constant VI_BASE($A440) // $04400000 Video Interface (VI) Base constant VI_STATUS($00) // $04400000 Status/Control constant VI_ORIGIN($04) // $04400004 Origin constant VI_WIDTH($08) // $04400008 Width constant VI_V_INTR($0C) // $0440000C Vertical Interrupt constant VI_V_CURRENT_LINE($10) // $04400010 Current Vertical Line constant VI_TIMING($14) // $04400014 Video Timing constant VI_V_SYNC($18) // $04400018 Vertical Sync constant VI_H_SYNC($1C) // $0440001C Horizontal Sync constant VI_H_SYNC_LEAP($20) // $04400020 Horizontal Sync Leap constant VI_H_VIDEO($24) // $04400024 Horizontal Video constant VI_V_VIDEO($28) // $04400028 Vertical Video constant VI_V_BURST($2C) // $0440002C Vertical Burst constant VI_X_SCALE($30) // $04400030 X-Scale constant VI_Y_SCALE($34) // $04400034 Y-Scale // VI Status Flags (lower halfword) constant BPP0($0000) // Color Depth Blank (No Data Or Sync) //*RESERVED*($0001) // Color Depth Reserved constant BPP16($0002) // Color Depth 16BPP R5/G5/B5/A1 constant BPP32($0003) // Color Depth 32BPP R8/G8/B8/A8 constant GAMMA_DITHER_EN($0004) // Gamma Dither Enable (Requires: Gamma Enable) constant GAMMA_EN($0008) // Gamma Enable (Gamma Boost For YUV Images) constant DIVOT_EN($0010) // Divot Enable (Used With Anti-alias) constant VBUS_CLK_EN($0020) // Video Bus Clock Enable constant INTERLACE($0040) // Interlace/Serrate (Used With Interlaced Display) constant TST_MODE($0080) // Test Mode constant AA_MODE_0($0000) // AA Mode 0 = Anti­alias & Resample (Always Fetch Extra Lines) constant AA_MODE_1($0100) // AA Mode 1 = Anti­alias & Resample (Fetch Extra Lines When Needed) constant AA_MODE_2($0200) // AA Mode 2 = Resample Only constant AA_MODE_3($0300) // AA Mode 3 = Replicate Pixels & No Interpolation constant DIAG_0($0400) // Diagnotic 0 constant DIAG_1($0800) // Diagnotic 1 constant PIXEL_ADV_0($0000) // Pixel Advance 0 constant PIXEL_ADV_1($1000) // Pixel Advance 1 constant PIXEL_ADV_2($2000) // Pixel Advance 2 constant PIXEL_ADV_3($3000) // Pixel Advance 3 constant PIXEL_ADV_4($4000) // Pixel Advance 4 constant PIXEL_ADV_5($5000) // Pixel Advance 5 constant PIXEL_ADV_6($6000) // Pixel Advance 6 constant PIXEL_ADV_7($7000) // Pixel Advance 7 constant PIXEL_ADV_8($8000) // Pixel Advance 8 constant PIXEL_ADV_9($9000) // Pixel Advance 9 constant PIXEL_ADV_A($A000) // Pixel Advance A constant PIXEL_ADV_B($B000) // Pixel Advance B constant PIXEL_ADV_C($C000) // Pixel Advance C constant PIXEL_ADV_D($D000) // Pixel Advance D constant PIXEL_ADV_E($E000) // Pixel Advance E constant PIXEL_ADV_F($F000) // Pixel Advance F // VI Status Flags (upper halfword) constant DITHER_FILTER_EN($10000) // Dither Filter Enable (Used With 16BPP Display) constant VI_NTSC_CLOCK(48681812) // NTSC: Hz = 48.681812 MHz constant VI_PAL_CLOCK(49656530) // PAL: Hz = 49.656530 MHz constant VI_MPAL_CLOCK(48628316) // MPAL: Hz = 48.628316 MHz // enum for video resolutions; values are arbitrary. // interlaced: constant RES_640_480(480) // no padding. constant RES_576_432(432) // 640x480 after VI padding. constant