From 1ba0547bfbe08b6b0a84760730d4ddaeea9f1d0d Mon Sep 17 00:00:00 2001
From: Niklas Haas <git@haasn.dev>
Date: Sat, 15 Jan 2022 10:27:21 +0100
Subject: vo_gpu: add HOOKED_gather

Can be used conditionally (via #ifdef HOOKED_gather) to use
textureGather in custom shaders.
---
 video/out/gpu/video.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/video/out/gpu/video.c b/video/out/gpu/video.c
index d0d0509792..449728ccb5 100644
--- a/video/out/gpu/video.c
+++ b/video/out/gpu/video.c
@@ -1412,6 +1412,11 @@ static void hook_prelude(struct gl_video *p, const char *name, int id,
     GLSLHF("#define %s_tex(pos) (%s_mul * vec4(texture(%s_raw, pos)).%s)\n",
            name, name, name, crap);
 
+    if (p->ra->caps & RA_CAP_GATHER) {
+        GLSLHF("#define %s_gather(pos, c) (%s_mul * vec4("
+               "textureGather(%s_raw, pos, c)))\n", name, name, name);
+    }
+
     // Since the extra matrix multiplication impacts performance,
     // skip it unless the texture was actually rotated
     if (gl_transform_eq(img.transform, identity_trans)) {
-- 
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