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WgslMinifier.cpp
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#include <string>
#include <string_view>
#include <array>
#include <vector>
#include <unordered_map>
#include <iostream>
#include <numeric>
#include <print>
#include <cassert>
#include <fstream>
#include <algorithm>
#include "tint_headers.h"
#include "wgsl_test.h"
#ifdef WGSLPACK_USE_COMPRESSION
#include "zstd.c"
#endif
#undef _CHAR
#undef IN
#undef DELETE
#undef INLINE
#undef FALSE
#undef TRUE
#undef CONST
#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#include <emscripten/bind.h>
#include <emscripten/val.h>
#define EXPORT_METHOD extern "C" EMSCRIPTEN_KEEPALIVE
#else
#define EXPORT_METHOD
#endif
enum WGSLTokenTypes : uint16_t {
_CHAR,
IDENTIFIER,
SHORTSWIZZLE,
SWIZZLE,
NEWLINE,
NUMBER4,
NUMBER8,
UNSIGNED_NUMBER4,
UNSIGNED_NUMBER8,
FLOAT4,
FLOAT8,
U, I,
IN, // 'in' keyword
// high frequency types
LET, VAR, IF, DOT, FMA, VEC2, VEC3, VEC4, VEC2I, VEC3I, VEC4I,
VEC2U, VEC3U, VEC4U, VEC2F, VEC3F, VEC4F, VEC2H, VEC3H, VEC4H,
BITCAST, CLAMP, SELECT, INVERSE_SQRT,
// Types
_BOOL, F32, F16, I32, _U32, ARRAY, ATOMIC,
// Matrix Types
MAT2X2F, MAT2X2H, MAT2X3F, MAT2X3H, MAT2X4F, MAT2X4H, MAT3X2F, MAT3X2H, MAT3X3F,
MAT3X3H, MAT3X4F, MAT3X4H, MAT4X2F, MAT4X2H, MAT4X3F, MAT4X3H, MAT4X4F, MAT4X4H,
// Operators
LEFT_PARAM, RIGHT_PARAM, LEFT_BRACKET, RIGHT_BRACKET, LEFT_ANGLE, RIGHT_ANGLE,
SEMICOLON, COMMA, PERIOD, ASSIGN, MINUS, PLUS, MULTIPLY, DIVIDE, NOT, OR, AND,
XOR, TILDE, MODULO, QUESTION, COLON, AT, HASH, DOLLAR, BANG, PIPE, AMPERSAND,
CARET, PERCENT, LEFT_CURLY, RIGHT_CURLY,
// Additional
NULLUC, SELF, ABSTRACT, ACTIVE, ALIGNAS, ALIGNOF, AS, ASM, ASM_FRAGMENT,
ASYNC, ATTRIBUTE, AUTO, AWAIT, BECOME, BINDING_ARRAY, CAST, CATCH, CLASS,
CO_AWAIT, CO_RETURN, CO_YIELD, COHERENT, COLUMN_MAJOR, COMMON, COMPILE,
COMPILE_FRAGMENT, CONCEPT, CONST_CAST, CONSTEVAL, CONSTEXPR, CONSTINIT,
CRATE, DEBUGGER, DECLTYPE, DELETE, DEMOTE, DEMOTE_TO_HELPER, DO,
DYNAMIC_CAST, ENUM, EXPLICIT, EXPORT, EXTENDS, EXTERNAL,
FILTER, FINAL, FINALLY, FRIEND, FROM, FXGROUP, GET, GOTO, GROUPSHARED,
HIGH, IMPLEMENTS, IMPORT, INLINE, INSTANCEOF, INTERFACE, LAYOUT, LOW,
MACRO, MATCH, MEDIUM, MODULE, MUTABLE, NAMESPACE, NODISCARD, NOEXCEPT,
NOINLINE, NOINTERPOLATION, NON_COHERENT, NONCOHERENT, NOPERSPECTIVE, NULLLC,
NULLPTR, OF, _OPERATOR, PACKAGE, PACKOFFSET, PARTITION, PASS, PATCH,
PIXELFRAGMENT, PRECISE, PRECISION, PREMERGE, PRIV, PROTECTED, PUB, PUBLIC,
READONLY, REF, REGARDLESS, REGISTER, REINTERPRET_CAST, REQUIRE, RESOURCE,
RESTRICT, SET, SHARED, SIZEOF, SMOOTH, SNORM, STATIC,
STATIC_CAST, STD, SUBROUTINE, SUPER, TARGET, TEMPLATE, THIS, THREAD_LOCAL,
THROW, TRAIT, TRY, TYPEDEF, TYPEID, TYPENAME, TYPEOF, UNION, UNLESS,
UNORM, UNSAFE, UNSIZED, USE, USING, VARYING, VIRTUAL, VOLATILE, WGSL, WHERE,
WITH, WRITEONLY, YIELD, LINEAR, FLAT, PERSPECTIVE,
// Other Types
PTR, SAMPLER,
SAMPLER_COMPARISON, TEXTURE_1D, TEXTURE_2D, TEXTURE_2D_ARRAY, TEXTURE_3D,
TEXTURE_CUBE, TEXTURE_CUBE_ARRAY, TEXTURE_MULTISAMPLED_2D, TEXTURE_STORAGE_1D,
TEXTURE_STORAGE_2D, TEXTURE_STORAGE_2D_ARRAY, TEXTURE_STORAGE_3D, TEXTURE_DEPTH_2D,
TEXTURE_DEPTH_2D_ARRAY, TEXTURE_DEPTH_CUBE, TEXTURE_DEPTH_CUBE_ARRAY,
TEXTURE_DEPTH_MULTISAMPLED_2D,
// Keywords
BREAK, CASE, CONTINUE, CONTINUING, DEFAULT, DISCARD, ELSE, ENABLE, FALLTHROUGH,
FALSE, FN, FOR, FUNCTION, LOOP, OVERRIDE, RETURN,
