fixed typo in configure.ac; fixed point perspective()
This commit is contained in:
Tomas Frydrych
parent
120a489067
commit
d1d746eab1
5 changed files with 252 additions and 5 deletions
15
ChangeLog
15
ChangeLog
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@ -1,3 +1,18 @@
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2007-03-29 Tomas Frydrych <tf@openedhand.com>
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* configure.ac: fixed typo
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* clutter/clutter-fixed.c:
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* clutter/clutter-fixed.h:
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(clutter_tani): fast implementation of tan()
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(clutter_qmulx): improved-precission fixed point multiply
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* clutter/clutter-state.c:
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(perspectivex): fixed point implementaiton of perspective()
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(_clutter_stage_sync_viewport):
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(clutter_stage_get_actor_at_pos):
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use perspectivex() instead of perspective()
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2007-03-27 Matthew Allum <mallum@openedhand.com>
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* clutter/cogl/Makefile.am:
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@ -256,6 +256,124 @@ clutter_sini (ClutterAngle angle)
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return result;
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}
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/* pre-computed tan table for 1st quadrant
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*
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* Currently contains 257 entries.
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*
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*/
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static ClutterFixed tan_tbl [] =
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{
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0x00000000L, 0x00000192L, 0x00000324L, 0x000004b7L,
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0x00000649L, 0x000007dbL, 0x0000096eL, 0x00000b01L,
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0x00000c94L, 0x00000e27L, 0x00000fbaL, 0x0000114eL,
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0x000012e2L, 0x00001477L, 0x0000160cL, 0x000017a1L,
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0x00001937L, 0x00001acdL, 0x00001c64L, 0x00001dfbL,
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0x00001f93L, 0x0000212cL, 0x000022c5L, 0x0000245fL,
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0x000025f9L, 0x00002795L, 0x00002931L, 0x00002aceL,
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0x00002c6cL, 0x00002e0aL, 0x00002faaL, 0x0000314aL,
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0x000032ecL, 0x0000348eL, 0x00003632L, 0x000037d7L,
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0x0000397dL, 0x00003b24L, 0x00003cccL, 0x00003e75L,
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0x00004020L, 0x000041ccL, 0x00004379L, 0x00004528L,
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0x000046d8L, 0x0000488aL, 0x00004a3dL, 0x00004bf2L,
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0x00004da8L, 0x00004f60L, 0x0000511aL, 0x000052d5L,
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0x00005492L, 0x00005651L, 0x00005812L, 0x000059d5L,
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0x00005b99L, 0x00005d60L, 0x00005f28L, 0x000060f3L,
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0x000062c0L, 0x0000648fL, 0x00006660L, 0x00006834L,
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0x00006a0aL, 0x00006be2L, 0x00006dbdL, 0x00006f9aL,
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0x0000717aL, 0x0000735dL, 0x00007542L, 0x0000772aL,
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0x00007914L, 0x00007b02L, 0x00007cf2L, 0x00007ee6L,
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0x000080dcL, 0x000082d6L, 0x000084d2L, 0x000086d2L,
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0x000088d6L, 0x00008adcL, 0x00008ce7L, 0x00008ef4L,
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0x00009106L, 0x0000931bL, 0x00009534L, 0x00009750L,
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0x00009971L, 0x00009b95L, 0x00009dbeL, 0x00009febL,
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0x0000a21cL, 0x0000a452L, 0x0000a68cL, 0x0000a8caL,
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0x0000ab0eL, 0x0000ad56L, 0x0000afa3L, 0x0000b1f5L,
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0x0000b44cL, 0x0000b6a8L, 0x0000b909L, 0x0000bb70L,
