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333 lines
17 KiB
GLSL
333 lines
17 KiB
GLSL
#version 330 core
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#include <constants.glsl>
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#define LIGHTING_TYPE (LIGHTING_TYPE_TRANSMISSION | LIGHTING_TYPE_REFLECTION)
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#define LIGHTING_REFLECTION_KIND LIGHTING_REFLECTION_KIND_SPECULAR
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#if (FLUID_MODE == FLUID_MODE_CHEAP)
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#define LIGHTING_TRANSPORT_MODE LIGHTING_TRANSPORT_MODE_IMPORTANCE
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#elif (FLUID_MODE == FLUID_MODE_SHINY)
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#define LIGHTING_TRANSPORT_MODE LIGHTING_TRANSPORT_MODE_RADIANCE
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#endif
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#define LIGHTING_DISTRIBUTION_SCHEME LIGHTING_DISTRIBUTION_SCHEME_MICROFACET
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#define LIGHTING_DISTRIBUTION LIGHTING_DISTRIBUTION_BECKMANN
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#define HAS_SHADOW_MAPS
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// https://www.shadertoy.com/view/XdsyWf
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#include <globals.glsl>
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#include <random.glsl>
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in vec3 f_pos;
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flat in uint f_pos_norm;
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// in vec3 f_col;
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// in float f_light;
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// in vec3 light_pos[2];
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//struct ShadowLocals {
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// mat4 shadowMatrices;
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// mat4 texture_mat;
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//};
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//
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//layout (std140)
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//uniform u_light_shadows {
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// ShadowLocals shadowMats[/*MAX_LAYER_FACES*/192];
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//};
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layout (std140)
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uniform u_locals {
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vec3 model_offs;
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float load_time;
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ivec4 atlas_offs;
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};
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uniform sampler2D t_waves;
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out vec4 tgt_color;
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#include <cloud.glsl>
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#include <light.glsl>
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#include <lod.glsl>
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vec3 warp_normal(vec3 norm, vec3 pos, float time) {
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return normalize(norm
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+ smooth_rand(pos * 1.0, time * 1.0) * 0.05
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+ smooth_rand(pos * 0.25, time * 0.25) * 0.1);
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}
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float wave_height(vec3 pos) {
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float timer = tick.x * 0.75;
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pos *= 0.5;
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vec3 big_warp = (
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texture(t_waves, fract(pos.xy * 0.03 + timer * 0.01)).xyz * 0.5 +
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texture(t_waves, fract(pos.yx * 0.03 - timer * 0.01)).xyz * 0.5 +
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vec3(0)
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);
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vec3 warp = (
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texture(t_noise, fract(pos.yx * 0.1 + timer * 0.02)).xyz * 0.3 +
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texture(t_noise, fract(pos.yx * 0.1 - timer * 0.02)).xyz * 0.3 +
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vec3(0)
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);
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float height = (
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(texture(t_noise, (pos.xy + pos.z) * 0.03 + big_warp.xy + timer * 0.05).y - 0.5) * 1.0 +
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(texture(t_noise, (pos.yx + pos.z) * 0.03 + big_warp.yx - timer * 0.05).y - 0.5) * 1.0 +
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(texture(t_waves, (pos.xy + pos.z) * 0.1 + warp.xy + timer * 0.1).x - 0.5) * 0.5 +
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(texture(t_waves, (pos.yx + pos.z) * 0.1 + warp.yx - timer * 0.1).x - 0.5) * 0.5 +
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(texture(t_noise, (pos.yx + pos.z) * 0.3 + warp.xy * 0.5 + timer * 0.1).x - 0.5) * 0.2 +
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(texture(t_noise, (pos.xy + pos.z) * 0.3 + warp.yx * 0.5 - timer * 0.1).x - 0.5) * 0.2 +
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(texture(t_noise, (pos.yx + pos.z) * 1.0 + warp.yx * 0.0 - timer * 0.1).x - 0.5) * 0.05 +
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0.0
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);
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return pow(abs(height), 0.5) * sign(height) * 15.0;
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}
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void main() {
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// First 3 normals are negative, next 3 are positive
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vec3 normals[6] = vec3[](vec3(-1,0,0), vec3(1,0,0), vec3(0,-1,0), vec3(0,1,0), vec3(0,0,-1), vec3(0,0,1));
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// TODO: last 3 bits in v_pos_norm should be a number between 0 and 5, rather than 0-2 and a direction.
