Apply a random seed when NOT in benchmark mode to have 100% deterministic runs in all samples (#1127)

* Apply a random seed when NOT in benchmark mode to have 100% deterministic runs

These samples lack the check for benchmark.active when applying a random seed, which is done for other samples.

* Update texture3d.cpp

examples/descriptorindexing/descriptorindexing.cpp

@@ -96,7 +96,7 @@ public:
 		textures.resize(32);
 		for (size_t i = 0; i < textures.size(); i++) {
 			std::random_device rndDevice;
-			std::default_random_engine rndEngine(rndDevice());
+			std::default_random_engine rndEngine(benchmark.active ? 0 : rndDevice());
 			std::uniform_int_distribution<> rndDist(50, UCHAR_MAX);
 			const int32_t dim = 3;
 			const size_t bufferSize = dim * dim * 4;
@@ -119,7 +119,7 @@ public:
 
 		// Generate random per-face texture indices
 		std::random_device rndDevice;
-		std::default_random_engine rndEngine(rndDevice());
+		std::default_random_engine rndEngine(benchmark.active ? 0 : rndDevice());
 		std::uniform_int_distribution<int32_t> rndDist(0, static_cast<uint32_t>(textures.size()) - 1);
 
 		// Generate cubes with random per-face texture indices

examples/graphicspipelinelibrary/graphicspipelinelibrary.cpp

@@ -374,7 +374,7 @@ public:
 		shaderStageCI.pName = "main";
 
 		// Select lighting model using a specialization constant
-		srand((unsigned int)time(NULL));
+		srand(benchmark.active ? 0 : ((unsigned int)time(NULL)));
 		uint32_t lighting_model = (int)(rand() % 4);
 
 		// Each shader constant of a shader stage corresponds to one map entry

examples/inlineuniformblocks/inlineuniformblocks.cpp

@@ -28,9 +28,9 @@ public:
 			float ambient;
 		} material;
 		VkDescriptorSet descriptorSet;
-		void setRandomMaterial() {
+		void setRandomMaterial(bool applyRandomSeed) {
 			std::random_device rndDevice;
-			std::default_random_engine rndEngine(rndDevice());
+			std::default_random_engine rndEngine(applyRandomSeed ? rndDevice() : 0);
 			std::uniform_real_distribution<float> rndDist(0.1f, 1.0f);
 			material.r = rndDist(rndEngine);
 			material.g = rndDist(rndEngine);
@@ -161,7 +161,7 @@ public:
 
 		// Setup random materials for every object in the scene
 		for (uint32_t i = 0; i < objects.size(); i++) {
-			objects[i].setRandomMaterial();
+			objects[i].setRandomMaterial(!benchmark.active);
 		}
 	}
 
@@ -342,7 +342,7 @@ public:
 	void updateMaterials() {
 		// Setup random materials for every object in the scene
 		for (uint32_t i = 0; i < objects.size(); i++) {
-			objects[i].setRandomMaterial();
+			objects[i].setRandomMaterial(!benchmark.active);
 		}
 
 		for (auto &object : objects) {

examples/pushconstants/pushconstants.cpp

@@ -64,7 +64,7 @@ public:
 	{
 		// Setup random colors and fixed positions for every sphere in the scene
 		std::random_device rndDevice;
-		std::default_random_engine rndEngine(rndDevice());
+		std::default_random_engine rndEngine(benchmark.active ? 0 : rndDevice());
 		std::uniform_real_distribution<float> rndDist(0.1f, 1.0f);
 		for (uint32_t i = 0; i < spheres.size(); i++) {
 			spheres[i].color = glm::vec4(rndDist(rndEngine), rndDist(rndEngine), rndDist(rndEngine), 1.0f);

examples/texture3d/texture3d.cpp

@@ -38,13 +38,13 @@ private:
 		return ((h & 1) == 0 ? u : -u) + ((h & 2) == 0 ? v : -v);
 	}
 public:
-	PerlinNoise()
+	PerlinNoise(bool applyRandomSeed)
 	{
 		// Generate random lookup for permutations containing all numbers from 0..255
 		std::vector<uint8_t> plookup;
 		plookup.resize(256);
 		std::iota(plookup.begin(), plookup.end(), 0);
-		std::default_random_engine rndEngine(std::random_device{}());
+		std::default_random_engine rndEngine(applyRandomSeed ? std::random_device{}() : 0);
 		std::shuffle(plookup.begin(), plookup.end(), rndEngine);
 
 		for (uint32_t i = 0; i < 256; i++)
@@ -89,16 +89,15 @@ template <typename T>
 class FractalNoise
 {
 private:
-	PerlinNoise<float> perlinNoise;
+	PerlinNoise<T> perlinNoise;
 	uint32_t octaves;
 	T frequency;
 	T amplitude;
 	T persistence;
 public:
-
-	FractalNoise(const PerlinNoise<T> &perlinNoise)
+	FractalNoise(const PerlinNoise<T> &perlinNoiseIn) :
+		perlinNoise(perlinNoiseIn)
 	{
-		this->perlinNoise = perlinNoise;
 		octaves = 6;
 		persistence = (T)0.5;
 	}
@@ -166,7 +165,7 @@ public:
 		camera.setPosition(glm::vec3(0.0f, 0.0f, -2.5f));
 		camera.setRotation(glm::vec3(0.0f, 15.0f, 0.0f));
 		camera.setPerspective(60.0f, (float)width / (float)height, 0.1f, 256.0f);
-		srand((unsigned int)time(NULL));
+		srand(benchmark.active ? 0 : (unsigned int)time(NULL));
 	}
 
 	~VulkanExample()
@@ -287,7 +286,7 @@ public:
 
 		auto tStart = std::chrono::high_resolution_clock::now();
 
-		PerlinNoise<float> perlinNoise;
+		PerlinNoise<float> perlinNoise(!benchmark.active);
 		FractalNoise<float> fractalNoise(perlinNoise);
 
 		const float noiseScale = static_cast<float>(rand() % 10) + 4.0f;

examples/texturesparseresidency/texturesparseresidency.cpp

@@ -714,7 +714,7 @@ void VulkanExample::fillRandomPages()
 {
 	vkDeviceWaitIdle(device);
 
-	std::default_random_engine rndEngine(std::random_device{}());
+	std::default_random_engine rndEngine(benchmark.active ? 0 : std::random_device{}());
 	std::uniform_real_distribution<float> rndDist(0.0f, 1.0f);
 
 	std::vector<VirtualTexturePage> updatedPages;
@@ -810,7 +810,7 @@ void VulkanExample::flushRandomPages()
 {
 	vkDeviceWaitIdle(device);
 
-	std::default_random_engine rndEngine(std::random_device{}());
+	std::default_random_engine rndEngine(benchmark.active ? 0 : std::random_device{}());
 	std::uniform_real_distribution<float> rndDist(0.0f, 1.0f);
 
 	std::vector<VirtualTexturePage> updatedPages;