat::kUint32);
};
// Returns a i32 loaded from buffer_base + offset.
auto load_i32 = [&] { return ctx.dst->Bitcast<i32>(load_u32()); };
// Returns a u32 loaded from buffer_base + offset + 4.
auto load_next_u32 = [&] {
return LoadPrimitive(array_base, offset + 4, buffer,
VertexFormat::kUint32);
};
// Returns a i32 loaded from buffer_base + offset + 4.
auto load_next_i32 = [&] { return ctx.dst->Bitcast<i32>(load_next_u32()); };
// Returns a u16 loaded from offset, packed in the high 16 bits of a u32.
// The low 16 bits are 0.
// `min_alignment` must be a power of two.
// `offset` must be `min_alignment` bytes aligned.
auto load_u16_h = [&] {
auto low_u32_offset = offset & ~3u;
auto* low_u32 = LoadPrimitive(array_base, low_u32_offset, buffer,
VertexFormat::kUint32);
switch (offset & 3) {
case 0:
return ctx.dst->Shl(low_u32, 16u);
case 1:
return ctx.dst->And(ctx.dst->Shl(low_u32, 8u), 0xffff0000u);
case 2:
return ctx.dst->And(low_u32, 0xffff0000u);
default: { // 3:
auto* high_u32 = LoadPrimitive(array_base, low_u32_offset + 4, buffer,
VertexFormat::kUint32);
auto* shr = ctx.dst->Shr(low_u32, 8u);
auto* shl = ctx.dst->Shl(high_u32, 24u);
return ctx.dst->And(ctx.dst->Or(shl, shr), 0xffff0000u);
}
}
};
// Returns a u16 loaded from offset, packed in the low 16 bits of a u32.
// The high 16 bits are 0.
auto load_u16_l = [&] {
auto low_u32_offset = offset & ~3u;
auto* low_u32 = LoadPrimitive(array_base, low_u32_offset, buffer,
VertexFormat::kUint32);
switch (offset & 3) {
case 0:
return ctx.dst->And(low_u32, 0xffffu);
case 1:
return ctx.dst->And(ctx.dst->Shr(low_u32, 8u), 0xffffu);
case 2:
return ctx.dst->Shr(low_u32, 16u);
default: { // 3:
auto* high_u32 = LoadPrimitive(array_base, low_u32_offset + 4, buffer,
VertexFormat::kUint32);
auto* shr = ctx.dst->Shr(low_u32, 24u);
auto* shl = ctx.dst->Shl(high_u32, 8u);
return ctx.dst->And(ctx.dst->Or(shl, shr), 0xffffu);
}
}
};
// Returns a i16 loaded from offset, packed in the high 16 bits of a u32.
// The low 16 bits are 0.
auto load_i16_h = [&] { return ctx.dst->Bitcast<i32>(load_u16_h()); };
// Assumptions are made that alignment must be at least as large as the size
// of a single component.
switch (format) {
// Basic primitives
case VertexFormat::kUint32:
case VertexFormat::kSint32:
case VertexFormat::kFloat32:
return LoadPrimitive(array_base, offset, buffer, format);
// Vectors of basic primitives
case VertexFormat::kUint32x2:
return LoadVec(array_base, offset, buffer, 4, ctx.dst->ty.u32(),
VertexFormat::kUint32, 2);
case VertexFormat::kUint32x3:
return LoadVec(array_base, offset, buffer, 4, ctx.dst->ty.u32(),
VertexFormat::kUint32, 3);
case VertexFormat::kUint32x4:
return LoadVec(array_base, offset, buffer, 4, ctx.dst->ty.u32(),
VertexFormat::kUint32, 4);
case VertexFormat::kSint32x2:
return LoadVec(array_base, offset, buffer, 4, ctx.dst->ty.i32(),
VertexFormat::kSint32, 2);
case VertexFormat::kSint32x3:
return LoadVec(array_base, offset, buffer, 4, ctx.dst->ty.i32(),
VertexFormat::kSint32, 3);
case VertexFormat::kSint32x4:
return LoadVec(array_base, offset, buffer, 4, ctx.dst->ty.i32(),
VertexFormat::kSint32, 4);
case VertexFormat::kFloat32x2:
return LoadVec(array_base, offset, buffer, 4, ctx.dst->ty.f32(),
VertexFormat::kFloat32, 2);
case VertexFormat::kFloat32x3:
return LoadVec(array_base, offset, buffer, 4, ctx.dst->ty.f32(),
