From b62b9e853db8b71470355981330e982eb64a032c Mon Sep 17 00:00:00 2001
From: mix <mixiate@proton.me>
Date: Thu, 14 Aug 2025 14:36:46 +0100
Subject: [PATCH] Fix #24151: Change OpenGL shader gl_FragCoord use to not
 require layout

---
 data/shaders/drawrect.frag | 6 ++++--
 data/shaders/drawrect.vert | 3 +++
 distribution/changelog.txt | 1 +
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/data/shaders/drawrect.frag b/data/shaders/drawrect.frag
index d9e5a95be3..c90aa727db 100644
--- a/data/shaders/drawrect.frag
+++ b/data/shaders/drawrect.frag
@@ -13,7 +13,7 @@ uniform usampler2D      uPaletteTex;
 uniform sampler2D       uPeelingTex;
 uniform bool            uPeeling;
 
-layout(origin_upper_left, pixel_center_integer) in vec4 gl_FragCoord;
+in vec4 gl_FragCoord;
 
 flat in int             fFlags;
 flat in uint            fColour;
@@ -26,6 +26,7 @@ in vec3                 fPeelPos;
 flat in float           fZoom;
 flat in int             fTexColourAtlas;
 flat in int             fTexMaskAtlas;
+flat in int             fScreenHeight;
 // clang-format on
 
 out uint oColour;
@@ -41,7 +42,8 @@ void main()
         }
     }
 
-    vec2 position = (gl_FragCoord.xy - fPosition) * fZoom;
+    vec2 fragCoord = vec2(floor(gl_FragCoord.x), fScreenHeight - floor(gl_FragCoord.y) - 1);
+    vec2 position = (fragCoord - fPosition) * fZoom;
 
     uint texel;
     if ((fFlags & FLAG_NO_TEXTURE) == 0)
diff --git a/data/shaders/drawrect.vert b/data/shaders/drawrect.vert
index 6dc325b9dd..1f346523b4 100644
--- a/data/shaders/drawrect.vert
+++ b/data/shaders/drawrect.vert
@@ -31,6 +31,7 @@ flat out vec3  fPalettes;
 flat out float fZoom;
 flat out int   fTexColourAtlas;
 flat out int   fTexMaskAtlas;
+flat out int   fScreenHeight;
 // clang-format on
 
 void main()
@@ -57,6 +58,8 @@ void main()
     fColour = vColour;
     fPalettes = vec3(vPalettes);
 
+    fScreenHeight = uScreenSize.y;
+
     // Transform texture coordinates to viewport coordinates
     pos = pos * 2.0 - 1.0;
     gl_Position = vec4(pos, depth, 1.0);
diff --git a/distribution/changelog.txt b/distribution/changelog.txt
index d67ca1e908..5a6d5c264a 100644
--- a/distribution/changelog.txt
+++ b/distribution/changelog.txt
@@ -12,6 +12,7 @@
 - Fix: [#16988] AppImage version does not show changelog.
 - Fix: [#18048] Play music from all ride's stations.
 - Fix: [#24001] Sloped diagonal metal supports that are offset with a crossbeam draw incorrectly.
+- Fix: [#24151] Sprites are cut off by 1 row of pixels when using OpenGL on Intel Macs.
 - Fix: [#24173] Allow all game speeds between 1 and 8 if developer mode is on.
 - Fix: [#24745] Potential crash when lighting effects are enabled and loading a save or a new scenario.
 - Fix: [#24835] Dive loop track pieces do not have tunnels.