feat(engine): add blending to renderer draw properties

1 files changed, 89 insertions, 0 deletions

diff --git a/engine/src/renderer/blending.rs b/engine/src/renderer/blending.rs
new file mode 100644
index 0000000..9ae2f82
--- /dev/null
+++ b/engine/src/renderer/blending.rs
@@ -0,0 +1,89 @@
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Config
+{
+    pub source_factor: Factor,
+    pub destination_factor: Factor,
+    pub equation: Equation,
+}
+
+impl Default for Config
+{
+    fn default() -> Self
+    {
+        Self {
+            source_factor: Factor::One,
+            destination_factor: Factor::Zero,
+            equation: Equation::default(),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[non_exhaustive]
+pub enum Factor
+{
+    /// Factor will be the RGBA color `(0,0,0,0)`
+    Zero,
+
+    /// Factor will be the RGBA color `(1,1,1,1)`
+    One,
+
+    /// Factor will be the source color
+    SrcColor,
+
+    /// Factor will be the RGBA color `(1,1,1,1) - source color`
+    OneMinusSrcColor,
+
+    /// Factor will be the destination color
+    DstColor,
+
+    /// Factor will be the RGBA color `(1,1,1,1) - destination color`
+    OneMinusDstColor,
+
+    /// Factor will be the alpha component of the source color.
+    SrcAlpha,
+
+    /// Factor will be the RGBA color `(1,1,1,1) - source color alpha`
+    OneMinusSrcAlpha,
+
+    /// Factor will be the alpha component of the destination color.
+    DstAlpha,
+
+    /// Factor will be the RGBA color `(1,1,1,1) - destination color alpha`
+    OneMinusDstAlpha,
+
+    /// Factor will be the constant color
+    ConstantColor,
+
+    /// Factor will be the RGBA color `(1,1,1,1) - constant color`
+    OneMinusConstantColor,
+
+    /// Factor will be the alpha component of the constant color.
+    ConstantAlpha,
+
+    /// Factor will be the RGBA color `(1,1,1,1) - constant color alpha`
+    OneMinusConstantAlpha,
+}
+
+#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
+pub enum Equation
+{
+    /// The destination color and source color is added to each other in the blend
+    /// function
+    #[default]
+    Add,
+
+    /// The destination color is subtracted from the source color in the blend function
+    Subtract,
+
+    /// The source color is subtracted from the destination color in the blend function
+    ReverseSubtract,
+
+    /// The blend function will take the component-wise minimum of the destination color
+    /// and the source color
+    Min,
+
+    /// The blend function will take the component-wise maximum of the destination color
+    /// and the source color
+    Max,
+}