compiler: Move double_inputs to gl_program::DualSlotInputs

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 <[email protected]> (ARB_gl_spirv tests)
Reviewed-by: Alejandro Piñeiro <[email protected]>
Reviewed-by: Timothy Arceri <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/compiler/glsl/serialize.cpp b/src/compiler/glsl/serialize.cpp
index 889038fb5e2..267700e7e78 100644
--- a/src/compiler/glsl/serialize.cpp
+++ b/src/compiler/glsl/serialize.cpp
@@ -1035,6 +1035,7 @@ write_shader_metadata(struct blob *metadata, gl_linked_shader *shader)
    struct gl_program *glprog = shader->Program;
    unsigned i;
 
+   blob_write_uint64(metadata, glprog->DualSlotInputs);
    blob_write_bytes(metadata, glprog->TexturesUsed,
                     sizeof(glprog->TexturesUsed));
    blob_write_uint64(metadata, glprog->SamplersUsed);
@@ -1088,6 +1089,7 @@ read_shader_metadata(struct blob_reader *metadata,
 {
    unsigned i;
 
+   glprog->DualSlotInputs = blob_read_uint64(metadata);
    blob_copy_bytes(metadata, (uint8_t *) glprog->TexturesUsed,
                    sizeof(glprog->TexturesUsed));
    glprog->SamplersUsed = blob_read_uint64(metadata);