Enforce specific play area regardless of screen resolution (diasurgic…

…al#10)

* Enforce play within restricted screen area

* Change radius to 15

Source/cursor.cpp

@@ -242,6 +242,8 @@ bool TrySelectItem(bool flipflag, int mx, int my)
 
 bool TrySelectPixelBased(Point tile)
 {
+	if (!IsScreenPosLegalPlayArea(MousePosition.x, MousePosition.y) && leveltype != DTYPE_TOWN)
+		return false;
 	if (demo::IsRunning() || demo::IsRecording() || HeadlessMode) {
 		// Recorded demos can run headless, but headless mode doesn't support loading sprites that are needed for pixel perfect selection
 		// => Ensure demos are always compatible
@@ -627,6 +629,25 @@ void CheckRportal()
 	}
 }
 
+bool IsScreenPosLegalPlayArea(int x, int y)
+{
+	int panelHeight = 128;
+	Point centerScreen { GetScreenWidth() / 2, (GetScreenHeight() - panelHeight) / 2 };
+	int screenHeight = 600;
+	int screenWidth = screenHeight * 16 / 9;
+	Point boundingBox { screenWidth, screenHeight };
+	boundingBox.y -= panelHeight;
+
+	// Calculate the bounds of the original game resolution centered on the screen
+	int leftBound = centerScreen.x - (boundingBox.x / 2);
+	int rightBound = centerScreen.x + (boundingBox.x / 2);
+	int topBound = centerScreen.y - (boundingBox.y / 2);
+	int bottomBound = centerScreen.y + (boundingBox.y / 2);
+
+	// Check if the cursor is outside the bounding box
+	return !(x < leftBound || x > rightBound || y < topBound || y > bottomBound);
+}
+
 void CheckCursMove()
 {
 	if (IsItemLabelHighlighted())
@@ -795,6 +816,8 @@ void CheckCursMove()
 		return;
 
 	if (leveltype != DTYPE_TOWN) {
+		if (!IsScreenPosLegalPlayArea(MousePosition.x, MousePosition.y))
+			return;
 		// Never select a monster if a target-player-only spell is selected
 		if (IsNoneOf(pcurs, CURSOR_HEALOTHER, CURSOR_RESURRECT)) {
 			if (pcurstemp != -1 && TrySelectMonster(flipflag, currentTile, [](const Monster &monster) {

Source/cursor.h

@@ -59,6 +59,7 @@ void NewCursor(int cursId);
 void InitLevelCursor();
 void CheckRportal();
 void CheckTown();
+bool IsScreenPosLegalPlayArea(int x, int y);
 void CheckCursMove();
 
 void DrawSoftwareCursor(const Surface &out, Point position, int cursId);

Source/diablo.cpp

@@ -2606,6 +2606,9 @@ int DiabloMain(int argc, char **argv)
 
 bool TryIconCurs()
 {
+	if (!IsScreenPosLegalPlayArea(MousePosition.x, MousePosition.y))
+		return false;
+
 	if (pcurs == CURSOR_RESURRECT) {
 		if (PlayerUnderCursor != nullptr) {
 			NetSendCmdParam1(true, CMD_RESURRECT, PlayerUnderCursor->getId());

Source/engine/render/scrollrt.cpp

@@ -570,6 +570,69 @@ void DrawCell(const Surface &out, Point tilePosition, Point targetBufferPosition
 	}
 }
 
+int DetermineRotationCount(int dx, int dy)
+{
+	if (dx > 0 && dy >= 0) return 0; // +x, +y and +x axis
+	if (dx <= 0 && dy > 0) return 1; // -x, +y and +y axis
+	if (dx < 0 && dy <= 0) return 2; // -x, -y and -x axis
+	if (dx >= 0 && dy < 0) return 3; // +x, -y and -y axis
+	return 0;
+}
+
+void ApplyRotationAdjustment(DisplacementOf<int8_t> &offset, int rotationCount)
+{
+	for (int i = 0; i < rotationCount; i++) {
+		// Apply rotation adjustment logic similar to RotateRadius
+		int temp = offset.deltaX;
+		offset.deltaX = offset.deltaY;
+		offset.deltaY = 7 - temp;
+	}
+}
+
+uint8_t CalculateDimming(Point tilePosition)
+{
+	Point playerLightPosition = Lights[MyPlayer->lightId].position.tile;
+	DisplacementOf<int8_t> playerLightOffset = Lights[MyPlayer->lightId].position.offset;
+	int radius = 15; // Should allow full effect from +Light Radius items, but harshly dims the edges. No noticeable change in vanilla settings.
+	int originalLight = dLight[tilePosition.x][tilePosition.y];
+
+	// Adjust player's light offset based on movement
+	if (playerLightOffset.deltaX < 0) {
+		playerLightOffset.deltaX += 8;
+		playerLightPosition.x -= 1;
+	}
+	if (playerLightOffset.deltaY < 0) {
+		playerLightOffset.deltaY += 8;
+		playerLightPosition.y -= 1;
+	}
+
+	// Calculate the delta between the tile position and the player's light position
+	int dx = tilePosition.x - playerLightPosition.x;
+	int dy = tilePosition.y - playerLightPosition.y;
+
+	// Determine how many times to rotate based on dx and dy
+	int rotationCount = DetermineRotationCount(dx, dy);
+
+	// Apply the rotation adjustment to playerLightOffset
+	ApplyRotationAdjustment(playerLightOffset, rotationCount);
+
+	// Ensure deltas are within the bounds of the LightConeInterpolations2 array
+	dx = std::clamp(dx, -31, 31);
+	dy = std::clamp(dy, -31, 31);
+
+	// Use the absolute values to find the linear distance in the interpolation array
+	int linearDistance = LightConeInterpolations2[std::abs(playerLightOffset.deltaX)][std::abs(playerLightOffset.deltaY)][std::abs(dx)][std::abs(dy)];
+
+	// Ensure linearDistance is within the bounds of the LightFalloffs2 array
+	linearDistance = std::min(linearDistance, 255);
+
+	// Determine the dimming level using LightFalloffs2
+	uint8_t dimmingLevel = LightFalloffs2[radius][linearDistance];
+
+	// Apply dimming to the original light level of the tile
+	return std::clamp(static_cast<int>(originalLight) + dimmingLevel, 0, 15);
+}
+
 /**
  * @brief Render a floor tile.
  * @param out Target buffer
@@ -578,7 +641,7 @@ void DrawCell(const Surface &out, Point tilePosition, Point targetBufferPosition
  */
 void DrawFloor(const Surface &out, Point tilePosition, Point targetBufferPosition)
 {
-	LightTableIndex = dLight[tilePosition.x][tilePosition.y];
+	LightTableIndex = CalculateDimming(tilePosition);
 
