createRenderTarget utility method.

Author: xclud

CHANGELOG.md

@@ -1,7 +1,10 @@
+## 0.0.3
+
+- `createRenderTarget` utility method.
+
 ## 0.0.2
 
 - Load `ShaderLibrary` utility method.
-
 ## 0.0.1
 
 - Initial version.

lib/gpu.dart

@@ -1,7 +1,36 @@
+import "dart:typed_data";
+
 import "package:flutter_gpu/gpu.dart" as gpu;
+import 'package:vector_math/vector_math.dart' as vm;
 
 gpu.PixelFormat get defaultColorFormat => gpu.gpuContext.defaultColorFormat;
 
+/// Loads a shader library from an asset.
 gpu.ShaderLibrary loadShaderLibrary(String assetName) {
   return gpu.ShaderLibrary.fromAsset(assetName)!;
 }
+
+/// Creates a fullscreen 2D Triangle.
+gpu.DeviceBuffer createTriangle() {
+  final vertices = Float32List.fromList([
+    -0.5, -0.5, // Vertex 1
+    0.5, -0.5, // Vertex 2
+    0.0, 0.5, // Vertex 3
+  ]);
+
+  final verticesDeviceBuffer =
+      gpu.gpuContext.createDeviceBufferWithCopy(ByteData.sublistView(vertices));
+
+  return verticesDeviceBuffer;
+}
+
+/// Creates a GPU Render target with specified dimensions.
+gpu.RenderTarget createRenderTarget(int width, int height) {
+  final texture = gpu.gpuContext
+      .createTexture(gpu.StorageMode.devicePrivate, width, height);
+
+  final renderTarget = gpu.RenderTarget.singleColor(gpu.ColorAttachment(
+      texture: texture, clearValue: vm.Vector4(0, 0, 1, 1)));
+
+  return renderTarget;
+}

pubspec.yaml

@@ -12,6 +12,7 @@ dependencies:
     sdk: flutter
   flutter_gpu:
     sdk: flutter
+  vector_math: ^2.2.0
 
 dev_dependencies:
   flutter_test: