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got a flat shaded triangle!

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Edward R. Gonzalez
2025-08-03 18:57:09 -04:00
parent f72f913b49
commit 35bedb9cdd
1 changed files with 55 additions and 24 deletions
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code/graphics_system/hellogpu.s
+55 -24
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@@ -13,7 +13,7 @@ IO_BASE_ADDR equ 0x1F80 ; IO Ports Memory map base address
gpio_port0 equ 0x1810 ; 1F801810h-Write GP0: Send GP0 Commands/Packets (Rendering and VRAM Access)
gpio_port1 equ 0x1814 ; 1F801814h-Write GP1: Send GP1 Commands (Display Control) (and DMA Control)
; GPU Display Control Command Format: [7:8] Command (8-bit), [0:6] Paraemter (24-bit)
; GPU Command Format: [7:8] Command (8-bit), [0:6] Paraemter (24-bit)
gcmd_offset equ 24
@@ -21,8 +21,8 @@ gp_Reset equ 0x0 << gcmd_offset
; On: 0x0
; Off: 0x1
gp_DisplayEnabled equ (0x03 << gcmd_offset) | 0x0
gp_DisplayDisabled equ (0x03 << gcmd_offset) | 0x1
gp_DisplayEnabled equ (0x03 << gcmd_offset) | 0x0
gp_DisplayDisabled equ (0x03 << gcmd_offset) | 0x1
; GP1(08h) - Display mode
; 0-1 Horizontal Resolution 1 (0=256, 1=320, 2=512, 3=640) ;GPUSTAT.17-18
@@ -48,8 +48,6 @@ gp_HorizontalDisplayRange_3168_608 equ 0x06 << gcmd_offset | 0xC60 << 12 | 0x260
; 20 - 23 Not used (zero)
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)
;GP0(E1h) - Draw Mode setting (aka "Texpage")
; 0 - 3 Texture page X Base (N * 64) (ie. in 64-halfword steps) ; GPUSTAT.0-3
; 4 Texture page Y Base 1 (N * 256) (ie. 0, 256, 512 or 768) ; GPUSTAT.4
@@ -63,7 +61,7 @@ gp_VerticalDisplayRange_264_24 equ 0x07 << gcmd_offset | 264 << 10 | 24
; 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_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)
@@ -74,8 +72,6 @@ gp_ModeSetting_DipArea equ 0xE1 << gcmd_offset | 0x1 << gp_ModeSetting_DrawAllow
; 10 - 19 Y-coordinate (0..1023) ; \ on v2 GPU (max 2 MB VRAM)
; 20 - 23 Not used (zero) ; /
; 24 - 31 Command (Exh)
gp_SetArea_XCoord equ 0
gp_SetArea_YCoord equ 10
gp_SetArea_TopLeft equ 0xE3 << gcmd_offset
gp_SetArea_BottomRight equ 0xE4 << gcmd_offset
@@ -86,8 +82,6 @@ gp_SetArea_BottomRight equ 0xE4 << gcmd_offset
; 10-19 Y-coordinate (0..1023) ;\on v2 GPU (max 2 MB VRAM)
; 20-23 Not used (zero) ;/
; 24-31 Command (Exh)
gp_SetOffset_XCoord equ 0
gp_SetOffset_YCoord equ 10
gp_SetOffset equ 0xE5 << gcmd_offset
; GPU Memory Transfer Commands
@@ -97,14 +91,39 @@ gp_SetOffset equ 0xE5 << gcmd_offset
; 1st Color+Command (CcBbGgRrh) ;24bit RGB value (see note)
; 2nd Top Left Corner (YyyyXxxxh) ;Xpos counted in halfwords, steps of 10h
; 3rd Width+Height (YsizXsizh) ;Xsiz counted in halfwords, steps of 10h
; Fills the area in the frame buffer with the value in RGB. Horizontally the filling is done in 16-pixel (32-bytes) units
; (see below masking/rounding).
; Fills the area in the frame buffer with the value in RGB.
; Horizontally the filling is done in 16-pixel (32-bytes) units (see below masking/rounding).
