From 5f41d4cded56121af66b18c232c7f557ab803f94 Mon Sep 17 00:00:00 2001
From: Akshay Nair <phenax5@gmail.com>
Date: Sun, 27 Sep 2026 12:06:00 +0530
Subject: Add headless screenshot + fix scaling for antialiasing for vacation

---
 build.gradle.kts                                   |  16 ++-
 justfile                                           |   6 +
 screenshot/vacation.VacationProgram.png            | Bin 0 -> 2135153 bytes
 src/main/kotlin/org/openrndr/Preload.kt            |   7 +-
 src/main/kotlin/phenax/extensions/CameraManager.kt |   6 +-
 .../kotlin/phenax/extensions/HeadlessScreenshot.kt |  30 +++++
 src/main/kotlin/phenax/utils/program.kt            |   7 +-
 src/main/kotlin/seigaiha/SeigaihaProgram.kt        |   2 +-
 src/main/kotlin/vacation/VacationProgram.kt        |  16 ++-
 src/main/resources/shaders/vacation.glsl           | 133 +++++++++++----------
 video/.empty                                       |   1 -
 11 files changed, 147 insertions(+), 77 deletions(-)
 create mode 100644 screenshot/vacation.VacationProgram.png
 create mode 100644 src/main/kotlin/phenax/extensions/HeadlessScreenshot.kt
 delete mode 100644 video/.empty

diff --git a/build.gradle.kts b/build.gradle.kts
index 694f23f..6fb1cb9 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -339,10 +339,18 @@ tasks.register<JavaExec>("record") {
     classpath = runTask.classpath
     args = runTask.args ?: emptyList()
 
-    environment("RECORD", "1")
-    // doFirst {
-    //     jvmArgs = (runTask.jvmArgs ?: emptyList()) + listOf("-Dorg.openrndr.application=EGL")
-    // }
+    environment("PHENAX_RECORD", "1")
+}
+
+tasks.register<JavaExec>("screenshot") {
+    group = "application"
+    val runTask = tasks.named<JavaExec>("run").get()
+
+    mainClass.set(runTask.mainClass)
+    classpath = runTask.classpath
+    args = runTask.args ?: emptyList()
+
+    environment("PHENAX_SCREENSHOT", "1")
 }
 
 if (properties["openrndr.tasks"] == "true") {
diff --git a/justfile b/justfile
index e4b4c36..2989070 100644
--- a/justfile
+++ b/justfile
@@ -7,6 +7,12 @@ record name:
 record-windowed name:
   ./gradlew record -Popenrndr.application={{name}}.$(echo "{{name}}" | sed -E 's/^(\w)/\U\1/')ProgramKt
 
+screenshot name:
+  xvfb-run --server-args="-screen 0 1920x1080x24" just screenshot-windowed "{{name}}"
+
+screenshot-windowed name:
+  ./gradlew screenshot -Popenrndr.application={{name}}.$(echo "{{name}}" | sed -E 's/^(\w)/\U\1/')ProgramKt
+
 update:
   ./gradlew dependencyUpydates
 
diff --git a/screenshot/vacation.VacationProgram.png b/screenshot/vacation.VacationProgram.png
new file mode 100644
index 0000000..528ef09
Binary files /dev/null and b/screenshot/vacation.VacationProgram.png differ
diff --git a/src/main/kotlin/org/openrndr/Preload.kt b/src/main/kotlin/org/openrndr/Preload.kt
index 1bbd673..9664416 100644
--- a/src/main/kotlin/org/openrndr/Preload.kt
+++ b/src/main/kotlin/org/openrndr/Preload.kt
@@ -1,14 +1,19 @@
 package org.openrndr
 
 import org.openrndr.draw.*
+import org.openrndr.extensions.Screenshots
+import org.openrndr.extra.olive.*
 import phenax.extensions.HeadlessRecorder
-import phenax.utils.recordingEnabled
+import phenax.extensions.HeadlessScreenshot
+import phenax.utils.*
 
