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Clear the screen with Golden Poppy!

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This commit is contained in:
Edward R. Gonzalez
2025-08-03 18:08:50 -04:00
parent f8b35bb675
commit f72f913b49
3 changed files with 31 additions and 16 deletions
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code/graphics_system/hellogpu.s
+29 -14
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@@ -17,6 +17,8 @@ gpio_port1 equ 0x1814 ; 1F801814h-Write GP1: Send GP1 Commands (Display Control)
gcmd_offset equ 24
gp_Reset equ 0x0 << gcmd_offset
; On: 0x0
; Off: 0x1
gp_DisplayEnabled equ (0x03 << gcmd_offset) | 0x0
@@ -44,7 +46,7 @@ gp_HorizontalDisplayRange_3168_608 equ 0x06 << gcmd_offset | 0xC60 << 12 | 0x260
; 0 - 9 Y1 (NTSC = 88h - (240 / 2), (PAL = A3h - (288 / 2)) ; \ scanline numbers on screen,
; 10 - 19 Y2 (NTSC = 88h + (240 / 2), (PAL = A3h + (288 / 2)) ; / relative to VSYNC
; 20 - 23 Not used (zero)
gp_VerticalDisplayRange_264_24 equ 0x07 << gcmd_offset | 0x042 << 12 | 0x018
gp_VerticalDisplayRange_264_24 equ 0x07 << gcmd_offset | 264 << 10 | 24
; GPU Draw Comamnd Format: [7:8] Command (8-bit), [0:6] Parameter (24-bit)
@@ -60,8 +62,8 @@ gp_VerticalDisplayRange_264_24 equ 0x07 << gcmd_offset | 0x042 << 12 | 0x018
; 13 Textured Rectangle Y-Flip (BIOS does set it equal to GPUSTAT.13...?)
; 14 - 23 Not used (should be 0)
; 24 - 31 Command (E1h)
@gp_ModeSetting_DrawAllowed equ 10
gp_ModeSetting_DipArea equ 0xE1 << gcmd_offset | 0x1 << @gp_ModeSetting_DrawAllowed
gp_ModeSetting_DrawAllowed equ 10
gp_ModeSetting_DipArea equ 0xE1 << gcmd_offset | 0x1 << gp_ModeSetting_DrawAllowed
; GP0(E3h) - Set Drawing Area top left (X1,Y1)
; GP0(E4h) - Set Drawing Area bottom right (X2,Y2)
@@ -100,7 +102,9 @@ gp_SetOffset equ 0xE5 << gcmd_offset
; The "Color" parameter is a 24bit RGB value, however, the actual fill data is 16bit:
; The hardware automatically converts the 24bit RGB value to 15bit RGB (with bit15=0).
; Fill is NOT affected by the Mask settings (acts as if Mask.Bit0,1 are both zero).
gvm_FillRect equ 0x02 << gcmd_offset
gp_RectFillVM_XCoord equ 0
gp_RectFillVM_YCoord equ 16
gp_RectFillVM equ 0x02 << gcmd_offset
.macro gp_push_pak, port, packet, reg_scratch
load_imm reg_scratch, packet
@@ -111,26 +115,31 @@ gvm_FillRect equ 0x02 << gcmd_offset
store_word reg_scratch, port
.endmacro
Color_PS_GoldenPoppy equ 0xF3C300
// Color_PS_GoldenPoppy equ 0xF3C300
Color_PS_GoldenPoppy equ 0x00C3F3
Color_RedFF equ 0x0000FF
main:
reg_io_offset equ rtmp_0 :: load_uimm rtmp_0, IO_BASE_ADDR
reg_io_offset equ rtmp_0
load_uimm rtmp_0, IO_BASE_ADDR
; Setup Display Control
; 1. GP1: Reset GPU
load_imm rtmp_1, 0x00000000 ; 00 = Reset GPU
store_word rtmp_1, gpio_port0(reg_io_offset) ; Writing to GP1
load_imm rtmp_1, gp_Reset ; 00 = Reset GPU
store_word rtmp_1, gpio_port1(reg_io_offset) ; Writing to GP1
; 2. GP1: Display Enable
load_imm rtmp_1, gp_DisplayEnabled
store_word rtmp_1, gpio_port0(reg_io_offset) ; Write to GP1
store_word rtmp_1, gpio_port1(reg_io_offset) ; Write to GP1
; 3. GP1: Dispaly Mode (320x240, 15-bit, NTSC)
load_imm rtmp_1, gp_DisplayMode_320x240_15bit_NTSC
store_word rtmp_1, gpio_port0(reg_io_offset) ; Write to GP1
store_word rtmp_1, gpio_port1(reg_io_offset) ; Write to GP1
; 4. GP1: Horizontal Range
load_imm rtmp_1, gp_HorizontalDisplayRange_3168_608
store_word rtmp_1, gpio_port0(reg_io_offset)
store_word rtmp_1, gpio_port1(reg_io_offset)
; 5. GP1: Vertical Range
load_imm rtmp_1, gp_VerticalDisplayRange_264_24
store_word rtmp_1, gpio_port0(reg_io_offset)
store_word rtmp_1, gpio_port1(reg_io_offset)
; Setup VRAM Access
; 1. GP0: Drawing mode settings
load_imm rtmp_1, gp_ModeSetting_DipArea
@@ -139,13 +148,19 @@ main:
load_imm rtmp_1, gp_SetArea_TopLeft | 0x0
store_word rtmp_1, gpio_port0(reg_io_offset)
; 3. GP0: Drawing area Bottom-Right
load_imm rtmp_1, gp_SetArea_BottomRight | 239 << gp_SetArea_XCoord | 319 << gp_SetArea_XCoord
load_imm rtmp_1, gp_SetArea_BottomRight | 239 << gp_SetArea_YCoord | 319 << gp_SetArea_XCoord
store_word rtmp_1, gpio_port0(reg_io_offset)
; 4. GP0: Drawing area offset X & Y
load_imm rtmp_1, gp_SetOffset | 0 << gp_SetOffset_YCoord | 0 << gp_SetOffset_XCoord
store_word rtmp_1, gpio_port0(reg_io_offset)
; TODO: Clear the screen
; Clear the screen
; 1. GP0: Fill rectangle on display area
load_imm rtmp_1, gp_RectFillVM | Color_PS_GoldenPoppy
store_word rtmp_1, gpio_port0(reg_io_offset)
load_imm rtmp_1, 0 << gp_RectFillVM_YCoord | 0 << gp_RectFillVM_XCoord
store_word rtmp_1, gpio_port0(reg_io_offset)
load_imm rtmp_1, 239 << gp_RectFillVM_YCoord | 319 << gp_RectFillVM_XCoord
store_word rtmp_1, gpio_port0(reg_io_offset)
; TODO: Draw a flat-shaded triangle
; 1. GP0: Send packets to GP0 to draw a triangle