cup_edit/thermion_dart/test/texture_tests.dart

@Timeout(const Duration(seconds: 600))
import 'dart:ffi';
import 'dart:io';
import 'dart:typed_data';
import 'package:test/test.dart';
import 'package:thermion_dart/src/viewer/src/ffi/src/callbacks.dart';
import 'package:thermion_dart/thermion_dart.dart';
import 'helpers.dart';

void main() async {
  final testHelper = TestHelper("material");
  await testHelper.setup();

  group("image", () {
    test('create 2D texture & set from decoded image', () async {
      await testHelper.withViewer((viewer) async {
        var imageData = File(
          "${testHelper.testDir}/assets/cube_texture_512x512.png",
        ).readAsBytesSync();
        final image = await FilamentApp.instance!.decodeImage(imageData);
        expect(await image.getChannels(), 4);
        expect(await image.getWidth(), 512);
        expect(await image.getHeight(), 512);

        final texture = await FilamentApp.instance!.createTexture(
          await image.getWidth(),
          await image.getHeight(),
          textureFormat: TextureFormat.RGBA32F,
        );
        await texture.setLinearImage(
          image,
          PixelDataFormat.RGBA,
          PixelDataType.FLOAT,
        );
        await texture.dispose();
      }, bg: kRed);
    });

      test('create 2D texture and set image from raw buffer', () async {
        await testHelper.withViewer((viewer) async {
          var imageData = File(
            "${testHelper.testDir}/assets/cube_texture_512x512.png",
          ).readAsBytesSync();
          final image = await FilamentApp.instance!.decodeImage(imageData);
          expect(await image.getChannels(), 4);
          expect(await image.getWidth(), 512);
          expect(await image.getHeight(), 512);

          final texture = await FilamentApp.instance!.createTexture(
            await image.getWidth(),
            await image.getHeight(),
            textureFormat: TextureFormat.RGBA32F,
          );
          var data = await image.getData();

          await texture.setImage(
            0,
            data.buffer.asUint8List(data.offsetInBytes),
            512,
            512,
            4,
            PixelDataFormat.RGBA,
            PixelDataType.FLOAT,
          );
          await texture.dispose();
        }, bg: kRed);
      });

      test('create 3D texture and set image from buffers', () async {
        await testHelper.withViewer((viewer) async {
          final width = 128;
          final height = 128;
          final channels = 4;
          final depth = 5;
          final texture = await FilamentApp.instance!.createTexture(
            width,
            height,
            depth: depth,
            textureSamplerType: TextureSamplerType.SAMPLER_3D,
            textureFormat: TextureFormat.RGBA32F,
          );

          for (int i = 0; i < depth; i++) {
            final buffer = Uint8List(width * height * channels * sizeOf<Float>());
            await texture.setImage3D(
              0,
              0,
              0,
              i,
              width,
              height,
              channels,
              1,
              buffer,
              PixelDataFormat.RGBA,
              PixelDataType.FLOAT,
            );
          }
          await texture.dispose();
        }, bg: kRed);
      });

      test('apply 3D texture material ', () async {
        await testHelper.withViewer((viewer) async {
          final material = await FilamentApp.instance!.createMaterial(
            File(
              "/Users/nickfisher/Documents/thermion/materials/texture_array.filamat",
            ).readAsBytesSync(),
          );
          final materialInstance = await material.createInstance();
          final sampler = await FilamentApp.instance!.createTextureSampler();
          final cube = await viewer.createGeometry(
            GeometryHelper.cube(),
            materialInstances: [materialInstance],
          );

          final width = 1;
          final height = 1;
          final channels = 4;
          final numTextures = 2;
          final texture = await FilamentApp.instance!.createTexture(
            width,
            height,
            depth: numTextures,
            textureSamplerType: TextureSamplerType.SAMPLER_3D,
            textureFormat: TextureFormat.RGBA32F,
          );

          for (int i = 0; i < numTextures; i++) {
            var pixelBuffer = Float32List.fromList([
              i == 0 ? 1.0 : 0.0,
              i == 1 ? 1.0 : 0.0,
              0.0,
              1.0,
            ]);
            var byteBuffer = pixelBuffer.buffer.asUint8List(
              pixelBuffer.offsetInBytes,
            );

            await texture.setImage3D(
              0,
              0,
              0,
              i,
              width,
              height,
              channels,
              1,
              byteBuffer,
              PixelDataFormat.RGBA,
              PixelDataType.FLOAT,
            );
          }

          await materialInstance.setParameterTexture(
            "textures",
            texture,
            sampler,
          );
          await materialInstance.setParameterInt("activeTexture", 0);

          await testHelper.capture(viewer.view, "3d_texture_0");

          await materialInstance.setParameterInt("activeTexture", 1);

          await testHelper.capture(viewer.view, "3d_texture_1");

          await viewer.destroyAsset(cube);
          await materialInstance.destroy();
          await material.destroy();
          await texture.dispose();
        });
      });
    });

    group("sampler", () {
      test('create sampler', () async {
        await testHelper.withViewer((viewer) async {
          final sampler = FilamentApp.instance!.createTextureSampler();
        }, bg: kRed);
      });
    });

    
}