extern C extern csScanSetup Scan

The only instance of this structure

The following fields are only used when drawing unlighted tiled textures (the draw_scanline_

The following fields are used by the polygon drawer and contain information fot calculating the 1/z, u/z, and v/z linear equations

int AlphaFact

General alpha factor for 16-bit renderer (0 to 255).

RGB8map* AlphaMap

Set up by poly renderer to alpha blending table

unsigned int AlphaMask

Alpha mask for 16-bit renderer.

int and_h

1 << shf_h - 1

int and_w

1 << shf_w - 1

unsigned char* BlendingTable[6]

This table contains eight subtables - one for each available blending mode (see BLENDTABLE_XXX constants)

unsigned char* BlendTable

Current blending table

unsigned short* color_565_table

This table is really two tables in one (they have the same size -- notice the 2 as a multiplier)

float dJ1

Difference for every 16 pixels.

float dK1

Difference for every 16 pixels.

float dM

Difference for every 16 pixels.

unsigned char* exp_16

Same in the range 0

unsigned char* exp_256

A table of exp(x) in the range 0

float fdu

Difference with u for untiled textures.

float fdv

Difference with v for untiled textures.

int* filter_mul_table

These tables are used for bilinear filtering

int FlatColor

Mean color value.

unsigned char* Fog8

The fog table for paletted (currently only 8-bit) modes

unsigned long FogDensity

Fog density

int FogPix

The fog pixel (R|G|B for true/hicolor) or index into palette of fog color

int FogR

Fog color

int InterpolMode

Interpolation mode

int InterpolShift

Interpolation step (shift-value) for semi-perspective correct texture mapping

int InterpolStep

Interpolation step for semi-perspective correct texture mapping

float J1

Difference value for every horizontal dx.

float K1

Difference value for every horizontal dx.

float M

Difference value for every horizontal dx.

unsigned int* one_div_z

A table of 4096 1/z values where z is in fixed-point 0

unsigned short* PaletteTable

8-bit to 16-bit conversion table

unsigned char* PrivToGlobal

Local texture palette -> global palette conversion table

int shf_h

log2(texture_height)

int shf_u

log2 (texture_u)

int shf_w

log2(texture_width)

csTextureMMSoftware* Texture

A pointer to the texture.

int th

Height of unlighted texture.

int th2

Height of the texture from the texture cache.

int th2fp

Texture height in 16:16 fixed-point format - 1

unsigned char* tmap

The unlighted texture bitmap.

unsigned char* tmap2

The lighted texture bitmap from the texture cache.

int tw

Width of unlighted texture.

int tw2

Width of the texture from the texture cache.

int tw2fp

Texture width in 16:16 fixed-point format - 1

int InterpolStep

Interpolation step for semi-perspective correct texture mapping

int InterpolShift

Interpolation step (shift-value) for semi-perspective correct texture mapping

int InterpolMode

Interpolation mode

int FogR

Fog color

int FogPix

The fog pixel (R|G|B for true/hicolor) or index into palette of fog color

unsigned long FogDensity

Fog density

unsigned char* Fog8

The fog table for paletted (currently only 8-bit) modes

csTextureMMSoftware* Texture

A pointer to the texture.

unsigned char* tmap2

The lighted texture bitmap from the texture cache.

int tw2

Width of the texture from the texture cache.

int th2

Height of the texture from the texture cache.

float fdu

Difference with u for untiled textures.

float fdv

Difference with v for untiled textures.

int tw2fp

Texture width in 16:16 fixed-point format - 1

int th2fp

Texture height in 16:16 fixed-point format - 1

unsigned char* tmap

The unlighted texture bitmap.

int tw

Width of unlighted texture.

int th

Height of unlighted texture.

The following fields are used by the polygon drawer and contain information fot calculating the 1/z, u/z, and v/z linear equations

float M

Difference value for every horizontal dx.

float J1

Difference value for every horizontal dx.

float K1

Difference value for every horizontal dx.

float dM

Difference for every 16 pixels.

float dJ1

Difference for every 16 pixels.

float dK1

Difference for every 16 pixels.

int FlatColor

Mean color value.

unsigned int AlphaMask

Alpha mask for 16-bit renderer.

int AlphaFact

General alpha factor for 16-bit renderer (0 to 255).

int shf_u

log2 (texture_u)

The following fields are only used when drawing unlighted tiled textures (the draw_scanline_..._map_... routines don't need them).

int shf_w

log2(texture_width)

int and_w

1 << shf_w - 1

int shf_h

log2(texture_height)

int and_h

1 << shf_h - 1

unsigned char* PrivToGlobal

Local texture palette -> global palette conversion table

unsigned short* PaletteTable

8-bit to 16-bit conversion table

RGB8map* AlphaMap

Set up by poly renderer to alpha blending table

unsigned char* BlendTable

Current blending table

int* filter_mul_table

These tables are used for bilinear filtering. This feature is still (and IMHO, till Merced III-10GHz, will remain) experimental. - D.D. To all familiar with MMX: implementation in MMX can be fast -- routine makes the same things for four pixels values. And quality could jump (for speed and memory consumption I'm using 16 grades).

This table incorporates values (1-x)*(1-y), (1-x)*y, x*(1-y), and x*y

unsigned short* color_565_table

This table is really two tables in one (they have the same size -- notice the 2 as a multiplier). It removes all the multiplications from the function. Sorry for lack of details, but there's a lot to be said. If you really want to know what is this table for, see "scan.cpp" and "scan16.cpp" -- generation of the table, and it's usage respectively.

unsigned int* one_div_z

A table of 4096 1/z values where z is in fixed-point 0.12 format Used in fog routines to get the real value of Z. The result is an 8.24 fixed-point number.

unsigned char* exp_256

A table of exp(x) in the range 0..255; x == 0..EXP_256_SIZE

unsigned char* exp_16

Same in the range 0..31 for 8-bit fog

unsigned char* BlendingTable[6]

This table contains eight subtables - one for each available blending mode (see BLENDTABLE_XXX constants). Since SRC can be twice brighter than maximum, BlendingTable has a twice larger SRC dimension (i.e. it is a (BLENDTABLE_MAX*2 x BLENDTABLE_MAX) matrix);

alphabetic index hierarchy of classes

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