diff options
| author | Kartik K. Agaram <vc@akkartik.com> | 2021-06-12 22:22:54 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2021-06-12 22:22:54 -0700 |
| commit | 0511b9fd1170da575170bcde2fa617969cbf6a53 (patch) | |
| tree | 7296726032ea4bfdcac6bac7e0e139061ee36016 /101screen.subx | |
| parent | bda6982ba14e1e5c562d86260ad906d9fb29261b (diff) | |
| download | mu-0511b9fd1170da575170bcde2fa617969cbf6a53.tar.gz | |
helper to render fonts outside video RAM, take 2
Diffstat (limited to '101screen.subx')
| -rw-r--r-- | 101screen.subx | 43 |
1 files changed, 28 insertions, 15 deletions
diff --git a/101screen.subx b/101screen.subx index 2aab293d..b957d5d2 100644 --- a/101screen.subx +++ b/101screen.subx @@ -9,30 +9,43 @@ pixel-on-real-screen: # x: int, y: int, color: int # . prologue 55/push-ebp 89/<- %ebp 4/r32/esp + # + (pixel-on-screen-buffer *Video-memory-addr *(ebp+8) *(ebp+0xc) *(ebp+0x10) 0x400 0x300) +$pixel-on-real-screen:end: + # . epilogue + 89/<- %esp 5/r32/ebp + 5d/pop-to-ebp + c3/return + +# 'buffer' here is not a valid Mu type: a naked address without a length. +pixel-on-screen-buffer: # buffer: (addr byte), x: int, y: int, color: int, width: int, height: int + # . prologue + 55/push-ebp + 89/<- %ebp 4/r32/esp # . save registers 50/push-eax 51/push-ecx # bounds checks - 8b/-> *(ebp+8) 0/r32/eax + 8b/-> *(ebp+0xc) 0/r32/eax # foo 3d/compare-eax-and 0/imm32 - 7c/jump-if-< $pixel-on-real-screen:end/disp8 - 3d/compare-eax-and 0x400/imm32/screen-width=1024 - 7d/jump-if->= $pixel-on-real-screen:end/disp8 - 8b/-> *(ebp+0xc) 0/r32/eax + 7c/jump-if-< $pixel-on-screen-buffer:end/disp8 + 3b/compare 0/r32/eax *(ebp+0x18) + 7d/jump-if->= $pixel-on-screen-buffer:end/disp8 + 8b/-> *(ebp+0x10) 0/r32/eax 3d/compare-eax-and 0/imm32 - 7c/jump-if-< $pixel-on-real-screen:end/disp8 - 3d/compare-eax-and 0x300/imm32/screen-height=768 - 7d/jump-if->= $pixel-on-real-screen:end/disp8 - # eax = y*1024 + x - 8b/-> *(ebp+0xc) 0/r32/eax - c1/shift 4/subop/left %eax 0xa/imm8 - 03/add-> *(ebp+8) 0/r32/eax + 7c/jump-if-< $pixel-on-screen-buffer:end/disp8 + 3b/compare 0/r32/eax *(ebp+0x1c) + 7d/jump-if->= $pixel-on-screen-buffer:end/disp8 + # eax = y*width + x + 8b/-> *(ebp+0x10) 0/r32/eax + 0f af/multiply-> *(ebp+0x18) 0/r32/eax + 03/add-> *(ebp+0xc) 0/r32/eax # eax += location of frame buffer - 03/add-> *Video-memory-addr 0/r32/eax + 03/add-> *(ebp+8) 0/r32/eax # *eax = color - 8b/-> *(ebp+0x10) 1/r32/ecx + 8b/-> *(ebp+0x14) 1/r32/ecx 88/byte<- *eax 1/r32/CL -$pixel-on-real-screen:end: +$pixel-on-screen-buffer:end: # . restore registers 59/pop-to-ecx 58/pop-to-eax |