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777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 | 109x 109x 109x 109x 109x 109x 109x 109x 109x 109x 1691x 428x 428x 428x 169x 20x 149x 18x 131x 4x 127x 2x 125x 1x 124x 2x 122x 3x 119x 2x 117x 3x 114x 2x 112x 2x 110x 16x 94x 15x 79x 2x 77x 3x 74x 69x 5x 1x 4x 1x 3x 1x 2x 1x 1x 1x 259x 1263x 12x 12x 12x 9x 2x 7x 1x 6x 1x 5x 1x 4x 2x 2x 2x 3x 1251x 18x 1233x 23x 1210x 109x 71x 71x 71x 71x 109x 84x 84x 226x 86x 86x 140x 50x 90x 10x 80x 71x 71x 13x 13x 13x 58x 58x 58x 58x 9x 9x 2x 2x 2x 2x 7x 1x 1x 1x 1x 6x 1x 1x 1x 5x 2x 2x 2x 3x 1x 1x 1x 2x 1x 1x 1x 1x 1x 1x 1x 1x 84x 84x 109x 72x 72x 72x 69x 3x 109x 29x 29x 29x 9x 29x 9x 29x 2x 29x 2x 109x 30x 30x 93x 93x 93x 21x 72x 2x 70x 35x 35x 35x 3x 9x 109x 30x 5x 25x 25x 1x 1x 24x 3x 21x 109x 1x 1x 2x 1x 109x 49x 49x 85x 85x 85x 49x 135x 2x 133x 63x 63x 9x 70x 10x 20x 60x 38x 38x 22x 1x 49x 49x 109x 80x 109x 17x 53x 10x 43x 2x 2x 2x 2x 41x 109x 1x 2x 1x 1x 1x 109x 372x 109x 372x 16x 1x 1x 1x 1x 1x 1x 1x 1x 1x 15x 15x 15x 15x 15x 15x 15x 10x 5x 5x 15x 15x 15x 356x 80x 80x 80x 80x 80x 276x 4x 272x 272x 2x 270x 270x 270x 4x 4x 4x 266x 372x 109x 128x 15x 30x 28x 28x 2x 2x 15x 15x 15x 109x 1x 109x 90x 109x 109x 1x 109x 16x 109x 17x 109x 16x 109x 109x 372x 372x 372x 1121x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1120x 11x 11x 11x 1120x 1120x 372x | import { wrap8Bit } from "shared/lib/helpers/8bit";
import { assertUnreachable } from "./format";
import tokenize from "shared/lib/rpn/tokenizer";
import shuntingYard from "shared/lib/rpn/shuntingYard";
import {
PrecompiledValueRPNOperation,
PrecompiledValueFetch,
isValueOperation,
ScriptValue,
isUnaryOperation,
ValueOperatorType,
ValueUnaryOperatorType,
isValueUnaryOperatorType,
isScriptValueVariable,
ScriptValueAtom,
OptimisedScriptValue,
} from "./types";
import { OperatorSymbol, RPNToken } from "shared/lib/rpn/types";
import { subpxShiftForUnits } from "shared/lib/helpers/subpixels";
import { normalizeVariableId } from "shared/lib/variables/variableIds";
const boolToInt = (val: boolean) => (val ? 1 : 0);
const zero = {
type: "number",
value: 0,
} as const;
export const optimiseScriptValue = (
input: ScriptValue,
): OptimisedScriptValue => {
if (isValueOperation(input)) {
const optimisedA = input.valueA ? optimiseScriptValue(input.valueA) : zero;
const optimisedB = input.valueB ? optimiseScriptValue(input.valueB) : zero;
if (optimisedA?.type === "number" && optimisedB?.type === "number") {
// Can perform constant folding as both inputs are numbers
if (input.type === "add") {
return {
type: "number",
value: Math.floor(optimisedA.value + optimisedB.value),
};
} else if (input.type === "sub") {
return {
type: "number",
value: Math.floor(optimisedA.value - optimisedB.value),
};
} else if (input.type === "mul") {
return {
type: "number",
value: Math.floor(optimisedA.value * optimisedB.value),
};
} else if (input.type === "div") {
return {
type: "number",
value: Math.floor(optimisedA.value / optimisedB.value),
};
} else if (input.type === "mod") {
return {
type: "number",
value: Math.floor(optimisedA.value % optimisedB.value),
};
} else if (input.type === "gt") {
return {
type: "number",
value: boolToInt(optimisedA.value > optimisedB.value),
};
} else if (input.type === "gte") {
return {
type: "number",
value: boolToInt(optimisedA.value >= optimisedB.value),
};
} else if (input.type === "lt") {
return {
type: "number",
value: boolToInt(optimisedA.value < optimisedB.value),
};
} else if (input.type === "lte") {
return {
type: "number",
value: boolToInt(optimisedA.value <= optimisedB.value),
};
} else if (input.type === "eq") {
return {
type: "number",
value: boolToInt(optimisedA.value === optimisedB.value),
};
} else if (input.type === "ne") {
return {
type: "number",
