48 lines
1.3 KiB
GLSL
48 lines
1.3 KiB
GLSL
#ifndef SHADOWS_GLSL_
|
|
#define SHADOWS_GLSL_
|
|
|
|
#include <constants>
|
|
|
|
uniform sampler2DShadow u_shadows[2];
|
|
uniform mat4 u_shadowsMatrix[2];
|
|
uniform float u_dayTime;
|
|
uniform int u_shadowsRes;
|
|
uniform float u_shadowsOpacity;
|
|
uniform float u_shadowsSoftness;
|
|
|
|
float calc_shadow() {
|
|
#ifdef ENABLE_SHADOWS
|
|
float step = 1.0 / float(u_shadowsRes);
|
|
float s = pow(abs(cos(u_dayTime * PI2)), 0.25) * u_shadowsOpacity;
|
|
vec3 normalOffset = a_realnormal * (a_distance > 64.0 ? 0.2 : 0.04);
|
|
int shadowIdx = a_distance > 80.0 ? 1 : 0;
|
|
|
|
vec4 mpos = u_shadowsMatrix[shadowIdx] * vec4(a_modelpos.xyz + normalOffset, 1.0);
|
|
vec3 projCoords = mpos.xyz / mpos.w;
|
|
projCoords = projCoords * 0.5 + 0.5;
|
|
projCoords.z -= 0.00001 / u_shadowsRes;
|
|
if (shadowIdx > 0) {
|
|
projCoords.z -= 0.001;
|
|
}
|
|
|
|
float shadow = 0.0;
|
|
if (dot(a_realnormal, u_sunDir) < 0.0) {
|
|
// 3x3 kernel
|
|
for (int y = -1; y <= 1; y++) {
|
|
for (int x = -1; x <= 1; x++) {
|
|
vec3 offset = vec3(x, y, -(abs(x) + abs(y)) * 0.8) * step * 1.0 * u_shadowsSoftness;
|
|
shadow += texture(u_shadows[shadowIdx], projCoords + offset);
|
|
}
|
|
}
|
|
shadow /= 9.0;
|
|
} else {
|
|
shadow = 0.5;
|
|
}
|
|
return 0.5 * (1.0 + s * shadow);
|
|
#else
|
|
return 1.0;
|
|
#endif
|
|
}
|
|
|
|
#endif // SHADOWS_GLSL_
|