59 lines
1.5 KiB
Scala
59 lines
1.5 KiB
Scala
$input v_normal, v_texcoord0
|
|
|
|
/*
|
|
* Copyright 2017 Stanislav Pidhorskyi. All rights reserved.
|
|
* License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
|
|
*/
|
|
|
|
#include "../common/common.sh"
|
|
|
|
SAMPLER2D(s_texLightmap, 0);
|
|
uniform vec4 u_sunDirection;
|
|
uniform vec4 u_sunLuminance;
|
|
uniform vec4 u_skyLuminance;
|
|
uniform vec4 u_parameters;
|
|
|
|
// https://www.shadertoy.com/view/4ssXRX
|
|
// http://www.loopit.dk/banding_in_games.pdf
|
|
// http://www.dspguide.com/ch2/6.htm
|
|
|
|
//uniformly distributed, normalized rand, [0, 1)
|
|
float nrand(in vec2 n)
|
|
{
|
|
return fract(sin(dot(n.xy, vec2(12.9898, 78.233)))* 43758.5453);
|
|
}
|
|
|
|
float n4rand_ss(in vec2 n)
|
|
{
|
|
float nrnd0 = nrand( n + 0.07*fract( u_parameters.w ) );
|
|
float nrnd1 = nrand( n + 0.11*fract( u_parameters.w + 0.573953 ) );
|
|
return 0.23*sqrt(-log(nrnd0+0.00001))*cos(2.0*3.141592*nrnd1)+0.5;
|
|
}
|
|
|
|
float toLinear(float _rgb)
|
|
{
|
|
return pow(abs(_rgb), 2.2);
|
|
}
|
|
|
|
void main()
|
|
{
|
|
vec3 normal = normalize(v_normal);
|
|
|
|
float occulsion = toLinear(texture2D(s_texLightmap, v_texcoord0).r);
|
|
|
|
vec3 skyDirection = vec3(0.0, 0.0, 1.0);
|
|
|
|
float diffuseSun = max(0.0, dot(normal, normalize(u_sunDirection.xyz)));
|
|
float diffuseSky = 1.0 + 0.5 * dot(normal, skyDirection);
|
|
|
|
vec3 color = diffuseSun * u_sunLuminance.rgb + (diffuseSky * u_skyLuminance.rgb + 0.01) * occulsion;
|
|
color *= 0.5;
|
|
|
|
//color = mix(color, (u_skyLuminance + u_sunLuminance)*0.3, v_fogFactor);
|
|
|
|
gl_FragColor.xyz = color * u_parameters.z;
|
|
gl_FragColor.w = 1.0;
|
|
float r = n4rand_ss(gl_FragCoord.xy) / 40.0;
|
|
gl_FragColor.xyz = toGamma(gl_FragColor.xyz) + vec3(r, r, r);
|
|
}
|