From d77935f788bf19a27a9f3c14d08084a1ee3a9234 Mon Sep 17 00:00:00 2001
From: frosch <frosch@openttd.org>
Date: Thu, 16 Jul 2015 17:05:40 +0000
Subject: (svn r27334) -Revert (r27232) [FS#6342]: No idea what the plan was,
 but making the main noise coefficients the same for all smoothness types
 certainly wasn't.

---
 src/tgp.cpp | 57 +++++++++++----------------------------------------------
 1 file changed, 11 insertions(+), 46 deletions(-)

(limited to 'src')

diff --git a/src/tgp.cpp b/src/tgp.cpp
index 1e736c638..436870b41 100644
--- a/src/tgp.cpp
+++ b/src/tgp.cpp
@@ -248,41 +248,16 @@ static height_t TGPGetMaxHeight()
  */
 static amplitude_t GetAmplitude(int frequency)
 {
-	/* Base noise amplitudes (multiplied by 1024) and indexed by "smoothness setting" and log2(frequency).
-	 * Used for maps that have their smallest side smaller than 512. */
-	static const amplitude_t amplitudes_small[][10] = {
+	/* Base noise amplitudes (multiplied by 1024) and indexed by "smoothness setting" and log2(frequency). */
+	static const amplitude_t amplitudes[][7] = {
 		/* lowest frequency ...... highest (every corner) */
-		{60000, 2273, 4142, 2253, 421, 213, 137, 177, 37,  16}, ///< Very smooth
-		{50000, 2273, 4142, 2253, 421, 213, 137, 177, 37,  61}, ///< Smooth
-		{40000, 2273, 4142, 2253, 421, 213, 137, 177, 37,  91}, ///< Rough
-		{30000, 2273, 4142, 2253, 421, 213, 137, 177, 37, 161}, ///< Very rough
+		{16000,  5600,  1968,   688,   240,    16,    16}, ///< Very smooth
+		{24000, 12800,  6400,  2700,  1024,   128,    16}, ///< Smooth
+		{32000, 19200, 12800,  8000,  3200,   256,    64}, ///< Rough
+		{48000, 24000, 19200, 16000,  8000,   512,   320}, ///< Very rough
 	};
-
-	/* Base noise amplitudes (multiplied by 1024) and indexed by "smoothness setting" and log2(frequency).
-	 * Used for maps that have their smallest side equal to 512. */
-	static const amplitude_t amplitudes_middle[][10] = {
-		{55000, 2273, 5142, 253, 2421, 213, 137, 177, 37,  16}, ///< Very smooth
-		{45000, 2273, 5142, 253, 2421, 213, 137, 177, 37,  61}, ///< Smooth
-		{35000, 2273, 5142, 253, 2421, 213, 137, 177, 37,  91}, ///< Rough
-		{25000, 2273, 5142, 253, 2421, 213, 137, 177, 37, 161}, ///< Very rough
-	};
-
-	/* Base noise amplitudes (multiplied by 1024) and indexed by "smoothness setting" and log2(frequency).
-	 * Used for maps that have their smallest side bigger than 512. */
-	static const amplitude_t amplitudes_large[][10] = {
-		/* lowest frequency ...... highest (every corner) */
-		{55000, 2273, 5142, 253, 421, 2213, 137, 177, 37,  16}, ///< Very smooth
-		{45000, 2273, 5142, 253, 421, 2213, 137, 177, 37,  61}, ///< Smooth
-		{35000, 2273, 5142, 253, 421, 2213, 137, 177, 37,  91}, ///< Rough
-		{25000, 2273, 5142, 253, 421, 2213, 137, 177, 37, 161}, ///< Very rough
-	};
-
-	/* Make sure arrays cover all smoothness settings. */
-	assert_compile(lengthof(amplitudes_small)  == TGEN_SMOOTHNESS_END);
-	assert_compile(lengthof(amplitudes_middle) == TGEN_SMOOTHNESS_END);
-	assert_compile(lengthof(amplitudes_large)  == TGEN_SMOOTHNESS_END);
-
-	/* Extrapolation factors for ranges before the table.
+	/*
+	 * Extrapolation factors for ranges before the table.
 	 * The extrapolation is needed to account for the higher map heights. They need larger
 	 * areas with a particular gradient so that we are able to create maps without too
 	 * many steep slopes up to the wanted height level. It's definitely not perfect since
@@ -294,20 +269,10 @@ static amplitude_t GetAmplitude(int frequency)
 	static const double extrapolation_factors[] = { 3.3, 2.8, 2.3, 1.8 };
 
 	int smoothness = _settings_game.game_creation.tgen_smoothness;
-	int smallest_size = min(_settings_game.game_creation.map_x, _settings_game.game_creation.map_y);
 
-	int index;
-	amplitude_t amplitude;
-	if (smallest_size < 9) { // Smallest map side is less than 2^9 == 512.
-		index = frequency - MAX_TGP_FREQUENCIES + lengthof(amplitudes_small[0]);
-		amplitude = amplitudes_small[smoothness][max(0, index)];
-	} else if (smallest_size == 9) {
-		index = frequency - MAX_TGP_FREQUENCIES + lengthof(amplitudes_middle[0]);
-		amplitude = amplitudes_middle[smoothness][max(0, index)];
-	} else {
-		index = frequency - MAX_TGP_FREQUENCIES + lengthof(amplitudes_large[0]);
-		amplitude = amplitudes_large[smoothness][max(0, index)];
-	}
+	/* Get the table index, and return that value if possible. */
+	int index = frequency - MAX_TGP_FREQUENCIES + lengthof(amplitudes[smoothness]);
+	amplitude_t amplitude = amplitudes[smoothness][max(0, index)];
 	if (index >= 0) return amplitude;
 
 	/* We need to extrapolate the amplitude. */
-- 
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