Implement VGA_WritePixel for int10 service in CGA mode. This causes many artifacts in older game to render correctly. E.g. the bullets in "Paratrooper".

[Peter Dons Tychsen]

---
 dlls/winedos/int10.c |    9 +++++++--
 dlls/winedos/vga.c   |   31 +++++++++++++++++++++++++++++++
 dlls/winedos/vga.h   |    1 +
 3 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/dlls/winedos/int10.c b/dlls/winedos/int10.c
index 783e575..4765450 100644
--- a/dlls/winedos/int10.c
+++ b/dlls/winedos/int10.c
@@ -1272,8 +1272,13 @@ void WINAPI DOSVM_Int10Handler( CONTEXT86 *context )
         break;
 
     case 0x0c: /* WRITE GRAPHICS PIXEL */
-        /* Not in graphics mode, can ignore w/o error */
-        FIXME("Write Graphics Pixel - Not Supported\n");
+       
+        /* Only supported in CGA mode for now */ 
+        if(data->VideoMode >= 4 && data->VideoMode <= 6)
+        {
+          VGA_WritePixel(AL_reg(context), BH_reg(context), CX_reg(context), DX_reg(context));
+        }
+        else FIXME("Write pixel not implemented for current mode\n");
         break;
 
     case 0x0d: /* READ GRAPHICS PIXEL */
diff --git a/dlls/winedos/vga.c b/dlls/winedos/vga.c
index 772c06e..6d19350 100644
--- a/dlls/winedos/vga.c
+++ b/dlls/winedos/vga.c
@@ -1083,6 +1083,37 @@ void VGA_SetPaletteIndex(unsigned index)
   vga_fb_palette_index = index;
 }
 
+/**********************************************************************
+ *         VGA_WritePixel
+ *
+ * Write data to the framebuffer
+ * This is a property of the CGA controller, but might be supported
+ * later by other framebuffer types
+ */
+void VGA_WritePixel(unsigned color, unsigned page, unsigned col, unsigned row)
+{
+  int off;
+  int bits;
+  int pos;
+  
+  /* Calculate CGA byte offset */
+  char *data = vga_fb_window_data;
+  off = row & 1 ? (8 * 1024) : 0;
+  off += (80 * (row/2));
+  off += col/4;
+
+  /* Calculate bits offset */
+  pos = 6 - (col%4 * 2);
+
+  /* Clear current data */
+  bits = 0x03 << pos;
+  data[off] &= ~bits;
+
+  /* Set new data */
+  bits = color << pos;
+  data[off] |= bits;
+}
+
 /*** TEXT MODE ***/
 
 /* prepare the text mode video memory copy that is used to only
diff --git a/dlls/winedos/vga.h b/dlls/winedos/vga.h
index 60444a9..10f5c49 100644
--- a/dlls/winedos/vga.h
+++ b/dlls/winedos/vga.h
@@ -42,6 +42,7 @@ void VGA_ShowMouse(BOOL show);
 void VGA_UpdatePalette(void);
 void VGA_SetPaletteIndex(unsigned index);
 void VGA_SetBright(BOOL bright);
+void VGA_WritePixel(unsigned color, unsigned page, unsigned col, unsigned row);
 
 /* text mode */
 void VGA_InitAlphaMode(unsigned*Xres,unsigned*Yres);
-- 
1.5.4.3


--=-ogruyErNGJimmcBj7co3--