+// Public so that it can be benchmarked externally.
+template<class T>
+struct Tap {
+ T weight;
+ T pos;
+};
+struct ScalingWeights {
+ unsigned src_bilinear_samples;
+ unsigned dst_samples, num_loops;
+
+ // Exactly one of these is set.
+ std::unique_ptr<Tap<fp16_int_t>[]> bilinear_weights_fp16;
+ std::unique_ptr<Tap<float>[]> bilinear_weights_fp32;
+};
+ScalingWeights calculate_scaling_weights(unsigned src_size, unsigned dst_size, float zoom, float offset);
+
+// A simple manager for support data stored in a 2D texture.
+// Consider moving it to a shared location of more classes
+// should need similar functionality.
+class Support2DTexture {
+public:
+ Support2DTexture();
+ ~Support2DTexture();
+
+ void update(GLint width, GLint height, GLenum internal_format, GLenum format, GLenum type, const GLvoid * data);
+ GLint get_texnum() const { return texnum; }
+
+private:
+ GLuint texnum = 0;
+ GLint last_texture_width = -1, last_texture_height = -1;
+ GLenum last_texture_internal_format = GL_INVALID_ENUM;
+};
+