mirror of
https://github.com/OpenTrespasser/JurassicParkTrespasser.git
synced 2024-12-24 09:31:56 +00:00
373 lines
10 KiB
C++
373 lines
10 KiB
C++
|
/**********************************************************************************************
|
|||
|
*
|
|||
|
* Copyright <EFBFBD> DreamWorks Interactive. 1996
|
|||
|
*
|
|||
|
* Contents:
|
|||
|
* Defines objects for walking through 1D and 2D surfaces.
|
|||
|
*
|
|||
|
* Bugs:
|
|||
|
*
|
|||
|
* To do:
|
|||
|
* Change the name of the module to 'TexWalk.hpp.'
|
|||
|
*
|
|||
|
**********************************************************************************************
|
|||
|
*
|
|||
|
* $Log:: /JP2_PC/Source/Lib/Renderer/Primitives/Walk.hpp $
|
|||
|
*
|
|||
|
* 13 98.09.19 12:39a Mmouni
|
|||
|
* Added "forceinline" to many small inline functions.
|
|||
|
* Inlined some functions for speed.
|
|||
|
*
|
|||
|
* 12 97/10/23 10:57a Pkeet
|
|||
|
* Added a K6 3D switch.
|
|||
|
*
|
|||
|
* 11 9/15/97 2:04p Mmouni
|
|||
|
* Now uses u4TextureTileMaskStepU so that tiling works without shifting.
|
|||
|
*
|
|||
|
* 10 7/07/97 11:53p Rwyatt
|
|||
|
* No includes headers that contain assembly code from the processor specific directories
|
|||
|
*
|
|||
|
* 9 1/15/97 1:02p Pkeet
|
|||
|
* Moved the assembly versions of the 2d initializing functions to WalkEx.hpp. Removed fog
|
|||
|
* parameters.
|
|||
|
*
|
|||
|
* 8 12/15/96 3:18p Pkeet
|
|||
|
* Added the 'InitializePos' function.
|
|||
|
*
|
|||
|
* 7 12/11/96 9:04p Pkeet
|
|||
|
* Added the inline function for assembly initialization of the CWalk2D class.
|
|||
|
*
|
|||
|
* 6 12/11/96 7:15p Pkeet
|
|||
|
* Initial assembly implementation of the initialize member function of CWalk2D.
|
|||
|
*
|
|||
|
* 5 12/11/96 5:26p Pkeet
|
|||
|
* Changing initializing parameters for the 2D walking from doubles to floats.
|
|||
|
*
|
|||
|
* 4 12/09/96 1:27p Pkeet
|
|||
|
* Added the dGet member function.
|
|||
|
*
|
|||
|
* 3 8/12/96 7:15p Pkeet
|
|||
|
* Added comments. Changed the 'SetData' member functions to 'Initialize.'
|
|||
|
*
|
|||
|
* 2 7/10/96 1:48p Pkeet
|
|||
|
* Added additional comments.
|
|||
|
*
|
|||
|
* 1 7/10/96 12:17p Pkeet
|
|||
|
* Initial implementation.
|
|||
|
*
|
|||
|
*********************************************************************************************/
|
|||
|
|
|||
|
#ifndef HEADER_LIB_RENDERER_PRIMITIVES_WALK_HPP
|
|||
|
#define HEADER_LIB_RENDERER_PRIMITIVES_WALK_HPP
|
|||
|
|
|||
|
|
|||
|
//
|
|||
|
// Includes.
|
|||
|
//
|
|||
|
#include "Config.hpp"
|
|||
|
#include "Lib/Types/BigFixed.hpp"
|
|||
|
|
|||
|
|
|||
|
// Global mask for tiling U integer step.
|
|||
|
extern uint32 u4TextureTileMaskStepU;
|
|||
|
|
|||
|
|
|||
|
//
|
|||
|
// Class definitions.
|
|||
|
//
|
|||
|
|
|||
|
//*********************************************************************************************
|
|||
|
//
|
|||
|
class CWalk1D
|
|||
|
//
|
|||
|
// A 64 bit fixed point type with an offset value and offset functions for the integer
|
|||
|
// portion. Simplifies walking through 2D texture maps when used with CWalk2D.
