Vulkan: Add pass name handling.

Add #pragma name.

gfx/drivers_shader/glslang_util.cpp

@@ -101,8 +101,11 @@ static string build_stage_source(const vector<string> &lines, const char *stage)
    {
       if (itr->find("#pragma stage ") != string::npos)
       {
-         auto expected = string("#pragma stage ") + stage;
-         active = itr->find(expected) != string::npos;
+         if (stage)
+         {
+            auto expected = string("#pragma stage ") + stage;
+            active = itr->find(expected) != string::npos;
+         }
 
          // Improve debuggability.
          if (active)
@@ -120,14 +123,39 @@ static string build_stage_source(const vector<string> &lines, const char *stage)
    return str.str();
 }
 
+static bool glslang_parse_meta(const vector<string> &lines, glslang_meta *meta)
+{
+   *meta = glslang_meta{};
+   for (auto &line : lines)
+   {
+      if (line.find("#pragma name ") != string::npos)
+      {
+         if (!meta->name.empty())
+         {
+            RARCH_ERR("[slang]: Trying to declare multiple names for file.\n");
+            return false;
+         }
+
+         const char *str = line.c_str() + strlen("#pragma name ");
+         while (*str == ' ')
+            str++;
+         meta->name = str;
+      }
+   }
+   return true;
+}
+
 bool glslang_compile_shader(const char *shader_path, glslang_output *output)
 {
    vector<string> lines;
 
-   RARCH_LOG("Compiling shader \"%s\".\n", shader_path);
+   RARCH_LOG("[slang]: Compiling shader \"%s\".\n", shader_path);
    if (!read_shader_file(shader_path, &lines))
       return false;
 
+   if (!glslang_parse_meta(lines, &output->meta))
+      return false;
+
    auto &header = lines.front();
    if (header.find_first_of("#version ") == string::npos)
    {

gfx/drivers_shader/glslang_util.hpp

@@ -18,11 +18,18 @@
 
 #include <stdint.h>
 #include <vector>
+#include <string>
+
+struct glslang_meta
+{
+   std::string name;
+};
 
 struct glslang_output
 {
    std::vector<uint32_t> vertex;
    std::vector<uint32_t> fragment;
+   glslang_meta meta;
 };
 
 bool glslang_compile_shader(const char *shader_path, glslang_output *output);

gfx/drivers_shader/shader_vulkan.cpp

@@ -290,6 +290,16 @@ class Pass
          frame_count_period = period;
       }
 
+      void set_name(const char *name)
+      {
+         pass_name = name;
+      }
+
+      const string &get_name() const
+      {
+         return pass_name;
+      }
+
       vulkan_filter_chain_filter get_source_filter() const
       {
          return pass_info.source_filter;
@@ -375,6 +385,8 @@ class Pass
 
       uint64_t frame_count = 0;
       unsigned frame_count_period = 0;
+
+      string pass_name;
 };
 
 // struct here since we're implementing the opaque typedef from C.
@@ -411,6 +423,7 @@ struct vulkan_filter_chain
 
       void set_frame_count(uint64_t count);
       void set_frame_count_period(unsigned pass, unsigned period);
+      void set_pass_name(unsigned pass, const char *name);
 
    private:
       VkDevice device;
@@ -439,6 +452,7 @@ struct vulkan_filter_chain
 
       bool init_history();
       bool init_feedback();
+      bool init_alias();
       void update_history(DeferredDisposer &disposer, VkCommandBuffer cmd);
       vector<unique_ptr<Framebuffer>> original_history;
       bool require_clear = false;
@@ -543,6 +557,11 @@ void vulkan_filter_chain::set_frame_count_period(unsigned pass, unsigned period)
    passes[pass]->set_frame_count_period(period);
 }
 
+void vulkan_filter_chain::set_pass_name(unsigned pass, const char *name)
+{
+   passes[pass]->set_name(name);
+}
+
 void vulkan_filter_chain::execute_deferred()
 {
    for (auto &calls : deferred_calls)
@@ -674,13 +693,66 @@ bool vulkan_filter_chain::init_feedback()
    return true;
 }
 
