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89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
/***********************************************************************************************
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*
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* Copyright © DreamWorks Interactive. 1996
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*
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* Contents:
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* Assembly functions for fast bumpmapping.
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* Optimized for the AMD K6-3D Processor
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*
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* Notes:
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*
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* To Do:
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*
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***********************************************************************************************
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*
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* $Log:: /JP2_PC/source/Lib/Renderer/Primitives/AMDK6/FastBumpEx.hpp $
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*
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* 3 1/19/98 7:30p Pkeet
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* Added support for 16 bit bumpmaps by adding lower colour resolution and a smaller size for
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* 'CBumpAnglePair.'
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*
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* 2 97.10.27 1:25p Mmouni
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* Initial K6-3D version, copied from the Pentium versions.
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*
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* 4 9/01/97 8:03p Rwyatt
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*
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* 3 9/24/96 2:56p Pkeet
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* Removed the overloaded '+' operator assembly function.
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*
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* 2 9/11/96 11:35a Pkeet
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* Added explicit references (dword ptr's) to assembly operations involving the angle pair
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* format.
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*
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* 1 9/06/96 2:50p Pkeet
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* Initial implementation.
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*
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**********************************************************************************************/
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#ifndef HEADER_LIB_RENDERER_PRIMITIVES_P5_FASTBUMPEX_HPP
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#define HEADER_LIB_RENDERER_PRIMITIVES_P5_FASTBUMPEX_HPP
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// Make sure this file is being included from 'FastBump.hpp'.
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#ifndef HEADER_LIB_RENDERER_PRIMITIVES_FASTBUMP_HPP
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#error The header file 'FastBump.hpp' has not been included!
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#endif
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//*********************************************************************************************
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//
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inline uint8 u1GetIntensityFromBumpmap
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(
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CBumpAnglePair bangp, // The angle pair of a bumpmap's pixel.
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uint32 u4_light_theta, // The theta component only of the light source relative
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// to the polygon.
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uint8* u1a_subtable // Pointer into the angle to intensity lookup table (this
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// pointer should be set to represent the light source's
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// phi value relative to the polygon.
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)
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//
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// Returns the intensity value given a bumpmap pixel and lighting source values.
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//
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//**************************************
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{
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uint8 u1_intensity; // Storage for the intensity return value.
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Assert(u1a_subtable);
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__asm
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{
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#if iBUMPMAP_RESOLUTION == 16
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movzx eax, word ptr [bangp] // Load the bumpmap pixel.
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#else
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mov eax, dword ptr [bangp] // Load the bumpmap pixel.
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#endif // iBUMPMAP_RESOLUTION == 16
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mov ebx, u1a_subtable // Load the pointer to the angle to intensity
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// lookup table.
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sub eax, u4_light_theta // Find differences in theta.
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and eax, iMASK_ANGLETABLE_LOOKUP // Mask out everything but the theta-phi index.
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mov al, byte ptr[eax + ebx] // Copy intensity value from the lookup table.
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mov u1_intensity, al // Move the intensity value to the return value.
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};
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// Return the intensity value.
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return u1_intensity;
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}
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#endif
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