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-rw-r--r--include/zx81.h2
-rw-r--r--source/framebuffer.c6
-rw-r--r--source/main.c83
-rw-r--r--source/zx81.c161
4 files changed, 246 insertions, 6 deletions
diff --git a/include/zx81.h b/include/zx81.h
index 770a132..912a106 100644
--- a/include/zx81.h
+++ b/include/zx81.h
@@ -39,7 +39,7 @@ void ZX81Init(Z80 *z80);
/* Render the display
*/
-void ZX81RenderDisplay(Framebuffer *fb);
+void ZX81RenderDisplay(Framebuffer *fb, Z80 *z80);
/* Handle keypresses
*/
diff --git a/source/framebuffer.c b/source/framebuffer.c
index efdd27b..a06ef00 100644
--- a/source/framebuffer.c
+++ b/source/framebuffer.c
@@ -222,6 +222,12 @@ void FB_EndFrame(void)
}
+u16 FB_GetColour(FB_Colour col)
+{
+ return pal[col];
+}
+
+
void FB_Print(Framebuffer *fb, const char *text, int x, int y,
FB_Colour colour, FB_Colour paper)
{
diff --git a/source/main.c b/source/main.c
index b41efe6..8ea8e00 100644
--- a/source/main.c
+++ b/source/main.c
@@ -69,6 +69,7 @@ static const char *main_menu[]=
"Load Memory Snapshot",
"Save Joypad/Key State",
"Load Joypad/Key State",
+ "Help",
"Exit 3DS81",
"Cancel",
NULL
@@ -84,6 +85,7 @@ typedef enum
MenuLoadSnapshot,
MenuSaveMappings,
MenuLoadMappings,
+ MenuHelp,
MenuExit
} MenuOpt;
@@ -179,6 +181,80 @@ static void Splash(void)
}
+/* ---------------------------------------- HELP
+*/
+static void ShowHelp(void)
+{
+ struct
+ {
+ FB_Colour col;
+ const char *text;
+ }
+ help[] =
+ {
+ {COL_RED, "KEYBOARD"},
+ {COL_BLACK, "Use the touchscreen to press keys on the computer."},
+ {COL_BLACK, "The ZX81 had a keyword entry system, so when the"},
+ {COL_BLACK, "cursor is an inverse K then the keyword printed"},
+ {COL_BLACK, "at the top of the key is displayed. Therefore"},
+ {COL_BLACK, "to load a tape press the J key, then the SHIFT"},
+ {COL_BLACK, "key (which by default stays pressed until you"},
+ {COL_BLACK, "click it again) and press the P key to enter a"},
+ {COL_BLACK, "quote, press the SHIFT key to stop pressing it,"},
+ {COL_BLACK, "type the name of the .P file and close it with"},
+ {COL_BLACK, "another quote, then press ENTER"},
+ {COL_TRANSPARENT, ""},
+ {COL_RED, "LOADING TAPES"},
+ {COL_BLACK, "There are two ways of loading tapes in the"},
+ {COL_BLACK, "simulator. The first is to put .P files in"},
+ {COL_BLACK, "either the root directory of the SD card"},
+ {COL_BLACK, "or a directory called ZX81SNAP. Files from"},
+ {COL_BLACK, "either place can be loaded by typing"},
+ {COL_BLACK, "LOAD \"GAME\" to load GAME.P. Alternatively"},
+ {COL_BLACK, "you can type LOAD \"*\" to display a file"},
+ {COL_BLACK, "selector that allows you to select the tape"},
+ {COL_BLACK, "to load. LOAD \"\" can be used to load an"},
+ {COL_BLACK, "internal tape image once it has been selected."},
+ {COL_TRANSPARENT, NULL}
+ };
+
+ int done = FALSE;
+ u32 key;
+ Framebuffer upper;
+ Framebuffer lower;
+
+ while(!done)
+ {
+ int f;
+
+ FB_StartFrame(&upper, &lower);
+
+ FB_Clear(&upper, COL_WHITE);
+ FB_Clear(&lower, COL_BLACK);
+
+ for(f = 0; help[f].text; f++)
+ {
+ FB_Print(&upper, help[f].text, 0, upper.height - f * 8,
+ help[f].col,COL_TRANSPARENT);
+ }