value: boolToInt(optimisedA.value !== optimisedB.value),
};
} else if (input.type === "min") {
return {
type: "number",
value: Math.min(optimisedA.value, optimisedB.value),
};
} else if (input.type === "max") {
return {
type: "number",
value: Math.max(optimisedA.value, optimisedB.value),
};
} else if (input.type === "and") {
return {
type: "number",
value: optimisedA.value && optimisedB.value,
};
} else if (input.type === "or") {
return {
type: "number",
value: optimisedA.value || optimisedB.value,
};
} else if (input.type === "shl") {
return {
type: "number",
value: optimisedA.value << optimisedB.value,
};
} else if (input.type === "shr") {
return {
type: "number",
value: optimisedA.value >> optimisedB.value,
};
} else if (input.type === "bAND") {
return {
type: "number",
value: optimisedA.value & optimisedB.value,
};
} else if (input.type === "bOR") {
return {
type: "number",
value: optimisedA.value | optimisedB.value,
};
} else if (input.type === "bXOR") {
return {
type: "number",
value: optimisedA.value ^ optimisedB.value,
};
} else Eif (input.type === "atan2") {
return {
type: "number",
value: Math.floor(
wrap8Bit(
Math.atan2(optimisedA.value, optimisedB.value) * (128 / Math.PI) +
64,
),
),
};
}
/* istanbul ignore next: unreachable */
assertUnreachable(input.type);
}
return {
...input,
valueA: optimisedA,
valueB: optimisedB,
};
}
if (isUnaryOperation(input)) {
const type = input.type;
const optimisedValue = input.value
? optimiseScriptValue(input.value)
: zero;
if (optimisedValue?.type === "number") {
if (type === "not") {
return {
type: "number",
value: boolToInt(!optimisedValue.value),
};
} else if (type === "abs") {
return {
type: "number",
value: Math.floor(Math.abs(optimisedValue.value)),
};
} else if (type === "isqrt") {
return {
type: "number",
value: Math.floor(Math.sqrt(optimisedValue.value)),
};
} else if (type === "bNOT") {
return {
type: "number",
value: ~optimisedValue.value,
};
} else if (type === "rnd") {
return {
type: "rnd",
value: {
type: "number",
value: optimisedValue.value,
},
};
} else Eif (type === "neg") {
return {
type: "number",
value: Math.floor(-optimisedValue.value),
};
}
/* istanbul ignore next: unreachable */
assertUnreachable(type);
}
return {
...input,
value: optimisedValue,
};
} else if (input.type === "expression") {
return optimiseScriptValue(expressionToScriptValue(input.value));
} else if (input.type === "variable" && input.index) {
return {
...input,
index: optimiseScriptValue(input.index),
};
}
return input;
};
const mapOperator = (
operator: OperatorSymbol,
): ValueOperatorType | ValueUnaryOperatorType => {
const operatorMap: Record<
OperatorSymbol,
ValueOperatorType | ValueUnaryOperatorType
> = {
"/": "div",
"*": "mul",
"+": "add",
"-": "sub",
"%": "mod",
"!": "not",
"&": "bAND",
"|": "bOR",
"^": "bXOR",
"~": "bNOT",
"==": "eq",
"!=": "ne",
"<": "lt",
"<=": "lte",
">": "gt",
">=": "gte",
"&&": "and",
"||": "or",
"<<": "shl",
">>": "shr",
neg: "neg",
};
const scriptValueOperator = operatorMap[operator];
/* istanbul ignore else: unreachable else branch */
if (scriptValueOperator) {
return scriptValueOperator;
} else {
assertUnreachable(scriptValueOperator);
return "eq";
}
};
export const rpnTokensToScriptValue = (rpnTokens: RPNToken[]): ScriptValue => {
const stack: ScriptValue[] = [];
for (const operation of rpnTokens) {
if (operation.type === "VAR") {
const variableId = normalizeVariableId(
operation.symbol.replace(/\$/g, ""),
);
stack.push({
type: "variable",
value: variableId,
...(operation.index && {
index: rpnTokensToScriptValue(operation.index),
}),
});
} else if (operation.type === "VAL") {
stack.push({
type: "number",
value: operation.value,
});
} else if (operation.type === "CONST") {
stack.push({
type: "constant",
value: operation.symbol,
});
} else if (operation.type === "OP") {
