From 09d34c697a488a8450161c62a601b04748098d96 Mon Sep 17 00:00:00 2001
From: sanine-a <sanine.not@pm.me>
Date: Sat, 12 Dec 2020 21:55:48 -0600
Subject: add basic cairo bindings

---
 CMakeLists.txt       |  7 ++++--
 src/cairo_bindings.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/cairo_bindings.h | 21 ++++++++++++++++
 src/common.h         |  3 +++
 src/honey.c          |  2 ++
 src/honey.h          |  1 +
 6 files changed, 102 insertions(+), 2 deletions(-)
 create mode 100644 src/cairo_bindings.c
 create mode 100644 src/cairo_bindings.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index dc5807a..1b11d68 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,6 +15,7 @@ add_library(stb_image src/stb_image/stb_image.c)
 
 set(SOURCE_FILES
   src/main.c
+  src/cairo_bindings.c
   src/glm_bindings.c
   src/glm_vec3_bindings.c
   src/glm_vec4_bindings.c
@@ -29,10 +30,12 @@ set(SOURCE_FILES
   src/window.c)
   
 add_executable(honey ${SOURCE_FILES})
+
+set(LIBRARIES ${LUA_LIBRARIES} assimp glad cairo stb_image m)
 if (WIN32)
-  set(LIBRARIES ${LUA_LIBRARIES} assimp glfw3 opengl32 glad stb_image m)
+  set(LIBRARIES ${LIBRARIES} glfw3 opengl32)
 else()
-  set(LIBRARIES ${LUA_LIBRARIES} assimp glfw GL glad stb_image dl m)
+  set(LIBRARIES ${LIBRARIES} glfw GL dl)
 endif()
 target_link_libraries(honey ${LIBRARIES})
 
diff --git a/src/cairo_bindings.c b/src/cairo_bindings.c
new file mode 100644
index 0000000..95dea92
--- /dev/null
+++ b/src/cairo_bindings.c
@@ -0,0 +1,70 @@
+#include "cairo_bindings.h"
+#include "texture.h"
+
+int honey_cairo_mt_ref = LUA_NOREF;
+
+int honey_setup_cairo(lua_State* L)
+{
+    honey_lua_create_table
+        (L, 2,
+         HONEY_TABLE, "__index", 1,
+         HONEY_FUNCTION, "getTexture", honey_cairo_get_texture,
+
+         HONEY_FUNCTION, "__gc", honey_cairo_destroy);
+    honey_cairo_mt_ref = luaL_ref(L, LUA_REGISTRYINDEX);
+
+    lua_pushcfunction(L, honey_cairo_new);
+    lua_setfield(L, -2, "cairo");
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+int honey_cairo_new(lua_State* L)
+{
+    int width, height;
+    honey_lua_parse_arguments(L, 1, 2, HONEY_INTEGER, &width, HONEY_INTEGER, &height);
+
+    cairo_surface_t** surface = lua_newuserdata(L, sizeof(cairo_surface_t*));
+    *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
+
+    cairo_status_t status = cairo_surface_status(*surface);
+    if (status != CAIRO_STATUS_SUCCESS)
+        honey_lua_throw_error
+            (L, "libcairo error: %s", cairo_status_to_string(status));
+
+    lua_rawgeti(L, LUA_REGISTRYINDEX, honey_cairo_mt_ref);
+    lua_setmetatable(L, -2);
+
+    return 1;
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+int honey_cairo_get_texture(lua_State* L)
+{
+    /* todo
+    cairo_surface_t** surface;
+    honey_lua_parse_arguments(L, 1, 1, HONEY_USERDATA, &surface);
+
+    unsigned char* data = cairo_image_surface_get_data(*surface);
+    honey_texture* texture = lua_newuserdata(L, sizeof(honey_texture));
+
+    glGenTextures(1, &(texture->id));
+    glBindTexture(GL_TEXTURE_2D, texture->id);
+    */
+    return 1;
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+int honey_cairo_destroy(lua_State* L)
+{
+    cairo_surface_t** surface;
+    honey_lua_parse_arguments(L, 1, 1, HONEY_USERDATA, &surface);
+
+    cairo_surface_destroy(*surface);
+
+    return 0;
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
diff --git a/src/cairo_bindings.h b/src/cairo_bindings.h
new file mode 100644
index 0000000..f125879
--- /dev/null
+++ b/src/cairo_bindings.h
@@ -0,0 +1,21 @@
+#ifndef HONEY_CAIRO_H
+#define HONEY_CAIRO_H
+
+#include "common.h"
+
+/* @file cairo_bindings.h
+ * @brief Define some binding functions for creating and manipulating cairo surfaces,
+ * as well as enabling turning them into OpenGL textures.
+ */
+
+extern int honey_cairo_mt_ref;
+
+int honey_setup_cairo(lua_State* L);
+
+int honey_cairo_new(lua_State* L);
+
+int honey_cairo_get_texture(lua_State* L);
+
+int honey_cairo_destroy(lua_State* L);
+
+#endif
diff --git a/src/common.h b/src/common.h
index 7eac236..cb0ba45 100644
--- a/src/common.h
+++ b/src/common.h
@@ -34,6 +34,9 @@
 // stb image
 #include "stb_image/stb_image.h"
 
+// cairo
+#include <cairo/cairo.h>
+
 typedef GLFWwindow* honey_window;
 
 typedef struct {
diff --git a/src/honey.c b/src/honey.c
index fef75d7..793f5b5 100644
--- a/src/honey.c
+++ b/src/honey.c
@@ -129,6 +129,8 @@ bool honey_setup(lua_State** L)
 
     honey_setup_texture(*L);
 
+    honey_setup_cairo(*L);
+
     lua_pushcfunction(*L, honey_exit);
     lua_setfield(*L, -2, "exit");
 
diff --git a/src/honey.h b/src/honey.h
index 38a2562..11d0a2f 100644
--- a/src/honey.h
+++ b/src/honey.h
@@ -8,6 +8,7 @@
 
 #include "common.h"
 
+#include "cairo_bindings.h"
 #include "glm_bindings.h"
 #include "input.h"
 #include "mesh.h"
-- 
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