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refactor shadows.glsl

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MihailRis 2025-06-11 19:44:33 +03:00
parent 1a3fb9f5b3
commit 9cc59c8848
1 changed files with 26 additions and 49 deletions
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75
res/shaders/lib/shadows.glsl
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@ -4,59 +4,36 @@
uniform sampler2DShadow u_shadows[2];
uniform mat4 u_shadowsMatrix[2];
uniform float u_dayTime;
uniform int u_shadowsRes;
float calc_shadow() {
float shadow = 1.0;
if (u_enableShadows) {
vec4 mpos = u_shadowsMatrix[0] * vec4(a_modelpos.xyz + a_realnormal * 0.04, 1.0);
vec3 projCoords = mpos.xyz / mpos.w;
projCoords = projCoords * 0.5 + 0.5;
projCoords.z -= 0.0001;
vec4 wmpos = u_shadowsMatrix[1] * vec4(a_modelpos.xyz + a_realnormal * 0.2, 1.0);
vec3 wprojCoords = wmpos.xyz / wmpos.w;
wprojCoords = wprojCoords * 0.5 + 0.5;
wprojCoords.z -= 0.0001;
shadow = 0.0;
// TODO: optimize
if (dot(a_realnormal, u_sunDir) < 0.0 || true) {
if (a_distance > 128) {
for (int y = -1; y <= 1; y++) {
for (int x = -1; x <= 1; x++) {
shadow += texture(
u_shadows[1],
wprojCoords.xyz +
vec3(x, y, -(abs(x) + abs(y))) /
u_shadowsRes
);
}
}
shadow /= 9;
} else {
for (int y = -2; y <= 2; y++) {
for (int x = -2; x <= 2; x++) {
shadow += texture(
u_shadows[0],
projCoords.xyz +
vec3(x, y, -(abs(x) + abs(y))) /
u_shadowsRes * 1.0
);
}
}
shadow /= 25;
}
float s = abs(cos(u_dayTime * 3.141592 * 2.0));
s = pow(s, 0.7);
shadow = mix(0.5, shadow * 0.5 + 0.5, s);
} else {
shadow = 0.5;
}
if (!u_enableShadows) {
return 1.0;
}
return shadow;
float step = 1.0 / float(u_shadowsRes);
float s = pow(abs(cos(u_dayTime * 6.283185)), 0.7); // 2*PI precomputed
vec3 normalOffset = a_realnormal * (a_distance > 128.0 ? 0.2 : 0.04);
int shadowIdx = a_distance > 128.0 ? 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 -= 0.0001;
float shadow = 0.0;
if (dot(a_realnormal, u_sunDir) < 0.0) {
for (int y = -1; y <= 1; y++) {
for (int x = -1; x <= 1; x++) {
vec3 offset = vec3(x, y, -(abs(x) + abs(y))) * step;
shadow += texture(u_shadows[shadowIdx], projCoords + offset);
}
}
shadow /= 9.0;
} else {
shadow = 0.5;
}
return 0.5 * (1.0 + s * shadow);
}
#endif // SHADOWS_GLSL_