#ifndef _EFFECT_CHAIN_H
#define _EFFECT_CHAIN_H 1
+#include <set>
#include <vector>
#include "effect.h"
#include "effect_id.h"
-
-enum PixelFormat { FORMAT_RGB, FORMAT_RGBA };
-
-enum ColorSpace {
- COLORSPACE_sRGB = 0,
- COLORSPACE_REC_709 = 0, // Same as sRGB.
- COLORSPACE_REC_601_525 = 1,
- COLORSPACE_REC_601_625 = 2,
-};
-
-enum GammaCurve {
- GAMMA_LINEAR = 0,
- GAMMA_sRGB = 1,
- GAMMA_REC_601 = 2,
- GAMMA_REC_709 = 2, // Same as Rec. 601.
-};
-
-struct ImageFormat {
- PixelFormat pixel_format;
- ColorSpace color_space;
- GammaCurve gamma_curve;
-};
+#include "image_format.h"
+#include "input.h"
class EffectChain {
public:
EffectChain(unsigned width, unsigned height);
- void add_input(const ImageFormat &format);
- // The pointer is owned by EffectChain.
- Effect *add_effect(EffectId effect);
+ // User API:
+ // input, effects, output, finalize need to come in that specific order.
+
+ Input *add_input(const ImageFormat &format);
+
+ // The returned pointer is owned by EffectChain.
+ Effect *add_effect(EffectId effect) {
+ return add_effect(effect, last_added_effect());
+ }
+ Effect *add_effect(EffectId effect, Effect *input) {
+ std::vector<Effect *> inputs;
+ inputs.push_back(input);
+ return add_effect(effect, inputs);
+ }
+ Effect *add_effect(EffectId effect, Effect *input1, Effect *input2) {
+ std::vector<Effect *> inputs;
+ inputs.push_back(input1);
+ inputs.push_back(input2);
+ return add_effect(effect, inputs);
+ }
+ Effect *add_effect(EffectId 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();
+
+ //void render(unsigned char *src, unsigned char *dst);
+ void render_to_screen();
- void render(unsigned char *src, unsigned char *dst);
+ Effect *last_added_effect() {
+ if (effects.empty()) {
+ return NULL;
+ } else {
+ return effects.back();
+ }
+ }
private:
+ struct Phase {
+ GLint glsl_program_num;
+ bool input_needs_mipmaps;
+ std::vector<Effect *> inputs; // Only from other phases; input textures are not counted here.
+ std::vector<Effect *> effects; // In order.
+ };
+
+ void set_use_srgb_texture_format(Effect *effect);
+ Effect *normalize_to_linear_gamma(Effect *input);
+ Effect *normalize_to_srgb(Effect *input);
+
+ void draw_vertex(float x, float y, const std::vector<Effect *> &inputs);
+
+ // Create a GLSL program computing the given effects in order.
+ Phase compile_glsl_program(const std::vector<Effect *> &inputs, const std::vector<Effect *> &effects);
+
+ // Create all GLSL programs needed to compute the given effect, and all outputs
+ // that depends on it (whenever possible).
+ void construct_glsl_programs(Effect *output);
+
unsigned width, height;
- ImageFormat input_format, output_format;
+ ImageFormat output_format;
std::vector<Effect *> effects;
+ std::vector<Input *> inputs; // Also contained in effects.
+ std::map<Effect *, std::string> effect_ids;
+ std::map<Effect *, GLuint> effect_output_textures;
+ std::map<Effect *, std::vector<Effect *> > outgoing_links;
+ std::map<Effect *, std::vector<Effect *> > incoming_links;
+
+ GLuint fbo;
+ std::vector<Phase> phases;
+
+ GLenum format, bytes_per_pixel;
+ bool finalized;
- ColorSpace current_color_space;
- GammaCurve current_gamma_curve;
+ // Used during the building of the effect chain.
+ std::map<Effect *, ColorSpace> output_color_space;
+ std::map<Effect *, GammaCurve> output_gamma_curve;
};