Make FlatInput and YCbCrInput support taking in external OpenGL textures.

[movit] / flat_input.h

diff --git a/flat_input.h b/flat_input.h
index 495a36cbdc10f5be9f0d22484dc018cbbb236316..14f8df16b82c853a9ad7bcf8b05301789cc202a2 100644 (file)
--- a/flat_input.h
+++ b/flat_input.h
@@ -112,18 +112,40 @@ public:
                invalidate_pixel_data();
        }
 
+       // Tells the input to use the specific OpenGL texture as pixel data.
+       // This is useful if you want to share the same texture between multiple
+       // EffectChain instances, or if you somehow can get the data into a texture more
+       // efficiently than through a normal upload (e.g. a video codec decoding straight
+       // into a texture). Note that you are responsible for setting the right sampler
+       // parameters (e.g. clamp-to-edge) yourself, as well as generate any mipmaps
+       // if they are needed.
+       //
+       // NOTE: The input does not take ownership of this texture; you are responsible
+       // for releasing it yourself. In particular, if you call invalidate_pixel_data()
+       // or anything calling it, the texture will silently be removed from the input.
+       void set_texture_num(GLuint texture_num)
+       {
+               possibly_release_texture();
+               this->texture_num = texture_num;
+               this->owns_texture = false;
+       }
+
        virtual void inform_added(EffectChain *chain)
        {
                resource_pool = chain->get_resource_pool();
        }
 
 private:
+       // Release the texture if we have any, and it is owned by us.
+       void possibly_release_texture();
+
        ImageFormat image_format;
        MovitPixelFormat pixel_format;
        GLenum type;
        GLuint pbo, texture_num;
        int output_linear_gamma, needs_mipmaps;
        unsigned width, height, pitch;
+       bool owns_texture;
        const void *pixel_data;
        ResourcePool *resource_pool;
        bool fixup_swap_rb, fixup_red_to_grayscale;