X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Feffects%2Fsky.h;fp=source%2Feffects%2Fsky.h;h=eb4f618d9607569bcdb32a9151a44ebf7442d8bd;hb=06d83c11e10208478487dea864ddd7822630c391;hp=0000000000000000000000000000000000000000;hpb=e98956208676c77e74462f17932ac530077a0540;p=libs%2Fgl.git

diff --git a/source/effects/sky.h b/source/effects/sky.h
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--- /dev/null
+++ b/source/effects/sky.h
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+#ifndef MSP_GL_SKY_H_
+#define MSP_GL_SKY_H_
+
+#include "effect.h"
+#include "framebuffer.h"
+#include "programdata.h"
+#include "texture2d.h"
+
+namespace Msp {
+namespace GL {
+
+class Mesh;
+class Light;
+class Program;
+
+/**
+Renders a procedurally generated sky at the background.  Based on the paper
+"A Scalable and Production Ready Sky and Atmosphere Rendering Technique" by
+Sébastien Hillaire (https://sebh.github.io/publications/egsr2020.pdf).
+*/
+class Sky: public Effect
+{
+public:
+	struct Planet
+	{
+		Color rayleigh_scatter;
+		Color mie_scatter;
+		Color mie_absorb;
+		Color ozone_absorb;
+		float rayleigh_density_decay;
+		float mie_density_decay;
+		float ozone_band_center;
+		float ozone_band_extent;
+		float atmosphere_thickness;
+		float planet_radius;
+		Color ground_albedo;
+
+		Planet();
+
+		static Planet earth();
+	};
+
+private:
+	const Light &sun;
+	Texture2D transmittance_lookup;
+	const Program &transmittance_shprog;
+	Framebuffer transmittance_fbo;
+	bool transmittance_lookup_dirty;
+	Texture2D distant;
+	const Program &distant_shprog;
+	Framebuffer distant_fbo;
+	const Mesh &fullscreen_mesh;
+	const Program &backdrop_shprog;
+	const Sampler &sampler;
+	const Sampler &wrap_sampler;
+	mutable ProgramData shdata;
+	bool rendered;
+
+public:
+	Sky(Resources &, Renderable &, const Light &);
+
+	void set_planet(const Planet &);
+	void set_view_height(float);
+
+	virtual void setup_frame(Renderer &);
+	virtual void finish_frame();
+	virtual void render(Renderer &, Tag = Tag()) const;
+};
+
+} // namespace GL
+} // namespace Msp
+
+#endif