118 lines
5.3 KiB
C
118 lines
5.3 KiB
C
// Load files from CD and execute them
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// Schnappy 07-2021
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#include <sys/types.h>
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#include <stdio.h>
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#include <libgte.h>
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#include <libetc.h>
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#include <libgpu.h>
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#include <libapi.h>
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// CD library
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#include <libcd.h>
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#include <malloc.h>
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#define VMODE 0 // Video Mode : 0 : NTSC, 1: PAL
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#define SCREENXRES 320 // Screen width
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#define SCREENYRES 240 + (VMODE << 4) // Screen height : If VMODE is 0 = 240, if VMODE is 1 = 256
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#define CENTERX SCREENXRES/2 // Center of screen on x
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#define CENTERY SCREENYRES/2 // Center of screen on y
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#define MARGINX 0 // margins for text display
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#define MARGINY 32
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#define FONTSIZE 8 * 7 // Text Field Height
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DISPENV disp[2]; // Double buffered DISPENV and DRAWENV
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DRAWENV draw[2];
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short db = 0; // index of which buffer is used, values 0, 1
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// CD specifics
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#define CD_SECTOR_SIZE 2048
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// Converting bytes to sectors SECTOR_SIZE is defined in words, aka int
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#define BtoS(len) ( ( len + CD_SECTOR_SIZE - 1 ) / CD_SECTOR_SIZE )
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// Name of file to load
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static char * loadFile;
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// libcd's CD file structure contains size, location and filename
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CdlFILE filePos = {0};
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//~ struct EXEC * exeStruct;
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// Define start address of allocated memory
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// Let's use an array so we don't have to worry about using a memory segment that's already in use.
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static unsigned char ramAddr[0x40000]; // https://discord.com/channels/642647820683444236/663664210525290507/864936962199781387
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// We could also set a memory address manually, but we have to make sure this won't get in the way of other routines.
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// void * ramAddr = (void *)0x80030D40;
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// Load data to this buffer
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u_long * dataBuffer;
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// Those are not strictly needed, but we'll use them to see the commands results.
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// They could be replaced by a 0 in the various functions they're used with.
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u_char CtrlResult[8];
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// Value returned by CDread() - 1 is good, 0 is bad
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int CDreadOK = 0;
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// Value returned by CDsync() - Returns remaining sectors to load. 0 is good.
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int CDreadResult = 0;
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void init(void)
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{
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ResetGraph(0); // Initialize drawing engine with a complete reset (0)
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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], 255, 50, 50); // set color for first draw area
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setRGB0(&draw[1], 255, 50, 50); // 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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db = !db; // flip db value (0 or 1)
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}
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int main(void)
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{
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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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// Init heap
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InitHeap((u_long *)ramAddr, sizeof(ramAddr));
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// If the other method was chosen at l.39
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// InitHeap((void *)0x80030D40, 0x40000);
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// Set name of file to load
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loadFile = "\\HELO.DAT;1";
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// Get file position from filename
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CdSearchFile( &filePos, loadFile);
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// Allocate memory
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dataBuffer = malloc( BtoS(filePos.size) * CD_SECTOR_SIZE );
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// Issue CdlSetloc CDROM command : Set the seek target position
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// Beware of a misnomed 'sector' member in the CdlLOC struct that should really be named 'frame'.
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// https://discord.com/channels/642647820683444236/663664210525290507/864912470996942910
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CdControl(CdlSetloc, (u_char *)&filePos.pos, CtrlResult);
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// Read data and load it to dataBuffer
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CDreadOK = CdRead( (int)BtoS(filePos.size), (u_long *)dataBuffer, CdlModeSpeed );
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// Wait for operation to complete
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CDreadResult = CdReadSync(0, 0);
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while (1) // infinite loop
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{
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// Print the content of the loaded file - See HELO.DAT
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FntPrint("%s%d\n", (char *)dataBuffer, VSync(-1));
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// Print heap and buffer addresses
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FntPrint("Heap: %x - Buf: %x\n", ramAddr, dataBuffer);
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// Print returned values
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FntPrint("CdCtrl: %d\nRead : %d %d\n", CtrlResult[0], CDreadOK, CDreadResult);
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// Print filesize in bytes/sectors
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FntPrint("Size: %dB sectors: %d", filePos.size, BtoS(filePos.size));
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FntFlush(-1); // Draw print stream
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display(); // Execute display()
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}
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return 0;
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}
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