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got gp_screen_init working on the assembler side!

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Will not be doing most of the course in assembly for now.
Assemblers are missing a bunch of ergonomics not related to to instruction abstraction. Mostly related to offset and data typw width calulations and how to ergonomically utilize those symbols within the assembly syntax. The GNU gas macros are terrible and struct member resolution must be done manually.
There is no utilities for doing stack allocations with alignment in mind either, no way to get info on the system's calling convention for foreign symbols (not even as a diagnostic, etc).

C is a terrible for inline assembly, and gas doesn't support grabbing C struct info from header files (even though they are part of the same toolchain collection).
There is no utilities for doing stack allocations with alignment in mind either, no way to get info on the system's calling convention for foreign symbols (not even as a diagnostic, etc).

Low-level dev really is in a catch 22 of bad tooling.
This commit is contained in:
Edward R. Gonzalez
2025-09-13 21:49:10 -04:00
parent ebc6895c61
commit e04bcb91b4
9 changed files with 269 additions and 116 deletions
Download Patch File Download Diff File Expand all files Collapse all files
.gitignore
+1 -1
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@@ -1,8 +1,8 @@
build build
psxdev_sample
toolchain/armips toolchain/armips
toolchain/pcsx-redux toolchain/pcsx-redux
toolchain/psyq_iwyu toolchain/psyq_iwyu
toolchain/PSn00bSDK
*.exe *.exe
*.elf *.elf
.vscode/settings.json
Vendored
+7 -1
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@@ -24,6 +24,12 @@
"string_view": "c", "string_view": "c",
"functional": "c", "functional": "c",
"tuple": "c", "tuple": "c",
"hello_gpu.h": "c" "hello_gpu.h": "c",
"compare": "c",
"ratio": "c",
"scoped_allocator": "c",
"variant": "c",
"math.h": "c",
"cstdint": "c"
} }
} }
code/asmdd/dsl.s
+55 -11
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@@ -11,10 +11,19 @@
.macro load_uimm p1, p2 .macro load_uimm p1, p2
lui \p1, \p2 lui \p1, \p2
.endm .endm
.macro load_half p1, p2
lh \p1, \p2
.endm
.macro load_word p1, p2 .macro load_word p1, p2
lw \p1, \p2 lw \p1, \p2
.endm .endm
# Store # Store
.macro store_byte p1, p2
sb \p1, \p2
.endm
.macro store_half p1, p2
sh \p1, \p2
.endm
.macro store_word p1, p2 .macro store_word p1, p2
sw \p1, \p2 sw \p1, \p2
.endm .endm
@@ -33,14 +42,14 @@
add \p1, \p2, \p3 add \p1, \p2, \p3
.endm .endm
.macro add_u p1, p2, p3 .macro add_u p1, p2, p3
add \p1, \p2, \p3 addu \p1, \p2, \p3
.endm .endm
