Adding ViroKit. Needs AWSCore :(

mobile/ios/ViroKit.framework/Headers/VROParticleUBO.h

@@ -0,0 +1,91 @@
+//
+//  VROParticleUBO.h
+//  ViroRenderer
+//
+//  Copyright © 2017 Viro Media. All rights reserved.
+//
+
+#ifndef VROParticleUBO_h
+#define VROParticleUBO_h
+
+#include "VROInstancedUBO.h"
+
+static const int kMaxParticlesPerUBO = 180;
+static const int kMaxFloatsPerTransform = 16;
+static const int kMaxFloatsPerColor = 4;
+
+/*
+ Uniform buffer object structure format through which particle transform data are batched
+ into the Vertex shader. Data is grouped in 4N slots, matching layout specified
+ in particle_vsh.glsl.
+ */
+typedef struct {
+    float particles_transform[kMaxParticlesPerUBO * kMaxFloatsPerTransform];
+} VROParticlesUBOVertexData;
+
+/*
+ Uniform buffer object structure format through which particle "appearance" data are
+ batched into the Fragment shader. Data is grouped in 4N slots, matching layout specified
+ in particle_fsh.glsl.
+ */
+typedef struct {
+    float frag_particles_color[kMaxParticlesPerUBO * kMaxFloatsPerColor];
+} VROParticlesUBOFragmentData;
+
+class VROParticle;
+
+/*
+ VROParticleUBO handles the binding and batching of particle information into the vertex
+ and fragment shaders for instance rendering. Note that any instance of a given VROParticleUBO
+ will always bind data to the same uniform buffers (Binding Point and Buffer ID).
+ */
+class VROParticleUBO : public VROInstancedUBO {
+public:
+    VROParticleUBO(std::shared_ptr<VRODriver> driver);
+    virtual ~VROParticleUBO();
+
+    void bind();
+    std::vector<std::shared_ptr<VROShaderModifier>> createInstanceShaderModifier();
+
+    /*
+     Returns number of glDraw(s) required to instance draw all the particles represented
+     by this VROParticleUBO.
+     */
+    int getNumberOfDrawCalls();
+
+    /*
+     Binds all VROParticlesUBOVertexData and VROParticlesUBOFragmentData to its corresponding
+     vertex and fragment uniform buffers so that they can be referred to and processed
+     by shader modifiers crated with createInstanceShaderModifier().
+     */
+    int bindDrawData(int currentDrawCallIndex);
+
+    /*
+     Update the data in this UBO with the latest list of instanced particle data
+     like transformation matrix / color.
+     */
+    void update(std::vector<VROParticle> &particles, VROBoundingBox &box);
+
+    /*
+     Returns a bounding box that encapsulates all _lastKnownParticles.
+     */
+    VROBoundingBox getInstancedBoundingBox();
+    
+private:
+
+    /*
+     Buffer IDs representing the Uniform Buffer objects that were generated for this
+     UBO.
+     */
+    GLuint _particleVertexUBO;
+    GLuint _particleFragmentUBO;
+
+    /*
+     The driver that created this UBO.
+     */
+    std::weak_ptr<VRODriver> _driver;
+    std::vector<VROParticle> _lastKnownParticles;
+    VROBoundingBox _lastKnownBoundingBox;
+};
+
+#endif /* VROParticleUBO_h */