(svn r6532) - Feature: Add support for NewGRF sound effects. Currently sound priority isn't supported.

newgrf_sound.c

@@ -0,0 +1,73 @@
+/* $Id$ */
+
+#include "stdafx.h"
+#include "openttd.h"
+#include "pool.h"
+#include "sound.h"
+#include "engine.h"
+#include "vehicle.h"
+#include "newgrf_callbacks.h"
+#include "newgrf_engine.h"
+#include "newgrf_sound.h"
+
+enum {
+	SOUND_POOL_BLOCK_SIZE_BITS = 3, /* (1 << 3) == 8 items */
+	SOUND_POOL_MAX_BLOCKS      = 1000,
+};
+
+static uint _sound_count = 0;
+static MemoryPool _sound_pool = { "Sound", SOUND_POOL_MAX_BLOCKS, SOUND_POOL_BLOCK_SIZE_BITS, sizeof(FileEntry), NULL, NULL, 0, 0, NULL };
+
+
+/* Allocate a new FileEntry */
+FileEntry *AllocateFileEntry(void)
+{
+	if (_sound_count == _sound_pool.total_items) {
+		if (!AddBlockToPool(&_sound_pool)) return NULL;
+	}
+
+	return (FileEntry*)GetItemFromPool(&_sound_pool, _sound_count++);
+}
+
+
+void InitializeSoundPool(void)
+{
+	CleanPool(&_sound_pool);
+	_sound_count = 0;
+
+	/* Copy original sound data to the pool */
+	SndCopyToPool();
+}
+
+
+FileEntry *GetSound(uint index)
+{
+	if (index >= _sound_count) return NULL;
+	return (FileEntry*)GetItemFromPool(&_sound_pool, index);
+}
+
+
+uint GetNumSounds(void)
+{
+	return _sound_count;
+}
+
+
+bool PlayVehicleSound(const Vehicle *v, VehicleSoundEvent event)
+{
+	const GRFFile *file = GetEngineGRF(v->engine_type);
+	uint16 callback;
+
+	/* If the engine has no GRF ID associated it can't ever play any new sounds */
+	if (file == NULL) return false;
+
+	/* Check that the vehicle type uses the sound effect callback */
+	if (!HASBIT(EngInfo(v->engine_type)->callbackmask, CBM_SOUND_EFFECT)) return false;
+
+	callback = GetVehicleCallback(CBID_VEHICLE_SOUND_EFFECT, event, 0, v->engine_type, v);
+	if (callback == CALLBACK_FAILED) return false;
+	if (callback >= GetNumOriginalSounds()) callback += file->sound_offset - GetNumOriginalSounds();
+
+	SndPlayVehicleFx(callback, v);
+	return true;
+}