1 files changed, 27 insertions, 4 deletions

diff --git a/2d/softbody/softbody_2/SpringRectangle.h b/2d/softbody/softbody_2/SpringRectangle.h
index b45bd3c..bc8eed8 100644
--- a/2d/softbody/softbody_2/SpringRectangle.h
+++ b/2d/softbody/softbody_2/SpringRectangle.h
@@ -2,24 +2,33 @@
 #include "../../../shared_cpp/types.h"
 #include "../../../shared_cpp/mathlib.h"
 
+struct SoftbodyUpdateVertexData {
+	Vector2 position;
+};
 
 struct SoftbodyRectangle {
 	float32 width = 100;
 	float32 height = 100;
 
+	Vector2 position = Vector2(300, 400);
+
 	// Represents the density of springs that will be in the rectangle.
 	int32 springDensity = 10;
-
-	int32 numSubdivisions = 0;
+	SoftbodyUpdateVertexData* updateData = NULL;
 
 	Mesh2d mesh;
+	Mesh2d pointsMesh;
+
+	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];
+		updateData = new SoftbodyUpdateVertexData[numVertices];
 		auto indices = new GLuint[numIndices];
 
+		// Load a square with the desired density
 		int32 vIdx = 0;
 		int32 iIdx = 0;
 		float32 inverseDensity = 1.f / springDensity;
@@ -28,6 +37,7 @@ struct SoftbodyRectangle {
 			for (int32 x = 0; x < springDensity; x++) { // Columns
 			    Vector2 position = Vector2(x * inverseDensity - halfInv, y * inverseDensity- halfInv);
 				vertices[vIdx] = { position, Vector4(1, 0, 0, 1) };
+			    updateData[vIdx].position = position;
 
 				if (y != springDensity - 1 && x != springDensity - 1) {
 					indices[iIdx++] = vIdx;
@@ -42,22 +52,35 @@ struct SoftbodyRectangle {
 			}
 		}
 
-		mesh.load(vertices, numVertices, indices, numIndices, renderer);
+		mesh.load(vertices, numVertices, indices, numIndices, renderer, GL_DYNAMIC_DRAW);
 		mesh.model = Mat4x4().scale(Vector3(width, height, 0)).translateByVec2(Vector2(300, 400));
 
+	    pointsVertices = new Vertex2d[numVertices];
+		for (int32 v = 0; v < numVertices; v++) {
+			pointsVertices[v].position = vertices[v].position;
+			pointsVertices[v].color = Vector4(1, 1, 0, 1);
+		}
+		pointsMesh.load(pointsVertices, numVertices, renderer, GL_DYNAMIC_DRAW);
+		
 		delete [] vertices;
 		delete [] indices;
 	}
 
 	void update(float32 dtSeconds) {
-
+		for (int32 v = 0; v < pointsMesh.numVertices; v++) {
+			pointsVertices[v].position = Vector2(updateData[v].position.x * width, updateData[v].position.y * height) + position;
+		}
+		pointsMesh.updateVertices(pointsVertices);
 	}
 
 	void render(Renderer2d* renderer) {
 		mesh.render(renderer);
+		pointsMesh.render(renderer, GL_POINTS);
 	}
 
 	void unload() {
 		mesh.unload();
+		pointsMesh.unload();
+		delete [] pointsVertices;
 	}
 };