Every GE command consists of two parts: The command and the argument. They are assembled like this:
(cmd << 24)|(argument)
The command is 8 bits, and the argument 24 bits. The GE accepts 24-bit floats. To convert from a standard float, do this:
u32 ge_float = (* ((u32*) &normal_float)) >> 8;
Many suggested register-names have been contributed by Neovangelist. Thanks!
Items marked with (BASE) means that they use BASE (16/0×10) as the top bits for the address passed in. Write to BASE before the target register.
Light registers are not correct (except for the Light Enable registers), I’ll correct this asap.
| Decimal | Hex | Name | Description |
|---|---|---|---|
| 0 | 00 | NOP | No Operation |
| 1 | 01 | VLIST | Vertex List (BASE) |
| 2 | 02 | ILIST | Index List (BASE) |
| 4 | 04 | PRIM | Primitive Kick Bits 0-15: Number of vertices Bits 16-18: Primitive type |
| 5 | 05 | BEZIER | Bezier Patch Kick Bits 0-7: a1 Bits 8-?: a0 |
| 6 | 06 | SPLINE | Spline Kick Bits 0-7: a1 Bits 8-15: a2 Bits 16-17: a3 Bits 18-23?: t0 |
| 7 | 07 | ??? | - |
| 8 | 08 | JUMP | Jump To New Address (BASE) Bits 0-23: Address |
| 9 | 09 | BJUMP | - (BASE) |
| 10 | 0A | CALL | Call Address (BASE) Bits 0-23: Address |
| 11 | 0B | RET | Return From Call TODO: Figure out stack depth (GS has 2) |
| 12 | 0C | END | - |
| 14 | 1E | SIGNAL | Raise Signal Interrupt Bits 0-15: a1 Bits 16-23: a0 |
| 15 | 1F | FINISH | - |
| 16 | 10 | BASE | Base Address Register Bits 16-20: 4 top bits of address |
| 18 | 12 | VTYPE | Vertex Type Bits 0-1: Texture Format Bits 2-4: Color Format Bits 5-6: Normal Format Bits 7-8: Position Format Bits 9-10: Weight Format Bits 11-12: Index Format Bit 23: Bypass Transform (Raw 2D Coordinates) |
| 21 | 15 | REGION1 | Draw Region Start Bits 0-9: X Start Bits 10-19: Y Start |
| 22 | 16 | REGION2 | Draw Region End Bits 0-9: X End (x + width)-1 Bits 10-19: Y End (y + height)-1 |
| 24 | 18 | LIGHT0 | Light 0 Enable |
| 25 | 19 | LIGHT1 | Light 1 Enable |
| 26 | 1A | LIGHT2 | Light 2 Enable |
| 27 | 1B | LIGHT3 | Light 3 Enable |
| 28 | 1C | ??? | State Related |
| 29 | 1D | ??? | State Related |
| 30 | 1E | ??? | State Related |
| 31 | 1F | ??? | State Related |
| 32 | 20 | DTE | State Related |
| 33 | 21 | ABE | Alpha Blend Enable |
| 34 | 22 | ATE | Alpha Test Enable |
| 35 | 23 | ZTE | Depth Test Enable |
| 36 | 24 | ??? | State Related |
| 37 | 25 | ??? | State Related |
| 38 | 26 | ??? | State Related |
| 39 | 27 | ??? | State Related |
| 40 | 28 | ??? | State Related |
| 42 | 2A | ??? | Bone Matrix Offset Bits 0-23: Bone Matrix offset (value = index * (3*4)) |
| 43 | 2B | ??? | Bone Matrix Value Bits 0-23: Bone Matrix Value (float) Written 3*4 times to upload one matrix (3*4 matrix) |
| 44 | 2C | ??? | Morph Weight 0 Bits 0-23: Morph Weight (float) |
| 45 | 2D | ??? | Morph Weight 1 Bits: See Previous |
| 46 | 2E | ??? | Morph Weight 2 Bits: See Previous |
| 47 | 2F | ??? | Morph Weight 3 Bits: See Previous |
| 48 | 30 | ??? | Morph Weight 4 Bits: See Previous |