 class Preload : ApplicationPreload() {
   override fun onProgramSetup(program: Program) {
     println("BACKEND(${program.name}): ${program.application::class.qualifiedName}")
     if (recordingEnabled) {
       program.extend(HeadlessRecorder())
+    } else if (screenshotEnabled) {
+      program.extend(HeadlessScreenshot())
     }
   }
 }
diff --git a/src/main/kotlin/phenax/extensions/CameraManager.kt b/src/main/kotlin/phenax/extensions/CameraManager.kt
index d14205f..5112332 100644
--- a/src/main/kotlin/phenax/extensions/CameraManager.kt
+++ b/src/main/kotlin/phenax/extensions/CameraManager.kt
@@ -7,7 +7,7 @@ import org.openrndr.draw.*
 import org.openrndr.math.Quaternion
 import org.openrndr.math.Vector2
 import org.openrndr.math.Vector3
-import phenax.utils.recordingEnabled
+import phenax.utils.*
 
 enum class ActionType {
   PAN,
@@ -35,7 +35,7 @@ class CameraManager(public var cameraPosition: Vector3, public var cameraRotatio
   }
 
   override fun setup(program: Program) {
-    if (recordingEnabled) return
+    if (recordingEnabled || screenshotEnabled) return
 
     cameraQuaternion = Quaternion.fromAngles(cameraRotation.x, cameraRotation.y, cameraRotation.z)
 
@@ -99,7 +99,7 @@ class CameraManager(public var cameraPosition: Vector3, public var cameraRotatio
   override fun beforeDraw(drawer: Drawer, program: Program) {}
 
   override fun afterDraw(drawer: Drawer, program: Program) {
-    if (recordingEnabled) return
+    if (recordingEnabled || screenshotEnabled) return
 
     drawer.fontMap = font
     drawer.fill = ColorRGBa.WHITE
diff --git a/src/main/kotlin/phenax/extensions/HeadlessScreenshot.kt b/src/main/kotlin/phenax/extensions/HeadlessScreenshot.kt
new file mode 100644
index 0000000..35de05d
--- /dev/null
+++ b/src/main/kotlin/phenax/extensions/HeadlessScreenshot.kt
@@ -0,0 +1,30 @@
+package phenax.extensions
+
+import org.openrndr.*
+import org.openrndr.draw.*
+import org.openrndr.extensions.SingleScreenshot
+import org.openrndr.ffmpeg.VideoWriter
+
+class HeadlessScreenshot : Extension {
+  override var enabled: Boolean = true
+
+  var screenshots: SingleScreenshot? = null
+  var videoWriter: VideoWriter? = null
+  var maxFrameCount: Int? = null
+
+  override fun setup(program: Program) {
+    val scr = SingleScreenshot()
+    screenshots = scr
+    program.extend(scr) {
+      outputFile = "screenshot/${program.name}.png"
+    }
+  }
+
+  override fun beforeDraw(drawer: Drawer, program: Program) {}
+
+  override fun afterDraw(drawer: Drawer, program: Program) {
+    screenshots?.trigger()
+
+    // program.application.exit()
+  }
+}
diff --git a/src/main/kotlin/phenax/utils/program.kt b/src/main/kotlin/phenax/utils/program.kt
index fe48351..cfbe9c9 100644
--- a/src/main/kotlin/phenax/utils/program.kt
+++ b/src/main/kotlin/phenax/utils/program.kt
@@ -19,7 +19,8 @@ fun recordDuration(millis: Int) {
 
 fun recordDuration(): Int? = System.getProperty("phenax.record.frameCount")?.toIntOrNull()
 
-val recordingEnabled: Boolean by lazy { System.getenv("RECORD") != null }
+val recordingEnabled: Boolean by lazy { System.getenv("PHENAX_RECORD") != null }
+val screenshotEnabled: Boolean by lazy { System.getenv("PHENAX_SCREENSHOT") != null }
 
 // fun classDir(): String =
 //     "src/main/kotlin/${stackRootClassName(sanitize =
@@ -30,7 +31,7 @@ val recordingEnabled: Boolean by lazy { System.getenv("RECORD") != null }
 
