Initial pipeline abstraction

Source/Render/Pipeline/PrimitiveState.rs

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+use super::{Face, FrontFace, PolygonMode, PrimitiveTopology};
+use crate::Render::IndexFormat;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, Default, Eq, PartialEq, Serialize, Deserialize)]
+pub struct PrimitiveState {
+    /// The primitive topology used to interpret vertices.
+    pub topology: PrimitiveTopology,
+
+    /// When drawing strip topologies with indices, this is the required format for the index buffer.
+    /// This has no effect on non-indexed or non-strip draws.
+    pub strip_index_format: Option<IndexFormat>,
+
+    /// The face to consider the front for the purpose of culling and stencil operations.
+    pub front_face: FrontFace,
+
+    /// The face culling mode.
+    pub cull_mode: Option<Face>,
+
+    /// Controls the way each polygon is rasterized. Can be either `Fill` (default), `Line` or `Point`
+    ///
+    /// Setting this to `Line` requires `Features::POLYGON_MODE_LINE` to be enabled.
+    ///
+    /// Setting this to `Point` requires `Features::POLYGON_MODE_POINT` to be enabled.
+    pub polygon_mode: PolygonMode,
+
+    /// If set to true, the polygon depth is clamped to 0-1 range instead of being clipped.
+    ///
+    /// Enabling this requires `Features::DEPTH_CLAMPING` to be enabled.
+    pub clamp_depth: bool,
+
+    /// If set to true, the primitives are rendered with conservative overestimation. I.e. any rastered pixel touched by it is filled.
+    /// Only valid for PolygonMode::Fill!
+    ///
+    /// Enabling this requires `Features::CONSERVATIVE_RASTERIZATION` to be enabled.
+    pub conservative: bool,
+}