STRUCT, SWITCH, TRUE, TYPE, WHILE,
STATIC_ASSERT, DIAGNOSTIC_CONTROL, REQUIRES,
// Built-in functions
ABS, ACOS, ACOSH, ALL, ANY, ARRAY_LENGTH, ASIN, ASINH, ATAN, ATAN2,
ATANH, ATOMIC_ADD, ATOMIC_AND, ATOMIC_COMPARE_EXCHANGE_WEAK, ATOMIC_EXCHANGE,
ATOMIC_LOAD, ATOMIC_MAX, ATOMIC_MIN, ATOMIC_OR, ATOMIC_STORE, ATOMIC_SUB,
ATOMIC_XOR, CEIL, COS, COSH, COUNT_LEADING_ZEROS, COUNT_ONE_BITS,
COUNT_TRAILING_ZEROS, CROSS, DEGREES, DETERMINANT, DISTANCE, EXP,
EXP2, EXTRACT_BITS, FACE_FORWARD, FIRST_LEADING_BIT, FIRST_TRAILING_BIT, FLOOR,
FRAC, FREXP, INSERT_BITS, LDEXP, LENGTH, LOG,
LOG2, MAX, MIN, MIX, MODF, NORMALIZE, POW, QUANTIZE_TO_F16, RADIANS, REFLECT,
REFRACT, REVERSE_BITS, ROUND, SATURATE, SIGN, SIN, SINH, SMOOTHSTEP, SQRT,
STEP, TAN, TANH, TRANSPOSE, TRUNC, UNPACK2X16_FLOAT, UNPACK2X16_SNORM,
UNPACK2X16_UNORM, UNPACK4X8_SNORM, UNPACK4X8_UNORM, UNPACK4X_I8, UNPACK4X_U8,
PACK2X16_FLOAT, PACK2X16_SNORM,
PACK2X16_UNORM, PACK4X8_SNORM, PACK4X8_UNORM, PACK4X_I8, PACK4X_U8,
WORKGROUP_BARRIER,
// Access modes
READ, WRITE, READ_WRITE,
// Address spaces
PRIVATE, WORKGROUP, UNIFORM, STORAGE,
// Builtin values
VERTEX_INDEX, INSTANCE_INDEX, POSITION, FRONT_FACING, FRAG_DEPTH,
LOCAL_INVOCATION_ID, LOCAL_INVOCATION_INDEX, GLOBAL_INVOCATION_ID,
WORKGROUP_ID, NUM_WORKGROUPS, SAMPLE_INDEX, SAMPLE_MASK,
// Attributes
ALIAS, ALIGN, BINDING, BUILTIN, COMPUTE, CONST, DIAGNOSTIC, FRAGMENT,
GROUP, ID, INTERPOLATE, INVARIANT, LOCATION, MUST_USE, _SIZE,
VERTEX, WORKGROUP_SIZE,
// Texture formats
R32UINT, R32SINT, R32FLOAT,
RGBA8UNORM, RGBA8SNORM, RGBA8UINT, BGRA8UNORM,
RGBA8SINT, RG32UINT, RG32SINT, RG32FLOAT, RGBA16UINT,
RGBA16SINT, RGBA16FLOAT, RGBA32UINT, RGBA32SINT, RGBA32FLOAT,
// Texture methods
TEXTURE_STORE, TEXTURE_LOAD, TEXTURE_SIZE, TEXTURE_DIMENSIONS, TEXTURE_NUM_LAYERS,
TEXTURE_NUM_LEVELS, TEXTURE_NUM_SAMPLES, TEXTURE_SAMPLE, TEXTURE_SAMPLE_BIAS,
TEXTURE_SAMPLE_COMPARE, TEXTURE_SAMPLE_COMPARE_LEVEL, TEXTURE_SAMPLE_GRAD, TEXTURE_SAMPLE_LEVEL,
TEXTURE_GATHER, TEXTURE_GATHER_COMPARE, TEXTURE_GATHER_BIAS, TEXTURE_GATHER_BIAS_COMPARE,
TEXTURE_GATHER_COMPARE_LEVEL, TEXTURE_GATHER_LEVEL,
// Derivative functions
DPDX, DPDY, FWIDTH, DPDX_COARSE, DPDY_COARSE, FWIDTH_COARSE,
DPDX_FINE, DPDY_FINE, FWIDTH_FINE,
// Special identifiers that shouldn't be renamed
MAIN, DERIVATIVE_UNIFORMITY, READONLY_AND_READWRITE_STORAGE_TEXTURES, OLD_VALUE, OFF
};
uint8_t encode_swizzle(const std::string_view text, bool is_four_component) {
static constexpr uint8_t lookup[26] = {
0xFF, 0x2, 0xFF, 0xFF, 0xFF, 0xFF, 0x1, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x2, 0x3, 0x3, 0x0, 0x1,
0xFF, 0xFF, 0x3, 0x0, 0x1, 0x2
};
uint8_t result = 0;
size_t length = text.length();
if (is_four_component) {
if (length != 4) return 0; // Error: must be exactly 4 components
for (size_t i = 0; i < 4; i++) {
uint8_t val = lookup[text[i] - 'a'];
if (val == 0xFF) return 0;
result |= val << (i * 2);
}
}
else {
if (length == 0 || length > 3) return 0; // Error: must be 1-3 components
// Store length in top 2 bits (1-3)
result = (uint8_t)(length << 6);
// Store components in remaining bits
for (size_t i = 0; i < length; i++) {
uint8_t val = lookup[text[i] - 'a'];
if (val == 0xFF) return 0;
result |= val << (i * 2);
}
}
return result;
}
std::string decode_swizzle(uint8_t encoded, bool is_four_component) {
static constexpr char components[] = "xyzw";
std::string result;
if (is_four_component) {
