mirror of
https://github.com/OpenTrespasser/JurassicParkTrespasser.git
synced 2024-12-25 10:01:56 +00:00
84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
|
/***********************************************************************************************
|
|||
|
|
*
|
|||
|
|
* Copyright <EFBFBD> DreamWorks Interactive. 1996
|
|||
|
|
*
|
|||
|
|
* Contents:
|
|||
|
|
* Assembly functions for fast bumpmapping.
|
|||
|
|
*
|
|||
|
|
* Notes:
|
|||
|
|
*
|
|||
|
|
* To Do:
|
|||
|
|
*
|
|||
|
|
***********************************************************************************************
|
|||
|
|
*
|
|||
|
|
* $Log:: /JP2_PC/source/Lib/Renderer/Primitives/P5/FastBumpEx.hpp $
|
|||
|
|
*
|
|||
|
|
* 5 1/19/98 7:30p Pkeet
|
|||
|
|
* Added support for 16 bit bumpmaps by adding lower colour resolution and a smaller size for
|
|||
|
|
* 'CBumpAnglePair.'
|
|||
|
|
*
|
|||
|
|
* 4 9/01/97 8:03p Rwyatt
|
|||
|
|
*
|
|||
|
|
* 3 9/24/96 2:56p Pkeet
|
|||
|
|
* Removed the overloaded '+' operator assembly function.
|
|||
|
|
*
|
|||
|
|
* 2 9/11/96 11:35a Pkeet
|
|||
|
|
* Added explicit references (dword ptr's) to assembly operations involving the angle pair
|
|||
|
|
* format.
|
|||
|
|
*
|
|||
|
|
* 1 9/06/96 2:50p Pkeet
|
|||
|
|
* Initial implementation.
|
|||
|
|
*
|
|||
|
|
**********************************************************************************************/
|
|||
|
|
|
|||
|
|
#ifndef HEADER_LIB_RENDERER_PRIMITIVES_P5_FASTBUMPEX_HPP
|
|||
|
|
#define HEADER_LIB_RENDERER_PRIMITIVES_P5_FASTBUMPEX_HPP
|
|||
|
|
|
|||
|
|
// Make sure this file is being included from 'FastBump.hpp'.
|
|||
|
|
#ifndef HEADER_LIB_RENDERER_PRIMITIVES_FASTBUMP_HPP
|
|||
|
|
#error The header file 'FastBump.hpp' has not been included!
|
|||
|
|
#endif
|
|||
|
|
|
|||
|
|
|
|||
|
|
//*********************************************************************************************
|
|||
|
|
//
|
|||
|
|
inline uint8 u1GetIntensityFromBumpmap
|
|||
|
|
(
|
|||
|
|
CBumpAnglePair bangp, // The angle pair of a bumpmap's pixel.
|
|||
|
|
uint32 u4_light_theta, // The theta component only of the light source relative
|
|||
|
|
// to the polygon.
|
|||
|
|
uint8* u1a_subtable // Pointer into the angle to intensity lookup table (this
|
|||
|
|
// pointer should be set to represent the light source's
|
|||
|
|
// phi value relative to the polygon.
|
|||
|
|
)
|
|||
|
|
//
|
|||
|
|
// Returns the intensity value given a bumpmap pixel and lighting source values.
|
|||
|
|
//
|
|||
|
|
//**************************************
|
|||
|
|
{
|
|||
|
|
uint8 u1_intensity; // Storage for the intensity return value.
|
|||
|
|
|
|||
|
|
Assert(u1a_subtable);
|
|||
|
|
|
|||
|
|
__asm
|
|||
|
|
{
|
|||
|
|
#if iBUMPMAP_RESOLUTION == 16
|
|||
|
|
movzx eax, word ptr [bangp] // Load the bumpmap pixel.
|
|||
|
|
#else
|
|||
|
|
mov eax, dword ptr [bangp] // Load the bumpmap pixel.
|
|||
|
|
#endif // iBUMPMAP_RESOLUTION == 16
|
|||
|
|
mov ebx, u1a_subtable // Load the pointer to the angle to intensity
|
|||
|
|
// lookup table.
|
|||
|
|
sub eax, u4_light_theta // Find differences in theta.
|
|||
|
|
and eax, iMASK_ANGLETABLE_LOOKUP // Mask out everything but the theta-phi index.
|
|||
|
|
mov al, byte ptr[eax + ebx] // Copy intensity value from the lookup table.
|
|||
|
|
mov u1_intensity, al // Move the intensity value to the return value.
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
// Return the intensity value.
|
|||
|
|
return u1_intensity;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
#endif
|