; 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).
gp_RectFillVM_XCoord equ 0
gp_RectFillVM_YCoord equ 16
gp_RectFillVM equ 0x02 << gcmd_offset
gp_RectFillVM equ 0x02 << gcmd_offset
; GPU Render Polygon Commands
; When the upper 3 bits of the first GP0 command are set to 1 (001),
; then the command can be decoded using the following bitfield:
; bit number value meaning
; 31-29 001 polygon render
; 28 1/0 gouraud / flat shading
; 27 1/0 4 / 3 vertices
; 26 1/0 textured / untextured
; 25 1/0 semi-transparent / opaque
; 24 1/0 raw texture / modulation
; 23-0 rgb first color value.
gp_Poly_FirstColor equ 0
gp_Poly_RawTexture equ 1 << 24
gp_Poly_SemiTrans equ 1 << 25
gp_Poly_Textured equ 1 << 26
gp_Poly_Quad equ 1 << 27
gp_Poly_Tri equ 0 << 27
gp_Poly_ShadeFlat equ 0 << 28
gp_Poly_ShadeGourand equ 1 << 28
gp_Polygon equ 0x20 << gcmd_offset
gp_b10_X equ 0
gp_b10_Y equ 10
gp_b16_X equ 0
gp_b16_Y equ 16
.macro gp_push_pak, port, packet, reg_scratch
load_imm reg_scratch, packet
@@ -115,10 +134,14 @@ gp_RectFillVM equ 0x02 << gcmd_offset
store_word reg_scratch, port
.endmacro
// Color_PS_GoldenPoppy equ 0xF3C300
Color_RedFF equ 0x0000FF
Color_PS_GoldenPoppy equ 0x00C3F3
Color_PS_CelticBlue equ 0x723F00
Color_RedFF equ 0x0000FF
Display_Width equ 320
Display_Height equ 239
Display_HalfWidth equ 320 / 2
Display_HalfHeight equ 240 / 2
main:
reg_io_offset equ rtmp_0
@@ -145,24 +168,32 @@ main:
load_imm rtmp_1, gp_ModeSetting_DipArea
store_word rtmp_1, gpio_port0(reg_io_offset)
; 2. GP0: Drawing area Top-Left
load_imm rtmp_1, gp_SetArea_TopLeft | 0x0
load_imm rtmp_1, gp_SetArea_TopLeft | 0 << gp_b10_Y | 0 << gp_b10_X
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_YCoord | 319 << gp_SetArea_XCoord
load_imm rtmp_1, gp_SetArea_BottomRight | Display_Height << gp_b10_Y | Display_Width << gp_b10_X
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
load_imm rtmp_1, gp_SetOffset | 0 << gp_b10_Y | 0 << gp_b10_X
store_word rtmp_1, gpio_port0(reg_io_offset)
; Clear the screen
; 1. GP0: Fill rectangle on display area
load_imm rtmp_1, gp_RectFillVM | Color_PS_GoldenPoppy
load_imm rtmp_1, gp_RectFillVM | Color_PS_CelticBlue
store_word rtmp_1, gpio_port0(reg_io_offset)
load_imm rtmp_1, 0 << gp_RectFillVM_YCoord | 0 << gp_RectFillVM_XCoord
load_imm rtmp_1, 0 << gp_b16_Y | 0 << gp_b16_X
store_word rtmp_1, gpio_port0(reg_io_offset)
load_imm rtmp_1, 239 << gp_RectFillVM_YCoord | 319 << gp_RectFillVM_XCoord
load_imm rtmp_1, Display_Height << gp_b16_Y | Display_Width << gp_b16_X
store_word rtmp_1, gpio_port0(reg_io_offset)
; TODO: Draw a flat-shaded triangle
; Draw a flat-shaded triangle
; 1. GP0: Send packets to GP0 to draw a triangle
load_imm rtmp_1, gp_Polygon | Color_PS_GoldenPoppy
store_word rtmp_1, gpio_port0(reg_io_offset)
load_imm rtmp_1, -100 + Display_HalfHeight << gp_b16_Y | -100 + Display_HalfWidth << gp_b16_X
store_word rtmp_1, gpio_port0(reg_io_offset)
load_imm rtmp_1, 20 + Display_HalfHeight << gp_b16_Y | 20 + Display_HalfWidth << gp_b16_X
store_word rtmp_1, gpio_port0(reg_io_offset)
load_imm rtmp_1, -50 + Display_HalfHeight << gp_b16_Y | 30 + Display_HalfWidth << gp_b16_X
store_word rtmp_1, gpio_port0(reg_io_offset)
idle:
jump idle :: nop