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#include "emul.h"
#include <stdio.h>
#include <stdlib.h>
void emul_init( emul_t *emul, cpu_6502_t *cpu, bus_t *bus, int width, int height )
{
emul->cpu = cpu;
emul->bus = bus;
emul->gui = false;
emul->width = width;
emul->height = height;
emul->debug = false;
}
void emul_start( emul_t *emul )
{
if( emul->gui ) {
#ifdef WITH_GUI
int rt = SDL_Init( SDL_INIT_TIMER | SDL_INIT_AUDIO | SDL_INIT_VIDEO );
if( rt < 0 ) {
fprintf( stderr, "ERROR: SDL_Init failed: %s\n", SDL_GetError( ) );
exit( EXIT_FAILURE );
}
atexit( SDL_Quit );
SDL_ShowCursor( SDL_ENABLE );
int display = -1;
for( int i = 0; i < SDL_GetNumVideoDisplays( ); i++ ) {
SDL_Rect rect;
if( SDL_GetDisplayBounds( i, &rect ) == 0 ) {
fprintf( stderr, "INFO: display %d has dimensions %dx%d\n",
i, rect.w, rect.h );
display = i;
} else {
fprintf( stderr, "ERROR: SDL_GetDisplayBounds failed: %s\n", SDL_GetError( ) );
exit( EXIT_FAILURE );
}
}
if( display < 0 ) {
fprintf( stderr, "ERROR: no video display found\n" );
exit( EXIT_FAILURE );
}
emul->window = SDL_CreateWindow( "6502 emu",
SDL_WINDOWPOS_UNDEFINED_DISPLAY( display ),
SDL_WINDOWPOS_UNDEFINED_DISPLAY( display ),
emul->width, emul->height, 0 );
if( emul->window == NULL ) {
fprintf( stderr, "ERROR: SDL_CreateWindow failed: %s\n", SDL_GetError( ) );
exit( EXIT_FAILURE );
}
emul->renderer = SDL_CreateRenderer( emul->window, -1, 0 );
if( emul->renderer == NULL ) {
fprintf( stderr, "ERROR: SDL_Renderer failed: %s\n", SDL_GetError( ) );
exit( EXIT_FAILURE );
}
SDL_ShowWindow( emul->window );
SDL_SetRenderDrawColor( emul->renderer, 0, 0, 0, 255 );
SDL_RenderClear( emul->renderer );
emul->background_image = SDL_LoadBMP( "../other/breadboard.bmp" );
emul->background_texture = SDL_CreateTextureFromSurface( emul->renderer, emul->background_image );
SDL_RenderCopy( emul->renderer, emul->background_texture, NULL, NULL );
SDL_RenderPresent( emul->renderer );
#else
fprintf( stderr, "WARN: gui enabled and not compiled with WITH_GUI (SDL2)\n" );
#endif
}
}
void emul_run( emul_t *emul, int nof_steps )
{
#ifdef WITH_GUI
if( emul->gui ) {
SDL_Event event;
bool done = false;
while( !done ) {
uint32_t frame_start = SDL_GetTicks( );
SDL_PollEvent( &event );
switch( event.type ) {
case SDL_KEYDOWN:
switch( event.key.keysym.sym ) {
case SDLK_ESCAPE:
done = true;
break;
}
break;
case SDL_QUIT:
done = true;
break;
}
cpu_6502_run( emul->cpu, CPU_FREQUENCY / DISPLAY_FPS );
if( emul->debug ) {
cpu_6502_print_state( emul->cpu, 0 );
}
SDL_RenderCopy( emul->renderer, emul->background_texture, NULL, NULL );
for( int i = 0; i < emul->bus->nof_devices; i++ ) {
device_t *device = emul->bus->devices[i].device;
device->vtable->draw( device, emul->renderer );
}
SDL_RenderPresent( emul->renderer );
uint32_t frame_end = SDL_GetTicks( );
int delay = frame_start + 1000 / DISPLAY_FPS - frame_end;
if( delay > 0 ) {
SDL_Delay( delay );
}
if( nof_steps != -1 && emul->cpu->steps > nof_steps ) {
fprintf( stderr, "INFO: final number of steps reached (%d), terminating now\n", emul->cpu->steps );
done = true;
}
}
} else {
cpu_6502_run( emul->cpu, nof_steps );
}
#else
cpu_6502_run( emul->cpu, nof_steps );
#endif
}
void emul_free( emul_t *emul )
{
#ifdef WITH_GUI
if( emul->gui ) {
SDL_DestroyTexture( emul->background_texture );
SDL_FreeSurface( emul->background_image );
SDL_DestroyRenderer( emul->renderer );
SDL_DestroyWindow( emul->window );
}
#endif
}
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