DD::Image::VertexContext Class Reference

Public Types
typedef void(*	TextureSampler) (Iop *material, const Vector2 &center, const Vector2 &dU, const Vector2 &dV, TextureFilter *f, Pixel &out, void *context)

Public Member Functions
	VertexContext (const VertexContext &vtx)
Scene *	scene () const
void	set_scene (Scene *s)
const GeoInfo *	geoinfo () const
void	set_geoinfo (const GeoInfo *g)
const Primitive *	primitive () const
void	set_primitive (const Primitive *p)
const GeoInfoRenderState *	get_renderstate () const
void	set_renderstate (const GeoInfoRenderState *r)
rPrimitive *	rprimitive () const
void	set_rprimitive (rPrimitive *rp)
Iop *	rmaterial () const
void	set_rmaterial (Iop *m)
Box3 &	face_uv_bbox ()
unsigned &	face_clipmask ()
void	set_transforms (MatrixArray *m)
MatrixArray *	transforms () const
const Matrix4 &	matrix (int n) const
const Matrix4 &	inverse_matrix (int n) const
PrimitiveTestCache *	ray_test_cache () const
void	set_ray_test_cache (PrimitiveTestCache *r)
TextureSampler	texture_sampler () const
void	set_texture_sampler (TextureSampler t)
Vector4 &	P () const
Vector4 &	dPdu () const
Vector4 &	dPdv () const
float	x () const
float	y () const
float	z () const
float	w () const
Vector3 &	PL () const
Vector3 &	dPLdu () const
Vector3 &	dPLdv () const
Vector3 &	PW () const
Vector3 &	dPWdu () const
Vector3 &	dPWdv () const
Vector3 &	MB () const
Vector3 &	dMBdu () const
Vector3 &	dMBdv () const
Vector4 &	UV () const
Vector4 &	dUVdu () const
Vector4 &	dUVdv () const
Vector3 &	N () const
Vector3 &	dNdu () const
Vector3 &	dNdv () const
Vector4 &	Cf () const
Vector4 &	dCfdu () const
Vector4 &	dCfdv () const
float	r () const
float	g () const
float	b () const
float	a () const
Vector3 &	VEL () const
Vector3 &	dVELdu () const
Vector3 &	dVELdv () const
void	sample (Iop *material, Pixel &out) const

Public Attributes
VArray	vP
	Current values for fragment_shader.
VArray	vdX
	Change if X of render pixel is increased by 1.
VArray	vdY
	Change if Y of render pixel is increased by 1.
Vector3	ambient
	Global ambient setting.
Iop *	blending_shader
bool	texture_sampling
void *	render_context

Detailed Description

This class is intended to be passed up a vertex shader tree. It's initialized with basic vertex info like the point location, a UV coordinate and a normal. A shader can then modify the parameters producing effects like point displacement, UV projection, and normal remapping.

Member Typedef Documentation

typedef void(* DD::Image::VertexContext::TextureSampler) (Iop *material, const Vector2 &center, const Vector2 &dU, const Vector2 &dV, TextureFilter *f, Pixel &out, void *context)

Callback to redefine the texture sampler

Member Function Documentation

void VertexContext::sample	(	Iop *	material,
		Pixel &	out
	)		const

Use the UV and the derivatives of UV to sample the incoming image. UV of 0,0 is mapped to the lower-left corner of the image's format, and 1,1 is mapped to the upper-right corner.

References DD::Image::IopInfoOwner::channels(), DD::Image::ChannelSet::contains(), DD::Image::IopInfoOwner::format(), DD::Image::Box::h(), DD::Image::Iop::sample(), DD::Image::Box::w(), DD::Image::Box::x(), and DD::Image::Box::y().

Referenced by DD::Image::Render::draw_primitives(), and DD::Image::Iop::fragment_shader().

Member Data Documentation

Iop* DD::Image::VertexContext::blending_shader

Points at the final shader in the chain.

Referenced by DD::Image::Iop::fragment_shader(), DD::Image::Render::Span::initialize(), and DD::Image::Material::set_blending_shader().

bool DD::Image::VertexContext::texture_sampling

Whether shaders should sample their textures.

Referenced by DD::Image::Iop::fragment_shader(), and DD::Image::Render::Span::initialize().