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Monorepo for Aesthetic.Computer aesthetic.computer
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3.4 kB · 142 lines
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143# Minimal N64 ROM in pure MIPS assembly# Based on classic N64 homebrew examples
.set noreorder.set noat
.section .boot.global _start
_start: # Set up stack pointer li $sp, 0x80400000 # Initialize video - set up VI registers li $t0, 0xA4400000 # VI base address # VI_CTRL - enable video, 16-bit color li $t1, 0x3002 sw $t1, 0x0($t0) # VI_ORIGIN - framebuffer address (0x80400000 in RDRAM) li $t1, 0x00400000 sw $t1, 0x4($t0) # VI_WIDTH - 320 pixels wide li $t1, 320 sw $t1, 0x8($t0) # VI_V_INTR - vertical interrupt at line 2 li $t1, 2 sw $t1, 0xC($t0) # VI_V_CURRENT - current scanline (read-only, but we can check) # VI_BURST - color burst timing li $t1, 0x03E52239 sw $t1, 0x14($t0) # VI_V_SYNC - vertical sync (525 for NTSC) li $t1, 0x020D sw $t1, 0x18($t0) # VI_H_SYNC - horizontal sync li $t1, 0x00000C15 sw $t1, 0x1C($t0) # VI_H_SYNC_LEAP li $t1, 0x0C150C15 sw $t1, 0x20($t0) # VI_H_VIDEO - horizontal video timing li $t1, 0x006C02EC sw $t1, 0x24($t0) # VI_V_VIDEO - vertical video timing (240 lines) li $t1, 0x002501FF sw $t1, 0x28($t0) # VI_V_BURST li $t1, 0x000E0204 sw $t1, 0x2C($t0) # VI_X_SCALE - horizontal scale (1:1) li $t1, 0x00000200 sw $t1, 0x30($t0) # VI_Y_SCALE - vertical scale (1:1) li $t1, 0x00000400 sw $t1, 0x34($t0)
# Clear framebuffer with a test pattern li $a0, 0x80400000 # Framebuffer start li $a1, 320*240 # Number of pixels (320x240) li $a2, 0xF800 # Red color (16-bit RGB5551) clear_loop: sh $a2, 0($a0) # Store halfword (16-bit pixel) addiu $a0, $a0, 2 # Move to next pixel addiu $a1, $a1, -1 # Decrement counter bnez $a1, clear_loop # Loop if not zero nop # Branch delay slot
# Main loop - draw animated patternmain_loop: li $t0, 0x80400000 # Framebuffer base li $t1, 0 # Y counter y_loop: li $t2, 0 # X counter x_loop: # Calculate color based on position # color = ((x ^ y) & 0x1F) << 11 (red channel) xor $t3, $t2, $t1 # x XOR y andi $t3, $t3, 0x1F # Mask to 5 bits sll $t3, $t3, 11 # Shift to red position ori $t3, $t3, 0x0001 # Set alpha bit # Store pixel sh $t3, 0($t0) addiu $t0, $t0, 2 # Next pixel # Increment X addiu $t2, $t2, 1 li $t4, 320 bne $t2, $t4, x_loop nop # Increment Y addiu $t1, $t1, 1 li $t4, 240 bne $t1, $t4, y_loop nop # Simple delay li $t0, 0x100000delay_loop: addiu $t0, $t0, -1 bnez $t0, delay_loop nop # Loop forever j main_loop nop
.section .rodata.align 4rom_header: # N64 ROM header (simplified) .word 0x80371240 # PI_BSD_DOM1 .word 0x0000000F # Clock rate .word _start # Entry point .word 0x00001444 # Release .word 0x00000000 # CRC1 .word 0x00000000 # CRC2 .space 8 # Reserved .ascii "TEST ROM " # Game title (20 bytes) .space 7 # Reserved .ascii "N" # Media format .ascii " " # Game ID .ascii "E" # Region .byte 0 # Version