 	const uint8_t *tbl = LightTables[LightTableIndex].data();
 #ifdef _DEBUG
@@ -704,7 +767,7 @@ void DrawPlayerHelper(const Surface &out, const Player &player, Point tilePositi
 void DrawDungeon(const Surface &out, Point tilePosition, Point targetBufferPosition)
 {
 	assert(InDungeonBounds(tilePosition));
-	LightTableIndex = dLight[tilePosition.x][tilePosition.y];
+	LightTableIndex = CalculateDimming(tilePosition);
 
 	DrawCell(out, tilePosition, targetBufferPosition);
 

Source/lighting.cpp

@@ -31,6 +31,9 @@ std::array<uint8_t, 256> PauseTable;
 bool DisableLighting;
 #endif
 bool UpdateLighting;
+constexpr size_t NumLightRadiuses2 = 32;
+uint8_t LightFalloffs2[NumLightRadiuses2][128 * 2] = {};
+uint8_t LightConeInterpolations2[8][8][32][32] = {};
 
 namespace {
 
@@ -318,6 +321,47 @@ void DoVision(Point position, uint8_t radius, MapExplorationType doAutomap, bool
 	}
 }
 
+void MakeCustomLightTable()
+{
+	const float maxDarkness = 15;
+	const float maxBrightness = 0;
+	for (unsigned radius = 0; radius < NumLightRadiuses2; radius++) {
+		const unsigned maxDistance = (radius + 1) * 8; // Compute the maximum effective distance for this radius
+
+		// Define the threshold for starting the falloff (75% of the way)
+		const unsigned falloffStartDistance = static_cast<unsigned>(maxDistance * 0.50);
+
+		for (unsigned distance = 0; distance < 256; distance++) {
+			if (distance > maxDistance) {
+				// Beyond the effective range of the light, set to maximum darkness
+				LightFalloffs2[radius][distance] = static_cast<uint8_t>(maxDarkness);
+			} else if (distance <= falloffStartDistance) {
+				// Within the 75% range where there's no falloff
+				LightFalloffs2[radius][distance] = static_cast<uint8_t>(maxBrightness);
+			} else {
+				// Calculate a smoother falloff for the last 25%
+				float factor = static_cast<float>(distance - falloffStartDistance) / (static_cast<float>(maxDistance) - static_cast<float>(falloffStartDistance));
+				// Directly scale the darkness based on distance
+				float scaled = maxDarkness * factor;
+				LightFalloffs2[radius][distance] = static_cast<uint8_t>(std::round(scaled));
+			}
+		}
+	}
+
+	// Generate the light cone interpolations
+	for (int offsetY = 0; offsetY < 8; offsetY++) {
+		for (int offsetX = 0; offsetX < 8; offsetX++) {
+			for (int y = 0; y < 32; y++) {
+				for (int x = 0; x < 32; x++) {
+					int a = (8 * x - offsetY);
+					int b = (8 * y - offsetX);
+					LightConeInterpolations2[offsetX][offsetY][x][y] = static_cast<uint8_t>(sqrt(a * a + b * b));
+				}
+			}
+		}
+	}
+}
+
 void MakeLightTable()
 {
 	// Generate 16 gradually darker translation tables for doing lighting
@@ -408,6 +452,7 @@ void MakeLightTable()
 			}
 		}
 	}
+	MakeCustomLightTable();
 }
 
 #ifdef _DEBUG

Source/lighting.h

@@ -56,6 +56,8 @@ extern std::array<uint8_t, 256> PauseTable;
 extern bool DisableLighting;
 #endif
 extern bool UpdateLighting;
+extern uint8_t LightFalloffs2[32][128 * 2];
+extern uint8_t LightConeInterpolations2[8][8][32][32];
 
 void DoUnLight(Point position, uint8_t radius);
 void DoLighting(Point position, uint8_t radius, DisplacementOf<int8_t> offset);

Source/player.cpp

@@ -3121,6 +3121,11 @@ void CheckPlrSpell(bool isShiftHeld, SpellID spellID, SpellType spellType)
 	assert(MyPlayer != nullptr);
 	Player &myPlayer = *MyPlayer;
 
+	if (GetSpellData(spellID).isTargeted()) {
+		if (!IsScreenPosLegalPlayArea(MousePosition.x, MousePosition.y))
+			return;
+	}
+
 	if (!IsValidSpell(spellID)) {
 		myPlayer.Say(HeroSpeech::IDontHaveASpellReady);
 		return;