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cc65/libsrc/tgi/tgi_load.c
cuz 579e1ae267 TGI Implementation
git-svn-id: svn://svn.cc65.org/cc65/trunk@1315 b7a2c559-68d2-44c3-8de9-860c34a00d81
2002-06-21 16:25:56 +00:00

91 lines
2.1 KiB
C

/*
* TEST VERSION - CURRENTLY C64 SPECIFIC!!!
*/
#include <string.h>
#include <cbm.h>
#include <modload.h>
#include <tgi.h>
#include <tgi/tgi-kernel.h>
static unsigned char ReadInputBlock (struct mod_ctrl* C, void* Buf, unsigned Size)
{
return (cbm_read (1, Buf, Size) != Size);
}
void __fastcall__ tgi_load (unsigned char mode)
/* Install the matching driver for the given mode. Will just load the driver
* and check if loading was successul. Will not switch to gaphics mode.
*/
{
const char* name = tgi_map_mode (mode);
if (name == 0) {
/* No driver for this mode */
tgi_error = TGI_ERR_NO_DRIVER;
} else {
/* Laod the driver */
tgi_load_driver (name);
}
}
void __fastcall__ tgi_load_driver (const char* name)
/* Install the given driver. This function is identical to tgi_load with the
* only difference that the name of the driver is specified explicitly. You
* should NOT use this function in most cases, use tgi_load() instead.
*/
{
static const unsigned char marker[4] = { 0x74, 0x67, 0x69, 0x00 };
static struct mod_ctrl ctrl = {
ReadInputBlock /* read_block */
};
unsigned Res;
/* Check if we do already have a driver loaded. If so, remove it. */
if (tgi_drv != 0) {
tgi_unload ();
}
/* Now open the file */
if (cbm_open (1, 8, 2, name) != 0) {
tgi_error = TGI_ERR_CANNOT_LOAD;
return;
}
/* Load the module */
Res = mod_load (&ctrl);
cbm_close (1);
/* Check the return code */
if (Res == MLOAD_OK) {
/* Get a pointer to the loaded driver */
tgi_drv = (tgi_drv_header*) ctrl.module;
/* Check the header */
if (memcmp (tgi_drv, marker, sizeof (marker)) != 0) {
/* Invalid driver */
mod_free (tgi_drv);
tgi_drv = 0;
tgi_error = TGI_ERR_INV_DRIVER;
} else {
/* Driver is ok do setup */
tgi_setup ();
}
} else {
/* Error loading the driver */
tgi_error = TGI_ERR_CANNOT_LOAD;
}
}