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0x0000bdddL, 0x0000c04fL, 0x0000c2c7L, 0x0000c545L,
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0x0000c7c9L, 0x0000ca53L, 0x0000cce3L, 0x0000cf7aL,
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0x0000d218L, 0x0000d4bcL, 0x0000d768L, 0x0000da1aL,
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0x0000dcd4L, 0x0000df95L, 0x0000e25eL, 0x0000e52eL,
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0x0000e806L, 0x0000eae7L, 0x0000edd0L, 0x0000f0c1L,
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0x0000f3bbL, 0x0000f6bfL, 0x0000f9cbL, 0x0000fce1L,
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0x00010000L, 0x00010329L, 0x0001065dL, 0x0001099aL,
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0x00010ce3L, 0x00011036L, 0x00011394L, 0x000116feL,
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0x00011a74L, 0x00011df6L, 0x00012184L, 0x0001251fL,
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0x000128c6L, 0x00012c7cL, 0x0001303fL, 0x00013410L,
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0x000137f0L, 0x00013bdfL, 0x00013fddL, 0x000143ebL,
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0x00014809L, 0x00014c37L, 0x00015077L, 0x000154c9L,
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0x0001592dL, 0x00015da4L, 0x0001622eL, 0x000166ccL,
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0x00016b7eL, 0x00017045L, 0x00017523L, 0x00017a17L,
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0x00017f22L, 0x00018444L, 0x00018980L, 0x00018ed5L,
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0x00019445L, 0x000199cfL, 0x00019f76L, 0x0001a53aL,
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0x0001ab1cL, 0x0001b11dL, 0x0001b73fL, 0x0001bd82L,
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0x0001c3e7L, 0x0001ca71L, 0x0001d11fL, 0x0001d7f4L,
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0x0001def1L, 0x0001e618L, 0x0001ed6aL, 0x0001f4e8L,
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0x0001fc96L, 0x00020473L, 0x00020c84L, 0x000214c9L,
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0x00021d44L, 0x000225f9L, 0x00022ee9L, 0x00023818L,
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0x00024187L, 0x00024b3aL, 0x00025534L, 0x00025f78L,
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0x00026a0aL, 0x000274edL, 0x00028026L, 0x00028bb8L,
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0x000297a8L, 0x0002a3fbL, 0x0002b0b5L, 0x0002bdddL,
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0x0002cb79L, 0x0002d98eL, 0x0002e823L, 0x0002f740L,
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0x000306ecL, 0x00031730L, 0x00032816L, 0x000339a6L,
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0x00034bebL, 0x00035ef2L, 0x000372c6L, 0x00038776L,
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0x00039d11L, 0x0003b3a6L, 0x0003cb48L, 0x0003e40aL,
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0x0003fe02L, 0x00041949L, 0x000435f7L, 0x0004542bL,
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0x00047405L, 0x000495a9L, 0x0004b940L, 0x0004def6L,
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0x00050700L, 0x00053196L, 0x00055ef9L, 0x00058f75L,
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0x0005c35dL, 0x0005fb14L, 0x00063709L, 0x000677c0L,
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0x0006bdd0L, 0x000709ecL, 0x00075ce6L, 0x0007b7bbL,
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0x00081b98L, 0x000889e9L, 0x0009046eL, 0x00098d4dL,
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0x000a2736L, 0x000ad593L, 0x000b9cc6L, 0x000c828aL,
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0x000d8e82L, 0x000ecb1bL, 0x001046eaL, 0x00121703L,
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0x00145b00L, 0x0017448dL, 0x001b2672L, 0x002095afL,
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0x0028bc49L, 0x0036519aL, 0x00517bb6L, 0x00a2f8fdL,
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0x46d3eab2L,
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};
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/**
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* clutter_tani:
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* @angle: a #ClutterAngle
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*
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* Very fast fixed point implementation of tan function.
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*
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* ClutterAngle is an integer such that 1024 represents
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* full circle.
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*
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* Return value: #ClutterFixed sine value.
