mirror of https://github.com/nmlgc/ReC98.git
[Decompilation] [th05] Shinki: Background type B initialization and gravity
We're really going to have a needless "update, part 1" function for all four background types, eh? Part of P0146, funded by -Tom- and Ember2528.
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nmlgc
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@ -15,6 +15,7 @@
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#include "th04/math/motion.hpp"
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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/frames.h"
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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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@ -68,6 +69,7 @@ static const int SHINKI_LINE_4 = (3 * 6);
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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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extern bool shinki_bg_type_b_initialized;
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void near shinki_bg_particles_render(void)
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{
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@ -265,4 +267,58 @@ void near shinki_bg_type_a_update_and_render(void)
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}
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shinki_bg_render_blue_particles_and_lines();
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}
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void near shinki_bg_type_b_update_part1(void)
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{
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boss_particle_t near *particle;
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int i;
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subpixel_t center_x;
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int line_i;
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lineset_t near *set;
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if(!shinki_bg_type_b_initialized) {
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center_x = to_sp(playfield_fraction_x(1 / 6.0f));
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set = linesets;
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i = 0;
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while(i < SHINKI_LINESET_COUNT) {
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for(line_i = SHINKI_LINE_4; line_i >= 0; line_i--) {
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set->center[line_i].x.v = center_x;
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set->center[line_i].y.v = to_sp((PLAYFIELD_H / 2) + 32);
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set->radius[line_i].set(256.0f);
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set->angle[line_i] = 0x40;
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}
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set->velocity_y.set(0.0f);
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i++;
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set++;
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center_x += to_sp(playfield_fraction_x(4 / 6.0f));
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}
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particle = boss_particles;
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i = 0;
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while(i < BOSS_PARTICLE_COUNT) {
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particle->pos.x.v = randring1_next16_mod(to_sp(PLAYFIELD_W));
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// Huh? Not PLAYFIELD_H?
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particle->pos.y.v = randring1_next16_mod(to_sp(PLAYFIELD_W));
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particle->origin.x = particle->pos.x;
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particle->origin.y.set(-1.0f);
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particle->velocity.set(0.0f, 0.0f);
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particle->patnum = (
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PAT_PARTICLE + randring1_next16_and(PARTICLE_CELS - 1)
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);
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i++;
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particle++;
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}
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shinki_bg_type_b_initialized++;
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return;
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}
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particle = boss_particles;
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i = 0;
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while(i < BOSS_PARTICLE_COUNT) {
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if(particle->velocity.y < to_sp(10.0f)) {
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particle->velocity.y.v += stage_frame_mod2;
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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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/// ----------------
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120
th05_main.asm
120
th05_main.asm
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@ -3538,124 +3538,11 @@ yumeko_bg_render endp
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LINESET_FORWARD_COPY procdesc pascal near \
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set:near ptr
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_shinki_bg_type_a_update_and_rend procdesc c near
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_shinki_bg_type_b_update_part1 procdesc c near
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main__TEXT ends
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main_0_TEXT segment word public 'CODE' use16
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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_D694 proc near
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@@set = word ptr -6
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@@line_i = word ptr -4
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@@center_x = word ptr -2
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enter 6, 0
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push si
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push di
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cmp byte_21D70, 0
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jnz loc_D751
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mov [bp+@@center_x], (64 shl 4)
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mov [bp+@@set], offset _linesets
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xor di, di
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jmp short loc_D707
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; ---------------------------------------------------------------------------
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loc_D6B1:
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mov [bp+@@line_i], (LINESET_LINE_COUNT - 2)
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jmp short loc_D6EE
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; ---------------------------------------------------------------------------
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loc_D6B8:
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mov bx, [bp+@@line_i]
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shl bx, 2
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add bx, [bp+@@set]
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mov ax, [bp+@@center_x]
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mov [bx+lineset_t.LS_center.x], ax
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mov bx, [bp+@@line_i]
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shl bx, 2
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add bx, [bp+@@set]
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mov [bx+lineset_t.LS_center.y], (216 shl 4)
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mov bx, [bp+@@line_i]
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add bx, bx
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add bx, [bp+@@set]
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mov word ptr [bx+lineset_t.LS_radius], (256 shl 4)
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mov bx, [bp+@@set]
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add bx, [bp+@@line_i]
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mov byte ptr [bx+lineset_t.LS_angle], 40h
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dec [bp+@@line_i]
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loc_D6EE:
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cmp [bp+@@line_i], 0
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jge short loc_D6B8
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mov bx, [bp+@@set]
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mov word ptr [bx+lineset_t.LS_velocity_y], 0
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inc di
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add [bp+@@set], size lineset_t
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add [bp+@@center_x], (256 shl 4)
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loc_D707:
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cmp di, 2
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jl short loc_D6B1
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mov si, offset _boss_particles
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xor di, di
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jmp short loc_D746
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; ---------------------------------------------------------------------------
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loc_D713:
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call randring1_next16_mod pascal, (PLAYFIELD_W shl 4)
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mov [si+boss_particle_t.BP_pos.x], ax
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call randring1_next16_mod pascal, (PLAYFIELD_W shl 4) ; Huh?
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mov [si+boss_particle_t.BP_pos.y], ax
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mov ax, [si+boss_particle_t.BP_pos.x]
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mov [si+boss_particle_t.BP_origin.x], ax
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mov [si+boss_particle_t.BP_origin.y], (-1 shl 4)
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mov [si+boss_particle_t.BP_velocity.x], 0
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mov [si+boss_particle_t.BP_velocity.y], 0
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call randring1_next16_and pascal, 3
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add al, PAT_PARTICLE
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mov [si+boss_particle_t.BP_patnum], al
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inc di
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add si, size boss_particle_t
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loc_D746:
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cmp di, BOSS_PARTICLE_COUNT
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jl short loc_D713
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inc byte_21D70
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jmp short loc_D770
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; ---------------------------------------------------------------------------
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loc_D751:
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mov si, offset _boss_particles
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xor di, di
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jmp short loc_D76B
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; ---------------------------------------------------------------------------
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loc_D758:
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cmp [si+boss_particle_t.BP_velocity.y], (10 shl 4)
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jge short loc_D767
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mov al, _stage_frame_mod2
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mov ah, 0
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add [si+boss_particle_t.BP_velocity.y], ax
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loc_D767:
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inc di
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add si, size boss_particle_t
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loc_D76B:
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cmp di, BOSS_PARTICLE_COUNT
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jl short loc_D758
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loc_D770:
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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_D694 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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@ -3668,7 +3555,7 @@ var_2 = 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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call sub_D694
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call _shinki_bg_type_b_update_part1
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mov [bp+var_2], 4
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mov si, offset _linesets
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xor di, di
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@ -27083,10 +26970,11 @@ byte_21762 db 0
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include th04/sprites/pointnum.asp
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include th05/formats/bb_playchar[data].asm
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public _shinki_bg_linesets_zoomed_out, _shinki_bg_type_a_particles_alive
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public _shinki_bg_type_b_initialized
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_shinki_bg_linesets_zoomed_out db 0
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db 0
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_shinki_bg_type_a_particles_alive dw (-1 and 255)
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byte_21D70 db 0
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_shinki_bg_type_b_initialized db 0
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db 0
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word_21D72 dw 0
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byte_21D74 db 0
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