VertexFormat::kFloat32, 3);
case VertexFormat::kFloat32x4:
return LoadVec(array_base, offset, buffer, 4, ctx.dst->ty.f32(),
VertexFormat::kFloat32, 4);
case VertexFormat::kUint8x2: {
// yyxx0000, yyxx0000
auto* u16s = ctx.dst->vec2<u32>(load_u16_h());
// xx000000, yyxx0000
auto* shl = ctx.dst->Shl(u16s, ctx.dst->vec2<u32>(8u, 0u));
// 000000xx, 000000yy
return ctx.dst->Shr(shl, ctx.dst->vec2<u32>(24u));
}
case VertexFormat::kUint8x4: {
// wwzzyyxx, wwzzyyxx, wwzzyyxx, wwzzyyxx
auto* u32s = ctx.dst->vec4<u32>(load_u32());
// xx000000, yyxx0000, zzyyxx00, wwzzyyxx
auto* shl = ctx.dst->Shl(u32s, ctx.dst->vec4<u32>(24u, 16u, 8u, 0u));
// 000000xx, 000000yy, 000000zz, 000000ww
return ctx.dst->Shr(shl, ctx.dst->vec4<u32>(24u));
}
case VertexFormat::kUint16x2: {
// yyyyxxxx, yyyyxxxx
auto* u32s = ctx.dst->vec2<u32>(load_u32());
// xxxx0000, yyyyxxxx
auto* shl = ctx.dst->Shl(u32s, ctx.dst->vec2<u32>(16u, 0u));
// 0000xxxx, 0000yyyy
return ctx.dst->Shr(shl, ctx.dst->vec2<u32>(16u));
}
case VertexFormat::kUint16x4: {
// yyyyxxxx, wwwwzzzz
auto* u32s = ctx.dst->vec2<u32>(load_u32(), load_next_u32());
// yyyyxxxx, yyyyxxxx, wwwwzzzz, wwwwzzzz
auto* xxyy = ctx.dst->MemberAccessor(u32s, "xxyy");
// xxxx0000, yyyyxxxx, zzzz0000, wwwwzzzz
auto* shl = ctx.dst->Shl(xxyy, ctx.dst->vec4<u32>(16u, 0u, 16u, 0u));
// 0000xxxx, 0000yyyy, 0000zzzz, 0000wwww
return ctx.dst->Shr(shl, ctx.dst->vec4<u32>(16u));
}
case VertexFormat::kSint8x2: {
// yyxx0000, yyxx0000
auto* i16s = ctx.dst->vec2<i32>(load_i16_h());
// xx000000, yyxx0000
auto* shl = ctx.dst->Shl(i16s, ctx.dst->vec2<u32>(8u, 0u));
// ssssssxx, ssssssyy
return ctx.dst->Shr(shl, ctx.dst->vec2<u32>(24u));
}
case VertexFormat::kSint8x4: {
// wwzzyyxx, wwzzyyxx, wwzzyyxx, wwzzyyxx
auto* i32s = ctx.dst->vec4<i32>(load_i32());
// xx000000, yyxx0000, zzyyxx00, wwzzyyxx
auto* shl = ctx.dst->Shl(i32s, ctx.dst->vec4<u32>(24u, 16u, 8u, 0u));
// ssssssxx, ssssssyy, sssssszz, ssssssww
return ctx.dst->Shr(shl, ctx.dst->vec4<u32>(24u));
}
case VertexFormat::kSint16x2: {
// yyyyxxxx, yyyyxxxx
auto* i32s = ctx.dst->vec2<i32>(load_i32());
// xxxx0000, yyyyxxxx
auto* shl = ctx.dst->Shl(i32s, ctx.dst->vec2<u32>(16u, 0u));
// ssssxxxx, ssssyyyy
return ctx.dst->Shr(shl, ctx.dst->vec2<u32>(16u));
}
case VertexFormat::kSint16x4: {
// yyyyxxxx, wwwwzzzz
auto* i32s = ctx.dst->vec2<i32>(load_i32(), load_next_i32());
// yyyyxxxx, yyyyxxxx, wwwwzzzz, wwwwzzzz
auto* xxyy = ctx.dst->MemberAccessor(i32s, "xxyy");
// xxxx0000, yyyyxxxx, zzzz0000, wwwwzzzz
auto* shl = ctx.dst->Shl(xxyy, ctx.dst->vec4<u32>(16u, 0u, 16u, 0u));
// ssssxxxx, ssssyyyy, sssszzzz, sssswwww
return ctx.dst->Shr(shl, ctx.dst->vec4<u32>(16u));
}
case VertexFormat::kUnorm8x2:
return ctx.dst->MemberAccessor(
ctx.dst->Call("unpack4x8unorm", load_u16_l()), "xy");
case VertexFormat::kSnorm8x2:
return ctx.dst->MemberAccessor(
ctx.dst->Call("unpack4x8snorm", load_u16_l()), "xy");
case VertexFormat::kUnorm8x4:
return ctx.dst->Call("unpack4x8unorm", load_u32());
case VertexFormat::kSnorm8x4:
return ctx.dst->Call("unpack4x8snorm", load_u32());
case VertexFormat::kUnorm16x2:
return ctx.dst->Call("unpack2x16unorm", load_u32());
case VertexFormat::kSnorm16x2:
return ctx.dst->Call("unpack2x16snorm", load_u32());
case VertexFormat::kFloat16x2:
return ctx.dst->Call("unpack2x16float", load_u32());
case VertexFormat::kUnorm16x4:
