-/*
- * Written by Nick Kovac with minor changes by Claudio Matsuoka
- */
-
-#include "common.h"
-
-int frame_count = 0;
-int cop_drop = 0;
-uint8_t *cop_pal;
-int do_pal = 0;
-int cop_start = 0;
-int cop_scrl = 0;
-int cop_plz = 1;
-
-static int dtau[65];
-
-uint8_t fadepal[768 * 2];
-uint8_t *cop_fadepal;
-
-extern int l1, l2, l3, l4;
-extern int k1, k2, k3, k4;
-extern int il1, il2, il3, il4;
-extern int ik1, ik2, ik3, ik4;
-extern int ttptr;
-
-
-void pompota(void);
-void moveplz(void);
-void do_drop(void);
-void initpparas(void);
-
-
-int init_copper()
-{
- int ccc;
-
- for (ccc = 0; ccc < 65; ccc++) {
- dtau[ccc] = ccc * ccc / 4 * 43 / 128 + 60;
- }
-
- return 0;
-}
-
-int close_copper()
-{
- return 0;
-}
-
-// [nk] just before retrace
-void copper1()
-{
- // There is also assembly code to set the first pixel of
- // display memory here, but it may not be necessary.
-
- vga_set_hscroll_offset(cop_scrl);
-}
-
-// [nk] in retrace
-void copper2()
-{
- // [nk] Don't think this is used.
- frame_count++;
-
- if (do_pal != 0) {
- do_pal = 0;
- vga_upload_palette(cop_pal);
- }
-
- pompota();
- moveplz();
-
- if (cop_drop != 0)
- {
- do_drop();
- }
-}
-
-void pompota()
-{
-
- // [NK 18/1/2014] Disable this for now, as it looks a bit jittery.
- return;
-
-#if 0
- // [NK] This function toggles the horizontal split point every frame
- // [NK] between line 60 and 61, and toggles the horizontal offset between 0 and 4.
- // [NK] I think the original intention of this code was to give more variation
- // [NK] cheaply, almost like a cheap alpha blend between two plasmas, but
- // [NK] it seems to cause a lot of flicker in the port. Perhaps more precise timing is
- // [NK] required to give the original effect? In any case I disabled this code
- // [NK] temporarily.
-
- vga_set_line_compare(60);
- cop_scrl = 4;
-
- pompi++;
-
- if ((pompi & 1) != 0)
- {
- // [NK 12/1/2014] Moving the starting line up and down each alternate frame
- // [NK 12/1/2014] doesn't look good in windowed mode.
- // [NK 13/1/2014] Seems to work okay in fullscreen mode though.
- vga_set_line_compare(61);
- cop_scrl = 0;
- }
-#endif
-}
-
-void moveplz()
-{
- k1 += -3;
- k1 &= 4095;
- k2 += -2;
- k2 &= 4095;
- k3 += 1;
- k3 &= 4095;
- k4 += 2;
- k4 &= 4095;
-
- l1 += -1;
- l1 &= 4095;
- l2 += -2;
- l2 &= 4095;
- l3 += 2;
- l3 &= 4095;
- l4 += 3;
- l4 &= 4095;
-}
-
-void do_drop()
-{
- cop_drop++;
-
- if (cop_drop <= 64) {
- vga_set_line_compare(dtau[cop_drop]);
- } else {
- //@@over
-
- int bShouldFade = 0;
-
- if (cop_drop >= 256) {
- } else if (cop_drop >= 128) {
- bShouldFade = 1;
- } else if (cop_drop > 96) {
- } else /*if (cop_drop > 64) */{
- bShouldFade = 1;
- }
-
- if (bShouldFade) {
- cop_pal = fadepal;
- do_pal = 1;
-
- if (cop_drop == 65) {
- vga_set_line_compare(400);
- initpparas();
- } else {
- int i, ccc;
-
- vga_set_line_compare(60);
-
- // [NK 9/1/2014] Fade the palette using 8.8 fixed point numbers.
-
- uint8_t* pcop_fadepal = cop_fadepal;
- uint8_t* pfadepal = fadepal;
-
- for (i = 0; i < (768 / 16); i++) {
- for (ccc = 0; ccc < 16; ccc++) {
- uint8_t al = pcop_fadepal[ccc*2];
- uint8_t ah = pcop_fadepal[(ccc*2) + 1];
-
- uint8_t oldval = pfadepal[ccc + 768];
- pfadepal[ccc + 768] += al;
- uint8_t newval = pfadepal[ccc + 768];
- uint8_t carry = 0;
- if (newval < oldval) {
- carry = 1;
- }
-
- pfadepal[ccc] += ah + carry;
- }
-
- pcop_fadepal += 32;
- pfadepal += 16;
- }
- }
- } else {
- cop_drop = 0;
- }
- }
-}
-
-void initpparas()
-{
- l1 = il1;
- l2 = il2;
- l3 = il3;
- l4 = il4;
-
- k1 = ik1;
- k2 = ik2;
- k3 = ik3;
- k4 = ik4;
-}
-
+#include "copper.h"\r
+\r
+int far cop_drop;\r
+int far cop_plz;\r
+int far cop_start;\r
+char far * cop_fadepal;\r
+char fadepal[768];\r
+char far *cop_pal;\r
+\r
+word dtau[66];\r
+\r
+int init_copper()\r
+{\r
+ word ccc;\r
+ for (ccc = 0; ccc < 65; ccc++)\r
+ {\r
+ dtau[ccc] = floor(ccc * ccc / 4 * 43 / 128 + 60);\r
+ }\r
+ return 0;\r
+}\r
+\r
+int close_copper()\r
+{\r
+__asm{\r
+ mov bx,7\r
+ mov ax,0\r
+ mov cx,0\r
+ mov dx,0\r
+ int 0fcH\r
+ mov bx,7\r
+ mov ax,1\r
+ mov cx,0\r
+ mov dx,0\r
+ int 0fcH\r
+ mov bx,7\r
+ mov ax,2\r
+ mov cx,0\r
+ mov dx,0\r
+ int 0fcH\r
+}\r
+ return 0;\r
+}\r
projects / plz.git / blobdiff