git.y1.nz

commit 15da22ad72b4781c4df50ba38a713407a298ba08
parent 5450ff5219897e416d8d39699d3348916ec7549e
Author: Toxa <untoxa@mail.ru>
Date:   Thu, 19 Aug 2021 12:46:07 +0300

optimize .copy_vram a bit; add vmemcpy() alias for it.

Diffstat:
M
gbdk-lib/include/gb/gb.h
21
+++++++++++++++++++--
M
gbdk-lib/libc/targets/gbz80/cpy_data.s
63
++++++++++++++++++++++++++++++++++-----------------------------
M
gbdk-lib/libc/targets/gbz80/set_t.s
2
+-

3 files changed, 54 insertions(+), 32 deletions(-)
diff --git a/gbdk-lib/include/gb/gb.h b/gbdk-lib/include/gb/gb.h
@@ -1362,7 +1362,7 @@ inline void hide_sprite(uint8_t nb) {
 
 
 
-/** Copies Tile Pattern data to an address in VRAM
+/** Copies arbitrary data to an address in VRAM
 
     @param vram_addr Pointer to destination VRAM Address
     @param data      Pointer to source buffer
@@ -1379,7 +1379,7 @@ void set_data(uint8_t *vram_addr,
           uint16_t len) NONBANKED __preserves_regs(b, c);
 
 
-/** Copies Tile Pattern data from an address in VRAM into a buffer
+/** Copies arbitrary data from an address in VRAM into a buffer
 
     @param vram_addr Pointer to source VRAM Address
     @param data      Pointer to destination buffer
@@ -1395,6 +1395,23 @@ void get_data(uint8_t *data,
           uint8_t *vram_addr,
           uint16_t len) NONBANKED __preserves_regs(b, c);
 
+/** Copies arbitrary data from an address in VRAM into a buffer
+
+    @param dest      Pointer to destination buffer (may be in VRAM)
+    @param sour      Pointer to source buffer (may be in VRAM)
+    @param len       Number of bytes to copy
+
+    Copies __len__ bytes from or to VRAM starting at __sour__ into a buffer or to VRAM at __dest__.
+
+    GBC only: @ref VBK_REG determines which bank of Background tile patterns are written to.
+    \li VBK_REG=0 indicates the first bank
+    \li VBK_REG=1 indicates the second
+*/
+void vmemcpy(uint8_t *dest,
+          uint8_t *sour,
+          uint16_t len) NONBANKED __preserves_regs(b, c);
+
+
 
 /** Sets a rectangular region of Tile Map entries at a given VRAM Address.
 
diff --git a/gbdk-lib/libc/targets/gbz80/cpy_data.s b/gbdk-lib/libc/targets/gbz80/cpy_data.s
@@ -1,39 +1,44 @@
-	.include	"global.s"
+        .include	"global.s"
 
-	;; BANKED: checked
-	.area	_BASE
-	;; Copy part (size = DE) of the VRAM from (BC) to (HL)
+        ;; BANKED: checked
+        .area	_BASE
+        ;; Copy part (size = DE) of the VRAM from (BC) to (HL)
 .copy_vram::
+        INC     D
+        INC     E
+        JR      2$
 1$:
-	WAIT_STAT
+        WAIT_STAT
 
-	LD	A,(BC)
-	LD	(HL+),A
-	INC	BC
-	DEC	DE
-	LD	A,D
-	OR	E
-	JR	NZ,1$
-	RET
+        LD	A,(BC)
+        LD	(HL+),A
+        INC	BC
+2$:
+        DEC     E
+        JR      NZ, 1$
+        DEC     D
+        JR      NZ, 1$
+        RET
 
+_vmemcpy::
 _set_data::
 _get_data::
-	PUSH	BC
+        PUSH	BC
 
-	LDA	HL,9(SP)	; Skip return address and registers
-	LD	A,(HL-)		; DE = len
-	LD	D, A
-	LD	A,(HL-)
-	LD	E, A
-	LD	A,(HL-)		; BC = src
-	LD	B, A
-	LD	A,(HL-)
-	LD	C, A
-	LD	A,(HL-)		; HL = dst
-	LD	L,(HL)
-	LD	H,A
+        LDA	HL,9(SP)	; Skip return address and registers
+        LD	A,(HL-)		; DE = len
+        LD	D, A
+        LD	A,(HL-)
+        LD	E, A
+        LD	A,(HL-)		; BC = src
+        LD	B, A
+        LD	A,(HL-)
+        LD	C, A
+        LD	A,(HL-)		; HL = dst
+        LD	L,(HL)
+        LD	H,A
 
-	CALL	.copy_vram
+        CALL	.copy_vram
 
-	POP	BC
-	RET
+        POP	BC
+        RET
diff --git a/gbdk-lib/libc/targets/gbz80/set_t.s b/gbdk-lib/libc/targets/gbz80/set_t.s
@@ -2,7 +2,7 @@
 
         .globl  .set_xy_tt
 
-	;; BANKED: checked, imperfect
+        ;; BANKED: checked, imperfect
         .area   _BASE
 
 ; void set_tiles(uint8_t x, uint8_t y, uint8_t w, uint8_t h, uint8_t *vram_addr, const uint8_t *tiles);

This webpage is intended to be an accessible preview of this repository. To get a fuller picture, clone it and use the git CLI.