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SDL_blit: use a named enum for required hardware bits in dispatch tables

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This commit is contained in:
Ben Avison 2019-10-24 21:15:09 -04:00
parent 0eaa52cedf
commit 8425d9d5d0
1 changed files with 22 additions and 15 deletions
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37
src/video/SDL_blit_N.c
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@ -38,6 +38,12 @@
/* Functions to blit from N-bit surfaces to other surfaces */ /* Functions to blit from N-bit surfaces to other surfaces */
enum blit_features {
BLIT_FEATURE_HAS_MMX = 1,
BLIT_FEATURE_HAS_ALTIVEC = 2,
BLIT_FEATURE_ALTIVEC_DONT_USE_PREFETCH = 4
};
#if SDL_ALTIVEC_BLITTERS #if SDL_ALTIVEC_BLITTERS
#ifdef HAVE_ALTIVEC_H #ifdef HAVE_ALTIVEC_H
#include <altivec.h> #include <altivec.h>
@ -894,25 +900,26 @@ ConvertAltivec32to32_prefetch(SDL_BlitInfo * info)
vec_dss(DST_CHAN_DEST); vec_dss(DST_CHAN_DEST);
} }
static Uint32 static enum blit_features
GetBlitFeatures(void) GetBlitFeatures(void)
{ {
static Uint32 features = 0xffffffff; static enum blit_features features = -1;
if (features == 0xffffffff) { if (features == (enum blit_features) -1) {
/* Provide an override for testing .. */ /* Provide an override for testing .. */
char *override = SDL_getenv("SDL_ALTIVEC_BLIT_FEATURES"); char *override = SDL_getenv("SDL_ALTIVEC_BLIT_FEATURES");
if (override) { if (override) {
features = 0; unsigned int features_as_uint = 0;
SDL_sscanf(override, "%u", &features); SDL_sscanf(override, "%u", &features_as_uint);
features = (enum blit_features) features_as_uint;
} else { } else {
features = (0 features = (0
/* Feature 1 is has-MMX */ /* Feature 1 is has-MMX */
| ((SDL_HasMMX())? 1 : 0) | ((SDL_HasMMX())? BLIT_FEATURE_HAS_MMX : 0)
/* Feature 2 is has-AltiVec */ /* Feature 2 is has-AltiVec */
| ((SDL_HasAltiVec())? 2 : 0) | ((SDL_HasAltiVec())? BLIT_FEATURE_HAS_ALTIVEC : 0)
/* Feature 4 is dont-use-prefetch */ /* Feature 4 is dont-use-prefetch */
/* !!!! FIXME: Check for G5 or later, not the cache size! Always prefetch on a G4. */ /* !!!! FIXME: Check for G5 or later, not the cache size! Always prefetch on a G4. */
| ((GetL3CacheSize() == 0) ? 4 : 0) | ((GetL3CacheSize() == 0) ? BLIT_FEATURE_ALTIVEC_DONT_USE_PREFETCH : 0)
); );
} }
} }
@ -924,7 +931,7 @@ GetBlitFeatures(void)
#endif #endif
#else #else
/* Feature 1 is has-MMX */ /* Feature 1 is has-MMX */
#define GetBlitFeatures() ((Uint32)(SDL_HasMMX() ? 1 : 0)) #define GetBlitFeatures() (SDL_HasMMX() ? BLIT_FEATURE_HAS_MMX : 0)
#endif #endif
/* This is now endian dependent */ /* This is now endian dependent */
@ -3185,7 +3192,7 @@ struct blit_table
Uint32 srcR, srcG, srcB; Uint32 srcR, srcG, srcB;
int dstbpp; int dstbpp;
