From 61527f3e64af48b77c8213f1fc9a99ad401bebc3 Mon Sep 17 00:00:00 2001
From: Simon Forman <sforman@hushmail.com>
Date: Sun, 26 Feb 2023 21:02:57 -0800
Subject: [PATCH] Cicada bg, needs work.

Not as pretty as I'd hoped.

Putting a pin in Wu lines for tonight.  I'll lick it in the morning when
I'm fresh.
---
 implementations/uvm-ncc/graphics.h | 29 +++++++++++++++++++++++++++++
 implementations/uvm-ncc/xerblin.c  |  6 +++---
 2 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/implementations/uvm-ncc/graphics.h b/implementations/uvm-ncc/graphics.h
index f747b21..b398b78 100644
--- a/implementations/uvm-ncc/graphics.h
+++ b/implementations/uvm-ncc/graphics.h
@@ -19,6 +19,35 @@ draw_background(u32* buffer, size_t w, size_t h)
 	}
 }
 
+void
+draw_cicada_bars_background(u32* buffer, size_t w, size_t h)
+{
+	for (size_t x = 0; x < w; ++x) {
+		for (size_t y = 0; y < h; ++y) {
+			u8 blue  = 5*x%17 + 127;
+			u8 green = 5*x%37 + 127;
+			u8 red   = 5*x%43 + 127;
+			u32* pix_ptr = buffer + w * y + x;
+			*pix_ptr = (red << 16) | (green << 8) | blue;
+		}
+	}
+}
+
+
+void
+draw_cicada_bars_background0(u32* buffer, size_t w, size_t h)
+{
+	for (size_t x = 0; x < w; ++x) {
+		for (size_t y = 0; y < h; ++y) {
+			u8 blue  = !((5*x / 17) & 1) ? 100 : 0;
+			u8 green = !((5*x / 37) & 1) ? 100 : 0;
+			u8 red   = !((5*x / 43) & 1) ? 100 : 0;
+			u32* pix_ptr = buffer + w * y + x;
+			*pix_ptr = (red << 16) | (green << 8) | blue;
+		}
+	}
+}
+
 void
 carefree_alpha_blend_blit(u32* dest, u32* source, size_t dest_stride, u64 dest_x, u64 dest_y, u64 w, u64 h)
 {
diff --git a/implementations/uvm-ncc/xerblin.c b/implementations/uvm-ncc/xerblin.c
index 9a862bf..edae59d 100644
--- a/implementations/uvm-ncc/xerblin.c
+++ b/implementations/uvm-ncc/xerblin.c
@@ -106,9 +106,9 @@ main()
 	carefree_draw_box(frame_buffer, FRAME_WIDTH, 126, 126, w, h, WHITE);
 	w = 200;
 	//carefree_wu_line(frame_buffer, FRAME_WIDTH, 10, 256, 200, 100, WHITE);
-	for (w = 101; w < (FRAME_WIDTH - 10); w = w + 50) {
-		carefree_wu_line(frame_buffer, FRAME_WIDTH, 10, 256, w, 100, WHITE);
-	}
+	//for (w = 101; w < (FRAME_WIDTH - 10); w = w + 50) {
+	//	carefree_wu_line(frame_buffer, FRAME_WIDTH, 10, 256, w, 100, WHITE);
+	//}
 	window_draw_frame(wid, frame_buffer);
 	window_on_keydown(wid, keydown);
 	window_on_mousedown(wid, mousedown);