mirror of https://github.com/nmlgc/ReC98.git
[Decompilation] [th05] Shinki: Background particle rendering
We really wouldn't have wanted to start writing inline ASM in the middle of a conditional expression just to get that janky `CMP AX, 0` instead of TCC's sensible `OR AX, AX` optimization. Part of P0146, funded by -Tom- and Ember2528.
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nmlgc
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4672f226bb
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@ -6,4 +6,4 @@
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_AX = top; \
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_CX = left; \
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z_super_roll_put_16x16_mono_raw(patnum);
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void z_pascal near z_super_roll_put_16x16_mono_raw(int patnum);
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void pascal near z_super_roll_put_16x16_mono_raw(int patnum);
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@ -5,6 +5,7 @@
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#include "platform.h"
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#include "pc98.h"
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#include "decomp.hpp"
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#include "master.hpp"
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#include "th01/math/area.hpp"
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#include "th01/math/subpixel.hpp"
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@ -13,6 +14,8 @@
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#include "th04/math/randring.h"
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#include "th04/main/drawp.hpp"
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#include "th04/main/playfld.hpp"
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#include "th05/sprites/main_pat.h"
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#include "th05/formats/super.h"
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#include "th05/main/boss/boss.hpp"
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/// Structures
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@ -58,6 +61,60 @@ static const int PARTICLES_UNINITIALIZED = (-1 & 0xFF);
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extern unsigned char shinki_bg_linesets_zoomed_out;
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extern int shinki_bg_type_a_particles_alive;
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void near shinki_bg_particles_render(void)
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{
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_ES = SEG_PLANE_B;
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boss_particle_t near *particle = boss_particles;
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int patnum;
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screen_x_t left_;
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int i = 0;
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while(i < BOSS_PARTICLE_COUNT) {
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if(particle->pos.x.v != Subpixel::None()) {
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particle->pos.x.v += particle->velocity.x.v;
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particle->pos.y.v += particle->velocity.y.v;
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if(particle->patnum == 0) {
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patnum = (particle->age / 8);
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if(patnum >= PARTICLE_CELS) {
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patnum = (PARTICLE_CELS - 1);
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}
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patnum += PAT_PARTICLE;
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} else {
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patnum = particle->patnum;
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}
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#define left static_cast<pixel_t>(_CX)
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#define top static_cast<pixel_t>(_AX)
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// Lol, is this only not directly assigned to _CX because ZUN was
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// scared that the _AX assignment might overwrite _CX?
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left_ = (
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particle->pos.x.to_pixel() + PLAYFIELD_LEFT - (PARTICLE_W / 2)
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);
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top = (
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particle->pos.y.to_pixel() + PLAYFIELD_TOP - (PARTICLE_H / 2)
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);
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left = left_;
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if(!(
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(left > (PLAYFIELD_LEFT - PARTICLE_W)) &&
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(left < PLAYFIELD_RIGHT) &&
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(top > keep_0(PLAYFIELD_TOP - PARTICLE_H)) &&
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(top < PLAYFIELD_BOTTOM)
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)) {
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particle->pos = particle->origin;
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particle->age = 0;
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} else {
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z_super_roll_put_16x16_mono(left, top, patnum);
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particle->age++;
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}
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#undef top
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#undef left
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}
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i++;
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particle++;
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}
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}
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void near shinki_bg_type_a_update_part1(void)
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{
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boss_particle_t near *particle;
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@ -3532,96 +3532,7 @@ loc_D322:
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retn
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yumeko_bg_render endp
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; =============== S U B R O U T I N E =======================================
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; Attributes: bp-based frame
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sub_D327 proc near
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@@i = word ptr -4
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@@left = word ptr -2
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enter 4, 0
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push si
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push di
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mov ax, GRAM_400
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mov es, ax
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mov si, offset _boss_particles
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mov [bp+@@i], 0
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jmp short loc_D3BA
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; ---------------------------------------------------------------------------
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loc_D33C:
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cmp [si+boss_particle_t.BP_pos.x], SUBPIXEL_NONE