| 49 | 31 | ??? | Morph Weight 5 Bits: See Previous |
| 50 | 32 | ??? | Morph Weight 6 Bits: See Previous |
| 51 | 33 | ??? | Morph Weight 7 Bits: See Previous |
| 54 | 36 | ??? | Patch Divide Bits 0-7: a0 Bits 8-15: a1 |
| 55 | 37 | ??? | Patch Prim Bits 0-1: a0 == 0 : 2; a0 == 2: 1; a0 == 4: 0 |
| 56 | 38 | ??? | Patch Front Face Bits 0-23: Value |
| 58 | 3A | ??? | World Matrix Upload Bits: 0-23: Float (strobe???) (write 0.0f before uploading) |
| 59 | 3B | ??? | World Matrix Upload Bits: 0-23: Float (write 3*4 values to upload complete matrix) (3*4 matrix) |
| 60 | 3C | ??? | View Matrix strobe Bits: 0-23: Float (strobe???) (write 0.0f before uploading) |
| 61 | 3D | ??? | View Matrix upload Bits: 0-23: Float (write 3*4 values to upload complete matrix) (3*4 matrix) |
| 62 | 3E | ??? | Projection matrix strobe Bits 0-23: Float (strobe???) (write 0.0f before uploading) |
| 63 | 3F | ??? | Projection Matrix upload Bits 0-23: Float (write 4*4 values to upload complete matrix) |
| 64 | 40 | ??? | Texture Matrix Strobe??? Bits 0-23: Float (strobe???) (write 0.0f before uploading) |
| 65 | 41 | ??? | Texture Matrix Upload??? Bits 0-23: Float (write 3*4 values to upload complete matrix) (3*4 matrix) |
| 66 | 42 | XSCALE | Viewport X Scale Bits 0-23: X Scale (float) (480) |
| 67 | 43 | YSCALE | Viewport Bits 0-23: Y Scale (float) (-272) |
| 68 | 44 | ??? | Depth Range??? Bits 0-23: Float |
| 69 | 45 | XOFFSET | Viewport X Offset Bits 0-23: Offset (float) (2048) |
| 70 | 46 | YOFFSET | Viewport Y Offset Bits 0-23: Offset (float) (2048) |
| 71 | 47 | ??? | Depth Offset??? Bits 0-23: Float |
| 72 | 48 | ??? | Texture Scale U Bits 0-23: U Scale (float) |
| 73 | 49 | ??? | Texture Scale V Bits 0-23: V Scale (float) |
| 74 | 4A | ??? | Texture Offset U Bits 0-23: U Offset (float) |
| 75 | 4B | ??? | Texture Offset V Bits 0-23: V Offset (float) |
| 76 | 4C | OFFSETX | Viewport offset (X) Bits 0-23: X-Offset « 4 |
| 77 | 4D | OFFSETY | Viewport offset (Y) Bits 0-23: Y-Offset « 4 |
| 80 | 50 | SHADE | Shading Bit 0: 0/1 Flat/Gouraud(???) |
| 81 | 51 | ??? | State Related |
| 83 | 53 | ??? | Color Material Bits 0-23: Color Material (RGB?) |
| 84 | 54 | ??? | Related to Model Color Bits 0-23: a0 (sceGuModelColor()) |
| 85 | 55 | ??? | Ambient Model Color Bits 0-23: Color |
| 86 | 56 | ??? | Related to Model Color Bits 0-23: a2 (sceGuModelColor()) |
| 87 | 57 | ??? | Related to Model Color Bits 0-23: a3 (sceGuModelColor()) |
| 88 | 58 | ??? | Ambient Color Alpha Bits 0-7: Ambient Color Alpha |
| 91 | 5B | ??? | Specular Power Bits 0-23: Specular power (float) |
| 92 | 5C | ??? | Ambient RGB (BGR?) Bits: 0-23: Color |
| 93 | 5D | ??? | Ambient Alpha Bits 0-7: Alpha |
| 94 | 5E | ??? | Light Mode Bits: 0-23: ??? |
| 95 | 5F | ??? | Light X Position (Light 0) Bits 0-23: Position (float) |
| 96 | 60 | ??? | Light X Position (Light 1) Bits: See Previous |
| 97 | 61 | ??? | Light X Position (Light 2) Bits: See Previous |
| 98 | 62 | ??? | Light X Position (Light 3) Bits: See Previous |
