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ARM.c
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ARM.c
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#include "ARM.h"
#include "Worm.h"
#include "DS3D.h"
#include <nds.h>
#include <math.h>
void ClaimWRAM()
{
WRAM_CR=0;
asm volatile ("mcr p15,0,%0,C6,C2,0"::"r" (0x300002f));
}
void ITCM_CODE RenderTunnelAsm(uint16 *table,uint16 *vram,uint16 *texture,int t)
{
#if 0
/* uint32 *table32=(uint32 *)table;
uint16 *texture=(uint16 *)0x3000000;
uint32 *vram32=(uint32 *)vram;
for(int i=0;i<256*192/2;i++)
{
uint32 val=*table32++;
uint32 a=texture[(val>>16)+t];
uint32 b=texture[(val+t)&0xffff];
*vram32++=(a<<16)|b;
}*/
uint32 *table32=(uint32 *)table;
uint16 *textureptr=texture+(t&0x3fff);
uint32 *vram32=(uint32 *)vram;
for(int i=0;i<256*192/2;i++)
{
uint32 val=*table32++;
uint32 a=textureptr[val>>17];
uint32 b=textureptr[(val&0xffff)>>1];
*vram32++=(a<<16)|b;
}
#else
register uint32 r0 asm("r0")=(uint32)table;
register uint32 r1 asm("r1")=(uint32)vram;
register uint32 r2 asm("r2")=(uint32)(texture+(t&0x3fff));
register uint32 r3 asm("r3")=0x7fff;
register uint32 r14 asm("r14")=256*192/(2*8);
// r0: table
// r1: vram
// r2: texture
// r3: 0x7fff
// r4: tmp
// r5,r6,r7,r8,r9,r10: val
// r11: 256*192/(2*6)
asm volatile (
".tunnelloop:\n"
" ldmia r0!,{r5,r6,r7,r8,r9,r10,r11,r12} \n"
" ldr r4,[r2,r5,lsr #16] \n"
" and r5,r5,r3 \n"
" ldrh r5,[r2,r5] \n"
" orr r5,r5,r4,lsl #16 \n"
" ldr r4,[r2,r6,lsr #16] \n"
" and r6,r6,r3 \n"
" ldrh r6,[r2,r6] \n"
" orr r6,r6,r4,lsl #16 \n"
" ldr r4,[r2,r7,lsr #16] \n"
" and r7,r7,r3 \n"
" ldrh r7,[r2,r7] \n"
" orr r7,r7,r4,lsl #16 \n"
" ldr r4,[r2,r8,lsr #16] \n"
" and r8,r8,r3 \n"
" ldrh r8,[r2,r8] \n"
" orr r8,r8,r4,lsl #16 \n"
" ldr r4,[r2,r9,lsr #16] \n"
" and r9,r9,r3 \n"
" ldrh r9,[r2,r9] \n"
" orr r9,r9,r4,lsl #16 \n"
" ldr r4,[r2,r10,lsr #16] \n"
" and r10,r10,r3 \n"
" ldrh r10,[r2,r10] \n"
" orr r10,r10,r4,lsl #16 \n"
" ldr r4,[r2,r11,lsr #16] \n"
" and r11,r11,r3 \n"
" ldrh r11,[r2,r11] \n"
" orr r11,r11,r4,lsl #16 \n"
" ldr r4,[r2,r12,lsr #16] \n"
" and r12,r12,r3 \n"
" ldrh r12,[r2,r12] \n"
" orr r12,r12,r4,lsl #16 \n"
" stmia r1!,{r5,r6,r7,r8,r9,r10,r11,r12} \n"
" subs r14,r14,#1 \n"
" bne .tunnelloop \n"
:
:"r" (r0),"r" (r1),"r" (r2),"r" (r3),"r" (r14)
:"r4","r5","r6","r7","r8","r9","r10","r11","r12"
);
#endif
}
static inline void draw_vline(uint16 *reardepth,uint32 *divtable,int x,int y1,int y2,int c1,int c2)
{
// uint16 *ptr=((uint16 *)reardepth)+x+y1*256;
uint32 *ptr=((uint32 *)reardepth)+x+y1*128;
int n=y2-y1;
int dc=(c2-c1)*divtable[n];
