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109 lines
4.2 KiB
GLSL
109 lines
4.2 KiB
GLSL
#version 420 core
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#include <constants.glsl>
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#define LIGHTING_TYPE LIGHTING_TYPE_REFLECTION
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#define LIGHTING_REFLECTION_KIND LIGHTING_REFLECTION_KIND_GLOSSY
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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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#include <globals.glsl>
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layout(location = 0) in vec3 f_pos;
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layout(location = 0) out vec4 tgt_color;
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#include <sky.glsl>
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#include <light.glsl>
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#include <lod.glsl>
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const float FADE_DIST = 32.0;
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void main() {
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vec3 trail_color = vec3(.55, .92, 1.0);
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float trail_alpha = 0.01;
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// Controls how much light affects alpha variation. TODO: Maybe a better name?
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float light_variable = 0.25;
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#ifdef EXPERIMENTAL_BAREMINIMUM
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tgt_color = vec4(trail_color, trail_alpha);
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return;
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#endif
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// Using this as norm seems to work, so...
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vec3 f_norm = vec3(0, 0, -1);
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vec3 cam_to_frag = normalize(f_pos - cam_pos.xyz);
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vec3 view_dir = -cam_to_frag;
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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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#if (SHADOW_MODE == SHADOW_MODE_CHEAP || SHADOW_MODE == SHADOW_MODE_MAP)
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vec4 f_shadow = textureBicubic(t_horizon, s_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;
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#endif
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float moon_shade_frac = 1.0;
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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, f_pos);
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DirectionalLight moon_info = get_moon_info(moon_dir, point_shadow * moon_shade_frac);
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float alpha = 1.0;
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const float n2 = 1.5;
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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 < f_alt) ? mix(R_s2s1 * R_s1s0, R_s1s0, medium.x) : mix(R_s2s0, R_s1s2 * R_s2s0, medium.x);
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vec3 k_a = vec3(1.0);
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vec3 k_d = vec3(1.0);
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vec3 k_s = vec3(R_s);
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vec3 emitted_light, reflected_light;
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// This is a bit of a hack. Because we can't find the volumetric lighting of each particle (they don't talk to the
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// CPU) we need to some how find an approximation of how much the sun is blocked. We do this by fading out the sun
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// as the particle moves underground. This isn't perfect, but it does at least mean that particles don't look like
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// they're exposed to the sun when in dungeons
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const float SUN_FADEOUT_DIST = 20.0;
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sun_info.block *= clamp((f_pos.z - f_alt) / SUN_FADEOUT_DIST + 1, 0, 1);
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// To account for prior saturation.
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float max_light = 0.0;
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vec3 cam_attenuation = vec3(1);
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float fluid_alt = max(f_pos.z + 1, floor(f_alt + 1));
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vec3 mu = medium.x == MEDIUM_WATER ? MU_WATER : vec3(0.0);
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#if (FLUID_MODE == FLUID_MODE_SHINY)
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cam_attenuation =
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medium.x == MEDIUM_WATER ? compute_attenuation_point(cam_pos.xyz, view_dir, MU_WATER, fluid_alt, /*cam_pos.z <= fluid_alt ? cam_pos.xyz : f_pos*/f_pos)
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: compute_attenuation_point(f_pos, -view_dir, vec3(0), fluid_alt, /*cam_pos.z <= fluid_alt ? cam_pos.xyz : f_pos*/cam_pos.xyz);
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#endif
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max_light += get_sun_diffuse2(sun_info, moon_info, f_norm, view_dir, f_pos, mu, cam_attenuation, fluid_alt, k_a, k_d, k_s, alpha, f_norm, 1.0, emitted_light, reflected_light);
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max_light += lights_at(f_pos, f_norm, view_dir, mu, cam_attenuation, fluid_alt, k_a, k_d, k_s, alpha, f_norm, 1.0, emitted_light, reflected_light);
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// Make less faint at day (relative to night) by adding light to alpha. Probably hacky but looks fine.
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trail_alpha += max_light * light_variable;
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tgt_color = vec4(trail_color, trail_alpha);
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}
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