From 3ae996c293ea290483f9d1b1688977e0403fa4ba Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Foucault?= <fclem>
Date: Mon, 5 Sep 2022 09:20:30 +0200
Subject: Fix T100649: Regression: Environment texture is stretched when added
 to mesh

The new code was not using the correct default attribute. Add access to
`g_data.P` through `node_tex_coord_position()` to replace the old
`GPU_builtin(GPU_VIEW_POSITION)` which was used before.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D15862
---
 .../shaders/material/gpu_shader_material_texture_coordinates.glsl   | 5 +++++
 source/blender/nodes/shader/nodes/node_shader_tex_environment.cc    | 6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/source/blender/gpu/shaders/material/gpu_shader_material_texture_coordinates.glsl b/source/blender/gpu/shaders/material/gpu_shader_material_texture_coordinates.glsl
index 204f134dfa6..c849553ae4c 100644
--- a/source/blender/gpu/shaders/material/gpu_shader_material_texture_coordinates.glsl
+++ b/source/blender/gpu/shaders/material/gpu_shader_material_texture_coordinates.glsl
@@ -1,4 +1,9 @@
 
+void node_tex_coord_position(out vec3 out_pos)
+{
+  out_pos = g_data.P;
+}
+
 void node_tex_coord(mat4 obmatinv,
                     vec3 attr_orco,
                     vec4 attr_uv,
diff --git a/source/blender/nodes/shader/nodes/node_shader_tex_environment.cc b/source/blender/nodes/shader/nodes/node_shader_tex_environment.cc
index df5fbac3ab5..2739a75ed21 100644
--- a/source/blender/nodes/shader/nodes/node_shader_tex_environment.cc
+++ b/source/blender/nodes/shader/nodes/node_shader_tex_environment.cc
@@ -50,7 +50,11 @@ static int node_shader_gpu_tex_environment(GPUMaterial *mat,
     return GPU_stack_link(mat, node, "node_tex_environment_empty", in, out);
   }
 
-  node_shader_gpu_default_tex_coord(mat, node, &in[0].link);
+  if (!in[0].link) {
+    GPU_link(mat, "node_tex_coord_position", &in[0].link);
+    node_shader_gpu_bump_tex_coord(mat, node, &in[0].link);
+  }
+
   node_shader_gpu_tex_mapping(mat, node, in, out);
 
   /* Compute texture coordinate. */
-- 
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