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*
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* Since: 0.3
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*/
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ClutterFixed
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clutter_tani (ClutterAngle angle)
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{
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int sign = 1;
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ClutterFixed result;
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/* reduce negative angle to positive + sign */
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if (angle < 0)
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{
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sign = 1 + ~sign;
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angle = 1 + ~angle;
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}
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/* reduce to <0, pi) */
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angle &= 0x1ff;
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/* reduce to first quadrant and sign */
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if (angle > 256)
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{
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sign = 1 + ~sign;
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angle = 512 - angle;
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}
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result = tan_tbl[angle];
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if (sign < 0)
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result = (1 + ~result);
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return result;
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}
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ClutterFixed sqrt_tbl [] =
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{
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0x00000000L, 0x00010000L, 0x00016A0AL, 0x0001BB68L,
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@ -515,6 +633,46 @@ clutter_sqrti (gint number)
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return (number * flt2.i + 0x1e3c68) >> 22;
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}
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/**
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* clutter_fixed_qmulx:
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* @op1: #ClutterFixed
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* @op2: #ClutterFixed
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*
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* Return value: #ClutterFixed.
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*
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* Multiplies two fixed values using 64bit arithmetic; this provides
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* significantly better precission than the #CLUTTER_FIXED_MUL macro,
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* but at performance cost (about 2.7 times slowdown on ARMv5e, and 2 times
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* on x86).
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*
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* Since: 0.3
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*/
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ClutterFixed
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clutter_qmulx (ClutterFixed op1, ClutterFixed op2)
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{
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#ifdef __arm__
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/* This provides about 12% speedeup on the gcc -O2 optimised
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* C version
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*
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* Based on code found in the following thread:
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* http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2006-August/014405.html
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*/
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int res_low, res_hi;
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__asm__ ("smull %0, %1, %2, %3 \n"
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"mov %0, %0, lsr %4 \n"
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"add %1, %0, %1, lsl %5 \n"
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: "=r"(res_hi), "=r"(res_low)\
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: "r"(op1), "r"(op2), "i"(CFX_Q), "i"(32-CFX_Q));
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return (ClutterFixed) res_low;
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#else
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long long r = (long long) op1 * (long long) op2;
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return (unsigned int)(r >> CFX_Q);
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#endif
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}
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/* <private> */
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const double _magic = 68719476736.0*1.5;
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@ -575,3 +733,4 @@ _clutter_double_to_int (double val)
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}
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#undef _CFX_MAN
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@ -140,9 +140,14 @@ typedef gint32 ClutterAngle; /* angle such that 1024 == 2*PI */
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#define CFX_DIV CLUTTER_FIXED_DIV
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/* Fixed point math routines */
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extern inline
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ClutterFixed clutter_qmulx (ClutterFixed op1, ClutterFixed op2);
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ClutterFixed clutter_sinx (ClutterFixed angle);
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ClutterFixed clutter_sini (ClutterAngle angle);
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ClutterFixed clutter_tani (ClutterAngle angle);
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/* convenience macros for the cos functions */
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/**
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@ -48,6 +48,8 @@
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#include <gdk-pixbuf-xlib/gdk-pixbuf-xlib.h>
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#define FIXED_PERSPECTIVE
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G_DEFINE_ABSTRACT_TYPE (ClutterStage, clutter_stage, CLUTTER_TYPE_GROUP);
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#define CLUTTER_STAGE_GET_PRIVATE(obj) \
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@ -622,6 +624,11 @@ clutter_stage_snapshot (ClutterStage *stage,
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return NULL;
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}
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#ifndef FIXED_PERSPECTIVE
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/*
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* Original floating point implementaiton of the perspective function,
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* retained for reference purposes
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*/
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static inline void
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frustum (GLfloat left,
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GLfloat right,
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@ -658,13 +665,60 @@ perspective (GLfloat fovy,
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{
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GLfloat xmin, xmax, ymin, ymax;
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ymax = zNear * tan (fovy * M_PI / 360.0);
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ymax = zNear * tan (fovy * M_PI / 180.0);
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ymin = -ymax;
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xmin = ymin * aspect;
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xmax = ymax * aspect;
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printf ("%f, %f, %f, %f\n", xmin, xmax, ymin, ymax);
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frustum (xmin, xmax, ymin, ymax, zNear, zFar);
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}
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#else
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/*
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* Fixed point implementation of the perspective function
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*/
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static inline void
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perspectivex (ClutterAngle fovy,
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ClutterFixed aspect,
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ClutterFixed zNear,
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ClutterFixed zFar)
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{
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ClutterFixed xmax, ymax;
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ClutterFixed x, y, c, d;
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GLfloat m[16];
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memset (&m[0], 0, sizeof (m));
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/*
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* Based on the original algorithm in perspective():
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*
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* 1) xmin = -xmax => xmax + xmin == 0 && xmax - xmin == 2 * xmax
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* same true for y, hence: a == 0 && b == 0;
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*
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* 2) When working with small numbers, we can are loosing significant
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* precision, hence we use clutter_qmulx() here, not the fast macro.
