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Code Issues 156 Wiki Activity

Add sky light, physical atmosphere, auto exposure and bloom to the GL 4.6 renderer

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Hirek
2026-10-15 22:16:41 +02:00
parent ea0dba6dae
commit ce725c3d62
37 changed files with 2342 additions and 32 deletions
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30
shaders/light_common.glsl
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@@ -308,12 +308,39 @@ vec3 material_diffuse()
return (value > 0.0 ? diffusecolor * (param[1].x / value) : vec3(0.0));
}
// directional part of the sky ambient light (sky_ssbo, bands 1 and 2 of the spherical harmonics) for a world space direction
vec3 sky_ambient_directional(vec3 n)
{
return sky_ambient_sh[1].rgb * (0.488603 * n.y)
+ sky_ambient_sh[2].rgb * (0.488603 * n.z)
+ sky_ambient_sh[3].rgb * (0.488603 * n.x)
+ sky_ambient_sh[4].rgb * (1.092548 * n.x * n.y)
+ sky_ambient_sh[5].rgb * (1.092548 * n.y * n.z)
+ sky_ambient_sh[6].rgb * (0.315392 * (3.0 * n.z * n.z - 1.0))
+ sky_ambient_sh[7].rgb * (1.092548 * n.x * n.z)
+ sky_ambient_sh[8].rgb * (0.546274 * (n.x * n.x - n.y * n.y));
}
// adds the directional part of the sky light to the ambient light the material starts from (the uniform ambient, or a share
// of it, like the water takes). the same share of the directional part is added, so with the directional part at zero
// (gfx.ambient.sh off) the result is what it always was
vec3 add_sky_ambient(vec3 basecolor, vec3 fragnormal)
{
if (sky_ambient_factor == 0.0)
return basecolor;
float share = dot(basecolor, vec3(1.0)) / max(dot(ambient, vec3(1.0)), 1e-4);
vec3 worldnormal = normalize(mat3(inv_view) * fragnormal);
return max(basecolor + sky_ambient_directional(worldnormal) * (sky_ambient_factor * share), vec3(0.0));
}
// [0] - diffuse, [1] - specular
// do magic here
vec3 apply_lights(vec3 fragcolor, vec3 fragnormal, vec3 texturecolor, float reflectivity, float specularity, float shadowtone)
{
// Diffuse colour is applied once, to the albedo; the light terms below are not scaled by it again
texturecolor *= material_diffuse();
// the sky lights the faces turned up and towards the bright part of the sky more than the ones turned to the ground
fragcolor = add_sky_ambient(fragcolor, fragnormal);
// Scale ambient before it gets tinted by the texture.
// Sun, headlights and emission are added afterwards so they are NOT
// attenuated by AMBIENT_SCALE - this only dims the indirect term.
@@ -326,9 +353,8 @@ vec3 apply_lights(vec3 fragcolor, vec3 fragnormal, vec3 texturecolor, float refl
vec3 F0 = mix(vec3(0.04), texturecolor, metalic);
vec3 fresnel = F0 + (1.0 - F0) * pow(1.0 - NdotV, 5.0);
const float MAX_REFLECTION_LOD = 8.0;
float env_roughness = 1.0 - clamp(glossiness / max(abs(param[1].w), 1.0), 0.0, 1.0);
vec3 envcolor = envmap_color_lod(fragnormal, env_roughness * MAX_REFLECTION_LOD);
vec3 envcolor = envmap_color_rough(fragnormal, env_roughness);
// Pre-integrated env BRDF: roughness/F0/view-dependent specular scale.
// Replaces the old raw `fresnel` weighting so matte surfaces stop