Added constants + exported external variables

src/consts.cu

@@ -0,0 +1,18 @@
+#include "consts.h"
+
+__device__ Point3 d_cameraPos;
+__device__ Vec3 d_cameraDir;
+__device__ Vec3 d_cameraUp;
+__device__ Point3 d_lightPos;
+
+Point3 h_cameraPos = Point3::init(-0.7, -1.0, -2.0);
+Vec3 h_cameraDir = Vec3::init(0.4, 0.6, 1.0).normalize();
+Vec3 h_cameraUp = Vec3::init(0.0, 1.0, 0.0).normalize();
+Point3 h_lightPos = Point3::init(1.5, 2.0, -1.0);
+
+void copyConstantsToDevice() {
+    cudaMemcpyToSymbol(d_cameraPos, &h_cameraPos, sizeof(Point3));
+    cudaMemcpyToSymbol(d_cameraDir, &h_cameraDir, sizeof(Vec3));
+    cudaMemcpyToSymbol(d_cameraUp, &h_cameraUp, sizeof(Vec3));
+    cudaMemcpyToSymbol(d_lightPos, &h_lightPos, sizeof(Point3));
+}