vga: Respect Line Compare Register in text modes

Unbreaks setup screen of Act1/PL

Signed-off-by: malc <av1474@comtv.ru>

1 files changed, 13 insertions, 5 deletions

diff --git a/hw/vga.c b/hw/vga.c
index 95a7650f3c..5d09037811 100644
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -1267,9 +1267,9 @@ static rgb_to_pixel_dup_func *rgb_to_pixel_dup_table[NB_DEPTHS] = {
 static void vga_draw_text(VGACommonState *s, int full_update)
 {
     int cx, cy, cheight, cw, ch, cattr, height, width, ch_attr;
-    int cx_min, cx_max, linesize, x_incr;
+    int cx_min, cx_max, linesize, x_incr, line;
     uint32_t offset, fgcol, bgcol, v, cursor_offset;
-    uint8_t *d1, *d, *src, *s1, *dest, *cursor_ptr;
+    uint8_t *d1, *d, *src, *dest, *cursor_ptr;
     const uint8_t *font_ptr, *font_base[2];
     int dup9, line_offset, depth_index;
     uint32_t *palette;
@@ -1301,7 +1301,6 @@ static void vga_draw_text(VGACommonState *s, int full_update)
     full_update |= update_basic_params(s);
 
     line_offset = s->line_offset;
-    s1 = s->vram_ptr + (s->start_addr * 4);
 
     vga_get_text_resolution(s, &width, &height, &cw, &cheight);
     x_incr = cw * ((ds_get_bits_per_pixel(s->ds) + 7) >> 3);
@@ -1354,9 +1353,11 @@ static void vga_draw_text(VGACommonState *s, int full_update)
     dest = ds_get_data(s->ds);
     linesize = ds_get_linesize(s->ds);
     ch_attr_ptr = s->last_ch_attr;
+    line = 0;
+    offset = s->start_addr * 4;
     for(cy = 0; cy < height; cy++) {
         d1 = dest;
-        src = s1;
+        src = s->vram_ptr + offset;
         cx_min = width;
         cx_max = -1;
         for(cx = 0; cx < width; cx++) {
@@ -1419,7 +1420,14 @@ static void vga_draw_text(VGACommonState *s, int full_update)
                        (cx_max - cx_min + 1) * cw, cheight);
         }
         dest += linesize * cheight;
-        s1 += line_offset;
+        if (line >= s->line_compare) {
+            line -= s->line_compare;
+            offset = 0;
+        }
+        else {
+            offset += line_offset;
+            line += cheight;
+        }
     }
 }