From 9b8745d5250c9d0b60c9aa5a77f58a3fcddf1076 Mon Sep 17 00:00:00 2001
From: Tom Schouten <doelie@users.sourceforge.net>
Date: Tue, 21 Jan 2003 10:27:33 +0000
Subject: This commit was generated by cvs2svn to compensate for changes in
 r352, which included commits to RCS files with non-trunk default branches.

svn path=/trunk/externals/pdp/; revision=353
---
 system/mmx/pixel_gain.s | 83 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 system/mmx/pixel_gain.s

(limited to 'system/mmx/pixel_gain.s')

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
+	
-- 
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