glsl: remember per-component vertex streams for packed varyings

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/compiler/glsl/ir.h

@@ -917,6 +917,9 @@ public:
 
       /**
        * Vertex stream output identifier.
+       *
+       * For packed outputs, bit 31 is set and bits [2*i+1,2*i] indicate the
+       * stream of the i-th component.
        */
       unsigned stream;
 

src/compiler/glsl/ir_print_visitor.cpp

@@ -177,6 +177,17 @@ void ir_print_visitor::visit(ir_variable *ir)
    if (ir->data.explicit_component)
       snprintf(component, sizeof(component), "component=%i ", ir->data.location_frac);
 
+   char stream[32] = {0};
+   if (ir->data.stream & (1u << 31)) {
+      if (ir->data.stream & ~(1u << 31)) {
+         snprintf(stream, sizeof(stream), "stream(%u,%u,%u,%u) ",
+                  ir->data.stream & 3, (ir->data.stream >> 2) & 3,
+                  (ir->data.stream >> 4) & 3, (ir->data.stream >> 6) & 3);
+      }
+   } else if (ir->data.stream) {
+      snprintf(stream, sizeof(stream), "stream%u ", ir->data.stream);
+   }
+
    const char *const cent = (ir->data.centroid) ? "centroid " : "";
    const char *const samp = (ir->data.sample) ? "sample " : "";
    const char *const patc = (ir->data.patch) ? "patch " : "";
@@ -187,13 +198,12 @@ void ir_print_visitor::visit(ir_variable *ir)
                                 "in ", "out ", "inout ",
 			        "const_in ", "sys ", "temporary " };
    STATIC_ASSERT(ARRAY_SIZE(mode) == ir_var_mode_count);
-   const char *const stream [] = {"", "stream1 ", "stream2 ", "stream3 "};
    const char *const interp[] = { "", "smooth", "flat", "noperspective" };
    STATIC_ASSERT(ARRAY_SIZE(interp) == INTERP_MODE_COUNT);
 
    fprintf(f, "(%s%s%s%s%s%s%s%s%s%s%s) ",
            binding, loc, component, cent, samp, patc, inv, prec, mode[ir->data.mode],
-           stream[ir->data.stream],
+           stream,
            interp[ir->data.interpolation]);
 
    print_type(f, ir->type);

src/compiler/glsl/lower_packed_varyings.cpp

@@ -531,6 +531,14 @@ lower_packed_varyings_visitor::lower_rvalue(ir_rvalue *rvalue,
       ir_dereference *packed_deref =
          this->get_packed_varying_deref(location, unpacked_var, name,
                                         vertex_index);
+      if (unpacked_var->data.stream != 0) {
+         assert(unpacked_var->data.stream < 4);
+         ir_variable *packed_var = packed_deref->variable_referenced();
+         for (unsigned i = 0; i < components; ++i) {
+            packed_var->data.stream |=
+               unpacked_var->data.stream << (2 * (location_frac + i));
+         }
+      }
       ir_swizzle *swizzle = new(this->mem_ctx)
          ir_swizzle(packed_deref, swizzle_values, components);
       if (this->mode == ir_var_shader_out) {
@@ -639,6 +647,7 @@ lower_packed_varyings_visitor::get_packed_varying_deref(
       packed_var->data.location = location;
       packed_var->data.precision = unpacked_var->data.precision;
       packed_var->data.always_active_io = unpacked_var->data.always_active_io;
+      packed_var->data.stream = 1u << 31;
       unpacked_var->insert_before(packed_var);
       this->packed_varyings[slot] = packed_var;
    } else {