 // Have to keep the same name (oliveProgram) to get update on save to work
 fun ApplicationBuilder.oliveProgram(init: Program.() -> Unit) {
-  if (recordingEnabled) {
+  if (recordingEnabled || screenshotEnabled) {
     program(init)
   } else {
     // TODO: Make watching shader files work
@@ -88,7 +89,7 @@ fun Program.liveComputeShader(name: String): ReadOnlyProperty<Any?, ComputeShade
 
   var cs: ComputeShader = ComputeShader.fromCode(shaderCode, name)
 
-  if (!recordingEnabled) {
+  if (!recordingEnabled || screenshotEnabled) {
     var lastCompiledCode: String = shaderCode
 
     program.extend {
diff --git a/src/main/kotlin/seigaiha/SeigaihaProgram.kt b/src/main/kotlin/seigaiha/SeigaihaProgram.kt
index 8894664..ae3e411 100644
--- a/src/main/kotlin/seigaiha/SeigaihaProgram.kt
+++ b/src/main/kotlin/seigaiha/SeigaihaProgram.kt
@@ -10,7 +10,7 @@ import phenax.utils.*
 fun main() = application {
   recordDuration(5.seconds())
 
-  if (recordingEnabled) {
+  if (recordingEnabled || screenshotEnabled) {
     configure {
       width = 1920
       height = 1080
diff --git a/src/main/kotlin/vacation/VacationProgram.kt b/src/main/kotlin/vacation/VacationProgram.kt
index 041c009..b4d9d12 100644
--- a/src/main/kotlin/vacation/VacationProgram.kt
+++ b/src/main/kotlin/vacation/VacationProgram.kt
@@ -10,10 +10,18 @@ import phenax.utils.*
 fun main() = application {
   recordDuration(5.seconds())
 
-  configure {
-    width = 640
-    height = 480
-    windowResizable = false
+  if (recordingEnabled || screenshotEnabled) {
+    configure {
+      width = 1920
+      height = 1080
+      windowResizable = false
+    }
+  } else {
+    configure {
+      width = 640
+      height = 360
+      windowResizable = false
+    }
   }
 
   oliveProgram {
diff --git a/src/main/resources/shaders/vacation.glsl b/src/main/resources/shaders/vacation.glsl
index c343691..c1aeb2a 100644
--- a/src/main/resources/shaders/vacation.glsl
+++ b/src/main/resources/shaders/vacation.glsl
@@ -9,11 +9,17 @@ uniform float seconds = 0;
 layout(rgba8) uniform readonly image2D noise_texture;
 layout(rgba8) uniform writeonly image2D output_image;
 
+const float antialiasing = 0.28;
+
 float sample_noise(in vec2 p) {
   vec4 noise = imageLoad(noise_texture, ivec2(p * imageSize(noise_texture)));
   return noise.x;
 }
 
+mat2x2 rot_matrix(float angle) {
+  return mat2x2(cos(angle), -sin(angle), sin(angle), cos(angle));
+}
+
 vec3 image(vec2 uv) {
   const vec3 sky_color = srgb(0.57, 0.7, 0.91);
   const vec3 dark_water_color = srgb(0.02, 0.36, 0.6);
@@ -32,19 +38,21 @@ vec3 image(vec2 uv) {
 
   vec3 color = sky_color;
 
-  vec2 sunpos = vec2(0.2, 0.08);
+  vec2 sunpos = vec2(0.2, 0.1);
   float sunsize = 0.05;
   float sun = sdf_circle(uv - sunpos, sunsize);
   float sunshine = sdf_circle((uv - sunpos) * vec2(0.4, 1.2), sunsize) * 3;
   color = mix(color, sunshine_color, 1 - clamp(sunshine, 0, 1));
   color = mix(color, sun_color, step(sun, 0));
 
-  float dark_cloud = clamp(sample_noise((uv + 0.4) * 0.8 + vec2(0.28, 0)) - 0.1, 0, 1);
-  color = mix(color, dark_cloud_color, dark_cloud);
-  float cloud = clamp(sample_noise((uv + vec2(0.5, 0.5)) * 0.6 + vec2(0.18, 0)) - 0.2, 0, 1);
-  color = mix(color, mix(cloud_color, sunshine_cloud_color, 1. - clamp(sunshine * 2, 0, 1)), cloud);
+  {
+    float dark_cloud = clamp(sample_noise((uv + 0.4) * 0.8 + vec2(0.28, 0)) - 0.1, 0, 1);
+    color = mix(color, dark_cloud_color, dark_cloud);
+    float cloud = clamp(sample_noise((uv + vec2(0.5, 0.5)) * 0.6 + vec2(0.18, 0)) - 0.2, 0, 1);
+    color = mix(color, mix(cloud_color, sunshine_cloud_color, 1. - clamp(sunshine * 2, 0, 1)), cloud);
+  }
 
