From 89673f0974d87350bede74eaa62788684d21b36e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Foucault?= <foucault.clem@gmail.com>
Date: Thu, 16 May 2019 14:16:23 +0200
Subject: [PATCH] DRW: Make fullscreen vertex shader position and uv without
 attributes

---
 .../draw/modes/shaders/common_fullscreen_vert.glsl       | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/source/blender/draw/modes/shaders/common_fullscreen_vert.glsl b/source/blender/draw/modes/shaders/common_fullscreen_vert.glsl
index a1e6bb0f43d..8a7fb97d98c 100644
--- a/source/blender/draw/modes/shaders/common_fullscreen_vert.glsl
+++ b/source/blender/draw/modes/shaders/common_fullscreen_vert.glsl
@@ -1,10 +1,11 @@
 
-in vec2 pos;
-in vec2 uvs;
 out vec4 uvcoordsvar;
 
 void main()
 {
-  uvcoordsvar = vec4(uvs, 0.0, 0.0);
-  gl_Position = vec4(pos, 1.0, 1.0);
+  int v = gl_VertexID % 3;
+  float x = -1.0 + float((v & 1) << 2);
+  float y = -1.0 + float((v & 2) << 1);
+  gl_Position = vec4(x, y, 1.0, 1.0);
+  uvcoordsvar = vec4((gl_Position.xy + 1.0) * 0.5, 0.0, 0.0);
 }