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uint norm_axis = (f_pos_norm >> 30) & 0x3u;
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// Increase array access by 3 to access positive values
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uint norm_dir = ((f_pos_norm >> 29) & 0x1u) * 3u;
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// Use an array to avoid conditional branching
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// Temporarily assume all water faces up (this is incorrect but looks better)
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vec3 f_norm = vec3(0, 0, 1);//normals[norm_axis + norm_dir];
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vec3 cam_to_frag = normalize(f_pos - cam_pos.xyz);
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// vec4 light_pos[2];
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//#if (SHADOW_MODE == SHADOW_MODE_MAP)
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// // for (uint i = 0u; i < light_shadow_count.z; ++i) {
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// // light_pos[i] = /*vec3(*/shadowMats[i].texture_mat * vec4(f_pos, 1.0)/*)*/;
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// // }
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// vec4 sun_pos = /*vec3(*/shadowMats[0].texture_mat * vec4(f_pos, 1.0)/*)*/;
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//#elif (SHADOW_MODE == SHADOW_MODE_CHEAP || SHADOW_MODE == SHADOW_MODE_NONE)
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// vec4 sun_pos = vec4(0.0);
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//#endif
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// vec4 vert_pos4 = view_mat * vec4(f_pos, 1.0);
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// vec3 view_dir = normalize(-vec3(vert_pos4)/* / vert_pos4.w*/);
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vec3 view_dir = -cam_to_frag;
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float frag_dist = length(f_pos - cam_pos.xyz);
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vec3 b_norm;
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if (f_norm.z > 0.0) {
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b_norm = vec3(1, 0, 0);
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} else if (f_norm.x > 0.0) {
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b_norm = vec3(0, 1, 0);
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} else {
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b_norm = vec3(0, 0, 1);
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}
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vec3 c_norm = cross(f_norm, b_norm);
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vec3 wave_pos = f_pos + focus_off.xyz;
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float wave00 = wave_height(wave_pos);
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float wave10 = wave_height(wave_pos + vec3(0.1, 0, 0));
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float wave01 = wave_height(wave_pos + vec3(0, 0.1, 0));
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// Possibility of div by zero when slope = 0,
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// however this only results in no water surface appearing
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// and is not likely to occur (could not find any occurrences)
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float slope = abs((wave00 - wave10) * (wave00 - wave01)) + 0.001;
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vec3 nmap = vec3(
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-(wave10 - wave00) / 0.1,
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-(wave01 - wave00) / 0.1,
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0.1 / slope
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);
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nmap = mix(f_norm, normalize(nmap), min(1.0 / pow(frag_dist, 0.75), 1));
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//float suppress_waves = max(dot(), 0);
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vec3 norm = vec3(0, 0, 1) * nmap.z + b_norm * nmap.x + c_norm * nmap.y;
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// vec3 norm = f_norm;
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vec3 water_color = (1.0 - MU_WATER) * MU_SCATTER;
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#if (SHADOW_MODE == SHADOW_MODE_CHEAP || SHADOW_MODE == SHADOW_MODE_MAP || FLUID_MODE == FLUID_MODE_SHINY)
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float f_alt = alt_at(f_pos.xy);
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#elif (SHADOW_MODE == SHADOW_MODE_NONE || FLUID_MODE == FLUID_MODE_CHEAP)
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float f_alt = f_pos.z;
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#endif
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float fluid_alt = mix(f_pos.z, f_alt, f_norm.z == 0);
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const float alpha = 0.255/*/ / 4.0*//* / 4.0 / sqrt(2.0)*/;
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const float n2 = 1.3325;
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const float R_s2s0 = pow((1.0 - n2) / (1.0 + n2), 2);
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const float R_s1s0 = pow((1.3325 - n2) / (1.3325 + n2), 2);
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const float R_s2s1 = pow((1.0 - 1.3325) / (1.0 + 1.3325), 2);
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const float R_s1s2 = pow((1.3325 - 1.0) / (1.3325 + 1.0), 2);
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float R_s = (f_pos.z < fluid_alt) ? mix(R_s2s1 * R_s1s0, R_s1s0, medium.x) : mix(R_s2s0, R_s1s2 * R_s2s0, medium.x);
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// Water is transparent so both normals are valid.
