spirv: add interface for drivers to define support extensions.

I expect over time the struct contents will change as all
drivers support stuff etc, but for now this should be a good
starting point.

Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/compiler/spirv/nir_spirv.h

@@ -41,10 +41,16 @@ struct nir_spirv_specialization {
    uint32_t data;
 };
 
+struct nir_spirv_supported_extensions {
+   bool storage_image_extended_formats;
+   bool image_ms_array;
+};
+
 nir_function *spirv_to_nir(const uint32_t *words, size_t word_count,
                            struct nir_spirv_specialization *specializations,
                            unsigned num_specializations,
                            gl_shader_stage stage, const char *entry_point_name,
+                           const struct nir_spirv_supported_extensions *ext,
                            const nir_shader_compiler_options *options);
 
 #ifdef __cplusplus

src/compiler/spirv/spirv2nir.c

@@ -73,7 +73,7 @@ int main(int argc, char **argv)
    }
 
    nir_function *func = spirv_to_nir(map, word_count, NULL, 0,
-                                     MESA_SHADER_FRAGMENT, "main", NULL);
+                                     MESA_SHADER_FRAGMENT, "main", NULL, NULL);
    nir_print_shader(func->shader, stderr);
 
    return 0;

src/compiler/spirv/spirv_to_nir.c

@@ -2461,6 +2461,12 @@ stage_for_execution_model(SpvExecutionModel model)
    }
 }
 
+#define spv_check_supported(name, cap) do {		\
+      if (!(b->ext && b->ext->name))			\
+         vtn_warn("Unsupported SPIR-V capability: %s",  \
+                  spirv_capability_to_string(cap));     \
+   } while(0)
+
 static bool
 vtn_handle_preamble_instruction(struct vtn_builder *b, SpvOp opcode,
                                 const uint32_t *w, unsigned count)
@@ -2519,8 +2525,6 @@ vtn_handle_preamble_instruction(struct vtn_builder *b, SpvOp opcode,
       case SpvCapabilityInt8:
       case SpvCapabilitySparseResidency:
       case SpvCapabilityMinLod:
-      case SpvCapabilityImageMSArray:
-      case SpvCapabilityStorageImageExtendedFormats:
       case SpvCapabilityTransformFeedback:
       case SpvCapabilityStorageImageReadWithoutFormat:
       case SpvCapabilityStorageImageWriteWithoutFormat:
@@ -2541,6 +2545,13 @@ vtn_handle_preamble_instruction(struct vtn_builder *b, SpvOp opcode,
          vtn_warn("Unsupported OpenCL-style SPIR-V capability: %s",
                   spirv_capability_to_string(cap));
          break;
+
+      case SpvCapabilityStorageImageExtendedFormats:
+         spv_check_supported(storage_image_extended_formats, cap);
+         break;
+      case SpvCapabilityImageMSArray:
+         spv_check_supported(image_ms_array, cap);
+         break;
       }
       break;
    }
@@ -3015,6 +3026,7 @@ nir_function *
 spirv_to_nir(const uint32_t *words, size_t word_count,
              struct nir_spirv_specialization *spec, unsigned num_spec,
              gl_shader_stage stage, const char *entry_point_name,
+             const struct nir_spirv_supported_extensions *ext,
              const nir_shader_compiler_options *options)
 {
    const uint32_t *word_end = words + word_count;
@@ -3037,6 +3049,7 @@ spirv_to_nir(const uint32_t *words, size_t word_count,
    exec_list_make_empty(&b->functions);
    b->entry_point_stage = stage;
    b->entry_point_name = entry_point_name;
+   b->ext = ext;
 
    /* Handle all the preamble instructions */
    words = vtn_foreach_instruction(b, words, word_end,

src/compiler/spirv/vtn_private.h

@@ -347,6 +347,7 @@ struct vtn_builder {
 
    nir_shader *shader;
    nir_function_impl *impl;
+   const struct nir_spirv_supported_extensions *ext;
    struct vtn_block *block;
 
    /* Current file, line, and column.  Useful for debugging.  Set

src/intel/vulkan/anv_pipeline.c

@@ -124,7 +124,7 @@ anv_shader_compile_to_nir(struct anv_device *device,
    nir_function *entry_point =
       spirv_to_nir(spirv, module->size / 4,
                    spec_entries, num_spec_entries,
-                   stage, entrypoint_name, nir_options);
+                   stage, entrypoint_name, NULL, nir_options);
    nir_shader *nir = entry_point->shader;
    assert(nir->stage == stage);
    nir_validate_shader(nir);