const scriptValueOperator = mapOperator(operation.operator);
if (isValueUnaryOperatorType(scriptValueOperator)) {
const value = stack.pop();
Eif (value) {
stack.push({
type: scriptValueOperator,
value,
});
}
} else {
const valueB = stack.pop();
const valueA = stack.pop();
Eif (valueA && valueB) {
stack.push({
type: scriptValueOperator,
valueA,
valueB,
});
}
}
} else if (operation.type === "FUN") {
if (operation.function === "min") {
const valueB = stack.pop();
const valueA = stack.pop();
Eif (valueA && valueB) {
stack.push({
type: "min",
valueA,
valueB,
});
}
} else if (operation.function === "max") {
const valueB = stack.pop();
const valueA = stack.pop();
Eif (valueA && valueB) {
stack.push({
type: "max",
valueA,
valueB,
});
}
} else if (operation.function === "abs") {
const value = stack.pop();
Eif (value) {
stack.push({
type: "abs",
value,
});
}
} else if (operation.function === "len") {
const value = stack.pop();
if (isScriptValueVariable(value) && value.index === undefined) {
stack.push({
type: "len",
value: {
type: "variable",
value: value.value,
},
});
} else E{
throw new Error("len() requires an array variable");
}
} else if (operation.function === "rnd") {
const value = stack.pop();
Eif (value) {
stack.push({
type: "rnd",
value,
});
}
} else if (operation.function === "isqrt") {
const value = stack.pop();
Eif (value) {
stack.push({
type: "isqrt",
value,
});
}
} else if (operation.function === "atan2") {
const valueB = stack.pop();
const valueA = stack.pop();
Eif (valueA && valueB) {
stack.push({
type: "atan2",
valueA,
valueB,
});
}
} else Eif (operation.function === "neg") {
const value = stack.pop();
if (value) {
stack.push({
type: "sub",
valueA: { type: "number", value: 0 },
valueB: value,
});
}
} else {
/* istanbul ignore next: unreachable */
assertUnreachable(operation.function);
}
} else E{
/* istanbul ignore next: unreachable */
assertUnreachable(operation);
}
}
Iif (stack.length !== 1) {
throw new Error("Invalid RPN expression");
}
return stack[0];
};
export const expressionToScriptValue = (expression: string): ScriptValue => {
try {
const tokens = tokenize(expression);
const rpnTokens = shuntingYard(tokens);
return rpnTokensToScriptValue(rpnTokens);
} catch {
return zero;
}
};
export const walkScriptValue = (
input: ScriptValue,
fn: (val: ScriptValue) => void,
): void => {
fn(input);
Iif (input.type === "variable" && input.index) {
walkScriptValue(input.index, fn);
}
if ("valueA" in input && input.valueA) {
walkScriptValue(input.valueA, fn);
}
if ("valueB" in input && input.valueB) {
walkScriptValue(input.valueB, fn);
}
if (input.type === "len") {
walkScriptValue(input.value, fn);
}
if ("value" in input && input.value && isUnaryOperation(input)) {
walkScriptValue(input.value, fn);
}
};
// recursively search script value for matching node, stop iterating on first match
export const someInScriptValue = (
input: ScriptValue,
fn: (val: ScriptValue) => boolean,
): boolean => {
const stack: ScriptValue[] = [input];
while (stack.length > 0) {
const currentNode = stack.pop();
Iif (!currentNode) continue;
if (fn(currentNode)) {
return true;
}
if (currentNode.type === "variable" && currentNode.index) {
stack.push(currentNode.index);
} else if ("valueA" in currentNode && "valueB" in currentNode) {
stack.push(currentNode.valueB, currentNode.valueA);
} else Iif (currentNode.type === "len") {
stack.push(currentNode.value);
} else if ("value" in currentNode && isUnaryOperation(currentNode)) {
stack.push(currentNode.value);
}
}
return false;
};
export const mapScriptValue = (
input: ScriptValue,
fn: (val: ScriptValueAtom) => ScriptValueAtom,
): ScriptValue => {
if (isValueOperation(input)) {
return {
...input,
valueA: mapScriptValue(input.valueA, fn),
valueB: mapScriptValue(input.valueB, fn),
};
}
Iif (isUnaryOperation(input)) {
return {