RES_512_448(448) // stretched to 640x448, 640x480 after VI padding. // not interlaced: constant RES_320_240(240) // upscaled 2x. constant RES_288_216(216) // upscaled 2x. 640x480 after VI padding. constant RES_256_224(224) // upscaled 2x, stretched to 640x448, etc. macro MakeSetScreenNTSC() { // note that you can only call this macro once. SetScreenNTSC: // this version expects to be called every frame. // a0: resolution to use (enum). // a1: desired VI settings (status/control). mutable. // a2: image color buffer origin address. mutable. // v0: zero on success, non-zero on failure (bad enum or VI settings). lui v1, VI_BASE lw t0, VI_V_CURRENT_LINE(v1) andi t0, 1 andi t1, a1, 3 // extract BPP subiu t1, 2 // now 16 BPP is 0 and 32 BPP is 1 bltz t1, SetScreenNTSC_Fail // fail if it's not set to 16 or 32 BPP lli t8, RES_640_480 // delay slot beq a0, t8, SetScreenNTSC_480 lli t9, RES_576_432 // delay slot beq a0, t9, SetScreenNTSC_432 lli t8, RES_512_448 // delay slot beq a0, t8, SetScreenNTSC_448 lli t9, RES_320_240 // delay slot beq a0, t9, SetScreenNTSC_240 lli t8, RES_288_216 // delay slot beq a0, t8, SetScreenNTSC_216 lli t9, RES_256_224 // delay slot beq a0, t9, SetScreenNTSC_224 SetScreenNTSC_Fail: lli v0, 1 // delay slot jr ra sw r0, VI_V_CURRENT_LINE(v1) // clear interrupt SetScreenNTSC_SetInterlaced: bnez t0, SetScreenNTSC_Set // nothing more to do on odd (top) fields. ori a1, INTERLACE // handle even (bottom) fields. addu a2, t2 // add width to origin addu a2, t2 // and again for a full row (when 16 BPP) beqz t1, SetScreenNTSC_Set // branch when 16 BPP subiu t7, 2 // prevents bottom line from displaying out-of-bounds garbage addu a2, t2 addu a2, t2 // full row (when 32 BPP) SetScreenNTSC_Set: lw t1, VI_V_CURRENT_LINE(v1) // variable stuff: sw t1, VI_V_CURRENT_LINE(v1) sw t2, VI_WIDTH(v1) // VI_H_WIDTH sw t3, VI_V_SYNC(v1) sw t4, VI_X_SCALE(v1) sw t5, VI_Y_SCALE(v1) sw t6, VI_H_VIDEO(v1) // VI_H_START sw t7, VI_V_VIDEO(v1) // VI_V_START // constant stuff: lli t1, 2 li t2, 57 | (34 << 8) | (5 << 16) | (62 << 20) lli t3, 3093 li t4, 3093 | (3093 << 16) li t5, (0x0E << 16) | 0x204 sw t1, VI_V_INTR(v1) // VI_INTR sw t2, VI_TIMING(v1) // VI_BURST sw t3, VI_H_SYNC(v1) sw t4, VI_H_SYNC_LEAP(v1) // VI_LEAP sw t5, VI_V_BURST(v1) // final variable stuff: sw a1, VI_STATUS(v1) // VI_CONTROL sw a2, VI_ORIGIN(v1) // VI_DRAM_ADDR jr ra lli v0, 0 SetScreenNTSC_480: lli t2, 640 li t4, 0x400 li t5, 0x800 | (0x200 << 16) li t6, (0x6C << 16) | (0x6C + 640) li t7, (0x23 << 16) | (0x23 + 480) b SetScreenNTSC_SetInterlaced lli t3, 525 - 1 SetScreenNTSC_432: lli t2, 576 li t4, 0x400 li t5, 0x800 | (0x200 << 16) li t6, (0x8C << 16) | (0x8C + 576) li t7, (0x3B << 16) | (0x3B + 432) b SetScreenNTSC_SetInterlaced lli t3, 525 - 1 SetScreenNTSC_448: lli t2, 512 li t4, (512 * 256 + 128) / 160 li t5, 0x800 | (0x200 << 16) li t6, (0x6C << 16) | (0x6C + 640) li t7, (0x33 << 16) | (0x33 + 448) b SetScreenNTSC_SetInterlaced lli t3, 525 - 1 SetScreenNTSC_240: lli t2, 320 li t4, 0x200 li t5, 0x400 li t6, (0x6C << 16) | (0x6C + 