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https://github.com/deater/dos33fsprogs.git
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tfv: re-arrange the multiplies so we can use self-modifying feature
This commit is contained in:
Vince Weaver
parent
7b3127a3ea
commit
7a7344f689
@ -43,6 +43,8 @@
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#define SPEED 0x7b
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#define SPLASH_COUNT 0x7c
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#define OVER_WATER 0x7d
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#define TEMP2_I 0x7e
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#define TEMP2_F 0x7f
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#define SHIPY 0xE4
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@ -236,6 +238,11 @@ static unsigned char square1_lo[512];
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static unsigned char square1_hi[512];
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static unsigned char square2_lo[512];
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static unsigned char square2_hi[512];
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static int sm1a,sm3a,sm5a,sm7a;
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static int sm2a,sm4a,sm6a,sm8a;
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static int sm1b,sm3b,sm5b,sm7b;
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static int sm2b,sm4b,sm6b,sm8b;
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static int table_ready=0;
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@ -279,7 +286,7 @@ static int fixed_mul_unsigned(
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unsigned char x_i, unsigned char x_f,
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unsigned char y_i, unsigned char y_f,
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unsigned char *z_i, unsigned char *z_f,
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int debug) {
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int debug, int reuse) {
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// <T1 * <T2 = AAaa
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// <T1 * >T2 = BBbb
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@ -296,10 +303,6 @@ static int fixed_mul_unsigned(
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// ; Setup T1 if changed
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int c=0;
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int a,x;
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int sm1a,sm3a,sm5a,sm7a;
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int sm2a,sm4a,sm6a,sm8a;
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int sm1b,sm3b,sm5b,sm7b;
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int sm2b,sm4b,sm6b,sm8b;
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int _AA,_BB,_CC,_DD,_aa,_bb,_cc,_dd;
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@ -308,7 +311,7 @@ static int fixed_mul_unsigned(
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// printf("\t\t\tMultiplying %2x:%2x * %2x:%2x\n",x_i,x_f,y_i,y_f);
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/* Set up self-modifying code */
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if (c==0) {
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if (reuse==0) {
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a=(x_f)&0xff; // lda T1+0 ; 3
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sm1a=a; // sta sm1a+1 ; 3
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sm3a=a; // sta sm3a+1 ; 3
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@ -510,11 +513,11 @@ urgh:
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/* signed */
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static void fixed_mul(unsigned char x_i, unsigned char x_f,
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unsigned char y_i, unsigned char y_f,
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unsigned char *z_i, unsigned char *z_f) {
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unsigned char *z_i, unsigned char *z_f, int reuse) {
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int a,c;
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fixed_mul_unsigned(x_i,x_f,y_i,y_f,z_i,z_f,0);
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fixed_mul_unsigned(x_i,x_f,y_i,y_f,z_i,z_f,0,reuse);
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// jsr multiply_16bit_unsigned ; 6
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a=(x_i&0xff); // lda T1+1 ; 3
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@ -785,9 +788,10 @@ void draw_background_mode7(void) {
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cycles.mode7+=28;
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/* FIXME: only do this if SPACEZ changes? */
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// mul
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fixed_mul(ram[SPACEZ_I],ram[SPACEZ_F],
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CONST_BETA_I,CONST_BETA_F,
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&ram[FACTOR_I],&ram[FACTOR_F]);
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&ram[FACTOR_I],&ram[FACTOR_F],0);
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if (!displayed) {
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printf("SPACEZ/BETA/FACTOR %x %x * %x %x = %x %x\n",
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@ -824,7 +828,7 @@ void draw_background_mode7(void) {
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//mul // calculate the distance of the line we are drawing
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fixed_mul(ram[HORIZ_SCALE_I],ram[HORIZ_SCALE_F],
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CONST_SCALE_I,CONST_SCALE_F,
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&ram[DISTANCE_I],&ram[DISTANCE_F]);
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&ram[DISTANCE_I],&ram[DISTANCE_F],0);
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cycles.mode7+=44;
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if (!displayed) {
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printf("DISTANCE %x:%x\n",ram[DISTANCE_I],ram[DISTANCE_F]);
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@ -837,9 +841,9 @@ void draw_background_mode7(void) {
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cycles.mode7+=29;
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// mul
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fixed_mul(ram[DX_I],ram[DX_F],
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ram[HORIZ_SCALE_I],ram[HORIZ_SCALE_F],
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&ram[DX_I],&ram[DX_F]);
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fixed_mul(ram[HORIZ_SCALE_I],ram[HORIZ_SCALE_F],
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ram[DX_I],ram[DX_F],
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&ram[DX_I],&ram[DX_F],1);
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cycles.mode7+=48;
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if (!displayed) {
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printf("DX %x:%x\n",ram[DX_I],ram[DX_F]);
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@ -849,9 +853,10 @@ void draw_background_mode7(void) {
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ram[DY_I]=fixed_sin[(ram[ANGLE]+4)&0xf].i; // cos()
