diff options
| -rw-r--r-- | scene/resources/sky_material.cpp | 100 |
1 files changed, 53 insertions, 47 deletions
diff --git a/scene/resources/sky_material.cpp b/scene/resources/sky_material.cpp index 1cdabe4662..ee6a26bc65 100644 --- a/scene/resources/sky_material.cpp +++ b/scene/resources/sky_material.cpp @@ -522,53 +522,59 @@ PhysicalSkyMaterial::PhysicalSkyMaterial() { code += "}\n\n"; code += "void fragment() {\n"; - code += "\tfloat zenith_angle = clamp( dot(UP, normalize(LIGHT0_DIRECTION)), -1.0, 1.0 );\n"; - code += "\tfloat sun_energy = max(0.0, 1.0 - exp(-((PI * 0.5) - acos(zenith_angle)))) * SUN_ENERGY * LIGHT0_ENERGY;\n"; - code += "\tfloat sun_fade = 1.0 - clamp(1.0 - exp(LIGHT0_DIRECTION.y), 0.0, 1.0);\n\n"; - - code += "\t// rayleigh coefficients\n"; - code += "\tfloat rayleigh_coefficient = rayleigh - ( 1.0 * ( 1.0 - sun_fade ) );\n"; - code += "\tvec3 rayleigh_beta = rayleigh_coefficient * rayleigh_color.rgb * 0.0001;\n"; - code += "\t// mie coefficients from Preetham\n"; - code += "\tvec3 mie_beta = turbidity * mie * mie_color.rgb * 0.000434;\n\n"; - - code += "\t// optical length\n"; - code += "\tfloat zenith = acos(max(0.0, dot(UP, EYEDIR)));\n"; - code += "\tfloat optical_mass = 1.0 / (cos(zenith) + 0.15 * pow(93.885 - degrees(zenith), -1.253));\n"; - code += "\tfloat rayleigh_scatter = rayleigh_zenith_size * optical_mass;\n"; - code += "\tfloat mie_scatter = mie_zenith_size * optical_mass;\n\n"; - - code += "\t// light extinction based on thickness of atmosphere\n"; - code += "\tvec3 extinction = exp(-(rayleigh_beta * rayleigh_scatter + mie_beta * mie_scatter));\n\n"; - - code += "\t// in scattering\n"; - code += "\tfloat cos_theta = dot(EYEDIR, normalize(LIGHT0_DIRECTION));\n\n"; - - code += "\tfloat rayleigh_phase = (3.0 / (16.0 * PI)) * (1.0 + pow(cos_theta * 0.5 + 0.5, 2.0));\n"; - code += "\tvec3 betaRTheta = rayleigh_beta * rayleigh_phase;\n\n"; - - code += "\tfloat mie_phase = henyey_greenstein(cos_theta, mie_eccentricity);\n"; - code += "\tvec3 betaMTheta = mie_beta * mie_phase;\n\n"; - - code += "\tvec3 Lin = pow(sun_energy * ((betaRTheta + betaMTheta) / (rayleigh_beta + mie_beta)) * (1.0 - extinction), vec3(1.5));\n"; - code += "\t// Hack from https://github.com/mrdoob/three.js/blob/master/examples/jsm/objects/Sky.js\n"; - code += "\tLin *= mix(vec3(1.0), pow(sun_energy * ((betaRTheta + betaMTheta) / (rayleigh_beta + mie_beta)) * extinction, vec3(0.5)), clamp(pow(1.0 - zenith_angle, 5.0), 0.0, 1.0));\n\n"; - - code += "\t// Hack in the ground color\n"; - code += "\tLin *= mix(ground_color.rgb, vec3(1.0), smoothstep(-0.1, 0.1, dot(UP, EYEDIR)));\n\n"; - - code += "\t// Solar disk and out-scattering\n"; - code += "\tfloat sunAngularDiameterCos = cos(LIGHT0_SIZE * sun_disk_scale);\n"; - code += "\tfloat sunAngularDiameterCos2 = cos(LIGHT0_SIZE * sun_disk_scale*0.5);\n"; - code += "\tfloat sundisk = smoothstep(sunAngularDiameterCos, sunAngularDiameterCos2, cos_theta);\n"; - code += "\tvec3 L0 = (sun_energy * 1900.0 * extinction) * sundisk * LIGHT0_COLOR;\n"; - code += "\tL0 += texture(night_sky, SKY_COORDS).xyz * extinction;\n\n"; - - code += "\tvec3 color = (Lin + L0) * 0.04;\n"; - code += "\tCOLOR = pow(color, vec3(1.0 / (1.2 + (1.2 * sun_fade))));\n"; - code += "\tCOLOR *= exposure;\n"; - code += "\t// Make optional, eliminates banding\n"; - code += "\tCOLOR += (hash(EYEDIR * 1741.9782) * 0.08 - 0.04) * 0.016 * dither_strength;\n"; + code += "\tif (LIGHT0_ENABLED) {\n"; + code += "\t\tfloat zenith_angle = clamp( dot(UP, normalize(LIGHT0_DIRECTION)), -1.0, 1.0 );\n"; + code += "\t\tfloat sun_energy = max(0.0, 1.0 - exp(-((PI * 0.5) - acos(zenith_angle)))) * SUN_ENERGY * LIGHT0_ENERGY;\n"; + code += "\t\tfloat sun_fade = 1.0 - clamp(1.0 - exp(LIGHT0_DIRECTION.y), 0.0, 1.0);\n\n"; + + code += "\t\t// rayleigh coefficients\n"; + code += "\t\tfloat rayleigh_coefficient = rayleigh - ( 1.0 * ( 1.0 - sun_fade ) );\n"; + code += "\t\tvec3 rayleigh_beta = rayleigh_coefficient * rayleigh_color.rgb * 0.0001;\n"; + code += "\t\t// mie coefficients from Preetham\n"; + code += "\t\tvec3 mie_beta = turbidity * mie * mie_color.rgb * 0.000434;\n\n"; + + code += "\t\t// optical length\n"; + code += "\t\tfloat zenith = acos(max(0.0, dot(UP, EYEDIR)));\n"; + code += "\t\tfloat optical_mass = 1.0 / (cos(zenith) + 0.15 * pow(93.885 - degrees(zenith), -1.253));\n"; + code += "\t\tfloat rayleigh_scatter = rayleigh_zenith_size * optical_mass;\n"; + code += "\t\tfloat mie_scatter = mie_zenith_size * optical_mass;\n\n"; + + code += "\t\t// light extinction based on thickness of atmosphere\n"; + code += "\t\tvec3 extinction = exp(-(rayleigh_beta * rayleigh_scatter + mie_beta * mie_scatter));\n\n"; + + code += "\t\t// in scattering\n"; + code += "\t\tfloat cos_theta = dot(EYEDIR, normalize(LIGHT0_DIRECTION));\n\n"; + + code += "\t\tfloat rayleigh_phase = (3.0 / (16.0 * PI)) * (1.0 + pow(cos_theta * 0.5 + 0.5, 2.0));\n"; + code += "\t\tvec3 betaRTheta = rayleigh_beta * rayleigh_phase;\n\n"; + + code += "\t\tfloat mie_phase = henyey_greenstein(cos_theta, mie_eccentricity);\n"; + code += "\t\tvec3 betaMTheta = mie_beta * mie_phase;\n\n"; + + code += "\t\tvec3 Lin = pow(sun_energy * ((betaRTheta + betaMTheta) / (rayleigh_beta + mie_beta)) * (1.0 - extinction), vec3(1.5));\n"; + code += "\t\t// Hack from https://github.com/mrdoob/three.js/blob/master/examples/jsm/objects/Sky.js\n"; + code += "\t\tLin *= mix(vec3(1.0), pow(sun_energy * ((betaRTheta + betaMTheta) / (rayleigh_beta + mie_beta)) * extinction, vec3(0.5)), clamp(pow(1.0 - zenith_angle, 5.0), 0.0, 1.0));\n\n"; + + code += "\t\t// Hack in the ground color\n"; + code += "\t\tLin *= mix(ground_color.rgb, vec3(1.0), smoothstep(-0.1, 0.1, dot(UP, EYEDIR)));\n\n"; + + code += "\t\t// Solar disk and out-scattering\n"; + code += "\t\tfloat sunAngularDiameterCos = cos(LIGHT0_SIZE * sun_disk_scale);\n"; + code += "\t\tfloat sunAngularDiameterCos2 = cos(LIGHT0_SIZE * sun_disk_scale*0.5);\n"; + code += "\t\tfloat sundisk = smoothstep(sunAngularDiameterCos, sunAngularDiameterCos2, cos_theta);\n"; + code += "\t\tvec3 L0 = (sun_energy * 1900.0 * extinction) * sundisk * LIGHT0_COLOR;\n"; + code += "\t\tL0 += texture(night_sky, SKY_COORDS).xyz * extinction;\n\n"; + + code += "\t\tvec3 color = (Lin + L0) * 0.04;\n"; + code += "\t\tCOLOR = pow(color, vec3(1.0 / (1.2 + (1.2 * sun_fade))));\n"; + code += "\t\tCOLOR *= exposure;\n"; + code += "\t\t// Make optional, eliminates banding\n"; + code += "\t\tCOLOR += (hash(EYEDIR * 1741.9782) * 0.08 - 0.04) * 0.016 * dither_strength;\n"; + code += "\t} else {\n"; + code += "\t\t// There is no sun, so display night_sky and nothing else\n"; + code += "\t\tCOLOR = texture(night_sky, SKY_COORDS).xyz * 0.04;\n"; + code += "\t\tCOLOR *= exposure;\n"; + code += "\t}\n"; code += "}\n"; shader = RS::get_singleton()->shader_create(); |