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module: denote const vs. mut component queries

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
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Stephen Gutekanst 2024-05-06 14:26:30 -07:00 • committed by Stephen Gutekanst
parent 7d033ca2cf
commit 22feb42730
1 changed files with 9 additions and 5 deletions
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14
src/module/entities.zig
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@ -641,9 +641,13 @@ pub fn Entities(comptime modules: anytype) type {
/// Logical AND operator for query expressions /// Logical AND operator for query expressions
op_and: []const @This(), op_and: []const @This(),
/// Match a specific module component. /// Match a specific module component, indicating it will only be read.
// TODO: add component name type and consider replacing StringTable approach with global enum // TODO: add component name type and consider replacing StringTable approach with global enum
component: StringTable.Index, const_component: StringTable.Index,
/// Match a specific module component, indicating it will be mutated.
// TODO: add component name type and consider replacing StringTable approach with global enum
mut_component: StringTable.Index,
pub fn match(q: @This(), archetype: *Archetype) bool { pub fn match(q: @This(), archetype: *Archetype) bool {
switch (q) { switch (q) {
@ -651,7 +655,7 @@ pub fn Entities(comptime modules: anytype) type {
for (qs) |and_q| if (!and_q.match(archetype)) return false; for (qs) |and_q| if (!and_q.match(archetype)) return false;
return true; return true;
}, },
.component => |component_name| { .const_component, .mut_component => |component_name| {
for (archetype.columns) |column| if (column.name == component_name) return true; for (archetype.columns) |column| if (column.name == component_name) return true;
return false; return false;
}, },
@ -933,8 +937,8 @@ test "example" {
// Dynamic queries (e.g. issued from another programming language without comptime) // Dynamic queries (e.g. issued from another programming language without comptime)
var q = try world.queryDynamic(.{ var q = try world.queryDynamic(.{
.op_and = &.{ .op_and = &.{
.{ .component = world.componentName(EntityModule.name, .id) }, .{ .const_component = world.componentName(EntityModule.name, .id) },
.{ .component = world.componentName(Game.name, .rotation) }, .{ .const_component = world.componentName(Game.name, .rotation) },
}, },
}); });
while (q.next()) |archtype| { while (q.next()) |archtype| {