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Engine: implemented GameLoopUntilState
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This state runs while the game is in waiting loop, replaces RestrictUntil struct.
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@ivan-mogilko
ivan-mogilko committed Feb 6, 2024
1 parent a7e8752 commit 5aa8aef
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Showing 2 changed files with 115 additions and 90 deletions.
4 changes: 4 additions & 0 deletions Engine/ac/runtime_defines.h
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Original file line number Diff line number Diff line change
Expand Up @@ -114,6 +114,10 @@ const int LegacyRoomVolumeFactor = 30;
// Overlay parameters
#define OVR_AUTOPLACE 30000

// These are possibly actions scheduled to run after "wait";
// but only FOR_EXITLOOP is used currently;
// other FOR_* types are deprecated since at least v2.5.
// Judging by the old comment in code, FOR_SCRIPT is for v2.1 and earlier.
#define FOR_ANIMATION 1
#define FOR_SCRIPT 2
#define FOR_EXITLOOP 3
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201 changes: 111 additions & 90 deletions Engine/main/game_run.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -99,6 +99,7 @@ float fps = std::numeric_limits<float>::quiet_NaN();
static auto t1 = AGS_Clock::now(); // timer for FPS // ... 't1'... how very appropriate.. :)
unsigned int loopcounter=0;
static unsigned int lastcounter=0;
static size_t numEventsAtStartOfFunction; // CHECKME: research and document this

#define UNTIL_ANIMEND 1
#define UNTIL_MOVEEND 2
Expand All @@ -110,20 +111,94 @@ static unsigned int lastcounter=0;
#define UNTIL_INTISNEG 8
#define UNTIL_ANIMBTNEND 9

// Following struct instructs the engine to run game loops until
static void GameTick();

// Game state instructs the engine to run game loops until
// certain condition is not fullfilled.
struct RestrictUntil
class GameLoopUntilState : public GameState
{
int type = 0; // type of condition, UNTIL_* constant
int disabled_for = 0; // FOR_* constant
public:
GameLoopUntilState(int untilwhat, const void* data_ptr = nullptr, int data1 = 0, int data2 = 0)
: _untilType(untilwhat)
, _disabledFor(FOR_EXITLOOP)
, _dataPtr(data_ptr)
, _data1(data1)
, _data2(data2)
{
}

int GetUntilType() const { return _untilType; }
int GetDisabledFor() const { return _disabledFor; }
const void *GetDataPtr() const { return _dataPtr; }
int GetData1() const { return _data1; }
int GetData2() const { return _data2; }

// Begin the state, initialize and prepare any resources
void Begin() override
{
assert(_disabledFor == FOR_EXITLOOP);
play.disabled_user_interface++;
// If GUI looks change when disabled, then mark all of them for redraw
GUI::MarkAllGUIForUpdate(GUI::Options.DisabledStyle != kGuiDis_Unchanged, true);

// Only change the mouse cursor if it hasn't been specifically changed first
// (or if it's speech, always change it)
if (((cur_cursor == cur_mode) || (_untilType == UNTIL_NOOVERLAY)) &&
(cur_mode != CURS_WAIT))
{
set_mouse_cursor(CURS_WAIT);
}
}
// End the state, release all resources
void End() override
{
set_our_eip(77);
set_default_cursor();
// If GUI looks change when disabled, then mark all of them for redraw
GUI::MarkAllGUIForUpdate(GUI::Options.DisabledStyle != kGuiDis_Unchanged, true);
play.disabled_user_interface--;

switch (_disabledFor)
{
case FOR_EXITLOOP:
break;
// These other types are obsolete since at least v2.5
// FOR_SCRIPT is for v2.1 and earlier.
// case FOR_ANIMATION:
// run_animation((FullAnimation*)user_disabled_data2,user_disabled_data3);
// break;
// case FOR_SCRIPT:
// break;
default:
quit("Unknown reason to disable user input in the Wait state.");
break;
}
}
// Draw the state
void Draw() override
{
}
// Update the state during a game tick
bool Run() override
{
GameTick();
return ShouldStayInWaitMode();
}

private:
int _untilType = 0; // type of condition, UNTIL_* constant
int _disabledFor = 0; // FOR_* constant
// pointer to the test variable
const void *data_ptr = nullptr;
const void *_dataPtr = nullptr;
// other values used for a test, depend on type
int data1 = 0;
int data2 = 0;
} restrict_until;
int _data1 = 0;
int _data2 = 0;
};

