1 files changed, 94 insertions, 0 deletions
diff --git a/src/input.c b/src/input.c
new file mode 100644
index 0000000..6b02ad7
--- /dev/null
+++ b/src/input.c
@@ -0,0 +1,94 @@
+#include <string.h>
+#include <engine/input.h>
+#include <engine/logging.h>
+
+
+bool binding_action_cmp(binding_t *restrict a, binding_t *restrict b) {
+	InputType t = a->action.type;
+	if (t != b->action.type) return false;
+	switch (t) {
+		case InputType_action:
+			return !strcmp(a->action.action.callback_str, b->action.action.callback_str);
+
+		case InputType_state:
+			return (!strcmp(a->action.state.activate_str,   b->action.state.activate_str))
+			    && (!strcmp(a->action.state.deactivate_str, b->action.state.deactivate_str));
+
+		case InputType_range: // fallthrough
+		default:
+			return false; // not implemented
+	}
+	return false;
+}
+
+bool binding_scancode_cmp(binding_t *restrict a, binding_t *restrict b) {
+	return a->scancode == b->scancode
+	    || a->scancode_alt == b->scancode_alt;
+}
+
+bool binding_scancode_cmp_i(binding_t *restrict a, scancode_t scancode) {
+	return a->scancode == scancode
+	    || a->scancode_alt == scancode;
+}
+
+// If any binding in ctx contains action, replace that entry.
+bool i_update_binding(i_ctx *ctx, binding_t* binding) {
+	isize idx = 0;
+	if (ctx == NULL || binding == NULL) {
+		ERROR("i_update_binding received nullptr!");
+		return false;
+	}
+
+	while (idx < ctx->len && !binding_action_cmp(&ctx->bindings[idx], binding)) idx++;
+
+	if (idx < ctx->len && binding_action_cmp(&ctx->bindings[idx], binding)) {
+		ctx->bindings[idx].scancode = binding->scancode;
+		ctx->bindings[idx].scancode_alt = binding->scancode_alt;
+		return true;
+	}
+
+	return false;
+}
+
+// If any binding in ctx contains scancode, replace that action.
+bool i_update_unique_binding(i_ctx *ctx, binding_t* binding) {
+	isize idx = 0;
+	if (ctx == NULL || binding == NULL) {
+		ERROR("i_update_unique_binding received nullptr!");
+		return false;
+	}
+
+	while (idx < ctx->len && !binding_scancode_cmp(&ctx->bindings[idx], binding)) idx++;
+
+	if (idx < ctx->len && binding_scancode_cmp(&ctx->bindings[idx], binding)) {
+		ctx->bindings[idx].action = binding->action;
+		return true;
+	}
+
+	return false;
+}
+
+void i_flush_bindings(usize numcalls, void* state_mem, input_callback_t* c[]) {
+	for (usize i = 0; i < numcalls; i++) {
+		(c[i])(state_mem);
+	}
+}
+
+action_t i_get_action(const i_ctx *ctx, u32 time, scancode_t scancode) {
+	isize idx = 0;
+
+	if (ctx == NULL) {
+		ERROR("%s received nullptr!", __func__);
+		return (action_t){.type = InputType_error};
+	}
+
+	while (idx < ctx->len && !binding_scancode_cmp_i(&ctx->bindings[idx], scancode)) idx++;
+
+	if (idx < ctx->len
+		  && binding_scancode_cmp_i(&ctx->bindings[idx], scancode)) {
+		ctx->bindings[idx].since_last_activation = time;
+		return ctx->bindings[idx].action;
+	}
+
+	return (action_t){.type = InputType_error};
+}