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Allow for more fine tuning of Duff's device routines

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This commit is contained in:
Cameron Cawley 2024-10-12 17:20:32 +01:00 • committed by Sam Lantinga
parent 90f792f83c
commit 084dbb6410
4 changed files with 62 additions and 36 deletions
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46
src/video/SDL_blit.h
View file

@ -471,6 +471,15 @@ extern SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface *surface);
#else
#define USE_DUFFS_LOOP
#endif
#define DUFFS_LOOP1(pixel_copy_increment, width) \
{ \
int n; \
for (n = width; n > 0; --n) { \
pixel_copy_increment; \
} \
}
#ifdef USE_DUFFS_LOOP
/* 8-times unrolled loop */
@ -527,8 +536,26 @@ extern SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface *surface);
} \
}
/* Use the 8-times version of the loop by default */
/* 2-times unrolled loop */
#define DUFFS_LOOP2(pixel_copy_increment, width) \
{ \
int n = (width + 1) / 2; \
switch (width & 1) { \
case 0: \
do { \
pixel_copy_increment; \
SDL_FALLTHROUGH; \
case 1: \
pixel_copy_increment; \
} while (--n > 0); \
} \
}
/* Use the 4-times version of the loop by default */
#define DUFFS_LOOP(pixel_copy_increment, width) \
DUFFS_LOOP4(pixel_copy_increment, width)
/* Use the 8-times version of the loop for simple routines */
#define DUFFS_LOOP_TRIVIAL(pixel_copy_increment, width) \
DUFFS_LOOP8(pixel_copy_increment, width)
/* Special version of Duff's device for even more optimization */
@ -562,20 +589,19 @@ extern SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface *surface);
/* Don't use Duff's device to unroll loops */
#define DUFFS_LOOP(pixel_copy_increment, width) \
{ \
int n; \
for (n = width; n > 0; --n) { \
pixel_copy_increment; \
} \
}
DUFFS_LOOP1(pixel_copy_increment, width)
#define DUFFS_LOOP_TRIVIAL(pixel_copy_increment, width) \
DUFFS_LOOP1(pixel_copy_increment, width)
#define DUFFS_LOOP8(pixel_copy_increment, width) \
DUFFS_LOOP(pixel_copy_increment, width)
DUFFS_LOOP1(pixel_copy_increment, width)
#define DUFFS_LOOP4(pixel_copy_increment, width) \
DUFFS_LOOP(pixel_copy_increment, width)
DUFFS_LOOP1(pixel_copy_increment, width)
#define DUFFS_LOOP2(pixel_copy_increment, width) \
DUFFS_LOOP1(pixel_copy_increment, width)
#define DUFFS_LOOP_124(pixel_copy_increment1, \
pixel_copy_increment2, \
pixel_copy_increment4, width) \
DUFFS_LOOP(pixel_copy_increment1, width)
DUFFS_LOOP1(pixel_copy_increment1, width)
#endif /* USE_DUFFS_LOOP */

16
src/video/SDL_blit_1.c
View file

@ -50,7 +50,7 @@ static void Blit1to1(SDL_BlitInfo *info)
while (height--) {
#ifdef USE_DUFFS_LOOP
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
{
*dst = map[*src];
}
@ -102,7 +102,7 @@ static void Blit1to2(SDL_BlitInfo *info)
#ifdef USE_DUFFS_LOOP
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
{
*(Uint16 *)dst = map[*src++];
dst += 2;
@ -258,7 +258,7 @@ static void Blit1to4(SDL_BlitInfo *info)
while (height--) {
#ifdef USE_DUFFS_LOOP
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
*dst++ = map[*src++];
, width);
/* *INDENT-ON* */ /* clang-format on */
@ -299,7 +299,7 @@ static void Blit1to1Key(SDL_BlitInfo *info)
if (palmap) {
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
{
if ( *src != ckey ) {
*dst = palmap[*src];
@ -315,7 +315,7 @@ static void Blit1to1Key(SDL_BlitInfo *info)
} else {
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
{
if ( *src != ckey ) {
*dst = *src;
@ -347,7 +347,7 @@ static void Blit1to2Key(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
{
if ( *src != ckey ) {
*dstp=palmap[*src];
@ -410,7 +410,7 @@ static void Blit1to4Key(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
{
if ( *src != ckey ) {
*dstp = palmap[*src];
@ -446,7 +446,7 @@ static void Blit1toNAlpha(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP4(
DUFFS_LOOP(
{
sR = srcpal[*src].r;
sG = srcpal[*src].g;

