mirror of https://github.com/nmlgc/ReC98.git
[Decompilation] [th05] Shinki: Background type A initialization and rotation
Oh hey, a uth05win naming convention I have no qualms about adopting, for once! (Note from the future: It's actually really smart! The animation you see is dependent on the state from previous background types, so it makes sense to reduce the names to the original sequence.) Part of P0146, funded by -Tom- and Ember2528.
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nmlgc
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@ -6,10 +6,14 @@
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#include "platform.h"
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#include "pc98.h"
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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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#include "th04/math/vector.hpp"
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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/playfld.hpp"
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#include "th05/main/boss/boss.hpp"
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/// Structures
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/// ----------
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@ -45,6 +49,77 @@ extern boss_particle_t boss_particles[BOSS_PARTICLE_COUNT];
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extern lineset_t linesets[LINESET_COUNT];
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/// ----------
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/// Stage 6 - Shinki
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/// ----------------
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static const int SHINKI_LINESET_COUNT = 2;
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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_type_a_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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unsigned int angle;
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int line_i;
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lineset_t near *set;
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if(shinki_bg_type_a_particles_alive == PARTICLES_UNINITIALIZED) {
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set = linesets;
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i = 0;
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angle = 0x40;
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while(i < SHINKI_LINESET_COUNT) {
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for(line_i = 0; line_i < LINESET_LINE_COUNT; line_i++) {
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set->center[line_i].x.v = to_sp(PLAYFIELD_W / 2);
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set->center[line_i].y.v = to_sp(PLAYFIELD_H / 2);
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set->radius[line_i].set(1.0f);
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set->angle[line_i] = angle;
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}
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i++;
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set++;
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angle -= 0x80;
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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 = Subpixel::None();
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particle->patnum = 0;
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i++;
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particle++;
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}
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shinki_bg_type_a_particles_alive = 0;
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}
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if(shinki_bg_type_a_particles_alive < BOSS_PARTICLE_COUNT) {
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if(((boss.phase_frame % 4) == 0) == true) {
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particle = &boss_particles[shinki_bg_type_a_particles_alive];
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particle->pos.set((PLAYFIELD_W / 2), (PLAYFIELD_H / 2));
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particle->origin.set((PLAYFIELD_W / 2), (PLAYFIELD_H / 2));
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particle->angle = randring1_next16();
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particle->age = 0;
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vector2_at(
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particle->velocity,
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0.0f, 0.0f,
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(randring1_next16_and(to_sp(4.0f) - 1) + to_sp(2.0f)),
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particle->angle
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);
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shinki_bg_type_a_particles_alive++;
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}
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}
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if(boss.phase == 3) {
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if((shinki_bg_linesets_zoomed_out % (SHINKI_LINESET_COUNT * 2)) < 2) {
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linesets[0].angle[0] += 0x02;
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linesets[1].angle[0] += 0x02;
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} else {
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linesets[0].angle[0] -= 0x02;
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linesets[1].angle[0] -= 0x02;
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}
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}
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#undef PARTICLES_UNINITIALIZED
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}
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// Draws the given line out of [set] with the current GRCG tile and color.
