Commit: a498d889188420eb5f02c7e6cfe81ce9b0bf692e
Author: Antony Riakiotakis
Date: Wed Jul 9 21:24:37 2014 +0300
https://developer.blender.org/rBa498d889188420eb5f02c7e6cfe81ce9b0bf692e
Attempt to mitigate issue T40981
Clipping border causes a software fallback on ATIs. We have disabled it
in that case but from minor digging on the net seems like Intels support
this, so enable.
===================================================================
M source/blender/gpu/shaders/gpu_shader_simple_vert.glsl
M source/blender/gpu/shaders/gpu_shader_vertex.glsl
===================================================================
diff --git a/source/blender/gpu/shaders/gpu_shader_simple_vert.glsl
b/source/blender/gpu/shaders/gpu_shader_simple_vert.glsl
index 9491eaa..830dbec 100644
--- a/source/blender/gpu/shaders/gpu_shader_simple_vert.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_simple_vert.glsl
@@ -29,7 +29,7 @@ void main()
gl_Position = gl_ProjectionMatrix * co;
-#ifdef GPU_NVIDIA
+#ifndef GPU_ATI
// Setting gl_ClipVertex is necessary to get glClipPlane working on
NVIDIA
// graphic cards, while on ATI it can cause a software fallback.
gl_ClipVertex = gl_ModelViewMatrix * gl_Vertex;
diff --git a/source/blender/gpu/shaders/gpu_shader_vertex.glsl
b/source/blender/gpu/shaders/gpu_shader_vertex.glsl
index 8741a13..159e531 100644
--- a/source/blender/gpu/shaders/gpu_shader_vertex.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_vertex.glsl
@@ -10,7 +10,7 @@ void main()
varnormal = normalize(gl_NormalMatrix * gl_Normal);
gl_Position = gl_ProjectionMatrix * co;
-#ifdef GPU_NVIDIA
+#ifndef GPU_ATI
// Setting gl_ClipVertex is necessary to get glClipPlane working on
NVIDIA
// graphic cards, while on ATI it can cause a software fallback.
gl_ClipVertex = gl_ModelViewMatrix * gl_Vertex;
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