Add Rectangle Rendering

src/presenter.cpp

@@ -27,7 +27,6 @@ void Presenter::initialize()
         );
 
     // --- BEGIN test_box ---
-
     com::Folder* const test_box = gfx::object_system()->insert_object(
             { "maker", "test_box" },
             gfx::shader_generators()->insert_shader_forward_uniform_color(),
@@ -46,6 +45,20 @@ void Presenter::initialize()
 
     // --- END test_box ---
 
+    com::Folder * const test_rect = gfx::object_system()->insert_object(
+            { "maker", "test_rect" },
+            gfx::shader_generators()->insert_shader_forward_uniform_color_ui(),
+            gfx::buffer_generators()->insert_procedural_rectangle({ 2.0f, 2.0f }, "test_rect", { "maker" })
+    );
+    gfx::object_system()->push_frame_back(
+        test_rect,
+        root()->push_back<com::Folder>("text_rect")->push_back<com::Frame>()
+    );
+    gfx::object_system()->get_uniforms(test_rect)->push_back<com::FileVec3>("material_ambient_color", vec3{ 0.75f, 0.75f, 0 });
+    gfx::object_system()->get_uniforms(test_rect)->push_back<com::FileMat4x4>("view_matrix", mat4x4{1.0f});
+    gfx::object_system()->get_uniforms(test_rect)->push_back<com::FileMat4x4>("model_matrix", mat4x4{1.0f});
+    gfx::object_system()->get_uniforms(test_rect)->push_back<com::FileMat4x4>("projection_matrix", glm::ortho(0, 320, 240, 0, -1, 1));
+
     // --- BEGIN directional light ---
 
     com::Frame* const frame_light = root()->push_back<com::Folder>("directional_light")->push_back<com::Frame>();
@@ -66,6 +79,7 @@ void Presenter::release()
     osi::presenters()->find<com::Folder>("maker")->erase(self_name() + ".link");
 
     root()->erase("test_box");
+    root()->erase("test_rect");
 }
 
 void Presenter::next_round()

[Marek Trtík]

You do not need to set Model/View/Projection matrices as they are fetched automatically from Frame instances. Namely, Model matrix will be taken from the frame you create on the line 53. View and projection matrices will be fetched from the active camera. To setup "screen-space" rendering you only need to make the frame of the active camera to be parent of the frame created at line 53. To do so, you insert com::Link named by https://gitlab.fi.muni.cz/qtrtik/age_libraries/-/blob/main/com/include/com/frame.hpp?ref_type=heads#L18 referencing the frame of the camera.

[Marek Trtík]

You should not use GLM directly, because if the math library is changed (see the library selection at ttps://gitlab.fi.muni.cz/qtrtik/age_libraries/-/blob/main/math/include/math/math.hpp?ref_type=heads#L11 ) then your code won't compile.

Perspective/orthographic projection is already defined in Camera: https://gitlab.fi.muni.cz/qtrtik/age_libraries/-/blob/main/gfx/include/gfx/camera.hpp?ref_type=heads#L38