...input,
value: mapScriptValue(input.value, fn),
};
}
if (input.type === "len") {
const value = fn(input.value);
return value.type === "variable" && !("index" in value)
? {
type: "len",
value,
}
: value;
}
if (input.type === "variable" && input.index) {
return fn({
...input,
index: mapScriptValue(input.index, fn),
});
}
return fn(input);
};
export const extractScriptValueActorIds = (input: ScriptValue): string[] => {
const actorIds: string[] = [];
walkScriptValue(input, (val) => {
Iif (val.type === "property" && !actorIds.includes(val.target)) {
actorIds.push(val.target);
}
});
return actorIds;
};
export type ScriptValueVariableUse = {
id: string;
type: "number" | "array";
};
export const extractScriptValueVariableUses = (
input: ScriptValue,
): ScriptValueVariableUse[] => {
const uses: ScriptValueVariableUse[] = [];
const addUse = (id: string, type: ScriptValueVariableUse["type"]) => {
const existingUse = uses.find((use) => use.id === id);
Iif (existingUse) {
if (type === "array") {
existingUse.type = "array";
}
return;
}
uses.push({ id, type });
};
const visit = (value: ScriptValue) => {
if (value.type === "len") {
addUse(value.value.value, "array");
} else if (value.type === "variable") {
addUse(value.value, value.index ? "array" : "number");
if (value.index) {
visit(value.index);
}
} else if (value.type === "expression") {
for (const variable of extractScriptValueVariables(
expressionToScriptValue(value.value),
)) {
addUse(variable, "number");
}
} else if (isValueOperation(value)) {
visit(value.valueA);
visit(value.valueB);
} else if (isUnaryOperation(value)) {
visit(value.value);
}
};
visit(input);
return uses;
};
export const extractScriptValueVariables = (input: ScriptValue): string[] =>
extractScriptValueVariableUses(input).map((use) => use.id);
// recursively search script value for node containing variable, stop iterating on first match
export const variableInScriptValue = (
variable: string,
input: ScriptValue,
): boolean => {
return someInScriptValue(input, (val) => {
if (val.type === "variable" && val.value === variable) {
return true;
} else if (val.type === "expression") {
const text = val.value;
Eif (text && typeof text === "string") {
const expressionValue = expressionToScriptValue(text);
return variableInScriptValue(variable, expressionValue);
}
}
return false;
});
};
export const constantInScriptValue = (
constantId: string,
input: ScriptValue,
): boolean => {
return someInScriptValue(input, (val) => {
if (val.type === "constant" && val.value === constantId) {
return true;
} else Iif (val.type === "expression") {
const text = val.value;
if (text && typeof text === "string") {
const expressionValue = expressionToScriptValue(text);
return constantInScriptValue(constantId, expressionValue);
}
}
return false;
});
};
export const precompileScriptValue = (
input: ScriptValue,
localsLabel = "",
rpnOperations: PrecompiledValueRPNOperation[] = [],
fetchOperations: PrecompiledValueFetch[] = [],
): [PrecompiledValueRPNOperation[], PrecompiledValueFetch[]] => {
return precompileOptimisedScriptValue(
optimiseScriptValue(input),
localsLabel,
rpnOperations,
fetchOperations,
);
};
export const precompileOptimisedScriptValue = (
input: OptimisedScriptValue,
localsLabel = "",
rpnOperations: PrecompiledValueRPNOperation[] = [],
fetchOperations: PrecompiledValueFetch[] = [],
): [PrecompiledValueRPNOperation[], PrecompiledValueFetch[]] => {
if (input.type === "property") {
if (input.target === "camera") {
const positionPropertiesX = ["xpos", "pxpos", "spxpos"];
const positionPropertiesY = ["ypos", "pypos", "spypos"];
const positionProperties = [
...positionPropertiesX,
...positionPropertiesY,
];
if (positionProperties.includes(input.property)) {
if (positionPropertiesX.includes(input.property)) {
rpnOperations.push({
type: "memI16",
