Fix a bug with flickering

2 files changed, 9 insertions, 21 deletions

diff --git a/src/main.c b/src/main.c
index 129493b..8d88b83 100644
--- a/src/main.c
+++ b/src/main.c
@@ -144,11 +144,10 @@ int main(void) {
         //     inc = 1;
         // }
 
-        // draw_rect(50, 10, 200, 110, 1);
-        // PROF(test_rect(), test_rect_cycles);
-        // PROF(test_fill_rect(), test_fill_rect_cycles);
-        // PROF(test_chr(), test_chr_cycles);
-        // PROF(test_icn(), test_icn_cycles);
+        PROF(test_rect(), test_rect_cycles);
+        PROF(test_fill_rect(), test_fill_rect_cycles);
+        PROF(test_chr(), test_chr_cycles);
+        PROF(test_icn(), test_icn_cycles);
         draw_filled_rect(0, 0, 140, 60, 0);
         PROF_SHOW();
         PROF(flip_buffer(), flip_cycles);
diff --git a/src/renderer_m0.c b/src/renderer_m0.c
index 3d1a4d0..1d28fb9 100644
--- a/src/renderer_m0.c
+++ b/src/renderer_m0.c
@@ -448,12 +448,12 @@ flip_buffer(void) {
     if (backbuf == BUF_0) {
         backbuf = BUF_1;
         BG_H_SCROLL_0 = 0;
-        BG_H_SCROLL_1 = 240;
+        BG_H_SCROLL_1 = -240;
         BG_CTRL(0) = BG_CHARBLOCK(CB_0) | BG_SCREENBLOCK(SB_0) | BG_PRIORITY(0) | BG_SIZE(1);
         BG_CTRL(1) = BG_CHARBLOCK(CB_1) | BG_SCREENBLOCK(SB_1) | BG_PRIORITY(2) | BG_SIZE(1);
     } else {
         backbuf = BUF_0;
-        BG_H_SCROLL_0 = 240;
+        BG_H_SCROLL_0 = -240;
         BG_H_SCROLL_1 = 0;
         BG_CTRL(0) = BG_CHARBLOCK(CB_0) | BG_SCREENBLOCK(SB_0) | BG_PRIORITY(2) | BG_SIZE(1);
         BG_CTRL(1) = BG_CHARBLOCK(CB_1) | BG_SCREENBLOCK(SB_1) | BG_PRIORITY(0) | BG_SIZE(1);
@@ -645,23 +645,12 @@ renderer_init(void) {
         mem_map_fg[i] = i;
         mem_map_fg_blank[i] = 32 * 20 - 1;
         mem_map_bg[i] = i + 32 * 4;
-        mem_map_bg_blank[i] = 32 * 20 - 1;
+        mem_map_bg_blank[i] = (32 * 20 - 1) +  32 * 4;
     }
 
     // Setup initial background state.
-    BG_H_SCROLL_0 = 240;
-    BG_H_SCROLL_1 = 240;
-
-    // FIXME: clean this up.
-    // u32 *clr_tile =((u32*)(MEM_VRAM) + 0xC000 / 4);
-    // clr_tile[0] = 0x22222222;
-    // clr_tile[1] = 0x22222222;
-    // clr_tile[2] = 0x22222222;
-    // clr_tile[3] = 0x22222222;
-    // clr_tile[4] = 0x22222222;
-    // clr_tile[5] = 0x22222222;
-    // clr_tile[6] = 0x22222222;
-    // clr_tile[7] = 0x22222222;
+    BG_H_SCROLL_0 = -240;
+    BG_H_SCROLL_1 = -240;
 
     // Initialize default palette.
     PAL_BUFFER_BG[0] = COLOR_BLACK;