| 101 | 65 | ??? | Light Z Direction (Light 0) Bits 0-23: Direction (float) |
| 104 | 68 | ??? | Light Z Direction (Light 1) Bits 0-23: Direction (float) |
| 107 | 6B | ??? | Light Z Direction (Light 2) Bits 0-23: Direction (float) |
| 110 | 6E | ??? | Light Z Direction (Light 3) Bits 0-23: Direction (float) |
| 111 | 6F | ??? | Light Y Direction (Light 0) Bits 0-23: Direction (float) |
| 112 | 70 | ??? | Light X Direction (Light 0) Bits 0-23: Direction (float) |
| 113 | 71 | ??? | Light Z Position (Light 0) Bits 0-23: Position (float) |
| 114 | 72 | ??? | Light Y Direction (Light 1) Bits 0-23: Direction (float) |
| 115 | 73 | ??? | Light X Direction (Light 1) Bits 0-23: Direction (float) |
| 116 | 74 | ??? | Light Z Position (Light 1) Bits 0-23: Position (float) |
| 117 | 75 | ??? | Light Y Direction (Light 2) Bits 0-23: Direction (float) |
| 118 | 76 | ??? | Light X Direction (Light 2) Bits 0-23: Direction (float) |
| 119 | 77 | ??? | Light Z Position (Light 2) Bits 0-23: Position (float) |
| 120 | 78 | ??? | Light Y Direction (Light 3) Bits 0-23: Direction (float) |
| 121 | 79 | ??? | Light X Direction (Light 3) Bits 0-23: Direction (float) |
| 122 | 7A | ??? | Light Z Position (Light 3) Bits 0-23: Position (float) |
| 123 | 7B | ??? | Light Color Related (Light 0) (8) Bits 0-23: Color |
| 124 | 7C | ??? | Inner/Outer Cone For Light??? (Light 0) Bits 0-23: Float |
| 125 | 7D | ??? | Inner/Outer Cone For Light??? (Light 0) Bits 0-23: Float |
| 126 | 7E | ??? | Light Color Related (Light 1) (8) Bits 0-23: Color |
| 127 | 7F | ??? | Inner/Outer Cone For Light??? (Light 1) Bits 0-23: Float |
| 128 | 80 | ??? | Inner/Outer Cone For Light??? (Light 1) Bits 0-23: Float |
| 129 | 81 | ??? | Light Color Related (Light 2) (8) Bits 0-23: Color |
| 130 | 82 | ??? | Inner/Outer Cone For Light??? (Light 2) Bits 0-23: Float |
| 131 | 83 | ??? | Inner/Outer Cone For Light??? (Light 2) Bits 0-23: Float |
| 132 | 84 | ??? | Light Color Related (Light 3) (8) Bits 0-23: Color |
| 133 | 85 | ??? | Inner/Outer Cone For Light??? (Light 3) Bits 0-23: Float |
| 134 | 86 | ??? | Inner/Outer Cone For Light??? (Light 3) Bits 0-23: Float |
| 144 | 90 | ??? | Light Color Related (Light 0) (10) Bits 0-23: Color |
| 145 | 91 | ??? | Light Color Related (Light 0) (9) Bits 0-23: Color |
| 147 | 93 | ??? | Light Color Related (Light 1) (10) Bits 0-23: Color |
| 148 | 94 | ??? | Light Color Related (Light 1) (9) Bits 0-23: Color |
| 150 | 96 | ??? | Light Color Related (Light 2) (10) Bits 0-23: Color |
| 151 | 97 | ??? | Light Color Related (Light 2) (9) Bits 0-23: Color |
| 153 | 99 | ??? | Light Color Related (Light 3) (10) Bits 0-23: Color |
| 154 | 9A | ??? | Light Color Related (Light 3) (9) Bits 0-23: Color |
| 155 | 9B | ??? | Front Face Bit 0: 0/1 (Front face???) |
| 156 | 9C | FBP | Frame Buffer Bits 0-23: Address |
| 157 | 9D | FBW | Frame Buffer Width Bits 16-23: 8 Top Bits FBP Bits 0-15: Frame Buffer Width |
| 158 | 9E | ZBP | Depth Buffer Bits 0-23: Address |