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ram[DY_F]=fixed_sin[(ram[ANGLE]+4)&0xf].f; // cos()
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cycles.mode7+=29;
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fixed_mul(ram[DY_I],ram[DY_F],
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ram[HORIZ_SCALE_I],ram[HORIZ_SCALE_F],
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&ram[DY_I],&ram[DY_F]);
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// mul
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fixed_mul(ram[HORIZ_SCALE_I],ram[HORIZ_SCALE_F],
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ram[DY_I],ram[DY_F],
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&ram[DY_I],&ram[DY_F],1);
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cycles.mode7+=48;
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if (!displayed) {
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printf("DY %x:%x\n",ram[DY_I],ram[DY_F]);
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@ -869,23 +874,38 @@ void draw_background_mode7(void) {
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ram[TEMP_I]=fixed_sin[(ram[ANGLE]+4)&0xf].i; // cos
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ram[TEMP_F]=fixed_sin[(ram[ANGLE]+4)&0xf].f; // cos
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cycles.mode7+=29;
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// mul
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fixed_mul(ram[SPACEX_I],ram[SPACEX_F],
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ram[TEMP_I],ram[TEMP_F],
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&ram[SPACEX_I],&ram[SPACEX_F]);
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&ram[SPACEX_I],&ram[SPACEX_F],0);
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cycles.mode7+=48;
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fixed_add(ram[SPACEX_I],ram[SPACEX_F],
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ram[CX_I],ram[CX_F],
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&ram[SPACEX_I],&ram[SPACEX_F]);
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ram[TEMP_I]=0xec; // -20 (LOWRES_W/2)
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ram[TEMP_F]=0;
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ram[TEMP_I]=fixed_sin[ram[ANGLE]&0xf].i;
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ram[TEMP_F]=fixed_sin[ram[ANGLE]&0xf].f;
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cycles.mode7+=25;
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// mul
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fixed_mul(ram[SPACEY_I],ram[SPACEY_F],
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ram[TEMP_I],ram[TEMP_F],
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&ram[SPACEY_I],&ram[SPACEY_F],0);
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cycles.mode7+=48;
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fixed_add(ram[SPACEY_I],ram[SPACEY_F],
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ram[CY_I],ram[CY_F],
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&ram[SPACEY_I],&ram[SPACEY_F]);
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ram[TEMP2_I]=0xec; // -20 (LOWRES_W/2)
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ram[TEMP2_F]=0;
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cycles.mode7+=30;
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fixed_mul(ram[TEMP_I],ram[TEMP_F],
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// mul
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fixed_mul(ram[TEMP2_I],ram[TEMP2_F],
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ram[DX_I],ram[DX_F],
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&ram[TEMP_I],&ram[TEMP_F]);
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&ram[TEMP_I],&ram[TEMP_F],0);
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cycles.mode7+=48;
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fixed_add(ram[SPACEX_I],ram[SPACEX_F],
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@ -897,22 +917,14 @@ void draw_background_mode7(void) {
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ram[SPACEX_I],ram[SPACEX_F]);
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}
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ram[TEMP_I]=fixed_sin[ram[ANGLE]&0xf].i;
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ram[TEMP_F]=fixed_sin[ram[ANGLE]&0xf].f;
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cycles.mode7+=25;
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fixed_mul(ram[SPACEY_I],ram[SPACEY_F],
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ram[TEMP_I],ram[TEMP_F],
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&ram[SPACEY_I],&ram[SPACEY_F]);
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cycles.mode7+=48;
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fixed_add(ram[SPACEY_I],ram[SPACEY_F],
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ram[CY_I],ram[CY_F],
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&ram[SPACEY_I],&ram[SPACEY_F]);
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ram[TEMP_I]=0xec; // -20 (LOWRES_W/2)
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ram[TEMP_F]=0;
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// ram[TEMP_I]=0xec; // -20 (LOWRES_W/2)
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// ram[TEMP_F]=0;
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cycles.mode7+=30;
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fixed_mul(ram[TEMP_I],ram[TEMP_F],
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// mul
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fixed_mul(ram[TEMP2_I],ram[TEMP2_F],
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ram[DY_I],ram[DY_F],
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&ram[TEMP_I],&ram[TEMP_F]);
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&ram[TEMP_I],&ram[TEMP_F],1);
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cycles.mode7+=48;
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fixed_add(ram[SPACEY_I],ram[SPACEY_F],
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ram[TEMP_I],ram[TEMP_F],
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@ -971,14 +983,14 @@ int flying(void) {
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memset(&cycles,0,sizeof(cycles));
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fixed_mul(0x1,0x0,
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0x2,0x0,
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&ram[FACTOR_I],&ram[FACTOR_F]);
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&ram[FACTOR_I],&ram[FACTOR_F],0);
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printf("Multiplying 1.0 * 2.0 = %d.%d, took %d cycles\n",
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ram[FACTOR_I],ram[FACTOR_F],cycles.multiply);
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memset(&cycles,0,sizeof(cycles));
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fixed_mul(0xff,0xff,
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0xff,0xff,
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&ram[FACTOR_I],&ram[FACTOR_F]);
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&ram[FACTOR_I],&ram[FACTOR_F],0);
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printf("Multiplying ff.ff * ff.ff = %d.%d, took %d cycles\n",
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ram[FACTOR_I],ram[FACTOR_F],cycles.multiply);
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