4 files changed, 86 insertions, 84 deletions
diff --git a/src/main/resources/shaders/modules/noise.glsl b/src/main/resources/shaders/modules/noise.glsl
new file mode 100644
index 0000000..ebedd6d
--- /dev/null
+++ b/src/main/resources/shaders/modules/noise.glsl
@@ -0,0 +1,67 @@
+// Noise Related Functions
+float mod289(float x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
+vec4 mod289(vec4 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
+vec4 perm(vec4 x) { return mod289(((x * 34.0) + 1.0) * x); }
+float noise(vec3 p) {
+  vec3 a = floor(p);
+  vec3 d = p - a;
+  d = d * d * (3.0 - 2.0 * d);
+  vec4 b = a.xxyy + vec4(0.0, 1.0, 0.0, 1.0);
+  vec4 k1 = perm(b.xyxy);
+  vec4 k2 = perm(k1.xyxy + b.zzww);
+  vec4 c = k2 + a.zzzz;
+  vec4 k3 = perm(c);
+  vec4 k4 = perm(c + 1.0);
+  vec4 o1 = fract(k3 * (1.0 / 41.0));
+  vec4 o2 = fract(k4 * (1.0 / 41.0));
+  vec4 o3 = o2 * d.z + o1 * (1.0 - d.z);
+  vec2 o4 = o3.yw * d.x + o3.xz * (1.0 - d.x);
+  return o4.y * d.y + o4.x * (1.0 - d.y);
+}
+float PHI = 1.61803398874989484820459; // Φ = Golden Ratio
+float gold_noise(in vec2 xy, in float seed) {
+  return fract(tan(distance(xy * PHI, xy) * seed) * xy.x);
+}
+float random(vec3 scale, float seed) {
+  return fract(sin(dot(gl_GlobalInvocationID.xyz + seed, scale)) * 43758.5453 +
+               seed);
+}
+
+// Fractal Brownian Noise
+float fbm(vec3 x, int octaves) {
+  float v = 0.0;
+  float a = 0.5;
+  vec3 shift = vec3(100);
+  for (int i = 0; i < octaves; ++i) {
+    v += a * noise(x);
+    x = x * 2.0 + shift;
+    a *= 0.5;
+  }
+  return v;
+}
+
+float random(vec2 st) {
+  return fract(sin(dot(st.xy, vec2(12.9898, 78.233))) * 43758.5453123);
+}
+
+float noise(vec2 st) {
+  vec2 i = floor(st);
+  vec2 f = fract(st);
+  float a = random(i);
+  float b = random(i + vec2(1.0, 0.0));
+  float c = random(i + vec2(0.0, 1.0));
+  float d = random(i + vec2(1.0, 1.0));
+  vec2 u = f * f * (3.0 - 2.0 * f);
+  return mix(a, b, u.x) + (c - a) * u.y * (1.0 - u.x) + (d - b) * u.x * u.y;
+}
+
+float fbm(vec2 st) {
+  float value = 0.0;
+  float amplitude = 0.5;
+  for (int i = 0; i < 5; i++) {
+    value += amplitude * noise(st);
+    st *= 2.0;
+    amplitude *= 0.5;
+  }
+  return value;
+}
diff --git a/src/main/resources/shaders/modules/sdf.cs b/src/main/resources/shaders/modules/sdf.glsl
index 8121b18..8121b18 100644
--- a/src/main/resources/shaders/modules/sdf.cs
+++ b/src/main/resources/shaders/modules/sdf.glsl
diff --git a/src/main/resources/shaders/modules/utils.cs b/src/main/resources/shaders/modules/utils.glsl
index 1616e8c..1616e8c 100644
--- a/src/main/resources/shaders/modules/utils.cs
+++ b/src/main/resources/shaders/modules/utils.glsl
diff --git a/src/main/resources/shaders/play_shader.cs b/src/main/resources/shaders/play_shader.glsl
index ec19900..0737bed 100644
--- a/src/main/resources/shaders/play_shader.cs
+++ b/src/main/resources/shaders/play_shader.glsl
@@ -3,9 +3,11 @@ layout(local_size_x = 1, local_size_y = 1) in;
 
