From 37dd208d38ab9f65f9e15fd7fe2f0b75bc83220a Mon Sep 17 00:00:00 2001
From: bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Thu, 21 Sep 2006 21:46:53 +0000
Subject: [PATCH] VBE: 8 bit DACs + support for VBE BIOS IDs (Volker Ruppert)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2163 c046a42c-6fe2-441c-8c8c-71466251a162
---
 hw/vga.c     | 17 +++++++++++++----
 hw/vga_int.h |  3 +++
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/hw/vga.c b/hw/vga.c
index 4ecb7a95cf..0609f84ccd 100644
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -422,7 +422,9 @@ static void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val)
         case VBE_DISPI_INDEX_ID:
             if (val == VBE_DISPI_ID0 ||
                 val == VBE_DISPI_ID1 ||
-                val == VBE_DISPI_ID2) {
+                val == VBE_DISPI_ID2 ||
+                val == VBE_DISPI_ID3 ||
+                val == VBE_DISPI_ID4) {
                 s->vbe_regs[s->vbe_index] = val;
             }
             break;
@@ -505,6 +507,7 @@ static void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val)
                 /* XXX: the bios should do that */
                 s->bank_offset = 0;
             }
+            s->dac_8bit = (val & VBE_DISPI_8BIT_DAC) > 0;
             s->vbe_regs[s->vbe_index] = val;
             break;
         case VBE_DISPI_INDEX_VIRT_WIDTH:
@@ -921,9 +924,15 @@ static int update_palette256(VGAState *s)
     palette = s->last_palette;
     v = 0;
     for(i = 0; i < 256; i++) {
-        col = s->rgb_to_pixel(c6_to_8(s->palette[v]), 
-                              c6_to_8(s->palette[v + 1]), 
-                              c6_to_8(s->palette[v + 2]));
+        if (s->dac_8bit) {
+          col = s->rgb_to_pixel(s->palette[v], 
+                                s->palette[v + 1], 
+                                s->palette[v + 2]);
+        } else {
+          col = s->rgb_to_pixel(c6_to_8(s->palette[v]), 
+                                c6_to_8(s->palette[v + 1]), 
+                                c6_to_8(s->palette[v + 2]));
+        }
         if (col != palette[i]) {
             full_update = 1;
             palette[i] = col;
diff --git a/hw/vga_int.h b/hw/vga_int.h
index 70127768a4..633f344c73 100644
--- a/hw/vga_int.h
+++ b/hw/vga_int.h
@@ -49,6 +49,8 @@
 #define VBE_DISPI_ID0                   0xB0C0
 #define VBE_DISPI_ID1                   0xB0C1
 #define VBE_DISPI_ID2                   0xB0C2
+#define VBE_DISPI_ID3                   0xB0C3
+#define VBE_DISPI_ID4                   0xB0C4
   
 #define VBE_DISPI_DISABLED              0x00
 #define VBE_DISPI_ENABLED               0x01
@@ -103,6 +105,7 @@
     uint8_t dac_read_index;                                             \
     uint8_t dac_write_index;                                            \
     uint8_t dac_cache[3]; /* used when writing */                       \
+    int dac_8bit;                                                       \
     uint8_t palette[768];                                               \
     int32_t bank_offset;                                                \
     int (*get_bpp)(struct VGAState *s);                                 \