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Merge pull request #85 from jdgleaver/frame-mix-fast 

Optimise interframe blending
This commit is contained in:
Autechre 2020-11-09 14:44:58 +01:00 committed by GitHub
parent c54a3bf21c 908be08be5
commit aad3dbb0b4
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 10 additions and 31 deletions
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41
libretro.c
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@ -279,25 +279,13 @@ static void video_post_process_mix(void)
uint16_t rgb_curr = *(src_curr + x);
uint16_t rgb_prev = *(src_prev + x);
uint16_t r_curr = rgb_curr >> 11 & 0x1F;
uint16_t g_curr = rgb_curr >> 6 & 0x1F;
uint16_t b_curr = rgb_curr & 0x1F;
uint16_t r_prev = rgb_prev >> 11 & 0x1F;
uint16_t g_prev = rgb_prev >> 6 & 0x1F;
uint16_t b_prev = rgb_prev & 0x1F;
/* Store colours for next frame */
*(src_prev + x) = rgb_curr;
/* Mix colours */
uint16_t r_mix = (r_curr >> 1) + (r_prev >> 1) + (((r_curr & 0x1) + (r_prev & 0x1)) >> 1);
uint16_t g_mix = (g_curr >> 1) + (g_prev >> 1) + (((g_curr & 0x1) + (g_prev & 0x1)) >> 1);
uint16_t b_mix = (b_curr >> 1) + (b_prev >> 1) + (((b_curr & 0x1) + (b_prev & 0x1)) >> 1);
/* Convert back to RGB565 and assign
* to current frame */
*(dst + x) = r_mix << 11 | g_mix << 6 | b_mix;
/* Mix colours
* > "Mixing Packed RGB Pixels Efficiently"
* http://blargg.8bitalley.com/info/rgb_mixing.html */
*(dst + x) = (rgb_curr + rgb_prev + ((rgb_curr ^ rgb_prev) & 0x821)) >> 1;
}
src_curr += GBA_SCREEN_PITCH;
@ -321,25 +309,16 @@ static void video_post_process_cc_mix(void)
uint16_t rgb_curr = *(src_curr + x);
uint16_t rgb_prev = *(src_prev + x);
uint16_t r_curr = rgb_curr >> 11 & 0x1F;
uint16_t g_curr = rgb_curr >> 6 & 0x1F;
uint16_t b_curr = rgb_curr & 0x1F;
uint16_t r_prev = rgb_prev >> 11 & 0x1F;
uint16_t g_prev = rgb_prev >> 6 & 0x1F;
uint16_t b_prev = rgb_prev & 0x1F;
/* Store colours for next frame */
*(src_prev + x) = rgb_curr;
/* Mix colours */
uint16_t r_mix = (r_curr >> 1) + (r_prev >> 1) + (((r_curr & 0x1) + (r_prev & 0x1)) >> 1);
uint16_t g_mix = (g_curr >> 1) + (g_prev >> 1) + (((g_curr & 0x1) + (g_prev & 0x1)) >> 1);
uint16_t b_mix = (b_curr >> 1) + (b_prev >> 1) + (((b_curr & 0x1) + (b_prev & 0x1)) >> 1);
/* Mix colours
* > "Mixing Packed RGB Pixels Efficiently"
* http://blargg.8bitalley.com/info/rgb_mixing.html */
uint16_t rgb_mix = (rgb_curr + rgb_prev + ((rgb_curr ^ rgb_prev) & 0x821)) >> 1;
/* Convert colour to RGB555, perform lookup
* and assign to current frame */
*(dst + x) = *(gba_cc_lut + (r_mix << 10 | g_mix << 5 | b_mix));
/* Convert colour to RGB555 and perform lookup */
*(dst + x) = *(gba_cc_lut + (((rgb_mix & 0xFFC0) >> 1) | (rgb_mix & 0x1F)));
}
src_curr += GBA_SCREEN_PITCH;