aboutsummaryrefslogtreecommitdiff
path: root/system/mmx/pixel_gain.s
diff options
context:
space:
mode:
authorTom Schouten <doelie@users.sourceforge.net>2003-01-21 10:27:33 +0000
committerTom Schouten <doelie@users.sourceforge.net>2003-01-21 10:27:33 +0000
commit9b8745d5250c9d0b60c9aa5a77f58a3fcddf1076 (patch)
tree8372b6a414a7124cec57efc9c80845e2bc1b157d /system/mmx/pixel_gain.s
This commit was generated by cvs2svn to compensate for changes in r352,svn2git-root
which included commits to RCS files with non-trunk default branches. svn path=/trunk/externals/pdp/; revision=353
Diffstat (limited to 'system/mmx/pixel_gain.s')
-rw-r--r--system/mmx/pixel_gain.s83
1 files changed, 83 insertions, 0 deletions
diff --git a/system/mmx/pixel_gain.s b/system/mmx/pixel_gain.s
new file mode 100644
index 0000000..5cd5057
--- /dev/null
+++ b/system/mmx/pixel_gain.s
@@ -0,0 +1,83 @@
+# Pure Data Packet mmx routine.
+# Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+#
+.globl pixel_gain
+.type pixel_gain,@function
+
+# mmx rgba pixel gain
+# void asmtest(char *pixelarray, int32 nbpixels, int *rgba_gain)
+# gains are 7.9 fixed point for rgba
+
+pixel_gain:
+ pushl %ebp
+ movl %esp, %ebp
+ push %esi
+ push %edi
+
+ movl 8(%ebp), %esi # pixel array offset
+ movl 12(%ebp), %ecx # nb of elements
+ movl 16(%ebp), %edi # int16[4] array of gains
+
+ prefetch (%esi)
+
+ emms
+ sarl $2, %ecx # process 4 pixels per loop iteration
+ jz .exit
+ movq (%edi), %mm7 # read gain array from memory
+ jmp .loop_gain
+
+ .align 16
+ .loop_gain:
+
+ prefetch 128(%esi)
+ movq (%esi), %mm5 # load pixel 1-2 from memory
+ movq 8(%esi), %mm6 # load pixel 3-4 from memory
+ pxor %mm0, %mm0 # zero mm0 - mm3
+ pxor %mm1, %mm1
+ pxor %mm2, %mm2
+ pxor %mm3, %mm3
+ punpcklbw %mm5, %mm0 # unpack 1st pixel into 8.8 bit ints
+ punpckhbw %mm5, %mm1 # unpack 2nd
+ punpcklbw %mm6, %mm2 # unpack 3rd
+ punpckhbw %mm6, %mm3 # unpack 4th
+ psrlw $0x1, %mm0 # shift right to clear sign bit 9.7
+ psrlw $0x1, %mm1
+ psrlw $0x1, %mm2
+ psrlw $0x1, %mm3
+
+ pmulhw %mm7, %mm0 # multiply 1st pixel 9.7 * 7.9 -> 16.0
+ pmulhw %mm7, %mm1 # multiply 2nd
+ pmulhw %mm7, %mm2 # multiply 3rd
+ pmulhw %mm7, %mm3 # multiply 4th
+
+ packuswb %mm1, %mm0 # pack & saturate to 8bit vector
+ movq %mm0, (%esi) # store result in memory
+ packuswb %mm3, %mm2 # pack & saturate to 8bit vector
+ movq %mm2, 8(%esi) # store result in memory
+
+ addl $16, %esi # increment source pointer
+ decl %ecx
+ jnz .loop_gain # loop
+
+ .exit:
+ emms
+
+ pop %edi
+ pop %esi
+ leave
+ ret
+