Split inputs into a separate class (descending from Effect) instead of handling them...

[movit] / input.h

diff --git a/input.h b/input.h
new file mode 100644 (file)
index 0000000..dd80bb6
--- /dev/null
+++ b/input.h
@@ -0,0 +1,56 @@
+#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)