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vec3 cam_norm = faceforward(norm, norm, cam_to_frag);
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vec3 reflect_ray_dir = reflect(cam_to_frag/*-view_dir*/, norm);
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vec3 refract_ray_dir = refract(cam_to_frag/*-view_dir*/, norm, 1.0 / n2);
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vec3 sun_view_dir = view_dir;///*sign(cam_pos.z - fluid_alt) * view_dir;*/cam_pos.z <= fluid_alt ? -view_dir : view_dir;
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// vec3 sun_view_dir = cam_pos.z <= fluid_alt ? -view_dir : view_dir;
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vec3 beam_view_dir = reflect_ray_dir;//cam_pos.z <= fluid_alt ? -refract_ray_dir : reflect_ray_dir;
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/* vec4 reflect_ray_dir4 = view_mat * vec4(reflect_ray_dir, 1.0);
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reflect_ray_dir = normalize(vec3(reflect_ray_dir4) / reflect_ray_dir4.w); */
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// vec3 cam_to_frag = normalize(f_pos - cam_pos.xyz);
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// Squared to account for prior saturation.
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float f_light = 1.0;// pow(f_light, 1.5);
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vec3 reflect_color = get_sky_color(/*reflect_ray_dir*/beam_view_dir, time_of_day.x, f_pos, vec3(-100000), 0.125, true);
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reflect_color = get_cloud_color(reflect_color, reflect_ray_dir, cam_pos.xyz, time_of_day.x, 100000.0, 0.1);
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reflect_color *= f_light;
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// /*const */vec3 water_color = srgb_to_linear(vec3(0.2, 0.5, 1.0));
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// /*const */vec3 water_color = srgb_to_linear(vec3(0.8, 0.9, 1.0));
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// NOTE: Linear RGB, attenuation coefficients for water at roughly R, G, B wavelengths.
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// See https://en.wikipedia.org/wiki/Electromagnetic_absorption_by_water
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// /*const */vec3 water_attenuation = MU_WATER;// vec3(0.8, 0.05, 0.01);
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// /*const */vec3 water_color = vec3(0.2, 0.95, 0.99);
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/* vec3 sun_dir = get_sun_dir(time_of_day.x);
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vec3 moon_dir = get_moon_dir(time_of_day.x); */
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#if (SHADOW_MODE == SHADOW_MODE_CHEAP || SHADOW_MODE == SHADOW_MODE_MAP)
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vec4 f_shadow = textureBicubic(t_horizon, pos_to_tex(f_pos.xy));
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float sun_shade_frac = horizon_at2(f_shadow, f_alt, f_pos, sun_dir);
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#elif (SHADOW_MODE == SHADOW_MODE_NONE)
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float sun_shade_frac = 1.0;//horizon_at2(f_shadow, f_alt, f_pos, sun_dir);
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#endif
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float moon_shade_frac = 1.0;// horizon_at2(f_shadow, f_alt, f_pos, moon_dir);
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// float sun_shade_frac = horizon_at(/*f_shadow, f_pos.z, */f_pos, sun_dir);
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// float moon_shade_frac = horizon_at(/*f_shadow, f_pos.z, */f_pos, moon_dir);
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// float shade_frac = /*1.0;*/sun_shade_frac + moon_shade_frac;
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// DirectionalLight sun_info = get_sun_info(sun_dir, sun_shade_frac, light_pos);
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float point_shadow = shadow_at(f_pos, f_norm);
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DirectionalLight sun_info = get_sun_info(sun_dir, point_shadow * sun_shade_frac, /*sun_pos*/f_pos);
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DirectionalLight moon_info = get_moon_info(moon_dir, point_shadow * moon_shade_frac/*, light_pos*/);
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// Hack to determine water depth: color goes down with distance through water, so
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// we assume water color absorption from this point a to some other point b is the distance
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// along the the ray from a to b where it intersects with the surface plane; if it doesn't,
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// then the whole segment from a to b is considered underwater.
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// TODO: Consider doing for point lights.
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// vec3 cam_surface_dir = faceforward(vec3(0.0, 0.0, 1.0), cam_to_frag, vec3(0.0, 0.0, 1.0));
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// vec3 water_intersection_surface_camera = vec3(cam_pos);
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// bool _water_intersects_surface_camera = IntersectRayPlane(f_pos, view_dir, vec3(0.0, 0.0, /*f_alt*/f_pos.z + f_light), cam_surface_dir, water_intersection_surface_camera);
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// // Should work because we set it up so that if IntersectRayPlane returns false for camera, its default intersection point is cam_pos.
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// float water_depth_to_camera = length(water_intersection_surface_camera - f_pos);
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// vec3 water_intersection_surface_light = f_pos;
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// bool _light_intersects_surface_water = IntersectRayPlane(f_pos, sun_dir.z <= 0.0 ? sun_dir : moon_dir, vec3(0.0, 0.0, /*f_alt*/f_pos.z + f_light), vec3(0.0, 0.0, 1.0), water_intersection_surface_light);
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// // Should work because we set it up so that if IntersectRayPlane returns false for light, its default intersection point is f_pos--
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// // i.e. if a light ray can't hit the water, it shouldn't contribute to coloring at all.