|
|||
|
//
|
|||
|
// Notes:
|
|||
|
// This class differs from the UBigFixed type in that instead of having an integer portion
|
|||
|
// representing units of one, its integer portion represents units of some arbitrary size.
|
|||
|
//
|
|||
|
// So, for example, in the UBigFixed type when a carry is generated in the fractional
|
|||
|
// portion as a result of addition, one is added to the integer portion. In the CWalk1D
|
|||
|
// type, when the fractional values generate a carry, an arbitrary amount is added to the
|
|||
|
// integer portion instead of a one.
|
|||
|
//
|
|||
|
// This type is a precursor to CWalk2D, an object which essentially encapsulates Michael
|
|||
|
// Abrash's trick to walking arbitrary-sized texture maps. For more information, consult
|
|||
|
// documentation for CWalk2D and for the '+=' overloaded operator associated with it.
|
|||
|
//
|
|||
|
// This class contains a 64 bit fixed point variable instead of being inherited from it
|
|||
|
// to prevent errors in its use.
|
|||
|
//
|
|||
|
//**************************************
|
|||
|
{
|
|||
|
public:
|
|||
|
|
|||
|
UBigFixed bfxValue; // 64 bit fixed point value as a base value.
|
|||
|
int iOffsetPerLine; // Units for the integer portion of the value.
|
|||
|
|
|||
|
public:
|
|||
|
|
|||
|
//*****************************************************************************************
|
|||
|
//
|
|||
|
forceinline void Initialize
|
|||
|
(
|
|||
|
float f,
|
|||
|
int i_offset_per_line
|
|||
|
)
|
|||
|
//
|
|||
|
// Sets the member variables of the class based on a floating-point value and a arbitrary
|
|||
|
// walk offset.
|
|||
|
//
|
|||
|
//**************************************
|
|||
|
{
|
|||
|
// Set the offset value.
|
|||
|
iOffsetPerLine = i_offset_per_line;
|
|||
|
|
|||
|
// Convert the floating point value to a 64 bit fixed point value.
|
|||
|
bfxValue = f;
|
|||
|
|
|||
|
// Set the integer portion of the value into offset units.
|
|||
|
bfxValue.i4Int *= i_offset_per_line;
|
|||
|
}
|
|||
|
|
|||
|
//*****************************************************************************************
|
|||
|
//
|
|||
|
forceinline CWalk1D operator-
|
|||
|
(
|
|||
|
) const
|
|||
|
//
|
|||
|
// Returns the negative this value.
|
|||
|
//
|
|||
|
// Notes:
|
|||
|
// The negative of a 64 bit value (ei., a 32.32 fixed point value) is found by
|
|||
|
// subtracting the value from 0. If the fractional component of the original value
|
|||
|
// is not zero, a borrow will be performed from the integer portion.
|
|||
|
//
|
|||
|
// This function approximates this behaviour by performing a one's complement on
|
|||
|
// the fractional portion of the value instead of a two's complement. A borrow will
|
|||
|
// always be performed on the integer portion. This function is therefore
|
|||
|
// not totally accurate, but it is fast. The loss of accuracy is negligible, however.
|
|||
|
//
|
|||
|
//**************************************
|
|||
|
{
|
|||
|
CWalk1D fw_return_val; // Return value.
|
|||
|
|
|||
|
// Copy the offset the return value.
|
|||
|
fw_return_val.iOffsetPerLine = iOffsetPerLine;
|
|||
|
|
|||
|
// Negate the integer portion and "borrow" the offset value.
|
|||
|
fw_return_val.bfxValue.i4Int = -bfxValue.i4Int - iOffsetPerLine;
|
|||
|
|
|||
|
// Perform a one's complement on the fractional value.
|
|||
|
fw_return_val.bfxValue.u4Frac = ~bfxValue.u4Frac;
|
|||
|
return fw_return_val;
|
|||
|
}
|
|||
|
|
|||
|
// Conversion to double.
