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2k skybox tex; trilinear blending of atmos vars

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minjaesong
2023-08-07 13:57:58 +09:00
parent 30fb57eca3
commit 014306c209
6 changed files with 126 additions and 46 deletions
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41
src/shaders/blendSkyboxStars.frag
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@@ -14,9 +14,15 @@ out vec4 fragColor;
const vec2 boolean = vec2(0.0, 1.0);
uniform vec4 drawOffsetSize; // (gradX, gradY, gradW, gradH)
uniform vec4 skyboxUV1; // (u, v, u2, v2) for the skybox drawing (morning)
uniform vec4 skyboxUV2; // (u, v, u2, v2) for the skybox drawing (afternoon)
uniform float texBlend;
uniform vec4 uvA; // (u, v, u2, v2) for morn, turbLow, albLow
uniform vec4 uvB; // (u, v, u2, v2) for noon, turbLow, albLow
uniform vec4 uvC; // (u, v, u2, v2) for morn, turbHigh, albLow
uniform vec4 uvD; // (u, v, u2, v2) for noon, turbHigh, albLow
uniform vec4 uvE; // (u, v, u2, v2) for morn, turbLow, albHigh
uniform vec4 uvF; // (u, v, u2, v2) for noon, turbLow, albHigh
uniform vec4 uvG; // (u, v, u2, v2) for morn, turbHigh, albHigh
uniform vec4 uvH; // (u, v, u2, v2) for noon, turbHigh, albHigh
uniform vec4 texBlend; // (morn/noon, turbidity, albedo, unused)
uniform vec2 tex1Size = vec2(4096.0);
uniform vec2 astrumScroll = vec2(0.0);
uniform vec4 randomNumber = vec4(1.0, -2.0, 3.0, -4.0);
@@ -112,19 +118,36 @@ vec4 random(vec2 p) {
// draw call to this function must use UV coord of (0,0,1,1)!
void main(void) {
vec2 skyboxTexCoordMorning = mix(skyboxUV1.xy, skyboxUV1.zw, v_texCoords);
vec2 skyboxTexCoordAfternoon = mix(skyboxUV2.xy, skyboxUV2.zw, v_texCoords);
vec4 colorTexA = texture(u_texture, mix(uvA.xy, uvA.zw, v_texCoords));
vec4 colorTexB = texture(u_texture, mix(uvB.xy, uvB.zw, v_texCoords));
vec4 colorTexC = texture(u_texture, mix(uvC.xy, uvC.zw, v_texCoords));
vec4 colorTexD = texture(u_texture, mix(uvD.xy, uvD.zw, v_texCoords));
vec4 colorTexE = texture(u_texture, mix(uvE.xy, uvE.zw, v_texCoords));
vec4 colorTexF = texture(u_texture, mix(uvF.xy, uvF.zw, v_texCoords));
vec4 colorTexG = texture(u_texture, mix(uvG.xy, uvG.zw, v_texCoords));
vec4 colorTexH = texture(u_texture, mix(uvH.xy, uvH.zw, v_texCoords));
vec2 astrumTexCoord = (v_texCoords * drawOffsetSize.zw + drawOffsetSize.xy + astrumScroll) / tex1Size;
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 colorTex0Morining = texture(u_texture, skyboxTexCoordMorning);
vec4 colorTex0Afternoon = texture(u_texture, skyboxTexCoordAfternoon);
vec4 colorTex0 = mix(colorTex0Morining, colorTex0Afternoon, texBlend);
vec4 colorTex1 = texture(tex1, astrumTexCoord) * randomness;
// notations used: https://en.wikipedia.org/wiki/File:Enclosing_points.svg and https://en.wikipedia.org/wiki/File:3D_interpolation2.svg
vec4 colorTex0 = mix(
mix(
mix(colorTexA, colorTexE, texBlend.z), // c00 = c000..c100
mix(colorTexC, colorTexG, texBlend.z), // c10 = c010..c110
texBlend.y
), // c0 = c00..c10
mix(
mix(colorTexB, colorTexF, texBlend.z), // c01 = c001..c101
mix(colorTexD, colorTexH, texBlend.z), // c11 = c011..c111
texBlend.y
), // c1 = c01..c11
texBlend.x
); // c = c0..c1
fragColor = (max(colorTex0, colorTex1) * boolean.yyyx) + boolean.xxxy;