87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
#include <display.h>
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#include <cpu.h>
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#define HIGH_BIT(b) ((b & 0x80) >> 7)
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#define LO_BIT(b) ((b >> 0) & 1)
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void display_set_register_selector(display_t* display, uint8_t value){
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//printf("set register selector to %d\n", value);
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display->register_selector = value;
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}
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void display_set_data_register(display_t* display, uint8_t value, cpu_status_t* status){
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//printf("\e[35mset data register to %d register selector is %d\e[39m\n", value, display->register_selector);
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if(display->register_selector == 8){
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if(value==4){display->x=0;SDL_RenderPresent(display->renderer);return;}
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display->line = value-128;
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if(status->log)
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printf("\e[35mline to %d\e[39m\n", value-128+1);
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}
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if(display->register_selector == 10){
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for(int b=0;b<8;b++){
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if(HIGH_BIT(value << b) == 1){
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display_pixel_on(display, display->x*8+b , display->line);
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}
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else {
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display_pixel_off(display, display->x*8+b , display->line);
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}
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//printf("pix %d %d\n", display->x*8+b, display->line);
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}
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display->x++;
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}
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}
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void display_pixel_on(display_t* display, int x, int y){
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SDL_SetRenderDrawColor(display->renderer, 70,65,69,255);
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SDL_Rect rect;
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rect.h = 3;
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rect.w = 3;
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rect.x = x * 3;
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rect.y = y * 3;
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SDL_RenderFillRect(display->renderer,&rect);
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}
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void display_pixel_off(display_t* display, int x, int y){
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SDL_SetRenderDrawColor(display->renderer, 179,204,174,255);
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SDL_Rect rect;
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rect.h = 3;
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rect.w = 3;
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rect.x = x * 3;
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rect.y = y * 3;
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SDL_RenderFillRect(display->renderer,&rect);
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}
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void display_clear(display_t* display){
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SDL_SetRenderDrawColor(display->renderer, 179,204,174,255);
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SDL_RenderClear(display->renderer);
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}
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void display_update(display_t* display, cpu_status_t* status){
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for(int i=0; i<1024; i++){
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uint8_t byte = status->vram[i];
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for(int b=0; b<8;b++){
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if(HIGH_BIT(byte << b) == 1){
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int nb = b+1;
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int y = i/16;
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int x = (i%16)*8+b;
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display_pixel_on(display, x , y);
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}
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else{
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int nb = b+1;
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int y = i/16;
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int x = (i%16)*8+b;
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display_pixel_off(display, x , y);
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}
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}
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}
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SDL_RenderPresent(display->renderer);
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}
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void display_init(display_t* display){
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SDL_Init( SDL_INIT_VIDEO );
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display->window = SDL_CreateWindow("nemu", 100, 100, 3*128, 3*64, SDL_WINDOW_SHOWN);
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display->renderer = SDL_CreateRenderer(display->window, -1, NULL);
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display_clear(display);
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}
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