|
|||
|
double dGet() const
|
|||
|
{
|
|||
|
double d_int = double(bfxValue.i4Int / iOffsetPerLine);
|
|||
|
double d_frac = double(bfxValue.u4Frac) * dFracMultiplier;
|
|||
|
return d_int + d_frac;
|
|||
|
}
|
|||
|
|
|||
|
};
|
|||
|
|
|||
|
|
|||
|
//*********************************************************************************************
|
|||
|
//
|
|||
|
class CWalk2D
|
|||
|
//
|
|||
|
// An object for walking through arbitrary-sized texture maps.
|
|||
|
//
|
|||
|
// Notes:
|
|||
|
// If the object represents a delta, iUVInt[1] represents the value to add to the integer
|
|||
|
// portion if there is no carry from the addition of the fractional portions, iUVInt[0]
|
|||
|
// represents the value to add if there is a carry.
|
|||
|
//
|
|||
|
// If the object represents an accumulative value, the integer portion is contained in
|
|||
|
// iUVInt[1], which represents the index into the bitmap being walked.
|
|||
|
//
|
|||
|
// For further information on how this class works, consult the notes associated with
|
|||
|
// the overloaded '+=' operator for this class.
|
|||
|
//
|
|||
|
//**************************************
|
|||
|
{
|
|||
|
|
|||
|
public:
|
|||
|
|
|||
|
int iUVInt[2]; // The integer components of the Walk object.
|
|||
|
uint uUFrac; // The U fractional component.
|
|||
|
uint uVFrac; // The V fractional component.
|
|||
|
|
|||
|
public:
|
|||
|
|
|||
|
//******************************************************************************************
|
|||
|
//
|
|||
|
// Constructors.
|
|||
|
//
|
|||
|
|
|||
|
forceinline CWalk2D
|
|||
|
(
|
|||
|
)
|
|||
|
{
|
|||
|
}
|
|||
|
|
|||
|
//*****************************************************************************************
|
|||
|
//
|
|||
|
forceinline CWalk2D
|
|||
|
(
|
|||
|
const UBigFixed& bfx_u, // The 'U' component.
|
|||
|
const CWalk1D& w1d_v // The 'V' component.
|
|||
|
)
|
|||
|
//
|
|||
|
// Constructs the CWalk2D object given two values.
|
|||
|
//
|
|||
|
//**************************************
|
|||
|
{
|
|||
|
Initialize(bfx_u, w1d_v);
|
|||
|
}
|
|||
|
|
|||
|
//*****************************************************************************************
|
|||
|
//
|
|||
|
forceinline CWalk2D
|
|||
|
(
|
|||
|
float f_u, // The 'U' component.
|
|||
|
float f_v, // The 'V' component.
|
|||
|
int i_width // The width of the texture map.
|
|||
|
)
|
|||
|
//
|
|||
|
// Constructs the CWalk2D object given two values.
|
|||
|
//
|
|||
|
//**************************************
|
|||
|
{
|
|||
|
// Don't use this bit of code just yet.
|
|||
|
//Assert(0);
|
|||
|
|
|||
|
Initialize(f_u, f_v, i_width);
|
|||
|
}
|
|||
|
|
|||
|
|
|||
|
//******************************************************************************************
|
|||
|
//
|
|||
|
// Member functions.
|
|||
|
//
|
|||
|
|
|||
|
//*****************************************************************************************
|
|||
|
//
|
|||
|
forceinline void Initialize
|
|||
|
(
|
|||
|
float f_u, // The 'U' component.
|
|||
|
float f_v, // The 'V' component.
|
|||
|
int i_width // The width of the texture map.
|
|||
|
)
|
|||
|
//
|
|||
|
// Sets the fractional and integer parts of the CWalk2D object.
|
|||
|
//
|
|||
|
//**************************************
|
|||
|
{
|
|||
|
// Don't use this bit of code just yet.
|
|||
|
//Assert(0);
|
|||
|
|
|||
|
UBigFixed bfx_u; // Fixed point version of 'u.'
|
|||
|
CWalk1D w1d_v; // Fixed point version of 'v.'
