46 lines
742 B
Odin
46 lines
742 B
Odin
package main
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import "core:slice"
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StateVariant :: union{^Game, ^Menu}
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GameState :: struct {
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update: proc(state: ^GameState, delta: f32),
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draw: proc(state: ^GameState),
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variant: StateVariant
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}
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new_state :: proc($T: typeid) -> ^T {
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state := new(T)
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state.variant = state
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return state
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}
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STACK_SIZE :: 16
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state_buf : [STACK_SIZE]^GameState
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state_stack : [dynamic]^GameState
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stack_init :: proc() {
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state_stack = slice.into_dynamic(state_buf[:])
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}
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stack_push :: proc(state: ^GameState) -> (bool) {
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if len(state_stack) == STACK_SIZE {
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return false
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}
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append(&state_stack, state)
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return true
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}
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stack_pop :: proc() -> (bool) {
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if len(state_stack) == 0 {
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return false
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}
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state := pop(&state_stack)
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free(state)
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return true
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}
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