mirror of
https://github.com/ptitSeb/Serious-Engine
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85 lines
3.4 KiB
C
85 lines
3.4 KiB
C
/*
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* LWSDK Header File
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* Copyright 1999, NewTek, Inc.
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*
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* LWTEXTURE.H -- LightWave Procedural Textures
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*
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* This header defines the procedural texture render handler. These
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* are the building blocks of texture channel layers.
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*/
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#ifndef LWSDK_TEXTURE_H
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#define LWSDK_TEXTURE_H
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#include <lwrender.h>
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#define LWTEXTURE_HCLASS "TextureHandler"
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#define LWTEXTURE_ICLASS "TextureInterface"
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#define LWTEXTURE_VERSION 5
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/*
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wPos: coordinates in world space, these are the raw coordinates unaffected by any transformation.
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tPos: coordinates in texture space. This is the coordinates that will most likeley be used
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by the server, the result from the transformation set by the user (scale, position, etc.)
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size: scale of the texture in the 3 directions. This is sometimes usefull for antialiasing.
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amp: amplitude of the texture. This information can also be used for antialiasing.
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spotSize: for antialiasing.
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txGrad: this is a return vector in case the server knows how to compute the gradient itself. This
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value will only be used if the server returns the LWTEXF_GRAD flag.
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axis: which dimensions are being evaluated. Usually it will be AXIS_X | AXIS_Y | AXIS_Z, though it
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might change in some situations if the texture is evaluated for example in a 2D or 1D context.
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octaves: this is the number of octaves in the fractal texture required by HV. This is how HV
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maintains a constant level of detail based on the distance from the viewer. This should be discarded
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for non fractal textures.
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txRGBA: this is the return color and alpha value in case the texture outputs its own color.
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Note: when returning a gradient or a color, the texture should also return the texture value at that
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point. This value can be thought of as the altitude of the texture at that point.
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*/
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typedef struct st_LWTextureAccess {
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double wPos[3],tPos[3],size[3],amp; // input
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double spotSize; // input
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double txGrad[3]; // output
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int axis,flags; // input
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double octaves; // input
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double txRGBA[4]; // output
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} LWTextureAccess;
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typedef struct st_LWTextureHandler {
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LWInstanceFuncs *inst;
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LWItemFuncs *item;
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LWRenderFuncs *rend;
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double (*evaluate) (LWInstance, LWTextureAccess *);
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unsigned int (*flags) (LWInstance);
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} LWTextureHandler;
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/*
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These are the server flags
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*/
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#define LWTEXF_GRAD (1<<0) /* texture returns its own gradient */
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#define LWTEXF_SLOWPREVIEW (1<<1) /* texture editor preview will be delayed */
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#define LWTEXF_AXIS (1<<2) /* texture needs an axis control */
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#define LWTEXF_AALIAS (1<<3) /* texture is naturally antialiased */
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#define LWTEXF_DISPLACE (1<<4) /* texture is available for displacement */
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#define LWTEXF_HV_SRF (1<<5) /* texture is available for HV surfaces */
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#define LWTEXF_HV_VOL (1<<6) /* texture is available for HV volumes */
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#define LWTEXF_SELF_COLOR (1<<7) /* texture returns its own color */
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/*
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These are the evaluation flags passed in the TextureAccess
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*/
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#define LWTXEF_VECTOR (1<<0) /* vector (=bump) evaluation context */
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#define LWTXEF_AXISX (1<<1)
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#define LWTXEF_AXISY (1<<2)
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#define LWTXEF_AXISZ (1<<3)
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#define LWTXEF_DISPLACE (1<<4) /* displacement evaluation context */
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#define LWTXEF_COLOR (1<<5) /* color evaluation context */
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#endif
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