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jz short loc_D3B4
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mov ax, [si+boss_particle_t.BP_velocity.x]
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add [si+boss_particle_t.BP_pos.x], ax
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mov ax, [si+boss_particle_t.BP_velocity.y]
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add [si+boss_particle_t.BP_pos.y], ax
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cmp [si+boss_particle_t.BP_patnum], 0
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jnz short loc_D36C
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mov ax, [si+boss_particle_t.BP_age]
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mov bx, 8
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cwd
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idiv bx
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mov di, ax
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cmp di, PARTICLE_CELS
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jl short loc_D366
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mov di, (PARTICLE_CELS - 1)
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loc_D366:
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add di, PAT_PARTICLE
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jmp short loc_D373
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; ---------------------------------------------------------------------------
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loc_D36C:
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mov al, [si+boss_particle_t.BP_patnum]
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mov ah, 0
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mov di, ax
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loc_D373:
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mov ax, [si+boss_particle_t.BP_pos.x]
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sar ax, 4
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add ax, (PLAYFIELD_LEFT - (PARTICLE_W / 2))
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mov [bp+@@left], ax
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mov ax, [si+boss_particle_t.BP_pos.y]
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sar ax, 4
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add ax, (PLAYFIELD_TOP - (PARTICLE_H / 2))
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mov cx, [bp+@@left]
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cmp cx, (PLAYFIELD_LEFT - PARTICLE_W)
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jle short loc_D39F
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cmp cx, PLAYFIELD_RIGHT
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jge short loc_D39F
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cmp ax, (PLAYFIELD_TOP - PARTICLE_H)
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jle short loc_D39F
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cmp ax, PLAYFIELD_BOTTOM
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jl short loc_D3AD
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loc_D39F:
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mov eax, dword ptr [si+boss_particle_t.BP_origin]
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mov dword ptr [si+boss_particle_t.BP_pos], eax
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mov [si+boss_particle_t.BP_age], 0
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jmp short loc_D3B4
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; ---------------------------------------------------------------------------
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loc_D3AD:
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call z_super_roll_put_16x16_mono_raw pascal, di
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inc [si+boss_particle_t.BP_age]
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loc_D3B4:
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inc [bp+@@i]
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add si, size boss_particle_t
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loc_D3BA:
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cmp [bp+@@i], BOSS_PARTICLE_COUNT
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jl loc_D33C
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pop di
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pop si
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leave
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retn
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sub_D327 endp
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_shinki_bg_particles_render procdesc c near
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_shinki_bg_type_a_update_part1 procdesc c near
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GRCG_LINESET_LINE_PUT procdesc pascal near \
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set:near ptr, i:word
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@ -3677,7 +3588,7 @@ loc_D630:
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call _grcg_setmode_rmw_seg1
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mov ah, GC_BRG
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call _grcg_setcolor_direct_seg1_raw
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call sub_D327
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call _shinki_bg_particles_render
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call grcg_lineset_line_put pascal, offset lineset0, 18
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call grcg_lineset_line_put pascal, offset lineset0, 12
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call grcg_lineset_line_put pascal, offset lineset1, 18
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@ -3921,7 +3832,7 @@ loc_D82E:
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call _grcg_setmode_rmw_seg1
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mov ah, GC_BRG
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call _grcg_setcolor_direct_seg1_raw
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call sub_D327
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call _shinki_bg_particles_render
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call grcg_lineset_line_put pascal, offset lineset0, 18
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call grcg_lineset_line_put pascal, offset lineset0, 12
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call grcg_lineset_line_put pascal, offset lineset1, 18
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@ -4130,7 +4041,7 @@ loc_D9C6:
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call _grcg_setmode_rmw_seg1
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mov ah, GC_BRG
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call _grcg_setcolor_direct_seg1_raw
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call sub_D327
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call _shinki_bg_particles_render
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call grcg_lineset_line_put pascal, offset lineset0, 18
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call grcg_lineset_line_put pascal, offset lineset0, 12
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call grcg_lineset_line_put pascal, offset lineset1, 18
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@ -4291,7 +4202,7 @@ loc_DB0A:
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call sub_E950
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call sub_DA25
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call grcg_setcolor pascal, (GC_RMW shl 16) + 6
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call sub_D327
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call _shinki_bg_particles_render
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GRCG_OFF_CLOBBERING dx
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leave
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retn
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