.macro add_si p1, p2, p3 .macro add_si p1, p2, p3
addi \p1, \p2, \p3 addi \p1, \p2, \p3
.endm .endm
.macro add_ui p1, p2, p3 .macro add_ui p1, p2, p3
addiu \p1, \p2, \p3 addiu \p1, \p2, \p3
.endm .endm
# Subtraction # Subtraction
.macro sub_s p1, p2, p3 .macro sub_s p1, p2, p3
sub \p1, \p2, \p3 sub \p1, \p2, \p3
@@ -49,7 +58,18 @@
subu \p1, \p2, \p3 subu \p1, \p2, \p3
.endm .endm
# Multiplication # Multiplication
.macro mult_s p1, p2
mult \p1, \p2
.endm
.macro mult_u p1, p2
multu \p1, \p2
.endm
.macro mult_si p1, p2
multi \p1, \p2
.endm
.macro mult_ui p1, p2
multui \p1, \p2
.endm
# Division # Division
.macro div_s p1, p2 .macro div_s p1, p2
div \p1, \p2 div \p1, \p2
@@ -122,14 +142,38 @@
# Subroutine return address when doing a sub # Subroutine return address when doing a sub
.set rret_addr, $ra .set rret_addr, $ra
.macro align8 size
(\size + 7) & ~7
.endm
.macro def_cf_sp_size size
.set cf_ssize, (\size + 7) & ~7
.endm
.macro stack_alloc amount
add_ui $sp, $sp, - \amount
.endm
.macro stack_release amount
add_ui $sp, $sp, \amount
.endm
# Data Widths # Data Widths
.set byte, 1 .set byte, 1
.set word, 4 .set word, 4
.macro stack_alloc amount .equ U8, 1
add_ui $sp, - \amount .equ S8, 1
.endm .equ U16, 2
.equ S16, 2
.equ U32, 4
.equ S32, 4
.equ SSIZE, 4
.equ USIZE, 4
.equ B8, S8
.equ B16, S16
.equ B32, S32
.macro stack_release amount .equ false, 0
add_ui $sp, \amount .equ true, 1
.endm .equ true_overflow, 3
code/asmdd/gp.s
+4 -4
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@@ -177,10 +177,10 @@
.equiv gp_b16_X, 0 .equiv gp_b16_X, 0
.equiv gp_b16_Y, 16 .equiv gp_b16_Y, 16
.equiv RGB8_r, 0 .equiv RGB8_r, 0
.equiv RGB8_g, 1 .equiv RGB8_g, 1
.equiv RGB8_b, 2 .equiv RGB8_b, 2
.equiv sizeof_RGB8, 3 .equiv RGB8, 3
.equiv gp_pixel16, (2 * byte) .equiv gp_pixel16, (2 * byte)
.equiv gp_pixel24, (3 * byte) .equiv gp_pixel24, (3 * byte)
code/asmdd/math.s
+38 -36
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@@ -1,44 +1,46 @@
.equ A2_S16, (S16 * 2)
.equ A2_S32, (S32 * 2)
# Extent_2S16 { S16 width; S16 height; } # Extent_2S16 { S16 width; S16 height; }
.equ Extent_2S16_width, 0 .equ Extent_2S16_width, (S16 * 0)
.equ Extent_2S16_height, 2 .equ Extent_2S16_height, (S16 * 1)
.equ sizeof_Extent_2S16, 4 .equ Extent_2S16, (S16 * 2)
# Extent_2S32 { S32 width; S32 height; } # Extent_2S32 { S32 width; S32 height; }
.equ Extent_2S32_width, 0 .equ Extent_2S32_width, (S32 * 0)
.equ Extent_2S32_height, 4 .equ Extent_2S32_height, (S32 * 1)
.equ sizeof_Extent_2S32, 8 .equ Extent_2S32, (S32 * 2)
# Vec_2S16 { S16 x; S16 y; } # Vec_2S16 { S16 x; S16 y; }
.equ Vec_2S16_x, 0 .equ Vec_2S16_x, (S16 * 0)
.equ Vec_2S16_y, 2 .equ Vec_2S16_y, (S16 * 1)
