working port from C++ to Lua with very basic shader and geometry functionality in place

src/binding/src/script_core.cpp

@@ -154,6 +154,9 @@ void register_core_function(sol::state& lua,sol::table& ns)
                                              ,"gray", image::LUM);
 
 
+    auto mathf_table = ns.create_named("mathf");
+    mathf_table.set_function("ping_pong",ping_pong<real_t>);
+
 }
 
 

src/binding/src/script_system.cpp

@@ -16,6 +16,7 @@ void register_system_function(sol::state&, sol::table &ns)
     ns.new_usertype<window>("window",
                             "update",&window::update,
                             "on_update",sol::writeonly_property(&window::set_on_update),
+                            "on_resize",sol::writeonly_property(&window::set_on_resize),
                             "title",sol::writeonly_property(&window::set_title),
                             "size",sol::property(&window::size,&window::set_size),
                             "client_size",sol::readonly_property(&window::client_size),

src/scripts/demos/simple_002.lua

@@ -23,12 +23,13 @@ g.topology = pw.geometry.triangles -- meh
 
 g.vertices:clear()
 
-z = 1.0
+z = -5.0
+s = 2
 
-g.vertices:add(pw.vector3:new(-1, 1, z)) -- 0
-g.vertices:add(pw.vector3:new(-1,-1, z)) -- 1
-g.vertices:add(pw.vector3:new( 1,-1, z)) -- 2
-g.vertices:add(pw.vector3:new( 1, 1, z)) -- 3
+g.vertices:add(pw.vector3:new(-s, s, z)) -- 0
+g.vertices:add(pw.vector3:new(-s,-s, z)) -- 1
+g.vertices:add(pw.vector3:new( s,-s, z)) -- 2
+g.vertices:add(pw.vector3:new( s, s, z)) -- 3
 
 -- 0 --- 3
 -- |  \  |
@@ -84,16 +85,33 @@ if not renderer:create(g) then
     print("couldn't create renderer")
 end
 
+local cam_z = 0
+local cam_x = 0
+
+w.on_resize = function(self)
+    print(self.client_size.width,self.client_size.height)
+end
+
 -- setup a lua callback function as callback
 w.on_update = function(self)
 
+    -- set identity on model matrix
     mm:set_identity()
+    -- set view matrix with look_at
+    mv = pw.matrixtransform.look_at(pw.vector3:new(cam_x,0,cam_z),pw.vector3.forward(),pw.vector3.up())
 
-    mv = pw.matrixtransform.look_at(pw.vector3:new(0,0,0),pw.vector3.forward(),pw.vector3.up())
-    mp = pw.matrixtransform.perspective_projection(1.3,1.0,0.2,100)
+    -- compute aspect ratio from canvas size
+    aspect_ratio = self.client_size.width / self.client_size.height
 
-    local cl = pw.vector4:new( 1.0, 0.0, 0.0, 1.0 )
+    -- create a view frustom for a perspective projection
+    mp = pw.matrixtransform.perspective_projection(1.3,aspect_ratio,0.2,100)
 
+    -- just some toying around
+    local color_red  = pw.mathf.ping_pong(pw.time.now,1.0)
+    local color_blue = 1.0 - pw.mathf.ping_pong(pw.time.now,1.0)
+    local cl = pw.vector4:new( color_red, 0.0, color_blue, 1.0 )
+
+    -- bind the shader
     s:use()
 
     s:set_uniform_mat4("model",mm)
@@ -101,26 +119,45 @@ w.on_update = function(self)
     s:set_uniform_mat4("projection",mp)
     s:set_uniform_vec4("color",cl)
 
+    -- draw
     renderer:draw()
 
 end
 
+-- before entering the update loop make the window visible
 w.visible = true
 
+-- main update loop
 while w:update() do
 
     -- somehow works
-    if (pw.input.get().input_string == 'f') then
+    if pw.input.get().input_string == 'f' then
         w.fullscreen = not w.fullscreen
     end
 
     -- keycode for quit
-    if (pw.input.get().input_string == 'q') then
+    if pw.input.get().input_string == 'q' then
         break;
     end
 
+    -- just to quickly modify speed
+    local move_step = 0.05
+
+    -- camera
+    if     pw.input.get().input_string == 'w' then
+        cam_z = cam_z - move_step
+    elseif pw.input.get().input_string == 's' then
+        cam_z = cam_z + move_step
+        print(cam_z)
+    elseif pw.input.get().input_string == 'a' then
+        cam_x = cam_x - move_step
+    elseif pw.input.get().input_string == 'd' then
+        cam_x = cam_x + move_step
+        print(cam_x)
+    end
+
     -- just to check
-    if (pw.input:get().mouse_button == 1) then
+    if pw.input:get().mouse_button == 1 then
 
         print("elapsed",t.elapsed)
             t:reset()

src/system/include/pw/system/window.hpp

@@ -12,7 +12,8 @@ namespace pw {
 class window {
 public:
 
