buffers.h

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#ifndef BUFFERS_H
#define BUFFERS_H
 
#include <PR/ultratypes.h>
#include <mk64.h>
#include "common_structs.h"
 
/*
 * This type could reasonably be called decodedTexture or similar
 * These are textures that have been passed through mio0decode
 *
 * According to http://ultra64.ca/files/documentation/online-manuals/man/app/te/us/tmf.html
 * This is technically an array of u32's, but each u32 contains 8/4 pixels depending
 * on pixel depth of the texure (4/8 bits respectively) so representing it as u8's should be fine
 */
typedef struct {
    u8 pixel_index_array[0x1000];
} struct_D_802BFB80_8; // size = 0x1000
 
typedef struct {
    u8 pixel_index_array[0x2000];
} struct_D_802BFB80_4; // size = 0x1000
 
/*
 * In render_player, spawn_players, and staff_ghosts D_802BFB80 is the arraySize8 entry
 * But in code_80091750 its the arraySize4 entry
 * The only way to unify those 2 things is to use a union
*/
typedef union {
    struct_D_802BFB80_4 arraySize4[2][2][4];
    struct_D_802BFB80_8 arraySize8[2][2][8];
} union_D_802BFB80;
 
/*
 * Texture prior to be being decoded via mio0decode
 * Likely over-sized due to encoded textures having variable size
 */
typedef struct {
    char unk_00[0x920];
} struct_D_802DFB80; // size = 0x920
 
typedef struct {
    u16 red:5;
    u16 green:5;
    u16 blue:5;
    u16 alpha:1;
} RGBA5551;
 
/*
 * This type could reasonably be called activeCharacterPalette or similar
 *
 * Appears to be a combination of 2 different palettes:
 *   kart_palette contains the palette for all non-wheel elements of the kart (including the driver).
 *   wheel_palette contains the palette for the wheels.
 * 
 * kart palette sets a defined palette based on the character while
 * wheels palette sets a dynamic palette as you drive around with the kart.
 *
 * The term "palette" appears to be synonymous with "texture lookup table (TLUT)",
 * at least as far as the N64 texture engine is concerned
 * According to http://ultra64.ca/files/documentation/online-manuals/man/app/te/us/tlf.html
 * palettes are technically arrays of u32's, but I feel using a more meaningful data type
 * helps with understanding.
 */
typedef struct {
    /* 0x000 */ RGBA5551  kart_palette[0xC0];
    /* 0x180 */ RGBA5551 wheel_palette[0x40];
} struct_D_802F1F80; // size = 0x200
 
extern u16 gRandomSeed16;
extern u8 randomSeedPadding[216];
extern union_D_802BFB80 D_802BFB80;
extern struct_D_802DFB80 D_802DFB80[][2][8];
 
#ifdef AVOID_UB
extern struct_D_802F1F80 D_802F1F80[2][4][8];
#else
extern u16 D_802F1F80[][4][0x100 * 8];
#endif
extern u16 gZBuffer[SCREEN_WIDTH * SCREEN_HEIGHT];
 
// NOTE: This UB fix from sm64 implemented in mk64,
// in-case it has the same issue.
// untested. Unconfirmed if this applies to mk64.
 
// level_script.c assumes that the frame buffers are adjacent, while game.c's
// -g codegen implies that they are separate variables. This is impossible to
// reconcile without undefined behavior. Avoid that when possible.
#ifdef AVOID_UB
extern u16 gFramebuffers[3][SCREEN_WIDTH * SCREEN_HEIGHT];
#define gFramebuffer0 gFramebuffers[0]
#define gFramebuffer1 gFramebuffers[1]
#define gFramebuffer2 gFramebuffers[2]
#else
extern u16 gFramebuffer0[SCREEN_WIDTH * SCREEN_HEIGHT];
extern u16 gFramebuffer1[SCREEN_WIDTH * SCREEN_HEIGHT];
extern u16 gFramebuffer2[SCREEN_WIDTH * SCREEN_HEIGHT];
#endif
 
#endif // BUFFERS_H