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Fixed random seed when run in benchmark mode

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Refs #269
This commit is contained in:
saschawillems 2018-01-15 20:40:17 +01:00
parent cb32e2e89f
commit 5790f30c17
3 changed files with 8 additions and 13 deletions
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16
examples/instancing/instancing.cpp
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@ -94,7 +94,6 @@ public:
VulkanExample() : VulkanExampleBase(ENABLE_VALIDATION)
{
title = "Instanced mesh rendering";
srand(time(NULL));
zoom = -18.5f;
rotation = { -17.2f, -4.7f, 0.0f };
cameraPos = { 5.5f, -1.85f, 0.0f };
@ -437,22 +436,17 @@ public:
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.starfield));
}
float rnd(float range)
{
return range * (rand() / double(RAND_MAX));
}
void prepareInstanceData()
{
std::vector<InstanceData> instanceData;
instanceData.resize(INSTANCE_COUNT);
std::mt19937 rndGenerator(time(NULL));
std::mt19937 rndGenerator(benchmark.active ? 0 : (unsigned)time(NULL));
std::uniform_real_distribution<float> uniformDist(0.0, 1.0);
std::uniform_int_distribution<uint32_t> rndTextureIndex(0, textures.rocks.layerCount);
// Distribute rocks randomly on two different rings
for (auto i = 0; i < INSTANCE_COUNT / 2; i++)
{
for (auto i = 0; i < INSTANCE_COUNT / 2; i++) {
glm::vec2 ring0 { 7.0f, 11.0f };
glm::vec2 ring1 { 14.0f, 18.0f };
@ -464,7 +458,7 @@ public:
instanceData[i].pos = glm::vec3(rho*cos(theta), uniformDist(rndGenerator) * 0.5f - 0.25f, rho*sin(theta));
instanceData[i].rot = glm::vec3(M_PI * uniformDist(rndGenerator), M_PI * uniformDist(rndGenerator), M_PI * uniformDist(rndGenerator));
instanceData[i].scale = 1.5f + uniformDist(rndGenerator) - uniformDist(rndGenerator);
instanceData[i].texIndex = rnd(textures.rocks.layerCount);
instanceData[i].texIndex = rndTextureIndex(rndGenerator);
instanceData[i].scale *= 0.75f;
// Outer ring
@ -473,7 +467,7 @@ public:
instanceData[i + INSTANCE_COUNT / 2].pos = glm::vec3(rho*cos(theta), uniformDist(rndGenerator) * 0.5f - 0.25f, rho*sin(theta));
instanceData[i + INSTANCE_COUNT / 2].rot = glm::vec3(M_PI * uniformDist(rndGenerator), M_PI * uniformDist(rndGenerator), M_PI * uniformDist(rndGenerator));
instanceData[i + INSTANCE_COUNT / 2].scale = 1.5f + uniformDist(rndGenerator) - uniformDist(rndGenerator);
instanceData[i + INSTANCE_COUNT / 2].texIndex = rnd(textures.rocks.layerCount);
instanceData[i + INSTANCE_COUNT / 2].texIndex = rndTextureIndex(rndGenerator);
instanceData[i + INSTANCE_COUNT / 2].scale *= 0.75f;
}