Using INV_PROJECTION_MATRIX in gdshader causes editor to 100% cpu and hang on or after compilation.

[danger-dan]

Godot version

4.0 dev 35eec4d

System information

popOS! (Ubuntu), RTX2060, Vulkan

Issue description

Editor uses 100% cpu and hangs on compilation of a shader. This happens as soon as the builtin INV_PROJECTION_MATRIX is added to the code. The only useful logs i could get which may or may not be related is:

at: _compile_variant (servers/rendering/renderer_rd/shader_rd.cpp:280)
ERROR: Error compiling Fragment shader, variant #7 (
#define MODE_MULTIPLE_RENDER_TARGETS
).
at: _compile_variant (servers/rendering/renderer_rd/shader_rd.cpp:276)
ERROR: Failed parse:
WARNING: 0:72: '' : all default precisions are highp; use precision statements to quiet warning, e.g.:
"precision mediump int; precision highp float;"
ERROR: 0:2054: 'inv_projection_matrix' : undeclared identifier
ERROR: 0:2054: '' : compilation terminated
ERROR: 2 compilation errors. No code generated.

at: _compile_variant (servers/rendering/renderer_rd/shader_rd.cpp:277)
ERROR: code:

Steps to reproduce

create new project, add new shader resource and start writing - using INV_PROJECTION_MATRIX.

tested with:

void fragment(){
float depth = texture(DEPTH_TEXTURE, SCREEN_UV).x;
vec3 ndc = vec3(SCREEN_UV * 2.0 - 1.0, depth);
vec4 view = INV_PROJECTION_MATRIX * vec4(ndc, 1.0);
}

Minimal reproduction project

No response

[clayjohn]

Looks like we need to do something like this in the fragment shader

godot/servers/rendering/renderer_rd/shaders/scene_forward_clustered.glsl

Lines 263 to 264 in 35eec4d

	mat4 projection_matrix = scene_data.projection_matrix;
	mat4 inv_projection_matrix = scene_data.inv_projection_matrix;

INV_PROJECTION_MATRIX is renamed to inv_projection_matrix by Godot's shader compiler. But the fragment shader only has access to scene_data.inv_projection_matrix so we need to define inv_projection_matrix somewhere above the user's fragment shader code.