Macro-ify access to pauseCtx->playerSegment regions (#2693)

* Macro-ify access to pauseCtx->playerSegment regions.

Using macros to indicate which region in the player segment is being
accessed makes the memory layout more obvious and indicates the
intended level of memory ownership, particularly in the case of the
texture image at the start of the segment.

* Add clarifications for gameplay_keep details

* Uniform macro name for the render texture

* Comment

1 files changed, 15 insertions, 14 deletions

diff --git a/src/code/z_player_lib.c b/src/code/z_player_lib.c
index 49948f856..c701f379d 100644
--- a/src/code/z_player_lib.c
+++ b/src/code/z_player_lib.c
@@ -1890,25 +1890,27 @@ u32 Player_InitPauseDrawData(PlayState* play, u8* segment, SkelAnime* skelAnime)
     u32 size;
     void* ptr;
 
+    // Note that since gameplay_keep is typically a compressed segment and due to constraints in the DMA manager,
+    // the entire segment is loaded even when only the first bytes up to PAUSE_PLAYER_SEGMENT_GAMEPLAY_KEEP_BUFFER_SIZE
+    // are kept for later use.
     size = gObjectTable[OBJECT_GAMEPLAY_KEEP].vromEnd - gObjectTable[OBJECT_GAMEPLAY_KEEP].vromStart;
-    ptr = segment + PAUSE_EQUIP_BUFFER_SIZE;
+    ptr = PAUSE_PLAYER_SEGMENT_GAMEPLAY_KEEP_START(segment);
     DMA_REQUEST_SYNC(ptr, gObjectTable[OBJECT_GAMEPLAY_KEEP].vromStart, size, "../z_player_lib.c", 2982);
 
     size = gObjectTable[linkObjectId].vromEnd - gObjectTable[linkObjectId].vromStart;
-    ptr = segment + PAUSE_EQUIP_BUFFER_SIZE + PAUSE_PLAYER_SEGMENT_GAMEPLAY_KEEP_BUFFER_SIZE;
+    ptr = PAUSE_PLAYER_SEGMENT_LINK_OBJECT(segment);
     DMA_REQUEST_SYNC(ptr, gObjectTable[linkObjectId].vromStart, size, "../z_player_lib.c", 2988);
 
+    // Joint tables are placed after the link object
     ptr = (void*)ALIGN16((uintptr_t)ptr + size);
 
-    gSegments[4] = OS_K0_TO_PHYSICAL(segment + PAUSE_EQUIP_BUFFER_SIZE);
-    gSegments[6] =
-        OS_K0_TO_PHYSICAL(segment + PAUSE_EQUIP_BUFFER_SIZE + PAUSE_PLAYER_SEGMENT_GAMEPLAY_KEEP_BUFFER_SIZE);
+    gSegments[4] = OS_K0_TO_PHYSICAL(PAUSE_PLAYER_SEGMENT_GAMEPLAY_KEEP_START(segment));
+    gSegments[6] = OS_K0_TO_PHYSICAL(PAUSE_PLAYER_SEGMENT_LINK_OBJECT(segment));
 
     SkelAnime_InitLink(play, skelAnime, gPlayerSkelHeaders[(void)0, gSaveContext.save.linkAge],
                        &gPlayerAnim_link_normal_wait, 9, ptr, ptr, PLAYER_LIMB_MAX);
 
-    return PAUSE_EQUIP_BUFFER_SIZE + PAUSE_PLAYER_SEGMENT_GAMEPLAY_KEEP_BUFFER_SIZE + size +
-           sizeof(Vec3s[PLAYER_LIMB_BUF_COUNT]);
+    return PAUSE_PLAYER_SEGMENT_TOTAL_SIZE(size);
 }
 
 u8 sPauseModelGroupBySword[] = {
@@ -2078,9 +2080,8 @@ void Player_DrawPause(PlayState* play, u8* segment, SkelAnime* skelAnime, Vec3f*
     Vec3s* srcTable;
     s32 i;
 
-    gSegments[4] = OS_K0_TO_PHYSICAL(segment + PAUSE_EQUIP_BUFFER_SIZE);
-    gSegments[6] =
-        OS_K0_TO_PHYSICAL(segment + PAUSE_EQUIP_BUFFER_SIZE + PAUSE_PLAYER_SEGMENT_GAMEPLAY_KEEP_BUFFER_SIZE);
+    gSegments[4] = OS_K0_TO_PHYSICAL(PAUSE_PLAYER_SEGMENT_GAMEPLAY_KEEP_START(segment));
+    gSegments[6] = OS_K0_TO_PHYSICAL(PAUSE_PLAYER_SEGMENT_LINK_OBJECT(segment));
 
     if (!LINK_IS_ADULT) {
         if (shield == PLAYER_SHIELD_DEKU) {
@@ -2104,9 +2105,9 @@ void Player_DrawPause(PlayState* play, u8* segment, SkelAnime* skelAnime, Vec3f*
         *destTable++ = *srcTable++;
     }
 
-    Player_DrawPauseImpl(play, segment + PAUSE_EQUIP_BUFFER_SIZE,
-                         segment + PAUSE_EQUIP_BUFFER_SIZE + PAUSE_PLAYER_SEGMENT_GAMEPLAY_KEEP_BUFFER_SIZE, skelAnime,
-                         pos, rot, scale, sword, tunic, shield, boots, PAUSE_EQUIP_PLAYER_WIDTH,
-                         PAUSE_EQUIP_PLAYER_HEIGHT, &eye, &at, 60.0f, play->state.gfxCtx->curFrameBuffer,
+    Player_DrawPauseImpl(play, PAUSE_PLAYER_SEGMENT_GAMEPLAY_KEEP_START(segment),
+                         PAUSE_PLAYER_SEGMENT_LINK_OBJECT(segment), skelAnime, pos, rot, scale, sword, tunic, shield,
+                         boots, PAUSE_EQUIP_PLAYER_WIDTH, PAUSE_EQUIP_PLAYER_HEIGHT, &eye, &at, 60.0f,
+                         play->state.gfxCtx->curFrameBuffer,
                          play->state.gfxCtx->curFrameBuffer + (PAUSE_EQUIP_PLAYER_WIDTH * PAUSE_EQUIP_PLAYER_HEIGHT));
 }