feat(engine): add framebuffer rendering commands & draw properties

1 files changed, 47 insertions, 1 deletions

diff --git a/engine/src/rendering.rs b/engine/src/rendering.rs
index cb6ec08..ffb5a4f 100644
--- a/engine/src/rendering.rs
+++ b/engine/src/rendering.rs
@@ -235,6 +235,14 @@ pub enum Command
         update: TextureUpdate,
     },
     RemoveTexture(ObjectId),
+    CreateFramebuffer(ObjectId),
+    RemoveFramebuffer(ObjectId),
+    UpdateFramebufferProperties
+    {
+        object_id: ObjectId,
+        properties: FramebufferProperties,
+        update_flags: FramebufferPropertiesUpdateFlags,
+    },
     CreateMesh
     {
         obj_id: ObjectId,
@@ -376,6 +384,12 @@ pub struct DrawProperties
     pub scissor_test_enabled: bool,
     pub scissor_box: ScissorBox,
     pub face_culling_enabled: bool,
+
+    /// `None` for default framebuffer
+    pub draw_framebuffer: Option<ObjectId>,
+
+    /// `None` for default framebuffer
+    pub read_framebuffer: Option<ObjectId>,
 }
 
 impl Default for DrawProperties
@@ -391,13 +405,15 @@ impl Default for DrawProperties
             scissor_test_enabled: false,
             scissor_box: ScissorBox::default(),
             face_culling_enabled: false,
+            draw_framebuffer: None,
+            read_framebuffer: None,
         }
     }
 }
 
 bitflags! {
     #[derive(Debug, Clone, Copy)]
-    pub struct DrawPropertiesUpdateFlags: usize
+    pub struct DrawPropertiesUpdateFlags: u16
     {
         const POLYGON_MODE_CONFIG = 1 << 0;
         const BLENDING_CONFIG = 1 << 1;
@@ -407,6 +423,8 @@ bitflags! {
         const SCISSOR_TEST_ENABLED = 1 << 5;
         const SCISSOR_BOX = 1 << 6;
         const FACE_CULLING_ENABLED = 1 << 7;
+        const DRAW_FRAMEBUFFER = 1 << 8;
+        const READ_FRAMEBUFFER = 1 << 9;
     }
 }
 
@@ -645,3 +663,31 @@ impl TexturePixelDataFormat
         }
     }
 }
+
+/// Index of a color texture attached to a framebuffer.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct FramebufferColorTextureIndex(pub u8);
+
+#[derive(Debug, Default, Clone)]
+#[non_exhaustive]
+pub struct FramebufferProperties
+{
+    pub depth_texture: Option<FramebufferTexture>,
+    pub color_draw_buffer: Option<FramebufferColorTextureIndex>,
+}
+
+bitflags! {
+    #[derive(Debug, Default, Clone)]
+    pub struct FramebufferPropertiesUpdateFlags: u8
+    {
+        const DEPTH_TEXTURE = 1 << 0;
+        const COLOR_DRAW_BUFFER = 1 << 1;
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct FramebufferTexture
+{
+    pub object_id: ObjectId,
+    pub mipmap_level: u16,
+}