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nir: Record info->fs.pixel_center_integer in lower_system_values

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radeonsi uses a system value for gl_FragCoord rather than an input var.
These get translated into load_frag_coord NIR intrinsics, which lose the
pixel_center_integer and origin_upper_left decorations.  To cope with
this, Tim added a shader_info field for pixel_center_integer, and made
glsl_to_nir set it accordingly.

prog_to_nir also needs to handle these fragcoord conventions.  Instead
of duplicating the logic to set the info field, just move it to
nir_lower_system_values so it'll happen regardless of who makes the NIR.

(For what it's worth, we don't need an info flag for origin_upper_left,
because radeonsi lowers origin conventions in nir_lower_wpos_ytransform
before nir_lower_system_values destroys the variable and qualifiers.)

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Kenneth Graunke
2019-02-02 00:43:42 -08:00
parent 536abd453b
commit 3327c93510
2 changed files with 6 additions and 5 deletions
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5
src/compiler/glsl/glsl_to_nir.cpp
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@@ -389,11 +389,6 @@ nir_visitor::visit(ir_variable *ir)
var->data.pixel_center_integer = ir->data.pixel_center_integer;
var->data.location_frac = ir->data.location_frac;
if (var->data.pixel_center_integer) {
assert(shader->info.stage == MESA_SHADER_FRAGMENT);
shader->info.fs.pixel_center_integer = true;
}
switch (ir->data.depth_layout) {
case ir_depth_layout_none:
var->data.depth_layout = nir_depth_layout_none;