.equ sizeof_Vec_2S16, 4 .equ Vec_2S16, (S16 * 2)
# Vec_2S32 { S32 x; S32 y; } # Vec_2S32 { S32 x; S32 y; }
.equ Vec_2S32_x, 0 .equ Vec_2S32_x, (S32 * 0)
.equ Vec_2S32_y, 4 .equ Vec_2S32_y, (S32 * 1)
.equ sizeof_Vec_2S32, 8 .equ Vec_2S32, (S32 * 2)
# Range_2S16 { Vec_2S16 p0; Vec_2S16 p1; } # Range_2S16 { Vec_2S16 p0; Vec_2S16 p1; }
.equ Range_2S16_p0, 0 .equ Range_2S16_p0, (Vec_2S16 * 0)
.equ Range_2S16_p0_x, 0 .equ Range_2S16_p1, (Vec_2S16 * 1)
.equ Range_2S16_p0_y, 2 .equ Range_2S16_p0_x, (S16 * 0)
.equ Range_2S16_p1, 4 .equ Range_2S16_p0_y, (S16 * 1)
.equ Range_2S16_p1_x, 4 .equ Range_2S16_p1_x, (S16 * 2)
.equ Range_2S16_p1_y, 6 .equ Range_2S16_p1_y, (S16 * 3)
.equ sizeof_Range_2S16, 8 .equ Range_2S16, (S16 * 4)
# Range_2S32 { Vec_2S32 p0; Vec_2S32 p1; } # Range_2S32 { Vec_2S32 p0; Vec_2S32 p1; }
.equ Range_2S32_p0, 0 .equ Range_2S32_p0, (Vec_2S32 * 0)
.equ Range_2S32_p0_x, 0 .equ Range_2S32_p1, (Vec_2S32 * 1)
.equ Range_2S32_p0_y, 4 .equ Range_2S32_p0_x, (S32 * 0)
.equ Range_2S32_p1, 8 .equ Range_2S32_p0_y, (S32 * 1)
.equ Range_2S32_p1_x, 8 .equ Range_2S32_p1_x, (S32 * 2)
.equ Range_2S32_p1_y, 12 .equ Range_2S32_p1_y, (S32 * 3)
.equ sizeof_Range_2S32, 16 .equ Range_2S32, (S32 * 4)
# Rect_S16 { S16 x; S16 y; S16 width; S16 height; } # Rect_S16 { S16 x; S16 y; S16 width; S16 height; }
.equ Rect_S16_x, 0 .equ Rect_S16_x, (S16 * 0)
.equ Rect_S16_y, 2 .equ Rect_S16_y, (S16 * 1)
.equ Rect_S16_width, 4 .equ Rect_S16_width, (S16 * 2)
.equ Rect_S16_height, 6 .equ Rect_S16_height, (S16 * 3)
.equ sizeof_Rect_S16, 8 .equ Rect_S16, (S16 * 4)
# Rect_S32 { S32 x; S32 y; S32 width; S32 height; } # Rect_S32 { S32 x; S32 y; S32 width; S32 height; }
.equ Rect_S32_x, 0 .equ Rect_S32_x, (S32 * 0)
.equ Rect_S32_y, 4 .equ Rect_S32_y, (S32 * 1)
.equ Rect_S32_width, 8 .equ Rect_S32_width, (S32 * 2)
.equ Rect_S32_height, 12 .equ Rect_S32_height, (S32 * 3)
.equ sizeof_Rect_S32, 16 .equ Rect_S32, (S32 * 4)
code/duffle/gp.h
+5 -1
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@@ -85,4 +85,8 @@ typedef BYTE gp_Pixel24[3];
typedef def_struct(gp_Vec2) { U16 y; U16 x; }; typedef def_struct(gp_Vec2) { U16 y; U16 x; };
void gp_screen_init(void) __asm__("gp_screen_init"); #if 1
void gp_screen_init(void) __asm__("gp_screen_init_asm");
#else
#define gp_screen_init() gp_screen_init_c11()
#endif
code/graphics_hello_psyq/hello_gpu.c
+15 -12
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@@ -13,10 +13,13 @@ S16 active_screen_buffer;
void gp_screen_init_c11(void) void gp_screen_init_c11(void)
{ {
ResetGraph(0); ResetGraph(0);
SetDispMask(1); // gp_DisplayEnabled
// Just setting env data, not interacting with console hw.
