godot/thirdparty/spirv-reflect/patches/specialization-constants.patch

diff --git a/thirdparty/spirv-reflect/spirv_reflect.c b/thirdparty/spirv-reflect/spirv_reflect.c
index e9b11bf495..f181df5fa2 100644
--- a/thirdparty/spirv-reflect/spirv_reflect.c
+++ b/thirdparty/spirv-reflect/spirv_reflect.c
@@ -125,6 +125,9 @@ typedef struct SpvReflectPrvDecorations {
   SpvReflectPrvNumberDecoration   location;
   SpvReflectPrvNumberDecoration   offset;
   SpvReflectPrvNumberDecoration   uav_counter_buffer;
+// -- GODOT begin --
+  SpvReflectPrvNumberDecoration   specialization_constant;
+// -- GODOT end --
   SpvReflectPrvStringDecoration   semantic;
   uint32_t                        array_stride;
   uint32_t                        matrix_stride;
@@ -631,6 +634,9 @@ static SpvReflectResult ParseNodes(SpvReflectPrvParser* p_parser)
     p_parser->nodes[i].decorations.offset.value = (uint32_t)INVALID_VALUE;
     p_parser->nodes[i].decorations.uav_counter_buffer.value = (uint32_t)INVALID_VALUE;
     p_parser->nodes[i].decorations.built_in = (SpvBuiltIn)INVALID_VALUE;
+// -- GODOT begin --
+    p_parser->nodes[i].decorations.specialization_constant.value = (SpvBuiltIn)INVALID_VALUE;
+// -- GODOT end --
   }
   // Mark source file id node
   p_parser->source_file_id = (uint32_t)INVALID_VALUE;
@@ -821,10 +827,16 @@ static SpvReflectResult ParseNodes(SpvReflectPrvParser* p_parser)
         CHECKED_READU32(p_parser, p_node->word_offset + 2, p_node->result_id);
       }
       break;
-
+// -- GODOT begin --
       case SpvOpSpecConstantTrue:
       case SpvOpSpecConstantFalse:
-      case SpvOpSpecConstant:
+      case SpvOpSpecConstant: {
+        CHECKED_READU32(p_parser, p_node->word_offset + 1, p_node->result_type_id);
+        CHECKED_READU32(p_parser, p_node->word_offset + 2, p_node->result_id);
+        p_node->is_type = true;
+      }
+      break;
+// -- GODOT end --
       case SpvOpSpecConstantComposite:
       case SpvOpSpecConstantOp: {
         CHECKED_READU32(p_parser, p_node->word_offset + 1, p_node->result_type_id);
@@ -856,7 +868,7 @@ static SpvReflectResult ParseNodes(SpvReflectPrvParser* p_parser)
         CHECKED_READU32(p_parser, p_node->word_offset + 3, p_access_chain->base_id);
         //
         // SPIRV_ACCESS_CHAIN_INDEX_OFFSET (4) is the number of words up until the first index:
-        //   [Node, Result Type Id, Result Id, Base Id, <Indexes>]
+        //   [SpvReflectPrvNode, Result Type Id, Result Id, Base Id, <Indexes>]
         //
         p_access_chain->index_count = (node_word_count - SPIRV_ACCESS_CHAIN_INDEX_OFFSET);
         if (p_access_chain->index_count > 0) {
@@ -1338,6 +1350,9 @@ static SpvReflectResult ParseDecorations(SpvReflectPrvParser* p_parser)
         skip = true;
       }
       break;
+// -- GODOT begin --
+      case SpvDecorationSpecId:
+// -- GODOT end --
       case SpvDecorationRelaxedPrecision:
       case SpvDecorationBlock:
       case SpvDecorationBufferBlock:
@@ -1481,7 +1496,14 @@ static SpvReflectResult ParseDecorations(SpvReflectPrvParser* p_parser)
         p_target_decorations->input_attachment_index.word_offset = word_offset;
       }
       break;
-
+// -- GODOT begin --
+      case SpvDecorationSpecId: {
+        uint32_t word_offset = p_node->word_offset + member_offset+ 3;
+        CHECKED_READU32(p_parser, word_offset, p_target_decorations->specialization_constant.value);
+        p_target_decorations->specialization_constant.word_offset = word_offset;
+      }
+      break;
+// -- GODOT end --
       case SpvReflectDecorationHlslCounterBufferGOOGLE: {
         uint32_t word_offset = p_node->word_offset + member_offset+ 3;
         CHECKED_READU32(p_parser, word_offset, p_target_decorations->uav_counter_buffer.value);
@@ -1789,6 +1811,13 @@ static SpvReflectResult ParseType(
         p_type->type_flags |= SPV_REFLECT_TYPE_FLAG_EXTERNAL_ACCELERATION_STRUCTURE;
       }
       break;
+// -- GODOT begin --
+      case SpvOpSpecConstantTrue:
+      case SpvOpSpecConstantFalse:
+      case SpvOpSpecConstant: {
+      }
+      break;
+// -- GODOT end --
     }
 
     if (result == SPV_REFLECT_RESULT_SUCCESS) {
@@ -3269,6 +3298,69 @@ static SpvReflectResult ParseExecutionModes(
   return SPV_REFLECT_RESULT_SUCCESS;
 }
 