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void pascal near grcg_lineset_line_put(lineset_t near &set, int i)
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{
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@ -72,3 +147,4 @@ void pascal near lineset_forward_copy(lineset_t near &set)
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set.radius[i].v = set.radius[i - 1].v;
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}
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}
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/// ----------------
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159
th05_main.asm
159
th05_main.asm
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@ -3622,155 +3622,7 @@ loc_D3BA:
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retn
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sub_D327 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_D3C6 proc near
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@@set = word ptr -6
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@@line_i = word ptr -4
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@@angle = 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 word_21D6E, (-1 and 255)
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jnz loc_D456
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mov [bp+@@set], offset _linesets
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xor di, di
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mov [bp+@@angle], 40h
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jmp short loc_D433
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; ---------------------------------------------------------------------------
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loc_D3E4:
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mov [bp+@@line_i], 0
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jmp short loc_D422
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; ---------------------------------------------------------------------------
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loc_D3EB:
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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.x], ((PLAYFIELD_W / 2) shl 4)
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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], ((PLAYFIELD_H / 2) 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 [bx+lineset_t.LS_radius], (1 shl 4)
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mov bx, [bp+@@set]
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add bx, [bp+@@line_i]
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mov al, byte ptr [bp+@@angle]
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mov [bx+lineset_t.LS_angle], al
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inc [bp+@@line_i]
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loc_D422:
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cmp [bp+@@line_i], LINESET_LINE_COUNT
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jl short loc_D3EB
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inc di
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add [bp+@@set], size lineset_t
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sub [bp+@@angle], 80h
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loc_D433:
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cmp di, 2
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jl short loc_D3E4
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mov si, offset _boss_particles
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xor di, di
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jmp short loc_D44B
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; ---------------------------------------------------------------------------
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loc_D43F:
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mov [si+boss_particle_t.BP_pos.x], SUBPIXEL_NONE
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mov [si+boss_particle_t.BP_patnum], 0
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inc di
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add si, size boss_particle_t
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loc_D44B:
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cmp di, BOSS_PARTICLE_COUNT
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jl short loc_D43F
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mov word_21D6E, 0
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loc_D456:
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cmp word_21D6E, BOSS_PARTICLE_COUNT
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jge short loc_D4BE
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mov ax, _boss_phase_frame
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mov bx, 4
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cwd
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idiv bx
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or dx, dx
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jnz short loc_D46F
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mov ax, 1
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jmp short loc_D471
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; ---------------------------------------------------------------------------
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loc_D46F:
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xor ax, ax
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loc_D471:
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cmp ax, 1
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jnz short loc_D4BE
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mov ax, word_21D6E
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shl ax, 4
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add ax, offset _boss_particles
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mov si, ax
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mov [si+boss_particle_t.BP_pos.x], ((PLAYFIELD_W / 2) shl 4)
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mov [si+boss_particle_t.BP_pos.y], ((PLAYFIELD_H / 2) shl 4)
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mov [si+boss_particle_t.BP_origin.x], ((PLAYFIELD_W / 2) shl 4)
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mov [si+boss_particle_t.BP_origin.y], ((PLAYFIELD_H / 2) shl 4)
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call randring1_next16
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mov [si+boss_particle_t.BP_angle], al
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mov [si+boss_particle_t.BP_age], 0
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lea ax, [si+boss_particle_t.BP_velocity]
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push ax
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pushd (0 shl 16) or 0
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call randring1_next16_and pascal, 3Fh
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add ax, (2 shl 4)
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push ax
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mov al, [si+boss_particle_t.BP_angle]
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mov ah, 0
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push ax
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call vector2_at
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inc word_21D6E
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loc_D4BE:
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cmp _boss_phase, 3
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jnz short loc_D4F4
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mov al, byte_21D6C
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mov ah, 0
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mov bx, 4
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cwd
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idiv bx
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cmp dx, 2
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jge short loc_D4E4
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mov al, lineset0.LS_angle
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add al, 2
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mov lineset0.LS_angle, al
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mov al, lineset1.LS_angle
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add al, 2
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jmp short loc_D4F1
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; ---------------------------------------------------------------------------
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loc_D4E4:
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mov al, lineset0.LS_angle
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add al, -2
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mov lineset0.LS_angle, al
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mov al, lineset1.LS_angle
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add al, -2
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loc_D4F1:
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mov lineset1.LS_angle, al
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loc_D4F4:
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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_D3C6 endp
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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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LINESET_FORWARD_COPY procdesc pascal near \
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@ -3788,7 +3640,7 @@ sub_D5E2 proc near
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mov bp, sp
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push si
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push di
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call sub_D3C6
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call _shinki_bg_type_a_update_part1
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mov si, offset _linesets
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xor di, di
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jmp short loc_D630
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@ -3812,7 +3664,7 @@ loc_D5F1:
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call vector2_at
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cmp [si+lineset_t.LS_radius], (224 shl 4)
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jl short loc_D62B
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inc byte_21D6C
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inc _shinki_bg_linesets_zoomed_out
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mov [si+lineset_t.LS_radius], 0
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loc_D62B:
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@ -27386,9 +27238,10 @@ byte_21762 db 0
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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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byte_21D6C db 0
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public _shinki_bg_linesets_zoomed_out, _shinki_bg_type_a_particles_alive
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_shinki_bg_linesets_zoomed_out db 0
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db 0
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word_21D6E dw (-1 and 255)
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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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db 0
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word_21D72 dw 0
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