From c9d5551c24b742b9704da409ce349ae93ded802e Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Sat, 17 Apr 2021 12:32:25 +0200
Subject: Rename DISP_CONTROL to DISP_CTRL

---
 Makefile   |  2 +-
 src/main.c | 43 +++++++++++++++++++++++++++++++++++++------
 2 files changed, 38 insertions(+), 7 deletions(-)

diff --git a/Makefile b/Makefile
index fbd5fe3..ae1e158 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ WATCH_SRC      := $(wildcard $(SRC_DIR)/*.c)
 WATCH_SRC      += $(wildcard $(SRC_DIR)/*.h)
 
 # Output library names and executables.
-TARGET         := first
+TARGET         := experiments
 BUILD_DIR      := build
 ELF            := $(BUILD_DIR)/$(TARGET).elf
 BIN            := $(BUILD_DIR)/$(TARGET).gba
diff --git a/src/main.c b/src/main.c
index f684530..2a445de 100644
--- a/src/main.c
+++ b/src/main.c
@@ -21,12 +21,12 @@
 //
 
 // Display registers.
-#define DISP_CONTROL *((vu32*)(MEM_IO + 0x0000))
-#define DISP_STATUS  *((vu32*)(MEM_IO + 0x0004))
-#define DISP_VCOUNT  *((vu32*)(MEM_IO + 0x0006))
+#define DISP_CTRL   *((vu32*)(MEM_IO + 0x0000))
+#define DISP_STATUS *((vu32*)(MEM_IO + 0x0004))
+#define DISP_VCOUNT *((vu32*)(MEM_IO + 0x0006))
 
 // Bits for display control.
-#define DISP_CONTROL_PAGE (1 << 4)
+#define DISP_CTRL_PAGE (1 << 4)
 
 // Display modes.
 #define DISP_MODE_0 0x0000
@@ -255,7 +255,7 @@ draw_fill_rect_m4(int x0, int y0, int x1, int y1, u8 col_index, vu16 *buffer) {
 
 static inline void
 flip_page() {
-    DISP_CONTROL ^= DISP_CONTROL_PAGE;
+    DISP_CTRL ^= DISP_CTRL_PAGE;
 }
 
 #define SCREEN_PAGE_1 ((vu16*) MEM_VRAM)
@@ -352,10 +352,41 @@ key_hold(u32 key) {
 #define KEY_PRESSED(key) (~(KEY_INPUTS) & key)
 
 int main(void) {
-    DISP_CONTROL = DISP_MODE_3 | DISP_BG_2;
+    DISP_CTRL = DISP_MODE_3 | DISP_BG_2;
 
     draw_fill_rect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, COLOR_GREY);
 
+    int side = 60;
+    int line = 35;
+    int height = side * 0.5;
+    int x = SCREEN_WIDTH / 2 - height / 2;
+    int y = SCREEN_HEIGHT / 2;
+
+    // Draw red triangle.
+    draw_line(x + height - 1, y - side / 2, x, y - 1, COLOR_RED);
+    draw_line(x + height - 1, y + side / 2, x, y + 1, COLOR_RED);
+    draw_line(x + height - 1, y - side / 2 + 1, x, y, COLOR_RED);
+    draw_line(x + height - 1, y + side / 2 - 1, x, y, COLOR_RED);
+
+    // Draw white triangle.
+    draw_line(x, y - side / 2, x, y + side / 2, COLOR_WHITE);
+    draw_line(x + 1, y - side / 2, x + height, y - 1, COLOR_WHITE);
+    draw_line(x + 1, y + side / 2, x + height, y + 1, COLOR_WHITE);
+
+    // Draw white line at triangle tip.
+    draw_line(x + height, y - side / 2, x + height, y + side / 2, COLOR_WHITE);
+    draw_line(x + height + 1, y - side / 2, x + height + 1, y + side / 2, COLOR_WHITE);
+
+    // Double triangle line.
+    draw_line(x - 1, y - side / 2, x - 1, y + side / 2, COLOR_WHITE);
+    draw_line(x + 1, y - side / 2 + 1, x + height, y, COLOR_WHITE);
+    draw_line(x + 1, y + side / 2 - 1, x + height, y, COLOR_WHITE);
+
+    // Draw white lines.
+    draw_line(x - line, y, x, y, COLOR_WHITE);
+    draw_line(x + height, y, x + height + line, y, COLOR_WHITE);
+    draw_line(x - line, y + 1, x, y + 1, COLOR_WHITE);
+    draw_line(x + height, y + 1, x + height + line, y + 1, COLOR_WHITE);
     int frame_counter = 0;
     bool toggle_key_down = false;
     while(true) {
-- 
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