Add ArchStrip

openVulkanoCpp/Scene/GeometryFactory.cpp

@@ -307,4 +307,48 @@ namespace OpenVulkano::Scene
 
 		return result;
 	}
-}
+	
+	Geometry GeometryFactory::MakeArchStrip(float radius, float width, float endRadius, int segments, const Math::Vector4f& color, float endVCoord, bool indexBuffer)
+	{
+		Geometry result;
+		segments = std::max(2, segments);
+		result.Init(2 * segments, indexBuffer ? 6 * segments : 0);
+		const float segmentAngle = endRadius / static_cast<float>(segments - 1);
+		width /= 2;
+		const float segmentV = endVCoord / (segments - 1);
+		float segV = 0;
+		for(int i = 0, seg = 0; seg < segments; seg++)
+		{
+			float angle = seg * segmentAngle;
+			float z = std::cos(angle) * radius;
+			float y = std::sin(angle) * radius;
+			
+			//TODO normals
+			result.vertices[i].color = color;
+			result.vertices[i++].Set(width, y, z, +0, +0, +1, +1, +segV);
+			result.vertices[i].color = color;
+			result.vertices[i++].Set(-width, y, z, +0, +0, +1, +0, +segV);
+			segV += segmentV;
+		}
+		if (indexBuffer)
+		{
+			uint32_t* indices = new uint32_t[result.GetIndexCount()];
+			for (uint32_t i = 0, segment = 0; segment < segments; ++segment)
+			{
+				uint32_t first = segment * 2;
+				uint32_t second = first + 1;
+
+				indices[i++] = first;
+				indices[i++] = second;
+				indices[i++] = first + 2;
+
+				indices[i++] = first + 2;
+				indices[i++] = second;
+				indices[i++] = second + 2;
+			}
+			result.SetIndices(indices, result.GetIndexCount());
+		}
+		
+		return result;
+	}
+}