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refactoring + texture projection

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This commit is contained in:
Nick Fisher
2025-03-25 09:39:02 +08:00
parent 0cbbc058e0
commit 999b1e613f
33 changed files with 7357 additions and 1168 deletions
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96
thermion_dart/lib/src/utils/src/geometry.dart
View File

@@ -5,8 +5,8 @@ import '../../../thermion_dart.dart';
class GeometryHelper {
static Geometry fullscreenQuad() {
final vertices = Float32List.fromList(
[-1.0, -1.0, 1.0, 3.0, -1.0, 1.0, -1.0, 3.0, 1.0]);
final vertices =
Float32List.fromList([-1.0, -1.0, 1.0, 3.0, -1.0, 1.0, -1.0, 3.0, 1.0]);
final indices = [0, 1, 2];
return Geometry(vertices, indices);
}
@@ -59,7 +59,8 @@ class GeometryHelper {
return Geometry(vertices, indices, normals: _normals, uvs: _uvs);
}
static Geometry cube({bool normals = true, bool uvs = true}) {
static Geometry cube(
{bool normals = true, bool uvs = true, bool flipUvs = true}) {
final vertices = Float32List.fromList([
// Front face
-1, -1, 1, // 0
@@ -175,44 +176,49 @@ class GeometryHelper {
])
: null;
// Original UV coordinates
var originalUvs = <double>[
// front
1 / 3, 3 / 4, // 0
2 / 3, 3 / 4, // 1
2 / 3, 1, // 2
1 / 3, 1, // 3
// back
1 / 3, 1 / 4, // 4
2 / 3, 1 / 4, // 5
2 / 3, 1 / 2, // 6
1 / 3, 1 / 2, // 7
// top
2 / 3, 1 / 2, // 8
1, 1 / 2, // 9
1, 3 / 4, // 10
2 / 3, 3 / 4, // 11
// bottom
0, 1 / 2, // 12
1 / 3, 1 / 2, // 13
1 / 3, 3 / 4, // 14
0, 3 / 4, // 15
// right
1 / 3, 1 / 2, // 16
2 / 3, 1 / 2, // 17
2 / 3, 3 / 4, // 18
1 / 3, 3 / 4, // 19
// left
1 / 3, 0, // 20
2 / 3, 0, // 21
2 / 3, 1 / 4, // 22
1 / 3, 1 / 4 // 23
];
// Apply UV flipping if requested
final _uvs = uvs
? Float32List.fromList([
// front
1 / 3, 3 / 4, // 0
2 / 3, 3 / 4, // 1
2 / 3, 1, // 2
1 / 3, 1, // 3
// back
1 / 3, 1 / 4, // 4
2 / 3, 1 / 4, // 5
2 / 3, 1 / 2, // 6
1 / 3, 1 / 2, // 7
// top
2 / 3, 1 / 2, // 8
1, 1 / 2, // 9
1, 3 / 4, // 10
2 / 3, 3 / 4, // 11
// bottom
0, 1 / 2, // 12
1 / 3, 1 / 2, // 13
1 / 3, 3 / 4, // 14
0, 3 / 4, // 15
// right
1 / 3, 1 / 2, // 16
2 / 3, 1 / 2, // 17
2 / 3, 3 / 4, // 18
1 / 3, 3 / 4, // 19
// left
1 / 3, 0, // 20
2 / 3, 0, // 21
2 / 3, 1 / 4, // 22
1 / 3, 1 / 4 // 23
])
? Float32List.fromList(
flipUvs ? _flipUvCoordinates(originalUvs) : originalUvs)
: null;
final indices = [
@@ -229,9 +235,19 @@ class GeometryHelper {
// Left face
20, 21, 22, 20, 22, 23 // 4,0,3,4,3,7
];
return Geometry(vertices, indices, normals: _normals, uvs: _uvs);
}
// Helper function to flip the Y coordinate of UV coordinates (y = 1.0 - y)
static List<double> _flipUvCoordinates(List<double> uvs) {
var flippedUvs = List<double>.from(uvs);
for (var i = 1; i < flippedUvs.length; i += 2) {
flippedUvs[i] = 1.0 - flippedUvs[i];
}
return flippedUvs;
}
static Geometry cylinder(
{double radius = 1.0,
double length = 1.0,

27
thermion_dart/lib/src/utils/src/image.dart
View File

@@ -2,8 +2,8 @@ import 'dart:math';
import 'dart:typed_data';
import 'package:image/image.dart' as img;
Future<Uint8List> pixelBufferToBmp(
Uint8List pixelBuffer, int width, int height) async {
Future<Uint8List> pixelBufferToBmp(Uint8List pixelBuffer, int width, int height,
{bool hasAlpha = true, bool isFloat = false}) async {
final rowSize = (width * 3 + 3) & ~3;
final padding = rowSize - (width * 3);
final fileSize = 54 + rowSize * height;
@@ -28,14 +28,29 @@ Future<Uint8List> pixelBufferToBmp(
bd.setInt32(38, 2835, Endian.little); // X pixels per meter
bd.setInt32(42, 2835, Endian.little); // Y pixels per meter
Float32List? floatData;
if (isFloat) {
floatData = pixelBuffer.buffer.asFloat32List(
pixelBuffer.offsetInBytes, width * height * (hasAlpha ? 4 : 3));
}
// Pixel data (BMP stores in BGR format)
for (var y = 0; y < height; y++) {
for (var x = 0; x < width; x++) {
final srcIndex = (y * width + x) * 4; // RGBA format
final srcIndex = (y * width + x) * (hasAlpha ? 4 : 3); // RGBA format
final dstIndex = 54 + y * rowSize + x * 3; // BGR format
data[dstIndex] = pixelBuffer[srcIndex + 2]; // Blue
data[dstIndex + 1] = pixelBuffer[srcIndex + 1]; // Green
data[dstIndex + 2] = pixelBuffer[srcIndex]; // Red
data[dstIndex] = isFloat
? (floatData![srcIndex + 2] * 255).toInt()
: pixelBuffer[srcIndex + 2]; // Blue
data[dstIndex + 1] = isFloat
? (floatData![srcIndex + 1] * 255).toInt()
: pixelBuffer[srcIndex + 1]; // Green
data[dstIndex + 2] = isFloat
? (floatData![srcIndex] * 255).toInt()
: pixelBuffer[srcIndex]; // Red
// Alpha channel is discarded
}
// Add padding to the end of each row