for (int i = 0; i < 4; i++) {
result += components[(encoded >> (i * 2)) & 0x3];
}
}
else {
// Length is stored in top 2 bits
size_t length = (encoded >> 6) & 0x3;
if (length == 0 || length > 3) return ""; // Invalid length
for (size_t i = 0; i < length; i++) {
result += components[(encoded >> (i * 2)) & 0x3];
}
}
return result;
}
uint32_t data_size = 0;
uint32_t data_size2 = 0;
void AppendVar(uint8_t*& data, uint16_t value) {
// If value fits in 7 bits, use single byte
if (value < 0x80) {
data[0] = value;
data += 1;
data_size += 1;
return;
}
// Otherwise use two bytes, with high bit set on first byte
data[0] = 0x80 | (value & 0x7F); // Low 7 bits, with marker
data[1] = (value >> 7) & 0xFF; // High bits
data += 2;
data_size += 2;
}
uint16_t GetVar(const uint8_t* data, size_t& offset) {
uint8_t first = data[offset];
// Single byte format
if ((first & 0x80) == 0) {
offset += 1;
return first;
}
// Two byte format
uint16_t value = (first & 0x7F) | ((uint16_t)data[offset + 1] << 7);
offset += 2;
return value;
}
void AppendToken(uint8_t*& data, WGSLTokenTypes type) {
AppendVar(data, type);
}
WGSLTokenTypes GetToken(const uint8_t* data, size_t& offset) {
return (WGSLTokenTypes)GetVar(data, offset);
}
void AppendReservedToken(uint8_t*& data, WGSLTokenTypes type) {
AppendToken(data, type);
}
void AppendIdentifierToken(uint8_t*& data, uint16_t var) {
AppendToken(data, WGSLTokenTypes::IDENTIFIER);
AppendVar(data, var);
}
void AppendSwizzleToken(uint8_t*& data, uint8_t swizzle) {
AppendToken(data, WGSLTokenTypes::SWIZZLE);
data[0] = swizzle;
data += 1;
data_size += 1;
}
void AppendShortSwizzleToken(uint8_t*& data, uint8_t swizzle) {
AppendToken(data, WGSLTokenTypes::SHORTSWIZZLE);
data[0] = swizzle;
data += 1;
data_size += 1;
}
template<typename TYPE>
void AppendNumber(uint8_t*& data, TYPE f) {
AppendToken(data, (sizeof(TYPE) == 4) ? NUMBER4 : NUMBER8);
*(TYPE*)data = f;
data += sizeof(TYPE);
data_size += sizeof(TYPE);
}
template<typename TYPE>
void AppendUnsignedNumber(uint8_t*& data, TYPE f) {
AppendToken(data, (sizeof(TYPE) == 4) ? UNSIGNED_NUMBER4 : UNSIGNED_NUMBER8);
*(TYPE*)data = f;
data += sizeof(TYPE);
data_size += sizeof(TYPE);
}
template<typename TYPE>
void AppendFloat(uint8_t*& data, TYPE f) {
AppendToken(data, (sizeof(TYPE) == 4) ? FLOAT4 : FLOAT8);
*(TYPE*)data = f;
data += sizeof(TYPE);
data_size += sizeof(TYPE);
}
void AppendChar(uint8_t*& data, const char c) {
AppendToken(data, WGSLTokenTypes::_CHAR);
*data = c;
data++;
data_size++;
}
void AppendText(WGSLTokenTypes type, uint8_t*& data, const std::string& str) {
AppendToken(data, type);
*data = (uint8_t)str.size();
data += 1;
memcpy(data, str.c_str(), str.size());
data += str.size();
data_size += 1 + (uint32_t)str.size();
}
// Reserved words, a multimap
static std::unordered_map<std::string, WGSLTokenTypes> g_reservedWords;
static std::array<std::string, OFF+1> g_reservedWordsReverse;
void AddReservedWord(const std::string& s, WGSLTokenTypes type) {
g_reservedWords[s] = type;
g_reservedWordsReverse[(uint16_t)type] = s;
}
void InitReservedWords() {
for (auto token : std::initializer_list<std::pair<std::string, WGSLTokenTypes>>{
// Operators
{"(", LEFT_PARAM}, {")", RIGHT_PARAM}, {"[", LEFT_BRACKET}, {"]", RIGHT_BRACKET},
{"<", LEFT_ANGLE}, {">", RIGHT_ANGLE}, {";", SEMICOLON}, {",", COMMA}, {".", PERIOD},
{"=", ASSIGN}, {"-", MINUS}, {"+", PLUS}, {"*", MULTIPLY}, {"/", DIVIDE}, {"!", NOT},
