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7538 - baremetal: screen coords in graphemes

This commit is contained in:
Kartik Agaram 2021-01-22 16:44:23 -08:00
parent 7363c6dfd3
commit dbf434f096
4 changed files with 54 additions and 42 deletions
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23
baremetal/103grapheme.subx
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@ -2,9 +2,16 @@
#
# We need to do this in machine code because Mu doesn't have global variables
# yet (for the start of video memory).
#
# There are uncomfortable assumptions baked in here about english/latin
# script. We convert the grid of pixels into a fixed-width grid of graphemes,
# which may not work well with other language families.
== code
# The Mu computer's screen is 1024px wide and 768px tall.
# The Mu computer's font is 8px wide and 16px tall.
# Therefore 'x' here is in [0, 128), and 'y' is in [0, 48)
draw-grapheme-on-real-screen: # g: grapheme, x: int, y: int, color: int, background-color: int
# . prologue
55/push-ebp
@ -22,25 +29,29 @@ draw-grapheme-on-real-screen: # g: grapheme, x: int, y: int, color: int, backgr
# if (letter-bitmap >= 0x9000) return # characters beyond ASCII currently not supported
81 7/subop/compare %esi 0x9000/imm32
7d/jump-if->= $draw-grapheme-on-real-screen:end/disp8
# edx = y
# var ycurr/edx: int = y*16
8b/-> *(ebp+0x10) 2/r32/edx
# var ymax/ebx: int = y + 16
c1 4/subop/shift-left %edx 4/imm8
# var ymax/ebx: int = ycurr + 16
8b/-> *(ebp+0x10) 3/r32/ebx
c1 4/subop/shift-left %ebx 4/imm8
81 0/subop/add %ebx 0x10/imm32
{
# if (y >= ymax) break
# if (ycurr >= ymax) break
39/compare %edx 3/r32/ebx
7d/jump-if->= break/disp8
# eax = x + 7
# var xcurr/eax: int = x*8 + 7
8b/-> *(ebp+0xc) 0/r32/eax # font-width - 1
c1 4/subop/shift-left %eax 3/imm8
81 0/subop/add %eax 7/imm32
# var xmin/ecx: int = x
# var xmin/ecx: int = x*8
8b/-> *(ebp+0xc) 1/r32/ecx
c1 4/subop/shift-left %ecx 3/imm8
# var row-bitmap/ebx: int = *letter-bitmap
53/push-ebx
8b/-> *esi 3/r32/ebx
{
# if (x < xmin) break
# if (xcurr < xmin) break
39/compare %eax 1/r32/ecx
7c/jump-if-< break/disp8
# shift LSB from row-bitmap into carry flag (CF)

3
baremetal/500text-screen.mu
View File

@ -45,13 +45,14 @@ fn initialize-screen screen: (addr screen), width: int, height: int {
copy-to *dest, 0
}
# in graphemes
fn screen-size screen: (addr screen) -> _/eax: int, _/ecx: int {
var width/eax: int <- copy 0
var height/ecx: int <- copy 0
compare screen, 0
{
break-if-!=
return 0x400, 0x300 # 1024x768
return 0x80, 0x30 # 128x48
}
# fake screen
var screen-addr/esi: (addr screen) <- copy screen

