From 2fc29f20a343504780125aa2bed048cece79a37b Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Thu, 4 May 2023 12:44:03 +0100
Subject: Update the full fb once to sync with RAM

This is after loading the programm.
---
 tr8vm.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'tr8vm.c')

diff --git a/tr8vm.c b/tr8vm.c
index 941e207..d4adb67 100644
--- a/tr8vm.c
+++ b/tr8vm.c
@@ -94,6 +94,12 @@ static uint32_t palette[] =
 uint8_t ram[UINT16_MAX + 1] = { 0 };
 uint32_t *fb_data = NULL;
 
+static void update_fb()
+{
+    for (uint16_t addr = 0; addr < 16384; addr++)
+        fb_data[addr] = palette[ram[VIDEO_RAM + addr] & 15];
+}
+
 void write_m(uint16_t addr, uint8_t b)
 {
     if (addr >= VIDEO_RAM && addr < (VIDEO_RAM + 16384))
@@ -186,6 +192,13 @@ int main(int argc, char *argv[])
     int pitch = 0;
     uint8_t rc;
 
+    /* update full fb once to sync with RAM */
+    pitch = 0;
+    fb_data = NULL;
+    SDL_LockTexture(fb, NULL, (void **)&fb_data, &pitch);
+    update_fb();
+    SDL_UnlockTexture(fb);
+
     SDL_Event ev;
     while (1)
     {
-- 
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