{"||", OR}, {"&&", AND}, {"^", XOR}, {"~", TILDE}, {"%", MODULO}, {"?", QUESTION},
{":", COLON}, {"@", AT}, {"#", HASH}, {"$", DOLLAR}, {"!", BANG}, {"|", PIPE},
{"&", AMPERSAND}, {"^", CARET}, {"%", PERCENT}, {"{", LEFT_CURLY}, {"}", RIGHT_CURLY},
// Additional
{"NULL", NULLUC},
{"self", SELF},
{"abstract", ABSTRACT},
{"active", ACTIVE},
{"alignas", ALIGNAS},
{"alignof", ALIGNOF},
{"as", AS},
{"asm", ASM},
{"asm_fragment", ASM_FRAGMENT},
{"async", ASYNC},
{"attribute", ATTRIBUTE},
{"auto", AUTO},
{"await", AWAIT},
{"become", BECOME},
{"binding_array", BINDING_ARRAY},
{"cast", CAST},
{"catch", CATCH},
{"class", CLASS},
{"co_await", CO_AWAIT},
{"co_return", CO_RETURN},
{"co_yield", CO_YIELD},
{"coherent", COHERENT},
{"column_major", COLUMN_MAJOR},
{"common", COMMON},
{"compile", COMPILE},
{"compile_fragment", COMPILE_FRAGMENT},
{"concept", CONCEPT},
{"const_cast", CONST_CAST},
{"consteval", CONSTEVAL},
{"constexpr", CONSTEXPR},
{"constinit", CONSTINIT},
{"crate", CRATE},
{"debugger", DEBUGGER},
{"decltype", DECLTYPE},
{"delete", DELETE},
{"demote", DEMOTE},
{"demote_to_helper", DEMOTE_TO_HELPER},
{"do", DO},
{"dynamic_cast", DYNAMIC_CAST},
{"enum", ENUM},
{"explicit", EXPLICIT},
{"export", EXPORT},
{"extends", EXTENDS},
{"external", EXTERNAL},
{"filter", FILTER},
{"final", FINAL},
{"finally", FINALLY},
{"friend", FRIEND},
{"from", FROM},
{"fxgroup", FXGROUP},
{"get", GET},
{"goto", GOTO},
{"groupshared", GROUPSHARED},
{"high", HIGH},
{"implements", IMPLEMENTS},
{"import", IMPORT},
{"inline", INLINE},
{"instanceof", INSTANCEOF},
{"interface", INTERFACE},
{"layout", LAYOUT},
{"low", LOW},
{"macro", MACRO},
{"match", MATCH},
{"medium", MEDIUM},
{"module", MODULE},
{"mutable", MUTABLE},
{"namespace", NAMESPACE},
{"nodiscard", NODISCARD},
{"noexcept", NOEXCEPT},
{"noinline", NOINLINE},
{"nointerpolation", NOINTERPOLATION},
{"non_coherent", NON_COHERENT},
{"noncoherent", NONCOHERENT},
{"noperspective", NOPERSPECTIVE},
{"nulllc", NULLLC},
{"nullptr", NULLPTR},
{"of", OF},
{"operator", _OPERATOR},
{"package", PACKAGE},
{"packoffset", PACKOFFSET},
{"partition", PARTITION},
{"pass", PASS},
{"patch", PATCH},
{"pixelfragment", PIXELFRAGMENT},
{"precise", PRECISE},
{"precision", PRECISION},
{"premerge", PREMERGE},
{"priv", PRIV},
{"protected", PROTECTED},
{"pub", PUB},
{"public", PUBLIC},
{"readonly", READONLY},
{"ref", REF},
{"regardless", REGARDLESS},
{"register", REGISTER},
{"reinterpret_cast", REINTERPRET_CAST},
{"require", REQUIRE},
{"resource", RESOURCE},
{"restrict", RESTRICT},
{"set", SET},
{"shared", SHARED},
{"sizeof", SIZEOF},
{"smooth", SMOOTH},
{"snorm", SNORM},
{"static", STATIC},
{"static_cast", STATIC_CAST},
{"std", STD},
{"subroutine", SUBROUTINE},
{"super", SUPER},
{"target", TARGET},
{"template", TEMPLATE},
{"this", THIS},
{"thread_local", THREAD_LOCAL},
{"throw", THROW},
{"trait", TRAIT},
{"try", TRY},
{"typedef", TYPEDEF},
{"typeid", TYPEID},
{"typename", TYPENAME},
{"typeof", TYPEOF},
{"union", UNION},
{"unless", UNLESS},
{"unorm", UNORM},
{"unsafe", UNSAFE},
{"unsized", UNSIZED},
{"use", USE},
{"using", USING},
{"varying", VARYING},
{"virtual", VIRTUAL},
{"volatile", VOLATILE},
{"wgsl", WGSL},
{"where", WHERE},
{"with", WITH},
{"writeonly", WRITEONLY},
{"yield", YIELD},
{"linear", LINEAR},
{"flat", FLAT},
{"perspective", PERSPECTIVE},
// Types
{"bool", _BOOL},
{"f32", F32},
{"f16", F16},
{"i32", I32},
{"u32", _U32},
