--- /dev/null
+#ifndef _INPUT_H
+#define _INPUT_H 1
+
+#include "effect.h"
+#include "image_format.h"
+
+// An input is a degenerate case of an effect; it represents the picture data
+// that comes from the user. As such, it has zero “inputs” itself, and some of
+// the normal operations don't really make sense for it.
+class Input : public Effect {
+public:
+ Input(ImageFormat format, unsigned width, unsigned height);
+
+ unsigned num_inputs() const { return 0; }
+
+ // Create the texture itself. We cannot do this in the constructor,
+ // because we don't necessarily know all the settings (sRGB texture,
+ // mipmap generation) at that point.
+ void finalize();
+
+ std::string output_fragment_shader();
+
+ // Uploads the texture if it has changed since last time.
+ void set_gl_state(GLuint glsl_program_num, const std::string& prefix, unsigned *sampler_num);
+
+ // Tells the input where to fetch the actual pixel data. Note that if you change
+ // this data, you must either call set_pixel_data() again (using the same pointer
+ // is fine), or invalidate_pixel_data(). Otherwise, the texture won't be re-uploaded
+ // on subsequent frames.
+ void set_pixel_data(const unsigned char *pixel_data)
+ {
+ this->pixel_data = pixel_data;
+ invalidate_pixel_data();
+ }
+
+ void invalidate_pixel_data()
+ {
+ needs_update = true;
+ }
+
+ const unsigned char *get_pixel_data() const
+ {
+ return pixel_data;
+ }
+
+private:
+ ImageFormat image_format;
+ GLenum format;
+ GLuint texture_num;
+ bool needs_update;
+ int use_srgb_texture_format, needs_mipmaps;
+ unsigned width, height, bytes_per_pixel;
+ const unsigned char *pixel_data;
+};
+
+#endif // !defined(_INPUT_H)