add texture methods (including unproject)

thermion_dart/native/include/UnprojectTexture.hpp

@@ -0,0 +1,39 @@
+#include <filament/Engine.h>
+#include <filament/Camera.h>
+#include <filament/Texture.h>
+#include <filament/VertexBuffer.h>
+#include <filament/IndexBuffer.h>
+#include <filament/RenderableManager.h>
+#include <filament/TransformManager.h>
+#include <math/mat4.h>
+#include <math/vec2.h>
+#include <math/vec3.h>
+#include <math/vec4.h>
+#include <utils/EntityManager.h>
+#include <backend/PixelBufferDescriptor.h>
+
+#include <vector>
+#include <algorithm>
+
+#include "CustomGeometry.hpp"
+
+namespace thermion_filament {
+
+class UnprojectTexture {
+public:
+    UnprojectTexture(const CustomGeometry * geometry, Camera& camera, Engine* engine)
+        : _geometry(geometry), _camera(camera), _engine(engine) {}
+
+    void unproject(utils::Entity entity, const uint8_t* inputTexture, uint8_t* outputTexture, uint32_t inputWidth, uint32_t inputHeight,
+                       uint32_t outputWidth, uint32_t outputHeight);
+
+private:
+    const CustomGeometry * _geometry;
+    const Camera& _camera;
+    Engine* _engine;
+
+    math::float3 doUnproject(const math::float2& screenPos, float depth, const math::mat4& invViewProj);
+    bool isInsideTriangle(const math::float2& p, const math::float2& a, const math::float2& b, const math::float2& c);
+    math::float3 barycentric(const math::float2& p, const math::float2& a, const math::float2& b, const math::float2& c);
+};
+}