fix: add back invalidations

Author: silenium-dev

src/main/java/dev/silenium/compose/gl/surface/GLSurfaceView.kt

@@ -63,11 +63,13 @@ fun GLSurfaceView(
     cleanup: suspend () -> Unit = {},
     draw: suspend GLDrawScope.() -> Unit,
 ) {
+    var invalidations by remember { mutableStateOf(0) }
     val surfaceView = remember {
         val currentContext = glContextProvider.fromCurrent() ?: error("No current EGL context")
         GLSurfaceView(
             state = state,
             parentContext = currentContext,
+            invalidate = { invalidations++ },
             paint = paint,
             presentMode = presentMode,
             swapChainSize = swapChainSize,
@@ -115,9 +117,11 @@ fun GLSurfaceView(
                     }
                 }
         ) {
+            invalidations.let {
                 directContext?.let { directContext ->
                     surfaceView.display(drawContext.canvas.nativeCanvas, directContext)
                 }
+            }
         }
     }
     DisposableEffect(surfaceView) {
@@ -137,6 +141,7 @@ class GLSurfaceView internal constructor(
     private val parentContext: GLContext<*>,
     private val drawBlock: suspend GLDrawScope.() -> Unit,
     private val cleanupBlock: suspend () -> Unit = {},
+    private val invalidate: () -> Unit = {},
     private val paint: Paint = Paint(),
     private val presentMode: PresentMode = PresentMode.MAILBOX,
     private val swapChainSize: Int = 10,
@@ -181,6 +186,7 @@ class GLSurfaceView internal constructor(
     internal fun display(canvas: Canvas, displayContext: DirectContext) {
         val t1 = System.nanoTime()
         fboPool?.display { displayImpl(canvas, displayContext) }
+        invalidate()
         val t2 = System.nanoTime()
         state.onDisplay(t2, (t2 - t1).nanoseconds)
     }
@@ -242,6 +248,7 @@ class GLSurfaceView internal constructor(
                 break
             }
             val waitTime = renderResult.getOrNull()
+            invalidate()
             val renderEnd = System.nanoTime()
             state.onRender(renderEnd, (renderEnd - renderStart).nanoseconds)
             lastFrame = renderStart

src/test/kotlin/Main.kt

@@ -6,6 +6,7 @@ import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.*
 import androidx.compose.material.Button
 import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Surface
 import androidx.compose.material.Text
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
@@ -62,7 +63,6 @@ fun ApplicationScope.App() {
                 glClearColor(color.red, color.green, color.blue, color.alpha)
                 glClear(GL_COLOR_BUFFER_BIT)
                 glBegin(GL_QUADS)
-                // fat rectangle from top left to bottom right
                 glColor3f(1f, 0f, 0f)
                 glVertex2f(-1f, 0f)
                 glColor3f(0f, 1f, 0f)
@@ -76,20 +76,22 @@ fun ApplicationScope.App() {
                 val wait = (1000.0 / 60).milliseconds
                 redrawAfter(null)
             }
-            Column(modifier = Modifier.align(Alignment.TopStart).padding(4.dp)) {
-                val display by state.displayStatistics.collectAsState()
-                Text("Display datapoints: ${display.frameTimes.values.size}")
-                Text("Display frame time: ${display.frameTimes.median.inWholeMicroseconds / 1000.0} ms")
-                Text("Display frame time (99th): ${display.frameTimes.percentile(0.99).inWholeMicroseconds / 1000.0} ms")
-                Text("Display FPS: ${display.fps.median}")
-                Text("Display FPS (99th): ${display.fps.percentile(0.99, Stats.Percentile.LOWEST)}")
+            Surface(modifier = Modifier.align(Alignment.TopStart).padding(4.dp)) {
+                Column(modifier = Modifier.padding(4.dp).width(400.dp)) {
+                    val display by state.displayStatistics.collectAsState()
+                    Text("Display datapoints: ${display.frameTimes.values.size}")
+                    Text("Display frame time: ${display.frameTimes.median.inWholeMicroseconds / 1000.0} ms")
+                    Text("Display frame time (99th): ${display.frameTimes.percentile(0.99).inWholeMicroseconds / 1000.0} ms")
+                    Text("Display FPS: ${display.fps.median}")
+                    Text("Display FPS (99th): ${display.fps.percentile(0.99, Stats.Percentile.LOWEST)}")
 
-                val render by state.renderStatistics.collectAsState()
-                Text("Render datapoints: ${render.frameTimes.values.size}")
-                Text("Render frame time: ${render.frameTimes.median.inWholeMicroseconds / 1000.0} ms")
-                Text("Render frame time (99th): ${render.frameTimes.percentile(0.99).inWholeMicroseconds / 1000.0} ms")
-                Text("Render FPS: ${render.fps.median} ms")
-                Text("Render FPS (99th): ${render.fps.percentile(0.99, Stats.Percentile.LOWEST)}")
+                    val render by state.renderStatistics.collectAsState()
+                    Text("Render datapoints: ${render.frameTimes.values.size}")
+                    Text("Render frame time: ${render.frameTimes.median.inWholeMicroseconds / 1000.0} ms")
+                    Text("Render frame time (99th): ${render.frameTimes.percentile(0.99).inWholeMicroseconds / 1000.0} ms")
+                    Text("Render FPS: ${render.fps.median} ms")
+                    Text("Render FPS (99th): ${render.fps.percentile(0.99, Stats.Percentile.LOWEST)}")
+                }
             }
             Button(
                 onClick = ::exitApplication,