|
|||
|
|
|||
|
bfx_u = double(f_u);
|
|||
|
w1d_v.Initialize(double(f_v), i_width);
|
|||
|
|
|||
|
Initialize(bfx_u, w1d_v);
|
|||
|
}
|
|||
|
|
|||
|
//*****************************************************************************************
|
|||
|
//
|
|||
|
forceinline void Initialize
|
|||
|
(
|
|||
|
const UBigFixed& bfx_u, // The 'U' component.
|
|||
|
const CWalk1D& w1d_v // The 'V' component.
|
|||
|
)
|
|||
|
//
|
|||
|
// Sets the fractional and integer parts of the CWalk2D object.
|
|||
|
//
|
|||
|
//**************************************
|
|||
|
{
|
|||
|
// Set the U and V fractional values.
|
|||
|
// MSM: Masked to keep only 16 fractional bits becuase
|
|||
|
// some of the Pentium primitives utilize the low part of
|
|||
|
// the registers the fractional bits are kept in.
|
|||
|
uUFrac = bfx_u.u4Frac & 0xFFFF0000;
|
|||
|
uVFrac = w1d_v.bfxValue.u4Frac & 0xFFFF0000;
|
|||
|
|
|||
|
// Set the combined integer value, and generate a carry version.
|
|||
|
// U must be masked for tiled texture before being combined with V.
|
|||
|
iUVInt[1] = (bfx_u.i4Int & u4TextureTileMaskStepU) + w1d_v.bfxValue.i4Int;
|
|||
|
iUVInt[0] = iUVInt[1] + w1d_v.iOffsetPerLine;
|
|||
|
}
|
|||
|
|
|||
|
};
|
|||
|
|
|||
|
|
|||
|
//
|
|||
|
// Global functions.
|
|||
|
//
|
|||
|
|
|||
|
#if !VER_ASM
|
|||
|
|
|||
|
//*****************************************************************************************
|
|||
|
//
|
|||
|
forceinline void Initialize
|
|||
|
(
|
|||
|
CWalk2D& rw2d,
|
|||
|
float f_u, // The 'U' component.
|
|||
|
float f_v, // The 'V' component.
|
|||
|
int i_width // The width of the texture map.
|
|||
|
)
|
|||
|
//
|
|||
|
// Sets the fractional and integer parts of the CWalk2D object.
|
|||
|
//
|
|||
|
//**************************************
|
|||
|
{
|
|||
|
CWalk2D w2d(f_u, f_v, i_width);
|
|||
|
|
|||
|
rw2d = w2d;
|
|||
|
}
|
|||
|
|
|||
|
//*****************************************************************************************
|
|||
|
//
|
|||
|
forceinline void InitializePos
|
|||
|
(
|
|||
|
CWalk2D& rw2d,
|
|||
|
float f_u, // The 'U' component.
|
|||
|
float f_v, // The 'V' component.
|
|||
|
int i_width // The width of the texture map.
|
|||
|
)
|
|||
|
//
|
|||
|
// Sets the fractional and integer parts of the CWalk2D object.
|
|||
|
//
|
|||
|
//**************************************
|
|||
|
{
|
|||
|
Initialize(rw2d, f_u, f_v, i_width);
|
|||
|
}
|
|||
|
|
|||
|
#endif // !VER_ASM
|
|||
|
|
|||
|
|
|||
|
//
|
|||
|
// Optimized versions of overloaded functions.
|
|||
|
//
|
|||
|
//**********************************************************************************************
|
|||
|
#if TARGET_PROCESSOR == PROCESSOR_PENTIUM
|
|||
|
#include "Lib/Renderer/Primitives/P5/WalkEx.hpp"
|
|||
|
#elif TARGET_PROCESSOR == PROCESSOR_PENTIUMPRO
|
|||
|
#include "Lib/Renderer/Primitives/P6/WalkEx.hpp"
|
|||
|
#elif TARGET_PROCESSOR == PROCESSOR_K6_3D
|
|||
|
#include "Lib/Renderer/Primitives/AMDK6/WalkEx.hpp"
|
|||
|
#else
|
|||
|
#error Invalid [No] target processor specified
|
|||
|
#endif
|
|||
|
//**********************************************************************************************
|
|||
|
|
|||
|
|
|||
|
|
|||
|
#endif
|