-    typedef std::function<void(window&)> on_update_t;
+    using on_update_t = std::function<void(window&)> ;
+    using on_resize_t = std::function<void(window&)> ;
 
     window();
     ~window();
@@ -34,6 +35,7 @@ public:
     void set_fullscreen(bool use_fullscreen);
 
     void set_on_update(on_update_t f) { _on_update = f; }
+    void set_on_resize(on_resize_t f) { _on_resize = f; }
 
     bool visible() const;
     void set_visible(bool is_visible);
@@ -43,6 +45,7 @@ protected:
 	std::unique_ptr<impl> _impl;
 
     on_update_t _on_update;
+    on_resize_t _on_resize;
 
 
 };

src/system/src/window.cpp

@@ -104,13 +104,14 @@ struct window::impl {
     static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     {
         window::impl* impl = static_cast<window::impl*>(glfwGetWindowUserPointer(window));
+        impl->_parent._on_resize(impl->_parent);
 
-        debug::d() << "window::frame_buffer_size_callback " << width << "x" << height;
+//        debug::d() << "window::frame_buffer_size_callback " << width << "x" << height;
 
         //        impl->on_resize(width,height);
 
         //		std::cout << "framebuffer " << width << "x" << height << std::endl;
-        //	glViewport(0, 0, width, height);
+//            glViewport(0, 0, width, height);
     }
 
     void update_display_list()
@@ -190,7 +191,7 @@ struct window::impl {
 
         glfwSetWindowUserPointer(_window,this);
 
-        //glfwSetFramebufferSizeCallback(_window, window::impl::framebuffer_size_callback);
+        glfwSetFramebufferSizeCallback(_window, window::impl::framebuffer_size_callback);
         glfwSetKeyCallback(_window, window::impl::key_callback);
         //        glfwSetCharCallback(_window, character_callback);
         glfwSetCharModsCallback(_window, charmods_callback);
@@ -314,6 +315,7 @@ struct window::impl {
 window::window()
     : _impl(std::make_unique<window::impl>(*this))
     , _on_update([](window&){})
+    , _on_resize([](window&){})
 {
 }
 

src/visual/include/pw/visual/context.hpp

@@ -24,21 +24,47 @@
 #ifndef PW_VISUAL_CONTEXT_HPP
 #define PW_VISUAL_CONTEXT_HPP
 
+#include <pw/core/point.hpp>
 #include <pw/core/size.hpp>
+#include <pw/core/vector.hpp>
+
 
 namespace pw {
 
 class context {
 public:
 
-	virtual bool make_current() = 0;
-	virtual void resize() = 0;
-    virtual ::pw::size size() = 0;
-	virtual void flush() = 0;
+    context();
+    ~context();
 
-	virtual ~context() = default;
+    void set_blend();
+    void set_depth();
+
+    void set_viewport(point const &p, size const &s);
+    size viewport_size() const;
+    point viewport_origin() const;
+
+    void set_clearcolor(vector4f const& c);
+
+    void clear();
+
+protected:
+    struct impl;
+    std::unique_ptr<impl> _impl;
 };
 
+
+//class context {
+//public:
+
+//	virtual bool make_current() = 0;
+//	virtual void resize() = 0;
+//    virtual ::pw::size size() = 0;
+//	virtual void flush() = 0;
+
+//	virtual ~context() = default;
+//};
+
 }
 
 #endif

src/visual/src/context.cpp

@@ -0,0 +1,46 @@
+#include "pw/visual/context.hpp"
+
+#include "glad/glad.h"
+
+
+namespace pw {
+
+struct context::impl {
+    void set_viewport(const point &p, const size &s)
+    {
+        glViewport(p.x,p.y,s.width,s.height);
+    }
+
+    void clear()
+    {
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    }
+};
+
+context::context()
+    : _impl(std::make_unique<impl>())
+{
+}
+
+context::~context()
+{
+}
+
+void context::set_blend()
+{
+
+}
+
+void context::set_viewport(const point &p, const size &s)
+{
+    _impl->set_viewport(p,s);
+}
+
+void context::clear()
+{
+    _impl->clear();
+}
+
+}
+
+

src/visual/src/renderer.cpp

@@ -162,4 +162,20 @@ void renderer::draw()
 }
 
 
+//class viewport {
+
+
+
+//    void set(point p,size s);
+
+
+
+//protected:
+
+//    struct _impl;
+//    std::unique_ptr<_impl>;
+
+//};
+
+
 }