From 91b0cba1459257a045d38ac8a27cb36a7caafa69 Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Sun, 5 Mar 2023 14:10:21 +1100
Subject: [PATCH] [client] egl: switch from `mediump` to `highp`

This fixes a rounding issue on certain hardware (NVidia) which actually
implement mediump as half precision (16-bit) float. It's safe to assume
`highp` is available as if the GPU does not support it, then the shader
compiler will try to find a lower precision that is supported by the GPU
---
 client/renderers/EGL/shader/basic.vert              | 2 +-
 client/renderers/EGL/shader/cursor.vert             | 2 +-
 client/renderers/EGL/shader/cursor_mono.frag        | 2 +-
 client/renderers/EGL/shader/cursor_rgb.frag         | 2 +-
 client/renderers/EGL/shader/damage.frag             | 2 +-
 client/renderers/EGL/shader/desktop.vert            | 2 +-
 client/renderers/EGL/shader/desktop_rgb.frag        | 2 +-
 client/renderers/EGL/shader/downscale.frag          | 2 +-
 client/renderers/EGL/shader/downscale_lanczos2.frag | 2 +-
 client/renderers/EGL/shader/downscale_linear.frag   | 2 +-
 client/renderers/EGL/shader/ffx_cas.frag            | 2 +-
 client/renderers/EGL/shader/ffx_fsr1_easu.frag      | 2 +-
 client/renderers/EGL/shader/ffx_fsr1_rcas.frag      | 2 +-
 13 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/client/renderers/EGL/shader/basic.vert b/client/renderers/EGL/shader/basic.vert
index 82153dbd..6e13d395 100644
--- a/client/renderers/EGL/shader/basic.vert
+++ b/client/renderers/EGL/shader/basic.vert
@@ -1,5 +1,5 @@
 #version 300 es
-precision mediump float;
+precision highp float;
 
 layout(location = 0) in vec2 vertex;
 out vec2 fragCoord;
diff --git a/client/renderers/EGL/shader/cursor.vert b/client/renderers/EGL/shader/cursor.vert
index f1daca30..d7bf0eb8 100644
--- a/client/renderers/EGL/shader/cursor.vert
+++ b/client/renderers/EGL/shader/cursor.vert
@@ -1,5 +1,5 @@
 #version 300 es
-precision mediump float;
+precision highp float;
 
 layout(location = 0) in vec3 vertexPosition_modelspace;
 layout(location = 1) in vec2 vertexUV;
diff --git a/client/renderers/EGL/shader/cursor_mono.frag b/client/renderers/EGL/shader/cursor_mono.frag
index dfb5eb0b..99d54d64 100644
--- a/client/renderers/EGL/shader/cursor_mono.frag
+++ b/client/renderers/EGL/shader/cursor_mono.frag
@@ -1,5 +1,5 @@
 #version 300 es
-precision mediump float;
+precision highp float;
 
 in  vec2 uv;
 out vec4 color;
diff --git a/client/renderers/EGL/shader/cursor_rgb.frag b/client/renderers/EGL/shader/cursor_rgb.frag
index 756aa357..cc4268a3 100644
--- a/client/renderers/EGL/shader/cursor_rgb.frag
+++ b/client/renderers/EGL/shader/cursor_rgb.frag
@@ -1,5 +1,5 @@
 #version 300 es
-precision mediump float;
+precision highp float;
 
 #include "color_blind.h"
 
diff --git a/client/renderers/EGL/shader/damage.frag b/client/renderers/EGL/shader/damage.frag
index 40e87de4..ebc01326 100644
--- a/client/renderers/EGL/shader/damage.frag
+++ b/client/renderers/EGL/shader/damage.frag
@@ -1,5 +1,5 @@
 #version 300 es
-precision mediump float;
+precision highp float;
 
 out vec4 color;
 
diff --git a/client/renderers/EGL/shader/desktop.vert b/client/renderers/EGL/shader/desktop.vert
index 24c2e163..36a22249 100644
--- a/client/renderers/EGL/shader/desktop.vert
+++ b/client/renderers/EGL/shader/desktop.vert
@@ -1,5 +1,5 @@
 #version 300 es
-precision mediump float;
+precision highp float;
 
 layout(location = 0) in vec2 vertex;
 out vec2 uv;
diff --git a/client/renderers/EGL/shader/desktop_rgb.frag b/client/renderers/EGL/shader/desktop_rgb.frag
index 6b2c6f34..ed4ec1ad 100644
--- a/client/renderers/EGL/shader/desktop_rgb.frag
+++ b/client/renderers/EGL/shader/desktop_rgb.frag
@@ -1,5 +1,5 @@
 #version 300 es
-precision mediump float;
+precision highp float;
 
 #define EGL_SCALE_AUTO    0
 #define EGL_SCALE_NEAREST 1
diff --git a/client/renderers/EGL/shader/downscale.frag b/client/renderers/EGL/shader/downscale.frag
index 78614c25..2561ed7e 100644
--- a/client/renderers/EGL/shader/downscale.frag
+++ b/client/renderers/EGL/shader/downscale.frag
@@ -1,5 +1,5 @@
 #version 300 es
-precision mediump float;
+precision highp float;
 
 in  vec2  fragCoord;
 out vec4  fragColor;
diff --git a/client/renderers/EGL/shader/downscale_lanczos2.frag b/client/renderers/EGL/shader/downscale_lanczos2.frag
index 9530e22f..08675f56 100644
--- a/client/renderers/EGL/shader/downscale_lanczos2.frag
+++ b/client/renderers/EGL/shader/downscale_lanczos2.frag
@@ -1,5 +1,5 @@
 #version 300 es
-precision mediump float;
+precision highp float;
 
 #define PI 3.141592653589793
 
diff --git a/client/renderers/EGL/shader/downscale_linear.frag b/client/renderers/EGL/shader/downscale_linear.frag
index c68c39f0..e345c0e2 100644
--- a/client/renderers/EGL/shader/downscale_linear.frag
+++ b/client/renderers/EGL/shader/downscale_linear.frag
@@ -1,5 +1,5 @@
 #version 300 es
-precision mediump float;
+precision highp float;
 
 in  vec2  fragCoord;
 out vec4  fragColor;
diff --git a/client/renderers/EGL/shader/ffx_cas.frag b/client/renderers/EGL/shader/ffx_cas.frag
index 4312bf21..5e799b2d 100644
--- a/client/renderers/EGL/shader/ffx_cas.frag
+++ b/client/renderers/EGL/shader/ffx_cas.frag
@@ -1,5 +1,5 @@
 #version 300 es
-precision mediump float;
+precision highp float;
 
 #include "compat.h"
 
diff --git a/client/renderers/EGL/shader/ffx_fsr1_easu.frag b/client/renderers/EGL/shader/ffx_fsr1_easu.frag
index d9e1ac14..2812a1cd 100644
--- a/client/renderers/EGL/shader/ffx_fsr1_easu.frag
+++ b/client/renderers/EGL/shader/ffx_fsr1_easu.frag
@@ -1,5 +1,5 @@
 #version 300 es
-precision mediump float;
+precision highp float;
 
 #include "compat.h"
 
diff --git a/client/renderers/EGL/shader/ffx_fsr1_rcas.frag b/client/renderers/EGL/shader/ffx_fsr1_rcas.frag
index 61f8f2f1..b7dc4881 100644
--- a/client/renderers/EGL/shader/ffx_fsr1_rcas.frag
+++ b/client/renderers/EGL/shader/ffx_fsr1_rcas.frag
@@ -1,5 +1,5 @@
 #version 300 es
-precision mediump float;
+precision highp float;
 
 #include "compat.h"