Uint32 dstR, dstG, dstB; Uint32 dstR, dstG, dstB;
Uint32 blit_features; enum blit_features blit_features;
SDL_BlitFunc blitfunc; SDL_BlitFunc blitfunc;
Uint32 alpha; /* bitwise NO_ALPHA, SET_ALPHA, COPY_ALPHA */ Uint32 alpha; /* bitwise NO_ALPHA, SET_ALPHA, COPY_ALPHA */
}; };
@ -3198,9 +3205,9 @@ static const struct blit_table normal_blit_2[] = {
#if SDL_ALTIVEC_BLITTERS #if SDL_ALTIVEC_BLITTERS
/* has-altivec */ /* has-altivec */
{0x0000F800, 0x000007E0, 0x0000001F, 4, 0x00000000, 0x00000000, 0x00000000, {0x0000F800, 0x000007E0, 0x0000001F, 4, 0x00000000, 0x00000000, 0x00000000,
2, Blit_RGB565_32Altivec, NO_ALPHA | COPY_ALPHA | SET_ALPHA}, BLIT_FEATURE_HAS_ALTIVEC, Blit_RGB565_32Altivec, NO_ALPHA | COPY_ALPHA | SET_ALPHA},
{0x00007C00, 0x000003E0, 0x0000001F, 4, 0x00000000, 0x00000000, 0x00000000, {0x00007C00, 0x000003E0, 0x0000001F, 4, 0x00000000, 0x00000000, 0x00000000,
2, Blit_RGB555_32Altivec, NO_ALPHA | COPY_ALPHA | SET_ALPHA}, BLIT_FEATURE_HAS_ALTIVEC, Blit_RGB555_32Altivec, NO_ALPHA | COPY_ALPHA | SET_ALPHA},
#endif #endif
{0x0000F800, 0x000007E0, 0x0000001F, 4, 0x00FF0000, 0x0000FF00, 0x000000FF, {0x0000F800, 0x000007E0, 0x0000001F, 4, 0x00FF0000, 0x0000FF00, 0x000000FF,
0, Blit_RGB565_ARGB8888, NO_ALPHA | COPY_ALPHA | SET_ALPHA}, 0, Blit_RGB565_ARGB8888, NO_ALPHA | COPY_ALPHA | SET_ALPHA},
@ -3255,13 +3262,13 @@ static const struct blit_table normal_blit_4[] = {
#if SDL_ALTIVEC_BLITTERS #if SDL_ALTIVEC_BLITTERS
/* has-altivec | dont-use-prefetch */ /* has-altivec | dont-use-prefetch */
{0x00000000, 0x00000000, 0x00000000, 4, 0x00000000, 0x00000000, 0x00000000, {0x00000000, 0x00000000, 0x00000000, 4, 0x00000000, 0x00000000, 0x00000000,
6, ConvertAltivec32to32_noprefetch, NO_ALPHA | COPY_ALPHA | SET_ALPHA}, BLIT_FEATURE_HAS_ALTIVEC | BLIT_FEATURE_ALTIVEC_DONT_USE_PREFETCH, ConvertAltivec32to32_noprefetch, NO_ALPHA | COPY_ALPHA | SET_ALPHA},
/* has-altivec */ /* has-altivec */
{0x00000000, 0x00000000, 0x00000000, 4, 0x00000000, 0x00000000, 0x00000000, {0x00000000, 0x00000000, 0x00000000, 4, 0x00000000, 0x00000000, 0x00000000,
2, ConvertAltivec32to32_prefetch, NO_ALPHA | COPY_ALPHA | SET_ALPHA}, BLIT_FEATURE_HAS_ALTIVEC, ConvertAltivec32to32_prefetch, NO_ALPHA | COPY_ALPHA | SET_ALPHA},
/* has-altivec */ /* has-altivec */
{0x00000000, 0x00000000, 0x00000000, 2, 0x0000F800, 0x000007E0, 0x0000001F, {0x00000000, 0x00000000, 0x00000000, 2, 0x0000F800, 0x000007E0, 0x0000001F,
2, Blit_RGB888_RGB565Altivec, NO_ALPHA}, BLIT_FEATURE_HAS_ALTIVEC, Blit_RGB888_RGB565Altivec, NO_ALPHA},
#endif #endif
/* 4->3 with same rgb triplet */ /* 4->3 with same rgb triplet */
{0x000000FF, 0x0000FF00, 0x00FF0000, 3, 0x000000FF, 0x0000FF00, 0x00FF0000, {0x000000FF, 0x0000FF00, 0x00FF0000, 3, 0x000000FF, 0x0000FF00, 0x00FF0000,