// First buffer area // First buffer area
SetDefDispEnv((DISPENV*)& screen_buffer.display[0], 0, 0, ScreenRes_X, ScreenRes_Y); SetDefDispEnv((DISPENV*)& screen_buffer.display[0], 0, 0, ScreenRes_X, ScreenRes_Y);
SetDefDrawEnv((DRAWENV*)& screen_buffer.draw [0], 0, ScreenRes_Y, ScreenRes_X, ScreenRes_Y); SetDefDrawEnv((DRAWENV*)& screen_buffer.draw [0], 0, ScreenRes_Y, ScreenRes_X, ScreenRes_Y);
// Second buffer rea // Second buffer area
SetDefDispEnv((DISPENV*)& screen_buffer.display[1], 0, ScreenRes_Y, ScreenRes_X, ScreenRes_Y); SetDefDispEnv((DISPENV*)& screen_buffer.display[1], 0, ScreenRes_Y, ScreenRes_X, ScreenRes_Y);
SetDefDrawEnv((DRAWENV*)& screen_buffer.draw [1], 0, 0, ScreenRes_X, ScreenRes_Y); SetDefDrawEnv((DRAWENV*)& screen_buffer.draw [1], 0, 0, ScreenRes_X, ScreenRes_Y);
// Set the back/drawing buffer // Set the back/drawing buffer
@@ -27,17 +30,20 @@ void gp_screen_init_c11(void)
screen_buffer.draw[1].initial_bg_color = (RGB8){ .r = 127, .g = 63, .b = 0 }; screen_buffer.draw[1].initial_bg_color = (RGB8){ .r = 127, .g = 63, .b = 0 };
// Set the current initial buffer // Set the current initial buffer
active_screen_buffer = 0; active_screen_buffer = 0;
PutDispEnv((DISPENV*)& screen_buffer.display[active_screen_buffer]); PutDispEnv((DISPENV*)& screen_buffer.display[active_screen_buffer]);
PutDrawEnv((DRAWENV*)& screen_buffer.draw [active_screen_buffer]);
DRAWENV* wtf = (DRAWENV*)& screen_buffer.draw [active_screen_buffer];
PutDrawEnv(wtf);
// Initialize and setup the GTE geometry offsets // Initialize and setup the GTE geometry offsets
InitGeom(); InitGeom();
SetGeomOffset(ScreenRes_CenterX, ScreenRes_CenterY); SetGeomOffset(ScreenRes_CenterX, ScreenRes_CenterY);
SetGeomScreen(ScreenRes_CenterX); SetGeomScreen(ScreenRes_CenterX);
// Enable display
SetDispMask(1);
} }
void gp_display_frame_c11(void) { void gp_display_frame(void) {
DrawSync(0); DrawSync(0);
VSync(0); VSync(0);
PutDispEnv((DISPENV*)& screen_buffer.display[active_screen_buffer]); PutDispEnv((DISPENV*)& screen_buffer.display[active_screen_buffer]);
@@ -48,19 +54,16 @@ void gp_display_frame_c11(void) {
active_screen_buffer = !active_screen_buffer; // Swap current buffer active_screen_buffer = !active_screen_buffer; // Swap current buffer
} }
void render_c11(void) { void render(void) {
} }
int main(void) int main(void)
{ {
// gp_screen_init(); gp_screen_init();
gp_screen_init_c11();
while (1) while (1)
{ {
render_c11(); render();
gp_display_frame_c11(); gp_display_frame();
}; };
return 0; return 0;
} }
code/graphics_hello_psyq/hello_gpu.s
+143 -49
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@@ -5,69 +5,163 @@
.include "./asmdd/io.s" .include "./asmdd/io.s"
.include "./asmdd/gp.s" .include "./asmdd/gp.s"
# DrawEnv_Packed # DrawEnv_Packed { U32 tag; U32 code[15]; }
.equ DrawEnv_Packed_tag, 0 .equ DrawEnv_Packed_tag, 0