-  float water = uv.y + sin(uv.x * 3 - 1) * 0.01 + fbm(uv * 40) * 0.004;
+  float water = uv.y - 0.03 + sin(uv.x * 3 - 1) * 0.01 + fbm(uv * 40) * 0.004;
   vec2 water_noise_seed = uv - 2;
   vec3 shaded_water_color = water_color;
   shaded_water_color = mix(shaded_water_color, dark_water_color, clamp(exp((uv.y - 0.03) / 0.1), 0, 1));
@@ -60,72 +68,77 @@ vec3 image(vec2 uv) {
   shaded_wet_sand_color = mix(shaded_wet_sand_color, clamp(dark_sand_color * 1.5, 0, 1), clamp(abs(uv.y * (uv.x - 0.3)) * 4, 0, 1));
   shaded_wet_sand_color = mix(shaded_wet_sand_color, dark_sand_color, clamp(fbm(uv * 600) * fbm(uv * 10 - 8), 0, 1));
 
-  float wet_sand = uv.y + 0.03;
-  color = mix(color, mix(shaded_wet_sand_color, shaded_water_color, clamp(((uv.y - 0.04) * 3 + 1.2), 0, 1)), step(wet_sand, 0));
+  float wet_sand = uv.y + 0.;
+  color = mix(color, mix(shaded_wet_sand_color, shaded_water_color, clamp(((uv.y - 0.04) * 4 + 1.2), 0, 1)), step(wet_sand, 0));
 
