gfx/gl/shadowStenciller.h


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#pragma once

#include "gfx/gl/program.h"
#include "gfx/models/mesh.h"
#include "gfx/models/texture.h"
#include "glArrays.h"

class LightDirection;

class ShadowStenciller {
public:
	template<typename T> static constexpr T STENCIL_ANGLES = 8;

	ShadowStenciller();

	[[nodiscard]]
	static glTexture createStencilTexture(GLsizei width, GLsizei height);
	void setLightDirection(const LightDirection & lightDir);
	[[nodiscard]] Direction2D getLightDirection() const;
	void renderStencil(const glTexture &, const MeshBase &, Texture::AnyPtr texture) const;

private:
	glFrameBuffer fbo;
	Program shadowCaster;
	Program::RequiredUniformLocation viewProjectionLoc {shadowCaster, "viewProjection"};

	Direction2D lightDir;
	std::array<glm::mat4, STENCIL_ANGLES<size_t>> viewProjections;
};