.equ DrawEnv_Packed_code, 4 .equ DrawEnv_Packed_code, DrawEnv_Packed_tag + U32
.equ sizeof_DrawEnv_Packed, 64 .equ DrawEnv_Packed, 64
# DrawEnv # DrawEnv { Rect_S16 clip; Vec_2S16 ofs; Rect_S16 tw; U16 tpage; U8 dtd; U8 dfe; U8 tme; U8 r0,g0,b0; DR_ENV dr_env; }
.equ DrawEnv_clip_area, 0 .equ DrawEnv_clip_area, /* 0 */ Rect_S16 * 0
.equ DrawEnv_drawing_offset, 8 .equ DrawEnv_drawing_offset, /* 8 */ A2_S16 * 0 + Rect_S16
.equ DrawEnv_texture_window, 12 .equ DrawEnv_texture_window, /* 12 */ Rect_S16 * 0 + A2_S16 + DrawEnv_drawing_offset
.equ DrawEnv_texture_page, 20 .equ DrawEnv_texture_page, /* 20 */ S16 * 0 + Rect_S16 + DrawEnv_texture_window
.equ DrawEnv_flag_dither, 22 .equ DrawEnv_flag_dither, /* 22 */ byte * 0 + S16 + DrawEnv_texture_page
.equ DrawEnv_flag_draw_on_display, 23 .equ DrawEnv_flag_draw_on_display, /* 23 */ byte * 0 + byte + DrawEnv_flag_dither
.equ DrawEnv_enable_auto_clear, 24 .equ DrawEnv_enable_auto_clear, /* 24 */ byte * 0 + byte + DrawEnv_flag_draw_on_display
.equ DrawEnv_initial_bg_color, 25 .equ DrawEnv_initial_bg_color, /* 25 */ RGB8 * 0 + byte + DrawEnv_enable_auto_clear
.equ DrawEnv_dr_env, 28 .equ DrawEnv_dr_env, /* 28 */ DrawEnv_Packed * 0 + RGB8 + DrawEnv_initial_bg_color
.equ sizeof_DrawEnv, 92 .equ DrawEnv, /* 92 */ DrawEnv_dr_env + DrawEnv_Packed
# DisplayEnv # DisplayEnv { Rect_S16 disp; Rect_S16 screen; U8 isinter; U8 isrgb24; U8 pad[2]; }
.equ DisplayEnv_display_area, 0 .equ DisplayEnv_display_area, Rect_S16 * 0
.equ DisplayEnv_screen, 8 .equ DisplayEnv_screen, Rect_S16 * 0 + Rect_S16 + DisplayEnv_display_area
.equ DisplayEnv_vinterlace, 16 .equ DisplayEnv_vinterlace, byte * 0 + Rect_S16 + DisplayEnv_screen
.equ DisplayEnv_color24, 17 .equ DisplayEnv_color24, byte * 0 + byte + DisplayEnv_vinterlace
.equ DisplayEnv_pad0, 18 .equ DisplayEnv_pad0, byte * 0 + byte + DisplayEnv_color24
.equ DisplayEnv_pad1, 19 .equ DisplayEnv_pad1, byte * 0 + byte + DisplayEnv_pad0
.equ sizeof_DisplayEnv, 20 .equ DisplayEnv, DisplayEnv_pad1 + byte
# DoubleBuffer # DoubleBuffer { DrawEnv draw[2]; DisplayEnv display[2]; }
.equ DoubleBuffer_draw, 0 .equ DoubleBuffer_draw, 0
.equ DoubleBuffer_draw_0, 0 .equ DoubleBuffer_draw_0, (DrawEnv * 0)
.equ DoubleBuffer_draw_1, 92 # 0 + sizeof_DrawEnv .equ DoubleBuffer_draw_1, (DrawEnv * 1)
.equ DoubleBuffer_display, 184 # 92 * 2 .equ DoubleBuffer_display, (DrawEnv * 2)
.equ DoubleBuffer_display_0, 184 .equ DoubleBuffer_display_0, (DisplayEnv * 0) + DoubleBuffer_display
.equ DoubleBuffer_display_1, 204 # 184 + sizeof_DisplayEnv .equ DoubleBuffer_display_1, (DisplayEnv * 1) + DoubleBuffer_display
.equ sizeof_DoubleBuffer, 224 .equ DoubleBuffer, (DisplayEnv * 2) + DoubleBuffer_display
# Screen Constants # Screen Constants
.equ ScreenRes_X, 320 .equ ScreenRes_X, 320