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*/
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ymax = clutter_qmulx (zNear, clutter_tani (fovy));
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xmax = clutter_qmulx (ymax, aspect);
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x = CFX_DIV (zNear, xmax);
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y = CFX_DIV (zNear, ymax);
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c = CFX_DIV (-(zFar + zNear), ( zFar - zNear));
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d = CFX_DIV (-(clutter_qmulx (2*zFar, zNear)), (zFar - zNear));
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#define M(row,col) m[col*4+row]
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M(0,0) = CLUTTER_FIXED_TO_FLOAT (x);
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M(1,1) = CLUTTER_FIXED_TO_FLOAT (y);
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M(2,2) = CLUTTER_FIXED_TO_FLOAT (c);
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M(2,3) = CLUTTER_FIXED_TO_FLOAT (d);
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M(3,2) = -1.0F;
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#undef M
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glMultMatrixf (m);
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}
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#endif
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void
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_clutter_stage_sync_viewport (ClutterStage *stage)
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@ -683,8 +737,15 @@ _clutter_stage_sync_viewport (ClutterStage *stage)
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glMatrixMode (GL_PROJECTION);
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glLoadIdentity ();
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perspective (60.0f, 1.0f, 0.1f, 100.0f);
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#ifndef FIXED_PERSPECTIVE
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perspective (30.0f, 1.0f, 0.1f, 100.0f);
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#else
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perspectivex (85, /* 30 degrees */
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CFX_ONE,
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CLUTTER_FLOAT_TO_FIXED (0.1),
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CLUTTER_FLOAT_TO_FIXED (100.0));
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#endif
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glMatrixMode (GL_MODELVIEW);
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glLoadIdentity ();
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@ -740,7 +801,14 @@ clutter_stage_get_actor_at_pos (ClutterStage *stage,
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(view[3] - 2 * (y - view[1])), 0);
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glScalef (view[2], -view[3], 1.0);
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perspective (60.0f, 1.0f, 0.1f, 100.0f);
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#ifndef FIXED_PERSPECTIVE
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perspective (30.0f, 1.0f, 0.1f, 100.0f);
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#else
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perspectivex (85, /* 30 degrees */
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CFX_ONE,
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CLUTTER_FLOAT_TO_FIXED (0.1),
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CLUTTER_FLOAT_TO_FIXED (100.0));
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#endif
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glMatrixMode (GL_MODELVIEW);
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@ -106,7 +106,7 @@ case $clutterbackend in
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glx)
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CLUTTER_FLAVOUR="glx"
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CLUTTER_GOGL="gl"
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CLUTTER_COGL="gl"
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AC_DEFINE([HAVE_CLUTTER_GLX], 1, [Have the GLX backend])
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AC_CHECK_HEADERS([GL/gl.h GL/glx.h],,
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