{"array", ARRAY},
{"atomic", ATOMIC},
// Matrix Types
{"mat2x2f", MAT2X2F},
{"mat2x3f", MAT2X3F},
{"mat2x4f", MAT2X4F},
{"mat3x2f", MAT3X2F},
{"mat3x3f", MAT3X3F},
{"mat3x4f", MAT3X4F},
{"mat4x2f", MAT4X2F},
{"mat4x3f", MAT4X3F},
{"mat4x4f", MAT4X4F},
{"mat2x2h", MAT2X2H},
{"mat2x3h", MAT2X3H},
{"mat2x4h", MAT2X4H},
{"mat3x2h", MAT3X2H},
{"mat3x3h", MAT3X3H},
{"mat3x4h", MAT3X4H},
{"mat4x2h", MAT4X2H},
{"mat4x3h", MAT4X3H},
{"mat4x4h", MAT4X4H},
// Other Types
{"ptr", PTR},
{"sampler", SAMPLER},
{"sampler_comparison", SAMPLER_COMPARISON},
{"texture_1d", TEXTURE_1D},
{"texture_2d", TEXTURE_2D},
{"texture_2d_array", TEXTURE_2D_ARRAY},
{"texture_3d", TEXTURE_3D},
{"texture_cube", TEXTURE_CUBE},
{"texture_cube_array", TEXTURE_CUBE_ARRAY},
{"texture_multisampled_2d", TEXTURE_MULTISAMPLED_2D},
{"texture_storage_1d", TEXTURE_STORAGE_1D},
{"texture_storage_2d", TEXTURE_STORAGE_2D},
{"texture_storage_2d_array", TEXTURE_STORAGE_2D_ARRAY},
{"texture_storage_3d", TEXTURE_STORAGE_3D},
{"texture_depth_2d", TEXTURE_DEPTH_2D},
{"texture_depth_2d_array", TEXTURE_DEPTH_2D_ARRAY},
{"texture_depth_cube", TEXTURE_DEPTH_CUBE},
{"texture_depth_cube_array", TEXTURE_DEPTH_CUBE_ARRAY},
{"texture_depth_multisampled_2d", TEXTURE_DEPTH_MULTISAMPLED_2D},
{"vec2", VEC2},
{"vec3", VEC3},
{"vec4", VEC4},
{"vec2i", VEC2I},
{"vec3i", VEC3I},
{"vec4i", VEC4I},
{"vec2u", VEC2U},
{"vec3u", VEC3U},
{"vec4u", VEC4U},
{"vec2f", VEC2F},
{"vec3f", VEC3F},
{"vec4f", VEC4F},
{"vec2h", VEC2H},
{"vec3h", VEC3H},
{"vec4h", VEC4H},
// Keywords
{"break", BREAK},
{"case", CASE},
{"continue", CONTINUE},
{"continuing", CONTINUING},
{"default", DEFAULT},
{"discard", DISCARD},
{"else", ELSE},
{"enable", ENABLE},
{"fallthrough", FALLTHROUGH},
{"false", FALSE},
{"fn", FN},
{"for", FOR},
{"function", FUNCTION},
{"if", IF},
{"let", LET},
{"loop", LOOP},
{"override", OVERRIDE},
{"return", RETURN},
{"struct", STRUCT},
{"switch", SWITCH},
{"true", TRUE},
{"type", TYPE},
{"var", VAR},
{"while", WHILE},
{"bitcast", BITCAST},
{"and", AND},
{"or", OR},
{"xor", XOR},
{"not", NOT},
{"static_assert", STATIC_ASSERT},
{"diagnostic_control", DIAGNOSTIC_CONTROL},
{"requires", REQUIRES},
// Built-in functions
{"abs", ABS},
{"acos", ACOS},
{"acosh", ACOSH},
{"all", ALL},
{"any", ANY},
{"array_length", ARRAY_LENGTH},
{"asin", ASIN},
{"asinh", ASINH},
{"atan", ATAN},
{"atan2", ATAN2},
{"atanh", ATANH},
{"atomicAdd", ATOMIC_ADD},
{"atomicAnd", ATOMIC_AND},
{"atomicCompareExchangeWeak", ATOMIC_COMPARE_EXCHANGE_WEAK},
{"atomicExchange", ATOMIC_EXCHANGE},
{"atomicLoad", ATOMIC_LOAD},
{"atomicMax", ATOMIC_MAX},
{"atomicMin", ATOMIC_MIN},
{"atomicOr", ATOMIC_OR},
{"atomicStore", ATOMIC_STORE},
{"atomicSub", ATOMIC_SUB},
{"atomicXor", ATOMIC_XOR},
{"ceil", CEIL},
{"clamp", CLAMP},
{"cos", COS},
{"cosh", COSH},
{"countLeadingZeros", COUNT_LEADING_ZEROS},
{"countOneBits", COUNT_ONE_BITS},
{"countTrailingZeros", COUNT_TRAILING_ZEROS},
{"cross", CROSS},
{"degrees", DEGREES},
{"determinant", DETERMINANT},
{"distance", DISTANCE},
{"dot", DOT},
{"exp", EXP},
{"exp2", EXP2},
{"extractBits", EXTRACT_BITS},
{"faceForward", FACE_FORWARD},
{"firstLeadingBit", FIRST_LEADING_BIT},
{"firstTrailingBit", FIRST_TRAILING_BIT},
{"floor", FLOOR},
{"fma", FMA},
{"fract", FRAC},
{"frexp", FREXP},
{"insertBits", INSERT_BITS},
{"inverseSqrt", INVERSE_SQRT},
{"ldexp", LDEXP},
{"length", LENGTH},
{"log", LOG},
{"log2", LOG2},
{"max", MAX},