.equ ScreenRes_Y, 240 .equ ScreenRes_Y, 240
.equ ScreenRes_CenterX, (ScreenRes_X >> 1) .equ ScreenRes_CenterX, (ScreenRes_X >> 1)
.equ ScreenRes_CenterY, (ScreenRes_Y >> 1) .equ ScreenRes_CenterY, (ScreenRes_Y >> 1)
.equ CF_Shadow, 16
.extern ResetGraph
.equ ResetGraph_mode, rarg_0
.global gp_screen_init .extern SetDispMask
.type gp_screen_init, @function .equ SetDispMask_mask, rarg_0
gp_screen_init:
.extern PutDispEnv
.extern PutDrawEnv
.equ PutDispEnv_env, rarg_0
.equ PutDrawEnv_env, rarg_0
.extern SetDefDispEnv
.equ SetDefDispEnv_env, rarg_0
.equ SetDefDispEnv_x, rarg_1
.equ SetDefDispEnv_y, rarg_2
.equ SetDefDispEnv_w, rarg_3
.equ SetDefDispEnv_h, CF_Shadow
.set SetDefDispEnv_sp_size, CF_Shadow + S32
.extern SetDefDrawEnv
.equ SetDefDrawEnv_env, rarg_0
.equ SetDefDrawEnv_x, rarg_1
.equ SetDefDrawEnv_y, rarg_2
.equ SetDefDrawEnv_w, rarg_3
.equ SetDefDrawEnv_h, CF_Shadow
.set SetDefDrawEnv_sp_size, CF_Shadow + S32
.extern SetGeomOffset
.equ SetGeomOffset_x, rarg_0
.equ SetGeomOffset_y, rarg_1
.extern SetGeomScreen
.equ SetGeomScreen_h, rarg_0
.global gp_screen_init_asm
.type gp_screen_init_asm, @function
gp_screen_init_asm:
.equiv rio_offset, rtmp_0 .equiv rio_offset, rtmp_0
load_imm rtmp_0, IO_BASE_ADDR load_imm rtmp_0, IO_BASE_ADDR
#define gp0 gpio_port0(rio_offset) #define gp0 gpio_port0(rio_offset)
#define gp1 gpio_port1(rio_offset) #define gp1 gpio_port1(rio_offset)
gcmd_push gp1, rtmp_1, gp_Reset def_cf_sp_size 0x80;
gcmd_push gp1, rtmp_1, gp_DisplayEnabled stack_alloc cf_ssize
gcmd_push gp1, rtmp_1, gp_DisplayMode_320x240_15bit_NTSC store_word rret_addr, 0($sp)
gcmd_push gp1, rtmp_1, gp_HorizontalDisplayRange_3168_608
gcmd_push gp1, rtmp_1, gp_VerticalDisplayRange_264_24
jump_reg rret_addr; nop // Note(Ed): Cannot be used psyq manages things related to vblank and other things so the api must be called instead
// gcmd_push gp1, rtmp_1, gp_Reset // ResetGraph(0)
// gcmd_push gp1, rtmp_1, gp_DisplayEnabled // SetDispMask(1)
load_imm ResetGraph_mode, gp_Reset; jump_nlink ResetGraph
load_imm SetDispMask_mask, 1; jump_nlink SetDispMask
// First buffer area
load_addr rtmp_0, screen_buffer; add_ui SetDefDispEnv_env, rtmp_0, DoubleBuffer_display_0
move SetDefDispEnv_x, $zero
move SetDefDispEnv_y, $zero
load_imm SetDefDispEnv_w, ScreenRes_X
load_imm rtmp_0, ScreenRes_Y; store_word rtmp_0, SetDefDispEnv_h($sp)
jump_nlink SetDefDispEnv
load_addr rtmp_0, screen_buffer; add_ui SetDefDrawEnv_env, rtmp_0, DoubleBuffer_draw_0
move SetDefDrawEnv_x, $zero
load_imm SetDefDrawEnv_y, ScreenRes_Y
load_imm SetDefDrawEnv_w, ScreenRes_X
load_imm rtmp_0, ScreenRes_Y; store_word rtmp_0, SetDefDrawEnv_h($sp)
jump_nlink SetDefDrawEnv
// Second buffer area
load_addr rtmp_0, screen_buffer; add_ui SetDefDispEnv_env, rtmp_0, DoubleBuffer_display_1