value: "camera_x",
});
} else Eif (positionPropertiesY.includes(input.property)) {
rpnOperations.push({
type: "memI16",
value: "camera_y",
});
}
if (input.property === "xpos" || input.property === "ypos") {
rpnOperations.push({
type: "number",
value: subpxShiftForUnits("tiles"),
});
rpnOperations.push({
type: "shr",
});
} else Eif (input.property === "pxpos" || input.property === "pypos") {
rpnOperations.push({
type: "number",
value: subpxShiftForUnits("pixels"),
});
rpnOperations.push({
type: "shr",
});
}
} else Eif (input.property === "xdeadzone") {
rpnOperations.push({
type: "memI8",
value: "camera_deadzone_x",
});
} else if (input.property === "ydeadzone") {
rpnOperations.push({
type: "memI8",
value: "camera_deadzone_y",
});
} else if (input.property === "xoffset") {
rpnOperations.push({
type: "memI8",
value: "camera_offset_x",
});
} else if (input.property === "yoffset") {
rpnOperations.push({
type: "memI8",
value: "camera_offset_y",
});
} else if (input.property === "xscroll") {
rpnOperations.push({
type: "memI16",
value: "scroll_x",
});
} else if (input.property === "yscroll") {
rpnOperations.push({
type: "memI16",
value: "scroll_y",
});
} else {
throw new Error(`Unsupported property type "${input.property}"`);
}
} else {
const localName = `local_${localsLabel}${fetchOperations.length}`;
const positionPropertiesX = ["xpos", "pxpos", "spxpos"];
const positionPropertiesY = ["ypos", "pypos", "spypos"];
const positionProperties = [
...positionPropertiesX,
...positionPropertiesY,
];
if (positionProperties.includes(input.property)) {
fetchOperations.push({
local: localName,
value: {
type: "actorPosition",
target: input.target,
},
});
if (positionPropertiesX.includes(input.property)) {
rpnOperations.push({
type: "local",
value: localName,
offset: 1,
});
} else Eif (positionPropertiesY.includes(input.property)) {
rpnOperations.push({
type: "local",
value: localName,
offset: 2,
});
}
if (input.property === "xpos" || input.property === "ypos") {
rpnOperations.push({
type: "number",
value: subpxShiftForUnits("tiles"),
});
rpnOperations.push({
type: "shr",
});
} else Eif (input.property === "pxpos" || input.property === "pypos") {
rpnOperations.push({
type: "number",
value: subpxShiftForUnits("pixels"),
});
rpnOperations.push({
type: "shr",
});
}
} else Eif (input.property === "direction") {
fetchOperations.push({
local: localName,
value: {
type: "actorDirection",
target: input.target,
},
});
rpnOperations.push({
type: "local",
value: localName,
});
} else if (input.property === "frame") {
fetchOperations.push({
local: localName,
value: {
type: "actorFrame",
target: input.target,
},
});
rpnOperations.push({
type: "local",
value: localName,
offset: 1,
});
} else {
throw new Error(`Unsupported property type "${input.property}"`);
}
}
} else if (isValueOperation(input)) {
Eif (input.valueA) {
precompileScriptValue(
input.valueA,
localsLabel,
rpnOperations,
fetchOperations,
);
}
Eif (input.valueB) {
precompileScriptValue(
input.valueB,
localsLabel,
rpnOperations,
fetchOperations,
);
}
rpnOperations.push({
type: input.type,
});
} else if (input.type === "len") {
rpnOperations.push({
type: "len",
value: input.value.value,
});
} else Iif (isUnaryOperation(input)) {
if (input.value) {
precompileScriptValue(
input.value,
localsLabel,
rpnOperations,
fetchOperations,
);
}
rpnOperations.push({
type: input.type,
});
} else if (input.type === "true") {
rpnOperations.push({ type: "number", value: 1 });
} else Iif (input.type === "false") {
rpnOperations.push({ type: "number", value: 0 });
} else Iif (input.type === "numberSymbol") {
rpnOperations.push({ type: "numberSymbol", value: input.value });
} else if (input.type === "engineField") {
const localName = `local_${localsLabel}${fetchOperations.length}`;
fetchOperations.push({
local: localName,
