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Switch from 32-bit floats to 16-bit half-floats.

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Massive bandwidth savings, or so I'm told. Yay?
This commit is contained in:
Corbin Simpson 2008-08-02 02:36:21 -07:00 • committed by Alex Deucher
commit 48b09ca40c
4 changed files with 673 additions and 646 deletions
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1284
src/bicubic_table.h
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31
src/bicubic_table.py
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@ -2,6 +2,32 @@
import struct
def half(i):
fs, fe, fm = ((i >> 31) & 0x1, (i >> 23) & 0xff, i & 0x7fffff)
s, e, m = (fs, 0, 0)
if (fe == 0x0):
pass
if ((fe == 0xff) and (fm == 0x0)):
e = 31
elif (fe == 0xff):
m = 1
e = 31
else:
exp = fe - 127;
if (exp < -24):
pass
elif (exp < -14):
temp = 10 - (-14 - exp)
m = 2**temp + (m >> (23 - temp))
elif (exp > 15):
e = 31
else:
e = exp + 15
m = fm >> 13
return ((s << 15) | (e << 10) | m)
def texgen(pix):
tex = []
@ -26,14 +52,15 @@ def texgen(pix):
def printrow(l, offset):
seq = [ hex(struct.unpack('<I',struct.pack('f',i))[0]) for i in l[offset:offset+4] ]
seq = [ struct.unpack('<I',struct.pack('f',i))[0] for i in l[offset:offset+4] ]
seq = [ hex(half(i)) for i in seq ]
return "\t" + ", ".join(seq) + ","
def maketable(pix):
l = texgen(pix)
print "static const uint32_t bicubic_tex_" + str(pix) + "[] = {"
print "static const uint16_t bicubic_tex_" + str(pix) + "[] = {"
for i in range(0, pix, 4):

2
src/radeon_textured_video.c
View file

@ -283,7 +283,7 @@ RADEONPutImageTextured(ScrnInfoPtr pScrn,
/* Upload bicubic filter tex */
if (pPriv->bicubic_enabled)
RADEONCopyData(pScrn, (uint8_t *)bicubic_tex_512, (uint8_t *)(info->FB + pPriv->bicubic_offset), 2048, 2048, 1, 512, 4);
RADEONCopyData(pScrn, (uint8_t *)bicubic_tex_512, (uint8_t *)(info->FB + pPriv->bicubic_offset), 1024, 1024, 1, 512, 2);
/* update cliplist */
if (!REGION_EQUAL(pScrn->pScreen, &pPriv->clip, clipBoxes)) {

2
src/radeon_textured_videofuncs.c
View file

@ -221,7 +221,7 @@ FUNC_NAME(RADEONDisplayTexturedVideo)(ScrnInfoPtr pScrn, RADEONPortPrivPtr pPriv
(0x0 << R300_TXHEIGHT_SHIFT) |
R300_TXPITCH_EN;
/* Format is 32-bit floats, 4bpp */
txformat1 = R300_EASY_TX_FORMAT(Z, Y, X, W, FL_R32G32B32A32);
txformat1 = R300_EASY_TX_FORMAT(Z, Y, X, W, FL_R16G16B16A16);
/* Pitch is 127 (128-1) */
txpitch = 0x7f;
/* Tex filter */