ビデオ - ラスタライズエンジン

3D コアレジスタ

名前	幅	アドレス
GFX_CONTROL	16	0x04000060
GFX_FIFO	32	0x04000400
GFX_STATUS	32	0x04000600
GFX_TEX_FORMAT	32	0x040004A8
GFX_CLEAR_COLOR	32	0x04000350
GFX_CLEAR_DEPTH	16	0x04000354
GFX_LIGHT_VECTOR	32	0x040004C8
GFX_LIGHT_COLOR	32	0x040004CC
GFX_DIFFUSE_AMBIENT	32	0x040004C0
GFX_SPECULAR_EMISSION	32	0x040004C4
GFX_SHININESS	32	0x040004D0
GFX_POLY_FORMAT	32	0x040004A4
GFX_ALPHA_TEST	16	0x04000340
GFX_FLUSH	32	0x04000540
GFX_VIEWPORT	32	0x04000580
GFX_TOON_TABLE	16	0x04000380
GFX_EDGE_TABLE	16	0x04000330
GFX_VERTEX_RAM_USAGE	16	0x04000606
GFX_POLYGON_RAM_USAGE	16	0x04000604

GFX_TEX_FORMAT

31..30	Texgen mode
29	?
28..26	Texture Format
25..23	Texture Height
22..20	Texture Width
19	Flip T
18	Flip S
17	Wrap T
16	Wrap S
15..0	Texture address / 8

Texgen mode affects what texture coordinates are passed into the rasterizer.

• 00 Tex-coord passed through
• 01 Tex-coord * texture matrix
• 10 Normal * texture matrix
• 11 Vertex * texture matrix

Texture formats:
0 ?
1 RGB32_A3 - 32 color palette, 3 bits of alpha
2 RGB4 - 4 color palette (2 bpp)
3 RGB16 - 16 color palette (4 bpp)
4 RGB256 - 256 color palette (8 bpp)
5 Compressed
6 RGB8_A5 - 8 color palette, 5 bits of alpha
7 RGBA - 15 bpp RGB plus 1 bit alpha in MSB (16 bpp)

Texture sizes are powers of 2 from 8 to 1024 (0..7). A texture does not have to be square.

libnds function calls associated with this register:

• glBindTexture
• glTexImage2d

GFX_POLY_FORMAT

31..30 ?
29..24 Polygon ID
23..21 ?
20..16 Polygon alpha (31: opaque)
15..8 ?
7..6 Cull mode (00: front and back, 01: front, 10: back, 11: none)
5..4 Mode (00: Modulate, 01: Decal, 10: Toon shading, 11: Shadow)
3 Light 3 enable
2 Light 2 enable
1 Light 1 enable
0 Light 0 enable

libnds function calls associated with this register:

   * glPolyFmt 

GFX_LIGHT_VECTOR

31..30 Light ID #
29..20 z component of normal (.10 fixed)
19..10 y component of normal (.10 fixed)
9..0 x component of normal (.10 fixed)

libnds function calls associated with this register:

   * glLight 

GFX_LIGHT_COLOR

31..30 Light ID #
14..10 RGB color

libnds function calls associated with this register:

   * glLight 

GFX_DIFFUSE_AMBIENT

31..16 Ambient color
15..0 Diffuse color
GFX_SPECULAR_EMISSION
31..16 Emission color
15..0 Specular color

libnds function calls associated with this register:

   * glMaterialf 

GFX_CONTROL

15..14 ?
13 Polygon / vertex memory overflow (write 1 to reset)
12 Line buffer overflow (write 1 to reset)
11..6 ?
5 Outlining (1: enabled)
4 Antialiasing (1: enabled)
3 Alpha blending (1: enabled)
2 Alpha test (1: enabled)
1 Shading mode (0: toon, 1: highlighting)
0 Texture-mapping (1: enabled)
GFX_ALPHA_TEST
15..5 -
4..0 Alpha threshold

If enabled (see GFX_CONTROL or glEnable), fragments are discarded if their post-blend alpha value is below the threshold set in this register.

libnds function calls associated with this register:

   * glAlphaFunc 

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