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/*
* PARSEC HEADER (OBJECT)
* Rasterization Types V1.70
*
* Copyright (c) Markus Hadwiger 1995-1999
* All Rights Reserved.
*/
#ifndef _OD_RAST_H_
#define _OD_RAST_H_
// coordinate on actual screen (integral component on the integer lattice) ----
//
typedef dword ugrid_t; // unsigned!
typedef int32_t sgrid_t; // signed!
typedef rastv_t fgrid_t;
// 2-D point in unsigned integer coordinates (always >= 0) --------------------
//
struct UPoint {
ugrid_t X; // unsigned!
ugrid_t Y; // unsigned!
};
// 2-D point in screen coordinates (used in vertex list for the edge tracer) --
//
struct SPoint {
sgrid_t X; // signed!
sgrid_t Y; // signed!
};
// extended version of SPoint structure; contains z and color info ------------
//
struct SPointEx {
sgrid_t X; // signed!
sgrid_t Y; // signed!
depth_t View_Z; // Z coordinate in view space (for buffer fill)
dword RGBA; // RGBA color (8-bit channels)
};
// 2-D point in screen coordinates with fractional part -----------------------
//
struct FPoint {
fgrid_t X; // 8 bytes
fgrid_t Y;
};
// defines a polygon that should by rendered and drawn to the screen; ---------
// created after projection of 3-D polygon; scaled to screen coordinates;
// used only by edge tracer (must be filled from the object structure)
//
struct SVertexList {
dword VCount; // number of vertices in list
SPoint Vertices[ 1 ]; // first element of vertex list (array)
};
// list of extended SPoints ---------------------------------------------------
//
struct SVertexExList {
dword VCount; // number of vertices in list
SPointEx Vertices[ 1 ]; // first element of vertex list (array)
};
// defines single horizontal span; used for horizontal span list structure ----
// the span starts at XLeft and ends at XRight (inclusively)
//
struct HSpan {
ugrid_t XLeft; // size is 8 bytes
ugrid_t XRight;
};
// extended version of HSpan structure; contains z and lighting info ----------
//
struct HSpanEx {
ugrid_t XLeft; // size is 16 bytes
ugrid_t XRight;
word ZLeft;
word ILeft;
word ZRight;
word IRight;
};
// stores list of horizontal spans; created by polygon edge-tracer; -----------
// used by low level polygon drawing/rendering functions
//
struct HSpanList {
dword Height; // length of list (height of bounding rectangle)
ugrid_t TopY; // lowest y coordinate of polygon vertices
HSpan HSpans[ 1 ]; // first element of horizontal span list (array)
};
// list of extended HSpans ----------------------------------------------------
//
struct HSpanExList {
dword Height; // length of list (height of bounding rectangle)
ugrid_t TopY; // lowest y coordinate of polygon vertices
HSpanEx HSpans[ 1 ]; // first element of horizontal span list (array)
};
#endif // _OD_RAST_H_
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