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Overhaul "Pixel FIFO" article into "Rendering Internals" #379

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11 changes: 9 additions & 2 deletions custom/style.css
Original file line number Diff line number Diff line change
Expand Up @@ -24,9 +24,9 @@ html {

body {
font-family: "Inter";
/* Enable some font features for Inter (https://rsms.me/inter/#features/calt) */
/* Enable some font features for Inter (https://rsms.me/inter/#features) */
font-feature-settings: "ss01", /* Alternate (Open) digits */ "ss02",
/* Disambiguation gliphs */ "case";
/* Disambiguation glyphs */ "case", /* No contextual alternatives (e.g. 3x9 → 3×9) */ "calt" 0;
/* Case alternates */
letter-spacing: -0.005em;
/* equals -0.5% */
Expand Down Expand Up @@ -112,6 +112,13 @@ code {
margin: 25px 0px 25px 0px;
}

/* Classes for custom table styling */

table.compact th {
padding: 3px 5px;
}


/* Global CSS variables */

:root {
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2 changes: 1 addition & 1 deletion src/Power_Up_Sequence.md
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Expand Up @@ -106,7 +106,7 @@ It is speculated that this may be debug remnants.

The boot ROM is responsible for the automatic colorization of monochrome-only games when run on a GBC.

When in DMG compatibility mode, the [CGB palettes](<#LCD Color Palettes (CGB only)>) are still being used: the background uses BG palette 0 (likely because the entire [attribute map](<#BG Map Attributes (CGB Mode only)>) is set to all zeros), and objects use OBJ palette 0 or 1 depending on bit 4 of [their attribute](<#Byte 3 — Attributes/Flags>).
When in DMG compatibility mode, the [CGB palettes](<#LCD Color Palettes (CGB only)>) are still being used: the background uses BG palette 0 (likely because the entire [attribute map](<#BG Map attributes (CGB Mode only)>) is set to all zeros), and objects use OBJ palette 0 or 1 depending on bit 4 of [their attribute](<#Byte 3 — Attributes/Flags>).
[`BGP`, `OBP0`, and `OBP1`](<#LCD Monochrome Palettes>) actually index into the CGB palettes instead of the DMG's shades of grey.

The boot ROM picks a compatibility palette using an ID computed using the following algorithm:
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408 changes: 408 additions & 0 deletions src/Rendering_Internals.md

Large diffs are not rendered by default.

2 changes: 1 addition & 1 deletion src/STAT.md
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Expand Up @@ -2,7 +2,7 @@

:::tip TERMINOLOGY

A *dot* is the shortest period over which the PPU can output one pixel: is it equivalent to 1 T-cycle on DMG or on CGB Single Speed mode or 2 T-cycles on CGB Double Speed mode. On each dot during mode 3, either the PPU outputs a pixel or the fetcher is stalling the [FIFOs](<#Pixel FIFO>).
A *dot* is the shortest period over which the PPU can output one pixel: is it equivalent to 1 T-cycle on DMG or on CGB Single Speed mode or 2 T-cycles on CGB Double Speed mode. On each dot during mode 3, either the PPU outputs a pixel or the fetcher is stalling the [FIFOs](<#Rendering Internals>).

:::

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2 changes: 1 addition & 1 deletion src/SUMMARY.md
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Expand Up @@ -23,7 +23,7 @@
- [Scrolling](./Scrolling.md)
- [Palettes](./Palettes.md)
- [Rendering](./Rendering.md)
- [Pixel FIFO](./pixel_fifo.md)
- [Rendering internals](./Rendering_Internals.md)
- [Audio](./Audio.md)
- [Audio Registers](./Audio_Registers.md)
- [Audio Details](./Audio_details.md)
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2 changes: 1 addition & 1 deletion src/Scrolling.md
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Expand Up @@ -46,7 +46,7 @@ scanline.

### Scrolling

The scroll registers are re-read on each [tile fetch](<#Get Tile>), except for the low 3 bits of SCX, which are only read at the beginning of the scanline (for the initial shifting of pixels).
The scroll registers are re-read on each [tile fetch](<#Get tile ID>), except for the low 3 bits of SCX, which are only read at the beginning of the scanline (for the initial shifting of pixels).

All models before the CGB-D read the Y coordinate once for each bitplane (so a very precisely timed SCY write allows "desyncing" them), but CGB-D and later use the same Y coordinate for both no matter what.

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7 changes: 3 additions & 4 deletions src/Tile_Maps.md
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Expand Up @@ -5,10 +5,9 @@ The Game Boy contains two 32×32 tile maps in VRAM at
the memory areas `$9800-$9BFF` and `$9C00-$9FFF`. Any of these maps can be used to
display the Background or the Window.

## Tile Indexes
## Tile indices

Each tile map contains the 1-byte indexes of the
tiles to be displayed.
Each tile map contains the 1-byte indices of the tiles to be displayed.

Tiles are obtained from the Tile Data Table using either of the two
addressing modes (described in [VRAM Tile Data](<#VRAM Tile Data>)), which
Expand All @@ -17,7 +16,7 @@ can be selected via [the LCDC register](<#FF40 — LCDC: LCD control>).
Since one tile has 8×8 pixels, each map holds a 256×256 pixels picture.
Only 160×144 of those pixels are displayed on the LCD at any given time.

## BG Map Attributes (CGB Mode only)
## BG Map attributes (CGB Mode only)

In CGB Mode, an additional map of 32×32 bytes is stored in VRAM Bank 1
(each byte defines attributes for the corresponding tile-number map
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181 changes: 181 additions & 0 deletions src/imgs/src/ppu_overview.svg
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