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compiler: Move double_inputs to gl_program::DualSlotInputs

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Previously, we had two field in shader_info: double_inputs_read and
double_inputs.  Presumably, the one was for all double inputs that are
read and the other is all that exist.  However, because nir_gather_info
regenerates these two values, there is a possibility, if a variable gets
deleted, that the value of double_inputs could change over time.  This
is a problem because double_inputs is used to remap the input locations
to a two-slot-per-dvec3/4 scheme for i965.  If that mapping were to
change between glsl_to_nir and back-end state setup, we would fall over
when trying to map the NIR outputs back onto the GL location space.

This commit changes the way slot re-mapping works.  Instead of the
double_inputs field in shader_info, it adds a DualSlotInputs bitfield to
gl_program.  By having it in gl_program, we more easily guarantee that
NIR passes won't touch it after it's been set.  It also makes more sense
to put it in a GL data structure since it's really a mapping from GL
slots to back-end and/or NIR slots and not really a NIR shader thing.

Tested-by: Alejandro Piñeiro <apinheiro@igalia.com> (ARB_gl_spirv tests)
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
This commit is contained in:
Jason Ekstrand
2018-08-30 15:02:25 -05:00
parent 1285f71d3e
commit 25efd787cf
14 changed files with 83 additions and 65 deletions
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6
src/compiler/nir/nir_gather_info.c
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@@ -54,11 +54,6 @@ set_io_mask(nir_shader *shader, nir_variable *var, int offset, int len,
else
shader->info.inputs_read |= bitfield;
/* double inputs read is only for vertex inputs */
if (shader->info.stage == MESA_SHADER_VERTEX &&
glsl_type_is_dual_slot(glsl_without_array(var->type)))
shader->info.vs.double_inputs_read |= bitfield;
if (shader->info.stage == MESA_SHADER_FRAGMENT) {
shader->info.fs.uses_sample_qualifier |= var->data.sample;
}
@@ -417,7 +412,6 @@ nir_shader_gather_info(nir_shader *shader, nir_function_impl *entrypoint)
shader->info.system_values_read = 0;
if (shader->info.stage == MESA_SHADER_VERTEX) {
shader->info.vs.double_inputs = 0;
shader->info.vs.double_inputs_read = 0;
}
if (shader->info.stage == MESA_SHADER_FRAGMENT) {
shader->info.fs.uses_sample_qualifier = false;