640) li t7, (0x23 << 16) | (0x23 + 480) b SetScreenNTSC_Set lli t3, 525 SetScreenNTSC_216: lli t2, 288 li t4, 0x200 li t5, 0x400 li t6, (0x8C << 16) | (0x8C + 576) li t7, (0x3B << 16) | (0x3B + 432) b SetScreenNTSC_Set lli t3, 525 SetScreenNTSC_224: lli t2, 256 li t4, (256 * 256 + 128) / 160 li t5, 0x400 li t6, (0x6C << 16) | (0x6C + 640) li t7, (0x33 << 16) | (0x33 + 448) b SetScreenNTSC_Set lli t3, 525 } macro ScreenNTSC(width,height, status, origin) { lui a0,VI_BASE // A0 = VI Base Register ($A4400000) la t0,{origin} // T0 = Origin (Frame Buffer Origin In Bytes) sw t0,VI_ORIGIN(a0) // Store Origin To VI Origin Register ($A4400004) lli t0,{width} // T0 = Width (Frame Buffer Line Width In Pixels) sw t0,VI_WIDTH(a0) // Store Width To VI Width Register ($A4400008) lli t0,$2 // T0 = Vertical Interrupt (Interrupt When Current Half-Line $2) sw t0,VI_V_INTR(a0) // Store Vertical Interrupt To VI Interrupt Register ($A440000C) lli t0,0 // T0 = Current Vertical Line (Current Half-Line, Sampled Once Per Line = 0) sw t0,VI_V_CURRENT_LINE(a0) // Store Current Vertical Line To VI Current Register ($A4400010) li t0,$3E52239 // T0 = Video Timing (Start Of Color Burst In Pixels from H-Sync = 3, Vertical Sync Width In Half Lines = 229, Color Burst Width In Pixels = 34, Horizontal Sync Width In Pixels = 57) sw t0,VI_TIMING(a0) // Store Video Timing To VI Burst Register ($A4400014) lli t0,$20D // T0 = Vertical Sync (Number Of Half-Lines Per Field = 525) sw t0,VI_V_SYNC(a0) // Store Vertical Sync To VI V Sync Register ($A4400018) lli t0,$C15 // T0 = Horizontal Sync (5-bit Leap Pattern Used For PAL only = 0, Total Duration Of A Line In 1/4 Pixel = 3093) sw t0,VI_H_SYNC(a0) // Store Horizontal Sync To VI H Sync Register ($A440001C) li t0,$C150C15 // T0 = Horizontal Sync Leap (Identical To H Sync = 3093, Identical To H Sync = 3093) sw t0,VI_H_SYNC_LEAP(a0) // Store Horizontal Sync Leap To VI Leap Register ($A4400020) li t0,$6C02EC // T0 = Horizontal Video (Start Of Active Video In Screen Pixels = 108, End Of Active Video In Screen Pixels = 748) sw t0,VI_H_VIDEO(a0) // Store Horizontal Video To VI H Start Register ($A4400024) li t0,$2501FF // T0 = Vertical Video (Start Of Active Video In Screen Half-Lines = 37, End Of Active Video In Screen Half-Lines = 511) sw t0,VI_V_VIDEO(a0) // Store Vertical Video To VI V Start Register ($A4400028) li t0,$E0204 // T0 = Vertical Burst (Start Of Color Burst Enable In Half-Lines = 14, End Of Color Burst Enable In Half-Lines = 516) sw t0,VI_V_BURST(a0) // Store Vertical Burst To VI V Burst Register ($A440002C) lli t0,($100*({width}/160)) // T0 = X-Scale (Horizontal Subpixel Offset In 2.10 Format = 0, 1/Horizontal Scale Up Factor In 2.10 Format) sw t0,VI_X_SCALE(a0) // Store X-Scale To VI X Scale Register ($A4400030) lli t0,($100*({height}/60)) // T0 = Y-Scale (Vertical Subpixel Offset In 2.10 Format = 0, 1/Vertical Scale Up Factor In 2.10 Format) sw t0,VI_Y_SCALE(a0) // Store Y-Scale To VI Y Scale Register ($A4400034) li t0,{status} // T0 = Status/Control sw t0,VI_STATUS(a0) // Store