| 159 | 9F | ZBW | Depth Buffer Width Bits 16-23: 8 Top Bits ZBP Bits 0-15: Depth Buffer Width |
| 160 | A0 | TBP0 | Texture Base Pointer (Mipmap level 0) Bits 0-23: Texture Pointer |
| 161 | A1 | TBP1 | Texture Base Pointer (Mipmap level 1) Bits: See Previous |
| 162 | A2 | TBP2 | Texture Base Pointer (Mipmap level 2) Bits: See Previous |
| 163 | A3 | TBP3 | Texture Base Pointer (Mipmap level 3) Bits: See Previous |
| 164 | A4 | TBP4 | Texture Base Pointer (Mipmap level 4) Bits: See Previous |
| 165 | A5 | TBP5 | Texture Base Pointer (Mipmap level 5) Bits: See Previous |
| 166 | A6 | TBP6 | Texture Base Pointer (Mipmap level 6) Bits: See Previous |
| 167 | A7 | TBP7 | Texture Base Pointer (Mipmap level 7) Bits: See Previous |
| 168 | A8 | TBW0 | Texture Buffer Width (Mipmap level 0) Bits 16-20: 4 Top Bits TBP Bits 0-15: Texture Buffer Width |
| 169 | A9 | TBW1 | Texture Buffer Width (Mipmap level 1) Bits: See Previous |
| 170 | AA | TBW2 | Texture Buffer Width (Mipmap level 2) Bits: See Previous |
| 171 | AB | TBW3 | Texture Buffer Width (Mipmap level 3) Bits: See Previous |
| 172 | AC | TBW4 | Texture Buffer Width (Mipmap level 4) Bits: See Previous |
| 173 | AD | TBW5 | Texture Buffer Width (Mipmap level 5) Bits: See Previous |
| 174 | AE | TBW6 | Texture Buffer Width (Mipmap level 6) Bits: See Previous |
| 175 | AF | TBW7 | Texture Buffer Width (Mipmap level 7) Bits: See Previous |
| 176 | B0 | CBP | CLUT Pointer Bits 0-23: Address |
| 177 | B1 | CBP2 | CLUT Pointer (Top Bits) Bits 16-20: 4 Bits Top CBP |
| 178 | B2 | SBP | Source Buffer (Texture Transfer) Bits 0-23: Address |
| 179 | B3 | SBW | Source Buffer Width Bits 16-23: 8 Top Bits SBP Bits 0-15: Source Buffer Width |
| 180 | B4 | DBP | Destination Buffer (Texture Transfer) Bits 0-23: Address |
| 181 | B5 | DBW | Destination Buffer Width Bits 16-23: 8 Top Bits DBP Bits 0-15: Destination Buffer Width |
| 184 | B8 | TSIZE0 | Texture Size (Mipmap level 0) Bits 0-7: Log2(Width) Bits 8-15: Log2(Height) |
| 185 | B9 | TSIZE1 | Texture Size (Mipmap level 1) Bits: See Previous |
| 186 | BA | TSIZE2 | Texture Size (Mipmap level 2) Bits: See Previous |
| 187 | BB | TSIZE3 | Texture Size (Mipmap level 3) Bits: See Previous |
| 188 | BC | TSIZE4 | Texture Size (Mipmap level 4) Bits: See Previous |
| 189 | BD | TSIZE5 | Texture Size (Mipmap level 5) Bits: See Previous |
| 190 | BE | TSIZE6 | Texture Size (Mipmap level 6) Bits: See Previous |
| 191 | BF | TSIZE7 | Texture Size (Mipmap level 7) Bits: See Previous |
| 192 | C0 | TMAP | Texture Projection Map Mode + Texture Map Mode Bits 0-1: Texture Map Mode Bits 8-11: Texture Projection Map Mode |
| 193 | C1 | TSHADE | Texture Map Mode (continued) Bits 0-1: a1 Bits 8-15(23?): a2 |
| 194 | C2 | TMODE | Texture Mode Bits 0-8: a3 Bits 8-15: a2 Bits 16-23: a1 |
| 195 | C3 | TPSM | Texture Format Bits 0-23: Format |
| 196 | C4 | ??? | Related to CLUT (Number of colors???) Bits 0-23: ??? |
| 197 | C5 | CMODE | Clut Mode Bits 0-1: a0 Bits 2-7(?): a1 Bits 8-15: a2 Bits 16-23: a3 |