// TODO: this is a global variable, because this state is checked during update;
// find a way to refactor this and not have it here.
std::unique_ptr<GameLoopUntilState> restrict_until;

static size_t numEventsAtStartOfFunction;

static void ProperExit()
{
Expand Down Expand Up @@ -201,7 +276,7 @@ static int game_loop_check_ground_level_interactions()
// if in a Wait loop which is no longer valid (probably
// because the Region interaction did a NewRoom), abort
// the rest of the loop
if ((restrict_until.type > 0) && (!ShouldStayInWaitMode())) {
if ((restrict_until) && (!ShouldStayInWaitMode())) {
// cancel the Rep Exec and Stands on Hotspot events that
// we just added -- otherwise the event queue gets huge
events.resize(numEventsAtStartOfFunction);
Expand Down Expand Up @@ -454,7 +529,7 @@ bool run_service_key_controls(KeyInput &out_key)
}

if (((agskey == eAGSKeyCodeCtrlV) && (ki.Mod & eAGSModAlt) != 0)
&& (play.wait_counter < 1) && (play.text_overlay_on == 0) && (restrict_until.type == 0)) {
&& (play.wait_counter < 1) && (play.text_overlay_on == 0) && (!restrict_until)) {
// make sure we can't interrupt a Wait()
// and desync the music to cutscene
play.debug_mode++;
Expand Down Expand Up @@ -1004,30 +1079,33 @@ static void UpdateMouseOverLocation()
}

// Checks if user interface should remain disabled for now
// FIXME: should be a private method of GameLoopUntilState,
// but is called elsewhere for some strange reason;
// investigate and move to GameLoopUntilState.
static bool ShouldStayInWaitMode() {
if (restrict_until.type == 0)
if (!restrict_until)
quit("end_wait_loop called but game not in loop_until state");

switch (restrict_until.type)
switch (restrict_until->GetUntilType())
{
case UNTIL_MOVEEND:
{
short*wkptr = (short*)restrict_until.data_ptr;
short*wkptr = (short*)restrict_until->GetDataPtr();
return !(wkptr[0] < 1);
}
case UNTIL_CHARIS0:
{
char*chptr = (char*)restrict_until.data_ptr;
char*chptr = (char*)restrict_until->GetDataPtr();
return !(chptr[0] == 0);
}
case UNTIL_NEGATIVE:
{
short*wkptr = (short*)restrict_until.data_ptr;
short*wkptr = (short*)restrict_until->GetDataPtr();
return !(wkptr[0] < 0);
}
case UNTIL_INTISNEG:
{
int*wkptr = (int*)restrict_until.data_ptr;
int*wkptr = (int*)restrict_until->GetDataPtr();
return !(wkptr[0] < 0);
}
case UNTIL_NOOVERLAY:
Expand All @@ -1036,17 +1114,17 @@ static bool ShouldStayInWaitMode() {
}
case UNTIL_INTIS0:
{
int*wkptr = (int*)restrict_until.data_ptr;
int*wkptr = (int*)restrict_until->GetDataPtr();
return !(wkptr[0] == 0);
}
case UNTIL_SHORTIS0:
{
short*wkptr = (short*)restrict_until.data_ptr;
short*wkptr = (short*)restrict_until->GetDataPtr();
return !(wkptr[0] == 0);
}
case UNTIL_ANIMBTNEND:
{ // still animating?
return FindButtonAnimation(restrict_until.data1, restrict_until.data2) >= 0;
return FindButtonAnimation(restrict_until->GetData1(), restrict_until->GetData2()) >= 0;
}
default:
quit("loop_until: unknown until event");
Expand All @@ -1055,92 +1133,35 @@ static bool ShouldStayInWaitMode() {
return true; // should stay in wait
}

