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author | Bad Diode <bd@badd10de.dev> | 2021-06-02 20:57:38 +0200 |
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committer | Bad Diode <bd@badd10de.dev> | 2021-06-02 20:57:38 +0200 |
commit | 6b68cbd8a25dc2e554cf6741ff61ef87c030d841 (patch) | |
tree | 373d242ea1f0ab0e4521ea31cab1c3f281f604a6 /src | |
parent | 215465df74a6065f4b0fdf199b8b04454520a398 (diff) | |
download | stepper-6b68cbd8a25dc2e554cf6741ff61ef87c030d841.tar.gz stepper-6b68cbd8a25dc2e554cf6741ff61ef87c030d841.zip |
Update comments on renderer.c
Diffstat (limited to 'src')
-rw-r--r-- | src/gba/gba.h | 1 | ||||
-rw-r--r-- | src/renderer.c | 18 |
2 files changed, 18 insertions, 1 deletions
diff --git a/src/gba/gba.h b/src/gba/gba.h index 56c4876..a53363a 100644 --- a/src/gba/gba.h +++ b/src/gba/gba.h | |||
@@ -113,7 +113,6 @@ typedef Color Palette[16]; | |||
113 | // | 113 | // |
114 | 114 | ||
115 | // NOTE: Only defining 4bpp tiles for now. | 115 | // NOTE: Only defining 4bpp tiles for now. |
116 | // TODO: typedef u32 Tile[8]; | ||
117 | typedef struct Tile { | 116 | typedef struct Tile { |
118 | u32 row[8]; | 117 | u32 row[8]; |
119 | } Tile; | 118 | } Tile; |
diff --git a/src/renderer.c b/src/renderer.c index ec54411..bddaacd 100644 --- a/src/renderer.c +++ b/src/renderer.c | |||
@@ -1,3 +1,20 @@ | |||
1 | // | ||
2 | // This Mode 0 renderer provides a way of drawing directly to a framebuffer | ||
3 | // (similar to Mode 3 and 4) while retaining the flexibility of using other | ||
4 | // backgrounds if needed. It also performs double buffering to avoid tearing | ||
5 | // artifacts and tries to only draw tiles that changed on each frame. | ||
6 | // | ||
7 | // In addition to the frontbuffer (displayed on background 0), a tiled text | ||
8 | // layer is displayed on background 1, which can be used for application | ||
9 | // development or for debug information. | ||
10 | // | ||
11 | // These two layers occupy the first and second background charblocks, leaving | ||
12 | // the remaining two available for other background layers. There are 14KB of | ||
13 | // sprite memory available, since the backbuffer is located at the end of the | ||
14 | // VRAM, but if more space is needed it can be moved to the end of the BG | ||
15 | // charblocks instead. | ||
16 | // | ||
17 | |||
1 | #include "bd-font.c" | 18 | #include "bd-font.c" |
2 | 19 | ||
3 | // The frontbuffer is located at the beginning of the VRAM, and requires 20KB of | 20 | // The frontbuffer is located at the beginning of the VRAM, and requires 20KB of |
@@ -24,6 +41,7 @@ | |||
24 | #define FONT_TILEMAP ((u16*)(MEM_VRAM + KB(30))) | 41 | #define FONT_TILEMAP ((u16*)(MEM_VRAM + KB(30))) |
25 | #define FONT_SB 15 | 42 | #define FONT_SB 15 |
26 | 43 | ||
44 | // Keep track of which tiles need to be copied to the frontbuffer. | ||
27 | static u32 dirty_tiles[21] = {0}; | 45 | static u32 dirty_tiles[21] = {0}; |
28 | 46 | ||
29 | // TODO: Allow disable bound checking at compile time. | 47 | // TODO: Allow disable bound checking at compile time. |