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// float water_depth_to_light = length(water_intersection_surface_light - f_pos);
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// // For ambient color, we just take the distance to the surface out of laziness.
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// float water_depth_to_vertical = max(/*f_alt - f_pos.z*/f_light, 0.0);
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// // Color goes down with distance...
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// // See https://en.wikipedia.org/wiki/Beer%E2%80%93Lambert_law.
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// vec3 water_color_direct = exp(-MU_WATER);//exp(-MU_WATER);//vec3(1.0);
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// vec3 water_color_direct = exp(-water_attenuation * (water_depth_to_light + water_depth_to_camera));
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// vec3 water_color_ambient = exp(-water_attenuation * (water_depth_to_vertical + water_depth_to_camera));
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vec3 mu = MU_WATER;
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// NOTE: Default intersection point is camera position, meaning if we fail to intersect we assume the whole camera is in water.
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vec3 cam_attenuation = compute_attenuation_point(f_pos, -view_dir, mu, fluid_alt, cam_pos.xyz);
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// float water_depth_to_vertical = max(/*f_alt - f_pos.z*/f_light, 0.0);
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// For ambient color, we just take the distance to the surface out of laziness.
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// See https://en.wikipedia.org/wiki/Beer%E2%80%93Lambert_law.
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// float water_depth_to_vertical = max(fluid_alt - cam_pos.z/*f_light*/, 0.0);
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// vec3 ambient_attenuation = exp(-mu * water_depth_to_vertical);
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// For ambient reflection, we just take the water
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vec3 k_a = vec3(1.0);
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// Oxygen is light blue.
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vec3 k_d = vec3(/*vec3(0.2, 0.9, 0.99)*/1.0);
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vec3 k_s = vec3(R_s);//2.0 * reflect_color;
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vec3 emitted_light, reflected_light;
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// vec3 light, diffuse_light, ambient_light;
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// vec3 light_frac = /*vec3(1.0);*/light_reflection_factor(f_norm/*vec3(0, 0, 1.0)*/, view_dir, vec3(0, 0, -1.0), vec3(1.0), vec3(R_s), alpha);
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// 0 = 100% reflection, 1 = translucent water
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float passthrough = /*pow(*/dot(faceforward(norm, norm, cam_to_frag/*view_dir*/), -cam_to_frag/*view_dir*/)/*, 0.5)*/;
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float max_light = 0.0;
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max_light += get_sun_diffuse2(sun_info, moon_info, norm, /*time_of_day.x*/sun_view_dir, f_pos, mu, cam_attenuation, fluid_alt, k_a/* * (shade_frac * 0.5 + light_frac * 0.5)*/, vec3(k_d), /*vec3(f_light * point_shadow)*//*reflect_color*/k_s, alpha, f_norm, 1.0, emitted_light, reflected_light);
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// Apply cloud layer to sky
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// reflected_light *= /*water_color_direct * */reflect_color * f_light * point_shadow * shade_frac;
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// emitted_light *= /*water_color_direct*//*ambient_attenuation * */f_light * point_shadow * max(shade_frac, MIN_SHADOW);
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// max_light *= f_light * point_shadow * shade_frac;
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// reflected_light *= /*water_color_direct * */reflect_color * f_light * point_shadow;
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// emitted_light *= /*water_color_direct*//*ambient_attenuation * */f_light * point_shadow;
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// max_light *= f_light * point_shadow;
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// vec3 diffuse_light_point = vec3(0.0);
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// max_light += lights_at(f_pos, cam_norm, view_dir, mu, cam_attenuation, fluid_alt, k_a, vec3(1.0), /*vec3(0.0)*/k_s, alpha, emitted_light, diffuse_light_point);
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// vec3 dump_light = vec3(0.0);
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// vec3 specular_light_point = vec3(0.0);
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// lights_at(f_pos, cam_norm, view_dir, mu, cam_attenuation, fluid_alt, vec3(0.0), vec3(0.0), /*vec3(1.0)*/k_s, alpha, dump_light, specular_light_point);
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// diffuse_light_point -= specular_light_point;
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// max_light += lights_at(f_pos, cam_norm, view_dir, mu, cam_attenuation, fluid_alt, k_a, /*k_d*/vec3(0.0), /*vec3(0.0)*/k_s, alpha, emitted_light, /*diffuse_light*/reflected_light);
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max_light += lights_at(f_pos, cam_norm, view_dir, mu, cam_attenuation, fluid_alt, k_a, /*k_d*//*vec3(0.0)*/k_d, /*vec3(0.0)*/k_s, alpha, f_norm, 1.0, emitted_light, /*diffuse_light*/reflected_light);
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float reflected_light_point = length(reflected_light);///*length*/(diffuse_light_point.r) + f_light * point_shadow;
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// TODO: See if we can be smarter about this using point light distances.
