mirror of
https://github.com/ZDoom/gzdoom.git
synced 2024-11-17 09:51:26 +00:00
52 lines
1.7 KiB
GLSL
52 lines
1.7 KiB
GLSL
// Fuzz effect as rendered by the software renderer
|
|
uniform float timer;
|
|
|
|
#define FUZZTABLE 50
|
|
#define FUZZ_RANDOM_X_SIZE 100
|
|
#define FRACBITS 16
|
|
#define fixed_t int
|
|
|
|
int fuzz_random_x_offset[FUZZ_RANDOM_X_SIZE] = int[]
|
|
(
|
|
75, 76, 21, 91, 56, 33, 62, 99, 61, 79,
|
|
95, 54, 41, 18, 69, 43, 49, 59, 10, 84,
|
|
94, 17, 57, 46, 9, 39, 55, 34,100, 81,
|
|
73, 88, 92, 3, 63, 36, 7, 28, 13, 80,
|
|
16, 96, 78, 29, 71, 58, 89, 24, 1, 35,
|
|
52, 82, 4, 14, 22, 53, 38, 66, 12, 72,
|
|
90, 44, 77, 83, 6, 27, 48, 30, 42, 32,
|
|
65, 15, 97, 20, 67, 74, 98, 85, 60, 68,
|
|
19, 26, 8, 87, 86, 64, 11, 37, 31, 47,
|
|
25, 5, 50, 51, 23, 2, 93, 70, 40, 45
|
|
);
|
|
|
|
int fuzzoffset[FUZZTABLE] = int[]
|
|
(
|
|
6, 11, 6, 11, 6, 6, 11, 6, 6, 11,
|
|
6, 6, 6, 11, 6, 6, 6, 11, 15, 18,
|
|
21, 6, 11, 15, 6, 6, 6, 6, 11, 6,
|
|
11, 6, 6, 11, 15, 6, 6, 11, 15, 18,
|
|
21, 6, 6, 6, 6, 11, 6, 6, 11, 6
|
|
);
|
|
|
|
vec4 ProcessTexel()
|
|
{
|
|
vec2 texCoord = vTexCoord.st;
|
|
vec4 basicColor = getTexel(texCoord);
|
|
|
|
// Ideally fuzzpos would be an uniform and differ from each sprite so that overlapping demons won't get the same shade for the same pixel
|
|
int next_random = int(abs(mod(timer * 35.0, float(FUZZ_RANDOM_X_SIZE))));
|
|
int fuzzpos = (/*fuzzpos +*/ fuzz_random_x_offset[next_random] * FUZZTABLE / 100) % FUZZTABLE;
|
|
|
|
int x = int(gl_FragCoord.x);
|
|
int y = int(gl_FragCoord.y);
|
|
|
|
fixed_t fuzzscale = (200 << FRACBITS) / uViewHeight;
|
|
int scaled_x = (x * fuzzscale) >> FRACBITS;
|
|
int fuzz_x = fuzz_random_x_offset[scaled_x % FUZZ_RANDOM_X_SIZE] + fuzzpos;
|
|
fixed_t fuzzcount = FUZZTABLE << FRACBITS;
|
|
fixed_t fuzz = ((fuzz_x << FRACBITS) + y * fuzzscale) % fuzzcount;
|
|
float alpha = float(fuzzoffset[fuzz >> FRACBITS]) / 32.0;
|
|
|
|
return vec4(0.0, 0.0, 0.0, basicColor.a * alpha);
|
|
}
|