diff options
| author | Vito Caputo <vcaputo@pengaru.com> | 2022-12-18 14:24:08 -0800 |
|---|---|---|
| committer | Vito Caputo <vcaputo@pengaru.com> | 2022-12-18 15:03:58 -0800 |
| commit | fb6800db0b82acb62da281a56f596f8866f31746 (patch) | |
| tree | ccbca15fec77e393813dab328ab5beef38d4f6dc /src/plasma-node.c | |
| parent | fd2f60fc3ae64408a82259f5bd8351fc53f27bb0 (diff) | |
plasma-node: add stars to MAGA plasma mode
Until now the red/white/blue plasma was somewhat ambiguous WRT
french/russian flags. This commit adds white stars to the blue.
Diffstat (limited to 'src/plasma-node.c')
| -rw-r--r-- | src/plasma-node.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/src/plasma-node.c b/src/plasma-node.c index 27100cf..c026923 100644 --- a/src/plasma-node.c +++ b/src/plasma-node.c @@ -76,6 +76,25 @@ static const char *plasma_fs = "" "uniform float gloom;" "uniform int maga;" +" float dostar(vec2 uv, float size) {" +" uv.x = abs(uv.x);" +" float a = 6.2832/5.;" +" float d1 = dot(uv, vec2(sin(a), cos(a)));" +" a = 3. * 6.2832/5.;" +" float d2 = dot(uv, vec2(sin(a), cos(a)));" +" a = 2. * 6.2832/5.;" +" float d4 = dot(uv, vec2(sin(a), cos(a)));" +" float d = min(max(d1, d2), max(uv.y, d4));" +#ifdef __EMSCRIPTEN__ + /* GLSL 1.0 lacks fwidth() */ +" float w = .001;" +#else +" float w = fwidth(d);" +#endif + +" return smoothstep(w, -w, d - size);" +" }" + "void main() {" " float v;" " float stime = sin(time * .01) * 100.0;" @@ -85,6 +104,7 @@ static const char *plasma_fs = "" #else " vec2 c = gl_TexCoord[0].st;" #endif + " vec2 cc = c;" // this zooms the texture coords in and out a bit with time " c *= (sin(stime * .01) *.5 + .5) * 3.0 + 1.0;" @@ -100,12 +120,14 @@ static const char *plasma_fs = "" " if (maga == 1) {" " float r, g, b;" - - " r = smoothstep(.25, .8, cos(PI * v + sin(time)));" - " g = smoothstep(.25, .8, cos(1.333 * PI + PI * v + sin(time)));" + " float star = dostar(mod(cc, .2) - .1, (sin(time + c.x + c.y) * .5 + .5) * .01 + .01);" " b = smoothstep(.25, .8, cos(2.666 * PI + PI * v + sin(time)));" + " star *= b;" + " b = max(star, b);" + " r = max(smoothstep(.25, .8, cos(PI * v + sin(time))), star);" + " g = max(smoothstep(.25, .8, cos(1.333 * PI + PI * v + sin(time))), star);" - " gl_FragColor = vec4(r + g, g, b + g, 1.);" + " gl_FragColor = vec4(max(r, g), g, max(b, g), 1.);" " } else {" " vec3 col = vec3(cos(PI * v + sin(time)), sin(PI * v + cos(time * .33)), cos(PI * v + sin(time * .66)));" " gl_FragColor = vec4((col * .5 + .5), 1.);" |