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// reflected_light += k_d * (diffuse_light_point/* + f_light * point_shadow * shade_frac*/) + /*water_color_ambient*/specular_light_point;
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/* vec3 point_light = light_at(f_pos, norm);
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emitted_light += point_light;
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reflected_light += point_light; */
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// get_sun_diffuse(norm, time_of_day.x, light, diffuse_light, ambient_light, 0.0);
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// diffuse_light *= f_light * point_shadow;
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// ambient_light *= f_light * point_shadow;
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// vec3 point_light = light_at(f_pos, norm);
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// light += point_light;
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// diffuse_light += point_light;
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// reflected_light += point_light;
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// vec3 surf_color = srgb_to_linear(vec3(0.2, 0.5, 1.0)) * light * diffuse_light * ambient_light;
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const float REFLECTANCE = 0.5;
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vec3 surf_color = illuminate(max_light, view_dir, water_color * emitted_light/* * log(1.0 - MU_WATER)*/, /*cam_attenuation * *//*water_color * */reflect_color * REFLECTANCE + water_color * reflected_light/* * log(1.0 - MU_WATER)*/);
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// passthrough = pow(passthrough, 1.0 / (1.0 + water_depth_to_camera));
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/* surf_color = cam_attenuation.g < 0.5 ?
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vec3(1.0, 0.0, 0.0) :
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vec3(0.0, 1.0, 1.0)
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; */
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// passthrough = passthrough * length(cam_attenuation);
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// vec3 reflect_ray_dir = reflect(cam_to_frag, norm);
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// Hack to prevent the reflection ray dipping below the horizon and creating weird blue spots in the water
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// reflect_ray_dir.z = max(reflect_ray_dir.z, 0.01);
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// vec4 _clouds;
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// vec3 reflect_color = get_sky_color(reflect_ray_dir, time_of_day.x, f_pos, vec3(-100000), 0.25, false, _clouds) * f_light;
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// Tint
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// reflect_color = mix(reflect_color, surf_color, 0.6);
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// vec4 color = mix(vec4(reflect_color * 2.0, 1.0), vec4(surf_color, 1.0 / (1.0 + /*diffuse_light*/(f_light * point_shadow + point_light) * 0.25)), passthrough);
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// vec4 color = mix(vec4(reflect_color * 2.0, 1.0), vec4(surf_color, 1.0 / (1.0 + /*diffuse_light*/(/*f_light * point_shadow*/f_light * point_shadow + reflected_light_point/* + point_light*//*reflected_light*/) * 0.25)), passthrough);
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// vec4 color = mix(vec4(surf_color, 1.0), vec4(surf_color, 0.0), passthrough);
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//vec4 color = vec4(surf_color, 1.0);
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// vec4 color = mix(vec4(reflect_color, 1.0), vec4(surf_color, 1.0 / (1.0 + /*diffuse_light*/(/*f_light * point_shadow*/reflected_light_point/* + point_light*//*reflected_light*/))), passthrough);
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// float log_cam = log(min(cam_attenuation.r, min(cam_attenuation.g, cam_attenuation.b)));
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float min_refl = min(emitted_light.r, min(emitted_light.g, emitted_light.b));
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vec4 color = vec4(surf_color, (1.0 - passthrough) * 1.0 / (1.0 + min_refl));// * (1.0 - /*log(1.0 + cam_attenuation)*//*cam_attenuation*/1.0 / (2.0 - log_cam)));
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// vec4 color = vec4(surf_color, mix(1.0, 1.0 / (1.0 + /*0.25 * *//*diffuse_light*/(/*f_light * point_shadow*/reflected_light_point)), passthrough));
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// vec4 color = vec4(surf_color, mix(1.0, length(cam_attenuation), passthrough));
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/* reflect_color = reflect_color * 0.5 * (diffuse_light + ambient_light);
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// 0 = 100% reflection, 1 = translucent water
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float passthrough = dot(faceforward(f_norm, f_norm, cam_to_frag), -cam_to_frag);
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vec4 color = mix(vec4(reflect_color, 1.0), vec4(vec3(0), 1.0 / (1.0 + diffuse_light * 0.25)), passthrough); */
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tgt_color = color;
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}
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