From 94217187eb2785939458f08d96c7b1b9e55439ab Mon Sep 17 00:00:00 2001
From: Julian T <julian@jtle.dk>
Date: Sun, 17 Jan 2021 00:09:15 +0100
Subject: Minor changed and draft for random sampling

---
 src/sampling/random.cpp  | 13 ++++++++++++
 src/sampling/random.hpp  | 18 +++++++++++++++++
 src/sampling/sampler.cpp | 10 ++++++++++
 src/sampling/sampler.hpp | 52 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 93 insertions(+)
 create mode 100644 src/sampling/random.cpp
 create mode 100644 src/sampling/random.hpp
 create mode 100644 src/sampling/sampler.cpp
 create mode 100644 src/sampling/sampler.hpp

(limited to 'src/sampling')

diff --git a/src/sampling/random.cpp b/src/sampling/random.cpp
new file mode 100644
index 0000000..d77e78a
--- /dev/null
+++ b/src/sampling/random.cpp
@@ -0,0 +1,13 @@
+#include "random.hpp"
+
+RandomSampler::RandomSampler(long samples, int seed)
+    : Sampler(samples), m_rng(seed) {}
+
+double RandomSampler::getSample() {
+    return m_rng.getDouble();
+}
+
+Vec2d RandomSampler::get2dSample() {
+    return Vec2d(m_rng.getDouble(), m_rng.getDouble());
+}
+
diff --git a/src/sampling/random.hpp b/src/sampling/random.hpp
new file mode 100644
index 0000000..d1acaa8
--- /dev/null
+++ b/src/sampling/random.hpp
@@ -0,0 +1,18 @@
+#ifndef SAMPLER_RANDOM_H
+#define SAMPLER_RANDOM_H
+
+#include "sampler.hpp"
+#include <core/random.hpp>
+
+class RandomSampler : public Sampler {
+    public:
+        RandomSampler(long samples, int seed = 0);
+
+        double getSample();
+        Vec2d get2dSample();
+
+    private:
+        Random m_rng;
+};
+
+#endif
diff --git a/src/sampling/sampler.cpp b/src/sampling/sampler.cpp
new file mode 100644
index 0000000..d960816
--- /dev/null
+++ b/src/sampling/sampler.cpp
@@ -0,0 +1,10 @@
+#include "sampler.hpp"
+
+void Sampler::startPixel(const Vec2d &p) {
+    m_curPixel = p;
+    m_curPixelSampleIndex = 0;
+}
+
+bool Sampler::startNextSample() {
+    return ++m_curPixelSampleIndex < m_sampleCount;
+}
diff --git a/src/sampling/sampler.hpp b/src/sampling/sampler.hpp
new file mode 100644
index 0000000..cd52421
--- /dev/null
+++ b/src/sampling/sampler.hpp
@@ -0,0 +1,52 @@
+#ifndef SAMPLER_H
+#define SAMPLER_H
+
+#include <core/vector.hpp>
+
+#include <memory>
+
+static const double LargestBelowOne = 0x1.fffffffffffffp-1;
+
+class Sampler {
+    public:
+        Sampler(long sampleCount) : m_sampleCount(sampleCount) {}
+
+        /** @brief Start a new pixel sample
+         *
+         * Some samplers might find it usefull to get the position 
+         */
+        void startPixel(const Vec2d &p);
+
+        /** @brief Called by renderers when a new sample begins 
+         *
+         * @return Whether this is the last sample
+         */
+        bool startNextSample();
+
+        /** @brief Get a single sample */
+        virtual double getSample() = 0;
+
+        /** @brief Get a 2d sample
+         *
+         * Algorithms can optimize for getting 2d samples
+         */
+        virtual Vec2d get2dSample() = 0;
+
+        /** @brief Clones the sampler
+         *
+         * Usefull when multiple threads need a sampler.
+         * 
+         * @param seed Seed to set in cloned sampler
+         */
+        virtual std::unique_ptr<Sampler> clone(int seed) = 0;
+
+        const long m_sampleCount;
+
+    protected:
+        Vec2d m_curPixel;
+        long m_curPixelSampleIndex;
+
+};
+
+
+#endif
-- 
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