int c=c1<<16;
while(n--)
{
*ptr=(c&0xffff0000)|((c>>16)&0xffff);
// *ptr=c>>16;
// ptr+=256;
ptr+=128;
c+=dc;
}
}
#define STR(x) #x
#define XSTR(x) STR(x)
#define C(x) "#" STR(x)
void ITCM_CODE RenderWormAsm(uint16 *reardepth,struct WormLookup *lookuptable,int t)
{
int w=256/2;
int mid=192/2;
uint32 *ptr=(uint32 *)reardepth;
// for(int i=0;i<256*192/2;i++) *ptr++=0;
for(int i=0;i<256*192/2;i++) *ptr++=0xffffffff;
//int u0=(int)(0*0x10000)&0xffff;
//int v0=(int)(t*0.003*0x10000)&0xffff;
// int du0=0.006*sinf(t*0.01)*0x10000;
//int du0=0.01*sinf(t*0.005)*0x10000;
//int dv0=0.001*0x10000;
int du=0x10000/(2*NUM_STRIPS-1);
int twist=isin(t/3);
reardepth+=mid*256;
int pos0=(int)(t*0.001*0x10000);
for(int x=0;x<w;x++)
{
//u0+=du0; v0+=dv0;
int pos=pos0+x*128;
int u0=(mulf32(isin(pos>>8),twist)*40)&0xffff;
int v0=(pos)&0xffff;
#if 1
register uint32 r2 asm("r2")=u0;
register uint32 r3 asm("r3")=du;
register uint32 r5 asm("r5")=(uint32)reardepth+x*4-512;
register uint32 r6 asm("r6")=(uint32)lookuptable;
register uint32 r10 asm("r10")=0x3000000+((v0>>1)&0x7f80);
// r0:
// r1: i
// r2: u
// r3: du
// r5: reardepth+x*2-512
// r6: lookuptable
// r7: lookuptable strips
// r8: prev_y
// r9: prev_c
// r10: 0x3000000+(v>>1)&0x7f80
// r11:
// r12:
// r14:
asm volatile(
" push {r2} \n"
" mov r1,#0 \n"
" add r7,r6,#1024 \n"
" mov r8,#1000 \n"
"upperloop: \n"
" and r14,r2,#0xfe00 \n"
" ldrb r14,[r10,r14,lsr #9]\n" // r14=h
" mov r12,r14,lsl #1 \n"
" ldrh r12,[r7,r12] \n" // r12=c=lookuptable->strip[i].depth[h]
" add r14,r14," C(MIN_HEIGHT) "\n"
" ldr r11,[r7,#256] \n"
" smulwb r14,r11,r14 \n"
" rsc r14,r14,#0 \n" // r14=y=-((h+MIN_HEIGHT)*lookuptable->strip[i].scale>>16)
" subs r11,r14,r8 \n" // r11=n=y-prev_y
" ble skipupper \n"
" push {r1,r2} \n"
" mov r1,r12 \n"
" orr r1,r1,lsl #16 \n"
" ldr r0,[r6,r11,lsl #2] \n"
" subs r2,r9,r12 \n"
" bmi drawtopdownupper \n"
" smulwb r0,r0,r2 \n" // r0=-dc=(prev_c-c)*divtable[n]>>16
" orr r0,r0,lsl #16 \n"
" add r2,r5,r14,lsl #9 \n" // r3=reardepth+x*2+y*512-256
" add r2,r2,#512 \n"
" rsc r11,r11,#32 \n"
" add pc,pc,r11,lsl #3 \n"
" nop \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" b enddrawloopupper \n"
"drawtopdownupper: \n"
" rsc r2,r2,#0 \n"
" smulwb r0,r0,r2 \n" // r0=dc=(c-prev_c)*divtable[n]>>16
" orr r0,r0,lsl #16 \n"
" add r2,r5,r8,lsl #9 \n" // r3=reardepth+x*2+prev_y*512-256
" rsc r11,r11,#33 \n"
" add pc,pc,r11,lsl #3 \n"
" nop \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
"enddrawloopupper: \n"
" pop {r1,r2} \n"
"skipupper: \n"
" mov r8,r14 \n" // r8=prev_y=-(-y)
" mov r9,r12 \n" // r9=prev_c=c