value: {
type: "engineField",
value: input.value,
},
});
rpnOperations.push({
type: "local",
value: localName,
});
} else {
rpnOperations.push(input);
}
return [peepholeRPN(rpnOperations), fetchOperations];
};
export const sortFetchOperations = (
input: PrecompiledValueFetch[],
): PrecompiledValueFetch[] => {
return [...input].sort((a, b) => {
const toKey = (value: PrecompiledValueFetch): string => {
if ("target" in value.value) {
const symbol =
typeof value.value.target === "string"
? value.value.target
: value.value.target.symbol;
return `${symbol}::${value.value.type}`;
} else Eif (value.value.type === "engineField") {
return `engineField::${value.value.value}`;
}
assertUnreachable(value.value);
return "";
};
const aKey = toKey(a);
const bKey = toKey(b);
return aKey.localeCompare(bKey);
});
};
export const multiplyScriptValueConst = (
value: ScriptValue,
num: number,
): ScriptValue => {
return {
type: "mul",
valueA: value,
valueB: {
type: "number",
value: num,
},
};
};
export const shiftLeftScriptValueConst = (
value: ScriptValue,
num: number,
): ScriptValue => {
return {
type: "shl",
valueA: value,
valueB: {
type: "number",
value: num,
},
};
};
export const shiftRightScriptValueConst = (
value: ScriptValue,
num: number,
): ScriptValue => {
return {
type: "shr",
valueA: value,
valueB: {
type: "number",
value: num,
},
};
};
export const addScriptValueConst = (
value: ScriptValue,
num: number,
): ScriptValue => {
return {
type: "add",
valueA: value,
valueB: {
type: "number",
value: num,
},
};
};
export const subScriptValueConst = (
value: ScriptValue,
num: number,
): ScriptValue => {
return {
type: "sub",
valueA: value,
valueB: {
type: "number",
value: num,
},
};
};
export const addScriptValueToScriptValue = (
valueA: ScriptValue,
valueB: ScriptValue,
): ScriptValue => {
return {
type: "add",
valueA: valueA,
valueB: valueB,
};
};
export const clampScriptValueConst = (
value: ScriptValue,
min: number,
max: number,
): ScriptValue => {
return {
type: "max",
valueA: {
type: "number",
value: min,
},
valueB: {
type: "min",
valueA: {
type: "number",
value: max,
},
valueB: value,
},
};
};
export const maskScriptValueConst = (
value: ScriptValue,
mask: number,
): ScriptValue => {
return {
type: "bAND",
valueA: value,
valueB: {
type: "number",
value: mask,
},
};
};
export const peepholeRPN = (
rpn: PrecompiledValueRPNOperation[],
): PrecompiledValueRPNOperation[] => {
const optimised: PrecompiledValueRPNOperation[] = [];
let i = 0;
while (i < rpn.length) {
// Match SHR X + Add/Sub Y + SHL X
// commonly used in calculations involving adding tiles/pixels values to subpixel variables
if (
i + 5 < rpn.length &&
rpn[i].type === "number" &&
rpn[i + 1].type === "shr" &&
rpn[i + 2].type === "number" &&
(rpn[i + 3].type === "add" || rpn[i + 3].type === "sub") &&
rpn[i + 4].type === "number" &&
rpn[i + 5].type === "shl"
) {
const shrAmount = (rpn[i] as { value: number }).value;
const addAmount = (rpn[i + 2] as { value: number }).value;
const op = rpn[i + 3];
const shlAmount = (rpn[i + 4] as { value: number }).value;
Eif (shrAmount === shlAmount) {
const combined = addAmount << shlAmount;
const mask = ~((1 << shlAmount) - 1) & 0xffff;
optimised.push({ type: "number", value: combined });
optimised.push(op);
optimised.push({ type: "number", value: mask });
optimised.push({ type: "bAND" });
i += 6;
continue;
}
}
// SHR N followed by SHL N = noop
if (
i + 3 < rpn.length &&
rpn[i].type === "number" &&
rpn[i + 1].type === "shr" &&
rpn[i + 2].type === "number" &&
rpn[i + 3].type === "shl"
) {
const shrAmount = (rpn[i] as { value: number }).value;
const shlAmount = (rpn[i + 2] as { value: number }).value;
Iif (shrAmount === shlAmount) {
i += 4;
continue;
}
}
optimised.push(rpn[i]);
i++;
}
return optimised;
};
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