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nbg0: fix comment typos

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This commit is contained in:
Zack Buhman 2023-01-27 01:51:20 -08:00
parent 85d42a5042
commit 5e3dc76107
1 changed files with 12 additions and 12 deletions
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24
vdp2/nbg0.cpp
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@ -86,7 +86,7 @@ void main()
| CHCTLA__N0CHSZ__1x1_CELL;
/* "Note: In color RAM modes 0 and 2, 2048-color becomes 1024-color" */
/* use 2-word (16-bit) pattern names */
/* use 1-word (16-bit) pattern names */
vdp2.reg.PNCN0 = PNCN0__N0PNB__1WORD;
/* plane size */
@ -113,6 +113,17 @@ void main()
// zeroize character/cell data from 0 up to plane_a_offset
fill<uint32_t>(&vdp2.vram.u32[(0 / 2)], 0, plane_a_offset);
// "zeroize" plane_a to the 0x40th (64th) character index (an unused/transparent character)
// this creates the '40' indexes in the above picture
fill<uint16_t>(&vdp2.vram.u16[(plane_a_offset / 2)], character_offset * 0x40, plane_size);
constexpr int pixel_width = 64;
constexpr int pixel_height = 64;
constexpr int cell_horizontal = pixel_width / 8;
constexpr int cell_vertical = pixel_height / 8;
constexpr int page_width = 64;
/*
set plane_a character index data to this (hex):
@ -131,17 +142,6 @@ void main()
(the above numbers are not pre-multiplied by character_offset)
*/
// "zeroize" plane_a to the 0x40th (64th) character index (an unused/transparent character)
// this creates the '40' indexes in the above picture
fill<uint16_t>(&vdp2.vram.u16[(plane_a_offset / 2)], character_offset * 0x40, plane_size);
constexpr int pixel_width = 64;
constexpr int pixel_height = 64;
constexpr int cell_horizontal = pixel_width / 8;
constexpr int cell_vertical = pixel_height / 8;
constexpr int page_width = 64;
for (int y = 0; y < cell_vertical; y++) {
for (int x = 0; x < cell_horizontal; x++) {
vdp2.vram.u16[(plane_a_offset / 2) + (y * page_width) + x]