WebSVN – Kolibri OS – Blame – /contrib/other/sdlquake-1.0.9/d_copy.S

Rev	Author	Line No.	Line
5131	clevermous	1	//
		2	// d_copy.s
		3	// x86 assembly-language screen copying code.
		4	//
		5
		6	#include "asm_i386.h"
		7	#include "quakeasm.h"
		8	#include "asm_draw.h"
		9
		10	.data
		11
		12	LCopyWidth: .long 0
		13	LBlockSrcStep: .long 0
		14	LBlockDestStep: .long 0
		15	LSrcDelta: .long 0
		16	LDestDelta: .long 0
		17
		18	#define bufptr 4+16
		19
		20	// copies 16 rows per plane at a pop; idea is that 16*512 = 8k, and since
		21	// no Mode X mode is wider than 360, all the data should fit in the cache for
		22	// the passes for the next 3 planes
		23
		24	.text
		25
		26	.globl C(VGA_UpdatePlanarScreen)
		27	C(VGA_UpdatePlanarScreen):
		28	pushl %ebp // preserve caller's stack frame
		29	pushl %edi
		30	pushl %esi // preserve register variables
		31	pushl %ebx
		32
		33	movl C(VGA_bufferrowbytes),%eax
		34	shll $1,%eax
		35	movl %eax,LBlockSrcStep
		36	movl C(VGA_rowbytes),%eax
		37	shll $1,%eax
		38	movl %eax,LBlockDestStep
		39
		40	movl $0x3C4,%edx
		41	movb $2,%al
		42	outb %al,%dx // point the SC to the Map Mask
		43	incl %edx
		44
		45	movl bufptr(%esp),%esi
		46	movl C(VGA_pagebase),%edi
		47	movl C(VGA_height),%ebp
		48	shrl $1,%ebp
		49
		50	movl C(VGA_width),%ecx
		51	movl C(VGA_bufferrowbytes),%eax
		52	subl %ecx,%eax
		53	movl %eax,LSrcDelta
		54	movl C(VGA_rowbytes),%eax
		55	shll $2,%eax
		56	subl %ecx,%eax
		57	movl %eax,LDestDelta
		58	shrl $4,%ecx
		59	movl %ecx,LCopyWidth
		60
		61	LRowLoop:
		62	movb $1,%al
		63
		64	LPlaneLoop:
		65	outb %al,%dx
		66	movb $2,%ah
		67
		68	pushl %esi
		69	pushl %edi
		70	LRowSetLoop:
		71	movl LCopyWidth,%ecx
		72	LColumnLoop:
		73	movb 12(%esi),%bh
		74	movb 8(%esi),%bl
		75	shll $16,%ebx
		76	movb 4(%esi),%bh
		77	movb (%esi),%bl
		78	movl %ebx,(%edi)
		79	addl $16,%esi
		80	addl $4,%edi
		81	decl %ecx
		82	jnz LColumnLoop
		83
		84	addl LDestDelta,%edi
		85	addl LSrcDelta,%esi
		86	decb %ah
		87	jnz LRowSetLoop
		88
		89	popl %edi
		90	popl %esi
		91	incl %esi
		92
		93	shlb $1,%al
		94	cmpb $16,%al
		95	jnz LPlaneLoop
		96
		97	subl $4,%esi
		98	addl LBlockSrcStep,%esi
		99	addl LBlockDestStep,%edi
		100	decl %ebp
		101	jnz LRowLoop
		102
		103	popl %ebx // restore register variables
		104	popl %esi
		105	popl %edi
		106	popl %ebp // restore the caller's stack frame
		107
		108	ret
		109
		110
		111	#define srcptr 4+16
		112	#define destptr 8+16
		113	#define width 12+16
		114	#define height 16+16
		115	#define srcrowbytes 20+16
		116	#define destrowbytes 24+16
		117
		118	.globl C(VGA_UpdateLinearScreen)
		119	C(VGA_UpdateLinearScreen):
		120	pushl %ebp // preserve caller's stack frame
		121	pushl %edi
		122	pushl %esi // preserve register variables
		123	pushl %ebx
		124
		125	cld
		126	movl srcptr(%esp),%esi
		127	movl destptr(%esp),%edi
		128	movl width(%esp),%ebx
		129	movl srcrowbytes(%esp),%eax
		130	subl %ebx,%eax
		131	movl destrowbytes(%esp),%edx
		132	subl %ebx,%edx
		133	shrl $2,%ebx
		134	movl height(%esp),%ebp
		135	LLRowLoop:
		136	movl %ebx,%ecx
		137	rep/movsl (%esi),(%edi)
		138	addl %eax,%esi
		139	addl %edx,%edi
		140	decl %ebp
		141	jnz LLRowLoop
		142
		143	popl %ebx // restore register variables
		144	popl %esi
		145	popl %edi
		146	popl %ebp // restore the caller's stack frame
		147
		148	ret
		149

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(root)/contrib/other/sdlquake-1.0.9/d_copy.S – Rev 6642