From d11d85fe8a27d753305adc5619ff0747b83bb711 Mon Sep 17 00:00:00 2001
From: CrispyPin <crispin@tasa.se>
Date: Thu, 28 Nov 2024 22:19:14 +0100
Subject: [PATCH] zoom slower when texels are larger than pixels

---
 showimage.odin | 29 ++++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/showimage.odin b/showimage.odin
index 16c8c35..647130a 100644
--- a/showimage.odin
+++ b/showimage.odin
@@ -1,6 +1,7 @@
 package showimage
 
 import "core:os"
+import "core:fmt"
 import "core:strings"
 import rl "vendor:raylib"
 
@@ -26,9 +27,18 @@ main :: proc() {
 	for !rl.WindowShouldClose() {
 		scroll := rl.GetMouseWheelMove()
 		if scroll > 0 {
-			change_zoom(zoom)
+			// zoom in
+			if zoom > 1 {
+				change_zoom(1)
+			} else {
+				change_zoom(zoom)
+			}
 		} else if scroll < 0 {
-			change_zoom(-zoom / 2)
+			if zoom > 1 {
+				change_zoom(-1)
+			} else {
+				change_zoom(-zoom / 2)
+			}
 		}
 		if rl.IsMouseButtonDown(rl.MouseButton.LEFT) {
 			offset += rl.GetMouseDelta()
@@ -51,20 +61,21 @@ change_zoom :: proc(delta: f32) {
 	mouse_pos := rl.GetMousePosition()
 	zoom_pos := (mouse_pos - offset) / zoom
 	zoom += delta
+	fmt.printf("zoomed to %f\n", zoom)
 	offset = mouse_pos - zoom_pos * zoom
 }
 
-zoom_to_power :: proc(size: i32, max: i32) -> i32 {
-	fit: i32 = 2
-	for fit * size < max {
-		fit *= 2
+zoom_to_fit :: proc(size: i32, max: i32) -> f32 {
+	if size > max {
+		return 1
 	}
-	return fit / 2
+	return f32(max / size)
 }
 
 reset_zoom :: proc() {
 	zoom = f32(min(
-		zoom_to_power(tex.width, rl.GetRenderWidth()),
-		zoom_to_power(tex.height, rl.GetRenderHeight()),
+		zoom_to_fit(tex.width, rl.GetRenderWidth()),
+		zoom_to_fit(tex.height, rl.GetRenderHeight()),
 	))
+	fmt.printf("zoomed to %f\n",zoom)
 }