" add r2,r2,r3 \n"
" add r7,r7,#260 \n"
" add r1,r1,#1 \n"
" cmp r1," C(NUM_STRIPS) "\n"
" bne upperloop \n"
// lower half
" pop {r2} \n"
" mov r1,#0 \n"
" add r7,r6,#1024 \n"
" mvn r8,#1000 \n"
"lowerloop: \n"
" and r14,r2,#0xfe00 \n"
" ldrb r14,[r10,r14,lsr #9]\n" // r14=h
" mov r12,r14,lsl #1 \n"
" ldrh r12,[r7,r12] \n" // r12=c=lookuptable->strip[i].depth[h]
" add r14,r14," C(MIN_HEIGHT) "\n"
" ldr r11,[r7,#256] \n"
" smulwb r14,r11,r14 \n" // r14=y=((h+MIN_HEIGHT)*lookuptable->strip[i].scale>>16)
" subs r11,r8,r14 \n" // r11=n=prev_y-y
" ble skiplower \n"
" push {r1,r2} \n"
" mov r1,r12 \n"
" orr r1,r1,lsl #16 \n"
" ldr r0,[r6,r11,lsl #2] \n"
" subs r2,r12,r9 \n"
" bmi drawtopdownlower \n"
" smulwb r0,r0,r2 \n" // r0=-dc=(prev_c-c)*divtable[n]>>16
" orr r0,r0,lsl #16 \n"
" add r2,r5,r8,lsl #9 \n" // r3=reardepth+x*2+prev_y*512-256
" rsc r11,r11,#32 \n"
" add pc,pc,r11,lsl #3 \n"
" nop \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" str r1,[r2,#-512]! \n add r1,r1,r0 \n"
" b enddrawlooplower \n"
"drawtopdownlower: \n"
" rsc r2,r2,#0 \n"
" smulwb r0,r0,r2 \n" // r0=dc=(c-prev_c)*divtable[n]>>16
" orr r0,r0,lsl #16 \n"
" add r2,r5,r14,lsl #9 \n" // r3=reardepth+x*2+y*512-256
" sub r2,r2,#512 \n"
" rsc r11,r11,#33 \n"
" add pc,pc,r11,lsl #3 \n"
" nop \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
" str r1,[r2,#512]! \n add r1,r1,r0 \n"
"enddrawlooplower: \n"
" pop {r1,r2} \n"
"skiplower: \n"
" mov r8,r14 \n" // r8=prev_y=-(-y)
" mov r9,r12 \n" // r9=prev_c=c
" sub r2,r2,r3 \n"
" add r7,r7,#260 \n"
" add r1,r1,#1 \n"
" cmp r1," C(NUM_STRIPS) "\n"
" bne lowerloop \n"
:"=r" (r2)
:"r" (r2),"r" (r3),"r" (r5),"r" (r6),"r" (r10)
:"r0","r1","r4","r7","r8","r9","r11","r12","r14","cc"
);
#else
int u=u0;
int prev_y=1000,prev_c=0;
uint8 *map=(uint8 *)(0x3000000+((v0>>(16-MAP_V_SHIFT-MAP_U_SHIFT))&(MAP_V_MASK<<MAP_U_SHIFT)));
struct WormStripLookup *lookupstrip=lookuptable->strip;
// draw upper half
for(int i=0;i<NUM_STRIPS;i++)
{
int h=map[((u>>(16-MAP_U_SHIFT))&MAP_U_MASK)];
int y=-((h+MIN_HEIGHT)*lookupstrip->scale>>16);
int c=lookupstrip->depth[h];
if(y>prev_y)
{
draw_vline(reardepth,lookuptable->div,x,prev_y,y,prev_c,c);
}
prev_c=c; prev_y=y;
lookupstrip++;
u+=du;
}
prev_y=-1000;
u=u0;
lookupstrip=lookuptable->strip;
// draw lower half
for(int i=0;i<NUM_STRIPS;i++)
{
int h=map[((u>>(16-MAP_U_SHIFT))&MAP_U_MASK)];
int y=((h+MIN_HEIGHT)*lookupstrip->scale>>16);
int c=lookupstrip->depth[h];
if(y<prev_y)
{
draw_vline(reardepth,lookuptable->div,x,y,prev_y,c,prev_c);
}
prev_c=c; prev_y=y;
lookupstrip++;
u-=du;
}
#endif
}
}