4 files changed, 37 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;
 	}
 };
diff --git a/2d/softbody/softbody_2/dist/output.js b/2d/softbody/softbody_2/dist/output.js
index 864fed6..2502d5e 100644
--- a/2d/softbody/softbody_2/dist/output.js
+++ b/2d/softbody/softbody_2/dist/output.js
@@ -2573,6 +2573,14 @@ var ASM_CONSTS = {
       }
     }
 
+  function _glBufferSubData(target, offset, size, data) {
+      if (GL.currentContext.version >= 2) { // WebGL 2 provides new garbage-free entry points to call to WebGL. Use those always when possible.
+        GLctx.bufferSubData(target, offset, HEAPU8, data, size);
+        return;
+      }
+      GLctx.bufferSubData(target, offset, HEAPU8.subarray(data, data+size));
+    }
+
   function _glClear(x0) { GLctx['clear'](x0) }
 
   function _glClearColor(x0, x1, x2, x3) { GLctx['clearColor'](x0, x1, x2, x3) }
@@ -3062,6 +3070,7 @@ var asmLibraryArg = {
   "glBindBuffer": _glBindBuffer,
   "glBindVertexArray": _glBindVertexArray,
   "glBufferData": _glBufferData,
+  "glBufferSubData": _glBufferSubData,
   "glClear": _glClear,
   "glClearColor": _glClearColor,
   "glClearDepth": _glClearDepth,
diff --git a/2d/softbody/softbody_2/dist/output.wasm b/2d/softbody/softbody_2/dist/output.wasm
index 8f52a3d..4d1241e 100755
--- a/2d/softbody/softbody_2/dist/output.wasm
+++ b/2d/softbody/softbody_2/dist/output.wasm
diff --git a/2d/softbody/softbody_2/main.cpp b/2d/softbody/softbody_2/main.cpp
index 80686f9..29cecd6 100644
--- a/2d/softbody/softbody_2/main.cpp
+++ b/2d/softbody/softbody_2/main.cpp
@@ -46,6 +46,7 @@ void load() {
 
 void update(float32 deltaTimeSeconds, void* userData) {
 	// -- Update
+	rectangle.update(deltaTimeSeconds);
 	
 	// -- Render
 	renderer.render();