Status/Control To VI Status Register ($A4400000) } macro ScreenPAL(width,height, status, origin) { lui a0,VI_BASE // A0 = VI Base Register ($A4400000) la t0,{origin} // T0 = Origin (Frame Buffer Origin In Bytes) sw t0,VI_ORIGIN(a0) // Store Origin To VI Origin Register ($A4400004) lli t0,{width} // T0 = Width (Frame Buffer Line Width In Pixels) sw t0,VI_WIDTH(a0) // Store Width To VI Width Register ($A4400008) lli t0,$2 // T0 = Vertical Interrupt (Interrupt When Current Half-Line $2) sw t0,VI_V_INTR(a0) // Store Vertical Interrupt To VI Interrupt Register ($A440000C) lli t0,0 // T0 = Current Vertical Line (Current Half-Line, Sampled Once Per Line = 0) sw t0,VI_V_CURRENT_LINE(a0) // Store Current Vertical Line To VI Current Register ($A4400010) li t0,$404233A // T0 = Video Timing (Start Of Color Burst In Pixels from H-Sync = 4, Vertical Sync Width In Half Lines = 04, Color Burst Width In Pixels = 35, Horizontal Sync Width In Pixels = 58) sw t0,VI_TIMING(a0) // Store Video Timing To VI Burst Register ($A4400014) lli t0,$271 // T0 = Vertical Sync (Number Of Half-Lines Per Field = 625) sw t0,VI_V_SYNC(a0) // Store Vertical Sync To VI V Sync Register ($A4400018) li t0,$150C69 // T0 = Horizontal Sync (5-bit Leap Pattern Used For PAL only = 21: %10101, Total Duration Of A Line In 1/4 Pixel = 3177) sw t0,VI_H_SYNC(a0) // Store Horizontal Sync To VI H Sync Register ($A440001C) li t0,$C6F0C6E // T0 = Horizontal Sync Leap (Identical To H Sync = 3183, Identical To H Sync = 3182) sw t0,VI_H_SYNC_LEAP(a0) // Store Horizontal Sync Leap To VI Leap Register ($A4400020) li t0,$800300 // T0 = Horizontal Video (Start Of Active Video In Screen Pixels = 128, End Of Active Video In Screen Pixels = 768) sw t0,VI_H_VIDEO(a0) // Store Horizontal Video To VI H Start Register ($A4400024) li t0,$5F0239 // T0 = Vertical Video (Start Of Active Video In Screen Half-Lines = 95, End Of Active Video In Screen Half-Lines = 569) sw t0,VI_V_VIDEO(a0) // Store Vertical Video To VI V Start Register ($A4400028) li t0,$9026B // T0 = Vertical Burst (Start Of Color Burst Enable In Half-Lines = 9, End Of Color Burst Enable In Half-Lines = 619) sw t0,VI_V_BURST(a0) // Store Vertical Burst To VI V Burst Register ($A440002C) lli t0,($100*({width}/160)) // T0 = X-Scale (Horizontal Subpixel Offset In 2.10 Format = 0, 1/Horizontal Scale Up Factor In 2.10 Format) sw t0,VI_X_SCALE(a0) // Store X-Scale To VI X Scale Register ($A4400030) lli t0,($100*({height}/60)) // T0 = Y-Scale (Vertical Subpixel Offset In 2.10 Format = 0, 1/Vertical Scale Up Factor In 2.10 Format) sw t0,VI_Y_SCALE(a0) // Store Y-Scale To VI Y Scale Register ($A4400034) li t0,{status} // T0 = Status/Control sw t0,VI_STATUS(a0) // Store Status/Control To VI Status Register ($A4400000) } macro WaitScanline(scanline) { // Wait For RDP To Reach Scanline lui a0,VI_BASE // A0 = VI Base Register ($A4400000) lli t0,{scanline} // T0 = Scan Line - lw t1,VI_V_CURRENT_LINE(a0) // T1 = Current Scan Line bne t1,t0,- // IF (Current Scan Line != Scan Line) Wait nop // ELSE Continue (Delay Slot) }