| 198 | C6 | TFLT | Texture Filter Bits 0-7: a0 (min/mag?) Bits 8-15: a1 (min/mag?) |
| 199 | C7 | TWRAP | Texture Wrap Bits 0-7: U Wrap Bits 8-15: V Wrap |
| 200 | C8 | ??? | Texture Level Mode (L/K???) Bits 0-15: a0 Bits 16-23: -128 - 128 (Mip map bias?) |
| 201 | C9 | ??? | Texture Function Bits 0-7: a0 Bits 8-15: a1 Bits 16-23: ??? |
| 202 | CA | ??? | Texture Env Color Bits 0-23: Color (RGB) |
| 203 | CB | TFLUSH | Texture Flush Bits 0-23: Strobe? (float) (Just write zero) |
| 204 | CC | TSYNC | Texture Sync Bits 0-23: Strobe? (Just write zero) |
| 205 | CD | ??? | Fog End (?) Bits 0-23: Distance (float) |
| 206 | CE | ??? | Fog Range Bits 0-23: Inverse relative distance (float) 1.0/(far-near) |
| 207 | CF | ??? | Fog Color Bits 0-23: Color (RGB) |
| 208 | D0 | ??? | Texture Slope Bits 0-23: Texture Slope (float) |
| 210 | D2 | PSM | Pixel Format Bits 0-1: Pixel Format |
| 211 | D3 | CLEAR | Clear Flags Bit 0: Clear enabled??? Bit 8-11: Clear Flags |
| 212 | D4 | ??? | Scissor X/Y Start Bits 0-9: X Start Bits 10-19: Y Start |
| 213 | D5 | ??? | Scissor X/Y End Bits 0-9: X End ((Width + X Start)-1) Bits 10-19: Y End ((Height + Y Start)-1) |
| 214 | D6 | ??? | Near Plane Bits 0-23: Near Depth (int) |
| 215 | D7 | ??? | Far Plane Bits 0-23: Far Depth (int) |
| 216 | D8 | ??? | Color Function Bits 0-1: Function |
| 217 | D9 | ??? | Color for Color Function Bits 0-23: RGB |
| 218 | DA | ??? | Color for Color function (???) Bits 0-23: RGB |
| 219 | DB | ATST | Alpha Func Bits 0-7: a0 Bits 8-15: a1 Bits 16-23: a2 |
| 220 | DC | ??? | Stencil Function Bits 0-7: a0 Bits 8-15: a1 Bits 16-23: a2 |
| 221 | DD | ??? | Stencil Op Bits 0-7: a0 Bits 8-15: a1 Bits 16-23: a2 |
| 222 | DE | ZTST | Depth Function Bits 0-23(?): Depth test function? |
| 223 | DF | ALPHA | Blend function Bits 0-3: a1 Bits 4-7: a2 Bits 8-11: a3 |
| 224 | E0 | ??? | Related to blend function Bits 0-23: Value (fix? seems to be a color) |
| 225 | E1 | ??? | Related to blend function Bits 0-23: Value (fix? seems to be a color) |
| 226 | E2 | ??? | Dither Matrix, Row 0 Bits 0-3: Column 0 Bits 4-7: Column 1 Bits 8-11: Column 2 Bits 12-15: Column 3 |
| 227 | E3 | ??? | Dither Matrix, Row 1 Bits: See Previous |
| 228 | E4 | ??? | Dither Matrix, Row 2 Bits: See Previous |
| 229 | E5 | ??? | Dither Matrix, Row 3 Bits: See Previous |
| 230 | E6 | ??? | Logical Op Bits 0-3: Logical Op |
| 231 | E7 | DMASK | Depth Mask Bits 0-23: Depth Mask |
| 232 | E8 | PMASK | Pixel Mask (RGB) Bits 0-23: Pixel Mask (RGB) |
| 233 | E9 | PMASKA | Pixel Mask (Alpha) Bits 0-7: Pixel Mask (Alpha) |
| 234 | EA | ??? | Texel Size For Texture Transfer Bit 0: 0/1 (16/32 bits per texel) |
| 235 | EB | SBPOS | X/Y Offset for Source Buffer Bits 0-9: X Offset Bits 10-19: Y Offset |
| 236 | EC | DBPOS | X/Y Offset for Destination Buffer Bits 0-9: X Offset Bits 10-19: Y Offset |
| 238 | EE | ??? | Width / Height For Texture Transfer Bits 0-9: Width? (Width-1) Bits 10-19: Height? (Height-1) |