return ctx.dst->vec4<f32>(
ctx.dst->Call("unpack2x16unorm", load_u32()),
ctx.dst->Call("unpack2x16unorm", load_next_u32()));
case VertexFormat::kSnorm16x4:
return ctx.dst->vec4<f32>(
ctx.dst->Call("unpack2x16snorm", load_u32()),
ctx.dst->Call("unpack2x16snorm", load_next_u32()));
case VertexFormat::kFloat16x4:
return ctx.dst->vec4<f32>(
ctx.dst->Call("unpack2x16float", load_u32()),
ctx.dst->Call("unpack2x16float", load_next_u32()));
}
TINT_UNREACHABLE(Transform, ctx.dst->Diagnostics())
<< "format " << static_cast<int>(format);
return nullptr;
}
/// Generates an expression reading an aligned basic type (u32, i32, f32) from
/// a vertex buffer.
/// @param array_base the symbol of the variable holding the base array offset
/// of the vertex array (each index is 4-bytes).
/// @param offset the byte offset of the data from `buffer_base`
/// @param buffer the index of the vertex buffer
/// @param format VertexFormat::kUint32, VertexFormat::kSint32 or
/// VertexFormat::kFloat32
const ast::Expression* LoadPrimitive(Symbol array_base,
uint32_t offset,
uint32_t buffer,
VertexFormat format) {
const ast::Expression* u32 = nullptr;
if ((offset & 3) == 0) {
// Aligned load.
const ast ::Expression* index = nullptr;
if (offset > 0) {
index = ctx.dst->Add(array_base, offset / 4);
} else {
index = ctx.dst->Expr(array_base);
}
u32 = ctx.dst->IndexAccessor(
ctx.dst->MemberAccessor(GetVertexBufferName(buffer),
GetStructBufferName()),
index);
} else {
// Unaligned load
uint32_t offset_aligned = offset & ~3u;
auto* low = LoadPrimitive(array_base, offset_aligned, buffer,
VertexFormat::kUint32);
auto* high = LoadPrimitive(array_base, offset_aligned + 4u, buffer,
VertexFormat::kUint32);
uint32_t shift = 8u * (offset & 3u);
auto* low_shr = ctx.dst->Shr(low, shift);
auto* high_shl = ctx.dst->Shl(high, 32u - shift);
u32 = ctx.dst->Or(low_shr, high_shl);
}
switch (format) {
case VertexFormat::kUint32:
return u32;
case VertexFormat::kSint32:
return ctx.dst->Bitcast(ctx.dst->ty.i32(), u32);
case VertexFormat::kFloat32:
return ctx.dst->Bitcast(ctx.dst->ty.f32(), u32);
default:
break;
}
TINT_UNREACHABLE(Transform, ctx.dst->Diagnostics())
<< "invalid format for LoadPrimitive" << static_cast<int>(format);
return nullptr;
}
/// Generates an expression reading a vec2/3/4 from a vertex buffer.
/// @param array_base the symbol of the variable holding the base array offset
/// of the vertex array (each index is 4-bytes).
/// @param offset the byte offset of the data from `buffer_base`
/// @param buffer the index of the vertex buffer
/// @param element_stride stride between elements, in bytes
/// @param base_type underlying AST type
/// @param base_format underlying vertex format
/// @param count how many elements the vector has
const ast::Expression* LoadVec(Symbol array_base,
uint32_t offset,
uint32_t buffer,
uint32_t element_stride,
const ast::Type* base_type,
VertexFormat base_format,
uint32_t count) {
ast::ExpressionList expr_list;
for (uint32_t i = 0; i < count; ++i) {
// Offset read position by element_stride for each component
uint32_t primitive_offset = offset + element_stride * i;
expr_list.push_back(
LoadPrimitive(array_base, primitive_offset, buffer, base_format));
}
return ctx.dst->Construct(ctx.dst->create<ast::Vector>(base_type, count),
std::move(expr_list));
}
/// Process a non-struct entry point parameter.
