some old changes

.vscode/settings.json

@@ -1,3 +1,4 @@
 {
-    "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools"
+    "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools",
+    "cmake.configureOnOpen": true
 }

CMakeLists.txt

@@ -9,7 +9,7 @@ project(pixwerx)
 #
 # pixwerx ist C++17
 #
-set (CMAKE_CXX_STANDARD 17)
+set (CMAKE_CXX_STANDARD 23)
 
 # internal cmake modules
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/etc/cmake ${CMAKE_MODULE_PATH})

src/core/include/pw/core/matrix_transform.hpp

@@ -39,7 +39,7 @@ struct matrix_transform {
     }
 
 	inline static
-	matrix_<4,4,T> perspective_frustum(const T &left,const T &right,
+    matrix_<4,4,T> perspective_frustum_rh(const T &left,const T &right,
 									   const T &bottom,const T &top,
 									   const T &z_near,const T &z_far)
 	{
@@ -58,6 +58,46 @@ struct matrix_transform {
 		return frustum;
 	}
 
+
+//    /// creates a projection from a frustum planes with a reversed depth mapped to [0..1]
+//    pub fn make_projection_rh_from_frustum_reversed(
+//        left: f32,
+//        right: f32,
+//        bottom: f32,
+//        top: f32,
+//        z_near: f32,
+//        z_far: f32,
+//    ) -> Mat4 {
+//        assert!(z_near > 0.0 && z_far > 0.0);
+
+//        // info!("near {:?}", z_near);
+
+//        //
+//        // reversed z 0..1 projection
+//        //
+//        let a = (right + left) / (right - left); // position in frame horizontal
+//        let b = (top + bottom) / (top - bottom); // position in frame vertical
+
+//        let c = z_near / (z_far - z_near); // lower bound
+//        let d = z_far * z_near / (z_far - z_near); // upper bound
+
+//        let sx = 2.0 * z_near / (right - left); // scale x
+//        let sy = 2.0 * z_near / (top - bottom); // scale y
+
+//        // reverse z 0..1
+//        // --------------
+//        // sx   0   a   0
+//        // 0    sy  b   0
+//        // 0    0   c   d
+//        // 0    0  -1   0
+
+//        Mat4::from_cols(
+//            Vec4::new(sx,   0.0,    0.0,    0.0),
+//            Vec4::new(0.0,  sy,     0.0,    0.0),
+//            Vec4::new(a,    b,      c,     -1.0),
+//            Vec4::new(0.0,  0.0,    d,      0.0),
+//        )
+//    }
 	inline static
 	matrix_<4,4,T> perspective_projection(const T &field_of_view,
 										  const T &aspect_ratio,
@@ -69,7 +109,7 @@ struct matrix_transform {
 		const auto top = right / aspect_ratio;
 		const auto bottom = -top;
 
-		return perspective_frustum(left,right,
+        return perspective_frustum_rh(left,right,
 								   bottom,top,
 								   z_near,z_far);
 	}

src/deps/CMakeLists.txt

@@ -1,10 +1,9 @@
 
-set(GLFW_BUILD_EXAMPLES TRUE CACHE BOOL "Build the GLFW example programs" FORCE)
+set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "Build the GLFW example programs" FORCE)
 set(GLFW_BUILD_TESTS  OFF CACHE BOOL "Build the GLFW test programs" FORCE)
 set(GLFW_BUILD_DOCS OFF CACHE BOOL "Build the GLFW documentation" FORCE)
 set(GLFW_INSTALL OFF CACHE BOOL "Generate installation target" FORCE)
 
-#add_subdirectory(glfw-3.2.1)
 
 add_subdirectory(glfw-3.3.5)
 add_subdirectory(lua-5.4.2)

src/scripts/demos/simple_004.lua

@@ -54,9 +54,14 @@ g.texture_coordinates = { {
     { 0.0, 1.0 }
 } }
 
-z = -5.0
+z = 0
 s = 1
 
+
+-- 0 --- 3
+-- |  \  |
+-- 1 --- 2
+
 -- indices
 g.indices = {
     0, 1, 2,    -- triangle #1
@@ -74,10 +79,6 @@ g.vertices = {
     { -s, s, z }
 }
 
--- 0 --- 3
--- |  \  |
--- 1 --- 2
-
 g:compute_normals()
 
 
@@ -131,7 +132,7 @@ end
 local renderer = pw.renderer()
 
 -- camera position
-local cam_pos = pw.vector3(0,0,0)
+local cam_pos = pw.vector3(0,0,5)
 
 -- model position
 local model_pos = pw.vector3(0,0,0)
@@ -197,7 +198,7 @@ w.on_update = function(self)
     s:set_uniform_vec4("color",cl)
 
     -- specific to our shader
-    s:set_uniform_int("tex_color",0)
+	s:set_uniform_int("tex_color",0) -- unit 0
 
     -- bind the texture
     tx:bind()
@@ -228,7 +229,7 @@ while w:update() do
     if pw.input.get().has_input then
 
 
-        -- somehow works
+        -- somehow (depending on X11/Wayland) works
         if pw.input.get().input_string == 'f' then
             w.fullscreen = not w.fullscreen
         end