text almost works

shaders/text.frag

@@ -21,6 +21,5 @@ layout(location = 0) in vec2 tex_coords;
 layout(location = 0) out vec4 out_color;
 
 void main() {
-    out_color = vec4(1., 1., 1., 1.);
-    // out_color = vec4(1., 1., 1., texture(diffuse_tex, tex_coords).r);
+    out_color = vec4(1., 1., 1., texture(diffuse_tex, tex_coords).r);
 }

shaders/text.vert

@@ -25,8 +25,15 @@ out gl_PerVertex {
 };
 
 void main() {
+    mat4 invert = mat4(
+        1., 0., 0., 0.,
+        0., -1., 0., 0.,
+        0., 0., 1., 0.,
+        0., 0., 0., 1.
+    );
+
     // Vertex position in camera
-    gl_Position = ubo.projection * ubo.view * push.model * vec4(position, 1.0);
+    gl_Position = ubo.projection * ubo.view * invert * push.model * vec4(position, 1.0);
 
     // Just interpolate UV coords, no transformation needed
     tex_coords = uv;