+// -- GODOT begin --
+static SpvReflectResult ParseSpecializationConstants(SpvReflectPrvParser* p_parser, SpvReflectShaderModule* p_module)
+{
+  p_module->specialization_constant_count = 0;
+  p_module->specialization_constants = NULL;
+  for (size_t i = 0; i < p_parser->node_count; ++i) {
+    SpvReflectPrvNode* p_node = &(p_parser->nodes[i]);
+    if (p_node->op == SpvOpSpecConstantTrue || p_node->op == SpvOpSpecConstantFalse || p_node->op == SpvOpSpecConstant) {
+      p_module->specialization_constant_count++;
+    }
+  }
+
+  if (p_module->specialization_constant_count == 0) {
+    return SPV_REFLECT_RESULT_SUCCESS;
+  }
+
+  p_module->specialization_constants = (SpvReflectSpecializationConstant*)calloc(p_module->specialization_constant_count, sizeof(SpvReflectSpecializationConstant));
+
+  uint32_t index = 0;
+
+  for (size_t i = 0; i < p_parser->node_count; ++i) {
+    SpvReflectPrvNode* p_node = &(p_parser->nodes[i]);
+    switch(p_node->op) {
+      default: continue;
+      case SpvOpSpecConstantTrue: {
+        p_module->specialization_constants[index].constant_type = SPV_REFLECT_SPECIALIZATION_CONSTANT_BOOL;
+        p_module->specialization_constants[index].default_value.int_bool_value = 1;
+      } break;
+      case SpvOpSpecConstantFalse: {
+        p_module->specialization_constants[index].constant_type = SPV_REFLECT_SPECIALIZATION_CONSTANT_BOOL;
+        p_module->specialization_constants[index].default_value.int_bool_value = 0;
+      } break;
+      case SpvOpSpecConstant: {
+        SpvReflectResult result = SPV_REFLECT_RESULT_SUCCESS;
+        uint32_t element_type_id = (uint32_t)INVALID_VALUE;
+        uint32_t default_value = 0;
+        IF_READU32(result, p_parser, p_node->word_offset + 1, element_type_id);
+        IF_READU32(result, p_parser, p_node->word_offset + 3, default_value);
+
+        SpvReflectPrvNode* p_next_node = FindNode(p_parser, element_type_id);
+
+        if (p_next_node->op == SpvOpTypeInt) {
+          p_module->specialization_constants[index].constant_type = SPV_REFLECT_SPECIALIZATION_CONSTANT_INT;
+        } else if (p_next_node->op == SpvOpTypeFloat) {
+          p_module->specialization_constants[index].constant_type = SPV_REFLECT_SPECIALIZATION_CONSTANT_FLOAT;
+        } else {
+          return SPV_REFLECT_RESULT_ERROR_PARSE_FAILED;
+        }
+
+        p_module->specialization_constants[index].default_value.int_bool_value = default_value; //bits are the same for int and float
+      } break;
+    }
+
+    p_module->specialization_constants[index].name = p_node->name;
+    p_module->specialization_constants[index].constant_id = p_node->decorations.specialization_constant.value;
+    p_module->specialization_constants[index].spirv_id = p_node->result_id;
+    index++;
+  }
+
+  return SPV_REFLECT_RESULT_SUCCESS;
+}
+// -- GODOT end --
+
 static SpvReflectResult ParsePushConstantBlocks(
   SpvReflectPrvParser*    p_parser, 
   SpvReflectShaderModule* p_module)
@@ -3650,6 +3742,12 @@ static SpvReflectResult CreateShaderModule(
     result = ParsePushConstantBlocks(&parser, p_module);
     SPV_REFLECT_ASSERT(result == SPV_REFLECT_RESULT_SUCCESS);
   }
+// -- GODOT begin --
+  if (result == SPV_REFLECT_RESULT_SUCCESS) {
+    result = ParseSpecializationConstants(&parser, p_module);
+    SPV_REFLECT_ASSERT(result == SPV_REFLECT_RESULT_SUCCESS);
+  }
+// -- GODOT end --
   if (result == SPV_REFLECT_RESULT_SUCCESS) {
     result = ParseEntryPoints(&parser, p_module);
     SPV_REFLECT_ASSERT(result == SPV_REFLECT_RESULT_SUCCESS);
@@ -3807,6 +3905,9 @@ void spvReflectDestroyShaderModule(SpvReflectShaderModule* p_module)
     SafeFree(p_entry->used_push_constants);
   }
   SafeFree(p_module->entry_points);
+// -- GODOT begin --
+  SafeFree(p_module->specialization_constants);
+// -- GODOT end --
 
   // Push constants
   for (size_t i = 0; i < p_module->push_constant_block_count; ++i) {
@@ -4077,6 +4178,38 @@ SpvReflectResult spvReflectEnumerateEntryPointInterfaceVariables(
   return SPV_REFLECT_RESULT_SUCCESS;
 }
 
