Supermodel/Src/Graphics/New3D/PolyHeader.h

#ifndef _POLY_HEADER_H_
#define _POLY_HEADER_H_

namespace New3D {

/*
Polygon Data

0x00:
x------- -------- -------- --------		Specular enable
-xxxxx-- -------- -------- --------		?
------xx xxxxxxxx xxxxxx-- --------		Polygon number (not always present)
-------- -------- ------xx --------		Possibly disable z and colour writing
-------- -------- -------- -x------		0 = Triangle, 1 = Quad
-------- -------- -------- ----x---		Vertex 3 shared from previous polygon
-------- -------- -------- -----x--		Vertex 2 shared from previous polygon
-------- -------- -------- ------x-		Vertex 1 shared from previous polygon
-------- -------- -------- -------x		Vertex 0 shared from previous polygon
-------- -------- -------- x-xx----		?

0x01: 
xxxxxxxx xxxxxxxx xxxxxxxx--------		Polygon normal X coordinate(2.22 fixed point)
-------- -------- -------- -x------		UV scale (0 = 13.3, 1 = 16.0)
-------- -------- -------- ---x----		1 = Double-sided polygon
-------- -------- -------- -----x--		If set, this is the last polygon
-------- -------- -------- ------x-		Poly color, 1 = RGB, 0 = color table
-------- -------- -------- x-x-x--x		?

0x02: 
xxxxxxxx xxxxxxxx xxxxxxxx --------		Polygon normal Y coordinate(2.22 fixed point)
-------- -------- -------- ------x-		Texture U mirror enable
-------- -------- -------- -------x		Texture V mirror enable
-------- -------- -------- xxxxxx--		H/W also supports texture clamp/mirror, so guessing some of these bits must be that

0x03: 
xxxxxxxx xxxxxxxx xxxxxxxx --------		Polygon normal Z coordinate(2.22 fixed point)
-------- -------- -------- --xxx---		Texture width(in 8 - pixel tiles)
-------- -------- -------- ---- - xxx	Texture height(in 8 - pixel tiles)

0x04: 
xxxxxxxx xxxxxxxx xxxxxxxx --------		Color(RGB888)
-------- -------- -------- -x------		Texture page
-------- -------- -------- ---xxxxx		Upper 5 bits of texture U coordinate
-------- -------- -------- x-------		?
-------- -------- -------- --x-----		?

0x05 : 
xxxxxxxx xxxxxxxx xxxxxxxx --------		Specular color ?
-------- -------- -------- x-------		Low bit of texture U coordinate
-------- -------- -------- ---xxxxx		Low 5 bits of texture V coordinate
-------- -------- -------- -xx-----		?

0x06: 
x------- -------- -------- --------		Alpha testing / contour
-xxxxx-- -------- -------- --------		Fixed shading ?
------x- -------- -------- --------		Enable fixed shading ?
-------x -------- -------- --------		Possible stencil
-------- x------- -------- --------		1 = disable transparency ?
-------- -xxxxx-- -------- --------		Polygon translucency(0 = fully transparent)
-------- -------x -------- --------		1 = disable lighting
-------- -------- xxxxx--- --------		Polygon light modifier(Amount that a luminous polygon will burn through fog. Valid range is 0.0 to 1.0. 0.0 is completely fogged; 1.0 has no fog.)
-------- -------- -----x-- --------		Texture enable
-------- -------- ------xx x-------		Texture format
-------- -------- -------- -------x		Alpha enable ?
-------- ------x - ------- --------		Never seen set ?
-------- -------- -------- -----xx-		Always set ?
-------- -------- -------- -xxxx---		?
*/

class PolyHeader
{
public:
	PolyHeader();
	PolyHeader(UINT32* h);

	void operator =(const UINT32* h);

	UINT32*	StartOfData();
	bool	NextPoly();
	int		NumPolysTotal();		// could be quads or triangles
	int		NumTrianglesTotal();

	//header 0
	bool	Specular();
	int		PolyNumber();
	bool	Disabled();		// z & colour disabled
	int		NumVerts();
	int		NumSharedVerts();
	bool	SharedVertex(int vertex);

	//header 1
	void	FaceNormal(float n[3]);
	float	UVScale();
	bool	DoubleSided();
	bool	LastPoly();
	bool	PolyColor();	// if false uses LUT from ram

	//header 2
	bool	TexUMirror();
	bool	TexVMirror();

	// header 3
	int		TexWidth();
	int		TexHeight();

	//header 4
	void	Color(UINT8& r, UINT8& g, UINT8& b);
	int		Page();

	// header 5
	int		X(int textureXOffset);
	int		Y(int textureYOffset);

	//header 6
	int		TexFormat();
	bool	TexEnabled();
	bool	LightEnabled();
	bool	AlphaTest();
	UINT8	Transparency();			// 0-255
	bool	FixedShading();
	UINT8	ShadeValue();
	bool	PolyAlpha();
	bool	TextureAlpha();
	bool	StencilPoly();
	bool	Luminous();
	float	LightModifier();

	// misc
	UINT64	Hash(int textureXOffset, int textureYOffset);		// make a unique hash for sorting by state


	//=============
	UINT32* header;
	//=============
};

} // New3D

#endif