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stars: more realistic twinkle, change of axial tilt changes starmap 'altitude'

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This commit is contained in:
minjaesong
2023-08-03 23:55:19 +09:00
parent c73461a407
commit 385a882937
3 changed files with 25 additions and 9 deletions
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13
src/shaders/blendSkyboxStars.frag
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@@ -19,7 +19,7 @@ uniform vec2 skyboxUV1; // (u, v) for the skybox drawing
uniform vec2 skyboxUV2; // (u2, v2) for the skybox drawing
uniform vec2 tex1Size = vec2(4096.0);
uniform vec2 astrumScroll = vec2(0.0);
uniform vec4 randomNumber = vec4(0.0);
uniform vec4 randomNumber = vec4(1.0, -2.0, 3.0, -4.0);
vec3 mod289(vec3 x) {
return x - floor(x * (1.0 / 289.0)) * 289.0;
@@ -83,11 +83,17 @@ float snoise(vec2 v)
}
vec4 snoise4(vec2 v) {
return vec4(
/*return vec4(
(snoise(v + randomNumber.xy) + snoise(v + randomNumber.zx)) * 0.5,
(snoise(v + randomNumber.zw) + snoise(v + randomNumber.yw)) * 0.5,
(snoise(v + randomNumber.xz) + snoise(v + randomNumber.yx)) * 0.5,
(snoise(v + randomNumber.yw) + snoise(v + randomNumber.wz)) * 0.5 // triangular distribution
);*/
return vec4(
(snoise(v + randomNumber.xy) + snoise(v + randomNumber.zx) + snoise(v + randomNumber.zw) + snoise(v + randomNumber.yw)) * 0.25,
(snoise(v + randomNumber.zw) + snoise(v + randomNumber.yw) + snoise(v + randomNumber.xz) + snoise(v + randomNumber.yx)) * 0.25,
(snoise(v + randomNumber.xz) + snoise(v + randomNumber.yx) + snoise(v + randomNumber.yw) + snoise(v + randomNumber.wz)) * 0.25,
(snoise(v + randomNumber.yw) + snoise(v + randomNumber.wz) + snoise(v + randomNumber.xy) + snoise(v + randomNumber.zx)) * 0.25
);
}
@@ -109,7 +115,7 @@ void main(void) {
vec2 skyboxTexCoord = mix(skyboxUV1, skyboxUV2, v_texCoords);
vec2 astrumTexCoord = (v_texCoords * drawOffsetSize + drawOffset + astrumScroll) / tex1Size;
vec4 randomness = snoise4(gl_FragCoord.xy * 0.16) * 2.0; // multiply by 2 so that the "density" of the stars would be same as the non-random version
vec4 randomness = snoise4((gl_FragCoord.xy - astrumScroll) * 0.16) * 2.0; // multiply by 2 so that the "density" of the stars would be same as the non-random version
vec4 colorTex0 = texture(u_texture, skyboxTexCoord);
@@ -120,4 +126,5 @@ void main(void) {
fragColor = (max(colorTex0, colorTex1) * boolean.yyyx) + boolean.xxxy;
// fragColor = colorTex1;
// fragColor = randomness * boolean.yyyx + boolean.xxxy;
// fragColor = (randomness.rrrr + (colorTex1 * vec4(2.0, -2.0, 2.0, 1.0))) * boolean.yyyx + boolean.xxxy;
}