{"min", MIN},
{"mix", MIX},
{"modf", MODF},
{"normalize", NORMALIZE},
{"pow", POW},
{"quantizeToF16", QUANTIZE_TO_F16},
{"radians", RADIANS},
{"reflect", REFLECT},
{"refract", REFRACT},
{"reverseBits", REVERSE_BITS},
{"round", ROUND},
{"saturate", SATURATE},
{"select", SELECT},
{"sign", SIGN},
{"sin", SIN},
{"sinh", SINH},
{"smoothstep", SMOOTHSTEP},
{"sqrt", SQRT},
{"step", STEP},
{"tan", TAN},
{"tanh", TANH},
{"transpose", TRANSPOSE},
{"trunc", TRUNC},
{"pack2x16float", PACK2X16_FLOAT},
{"pack2x16snorm", PACK2X16_SNORM},
{"pack2x16unorm", PACK2X16_UNORM},
{"pack4x8snorm", PACK4X8_SNORM},
{"pack4x8unorm", PACK4X8_UNORM},
{"pack4xI8", PACK4X_I8},
{"pack4xU8", PACK4X_U8},
{"unpack2x16float", UNPACK2X16_FLOAT},
{"unpack2x16snorm", UNPACK2X16_SNORM},
{"unpack2x16unorm", UNPACK2X16_UNORM},
{"unpack4x8snorm", UNPACK4X8_SNORM},
{"unpack4x8unorm", UNPACK4X8_UNORM},
{"unpack4xI8", UNPACK4X_I8},
{"unpack4xU8", UNPACK4X_U8},
{"workgroupBarrier", WORKGROUP_BARRIER},
// Access modes
{"read", READ},
{"write", WRITE},
{"read_write", READ_WRITE},
// Address spaces
{"private", PRIVATE},
{"workgroup", WORKGROUP},
{"uniform", UNIFORM},
{"storage", STORAGE},
// Builtin values
{"vertex_index", VERTEX_INDEX},
{"instance_index", INSTANCE_INDEX},
{"position", POSITION},
{"front_facing", FRONT_FACING},
{"frag_depth", FRAG_DEPTH},
{"local_invocation_id", LOCAL_INVOCATION_ID},
{"local_invocation_index", LOCAL_INVOCATION_INDEX},
{"global_invocation_id", GLOBAL_INVOCATION_ID},
{"workgroup_id", WORKGROUP_ID},
{"num_workgroups", NUM_WORKGROUPS},
{"sample_index", SAMPLE_INDEX},
{"sample_mask", SAMPLE_MASK},
// Attributes
{"alias", ALIAS},
{"align", ALIGN},
{"binding", BINDING},
{"builtin", BUILTIN},
{"compute", COMPUTE},
{"const", CONST},
{"diagnostic", DIAGNOSTIC},
{"fragment", FRAGMENT},
{"group", GROUP},
{"id", ID},
{"interpolate", INTERPOLATE},
{"invariant", INVARIANT},
{"location", LOCATION},
{"must_use", MUST_USE},
{"size", _SIZE},
{"vertex", VERTEX},
{"workgroup_size", WORKGROUP_SIZE},
// Texture formats
{"r32uint", R32UINT},
{"r32sint", R32SINT},
{"r32float", R32FLOAT},
{"rgba8unorm", RGBA8UNORM},
{"rgba8snorm", RGBA8SNORM},
{"rgba8uint", RGBA8UINT},
{"bgra8unorm", BGRA8UNORM},
{"rgba8sint", RGBA8SINT},
{"rg32uint", RG32UINT},
{"rg32sint", RG32SINT},
{"rg32float", RG32FLOAT},
{"rgba16uint", RGBA16UINT},
{"rgba16sint", RGBA16SINT},
{"rgba16float", RGBA16FLOAT},
{"rgba32uint", RGBA32UINT},
{"rgba32sint", RGBA32SINT},
{"rgba32float", RGBA32FLOAT},
// Texture methods
{"textureStore", TEXTURE_STORE},
{"textureLoad", TEXTURE_LOAD},
{"textureSize", TEXTURE_SIZE},
{"textureDimensions", TEXTURE_DIMENSIONS},
{"textureNumLayers", TEXTURE_NUM_LAYERS},
{"textureNumLevels", TEXTURE_NUM_LEVELS},
{"textureNumSamples", TEXTURE_NUM_SAMPLES},
{"textureSample", TEXTURE_SAMPLE},
{"textureSampleBias", TEXTURE_SAMPLE_BIAS},
{"textureSampleCompare", TEXTURE_SAMPLE_COMPARE},
{"textureSampleCompareLevel", TEXTURE_SAMPLE_COMPARE_LEVEL},
{"textureSampleGrad", TEXTURE_SAMPLE_GRAD},
{"textureSampleLevel", TEXTURE_SAMPLE_LEVEL},
{"textureGather", TEXTURE_GATHER},
{"textureGatherCompare", TEXTURE_GATHER_COMPARE},
{"textureGatherBias", TEXTURE_GATHER_BIAS},
{"textureGatherBiasCompare", TEXTURE_GATHER_BIAS_COMPARE},
{"textureGatherCompareLevel", TEXTURE_GATHER_COMPARE_LEVEL},
{"textureGatherLevel", TEXTURE_GATHER_LEVEL},
// Derivative functions
{"dpdx", DPDX},
{"dpdy", DPDY},
{"fwidth", FWIDTH},
