Initial version of EFI framebuffer module, currently support only GOP

2023-01-16 18:41:25 +01:00
parent 289316b43b
commit 605597262c
8 changed files with 446 additions and 0 deletions
--- a/xtldr/modules/framebuf/gop.c
+++ b/xtldr/modules/framebuf/gop.c
@@ -0,0 +1,51 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtldr/modules/framebuf/gop.c
+ * DESCRIPTION:     Graphical Output Protocol (GOP) support
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#include <framebuf.h>
+
+
+/**
+ * Returns a number of bits per pixel (BPP) in the current video mode.
+ *
+ * @return A number of bits per pixel.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+UINT32
+GoppGetBitsPerPixel()
+{
+    UINT32 BitsPerPixel, CompoundMask;
+
+    switch(FrameBufferInfo.Adapter.GOP->Mode->Info->PixelFormat)
+    {
+        case PixelBlueGreenRedReserved8BitPerColor:
+        case PixelRedGreenBlueReserved8BitPerColor:
+        case PixelBltOnly:
+            BitsPerPixel = 32;
+            break;
+        case PixelBitMask:
+            BitsPerPixel = 32;
+            CompoundMask = FrameBufferInfo.Adapter.GOP->Mode->Info->PixelInformation.RedMask |
+                           FrameBufferInfo.Adapter.GOP->Mode->Info->PixelInformation.GreenMask |
+                           FrameBufferInfo.Adapter.GOP->Mode->Info->PixelInformation.BlueMask |
+                           FrameBufferInfo.Adapter.GOP->Mode->Info->PixelInformation.ReservedMask;
+            while((CompoundMask & (1 << 31)) == 0)
+            {
+                BitsPerPixel--;
+                CompoundMask <<= 1;
+            }
+            break;
+        default:
+            BitsPerPixel = 0;
+            break;
+    }
+
+    /* Return bpp */
+    return BitsPerPixel;
+}