22
src/video/SDL_blit_A.c
View file

@ -47,7 +47,7 @@ static void BlitNto1SurfaceAlpha(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP4(
DUFFS_LOOP(
{
DISEMBLE_RGB(src, srcbpp, srcfmt, Pixel, sR, sG, sB);
dR = dstfmt->palette->colors[*dst].r;
@ -92,7 +92,7 @@ static void BlitNto1PixelAlpha(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP4(
DUFFS_LOOP(
{
DISEMBLE_RGBA(src,srcbpp,srcfmt,Pixel,sR,sG,sB,sA);
dR = dstfmt->palette->colors[*dst].r;
@ -484,7 +484,7 @@ static void BlitRGBtoRGBSurfaceAlpha128(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP4({
DUFFS_LOOP({
Uint32 s = *srcp++;
Uint32 d = *dstp;
*dstp++ = ((((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1)
@ -516,7 +516,7 @@ static void BlitRGBtoRGBSurfaceAlpha(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP4({
DUFFS_LOOP({
s = *srcp;
d = *dstp;
s1 = s & 0xff00ff;
@ -1148,7 +1148,7 @@ static void Blit565to565SurfaceAlpha(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP4({
DUFFS_LOOP({
Uint32 s = *srcp++;
Uint32 d = *dstp;
/*
@ -1186,7 +1186,7 @@ static void Blit555to555SurfaceAlpha(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP4({
DUFFS_LOOP({
Uint32 s = *srcp++;
Uint32 d = *dstp;
/*
@ -1219,7 +1219,7 @@ static void BlitARGBto565PixelAlpha(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP4({
DUFFS_LOOP({
Uint32 s = *srcp;
unsigned alpha = s >> 27; /* downscale alpha to 5 bits */
/* Here we special-case opaque alpha since the
@ -1262,7 +1262,7 @@ static void BlitARGBto555PixelAlpha(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP4({
DUFFS_LOOP({
unsigned alpha;
Uint32 s = *srcp;
alpha = s >> 27; /* downscale alpha to 5 bits */
@ -1315,7 +1315,7 @@ static void BlitNtoNSurfaceAlpha(SDL_BlitInfo *info)
if (sA) {
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP4(
DUFFS_LOOP(
{
DISEMBLE_RGB(src, srcbpp, srcfmt, Pixel, sR, sG, sB);
DISEMBLE_RGBA(dst, dstbpp, dstfmt, Pixel, dR, dG, dB, dA);
@ -1353,7 +1353,7 @@ static void BlitNtoNSurfaceAlphaKey(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP4(
DUFFS_LOOP(
{
RETRIEVE_RGB_PIXEL(src, srcbpp, Pixel);
if (sA && Pixel != ckey) {
@ -1395,7 +1395,7 @@ static void BlitNtoNPixelAlpha(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP4(
DUFFS_LOOP(
{
DISEMBLE_RGBA(src, srcbpp, srcfmt, Pixel, sR, sG, sB, sA);
if (sA) {

14
src/video/SDL_blit_N.c
View file

@ -2076,7 +2076,7 @@ static void Blit_RGB555_ARGB1555(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
{
*dst = *src | mask;
++dst;
@ -2200,7 +2200,7 @@ static void Blit4to4MaskAlpha(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
{
*dst = *src | mask;
++dst;
@ -2217,7 +2217,7 @@ static void Blit4to4MaskAlpha(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
{
*dst = *src & mask;
++dst;
@ -2576,7 +2576,7 @@ static void Blit2to2Key(SDL_BlitInfo *info)
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
{
if ( (*srcp & rgbmask) != ckey ) {
*dstp = *srcp;
@ -2622,7 +2622,7 @@ static void BlitNtoNKey(SDL_BlitInfo *info)
Uint32 mask = ((Uint32)info->a) << dstfmt->Ashift;
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
{
if ((*src32 & rgbmask) != ckey) {
*dst32 = *src32 | mask;
@ -2640,7 +2640,7 @@ static void BlitNtoNKey(SDL_BlitInfo *info)
Uint32 mask = srcfmt->Rmask | srcfmt->Gmask | srcfmt->Bmask;
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
{
if ((*src32 & rgbmask) != ckey) {
*dst32 = *src32 & mask;
@ -2897,7 +2897,7 @@ static void BlitNtoNKeyCopyAlpha(SDL_BlitInfo *info)
Uint32 *dst32 = (Uint32 *)dst;
while (height--) {
/* *INDENT-OFF* */ /* clang-format off */
DUFFS_LOOP(
DUFFS_LOOP_TRIVIAL(
{
if ((*src32 & rgbmask) != ckey) {
*dst32 = *src32;