{"dpdxCoarse", DPDX_COARSE},
{"dpdyCoarse", DPDY_COARSE},
{"fwidthCoarse", FWIDTH_COARSE},
{"dpdxFine", DPDX_FINE},
{"dpdyFine", DPDY_FINE},
{"fwidthFine", FWIDTH_FINE},
// Special identifiers that shouldn't be renamed
{"main", MAIN},
{"derivative_uniformity", DERIVATIVE_UNIFORMITY},
{"readonly_and_readwrite_storage_textures", READONLY_AND_READWRITE_STORAGE_TEXTURES},
{"old_value", OLD_VALUE},
{"off", OFF},
}) {
AddReservedWord(token.first, token.second);
}
}
WGSLTokenTypes isReservedWord(const std::string_view s) {
auto it = g_reservedWords.find(s.data());
if (it != g_reservedWords.end()) {
return it->second; // return the mapped token type
}
return (WGSLTokenTypes)-1;
}
std::string getReservedWord(WGSLTokenTypes type) {
return g_reservedWordsReverse[type];
}
// A number literal could be something like: 123, 456u, -78, 3.14f, etc.
bool isNumberLiteral(const std::string_view s) {
// A simple heuristic:
// - Optional leading '-'
// - Then digits
// - Possibly '.' or 'f' or 'u'
// This is a simplified check. wndr-todo: make sure this follows all wgsl rules.
size_t start = 0;
if (!s.empty() && s[0] == '-') {
start = 1;
}
bool hasDigits = false;
for (size_t i = start; i < s.size(); i++) {
char c = s[i];
if (std::isdigit((unsigned char)c)) {
hasDigits = true;
continue;
}
// Allowed chars in a number literal: '.', 'f', 'u'
// If something else appears, break
if (c != '.' && c != 'f' && c != 'u') {
return false;
}
}
return hasDigits;
}
bool isFloatLiteral(const std::string& s) {
// A float literal if it contains '.' or ends with 'f'
// Example: "3.14", "0.5f"
return (s.find('.') != std::string::npos) || (!s.empty() && s.back() == 'f');
}
bool isUnsignedLiteral(const std::string& s) {
// Unsigned literal if it ends with 'u'
// Example: "123u"
return (!s.empty() && s.back() == 'u');
}
float parseFloat(const std::string& s) {
return std::stof(s);
}
uint32_t parseUnsigned(const std::string& s) {
// strip trailing 'u' if present
std::string temp = s;
if (!temp.empty() && temp.back() == 'u')
temp.pop_back();
return (uint32_t)std::stoul(temp);
}
int32_t parseInt(const std::string& s) {
// could handle 'u' or 'f' but we assume isNumberLiteral logic prevents that for pure ints
return std::stoi(s);
}
void Tokenize(uint8_t*& data, uint32_t& size, std::string_view wgsl) {
std::string current;
for (size_t i = 0; i < wgsl.length(); i++) {
char c = wgsl[i];
// Handle identifiers/keywords
if (std::isalpha(c) || c == '_') {
current = c;
while (++i < wgsl.length() && (std::isalnum(wgsl[i]) || wgsl[i] == '_')) {
current += wgsl[i];
}
i--;
WGSLTokenTypes reservedType = isReservedWord(current);
if (reservedType != (WGSLTokenTypes)-1) {
// Reserved token
AppendReservedToken(data, reservedType);
}
else if (isNumberLiteral(current)) {
// Parse as number
if (isFloatLiteral(current)) {
float f = parseFloat(current);
AppendFloat(data, f);
}
else if (isUnsignedLiteral(current)) {
uint32_t u = parseUnsigned(current);
AppendUnsignedNumber(data, u);
}
else {
int32_t val = parseInt(current);
AppendNumber(data, val);
}
}
else {
AppendText(IDENTIFIER, data, current);
}
continue;
}
// Handle numbers
if (std::isdigit(c) || (c == '-' && i + 1 < wgsl.length() && std::isdigit(wgsl[i + 1]))) {
current = c;
while (++i < wgsl.length() && (std::isdigit(wgsl[i]) || wgsl[i] == '.' ||
wgsl[i] == 'f' || wgsl[i] == 'u')) {
current += wgsl[i];
}
i--;
if (isFloatLiteral(current)) {
