feat(engine): add face culling mode to rendering::DrawProperties

2 files changed, 30 insertions, 2 deletions

diff --git a/engine/src/rendering.rs b/engine/src/rendering.rs
index 1bb11cc..524c617 100644
--- a/engine/src/rendering.rs
+++ b/engine/src/rendering.rs
@@ -384,6 +384,7 @@ pub struct DrawProperties
     pub scissor_test_enabled: bool,
     pub scissor_box: ScissorBox,
     pub face_culling_enabled: bool,
+    pub face_culling_mode: FaceCullingMode,
 
     /// `None` for default framebuffer
     pub draw_framebuffer: Option<ObjectId>,
@@ -405,6 +406,7 @@ impl Default for DrawProperties
             scissor_test_enabled: false,
             scissor_box: ScissorBox::default(),
             face_culling_enabled: false,
+            face_culling_mode: FaceCullingMode::default(),
             draw_framebuffer: None,
             read_framebuffer: None,
         }
@@ -423,11 +425,23 @@ 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;
+        const FACE_CULLING_MODE = 1 << 8;
+        const DRAW_FRAMEBUFFER = 1 << 9;
+        const READ_FRAMEBUFFER = 1 << 10;
     }
 }
 
+#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum FaceCullingMode
+{
+    Front,
+
+    #[default]
+    Back,
+
+    FrontAndBack,
+}
+
 #[derive(Debug, Clone)]
 #[non_exhaustive]
 pub enum TextureCreation
diff --git a/engine/src/rendering/backend/opengl.rs b/engine/src/rendering/backend/opengl.rs
index 32afd8f..25583b5 100644
--- a/engine/src/rendering/backend/opengl.rs
+++ b/engine/src/rendering/backend/opengl.rs
@@ -50,10 +50,12 @@ use opengl_bindings::misc::{
     get_viewport as gl_get_viewport,
     set_depth_function as gl_set_depth_function,
     set_enabled,
+    set_face_culling_mode as gl_set_face_culling_mode,
     set_viewport as gl_set_viewport,
     BufferClearMask as GlBufferClearMask,
     Capability,
     DepthFunction as GlDepthFunction,
+    FaceCullingMode as GlFaceCullingMode,
 };
 use opengl_bindings::shader::{
     Error as GlShaderError,
@@ -126,6 +128,7 @@ use crate::rendering::{
     DrawMeshOptions,
     DrawProperties,
     DrawPropertiesUpdateFlags,
+    FaceCullingMode,
     FramebufferProperties,
     FramebufferPropertiesUpdateFlags,
     GraphicsProperties,
@@ -1388,6 +1391,17 @@ fn update_draw_properties(
         );
     }
 
+    if update_flags.contains(DrawPropertiesUpdateFlags::FACE_CULLING_MODE) {
+        gl_set_face_culling_mode(
+            gl_context,
+            match properties.face_culling_mode {
+                FaceCullingMode::Front => GlFaceCullingMode::Front,
+                FaceCullingMode::Back => GlFaceCullingMode::Back,
+                FaceCullingMode::FrontAndBack => GlFaceCullingMode::FrontAndBack,
+            },
+        );
+    }
+
     'if_draw_fb: {
         if update_flags.contains(DrawPropertiesUpdateFlags::DRAW_FRAMEBUFFER) {
             let Some(framebuffer_obj_id) = properties.draw_framebuffer else {