feat: post-effects array parameters & add gfx.posteffects.set_array & make shadows opacity depending on clouds opacity

res/scripts/hud.lua

@@ -1,3 +1,25 @@
+local function configure_SSAO()
+    local slot = gfx.posteffects.index("core:default")
+    gfx.posteffects.set_effect(slot, "ssao")
+    gfx.posteffects.set_intensity(slot, 1.0)
+
+    -- Generating random SSAO samples
+    local buffer = Bytearray(0)
+    for i = 0, 63 do
+        local x = math.random() * 2.0 - 1.0
+        local y = math.random() * 2.0 - 1.0
+        local z = math.random()
+        local len = math.sqrt(x * x + y * y + z * z)
+        if len > 0 then
+            x = x / len
+            y = y / len
+            z = z / len
+        end
+        Bytearray.append(buffer, byteutil.pack("fff", x, y, z))
+    end
+    gfx.posteffects.set_array(slot, "u_ssaoSamples", Bytearray_as_string(buffer))
+end
+
 function on_hud_open()
     input.add_callback("player.pick", function ()
         if hud.is_paused() or hud.is_inventory_open() then
@@ -55,8 +77,4 @@ function on_hud_open()
             player.set_vel(pid, 0, 1, 0)
         end
     end)
-
-    local slot = gfx.posteffects.index("core:default")
-    gfx.posteffects.set_effect(slot, "ssao")
-    gfx.posteffects.set_intensity(slot, 1.0)
 end

res/shaders/effects/ssao.glsl

@@ -1,8 +1,7 @@
-uniform vec3 u_ssaoSamples[64];
-
-int kernelSize = 16;
-float radius = 0.25;
-float bias = 0.025;
+#param vec3 u_ssaoSamples[64]
+#param int u_kernelSize = 16
+#param float u_radius = 0.25
+#param float u_bias = 0.025
 
 vec4 effect() {
     vec2 noiseScale = u_screenSize / 4.0;
@@ -17,9 +16,9 @@ vec4 effect() {
     mat3 tbn = mat3(tangent, bitangent, normal);
 
     float occlusion = 0.0;
-    for (int i = 0; i < kernelSize; i++) {
+    for (int i = 0; i < u_kernelSize; i++) {
         vec3 samplePos = tbn * u_ssaoSamples[i];
-        samplePos = position + samplePos * radius; 
+        samplePos = position + samplePos * u_radius; 
         
         vec4 offset = vec4(samplePos, 1.0);
         offset = u_projection * offset;
@@ -27,10 +26,10 @@ vec4 effect() {
         offset.xyz = offset.xyz * 0.5 + 0.5;
         
         float sampleDepth = texture(u_position, offset.xy).z;
-        float rangeCheck = smoothstep(0.0, 1.0, radius / abs(position.z - sampleDepth));
-        occlusion += (sampleDepth >= samplePos.z + bias ? 1.0 : 0.0) * rangeCheck;
+        float rangeCheck = smoothstep(0.0, 1.0, u_radius / abs(position.z - sampleDepth));
+        occlusion += (sampleDepth >= samplePos.z + u_bias ? 1.0 : 0.0) * rangeCheck;
     }
-    occlusion = min(1.0, 1.05 - (occlusion / kernelSize));
+    occlusion = min(1.0, 1.05 - (occlusion / u_kernelSize));
 
     float z = -position.z * 0.02;
     z = max(0.0, 1.0 - z);

res/shaders/lib/shadows.glsl

@@ -1,10 +1,14 @@
 #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() {
     if (!u_enableShadows) {
@@ -12,24 +16,25 @@ float calc_shadow() {
     }
 
     float step = 1.0 / float(u_shadowsRes);
-    float s = pow(abs(cos(u_dayTime * 6.283185)), 0.5); // 2*PI precomputed
-    vec3 normalOffset = a_realnormal * (a_distance > 128.0 ? 0.2 : 0.04);
-    int shadowIdx = a_distance > 128.0 ? 1 : 0;
+    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 > 64.0 ? 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;
+    projCoords.z -= 0.00001;
 
     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;
+        // 5x5 kernel
+        for (int y = -2; y <= 2; y++) {
+            for (int x = -2; x <= 2; x++) {
+                vec3 offset = vec3(x, y, -(abs(x) + abs(y)) * 0.1) * step * 2.0 * u_shadowsSoftness;
                 shadow += texture(u_shadows[shadowIdx], projCoords + offset);
             }
         }
-        shadow /= 9.0;
+        shadow /= 25.0;
     } else {
         shadow = 0.5;
     }