From c7fd12ca4cd5b98846bf9635d96de9b04b48a0ee Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Wed, 12 Oct 2022 14:05:45 +0200
Subject: [WIP] Add pixel perfect zoom to the PPU

---
 src/main.c | 18 +++++++++---------
 src/ppu.c  | 10 +++++++++-
 2 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/src/main.c b/src/main.c
index cdc8530..8792a9a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -120,10 +120,17 @@ poll_mouse(void) {
             printf("MOUSE REL EVENT\n");
             if (mouse_event.code == REL_X) {
                 in.mouse.x = CLAMP(
-                    in.mouse.x + (s32)mouse_event.value, 0, (s32)screen_width);
+                    in.mouse.x / zoom + (s32)mouse_event.value, 0, (s32)screen_width);
             } else  if (mouse_event.code == REL_Y) {
                 in.mouse.y = CLAMP(
-                    in.mouse.y + (s32)mouse_event.value, 0, (s32)screen_height);
+                    in.mouse.y / zoom + (s32)mouse_event.value, 0, (s32)screen_height);
+            }
+        } else if (mouse_event.type == EV_ABS) {
+            printf("MOUSE ABS EVENT\n");
+            if (mouse_event.code == ABS_X) {
+                in.mouse.x = CLAMP((s32)mouse_event.value / zoom, 0, (s32)screen_width);
+            } else  if (mouse_event.code == ABS_Y) {
+                in.mouse.y = CLAMP((s32)mouse_event.value / zoom, 0, (s32)screen_height);
             }
         } else if (mouse_event.type == EV_KEY) {
             printf("MOUSE KEY EVENT\n");
@@ -144,13 +151,6 @@ poll_mouse(void) {
                 } break;
                 default: break;
             }
-        } else if (mouse_event.type == EV_ABS) {
-            printf("MOUSE ABS EVENT\n");
-            if (mouse_event.code == ABS_X) {
-                in.mouse.x = CLAMP((s32)mouse_event.value, 0, (s32)screen_width);
-            } else  if (mouse_event.code == ABS_Y) {
-                in.mouse.y = CLAMP((s32)mouse_event.value, 0, (s32)screen_height);
-            }
         }
         in.mouse.update = true;
     }
diff --git a/src/ppu.c b/src/ppu.c
index 3afa533..38b27e6 100644
--- a/src/ppu.c
+++ b/src/ppu.c
@@ -27,6 +27,7 @@ static size_t screen_height = 0;
 static size_t bpp = 0;
 static int fb_file = 0;
 static int refresh_file = 0;
+static int zoom = 2;
 
 static u8 *framebuffer = 0;
 
@@ -175,6 +176,8 @@ ppu_init(void) {
         fprintf(stderr, "error: couldn't mmap the framebuffer\n");
         exit(EXIT_FAILURE);
     }
+    screen_width /= zoom;
+    screen_height /= zoom;
 
     // Allocate intermediate buffers.
     pixels_fg = malloc(screen_width * screen_height);
@@ -222,7 +225,12 @@ blit_framebuffer(void) {
                 size_t idx = i + j * screen_width;
                 if (bpp == 16) {
                     u16 *p = framebuffer;
-                    p[idx] = rgb565(palette[pixels_fg[idx] << 2 | pixels_bg[idx]]);
+                    for (size_t zz = 0; zz < zoom; zz++) {
+                        size_t fb_idx = (i * zoom + j * screen_width * zoom * zoom + zz * screen_width * zoom);
+                        for (size_t z = 0; z < zoom; z++) {
+                            p[fb_idx + z] = rgb565(palette[pixels_fg[idx] << 2 | pixels_bg[idx]]);
+                        }
+                    }
                 } else if (bpp == 32) {
                     u32 *p = framebuffer;
                     p[idx] = palette[pixels_fg[idx] << 2 | pixels_bg[idx]];
-- 
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