 #include <sdf>
 #include <utils>
+#include <noise>
 
 uniform float seconds = 0;
-layout(rgba8) uniform readonly image2D noise_texture;
+layout(rgba8) uniform readonly image2D cloud_noise_texture;
+// layout(rgba8) uniform readonly image2D terrain_noise_texture;
 layout(rgba8) uniform writeonly image2D output_image;
 uniform vec3 camera_position = vec3(0, 1, 0);
 uniform vec3 uv_direction = vec3(0);
@@ -15,74 +17,6 @@ uniform vec3 primary_light_position = vec3(1, 2, 1);
 #define MAX_DISTANCE 100.0
 #define SURFACE_DIST 0.01
 
-// Noise Related Functions
-float mod289(float x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
-vec4 mod289(vec4 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
-vec4 perm(vec4 x) { return mod289(((x * 34.0) + 1.0) * x); }
-float noise(vec3 p) {
-  vec3 a = floor(p);
-  vec3 d = p - a;
-  d = d * d * (3.0 - 2.0 * d);
-  vec4 b = a.xxyy + vec4(0.0, 1.0, 0.0, 1.0);
-  vec4 k1 = perm(b.xyxy);
-  vec4 k2 = perm(k1.xyxy + b.zzww);
-  vec4 c = k2 + a.zzzz;
-  vec4 k3 = perm(c);
-  vec4 k4 = perm(c + 1.0);
-  vec4 o1 = fract(k3 * (1.0 / 41.0));
-  vec4 o2 = fract(k4 * (1.0 / 41.0));
-  vec4 o3 = o2 * d.z + o1 * (1.0 - d.z);
-  vec2 o4 = o3.yw * d.x + o3.xz * (1.0 - d.x);
-  return o4.y * d.y + o4.x * (1.0 - d.y);
-}
-float PHI = 1.61803398874989484820459; // Φ = Golden Ratio
-float gold_noise(in vec2 xy, in float seed) {
-  return fract(tan(distance(xy * PHI, xy) * seed) * xy.x);
-}
-float random(vec3 scale, float seed) {
-  return fract(sin(dot(gl_GlobalInvocationID.xyz + seed, scale)) * 43758.5453 +
-               seed);
-}
-
-// Fractal Brownian Noise
-float fbm(vec3 x, int octaves) {
-  float v = 0.0;
-  float a = 0.5;
-  vec3 shift = vec3(100);
-  for (int i = 0; i < octaves; ++i) {
-    v += a * noise(x);
-    x = x * 2.0 + shift;
-    a *= 0.5;
-  }
-  return v;
-}
-
-float random(vec2 st) {
-  return fract(sin(dot(st.xy, vec2(12.9898, 78.233))) * 43758.5453123);
-}
-
-float noise(vec2 st) {
-  vec2 i = floor(st);
-  vec2 f = fract(st);
-  float a = random(i);
-  float b = random(i + vec2(1.0, 0.0));
-  float c = random(i + vec2(0.0, 1.0));
-  float d = random(i + vec2(1.0, 1.0));
-  vec2 u = f * f * (3.0 - 2.0 * f);
-  return mix(a, b, u.x) + (c - a) * u.y * (1.0 - u.x) + (d - b) * u.x * u.y;
-}
-
-float fbm(vec2 st) {
-  float value = 0.0;
-  float amplitude = 0.5;
-  for (int i = 0; i < 5; i++) {
-    value += amplitude * noise(st);
-    st *= 2.0;
-    amplitude *= 0.5;
-  }
-  return value;
-}
-
 // TODO: Enumify
 #define OID_TERRAIN 4.
 