/// Generate function-scope variables for location parameters, and record
/// vertex_index and instance_index builtins if present.
/// @param func the entry point function
/// @param param the parameter to process
void ProcessNonStructParameter(const ast::Function* func,
const ast::Variable* param) {
if (auto* location =
ast::GetDecoration<ast::LocationDecoration>(param->decorations)) {
// Create a function-scope variable to replace the parameter.
auto func_var_sym = ctx.Clone(param->symbol);
auto* func_var_type = ctx.Clone(param->type);
auto* func_var = ctx.dst->Var(func_var_sym, func_var_type);
ctx.InsertFront(func->body->statements, ctx.dst->Decl(func_var));
// Capture mapping from location to the new variable.
LocationInfo info;
info.expr = [this, func_var]() { return ctx.dst->Expr(func_var); };
info.type = ctx.src->Sem().Get(param)->Type();
location_info[location->value] = info;
} else if (auto* builtin = ast::GetDecoration<ast::BuiltinDecoration>(
param->decorations)) {
// Check for existing vertex_index and instance_index builtins.
if (builtin->builtin == ast::Builtin::kVertexIndex) {
vertex_index_expr = [this, param]() {
return ctx.dst->Expr(ctx.Clone(param->symbol));
};
} else if (builtin->builtin == ast::Builtin::kInstanceIndex) {
instance_index_expr = [this, param]() {
return ctx.dst->Expr(ctx.Clone(param->symbol));
};
}
new_function_parameters.push_back(ctx.Clone(param));
} else {
TINT_ICE(Transform, ctx.dst->Diagnostics())
<< "Invalid entry point parameter";
}
}
/// Process a struct entry point parameter.
/// If the struct has members with location attributes, push the parameter to
/// a function-scope variable and create a new struct parameter without those
/// attributes. Record expressions for members that are vertex_index and
/// instance_index builtins.
/// @param func the entry point function
/// @param param the parameter to process
/// @param struct_ty the structure type
void ProcessStructParameter(const ast::Function* func,
const ast::Variable* param,
const ast::Struct* struct_ty) {
auto param_sym = ctx.Clone(param->symbol);
// Process the struct members.
bool has_locations = false;
ast::StructMemberList members_to_clone;
for (auto* member : struct_ty->members) {
auto member_sym = ctx.Clone(member->symbol);
std::function<const ast::Expression*()> member_expr = [this, param_sym,
member_sym]() {
return ctx.dst->MemberAccessor(param_sym, member_sym);
};
if (auto* location = ast::GetDecoration<ast::LocationDecoration>(
member->decorations)) {
// Capture mapping from location to struct member.
LocationInfo info;
info.expr = member_expr;
info.type = ctx.src->Sem().Get(member)->Type();
location_info[location->value] = info;
has_locations = true;
} else if (auto* builtin = ast::GetDecoration<ast::BuiltinDecoration>(
member->decorations)) {
// Check for existing vertex_index and instance_index builtins.
if (builtin->builtin == ast::Builtin::kVertexIndex) {
vertex_index_expr = member_expr;
} else if (builtin->builtin == ast::Builtin::kInstanceIndex) {
instance_index_expr = member_expr;
}
members_to_clone.push_back(member);
} else {
TINT_ICE(Transform, ctx.dst->Diagnostics())
<< "Invalid entry point parameter";
}
}
if (!has_locations) {
// Nothing to do.
new_function_parameters.push_back(ctx.Clone(param));
return;
}
// Create a function-scope variable to replace the parameter.
auto* func_var = ctx.dst->Var(param_sym, ctx.Clone(param->type));
ctx.InsertFront(func->body->statements, ctx.dst->Decl(func_var));
if (!members_to_clone.empty()) {
// Create a new struct without the location attributes.
ast::StructMemberList new_members;
for (auto* member : members_to_clone) {
auto member_sym = ctx.Clone(member->symbol);
auto* member_type = ctx.Clone(member->type);
auto member_decos = ctx.Clone(member->decorations);
new_members.push_back(
ctx.dst->Member(member_sym, member_type, std::move(member_decos)));
}
auto* new_struct = ctx.dst->Structure(ctx.dst->Sym(), new_members);
// Create a new function parameter with this struct.
auto* new_param =
ctx.dst->Param(ctx.dst->Sym(), ctx.dst->ty.Of(new_struct));
new_function_parameters.push_back(new_param);
// Copy values from the new parameter to the function-scope variable.
for (auto* member : members_to_clone) {
auto member_name = ctx.Clone(member->symbol);
ctx.InsertFront(
func->body->statements,
ctx.dst->Assign(ctx.dst->MemberAccessor(func_var, member_name),
ctx.dst->MemberAccessor(new_param, member_name)));
}
}
}
/// Process an entry point function.
