From 42a52962075b611e0a393c3cc74d9b7a11196afb Mon Sep 17 00:00:00 2001
From: Sam Hocevar <sam@hocevar.net>
Date: Mon, 12 Jan 2015 02:47:44 +0000
Subject: [PATCH] gpu: use PEGTL to split lolfx files into different parts.

---
 src/gpu/shader.cpp            | 125 ++++++++++++++++++++++------------
 src/lol/gpu/shader.h          |   2 +-
 src/platform/sdl/sdlinput.cpp |   4 +-
 3 files changed, 84 insertions(+), 47 deletions(-)

diff --git a/src/gpu/shader.cpp b/src/gpu/shader.cpp
index 50e80e6c..6936ddc7 100644
--- a/src/gpu/shader.cpp
+++ b/src/gpu/shader.cpp
@@ -29,6 +29,8 @@
 #   undef far /* Fuck Microsoft again */
 #endif
 
+#include "pegtl.hh"
+
 #include "lolgl.h"
 
 namespace lol
@@ -116,64 +118,97 @@ hash<char const *> ShaderData::Hash;
 int ShaderData::nshaders = 0;
 
 /*
- * Public Shader class
+ * LolFx parser
  */
 
-Shader *Shader::Create(String const &name, String const &code)
+using namespace pegtl;
+
+struct lolfx_parser
 {
-    String src = String("\n") + code;
+public:
+    lolfx_parser(String const &code)
+      : m_section("header")
+    {
+        basic_parse_string<struct lolfx>(std::string(code.C()), this);
+    }
 
-    /* Parse the crap */
-    array<char const *, char const *> sections;
-    char *key = nullptr;
-    for (char *parser = src.C(); *parser; )
+public:
+    String m_section;
+    map<String, String> m_programs;
+
+private:
+    struct do_title : action_base<do_title>
     {
-        if (key == nullptr && (parser[0] == '\n' || parser[0] == '\r')
-             && parser[1] == '[')
+        static void apply(std::string const &ctx, lolfx_parser *that)
         {
-            *parser = '\0';
-            parser += 2;
-            key = parser;
+            that->m_section = ctx.c_str();
         }
-        else if (key && parser[0] == ']')
-        {
-            *parser++ = '\0';
-        }
-        else if (key && (parser[0] == '\n' || parser[0] == '\r'))
-        {
-            sections.Push(key, parser);
-            parser++;
-            key = nullptr;
-        }
-        else
+    };
+
+    struct do_code : action_base<do_code>
+    {
+        static void apply(std::string const &ctx, lolfx_parser *that)
         {
-            parser++;
+            that->m_programs[that->m_section] = ctx.c_str();
         }
+    };
+
+    // title <- '[' (!']')+ ']' .{eol}
+    struct title
+      : seq<one<'['>,
+            ifapply<plus<not_one<']'>>, do_title>,
+            one<']'>,
+            until<eol, any>> {};
+
+    // FIXME: I’m using this rule because the ifapply<> above also
+    // gets triggered when using at<> which is non-consuming.
+    struct title_ignore
+      : seq<one<'['>,
+            plus<not_one<']'>>,
+            one<']'>,
+            until<eol, any>> {};
+
+    // code_line <- .{eol}
+    struct code_line
+      : until<eol, any> {};
+
+    // code_section < code_line{&(title / eof)}
+    struct code_section
+      : ifapply<until<at<sor<title_ignore, eof>>, code_line>, do_code> {};
+
+    // shader < title code_section
+    struct shader
+      : seq<title, code_section> {};
+
+    // header < code_section
+    struct header
+      : code_section {};
+
+    // lolfx < header code_section*
+    struct lolfx
+      : seq<header, star<shader>> {};
+};
+
+/*
+ * Public Shader class
+ */
+
+Shader *Shader::Create(String const &name, String const &code)
+{
+    lolfx_parser p(code);
+
+    if (!p.m_programs.HasKey("vert.glsl"))
+    {
+        ASSERT(false, "no vertex shader found in %s", name.C());
     }
 
-    char const *vert = nullptr, *frag = nullptr;
-    for (int i = 0; i < sections.Count(); i++)
+    if (!p.m_programs.HasKey("frag.glsl"))
     {
-#if !defined __CELLOS_LV2__ && !defined _XBOX && !defined USE_D3D9
-        if (!strcmp(sections[i].m1, "vert.glsl"))
-            vert = sections[i].m2;
-        if (!strcmp(sections[i].m1, "frag.glsl"))
-            frag = sections[i].m2;
-#else
-        if (!strcmp(sections[i].m1, "vert.hlsl"))
-            vert = sections[i].m2;
-        if (!strcmp(sections[i].m1, "frag.hlsl"))
-            frag = sections[i].m2;
-#endif
+        ASSERT(false, "no fragment shader found in %s", name.C());
     }
 
-    /* FIXME: we don’t know how to handle these yet. */
-    if (!vert)
-        Log::Error("no vertex shader found in %s… sorry, I’m gonna crash now.\n",
-                   name.C());
-    if (!frag)
-        Log::Error("no fragment shader found in %s… sorry, I’m gonna crash now.\n",
-                   name.C());
+    String vert = p.m_programs["vert.glsl"];
+    String frag = p.m_programs["frag.glsl"];
 
     uint32_t new_vert_crc = ShaderData::Hash(vert);
     uint32_t new_frag_crc = ShaderData::Hash(frag);
@@ -201,7 +236,7 @@ void Shader::Destroy(Shader *shader)
 }
 
 Shader::Shader(String const &name,
-               char const *vert, char const *frag)
+               String const &vert, String const &frag)
   : data(new ShaderData())
 {
     data->m_name = name;
diff --git a/src/lol/gpu/shader.h b/src/lol/gpu/shader.h
index c7598285..4b7b4446 100644
--- a/src/lol/gpu/shader.h
+++ b/src/lol/gpu/shader.h
@@ -171,7 +171,7 @@ public:
     void Unbind() const;
 
 protected:
-    Shader(String const &name, char const *vert, char const *frag);
+    Shader(String const &name, String const &vert, String const &frag);
     ~Shader();
 
 private:
diff --git a/src/platform/sdl/sdlinput.cpp b/src/platform/sdl/sdlinput.cpp
index fea2d313..3a0ea5e5 100644
--- a/src/platform/sdl/sdlinput.cpp
+++ b/src/platform/sdl/sdlinput.cpp
@@ -65,7 +65,9 @@ private:
     static ivec2 GetMousePos();
     static void SetMousePos(ivec2 position);
 
-    SdlInputData(int app_w, int app_h, int screen_w, int screen_h) :
+    SdlInputData(int app_w, int app_h, int screen_w, int screen_h)
+      : m_mouse(nullptr),
+        m_keyboard(nullptr),
         m_prevmouse(ivec2::zero),
         m_app(vec2((float)app_w, (float)app_h)),
         m_screen(vec2((float)screen_w, (float)screen_h)),