   float wshadow_noise = clamp(fbm(80 * water_noise_seed) * noise(8 * water_noise_seed), 0, 1);
-  color = mix(color, dark_water_color, step(-uv.y - 0.26, 0) * step(water, 0) * clamp((uv.y - 0.08) * sin((uv.x / 3 + wshadow_noise - 1.84) * sin(uv.y) * 40), 0, 1));
+  color = mix(color, dark_water_color, step(-uv.y - 0.19, 0) * step(water, 0) * clamp((uv.y - 0.08) * sin((uv.x / 5 + wshadow_noise - 1.84) * sin(uv.y * 2.4) * 40), 0, 1));
   float wfoam_noise = clamp(fbm(100 * water_noise_seed) * noise(8 * water_noise_seed), 0, 1);
-  color = mix(color, vec3(1), step(water, 0) * clamp((uv.y - 0.01) * sin((uv.x / 3 + wfoam_noise - 2.2) * sin(uv.y * 1.4) * 25), 0, 1));
-
-  float sand = uv.y + sin(uv.x * 3 + 0.) * 0.07 + fbm(uv * 40) * 0.012;
-  vec3 shaded_sand_color = sand_color;
-  float sand_shine = clamp(abs((uv.y + 0.5) * (uv.x + 0.5) * 12), 0, 1);
-  shaded_sand_color = mix(shaded_sand_color, mix(sunshine_color, sand_color, 0.5), sand_shine);
-  float sand_shadow = sdf_circle(uv * vec2(0.3, 1) + vec2(0.16, 0.4), 0.1);
-  shaded_sand_color = mix(shaded_sand_color, sand_shadow_color, 1 - smoothstep(sand_shadow, -0.1, -0.04));
-  shaded_sand_color = mix(shaded_sand_color, dark_sand_color, clamp(fbm(uv * 600) * fbm(uv * 40 + 9), 0, 1));
-  color = mix(color, shaded_sand_color, step(sand, -0.33));
-
-  vec2 boatpos = uv - vec2(0.14, -0.02);
-  float boatrefgap = 0.012;
-  float boatid = clamp(round(boatpos.y / boatrefgap), -1, 0);
-  boatpos.y -= boatid * boatrefgap;
-  boatid += 1;
-  boatpos.y *= boatid * 2 - 1 + (1 - boatid) * 0.4;
-  boatpos.x += (1 - boatid) * (0.02 * wfoam_noise + boatpos.y * 0.3);
-  float boatsize = 0.005;
-  float boatsail = sdf_box(boatpos - vec2(-1.8 + boatpos.y * 20, 5.2) * boatsize, vec2(2 * (1 - boatpos.y * 18), 4) * boatsize, 0.004);
-  boatsail = min(boatsail, sdf_box(boatpos - vec2(-1.0, 1) * boatsize, vec2(0.4, 2) * boatsize, 0.0));
-  float boat = sdf_box(boatpos - vec2(boatpos.y * 50, -0.1) * boatsize, vec2(5 * (1 + boatpos.y * 20), 1.2) * boatsize, 0.0);
-  vec3 boat_refl_color = mix(shaded_water_color, vec3(0), clamp(uv.y * 2 + 0.5, 0, 1));
-  color = mix(color, mix(boat_refl_color, vec3(0), boatid), step(min(boatsail, boat), 0));
-
-  float island = sdf_circle(uv * vec2(0.25, 1.0) + vec2(0.06, 0), 0.05 - fbm((uv + 0.06) * 25) * 0.04);
-  vec3 shaded_island_color = sand_color;
-  shaded_island_color = mix(shaded_island_color, clamp(dark_sand_color * 1.5, 0, 1), clamp(abs(uv.y * (uv.x - 0.3)) * 4, 0, 1));
-  shaded_island_color = mix(shaded_island_color, dark_sand_color, clamp(fbm(uv * 600) * fbm(uv * 10 - 8), 0, 1));
-  color = mix(color, shaded_island_color, step(island, -0.01));
-
-  float tree_size = 0.01;
-  float trunk = sdf_box(uv - vec2(-0.15 + sin(uv.y * 30 - 1.5) * 0.01, 0.03),
-      tree_size * vec2(0.2 + abs((uv.y - 0.03) * 5 - 0.3) * 0.3, 2.4),
-      0.001);
-  vec3 shaded_trunk_color = dark_tree_trunk_color;
-  color = mix(color, shaded_trunk_color, step(trunk, 0));
-
-  // float leafbranchcurve = sin(-uv.x * 8 + 0.2) * 0.06;
-  // float leafsizecurve = (sin(uv.x * 8 - 6.9) + 0.16) * 0.05;
-  // vec2 leafpos = uv;
-  // leafpos -= vec2(-0.26 + sin(uv.y * 8 + 0.5) * 0.06, 0.18 + leafbranchcurve + leafsizecurve);
-  // float leafgap = 0.012;
-  // float leafindex = clamp(round(leafpos.x / leafgap), -7, 21);
-  // leafpos.x = leafpos.x - leafgap * leafindex;
-  // float leaf = sdf_box(leafpos, vec2(abs(leafpos.y * 0.1 + 0.014) * 0.26, 0.02 - leafsizecurve), 0.0);
-  // color = mix(color, vec3(0.0, 0.3, 0.0), step(leaf, 0));
-  // float leaf_stick = sdf_box(uv - vec2(-0.13, 0.20 + leafbranchcurve), vec2(0.19, 0.008), 0.02);
