From 1df37c2440e2675efd4454f4e72b88f051bdafa4 Mon Sep 17 00:00:00 2001
From: TC1995 <mariogplayer90@gmail.com>
Date: Sat, 16 Dec 2023 20:21:57 +0100
Subject: [PATCH] Temporarily added the older 8bpp highres render for the
 Matrox Millennium.

---
 src/include/86box/vid_svga_render.h |  1 +
 src/video/vid_svga_render.c         | 83 +++++++++++++++++++++++++++++
 2 files changed, 84 insertions(+)

diff --git a/src/include/86box/vid_svga_render.h b/src/include/86box/vid_svga_render.h
index bc6894ca9..33bb13bbf 100644
--- a/src/include/86box/vid_svga_render.h
+++ b/src/include/86box/vid_svga_render.h
@@ -53,6 +53,7 @@ extern void svga_render_4bpp_lowres(svga_t *svga);
 extern void svga_render_4bpp_highres(svga_t *svga);
 extern void svga_render_8bpp_lowres(svga_t *svga);
 extern void svga_render_8bpp_highres(svga_t *svga);
+extern void svga_render_8bpp_incompatible_highres(svga_t *svga);
 extern void svga_render_8bpp_tseng_lowres(svga_t *svga);
 extern void svga_render_8bpp_tseng_highres(svga_t *svga);
 extern void svga_render_8bpp_gs_lowres(svga_t *svga);
diff --git a/src/video/vid_svga_render.c b/src/video/vid_svga_render.c
index 7cc0aafc3..f7bc36130 100644
--- a/src/video/vid_svga_render.c
+++ b/src/video/vid_svga_render.c
@@ -665,6 +665,89 @@ void svga_render_4bpp_highres(svga_t *svga) { svga_render_indexed_gfx(svga, true
 void svga_render_8bpp_lowres(svga_t *svga) { svga_render_indexed_gfx(svga, false, true); }
 void svga_render_8bpp_highres(svga_t *svga) { svga_render_indexed_gfx(svga, true, true); }
 
+void
+svga_render_8bpp_incompatible_highres(svga_t *svga)
+{
+    int       x;
+    uint32_t *p;
+    uint32_t  dat;
+    uint32_t  changed_addr;
+    uint32_t  addr;
+
+    if ((svga->displine + svga->y_add) < 0)
+        return;
+
+    if (svga->force_old_addr) {
+        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange) {
+            p = &svga->monitor->target_buffer->line[svga->displine + svga->y_add][svga->x_add];
+
+            if (svga->firstline_draw == 2000)
+                svga->firstline_draw = svga->displine;
+            svga->lastline_draw = svga->displine;
+
+            for (x = 0; x <= (svga->hdisp /* + svga->scrollcache*/); x += 8) {
+                dat  = *(uint32_t *) (&svga->vram[svga->ma & svga->vram_display_mask]);
+                p[0] = svga->map8[dat & 0xff];
+                p[1] = svga->map8[(dat >> 8) & 0xff];
+                p[2] = svga->map8[(dat >> 16) & 0xff];
+                p[3] = svga->map8[(dat >> 24) & 0xff];
+
+                dat  = *(uint32_t *) (&svga->vram[(svga->ma + 4) & svga->vram_display_mask]);
+                p[4] = svga->map8[dat & 0xff];
+                p[5] = svga->map8[(dat >> 8) & 0xff];
+                p[6] = svga->map8[(dat >> 16) & 0xff];
+                p[7] = svga->map8[(dat >> 24) & 0xff];
+
+                svga->ma += 8;
+                p += 8;
+            }
+            svga->ma &= svga->vram_display_mask;
+        }
+    } else {
+        changed_addr = svga->remap_func(svga, svga->ma);
+
+        if (svga->changedvram[changed_addr >> 12] || svga->changedvram[(changed_addr >> 12) + 1] || svga->fullchange) {
+            p = &svga->monitor->target_buffer->line[svga->displine + svga->y_add][svga->x_add];
+
+            if (svga->firstline_draw == 2000)
+                svga->firstline_draw = svga->displine;
+            svga->lastline_draw = svga->displine;
+
+            if (!svga->remap_required) {
+                for (x = 0; x <= (svga->hdisp /* + svga->scrollcache*/); x += 8) {
+                    dat  = *(uint32_t *) (&svga->vram[svga->ma & svga->vram_display_mask]);
+                    p[0] = svga->map8[dat & 0xff];
+                    p[1] = svga->map8[(dat >> 8) & 0xff];
+                    p[2] = svga->map8[(dat >> 16) & 0xff];
+                    p[3] = svga->map8[(dat >> 24) & 0xff];
+
+                    dat  = *(uint32_t *) (&svga->vram[(svga->ma + 4) & svga->vram_display_mask]);
+                    p[4] = svga->map8[dat & 0xff];
+                    p[5] = svga->map8[(dat >> 8) & 0xff];
+                    p[6] = svga->map8[(dat >> 16) & 0xff];
+                    p[7] = svga->map8[(dat >> 24) & 0xff];
+
+                    svga->ma += 8;
+                    p += 8;
+                }
+            } else {
+                for (x = 0; x <= (svga->hdisp /* + svga->scrollcache*/); x += 4) {
+                    addr = svga->remap_func(svga, svga->ma);
+                    dat  = *(uint32_t *) (&svga->vram[addr & svga->vram_display_mask]);
+                    p[0] = svga->map8[dat & 0xff];
+                    p[1] = svga->map8[(dat >> 8) & 0xff];
+                    p[2] = svga->map8[(dat >> 16) & 0xff];
+                    p[3] = svga->map8[(dat >> 24) & 0xff];
+
+                    svga->ma += 4;
+                    p += 4;
+                }
+            }
+            svga->ma &= svga->vram_display_mask;
+        }
+    }
+}
+
 // TODO: Integrate more of this into the generic paletted renderer --GM
 #if 0
 void