68
baremetal/501draw-text.mu
View File

@ -9,7 +9,7 @@ fn cursor-left screen: (addr screen) {
break-if->
return
}
cursor-x <- subtract 8 # font-width
cursor-x <- decrement
set-cursor-position screen, cursor-x, cursor-y
}
@ -26,7 +26,7 @@ fn cursor-right screen: (addr screen) {
break-if-<
return
}
cursor-x <- add 8 # font-width
cursor-x <- increment
set-cursor-position screen, cursor-x, cursor-y
}
@ -39,7 +39,7 @@ fn cursor-up screen: (addr screen) {
break-if->
return
}
cursor-y <- subtract 0x10 # screen-height
cursor-y <- decrement
set-cursor-position screen, cursor-x, cursor-y
}
@ -56,7 +56,7 @@ fn cursor-down screen: (addr screen) {
break-if-<
return
}
cursor-y <- add 0x10 # screen-height
cursor-y <- increment
set-cursor-position screen, cursor-x, cursor-y
}
@ -82,7 +82,7 @@ fn draw-text-rightward screen: (addr screen), text: (addr array byte), x: int, x
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
xcurr <- add 8 # font-width
xcurr <- increment
loop
}
compare xcurr, xmax
@ -98,7 +98,7 @@ fn draw-text-rightward screen: (addr screen), text: (addr array byte), x: int, x
compare g, 0xffffffff # end-of-file
break-if-=
draw-grapheme screen, g, xcurr, y, color
xcurr <- add 8 # font-width
xcurr <- increment
loop
}
set-cursor-position screen, xcurr, y
@ -130,12 +130,12 @@ fn draw-text-wrapping-right-then-down screen: (addr screen), text: (addr array b
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
xcurr <- add 8 # font-width
xcurr <- increment
compare xcurr, xmax
{
break-if-<
xcurr <- copy xmin
ycurr <- add 0x10 # font-height
ycurr <- increment
}
loop
}
@ -153,12 +153,12 @@ fn draw-text-wrapping-right-then-down screen: (addr screen), text: (addr array b
compare g, 0xffffffff # end-of-file
break-if-=
draw-grapheme screen, g, xcurr, ycurr, color
xcurr <- add 8 # font-width
xcurr <- increment
compare xcurr, xmax
{
break-if-<
xcurr <- copy xmin
ycurr <- add 0x10 # font-height
ycurr <- increment
}
loop
}
@ -170,12 +170,12 @@ fn move-cursor-rightward-and-downward screen: (addr screen), xmin: int, xmax: in
var cursor-x/eax: int <- copy 0
var cursor-y/ecx: int <- copy 0
cursor-x, cursor-y <- cursor-position screen
cursor-x <- add 8 # font-width
cursor-x <- increment
compare cursor-x, xmax
{
break-if-<
cursor-x <- copy xmin
cursor-y <- add 0x10 # font-height
cursor-y <- increment
}
set-cursor-position screen, cursor-x, cursor-y
}
@ -193,12 +193,12 @@ fn draw-text-wrapping-right-then-down-from-cursor screen: (addr screen), text: (
var cursor-y/ecx: int <- copy 0
cursor-x, cursor-y <- cursor-position screen
var end-x/edx: int <- copy cursor-x
end-x <- add 8 # font-width
end-x <- increment
compare end-x, xmax
{
break-if-<
cursor-x <- copy xmin
cursor-y <- add 0x10 # font-height
cursor-y <- increment
}
cursor-x, cursor-y <- draw-text-wrapping-right-then-down screen, text, xmin, ymin, xmax, ymax, cursor-x, cursor-y, color
}
@ -223,12 +223,12 @@ fn draw-int32-hex-wrapping-right-then-down screen: (addr screen), n: int, xmin:
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
xcurr <- add 8 # font-width
xcurr <- increment
compare xcurr, xmax
{
break-if-<
xcurr <- copy xmin
ycurr <- add 0x10 # font-height
ycurr <- increment
}
loop
}
@ -246,12 +246,12 @@ fn draw-int32-hex-wrapping-right-then-down screen: (addr screen), n: int, xmin:
compare g, 0xffffffff # end-of-file
break-if-=
draw-grapheme screen, g, xcurr, ycurr, color
xcurr <- add 8 # font-width
xcurr <- increment
compare xcurr, xmax
{
break-if-<
xcurr <- copy xmin
ycurr <- add 0x10 # font-height
ycurr <- increment
}
loop
}
