From 8b02f97579728fdbc160095073bf87c88bed3f07 Mon Sep 17 00:00:00 2001
From: mattkae <mattkae@protonmail.com>
Date: Sat, 22 Jan 2022 16:36:33 -0500
Subject: Randomly updating the vertices on my rectrangle

---
 2d/softbody/softbody_2/SpringRectangle.h |  29 ++++++++++++++++++++++++++---
 2d/softbody/softbody_2/dist/output.wasm  | Bin 36383 -> 44516 bytes
 2 files changed, 26 insertions(+), 3 deletions(-)

(limited to '2d')

diff --git a/2d/softbody/softbody_2/SpringRectangle.h b/2d/softbody/softbody_2/SpringRectangle.h
index bc8eed8..47f4aff 100644
--- a/2d/softbody/softbody_2/SpringRectangle.h
+++ b/2d/softbody/softbody_2/SpringRectangle.h
@@ -4,6 +4,11 @@
 
 struct SoftbodyUpdateVertexData {
 	Vector2 position;
+
+	SoftbodyUpdateVertexData* left;
+	SoftbodyUpdateVertexData* right;
+	SoftbodyUpdateVertexData* top;
+	SoftbodyUpdateVertexData* bottom;
 };
 
 struct SoftbodyRectangle {
@@ -14,17 +19,19 @@ struct SoftbodyRectangle {
 
 	// Represents the density of springs that will be in the rectangle.
 	int32 springDensity = 10;
+	float32 totalTimeSeconds = 0.f;
 	SoftbodyUpdateVertexData* updateData = NULL;
 
 	Mesh2d mesh;
 	Mesh2d pointsMesh;
 
+	Vertex2d* vertices = NULL;
 	Vertex2d* pointsVertices = NULL;
 
 	void load(Renderer2d* renderer) {
 	    int32 numVertices = springDensity * springDensity; // Each subdivision is a square.
 		int32 numIndices = 6 * ((springDensity - 1) * (springDensity - 1));
-	    auto vertices = new Vertex2d[numVertices];
+	    vertices = new Vertex2d[numVertices];
 		updateData = new SoftbodyUpdateVertexData[numVertices];
 		auto indices = new GLuint[numIndices];
 
@@ -39,6 +46,11 @@ struct SoftbodyRectangle {
 				vertices[vIdx] = { position, Vector4(1, 0, 0, 1) };
 			    updateData[vIdx].position = position;
 
+				if (x != 0) updateData[vIdx].left = &updateData[vIdx - 1];
+				if (x != springDensity - 1) updateData[vIdx].right = &updateData[vIdx + 1];
+				if (y != 0) updateData[vIdx].top = &updateData[vIdx - springDensity];
+				if (y != springDensity - 1) updateData[vIdx].bottom = &updateData[vIdx + springDensity];
+
 				if (y != springDensity - 1 && x != springDensity - 1) {
 					indices[iIdx++] = vIdx;
 					indices[iIdx++] = vIdx + 1;
@@ -60,16 +72,26 @@ struct SoftbodyRectangle {
 			pointsVertices[v].position = vertices[v].position;
 			pointsVertices[v].color = Vector4(1, 1, 0, 1);
 		}
+		pointsMesh.model = mesh.model;
 		pointsMesh.load(pointsVertices, numVertices, renderer, GL_DYNAMIC_DRAW);
 		
-		delete [] vertices;
 		delete [] indices;
 	}
 
 	void update(float32 dtSeconds) {
+		totalTimeSeconds += dtSeconds;
 		for (int32 v = 0; v < pointsMesh.numVertices; v++) {
-			pointsVertices[v].position = Vector2(updateData[v].position.x * width, updateData[v].position.y * height) + position;
+			float32 r = rand();
+			updateData[v].position += (Vector2(cosf(r), sinf(r)) * 0.005f);
+
+
+			Vector2 nextPosition = Vector2(updateData[v].position.x, updateData[v].position.y);
+			
+			vertices[v].position = nextPosition;
+			pointsVertices[v].position = nextPosition;
 		}
+
+		mesh.updateVertices(vertices);
 		pointsMesh.updateVertices(pointsVertices);
 	}
 
@@ -81,6 +103,7 @@ struct SoftbodyRectangle {
 	void unload() {
 		mesh.unload();
 		pointsMesh.unload();
+		delete [] vertices;
 		delete [] pointsVertices;
 	}
 };
diff --git a/2d/softbody/softbody_2/dist/output.wasm b/2d/softbody/softbody_2/dist/output.wasm
index 4d1241e..35a32bd 100755
Binary files a/2d/softbody/softbody_2/dist/output.wasm and b/2d/softbody/softbody_2/dist/output.wasm differ
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