@@ -90,8 +24,7 @@ vec2 scene(in vec3 p) {
   float c1 = sdf_circle(p - vec3(0, 1, 2.4), 0.2);
   float c2 = sdf_circle(p - vec3(-0.6, 1, 3), 0.3);
   float box = sdf_box(p - vec3(1, 0.5, 3), vec3(0.5, 0.18, 0.2), 0.07);
-  float terrain_noise = 6.0 * noise(p / 20.0) + 0.2 * noise((p + 200.0) / 2.0) +
-                        0.005 * noise((p - 50.0) * 20.0);
+  float terrain_noise = 6.0 * noise(p / 20.0) + 0.2 * noise((p + 10.0) / 2.0);
   float terrain =
       sdf_plane(p + vec3(0.0, terrain_noise, 0.0), vec3(0., 1., 0.), 0.0);
   float light_indicator =
@@ -124,13 +57,6 @@ vec2 ray_march_scene(in vec3 ray_origin, in vec3 ray_direction) {
   return vec2(dist, 0.0);
 }
 
-vec3 surface_normal_scene(in vec3 p) {
-  vec2 inc = vec2(0.01, 0);
-  return normalize(vec3(scene(p + inc.xyy).x - scene(p - inc.xyy).x,
-                        scene(p + inc.yxy).x - scene(p - inc.yxy).x,
-                        scene(p + inc.yyx).x - scene(p - inc.yyx).x));
-}
-
 float shadow_scene(in vec3 ray_origin, in vec3 ray_direction,
                    in float light_intensity) {
   float dist = 0.;
@@ -156,6 +82,13 @@ float shadow_scene(in vec3 ray_origin, in vec3 ray_direction,
   return res * res * (3.0 - 2.0 * res);
 }
 
+vec3 surface_normal_scene(in vec3 p) {
+  vec2 inc = vec2(0.01, 0);
+  return normalize(vec3(scene(p + inc.xyy).x - scene(p - inc.xyy).x,
+                        scene(p + inc.yxy).x - scene(p - inc.yxy).x,
+                        scene(p + inc.yyx).x - scene(p - inc.yyx).x));
+}
+
 void main() {
   vec2 resolution = vec2(imageSize(output_image).xy);
   vec3 uv = vec3((gl_GlobalInvocationID.xy - resolution / 2.0) / resolution, 0);
@@ -181,7 +114,7 @@ void main() {
     col = vec3(0.24, 0.61, 0.08);
   else if (oid == 0) { // Sky
     vec4 cloud_noise =
-        imageLoad(noise_texture, ivec2(gl_GlobalInvocationID.xy));
+        imageLoad(cloud_noise_texture, ivec2(gl_GlobalInvocationID.xy));
     col = vec3(0.35, 0.6, 0.9);
     col = mix(col, cloud_noise.xyz, clamp(0.5, 0., 1.));
   }
@@ -190,13 +123,15 @@ void main() {
     float contrast = 1.;
     contrast *= clamp(dot(normal, light_dir), 0, 1.);
     contrast *= shadow_scene(p, light_dir, 24.0);
-    float spe =
-        pow(clamp(dot(normal, hal), 0.0, 1.0), 16.0) * contrast *
-        (0.04 + 0.96 * pow(clamp(1.0 + dot(hal, uv_direction), 0.0, 1.0), 5.0));
     col = col * 1.1 + 0.01;
-    if (oid != OID_TERRAIN)
-      col += 12.0 * spe * vec3(1.00, 0.70, 0.5);
     col *= contrast;
+    if (oid != OID_TERRAIN) {
+      float spe =
+          pow(clamp(dot(normal, hal), 0.0, 1.0), 16.0) * contrast *
+          (0.04 +
+           0.96 * pow(clamp(1.0 + dot(hal, uv_direction), 0.0, 1.0), 5.0));
+      col += 12.0 * spe * vec3(1.00, 0.70, 0.5);
+    }
     // col *= max(0.1, exp(-0.00005 * depth * depth * depth));
   }