- [NEW] zxscreen

- [NEW] F8 para execució
- [NEW] F5 continua execució
- [NEW] ULA synch interrupt
- [NEW] Break on read/write
- [FIX] INC8 and DEC8 did wrong flags calculations
- [FIX] INCMEM8 and DECMEM8 did no flags calculation at all
- [NEW] Flags visualization
- [DEL] run command replaced by cont command
- [NEW] reset command
- [NEW] Breakpoint delete command

zxscreen.cpp

@@ -0,0 +1,65 @@
+#include "zxscreen.h"
+#include "z80.h"
+#include <SDL2/SDL.h>
+
+namespace zxscreen
+{
+    uint32_t palette[16] = {
+        0x000000, 0x000080, 0x800000, 0x800080, 0x008000, 0x008080, 0x808000, 0x808080,
+        0x000000, 0x0000FF, 0xFF0000, 0xFF00FF, 0x00FF00, 0x00FFFF, 0xFFFF00, 0xFFFFFF
+    };
+    SDL_Window *win = nullptr;
+    SDL_Renderer *ren = nullptr;
+    SDL_Texture *tex = nullptr;
+
+    void show()
+    {
+        if (win) return;
+        win = SDL_CreateWindow("ZX Spectrum Screen", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 352, 288, SDL_WINDOW_RESIZABLE);
+        ren = SDL_CreateRenderer(win, -1, 0);
+        tex = SDL_CreateTexture(ren, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, 352, 288);
+        refresh();
+    }
+
+    void refresh()
+    {
+        const uint8_t* memory = z80::getMem();
+        //memory+=0x4000;
+
+        Uint32* pixels;
+        int pitch;
+        SDL_LockTexture(tex, NULL, (void**)&pixels, &pitch);
+
+        // Upper border
+        for (int i=0; i<352*48;++i) *(pixels++) = palette[7];
+
+        // scanlines
+        for (uint8_t y=0; y<192; ++y)
+        {
+            // Left border
+            for (int j=0;j<48;++j) *(pixels++) = palette[7];
+
+            // Actual screen
+            for (uint8_t x=0;x<32;++x)
+            {
+                uint16_t address = 0x4000 | (x&0x1f) | ((y&0x7)<<8) | ((y&0x38)<<2) | ((y&0xc0)<<5);
+                uint8_t block = memory[address];
+                for (int i=0;i<8;++i)
+                {
+                    *(pixels++)=(block&0x80) ? palette[7] : palette[0];
+                    block = block<<1;
+                }
+            }
+
+            // Right border
+            for (int j=0;j<48;++j) *(pixels++) = palette[7];
+        }
+
+        // Lower border
+        for (int i=0; i<352*48;++i) *(pixels++)=palette[7];
+
+        SDL_UnlockTexture(tex);
+        SDL_RenderCopy(ren, tex, NULL, NULL);
+        SDL_RenderPresent(ren);
+    }
+}