+
+ FB_Print(&lower, "Scroll around help by using the\n"
+ "control pad\n"
+ "Press A to finish.",
+ 0, lower.height - 40, COL_YELLOW,COL_TRANSPARENT);
+
+ FB_EndFrame();
+
+ key = hidKeysDown();
+
+ if (key & KEY_A)
+ {
+ done = TRUE;
+ }
+ }
+}
+
+
/* ---------------------------------------- JOYPAD MAPPING
*/
static void MapJoypad(void)
@@ -246,7 +322,6 @@ int main(int argc, char *argv[])
int quit = FALSE;
gfxInit(GSP_RGB565_OES, GSP_RGB565_OES, false);
- consoleInit(GFX_TOP, NULL);
FB_Init();
@@ -289,7 +364,7 @@ int main(int argc, char *argv[])
Z80Exec(z80);
- ZX81RenderDisplay(&upper);
+ ZX81RenderDisplay(&upper, z80);
FB_EndFrame();
@@ -338,6 +413,10 @@ int main(int argc, char *argv[])
SNAP_Load(z80, NULL, SNAP_TYPE_KEYBOARD);
break;
+ case MenuHelp:
+ ShowHelp();
+ break;
+
case MenuExit:
quit = TRUE;
break;
diff --git a/source/zx81.c b/source/zx81.c
index b2d85b1..1335d0b 100644
--- a/source/zx81.c
+++ b/source/zx81.c
@@ -29,6 +29,7 @@
#include "zx81.h"
#include "gui.h"
+#include "framebuffer.h"
#include "stream.h"
@@ -655,10 +656,164 @@ void ZX81Init(Z80 *z80)
}
-void ZX81RenderDisplay(Framebuffer *fb)
+void ZX81RenderDisplay(Framebuffer *fb, Z80 *z80)
{
- FB_Clear(fb, COL_BLACK);
- FB_Centre(fb, "TODO", 10, COL_WHITE, COL_TRANSPARENT);
+ u16 black;
+ u16 white;
+
+ black = FB_GetColour(COL_BLACK);
+ white = FB_GetColour(COL_WHITE);
+
+ if (fast_mode)
+ {
+ u16 x;
+ u16 y;
+
+ for(x = 0; x < fb->width; x++)
+ {
+ for(y = 0; y < fb->height; y++)
+ {
+ FB_ADDR(fb, x, y) = ((x+y) % 2) ? black : white;
+ }
+ }
+ }
+ else if (hires)
+ {
+ int x;
+ int y;
+ Z80Byte *dfile;
+
+ FB_Clear(fb, COL_WHITE);
+
+ dfile = mem + WORD(DFILE);
+
+ dfile++;
+
+ for(y = 0; y < SCR_H; y++)
+ {
+ for(x = 0; x < TXT_W; x++)
+ {
+ int ch = *dfile++;
+ int px;
+ uint pen;
+ uint paper;
+ int data;
+
+ if (ch == 118)
+ {
+ break;
+ }
+
+ if (ch & 0x80)
+ {
+ pen = white;
+ paper = black;
+ ch -= 0x80;
+ }
+ else
+ {
+ pen = black;
+ paper = white;
+ }
+
+ data = mem[z80->I * 256 + ch * 8];
+
+ for(px = 0; px < 8; px++)
+ {
+ if (data & 0x80)
+ {
+ FB_ADDR(fb,
+ x * 8 + px + 72,
+ fb->height - 24 - y) = pen;
+ }
+ else
+ {
+ FB_ADDR(fb,
+ x * 8 + px + 72,
+ fb->height - 24 - y) = paper;
+ }
+
+ data = data<<1;
+ }
+ }
+
+ if (*dfile == 118)
+ {
+ dfile++;
+ }
+ }
+ }
+ else
+ {
+ int x;
+ int y;
+ Z80Byte *dfile;
+
+ FB_Clear(fb, COL_WHITE);
+
+ dfile = mem + WORD(DFILE);
+
+ dfile++;
+
+ for(y = 0; y < TXT_H; y++)
+ {
+ for(x = 0; x < TXT_W; x++)
+ {
+ int ch = *dfile++;
+ int px;
+ int py;
+ uint pen;
+ uint paper;
+
+ if (ch == 118)
+ {
+ break;
+ }
+
+ if (ch & 0x80)
+ {
+ pen = white;
+ paper = black;
+ ch -= 0x80;
+ }
+ else
+ {
+ pen = black;
+ paper = white;
+ }
+
+ for(py = 0; py < 8; py++)
+ {
+ int data;
+
+ data = mem[z80->I * 256 + ch * 8 + py];
+
+ for(px = 0; px < 8; px++)
+ {
+ if (data & 0x80)
+ {
+ FB_ADDR(fb,
+ x * 8 + px + 72,
+ fb->height - 24 - y * 8 - py) = pen;
+ }
+ else
+ {
+ FB_ADDR(fb,
+ x * 8 + px + 72,
+ fb->height - 24 - y * 8 - py) = paper;
+ }
+
+ data = data<<1;
+ }
+ }
+ }
+
+ if (*dfile == 118)
+ {
+ dfile++;
+ }
+ }
+ }
}
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