From 19defa9be56588803bbae0f38e2f271a91b9d690 Mon Sep 17 00:00:00 2001
From: mattkae <mattkae@protonmail.com>
Date: Sat, 22 Jan 2022 13:03:12 -0500
Subject: Rendering the square for the spring rectangle

---
 2d/softbody/softbody_2/SpringRectangle.h | 63 ++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 2d/softbody/softbody_2/SpringRectangle.h

(limited to '2d/softbody/softbody_2/SpringRectangle.h')

diff --git a/2d/softbody/softbody_2/SpringRectangle.h b/2d/softbody/softbody_2/SpringRectangle.h
new file mode 100644
index 0000000..b45bd3c
--- /dev/null
+++ b/2d/softbody/softbody_2/SpringRectangle.h
@@ -0,0 +1,63 @@
+#include "../../../shared_cpp/Renderer2d.h"
+#include "../../../shared_cpp/types.h"
+#include "../../../shared_cpp/mathlib.h"
+
+
+struct SoftbodyRectangle {
+	float32 width = 100;
+	float32 height = 100;
+
+	// Represents the density of springs that will be in the rectangle.
+	int32 springDensity = 10;
+
+	int32 numSubdivisions = 0;
+
+	Mesh2d mesh;
+
+	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];
+		auto indices = new GLuint[numIndices];
+
+		int32 vIdx = 0;
+		int32 iIdx = 0;
+		float32 inverseDensity = 1.f / springDensity;
+		float32 halfInv = inverseDensity - (inverseDensity / 2.f);
+		for (int32 y = 0; y < springDensity; y++) {  // Rows
+			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) };
+
+				if (y != springDensity - 1 && x != springDensity - 1) {
+					indices[iIdx++] = vIdx;
+					indices[iIdx++] = vIdx + 1;
+					indices[iIdx++] = vIdx + springDensity;
+					indices[iIdx++] = vIdx + springDensity;
+					indices[iIdx++] = vIdx + springDensity + 1;
+					indices[iIdx++] = vIdx + 1;
+				}
+
+				vIdx++;
+			}
+		}
+
+		mesh.load(vertices, numVertices, indices, numIndices, renderer);
+		mesh.model = Mat4x4().scale(Vector3(width, height, 0)).translateByVec2(Vector2(300, 400));
+
+		delete [] vertices;
+		delete [] indices;
+	}
+
+	void update(float32 dtSeconds) {
+
+	}
+
+	void render(Renderer2d* renderer) {
+		mesh.render(renderer);
+	}
+
+	void unload() {
+		mesh.unload();
+	}
+};
-- 
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