float f = parseFloat(current);
AppendFloat(data, f);
}
else if (isUnsignedLiteral(current)) {
uint32_t u = parseUnsigned(current);
AppendUnsignedNumber(data, u);
}
else {
int32_t val = parseInt(current);
AppendNumber(data, val);
}
continue;
}
// Handle newlines
if (c == '\n') {
AppendReservedToken(data, NEWLINE);
continue;
}
current = c;
WGSLTokenTypes reservedType = isReservedWord(current);
if (reservedType != (WGSLTokenTypes)-1) {
// Reserved token
AppendReservedToken(data, reservedType);
continue;
}
}
}
static uint8_t ReadU8(const std::vector<uint8_t>& d, size_t& offset) {
uint8_t len;
memcpy(&len, &d[offset], 1);
offset += 1;
return len;
}
// Helper to read a 4-byte number as float or int
static uint32_t ReadU32(const std::vector<uint8_t>& d, size_t& offset) {
uint32_t v;
memcpy(&v, &d[offset], 4);
offset += 4;
return v;
}
// Helper to read an 8-byte number
static uint64_t ReadU64(const std::vector<uint8_t>& d, size_t& offset) {
uint64_t v;
memcpy(&v, &d[offset], 8);
offset += 8;
return v;
}
std::string ToWGSL(const std::vector<uint8_t>& d) {
std::string wgsl;
size_t offset = 0;
int indentLevel = 0;
int prevToken = -1;
auto addIndent = [&]() {
for (int i = 0; i < indentLevel; i++) wgsl += " ";
};
while (offset < d.size()) {
WGSLTokenTypes token = (WGSLTokenTypes)GetToken(d.data(), offset);
std::string text;
// Decide how to read based on token type
if (token == NEWLINE) {
wgsl += "\n";
if (offset < d.size()) addIndent();
prevToken = token;
continue;
}
else if (token == NUMBER4) {
int32_t val = ReadU32(d, offset);
text = std::to_string(val);
}
else if (token == NUMBER8) {
uint64_t val = ReadU64(d, offset);
text = std::to_string(val);
}
else if (token == UNSIGNED_NUMBER4) {
uint32_t val = ReadU32(d, offset);
text = std::to_string(val) + "u";
}
else if (token == UNSIGNED_NUMBER8) {
uint64_t val = ReadU64(d, offset);
text = std::to_string(val) + "u";
}
else if (token == FLOAT4) {
uint32_t val = ReadU32(d, offset);
float db;
memcpy(&db, &val, 4);
text = std::format("{:#g}", db);
if (!text.contains('e'))
while (text.back() == '0') {
text.pop_back();
}
}
else if (token == FLOAT8) {
uint64_t val = ReadU64(d, offset);
double db;
memcpy(&db, &val, 8);
text = std::format("{:#g}", db);
if (!text.contains('e'))
while (text.back() == '0') {
text.pop_back();
}
}
else if (token == IDENTIFIER) {
uint16_t val = GetVar(d.data(), offset);
std::string var = "v" + std::to_string(val);
text += var;
}
else if (token == SWIZZLE) {
uint8_t val = *(d.data() + offset++);
std::string swizzle = decode_swizzle(val, true);
text += swizzle;
}
else if (token == SHORTSWIZZLE) {
uint8_t val = *(d.data() + offset++);
std::string swizzle = decode_swizzle(val, false);
text += swizzle;
}
else if (token == _CHAR) {
uint8_t val = *(d.data() + offset++);
text += val;
}
else {
text = getReservedWord(token);
}
// Spacing logic
WGSLTokenTypes currType = (WGSLTokenTypes)token;
WGSLTokenTypes prevTypeEnum = (prevToken >= 0) ? (WGSLTokenTypes)prevToken : NEWLINE;
wgsl += text;
switch (token) {
case REQUIRES:
case RETURN:
case STRUCT:
case ALIAS:
case CONST:
case CASE:
case VAR:
case LET:
case FN:
wgsl += " ";
break;
default:
// Reserved or unknown token that had no extra data
// Just print whatever text we got from getReservedWord
break;
}
prevToken = token;
}
return wgsl;
}
struct WGSLPreprocessor {
std::string result;
std::unordered_map<std::string, uint16_t> renamedVars;