/// @param func the entry point function
void Process(const ast::Function* func) {
if (func->body->Empty()) {
return;
}
// Process entry point parameters.
for (auto* param : func->params) {
auto* sem = ctx.src->Sem().Get(param);
if (auto* str = sem->Type()->As<sem::Struct>()) {
ProcessStructParameter(func, param, str->Declaration());
} else {
ProcessNonStructParameter(func, param);
}
}
// Insert new parameters for vertex_index and instance_index if needed.
if (!vertex_index_expr) {
for (const VertexBufferLayoutDescriptor& layout : cfg.vertex_state) {
if (layout.step_mode == VertexStepMode::kVertex) {
auto name = ctx.dst->Symbols().New("tint_pulling_vertex_index");
new_function_parameters.push_back(
ctx.dst->Param(name, ctx.dst->ty.u32(),
{ctx.dst->Builtin(ast::Builtin::kVertexIndex)}));
vertex_index_expr = [this, name]() { return ctx.dst->Expr(name); };
break;
}
}
}
if (!instance_index_expr) {
for (const VertexBufferLayoutDescriptor& layout : cfg.vertex_state) {
if (layout.step_mode == VertexStepMode::kInstance) {
auto name = ctx.dst->Symbols().New("tint_pulling_instance_index");
new_function_parameters.push_back(
ctx.dst->Param(name, ctx.dst->ty.u32(),
{ctx.dst->Builtin(ast::Builtin::kInstanceIndex)}));
instance_index_expr = [this, name]() { return ctx.dst->Expr(name); };
break;
}
}
}
// Generate vertex pulling preamble.
if (auto* block = CreateVertexPullingPreamble()) {
ctx.InsertFront(func->body->statements, block);
}
// Rewrite the function header with the new parameters.
auto func_sym = ctx.Clone(func->symbol);
auto* ret_type = ctx.Clone(func->return_type);
auto* body = ctx.Clone(func->body);
auto decos = ctx.Clone(func->decorations);
auto ret_decos = ctx.Clone(func->return_type_decorations);
auto* new_func = ctx.dst->create<ast::Function>(
func->source, func_sym, new_function_parameters, ret_type, body,
std::move(decos), std::move(ret_decos));
ctx.Replace(func, new_func);
}
};
} // namespace
VertexPulling::VertexPulling() = default;
VertexPulling::~VertexPulling() = default;
void VertexPulling::Run(CloneContext& ctx,
const DataMap& inputs,
DataMap&) const {
auto cfg = cfg_;
if (auto* cfg_data = inputs.Get<Config>()) {
cfg = *cfg_data;
}
// Find entry point
auto* func = ctx.src->AST().Functions().Find(
ctx.src->Symbols().Get(cfg.entry_point_name),
ast::PipelineStage::kVertex);
if (func == nullptr) {
ctx.dst->Diagnostics().add_error(diag::System::Transform,
"Vertex stage entry point not found");
return;
}
// TODO(idanr): Need to check shader locations in descriptor cover all
// attributes
// TODO(idanr): Make sure we covered all error cases, to guarantee the
// following stages will pass
State state{ctx, cfg};
state.AddVertexStorageBuffers();
state.Process(func);
ctx.Clone();
}
VertexPulling::Config::Config() = default;
VertexPulling::Config::Config(const Config&) = default;
VertexPulling::Config::~Config() = default;
VertexPulling::Config& VertexPulling::Config::operator=(const Config&) =
default;
VertexBufferLayoutDescriptor::VertexBufferLayoutDescriptor() = default;
VertexBufferLayoutDescriptor::VertexBufferLayoutDescriptor(
uint32_t in_array_stride,
VertexStepMode in_step_mode,
std::vector<VertexAttributeDescriptor> in_attributes)
: array_stride(in_array_stride),
step_mode(in_step_mode),
attributes(std::move(in_attributes)) {}
VertexBufferLayoutDescriptor::VertexBufferLayoutDescriptor(
const VertexBufferLayoutDescriptor& other) = default;
VertexBufferLayoutDescriptor& VertexBufferLayoutDescriptor::operator=(
const VertexBufferLayoutDescriptor& other) = default;
VertexBufferLayoutDescriptor::~VertexBufferLayoutDescriptor() = default;
} // namespace transform
} // namespace tint
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