gamnit: intro two fingers motion service on EulerCamera

[nit.git] / lib / gamnit / flat.nit

diff --git a/lib/gamnit/flat.nit b/lib/gamnit/flat.nit
index 06ac8df..45d1ce9 100644 (file)
--- a/lib/gamnit/flat.nit
+++ b/lib/gamnit/flat.nit
@@ -52,7 +52,7 @@ class Sprite
        # Position of this sprite in world coordinates
        var center: Point3d[Float] is writable
 
-       # Rotation on the Z axis
+       # Rotation on the Z axis, where 0.0 points right and `0.5*pi` points up
        var rotation = 0.0 is writable
 
        # Mirror `texture` horizontally, inverting each pixel on the X axis
@@ -83,7 +83,7 @@ class Sprite
                simple_2d_program.color.array_enabled = false
                simple_2d_program.scale.array_enabled = false
 
-               simple_2d_program.translation.uniform(center.x, -center.y, center.z, 0.0)
+               simple_2d_program.translation.uniform(center.x, center.y, center.z, 0.0)
                simple_2d_program.color.uniform(tint[0], tint[1], tint[2], tint[3])
                simple_2d_program.scale.uniform scale
 
@@ -95,7 +95,7 @@ class Sprite
                        else texture.texture_coords, 2)
                simple_2d_program.coord.array(texture.vertices, 3)
 
-               simple_2d_program.rotation.uniform new Matrix.rotation(rotation, 0.0, 0.0, 1.0)
+               simple_2d_program.rotation.uniform new Matrix.rotation(rotation, 0.0, 0.0, -1.0)
 
                glDrawArrays(gl_TRIANGLE_STRIP, 0, 4)
        end
@@ -128,7 +128,7 @@ redef class App
        # UI sprites to draw in reference to `ui_camera`, over world `sprites`
        var ui_sprites: Sequence[Sprite] = new List[Sprite]
 
-       private var clock = new Clock
+       private var clock = new Clock is lazy
 
        redef fun on_create
        do
@@ -166,12 +166,11 @@ redef class App
                # Prepare to draw
                for tex in all_root_textures do
                        tex.load
+                       gamnit_error = tex.error
+                       if gamnit_error != null then print_error gamnit_error
 
                        glTexParameteri(gl_TEXTURE_2D, gl_TEXTURE_MIN_FILTER, gl_LINEAR)
                        glTexParameteri(gl_TEXTURE_2D, gl_TEXTURE_MAG_FILTER, gl_LINEAR)
-
-                       gamnit_error = tex.error
-                       assert gamnit_error == null else print_error gamnit_error
                end
        end