-  // color = mix(color, vec3(0.0, 0.06, 0.0), step(leaf_stick, 0));
+  color = mix(color, vec3(1), step(water, 0) * clamp((uv.y - 0.0) * sin((uv.x / 5 + wfoam_noise - 2.2) * sin(uv.y * 2.4) * 25), 0, 1));
+
+  {
+    float sand = uv.y - 0.08 + sin(uv.x * 3 + 0.) * 0.09 + fbm(uv * 40) * 0.012 + fbm(uv * 4) * 0.034;
+    vec3 shaded_sand_color = sand_color;
+    float sand_shine = clamp(abs((uv.y + 0.5) * (uv.x + 0.5) * 12), 0, 1);
+    shaded_sand_color = mix(shaded_sand_color, mix(sunshine_color, sand_color, 0.5), sand_shine);
+    float sand_shadow = sdf_circle(uv * vec2(0.3, 1) + vec2(0.16, 0.4), 0.1);
+    shaded_sand_color = mix(shaded_sand_color, sand_shadow_color, 1 - smoothstep(sand_shadow, -0.1, -0.04));
+    shaded_sand_color = mix(shaded_sand_color, dark_sand_color, clamp(fbm(uv * 600) * fbm(uv * 40 + 9), 0, 1));
+    color = mix(color, shaded_sand_color, step(sand, -0.33));
+  }
+
+  {
+    vec2 boatpos = uv - vec2(0.14, 0.0);
+    float boatrefgap = 0.012;
+    float boatid = clamp(round(boatpos.y / boatrefgap), -1, 0);
+    boatpos.y -= boatid * boatrefgap;
+    boatid += 1;
+    boatpos.y *= boatid * 2 - 1 + (1 - boatid) * 0.4;
+    boatpos.x += (1 - boatid) * (0.02 * wfoam_noise + boatpos.y * 0.3);
+    float boatsize = 0.005;
+    float boatsail = sdf_box(boatpos - vec2(-1.8 + boatpos.y * 20, 5.3) * boatsize, vec2(2 * (1 - boatpos.y * 18), 4) * boatsize, 0.006);
+    boatsail = min(boatsail, sdf_box(boatpos - vec2(-1.0, 1) * boatsize, vec2(0.4, 2) * boatsize, 0.0));
+    float boat = sdf_box(boatpos - vec2(boatpos.y * 50, -0.1) * boatsize, vec2(5 * (1 + boatpos.y * 20), 1.2) * boatsize, 0.0);
+    vec3 boat_refl_color = mix(shaded_water_color, vec3(0), clamp(uv.y * 2 + 0.5, 0, 1));
+    color = mix(color, mix(boat_refl_color, vec3(0), boatid), step(min(boatsail, boat), 0));
+  }
+
+  {
+    vec2 islandpos = uv * vec2(0.25, 1.0) + vec2(0.06, -0.00);
+    float island = sdf_circle(islandpos, 0.05 - fbm((islandpos + 0.09) * 27) * 0.04);
+    vec3 shaded_island_color = sand_color;
+    shaded_island_color = mix(shaded_island_color, clamp(dark_sand_color * 1.5, 0, 1), clamp(abs(uv.y * (uv.x - 0.3)) * 4, 0, 1));
+    shaded_island_color = mix(shaded_island_color, dark_sand_color, clamp(fbm(uv * 600) * fbm(uv * 10 - 8), 0, 1));
+    color = mix(color, shaded_island_color, step(island, -0.01));
+  }
+
+  {
+    float treesize = 0.01;
+    vec2 treepos = uv - vec2(-15, 3) * treesize;
+    float trunk = sdf_box(treepos - vec2(sin(uv.y * 30 - 1.5), 0) * treesize,
+        treesize * vec2(0.2 + abs((uv.y - 0.03) * 5 - 0.3) * 0.3, 2.4),
+        0.003);
+    vec3 shaded_trunk_color = dark_tree_trunk_color;
+    color = mix(color, shaded_trunk_color, step(trunk, 0));
+
+    {
+      vec2 leafpos = treepos - vec2(0.1, 3.1) * treesize;
+      float leafs = sdf_box(leafpos - vec2(0), vec2(2.1, 1.6) * treesize, 1.4 * treesize);
+      color = mix(color, srgb(0.0, 0.4, 0.0), step(leafs, 0));
+    }
+  }
 
   return color;
 }
 
 vec3 antialiased_image(vec2 uv) {
-  float anti_aliasing = 0.0006;
+  vec2 resolution = vec2(imageSize(output_image).xy);
+  float s = antialiasing / max(resolution.x, resolution.y);
   vec3 sum = vec3(0);
   int count = 0;
   for (int i = -2; i < 2; i++)
     for (int j = -2; j < 2; j++, count++)
-      sum += image(uv + vec2(i, j) * anti_aliasing);
+      sum += image(uv + vec2(i, j) * s);
   return sum / count;
 }
 
diff --git a/video/.empty b/video/.empty
deleted file mode 100644
index 8b13789..0000000
--- a/video/.empty
+++ /dev/null
@@ -1 +0,0 @@
-
-- 
cgit v1.3.1