asmrb.fasm

format ELF64
public main

WIDTH = 1280
HEIGHT = 720
MAX_DEPTH = 5
SAMLPLES = 50

section '.text' executable
extrn fopen
extrn fprintf 
extrn fclose

writeppm:

  lea rsi, [filemode]
  lea rdi, [filename]
  call fopen
  mov qword [ppm], rax

  mov ecx, HEIGHT
  mov edx, WIDTH
  lea esi, [header]
  mov rdi, qword [ppm]
  mov eax, 0
  call fprintf

  mov r8d, 123
  mov ecx, 254
  mov edx, 255
  lea esi, [pixel]
  mov rdi, qword [ppm]
  mov eax, 0
  call fprintf

  mov rdi, qword [ppm]
  call fclose
  ret

main:
  call writeppm

  xor edi, edi
  mov eax, 60
  syscall

section '.data' writeable

struc Vector x, y, z
{
  .x dd 0
  .y dd 0
  .z dd 0
  common
  .size = $ - .x
}

struc Camera eye, lt, rt, lb
{
  .eye Vector 0.0, 4.5, 75.0
  .lt Vector -8.0, 9.0, 50.0
  .rt Vector 8.0, 9.0, 50.0
  .lb Vector -8.0, 0.0, 50.0
  common
  .size = $ - .eye
}

struc Ray origin, direction
{
  .origin Vector
  .direction Vector
}

struc Sphere center, color, radius, is_light
{
  .center Vector
  .color Vector
  .radius dd 0.0
  .is_light dd 0
}

struc Hit dist, point, normal
{
  .dist dd 0.0
  .point Vector
  .normal Vector
}

struc World
{
  spheres_count dd 0
  spheres dd 0
  camera Camera
}

world World

ppm rq 1
filename db 'asmrb.ppm',0
filemode db 'w+',0
header db 'P3',0Ah,'%u %u',0Ah,'255',0Ah,0
pixel db '%u %u %u ',0