[PERFORMANCE] Memory allocation reduction

[Jorma Rebane]

Using MTuner data from a short run of the game, we can drastically improve 0 A.D. core engine performance, by reducing the number of allocations in the detected hotspots.

For more information, check the Memory Performance thread on the forums: http://www.wildfiregames.com/forum/index.php?showtopic=17310&st=20#entry270448

Sub-tickets: modeldef.cpp: #2006 parser.cpp: #2005 guimanager.cpp: #2007 textrenderer.cpp: #2027 shaderdefines.cpp: #2029

<progress>, <memblock>, <total memops>, <stacktrace>
(V),		size 4, 	count 61320, 	modeldef.cpp:300
(V),		size 8, 	count 61320, 	modeldef.cpp:301
(V),		size 48,	count 42028, 	parser.cpp:246
(V),		size 36,	count 40866, 	guimanager.cpp:273 & 265
(V),		size 8, 	count 32749, 	modeldef.cpp:241
(V),		size 32,	count 27638, 	textrenderer.cpp:136
(V),		size 8,		count 21952, 	cgui.cpp:986
(V),		size 16,	count 21952, 	textrenderer.cpp:77
(V),		size 16, 	count 21952, 	shaderdefines.cpp:135
(V),		size 48,	count 21952, 	cgui.cpp:954
(V),		size 12,	count 20688, 	modelrenderer.cpp:635
(V),		size 112,	count 17325, 	guirenderer.cpp:388
( ),		size 108,	count 16896,	patchrdata.cpp:173
(V),		size 8,		count 14852, 	shaderdefines.cpp:116
(x),		size 48,	count 14154, 	font.cpp:33
( ),		size 36,	count 13230, 	patchrdata.cpp:1025
(V),		size 48,	count 12008, 	parser.cpp:981
( ),		size 24, 	count 9783, 	patchrdata.cpp:1025
(V),		size 8,		count 9645, 	modelrenderer.cpp:433
(V),		size 8,		count 8935, 	modelrenderer.cpp:698
( ),		size 48,	count 8265, 	cgui.cpp:916
(V),		size 48,	count 8144, 	parser.cpp:933
( ),		size 93,	count 7806, 	guitext.cpp:266
( ),		size 132, 	count 7806, 	cgui.cpp:689
( ),		size 132,	count 7806, 	cgui.cpp:800 & 855
(V),		size 12,	count 7072, 	modelrenderer.cpp:636
(V),		,		,		textrenderer.cpp:77
(V),		,		,		textrenderer.cpp:179
( ),		,		,		patchrdata.cpp:1052
( ),		,		,		guitext.cpp:210
( ),		,		,		terraintextureentry.h:75
( ),		,		,		patchrdata.cpp:192
( ),		,		,		cgui.cpp:675
( ),		,		,		texturemanager.cpp:150
( ),		,		,		texturemanager.cpp:153
( ),		,		,		texturemanager.cpp:511
( ),		,		,		texturemanager.h:136
(V),		,		,		parser.cpp:639
( ),		,		,		componentmanager.cpp:620

[Jorma Rebane]

CModelDef fixes uploaded. This patch addresses two problems: 1) CModelDef loading performance

In order to make loading faster, had to change the format of cached binary model data. The new model cache files take a tiny bit more disk space, but in return they load several times faster and the loaded data takes less memory.

2) Complex dynamic objects in structs

One of the main perf hitters was a per-vertex (yes, per each vertex!) std::vector<float> for multiple UV's. This was replaced with 2x CVector2D UV0 & UV1. Another one was an std::string for model prop points, which was replaced with a fixed size buffer m_Name[20] and with an additional m_NameLength.

The result: much better memory performance and usage for model loading.

In order for this to work, I had to change the version of the PMD (binary model cache) format to 4 and change the way models are saved to PMD. This may invalidate any existing model cache. Backwards compatibility for versions 1, 2, 3 is there.

[Jorma Rebane]

CParser fix finished. Check ticket: #2005

[Jorma Rebane]

Updated: CTextRenderer patch added.

[Jorma Rebane]

CTextRenderer patch also fixes cgui.cpp:986

[Jorma Rebane]

Added ShaderDefines fix. Check ticket #2029