From 8df7d4d1feb782fc54b79776b5ee7238d357e521 Mon Sep 17 00:00:00 2001
From: Robert Lowe <robert.lowe@maryvillecollege.edu>
Date: Mon, 19 Jan 2015 22:15:02 -0500
Subject: [PATCH] starting code for drawing planar buffers

---
 planarNotes.txt   | 26 ++++++++++++++++++++++++++
 src/lib/modex16.c |  6 ++++++
 src/lib/modex16.h |  6 ++++--
 3 files changed, 36 insertions(+), 2 deletions(-)
 create mode 100644 planarNotes.txt

diff --git a/planarNotes.txt b/planarNotes.txt
new file mode 100644
index 00000000..f9293930
--- /dev/null
+++ b/planarNotes.txt
@@ -0,0 +1,26 @@
+The first case to consider is that where the image width is divisible
+by 4.  This case is shown below:
+
+Planar Format     Normal Raster order
+============= 	  ===================
+0 0 1 2 3      	  PI
+  4 5 6 7	  00 10 20 30 01 11 21 31 02 12 22 32 03 13 23 33
+  8 9 A B         04 14 24 34 05 15 25 35 06 16 26 36 07 17 27 37
+       	       	  08 18 28 38 09 19 29 39 0A 1A 2A 3A 0B 1B 2B 3B
+1 0 1 2 3
+  4 5 6 7
+  8 9 A B
+
+2 0 1 2 3
+  4 5 6 7
+  8 9 A B
+
+3 0 1 2 3
+  4 5 6 7
+  8 9 A B
+
+Suppose we would like to render the image from (1,0) to (3,1), we
+would render the coordinates:
+
+  10 20 30
+  14 24 34
diff --git a/src/lib/modex16.c b/src/lib/modex16.c
index bde6b1fe..0137b625 100644
--- a/src/lib/modex16.c
+++ b/src/lib/modex16.c
@@ -286,6 +286,12 @@ modexDrawBmpRegion(page_t *page, int x, int y,
 }
 
 
+void
+modexDrawPlanarBuf(page_t *page, int x, int y, planar_buf_t *bmp) {
+    /* TODO - adapt from test code */
+}
+
+
 void
 modexDrawSprite(page_t *page, int x, int y, bitmap_t *bmp) {
     /* draw the whole sprite */
diff --git a/src/lib/modex16.h b/src/lib/modex16.h
index 1a5debdf..7cb27820 100644
--- a/src/lib/modex16.h
+++ b/src/lib/modex16.h
@@ -6,6 +6,7 @@
 #include <conio.h>
 #include "src\lib\types.h"
 #include "src\lib\bitmap.h"
+#include "src\lib\planar.h"
 
 /* -========================== Types & Macros ==========================- */
 #define PAGE_OFFSET(x,y) (((y)<<6)+((y)<<4)+((x)>>2))
@@ -29,11 +30,12 @@ page_t modexNextPage(page_t *p);
 void modexShowPage(page_t *page);
 void modexPanPage(page_t *page, int dx, int dy);
 void modexSelectPlane(byte plane);
-void modexClearRegion(page_t *page, int x, int y, int w, int h, byte color);
+void modexClearRegion(page_t *page, int x, int y, int w, int h, byte color);
 void modexDrawBmp(page_t *page, int x, int y, bitmap_t *bmp);
 void modexDrawBmpRegion(page_t *page, int x, int y, int rx, int ry, int rw, int rh, bitmap_t *bmp);
+void modexDrawPlanarBuf(page_t *page, int x, int y, planar_buf_t *bmp);
 void modexDrawSprite(page_t *page, int x, int y, bitmap_t *bmp);
-void modexDrawSpriteRegion(page_t *page, int x, int y, int rx, int ry, int rw, int rh, bitmap_t *bmp);
+void modexDrawSpriteRegion(page_t *page, int x, int y, int rx, int ry, int rw, int rh, bitmap_t *bmp);
 void modexCopyPageRegion(page_t *dest, page_t *src, word sx, word sy, word dx, word dy, word width, word height);
 
 /* Palette fade and flash effects */
-- 
2.39.2