#include "image_format.h"
#include "input.h"
+class EffectChain;
+class Phase;
+
+// A node in the graph; basically an effect and some associated information.
+class Node {
+public:
+ Effect *effect;
+ bool disabled;
+
+ // Edges in the graph (forward and backward).
+ std::vector<Node *> outgoing_links;
+ std::vector<Node *> incoming_links;
+
+private:
+ // Identifier used to create unique variables in GLSL.
+ std::string effect_id;
+
+ // If output goes to RTT (otherwise, none of these are set).
+ // The Phsae pointer is a but ugly; we should probably fix so
+ // that Phase takes other phases as inputs, instead of Node.
+ GLuint output_texture;
+ unsigned output_texture_width, output_texture_height;
+ Phase *phase;
+
+ // Used during the building of the effect chain.
+ ColorSpace output_color_space;
+ GammaCurve output_gamma_curve;
+
+ friend class EffectChain;
+};
+
+// A rendering phase; a single GLSL program rendering a single quad.
+struct Phase {
+ GLint glsl_program_num;
+ bool input_needs_mipmaps;
+
+ // Inputs are only inputs from other phases (ie., those that come from RTT);
+ // input textures are not counted here.
+ std::vector<Node *> inputs;
+
+ std::vector<Node *> effects; // In order.
+ unsigned output_width, output_height;
+};
+
class EffectChain {
public:
EffectChain(unsigned width, unsigned height);
}
Effect *add_effect(Effect *effect, const std::vector<Effect *> &inputs);
- // Similar to add_effect, but:
- //
- // * Does not insert any normalizing effects.
- // * Does not ask the effect to insert itself, so it won't work
- // with meta-effects.
- //
- // We should really separate out these two “sides” of Effect in the
- // type system soon.
- void add_effect_raw(Effect *effect, const std::vector<Effect *> &inputs);
-
void add_output(const ImageFormat &format);
void finalize();
}
}
-private:
- struct Phase;
-
- // A node in the graph; basically an effect and some associated information.
- struct Node {
- Effect *effect;
-
- // Identifier used to create unique variables in GLSL.
- std::string effect_id;
-
- // Edges in the graph (forward and backward).
- std::vector<Node *> outgoing_links;
- std::vector<Node *> incoming_links;
-
- // If output goes to RTT (otherwise, none of these are set).
- // The Phsae pointer is a but ugly; we should probably fix so
- // that Phase takes other phases as inputs, instead of Node.
- GLuint output_texture;
- unsigned output_texture_width, output_texture_height;
- Phase *phase;
-
- // Used during the building of the effect chain.
- ColorSpace output_color_space;
- GammaCurve output_gamma_curve;
- };
-
- // A rendering phase; a single GLSL program rendering a single quad.
- struct Phase {
- GLint glsl_program_num;
- bool input_needs_mipmaps;
-
- // Inputs are only inputs from other phases (ie., those that come from RTT);
- // input textures are not counted here.
- std::vector<Node *> inputs;
-
- std::vector<Node *> effects; // In order.
- unsigned output_width, output_height;
- };
+ // API for manipulating the graph directly. Intended to be used from
+ // effects and by EffectChain itself.
+ //
+ // Note that for nodes with multiple inputs, the order of calls to
+ // connect_nodes() will matter.
+ Node *add_node(Effect *effect);
+ void connect_nodes(Node *sender, Node *receiver);
+ void replace_receiver(Node *old_receiver, Node *new_receiver);
+ void replace_sender(Node *new_sender, Node *receiver);
+ void insert_node_between(Node *sender, Node *middle, Node *receiver);
+private:
// Determine the preferred output size of a given phase.
// Requires that all input phases (if any) already have output sizes set.
void find_output_size(Phase *phase);
- void find_all_nonlinear_inputs(Node *effect,
- std::vector<Node *> *nonlinear_inputs,
- std::vector<Node *> *intermediates);
- Node *normalize_to_linear_gamma(Node *input);
- Node *normalize_to_srgb(Node *input);
-
- void draw_vertex(float x, float y, const std::vector<Effect *> &inputs);
+ // Find all inputs eventually feeding into this effect that have
+ // output gamma different from GAMMA_LINEAR.
+ void find_all_nonlinear_inputs(Node *effect, std::vector<Node *> *nonlinear_inputs);
// Create a GLSL program computing the given effects in order.
Phase *compile_glsl_program(const std::vector<Node *> &inputs,
// that depends on it (whenever possible).
void construct_glsl_programs(Node *output);
+ // Output the current graph to the given file in a Graphviz-compatible format;
+ // only useful for debugging.
+ void output_dot(const char *filename);
+
+ // Some of the graph algorithms assume that the nodes array is sorted
+ // topologically (inputs are always before outputs), but some operations
+ // (like graph rewriting) can change that. This function restores that order.
+ void sort_nodes_topologically();
+ void topological_sort_visit_node(Node *node, std::set<Node *> *visited_nodes, std::vector<Node *> *sorted_list);
+
+ // Used during finalize().
+ void propagate_gamma_and_color_space();
+ Node *find_output_node();
+
+ bool node_needs_colorspace_fix(Node *node);
+ void fix_internal_color_spaces();
+ void fix_output_color_space();
+
+ bool node_needs_gamma_fix(Node *node);
+ void fix_internal_gamma_by_asking_inputs(unsigned step);
+ void fix_internal_gamma_by_inserting_nodes(unsigned step);
+ void fix_output_gamma();
+
unsigned width, height;
ImageFormat output_format;
bool finalized;
};
-
#endif // !defined(_EFFECT_CHAIN_H)
projects / movit / blobdiff