DD::Image::Render::Span Class Reference

Public Member Functions
	Span (const Span &s)
Span &	operator= (const Span &s)
void	initialize (Scene *scene, rPrimitive *p, int Y)
const Primitive *	primitive () const
rPrimitive *	rprimitive () const

Public Attributes
VertexContext	vtx
	Argument for Iop::fragment_shader()
VArray	vX
	Value for vtx.vP at x==0.
int	x
int	r
	Range of pixels the primitive intersects.
bool	always_hit
	Used by antialiasing.
bool	never_hit
	Used by antialiasing.

Detailed Description

A Span represents the intersection of an rPrimitive with a scan line, the Render op uses these in it's implementation. The rPrimitive::intersect_scanline() method fills this in. This is the thread-safe part of the rendering system so one of these spans exist for each thread that's working on a primitive.

Member Function Documentation

void Render::Span::initialize	(	Scene *	scene,
		rPrimitive *	p,
		int	Y
	)

Call the rPrimitive::intersect_scanline and otherwise setup.

References always_hit, DD::Image::Scene::ambient, DD::Image::VertexContext::ambient, DD::Image::VertexContext::blending_shader, never_hit, r, DD::Image::VertexContext::texture_sampling, DD::Image::VertexContext::vdX, DD::Image::VertexContext::vdY, DD::Image::VertexContext::vP, vtx, and vX.

Referenced by DD::Image::Render::draw_primitives().

const Primitive* DD::Image::Render::Span::primitive ( ) const

inline

Return the parent primitive stored in the VertexContext.

rPrimitive* DD::Image::Render::Span::rprimitive ( ) const

inline

Return the render primitive stored in the VertexContext.

Referenced by DD::Image::Render::draw_primitives().