move SetDefDispEnv_x, $zero
load_imm SetDefDispEnv_y, ScreenRes_Y
load_imm SetDefDispEnv_w, ScreenRes_X
load_imm rtmp_0, ScreenRes_Y; store_word rtmp_0, SetDefDispEnv_h($sp)
jump_nlink SetDefDispEnv
load_addr rtmp_0, screen_buffer; add_ui SetDefDrawEnv_env, rtmp_0, DoubleBuffer_draw_1
move SetDefDrawEnv_x, $zero
move SetDefDrawEnv_y, $zero
load_imm SetDefDrawEnv_w, ScreenRes_X
load_imm rtmp_0, ScreenRes_Y; store_word rtmp_0, SetDefDrawEnv_h($sp)
jump_nlink SetDefDrawEnv
// Set the back/drawing buffer
load_imm rtmp_1, true
load_addr rtmp_0, screen_buffer;
store_word rtmp_1, DoubleBuffer_draw_0 + DrawEnv_enable_auto_clear(rtmp_0)
store_word rtmp_1, DoubleBuffer_draw_1 + DrawEnv_enable_auto_clear(rtmp_0)
// Set background clear color
move rtmp_1, $zero; load_imm rtmp_2, 63; load_imm rtmp_3, 127
// 63, 0, 127
store_byte rtmp_2, DoubleBuffer_draw_0 + DrawEnv_initial_bg_color + RGB8_r(rtmp_0)
store_byte rtmp_1, DoubleBuffer_draw_0 + DrawEnv_initial_bg_color + RGB8_g(rtmp_0)
store_byte rtmp_3, DoubleBuffer_draw_0 + DrawEnv_initial_bg_color + RGB8_b(rtmp_0)
// 127, 63, 0
store_byte rtmp_3, DoubleBuffer_draw_1 + DrawEnv_initial_bg_color + RGB8_r(rtmp_0)
store_byte rtmp_2, DoubleBuffer_draw_1 + DrawEnv_initial_bg_color + RGB8_g(rtmp_0)
store_byte rtmp_1, DoubleBuffer_draw_1 + DrawEnv_initial_bg_color + RGB8_b(rtmp_0)
load_addr rtmp_0, active_screen_buffer; store_word rtmp_1, 0(rtmp_0)
load_addr rtmp_1, active_screen_buffer; load_half rtmp_1, 0(rtmp_1); // rtmp_1 = active_screen_buffer
load_imm rtmp_2, DisplayEnv; mult_u rtmp_1, rtmp_2; mov_from_low rtmp_2 // rtmp_2 = DisplayEnv.type_size * active_screen_Buffer (rtmp_1)
add_ui rtmp_2, rtmp_2, DoubleBuffer_display // rtmp_2 += DoubleBuffer.display
load_addr rtmp_0, screen_buffer; add_u PutDispEnv_env, rtmp_0, rtmp_2 // rarg_0 = rtmp_0 (screen_buffer) + rtmp_2 (.display[active_screen-buffer])
jump_nlink PutDispEnv
load_addr rtmp_1, active_screen_buffer; load_half rtmp_1, 0(rtmp_1);
load_imm rtmp_2, DrawEnv; mult_u rtmp_1, rtmp_2; mov_from_low rtmp_2;
add_ui rtmp_2, rtmp_2, DoubleBuffer_draw
load_addr rtmp_0, screen_buffer; add_u PutDrawEnv_env, rtmp_0, rtmp_2
jump_nlink PutDrawEnv
// Initialize and setup the GTE geometry offsets
jump_nlink InitGeom
load_imm SetGeomOffset_x, ScreenRes_CenterX
load_imm SetGeomOffset_y, ScreenRes_CenterY
jump_nlink SetGeomOffset
load_imm SetGeomScreen_h, ScreenRes_CenterX
jump_nlink SetGeomScreen
load_word rret_addr, 0($sp)
stack_release cf_ssize
jump_reg rret_addr;
.Lgp_screen_init_end: .Lgp_screen_init_end:
.size gp_screen_init, . - gp_screen_init .size gp_screen_init_asm, . - gp_screen_init_asm
.global gp_display_frame
.type gp_display_frame, @function
gp_display_frame:
// TODO(Ed): Time to read docs
.Lgp_display_frame_end:
.size gp_display_frame, . - gp_display_frame