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More snowflakes

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This commit is contained in:
Luke Wren 2021-12-25 09:47:31 +00:00
parent 6a550ffd52
commit 5123727143
4 changed files with 2061 additions and 2054 deletions
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13
software/apps/christmas_snowflakes/main.c
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@ -20,7 +20,7 @@
#define SNOWFLAKE_SIZE 64
#define N_SNOWFLAKE_IMAGES 8
#define N_SPRITES 9
#define N_SPRITES 18
#define RED_MASK 0xf800u
#define GREEN_MASK 0x07e0u
@ -55,12 +55,14 @@ static inline uint16_t rgb565_lerp(uint32_t c0, uint32_t c1, uint alpha) {
}
static inline uint16_t rgb565_lerp_white(uint32_t c0, uint alpha) {
alpha = 256 - alpha;
// Note alpha is preinverted (or you can think of this as "lerp from white")
alpha += 1;
// Since alpha is only 6 bits, we can combine the red and blue operations
// into 1, since the zeroes in the green region break the carries.
c0 = ~c0;
c0 =
(((c0 & RED_MASK ) * alpha >> 8) & RED_MASK ) |
(((c0 & GREEN_MASK) * alpha >> 8) & GREEN_MASK) |
(((c0 & BLUE_MASK ) * alpha >> 8) & BLUE_MASK );
(((c0 & (RED_MASK | BLUE_MASK)) * alpha >> 6) & (RED_MASK | BLUE_MASK)) |
(((c0 & GREEN_MASK ) * alpha >> 6) & GREEN_MASK );
return ~c0;
}
@ -122,6 +124,7 @@ void __scratch_x("render") render_scanline(uint16_t *scanbuf, uint raster_y) {
if (i >= SNOWFLAKE_SIZE)
continue;
#pragma GCC unroll 8
for (int j = 0; j < SNOWFLAKE_SIZE; ++j) {
int x = (int)sprites[s].x + j;
if (x < 0)

4096
software/assets/snowflakes.h generated
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software/assets/snowflakes.png
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6
software/scripts/packtiles
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@ -6,7 +6,10 @@ import os
import struct
import sys
FORMATS = ["argb1555", "rgab5515", "bgar5515", "rgb565", "argb1232", "ragb2132", "rgb332", "r8", "r2", "r1", "p8", "p4", "p2", "p1"]
FORMATS = [
"argb1555", "rgab5515", "bgar5515", "rgb565", "argb1232", "ragb2132", "rgb332",
"r8", "r6", "r2", "r1", "p8", "p4", "p2", "p1"
]
def bytes_from_bitstream_le(bitstream):
accum = 0
@ -86,6 +89,7 @@ rgb_formats = {
"ragb2132": (8, ((7, 6), (4, 2), (1, 0), (5, 5))),
"rgb332" : (8, ((7, 5), (4, 2), (1, 0))),
"r8" : (8, ((7, 0), (-1, 0), (-1, 0))),
"r6" : (8, ((5, 0), (-1, 0), (-1, 0))),
"r2" : (2, ((1, 0), (-1, 0), (-1, 0))),
"r1" : (1, ((0, 0), (-1, 0), (-1, 0))),
}