+// -- GODOT begin --
+SpvReflectResult spvReflectEnumerateSpecializationConstants(
+  const SpvReflectShaderModule*      p_module,
+  uint32_t*                          p_count,
+  SpvReflectSpecializationConstant** pp_constants
+)
+{
+  if (IsNull(p_module)) {
+    return SPV_REFLECT_RESULT_ERROR_NULL_POINTER;
+  }
+  if (IsNull(p_count)) {
+    return SPV_REFLECT_RESULT_ERROR_NULL_POINTER;
+  }
+
+  if (IsNotNull(pp_constants)) {
+    if (*p_count != p_module->specialization_constant_count) {
+      return SPV_REFLECT_RESULT_ERROR_COUNT_MISMATCH;
+    }
+
+    for (uint32_t index = 0; index < *p_count; ++index) {
+      SpvReflectSpecializationConstant *p_const = &p_module->specialization_constants[index];
+      pp_constants[index] = p_const;
+    }
+  }
+  else {
+    *p_count = p_module->specialization_constant_count;
+  }
+
+  return SPV_REFLECT_RESULT_SUCCESS;
+}
+// -- GODOT end --
+
 SpvReflectResult spvReflectEnumerateInputVariables(
   const SpvReflectShaderModule* p_module,
   uint32_t*                     p_count,
diff --git a/thirdparty/spirv-reflect/spirv_reflect.h b/thirdparty/spirv-reflect/spirv_reflect.h
index e9e4c40755..948533d3c0 100644
--- a/thirdparty/spirv-reflect/spirv_reflect.h
+++ b/thirdparty/spirv-reflect/spirv_reflect.h
@@ -323,6 +323,28 @@ typedef struct SpvReflectTypeDescription {
   struct SpvReflectTypeDescription* members;
 } SpvReflectTypeDescription;
 
+// -- GODOT begin --
+/*! @struct SpvReflectSpecializationConstant
+
+*/
+
+typedef enum SpvReflectSpecializationConstantType {
+  SPV_REFLECT_SPECIALIZATION_CONSTANT_BOOL = 0,
+  SPV_REFLECT_SPECIALIZATION_CONSTANT_INT = 1,
+  SPV_REFLECT_SPECIALIZATION_CONSTANT_FLOAT = 2,
+} SpvReflectSpecializationConstantType;
+
+typedef struct SpvReflectSpecializationConstant {
+  const char* name;
+  uint32_t spirv_id;
+  uint32_t constant_id;
+  SpvReflectSpecializationConstantType constant_type;
+  union {
+    float float_value;
+    uint32_t int_bool_value;
+  } default_value;
+} SpvReflectSpecializationConstant;
+// -- GODOT end --
 
 /*! @struct SpvReflectInterfaceVariable
 
@@ -472,6 +494,10 @@ typedef struct SpvReflectShaderModule {
   SpvReflectInterfaceVariable*      interface_variables;                              // Uses value(s) from first entry point
   uint32_t                          push_constant_block_count;                        // Uses value(s) from first entry point
   SpvReflectBlockVariable*          push_constant_blocks;                             // Uses value(s) from first entry point
+  // -- GODOT begin --
+  uint32_t                          specialization_constant_count;
+  SpvReflectSpecializationConstant* specialization_constants;
+  // -- GODOT end --
 
   struct Internal {
     SpvReflectModuleFlags           module_flags;
@@ -744,6 +770,33 @@ SpvReflectResult spvReflectEnumerateInputVariables(
   SpvReflectInterfaceVariable** pp_variables
 );
 
+// -- GOODT begin --
+/*! @fn spvReflectEnumerateSpecializationConstants
+ @brief  If the module contains multiple entry points, this will only get
+         the specialization constants for the first one.
+ @param  p_module      Pointer to an instance of SpvReflectShaderModule.
+ @param  p_count       If pp_constants is NULL, the module's specialization constant
+                       count will be stored here.
+                       If pp_variables is not NULL, *p_count must contain
+                       the module's specialization constant count.
+ @param  pp_variables  If NULL, the module's specialization constant count will be
+                       written to *p_count.
+                       If non-NULL, pp_constants must point to an array with
+                       *p_count entries, where pointers to the module's
+                       specialization constants will be written. The caller must not
+                       free the specialization constants written to this array.
+ @return               If successful, returns SPV_REFLECT_RESULT_SUCCESS.
+                       Otherwise, the error code indicates the cause of the
+                       failure.
+
+*/
+SpvReflectResult spvReflectEnumerateSpecializationConstants(
+  const SpvReflectShaderModule*      p_module,
+  uint32_t*                          p_count,
+  SpvReflectSpecializationConstant** pp_constants
+);
+// -- GODOT end --
+
 /*! @fn spvReflectEnumerateEntryPointInputVariables
  @brief  Enumerate the input variables for a given entry point.
  @param  entry_point The name of the entry point to get the input variables for.