@ -272,12 +272,12 @@ fn draw-int32-hex-wrapping-right-then-down-from-cursor screen: (addr screen), n:
var cursor-y/ecx: int <- copy 0
cursor-x, cursor-y <- cursor-position screen
var end-x/edx: int <- copy cursor-x
end-x <- add 8 # font-width
end-x <- increment
compare end-x, xmax
{
break-if-<
cursor-x <- copy xmin
cursor-y <- add 0x10 # font-height
cursor-y <- increment
}
cursor-x, cursor-y <- draw-int32-hex-wrapping-right-then-down screen, n, xmin, ymin, xmax, ymax, cursor-x, cursor-y, color
}
@ -302,12 +302,12 @@ fn draw-int32-decimal-wrapping-right-then-down screen: (addr screen), n: int, xm
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
xcurr <- add 8 # font-width
xcurr <- increment
compare xcurr, xmax
{
break-if-<
xcurr <- copy xmin
ycurr <- add 0x10 # font-height
ycurr <- increment
}
loop
}
@ -325,12 +325,12 @@ fn draw-int32-decimal-wrapping-right-then-down screen: (addr screen), n: int, xm
compare g, 0xffffffff # end-of-file
break-if-=
draw-grapheme screen, g, xcurr, ycurr, color
xcurr <- add 8 # font-width
xcurr <- increment
compare xcurr, xmax
{
break-if-<
xcurr <- copy xmin
ycurr <- add 0x10 # font-height
ycurr <- increment
}
loop
}
@ -351,12 +351,12 @@ fn draw-int32-decimal-wrapping-right-then-down-from-cursor screen: (addr screen)
var cursor-y/ecx: int <- copy 0
cursor-x, cursor-y <- cursor-position screen
var end-x/edx: int <- copy cursor-x
end-x <- add 8 # font-width
end-x <- increment
compare end-x, xmax
{
break-if-<
cursor-x <- copy xmin
cursor-y <- add 0x10 # font-height
cursor-y <- increment
}
cursor-x, cursor-y <- draw-int32-decimal-wrapping-right-then-down screen, n, xmin, ymin, xmax, ymax, cursor-x, cursor-y, color
}
@ -385,7 +385,7 @@ fn draw-text-downward screen: (addr screen), text: (addr array byte), x: int, y:
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
ycurr <- add 0x10 # font-height
ycurr <- increment
loop
}
compare ycurr, ymax
@ -401,7 +401,7 @@ fn draw-text-downward screen: (addr screen), text: (addr array byte), x: int, y:
compare g, 0xffffffff # end-of-file
break-if-=
draw-grapheme screen, g, x, ycurr, color
ycurr <- add 0x10 # font-height
ycurr <- increment
loop
}
set-cursor-position screen, x, ycurr
@ -432,11 +432,11 @@ fn draw-text-wrapping-down-then-right screen: (addr screen), text: (addr array b
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
ycurr <- add 0x10 # font-height
ycurr <- increment
compare ycurr, ymax
{
break-if-<
xcurr <- add 8 # font-width
xcurr <- increment
ycurr <- copy ymin
}
loop
@ -455,11 +455,11 @@ fn draw-text-wrapping-down-then-right screen: (addr screen), text: (addr array b
compare g, 0xffffffff # end-of-file
break-if-=
draw-grapheme screen, g, xcurr, ycurr, color
ycurr <- add 0x10 # font-height
ycurr <- increment
compare ycurr, ymax
{
break-if-<
xcurr <- add 8 # font-width
xcurr <- increment
ycurr <- copy ymin
}
loop
@ -481,11 +481,11 @@ fn draw-text-wrapping-down-then-right-from-cursor screen: (addr screen), text: (
var cursor-y/ecx: int <- copy 0
cursor-x, cursor-y <- cursor-position screen
var end-y/edx: int <- copy cursor-y
end-y <- add 0x10 # font-height
end-y <- increment
compare end-y, ymax
{
break-if-<
cursor-x <- add 8 # font-width
cursor-x <- increment
cursor-y <- copy ymin
}
cursor-x, cursor-y <- draw-text-wrapping-down-then-right screen, text, xmin, ymin, xmax, ymax, cursor-x, cursor-y, color

2
baremetal/ex4.mu
View File

@ -11,5 +11,5 @@
fn main {
var g/eax: grapheme <- copy 0x41 # 'A'
draw-grapheme 0, g, 0x10, 0x10, 0xa
draw-grapheme 0, g, 2, 1, 0xa # x of 2 graphemes = 16px from top-left; y of 1 grapheme = 16px down from top-left
}