ability to specify the face of the cube map in frame buffer attachment

fyrox-graphics-gl/src/framebuffer.rs

@@ -53,6 +53,7 @@ unsafe fn set_attachment(
     gl_attachment_kind: u32,
     texture: &GlTexture,
     level: i32,
+    cube_map_face: Option<CubeMapFace>,
 ) {
     match texture.kind() {
         GpuTextureKind::Line { .. } => {
@@ -76,7 +77,7 @@ unsafe fn set_attachment(
             server.gl.framebuffer_texture_2d(
                 glow::FRAMEBUFFER,
                 gl_attachment_kind,
-                glow::TEXTURE_CUBE_MAP_POSITIVE_X,
+                cube_map_face.map_or(glow::TEXTURE_CUBE_MAP_POSITIVE_X, |face| face.into_gl()),
                 Some(texture.id()),
                 level,
             );
@@ -123,6 +124,7 @@ impl GlFrameBuffer {
                     depth_attachment_kind,
                     texture,
                     depth_attachment.level as i32,
+                    depth_attachment.cube_map_face,
                 );
             }
 
@@ -140,6 +142,7 @@ impl GlFrameBuffer {
                     color_attachment_kind,
                     texture,
                     color_attachment.level as i32,
+                    color_attachment.cube_map_face,
                 );
                 color_buffers.push(color_attachment_kind);
             }

fyrox-graphics/src/framebuffer.rs

@@ -58,6 +58,8 @@ pub struct Attachment {
     pub texture: GpuTexture,
     /// Mip level of the texture. In most cases, it can be zero.
     pub level: usize,
+    /// Face of the cube map, this field is used only if the `texture` is a cube map.
+    pub cube_map_face: Option<CubeMapFace>,
 }
 
 impl Attachment {
@@ -67,6 +69,7 @@ impl Attachment {
             kind: AttachmentKind::Color,
             texture,
             level: 0,
+            cube_map_face: None,
         }
     }
 
@@ -76,6 +79,18 @@ impl Attachment {
             kind: AttachmentKind::Color,
             texture,
             level,
+            cube_map_face: None,
+        }
+    }
+
+    /// Creates a new [`AttachmentKind::Color`] attachment with the given texture and the cube map
+    /// face. The texture must be a cube map.
+    pub fn color_with_face(texture: GpuTexture, cube_map_face: CubeMapFace) -> Self {
+        Self {
+            kind: AttachmentKind::Color,
+            texture,
+            level: 0,
+            cube_map_face: Some(cube_map_face),
         }
     }
 
@@ -85,6 +100,7 @@ impl Attachment {
             kind: AttachmentKind::Depth,
             texture,
             level: 0,
+            cube_map_face: None,
         }
     }
 
@@ -94,6 +110,7 @@ impl Attachment {
             kind: AttachmentKind::DepthStencil,
             texture,
             level: 0,
+            cube_map_face: None,
         }
     }
 }