138 lines
4.4 KiB
C
138 lines
4.4 KiB
C
// Load overlay files from CD and execute them
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// Schnappy 10-2021
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// With the help of Nicolas Noble and impiaa
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// https://discord.com/channels/642647820683444236/663664210525290507/894624082367229952
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#include "common.h"
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DISPENV disp[2]; // Double buffered DISPENV and DRAWENV
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DRAWENV draw[2];
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char primbuff[2][32768]; // double primitive buffer of length 32768 * 8 = 262.144 bits / 32,768 Kbytes
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u_long ot[2][OTLEN];
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char *nextpri = primbuff[0];
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uint8_t db = 0;
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CVECTOR BGcolor = { 0, 150, 255 };
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extern u_long load_all_overlays_here;
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typedef struct Overlay {
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char filename[0x7c];
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int (*main)();
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char commandline[0x180];
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} Overlay;
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int ovl_main_hello();
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int ovl_main_tile();
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int ovl_main_poly();
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Overlay g_chainload[] = {
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{"\\HELLO.OVL;1", ovl_main_hello, ""},
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{"\\TILE.OVL;1", ovl_main_tile, ""},
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{"\\POLY.OVL;1", ovl_main_poly, ""},
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//~ { "\\POLY.OVL;1" , 0 },
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};
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enum OverlayNumber next_overlay = MOTHERSHIP;
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enum OverlayNumber prev_overlay = MOTHERSHIP;
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int main(void);
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int loadOverlayAndStart(Overlay *);
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void EmptyOTag(u_long ot[2][OTLEN], char primbuff[2][32768], char * nextpri );
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void (*dispp) (void);
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int CDreadOK = 0;
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void init(void)
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{
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ResetCallback();
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ResetGraph(0); // Initialize drawing engine with a complete reset (0)
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// Initialize and setup the GTE
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InitGeom();
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SetGeomOffset(CENTERX,CENTERY);
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SetGeomScreen(CENTERX);
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SetDefDispEnv(&disp[0], 0, 0 , SCREENXRES, SCREENYRES); // Set display area for both &disp[0] and &disp[1]
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SetDefDispEnv(&disp[1], 0, SCREENYRES, SCREENXRES, SCREENYRES); // &disp[0] is on top of &disp[1]
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SetDefDrawEnv(&draw[0], 0, SCREENYRES, SCREENXRES, SCREENYRES); // Set draw for both &draw[0] and &draw[1]
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SetDefDrawEnv(&draw[1], 0, 0 , SCREENXRES, SCREENYRES); // &draw[0] is below &draw[1]
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// Set video mode
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if (VMODE){ SetVideoMode(MODE_PAL);}
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SetDispMask(1); // Display on screen
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setRGB0(&draw[0], BGcolor.r, BGcolor.g, BGcolor.b); // set color for first draw area
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setRGB0(&draw[1], BGcolor.r, BGcolor.g, BGcolor.b); // set color for second draw area
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draw[0].isbg = 1; // set mask for draw areas. 1 means repainting the area with the RGB color each frame
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draw[1].isbg = 1;
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PutDispEnv(&disp[db]); // set the disp and draw environnments
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PutDrawEnv(&draw[db]);
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FntLoad(960, 0); // Load font to vram at 960,0(+128)
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FntOpen(MARGINX, SCREENYRES - MARGINY - FONTSIZE, SCREENXRES - MARGINX * 2, FONTSIZE, 0, 280 ); // FntOpen(x, y, width, height, black_bg, max. nbr. chars
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}
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void display(void)
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{
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DrawSync(0); // Wait for all drawing to terminate
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VSync(0); // Wait for the next vertical blank
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PutDispEnv(&disp[db]); // set alternate disp and draw environnments
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PutDrawEnv(&draw[db]);
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DrawOTag(&ot[db][OTLEN - 1]);
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db = !db; // flip db value (0 or 1)
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nextpri = primbuff[db];
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}
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int loadOverlayAndStart(Overlay * overlay)
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{
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int CDreadResult = 0;
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int next_ovl = -1;
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// Load overlay file
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CDreadResult = CdReadFile(overlay->filename, &load_all_overlays_here, 0);
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CdReadSync(0, 0);
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printf( "CD read: %d", CDreadResult);
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// If file loaded sucessfully
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if (CDreadResult)
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{
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//~ StopCallback();
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ResetGraph(3);
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// Execute
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next_ovl = overlay->main();
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EmptyOTag(&ot[db], &primbuff[db], nextpri);
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setRGB(&BGcolor, 0, 150, 255);
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init();
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}
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return next_ovl;
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}
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void EmptyOTag(u_long ot[2][OTLEN], char primbuff[2][32768], char * nextpri )
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{
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for (uint16_t p; p < OTLEN; p++)
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{
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ot[0][p] = 0;
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ot[1][p] = 0;
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}
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nextpri = primbuff[!db];
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}
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int main(void)
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{
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int t = 0;
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// init() display
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init();
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// Init CD system
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CdInit();
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prev_overlay = next_overlay;
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while(1){
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if (t == 100){
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next_overlay = OVERLAY_HELLO;
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}
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if (next_overlay != -1 && next_overlay != prev_overlay){
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prev_overlay = next_overlay;
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next_overlay = loadOverlayAndStart(&g_chainload[next_overlay]);
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t = 0;
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}
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t++;
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FntPrint("Mothership: %d\nOvl: %d %d", t, prev_overlay, next_overlay);
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FntFlush(-1);
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display();
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}
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//
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return 0;
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}
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