Commands

Command Format

Field	Description
[31:24]	Opcode
[23:0]	Parameter

Opcode	Value	Description
OP_SET_X0	0	Set X0
OP_SET_Y0	1	Set Y0
OP_SET_Z0	2	Set 1/W0
OP_SET_X1	3	Set X1
OP_SET_Y1	4	Set Y1
OP_SET_Z1	5	Set 1/W1
OP_SET_X2	6	Set X2
OP_SET_Y2	7	Set Y2
OP_SET_Z2	8	Set 1/W2
OP_SET_R0	9	Set R0
OP_SET_G0	10	Set G0
OP_SET_B0	11	Set B0
OP_SET_R1	12	Set R1
OP_SET_G1	13	Set G1
OP_SET_B1	14	Set B1
OP_SET_R2	15	Set R2
OP_SET_G2	16	Set G2
OP_SET_B2	17	Set B2
OP_SET_S0	18	Set S0
OP_SET_T0	19	Set T0
OP_SET_S1	20	Set S1
OP_SET_T1	21	Set T1
OP_SET_S2	22	Set S2
OP_SET_T2	23	Set T2
OP_CLEAR	24	Clear frame buffer or depth buffer
OP_DRAW	25	Draw triangle
OP_SWAP	26	Swap the front and back buffer addresses
OP_SET_TEX_ADDR	27	Set texture address (in 16-bit word, address >> 1)
OP_SET_FB_ADDR	28	Set the frame buffer address (in 16-bit word, address >> 1)

Set a 18.14 fixed point value for a given parameter.

Field	Description
[0]	0=not textured, 1=textured
[1]	0=wrap T, 1=clamp T
[2]	0=wrap S, 1=clamp S
[3]	0=depth test disabled, 1=depth test enabled
[4]	0=perspective correction disabled, 1=perspective correction enabled
[7:5]	Texture width scale (0=32, 1=64, 2=128, 3=256, 4=512, 5=1024, 6=2048, 7=4096)
[10:8]	Texture height scale (0=32, 1=64, 2=128, 3=256, 4=512, 5=1024, 6=2048, 7=4096)
[31:24]	Opcode (25)

Field	Description
[0]	0=do not wait for vsync, 1=wait for vsync
[31:24]	Opcode (26)

Field	Description
[0:15]	16-bit value
[16]	0=LSB, 1=MSB
[17]	0=double buffer (back != front), 1=single buffer (back == front)
[31:24]	Opcode (28)