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[gbajam21] / src / gamescr.c

diff --git a/src/gamescr.c b/src/gamescr.c
index 70991e8..39ed733 100644 (file)
--- a/src/gamescr.c
+++ b/src/gamescr.c
@@ -1,17 +1,28 @@
 #include <stdlib.h>
 #include <string.h>
 #include "gbaregs.h"
+#include "game.h"
 #include "dma.h"
 #include "data.h"
 #include "util.h"
 #include "intr.h"
+#include "input.h"
+#include "sprite.h"
 #include "debug.h"
 
 static void draw_tunnel(void);
+static void vblank(void);
 
 static int nframes, backbuf;
 static uint16_t *vram[] = { (uint16_t*)VRAM_LFB_FB0_ADDR, (uint16_t*)VRAM_LFB_FB1_ADDR };
 static unsigned char *tex;
+static uint16_t bnstate;
+
+#define MAX_SPR                4
+static uint16_t oam[4 * MAX_SPR];
+
+static short x = 120, y = 80;
+static unsigned char rot;
 
 void gamescr(void)
 {
@@ -19,10 +30,20 @@ void gamescr(void)
        uint16_t *cdst;
        unsigned char *csrc;
 
-       REG_DISPCNT = 4 | DISPCNT_BG2 | DISPCNT_FB1;
+       REG_DISPCNT = 4 | DISPCNT_BG2 | DISPCNT_OBJ | DISPCNT_FB1;
 
        vblperf_setcolor(0xff);
 
+       /* sprite setup */
+       spr_setup(16, 16, spr_game_pixels, spr_game_cmap);
+
+       wait_vblank();
+       spr_clear();
+       spr_oam_clear(oam, 0);
+       spr_oam_clear(oam, 1);
+       spr_oam_clear(oam, 2);
+       spr_oam_clear(oam, 3);
+
        cdst = (uint16_t*)CRAM_BG_ADDR;
        csrc = tuncross_cmap;
        for(i=0; i<256; i++) {
@@ -36,10 +57,18 @@ void gamescr(void)
        tex = iwram_sbrk(32 * 32);
        memcpy(tex, tuncross_pixels, 32 * 32);
 
+       /*select_input(BN_DPAD);*/
+
+       mask(INTR_VBLANK);
+       screen_vblank = vblank;
+       unmask(INTR_VBLANK);
+
        nframes = 0;
        for(;;) {
                backbuf = ++nframes & 1;
 
+               bnstate = ~REG_KEYINPUT;
+
                draw_tunnel();
 
                vblperf_end();
@@ -52,6 +81,7 @@ void gamescr(void)
 __attribute__((noinline, target("arm"), section(".iwram")))
 static void draw_tunnel(void)
 {
+       static int uoffs;
        int i, j, tx, ty, angle, depth, zoffs;
        uint16_t pptop, ppbot;
        uint16_t *top, *bot;
@@ -59,30 +89,38 @@ static void draw_tunnel(void)
 
        zoffs = nframes;
 
+       if(bnstate & BN_LT) uoffs++;
+       if(bnstate & BN_RT) uoffs--;
+
        top = vram[backbuf];
        bot = vram[backbuf] + 159 * 240 / 2;
        tunptr = tunmap;
        for(i=0; i<80; i++) {
+#ifdef VBLBAR
                top++;
                bot++;
                tunptr++;
+
                for(j=1; j<240/2; j++) {
+#else
+               for(j=0; j<240/2; j++) {
+#endif
                        tun = *tunptr++;
 
                        angle = tun & 0xff;
                        depth = (tun >> 8) & 0xff;
-                       tx = ((angle >> 1) + zoffs) & 0x1f;
+                       tx = ((angle >> 1) + uoffs) & 0x1f;
                        ty = ((depth >> 1) + zoffs) & 0x1f;
                        pptop = tex[(ty << 5) + tx];
-                       tx = ((angle >> 1) - zoffs) & 0x1f;
+                       tx = ~((angle >> 1) - uoffs) & 0x1f;
                        ppbot = tex[(ty << 5) + tx];
 
                        angle = (tun >> 16) & 0xff;
                        depth = (tun >> 24) & 0xff;
-                       tx = ((angle >> 1) + zoffs) & 0x1f;
+                       tx = ((angle >> 1) + uoffs) & 0x1f;
                        ty = ((depth >> 1) + zoffs) & 0x1f;
                        pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
-                       tx = ((angle >> 1) - zoffs) & 0x1f;
+                       tx = ~((angle >> 1) - uoffs) & 0x1f;
                        ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
 
                        *top++ = pptop;
@@ -91,3 +129,45 @@ static void draw_tunnel(void)
                bot -= 240;
        }
 }
+
+__attribute__((noinline, target("arm"), section(".iwram")))
+static void vblank(void)
+{
+       uint16_t bnstate;
+       int16_t mat[4];
+       static short gate_speed;
+
+       bnstate = ~REG_KEYINPUT;
+       if(bnstate & BN_DPAD) {
+               if(gate_speed < 5) {
+                       gate_speed++;
+               }
+
+               if(bnstate & BN_LEFT) x -= gate_speed;
+               if(bnstate & BN_RIGHT) x += gate_speed;
+               if(bnstate & BN_UP) y -= gate_speed;
+               if(bnstate & BN_DOWN) y += gate_speed;
+
+               if(x < 0) x = 0;
+               if(x > 239) x = 239;
+               if(y < 0) y = 0;
+               if(y > 159) y = 159;
+       } else {
+               gate_speed = 0;
+       }
+
+       if(bnstate & BN_A) rot -= 2;
+       if(bnstate & BN_B) rot += 2;
+
+       spr_oam(oam, 0, 512 + 256, x - 64, y - 64, SPR_256COL | SPR_SZ64 | SPR_DBLSZ |
+                       SPR_ROTSCL | SPR_ROTSCL_SEL(0));
+
+       mat[0] = COS(rot) << 1;
+       mat[1] = -SIN(rot) << 1;
+       mat[2] = SIN(rot) << 1;
+       mat[3] = COS(rot) << 1;
+       spr_transform(oam, 0, mat);
+
+
+       dma_copy16(3, (void*)OAM_ADDR, oam, sizeof oam / 2, 0);
+}