static int UpdateWaitMode()
{
if (restrict_until.type == 0) { return RETURN_CONTINUE; }

if (!ShouldStayInWaitMode())
restrict_until.type = 0;
set_our_eip(77);

if (restrict_until.type > 0) { return RETURN_CONTINUE; }

auto was_disabled_for = restrict_until.disabled_for;

set_default_cursor();
// If GUI looks change when disabled, then mark all of them for redraw
GUI::MarkAllGUIForUpdate(GUI::Options.DisabledStyle != kGuiDis_Unchanged, true);
play.disabled_user_interface--;
restrict_until.disabled_for = 0;

switch (was_disabled_for) {
// case FOR_ANIMATION:
// run_animation((FullAnimation*)user_disabled_data2,user_disabled_data3);
// break;
case FOR_EXITLOOP:
return -1;
case FOR_SCRIPT:
quit("err: for_script obsolete (v2.1 and earlier only)");
break;
default:
quit("Unknown user_disabled_for in end restrict_until");
}

// we shouldn't get here.
return RETURN_CONTINUE;
}

// Run single game iteration; calls UpdateGameOnce() internally
static int GameTick()
static void GameTick()
{
if (displayed_room < 0)
quit("!A blocking function was called before the first room has been loaded");

UpdateGameOnce(true);
UpdateMouseOverLocation();

set_our_eip(76);

int res = UpdateWaitMode();
if (res == RETURN_CONTINUE) { return 0; } // continue looping
return res;
}

static void SetupLoopParameters(int untilwhat, const void* data_ptr = nullptr, int data1 = 0, int data2 = 0) {
play.disabled_user_interface++;
// If GUI looks change when disabled, then mark all of them for redraw
GUI::MarkAllGUIForUpdate(GUI::Options.DisabledStyle != kGuiDis_Unchanged, true);

// Only change the mouse cursor if it hasn't been specifically changed first
// (or if it's speech, always change it)
if (((cur_cursor == cur_mode) || (untilwhat == UNTIL_NOOVERLAY)) &&
(cur_mode != CURS_WAIT))
set_mouse_cursor(CURS_WAIT);

restrict_until.type = untilwhat;
restrict_until.data_ptr = data_ptr;
restrict_until.data1 = data1;
restrict_until.data2 = data2;
restrict_until.disabled_for = FOR_EXITLOOP;
}

// This function is called from lot of various functions
// in the game core, character, room object etc
static void GameLoopUntilEvent(int untilwhat, const void* data_ptr = nullptr, int data1 = 0, int data2 = 0) {
// blocking cutscene - end skipping
EndSkippingUntilCharStops();
// blocking cutscene - end skipping
EndSkippingUntilCharStops();

// this function can get called in a nested context, so
// remember the state of these vars in case a higher level
// call needs them
auto cached_restrict_until = restrict_until;
// this function can get called in a nested context, so
// remember the state of these vars in case a higher level
// call needs them
std::unique_ptr<GameLoopUntilState> cached_restrict_until = std::move(restrict_until);

SetupLoopParameters(untilwhat, data_ptr, data1, data2);
while (GameTick()==0);
restrict_until.reset(new GameLoopUntilState(untilwhat, data_ptr, data1, data2));
restrict_until->Begin();
while (restrict_until->Run());
restrict_until->End();

set_our_eip(78);
set_our_eip(78);

restrict_until = cached_restrict_until;
restrict_until = std::move(cached_restrict_until);
}

void GameLoopUntilValueIsZero(const char *value)
Expand Down

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