Added a few clearing-up code tweaks

hello_world.cu

@@ -1,25 +1,14 @@
 #include <iostream>
 #include <cuda_runtime.h>
 
-#define cudaCheckError() {                                      \
-    cudaError_t e = cudaGetLastError();                         \
-    if (e != cudaSuccess) {                                     \
-        printf("CUDA error %s:%d: %s\n", __FILE__, __LINE__,    \
-               cudaGetErrorString(e));                          \
-        exit(EXIT_FAILURE);                                     \
-    }                                                           \
-}
-
 __global__ void hello_from_gpu() {
     printf("Hello from GPU!\n");
 }
 
 int main() {
     hello_from_gpu<<<1, 1>>>();
-    cudaCheckError();
 
     cudaDeviceSynchronize();
-    cudaCheckError();
 
     // Reset device
     cudaDeviceReset();

test_heavy.cu

@@ -65,9 +65,10 @@ __global__ void renderKernel(unsigned char* framebuffer, Sphere* spheres, int nu
     Vec3 rayOrigin(0, 0, 0);
     Vec3 colCum(0, 0, 0);
 
+    double spp = static_cast<double>(SAMPLES_PER_PIXEL);
     for (int sample = 0; sample < SAMPLES_PER_PIXEL; sample++) {
-        double u = (x + (sample / static_cast<double>(SAMPLES_PER_PIXEL)) - WIDTH / 2.0) / WIDTH;
-        double v = (y + (sample / static_cast<double>(SAMPLES_PER_PIXEL)) - HEIGHT / 2.0) / HEIGHT;
+        double u = (x + (sample / spp) - WIDTH / 2.0) / WIDTH;
+        double v = (y + (sample / spp) - HEIGHT / 2.0) / HEIGHT;
         Vec3 rayDir(u, v, 1.0);
         rayDir = rayDir.normalize();