Get vector*matrix from GTE
(Redirected from Get vector from GTE)
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Parameters : r4 = pointer
0x00 - word Vector 0 X and Y (2 halfwords ?)
0x04 - word Vector 0 Z
r5 = pointer for return values
r6 = pointer for return value
Returns : Some vectors maths at r5 0x00, 0x04 and 0x08
Value at gtecr31 at r6 0x00
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8001d578: c8800000 lwc2 gtedr00_vxy0,0x0000(r4) Load word at r4 0x0000 to coprocessor 2 - vxy0 (vector 0 X and Y)
8001d57c: c8810004 lwc2 gtedr01_vz0,0x0004(r4) Load word at r4 0x0004 to coprocessor 2 - vz0 (vector 0 Z)
8001d580: 00000000 nop
8001d584: 4a480012 mvmva 0x1,0x0,0x0,0x0,0x0 Multiply vector by matrix and vector addition (See notes)
8001d588: e8b90000 swc2 gtedr25_mac1,0x0000(r5) Store word from mac1 to r5 0x000 may be X coordinates*28 (see notes)
8001d58c: e8ba0004 swc2 gtedr26_mac2,0x0004(r5) Store word from mac2 to r5 0x004 Height related
8001d590: e8bb0008 swc2 gtedr27_mac3,0x0008(r5) Store word from mac3 to r5 0x008 may be Y coordinates*28
8001d594: 4842f800 cfc2 r2,gtecr31_flag r2 = gtecr31 (number of leading 0 (1 if negative) from last word moved to gtedr30_lzcs (see Get_Square_root_of_r4_dealing_with_4096)
8001d598: 03e00008 jr r31
8001d59c: acc20000 sw r2,0x0000(r6) store gtecr30_lzcs leading zeros (or one) to r6 0x00
Notes
MVMVA 8 cop2 0x0400012 Multiply vector by matrix and vector addition.
Fields: sf, mx, v, cv, lm
in: V0/V1/V2/IR Vector v0, v1, v2 or [IR1,IR2,IR3]
R/LLM/LCM Rotation, light or color matrix. [1,3,12]
TR/BK Translation or background color vector.
out: [IR1,IR2,IR3] Short vector
[MAC1,MAC2,MAC3] Long vector
Calculation:
MX = matrix specified by mx
V = vector specified by v
CV = vector specified by cv
MAC1=A1[CV1 + MX11*V1 + MX12*V2 + MX13*V3] div by 28 and used as X coord (in 0x001af8b4)
MAC2=A2[CV2 + MX21*V1 + MX22*V2 + MX23*V3]
MAC3=A3[CV3 + MX31*V1 + MX32*V2 + MX33*V3] div by 28 and used as Y coord (in 0x001af8b4)
IR1=Lm_B1[MAC1]
IR2=Lm_B2[MAC2]
IR3=Lm_B3[MAC3]
Notes:
The cv field allows selection of the far color vector, but this vector
is not added correctly by the GTE.
Return locations
Battle.bin 0007d67c: 0007d5d0_-_0007db18 0007d69c: 0007d5d0_-_0007db18 0007d6bc: 0007d5d0_-_0007db18 0007d6dc: 0007d5d0_-_0007db18 0007dad0: 0007d5d0_-_0007db18 0007dc20: 0007db1c_-_0007e300 0007dc40: 0007db1c_-_0007e300 0007dc60: 0007db1c_-_0007e300 0007dc80: 0007db1c_-_0007e300 0007de8c: 0007db1c_-_0007e300 0007deac: 0007db1c_-_0007e300 0007ded4: 0007db1c_-_0007e300 0007defc: 0007db1c_-_0007e300 0007e044: 0007db1c_-_0007e300 0007e06c: 0007db1c_-_0007e300 0007e08c: 0007db1c_-_0007e300 0007e0ac: 0007db1c_-_0007e300 0007e50c: 0007e304_-_0007e728 0007e6e0: 0007e304_-_0007e728 0007e86c: 0007e72c_-_0007e9a4 0007f0ec: Display_Status_Bubble 0007f164: Display_Status_Bubble 0007f32c: 0007f2ac_-_0007f3fc 00086ba8: 00086b44_-_00086dc0 00086d7c: 00086b44_-_00086dc0 00089214: 000890b8_-_00089248 000893e8: 00089384_-_00089458 00089414: 00089384_-_00089458 0008c5b4: 0008c550_-_0008c5e4 000e8d74: Background_Tile_Color_For_Targeting/Movement 000e9110: Background_Tile_Color_For_Targeting/Movement 000e96c8: Background_Tile_Color_For_Targeting/Movement 000e9f28: Background_Tile_Color_For_Targeting/Movement 000ea438: Background_Tile_Color_For_Targeting/Movement 000ea4a0: Background_Tile_Color_For_Targeting/Movement 000ea65c: Background_Tile_Color_For_Targeting/Movement 000eea2c: 000ee95c_-_000eeaf4 001a580c: 001a5798_-_001a5b44 001a5f4c: 001a6010_-_001a601c 001a6460: Emitter_Control_Routine 001a66cc: Emitter_Control_Routine 001a6924: Emitter_Control_Routine 001a6dfc: Emitter_Control_Routine 001a7054: Emitter_Control_Routine 001a7084: Emitter_Control_Routine 001a7318: Emitter_Control_Routine 001a7340: Emitter_Control_Routine 001a7440: Emitter_Control_Routine 001a7468: Emitter_Control_Routine 001a8160: 001a7f5c_-_001a8668 001a822c: 001a7f5c_-_001a8668 001a8294: 001a7f5c_-_001a8668 001a84a4: 001a7f5c_-_001a8668 001a84d8: 001a7f5c_-_001a8668 001aa520: Composite_frame_loading_for_parameter_sets 001aa6a0: Composite_frame_loading_for_parameter_sets 001af1c0: 001afca4: 001b1334: 001b13d4: 001b1eb4:
