X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=effect.h;h=ef58392715ea7ade816bfc440c1eec65bd3ee410;hp=d14176b2b1f4dc5f74f56388766cdfb2d5d14362;hb=24660d2111d0ee97228016a7072304ff657d297b;hpb=a93b0c94f68bf897adfdca95b292494497fa4f7f

diff --git a/effect.h b/effect.h
index d14176b..ef58392 100644
--- a/effect.h
+++ b/effect.h
@@ -14,9 +14,12 @@
 #include <string>
 #include <vector>
 
-#include <GL/gl.h>
+#include <assert.h>
+
+#include "opengl.h"
 
 class EffectChain;
+class Node;
 
 // Can alias on a float[2].
 struct Point2D {
@@ -44,7 +47,12 @@ void set_uniform_vec3(GLuint glsl_program_num, const std::string &prefix, const
 void set_uniform_vec4_array(GLuint glsl_program_num, const std::string &prefix, const std::string &key, const float *values, size_t num_values);
 
 class Effect {
-public: 
+public:
+	// An identifier for this type of effect, mostly used for debug output
+	// (but some special names, like "ColorSpaceConversionEffect", holds special
+	// meaning). Same as the class name is fine.
+	virtual std::string effect_type_id() const = 0;
+
 	// Whether this effects expects its input (and output) to be in
 	// linear gamma, ie. without an applied gamma curve. Most effects
 	// will want this, although the ones that never actually look at
@@ -96,16 +104,39 @@ public:
 	// needs mipmaps, you will also get them).
 	virtual bool needs_mipmaps() const { return false; }
 
+	// Whether this effect wants to output to a different size than
+	// its input(s). If you set this to true, the output will be
+	// bounced to a texture (similarly to if the next effect set
+	// needs_texture_bounce()).
+	virtual bool changes_output_size() const { return false; }
+
+	// If changes_output_size() is true, you must implement this to tell
+	// the framework what output size you want.
+	//
+	// Note that it is explicitly allowed to change width and height
+	// from frame to frame; EffectChain will reallocate textures as needed.
+	virtual void get_output_size(unsigned *width, unsigned *height) const {
+		assert(false);
+	}
+
 	// How many inputs this effect will take (a fixed number).
 	// If you have only one input, it will be called INPUT() in GLSL;
 	// if you have several, they will be INPUT1(), INPUT2(), and so on.
 	virtual unsigned num_inputs() const { return 1; }
 
-	// Requests that this effect adds itself to the given effect chain.
-	// For most effects, the default will be fine, but for effects that
-	// consist of multiple passes, it is often useful to replace this
-	// with something that adds completely different things to the chain.
-	virtual void add_self_to_effect_chain(EffectChain *graph, const std::vector<Effect *> &inputs);
+	// Let the effect rewrite the effect chain as it sees fit.
+	// Most effects won't need to do this, but this is very useful
+	// if you have an effect that consists of multiple sub-effects
+	// (for instance, two passes). The effect is given to its own
+	// pointer, and it can add new ones (by using add_node()
+	// and connect_node()) as it sees fit. This is called at
+	// EffectChain::finalize() time, when the entire graph is known,
+	// in the order that the effects were originally added.
+	//
+	// Note that if the effect wants to take itself entirely out
+	// of the chain, it must set “disabled” to true and then disconnect
+	// itself from all other effects.
+	virtual void rewrite_graph(EffectChain *graph, Node *self) {}
 
 	// Outputs one GLSL uniform declaration for each registered parameter
 	// (see below), with the right prefix prepended to each uniform name.