+template <typename M, typename P>
+static bool set_unique_map(M &m, const string &name, const P &p)
+{
+   auto itr = m.find(name);
+   if (itr != end(m))
+   {
+      RARCH_ERR("[slang]: Alias \"%s\" already exists.\n",
+            name.c_str());
+      return false;
+   }
+
+   m[name] = p;
+   return true;
+}
+
+bool vulkan_filter_chain::init_alias()
+{
+   common.texture_semantic_map.clear();
+   common.texture_semantic_uniform_map.clear();
+   common.semantic_map.clear();
+
+   unsigned i = 0;
+   for (auto &pass : passes)
+   {
+      auto &name = pass->get_name();
+      if (name.empty())
+         continue;
+
+      if (!set_unique_map(common.texture_semantic_map, name,
+               slang_texture_semantic_map{ SLANG_TEXTURE_SEMANTIC_PASS_OUTPUT, i }))
+         return false;
+
+      if (!set_unique_map(common.texture_semantic_uniform_map, name + "Size",
+               slang_texture_semantic_map{ SLANG_TEXTURE_SEMANTIC_PASS_OUTPUT, i }))
+         return false;
+
+      if (!set_unique_map(common.texture_semantic_map, name + "Feedback",
+               slang_texture_semantic_map{ SLANG_TEXTURE_SEMANTIC_PASS_FEEDBACK, i }))
+         return false;
+
+      if (!set_unique_map(common.texture_semantic_uniform_map, name + "FeedbackSize",
+               slang_texture_semantic_map{ SLANG_TEXTURE_SEMANTIC_PASS_FEEDBACK, i }))
+         return false;
+
+      i++;
+   }
+   return true;
+}
+
 bool vulkan_filter_chain::init()
 {
    Size2D source = max_input_size;
 
+   if (!init_alias())
+      return false;
    for (unsigned i = 0; i < passes.size(); i++)
    {
       auto &pass = passes[i];
+      RARCH_LOG("[slang]: Building pass #%u (%s)\n", i, pass->get_name().empty() ? "N/A" : pass->get_name().c_str());
+
       source = pass->set_pass_info(max_input_size,
             source, swapchain_info, pass_info[i]);
       if (!pass->build())
@@ -1955,6 +2027,13 @@ vulkan_filter_chain_t *vulkan_filter_chain_create_from_preset(
 
       chain->set_frame_count_period(i, pass->frame_count_mod);
 
+      if (!output.meta.name.empty())
+         chain->set_pass_name(i, output.meta.name.c_str());
+
+      // Preset overrides.
+      if (*pass->alias)
+         chain->set_pass_name(i, pass->alias);
+
       if (pass->filter == RARCH_FILTER_UNSPEC)
          pass_info.source_filter = filter;
       else
@@ -2129,6 +2208,14 @@ void vulkan_filter_chain_set_frame_count_period(
    chain->set_frame_count_period(pass, period);
 }
 
+void vulkan_filter_chain_set_pass_name(
+      vulkan_filter_chain_t *chain,
+      unsigned pass,
+      const char *name)
+{
+   chain->set_pass_name(pass, name);
+}
+
 void vulkan_filter_chain_build_offscreen_passes(
       vulkan_filter_chain_t *chain,
       VkCommandBuffer cmd, const VkViewport *vp)

gfx/drivers_shader/shader_vulkan.h

@@ -123,6 +123,10 @@ void vulkan_filter_chain_set_frame_count_period(vulkan_filter_chain_t *chain,
       unsigned pass,
       unsigned period);
 
+void vulkan_filter_chain_set_pass_name(vulkan_filter_chain_t *chain,
+      unsigned pass,
+      const char *name);
+
 void vulkan_filter_chain_build_offscreen_passes(vulkan_filter_chain_t *chain,
       VkCommandBuffer cmd, const VkViewport *vp);
 void vulkan_filter_chain_build_viewport_pass(vulkan_filter_chain_t *chain,