gradient texture

rust/lightwave/README.md

@@ -108,8 +108,8 @@ Progress: About 90% ([LWO2 Spec](http://static.lightwave3d.com/sdk/2015/html/fil
 Ordinal Strings:
 * ✅ [Image Texture Map](#image-texture-map) `IMAP`
 * ❌ [Procedural Texture](#procedural-texture) `PROC`
-* ❌ [Gradient Texture](#gradient-texture) `GRAD`
-* ❌ Shader Plugin `SHDR`
+* ✅ [Gradient Texture](#gradient-texture) `GRAD`
+* ✅ [Shader Plugin](#shaders) `SHDR`
 
 #### Shared
 
@@ -158,16 +158,16 @@ Ordinal Strings:
 
 | Chunk          | Tag               | Status |
 |----------------|-------------------|--------|
-| Parameter Name | `PNAM`            | ❌      |
-| Item Name      | `INAM`            | ❌      |
-| Gradient Range | `GRST`<br>`GREN`  | ❌      |
-| Repeat Mode    | `GRPT`            | ❌      |
-| Key Values     | `FKEY`            | ❌      |
-| Key Parameters | `IKEY`            | ❌      |
+| Parameter Name | `PNAM`            | ✅      |
+| Item Name      | `INAM`            | ✅      |
+| Gradient Range | `GRST`<br>`GREN`  | ✅      |
+| Repeat Mode    | `GRPT`            | ✅      |
+| Key Values     | `FKEY`            | ✅      |
+| Key Parameters | `IKEY`            | ✅      |
 
 #### Shaders
 
 
 | Chunk            | Tag    | Status |
 |------------------|--------|--------|
-| Shader Algorithm | `FUNC` | ❌      |
+| Shader Algorithm | `FUNC` | ✅      |

rust/lightwave/src/lwo2/sub_tags/blocks/gradient_texture.rs

@@ -0,0 +1,68 @@
+use crate::iff::SubChunk;
+use crate::lwo2::sub_tags::Name;
+use binrw::binread;
+
+#[binread]
+#[derive(Debug)]
+pub enum GradientTextureSubChunk {
+    #[br(magic(b"PNAM"))]
+    ParameterName(SubChunk<Name>),
+    #[br(magic(b"INAM"))]
+    ItemName(SubChunk<Name>),
+    #[br(magic(b"GRST"))]
+    GradientRangeStart(SubChunk<GradientRange>),
+    #[br(magic(b"GREN"))]
+    GradientRangeEnd(SubChunk<GradientRange>),
+    #[br(magic(b"GRPT"))]
+    RepeatMode(SubChunk<RepeatMode>),
+    #[br(magic(b"FKEY"))]
+    KeyValues(SubChunk<KeyValues>),
+    #[br(magic(b"IKEY"))]
+    KeyParameters(SubChunk<KeyParameters>),
+}
+
+/// The repeat mode. This is currently undefined.
+#[binread]
+#[br(import(length: u32))]
+#[derive(Debug)]
+pub struct KeyParameters {
+    #[br(count = length / 2)]
+    pub repeat_mode: Vec<u16>,
+}
+
+/// The transfer function is defined by an array of keys, each with an input value and an RGBA
+/// output vector. Given an input value, the gradient can be evaluated by selecting the keys whose
+/// positions bracket the value and interpolating between their outputs. If the input value is lower
+/// than the first key or higher than the last key, the gradient value is the value of the closest
+/// key.
+#[binread]
+#[br(import(length: u32))]
+#[derive(Debug)]
+pub struct KeyValues {
+    #[br(count = length / 18)]
+    pub key_values: Vec<KeyValue>,
+}
+
+#[binread]
+#[derive(Debug)]
+pub struct KeyValue {
+    pub input: f32,
+    pub output: [f32; 4],
+}
+
+/// The start and end of the input range. These values only affect the display of the gradient
+/// in the user interface. They don't affect rendering.
+#[binread]
+#[br(import(_length: u32))]
+#[derive(Debug)]
+pub struct GradientRange {
+    pub name: f32,
+}
+
+/// The repeat mode. This is currently undefined.
+#[binread]
+#[br(import(_length: u32))]
+#[derive(Debug)]
+pub struct RepeatMode {
+    pub repeat_mode: u16,
+}

rust/lightwave/src/lwo2/sub_tags/blocks/mod.rs

@@ -1,11 +1,16 @@
 use crate::binrw_helpers::until_size_limit;
 use crate::iff::SubChunk;
+use crate::lwo2::sub_tags::blocks::gradient_texture::GradientTextureSubChunk;
 use crate::lwo2::sub_tags::blocks::image_texture::SurfaceBlockImageTextureSubChunk;
+use crate::lwo2::sub_tags::blocks::shaders::ShaderAlgorithm;
 use crate::lwo2::sub_tags::EnableState;
 use crate::lwo2::vx;
 use binrw::binread;
 
+pub mod gradient_texture;
 pub mod image_texture;
+pub mod procedural_texture;
+pub mod shaders;
 pub mod texture_mapping;
 
 #[binread]
@@ -21,9 +26,17 @@ pub enum SurfaceBlocks {
     #[br(magic(b"PROC"))]
     ProceduralTexture,
     #[br(magic(b"GRAD"))]
-    GradientTexture,
+    GradientTexture {
+        header: SubChunk<SurfaceBlockHeader>,
+        #[br(parse_with = until_size_limit(length as u64 - (header.length as u64 + 2 + 4)))]
+        attributes: Vec<GradientTextureSubChunk>,
+    },
     #[br(magic(b"SHDR"))]
-    ShaderPlugin,
+    ShaderPlugin {
+        header: SubChunk<SurfaceBlockHeader>,
+        #[br(magic(b"FUNC"))]
+        algorithm: SubChunk<ShaderAlgorithm>,
+    },
 }
 
 #[binread]

rust/lightwave/src/lwo2/sub_tags/blocks/shaders.rs

@@ -0,0 +1,11 @@
+use binrw::{binread, NullString};
+
+#[binread]
+#[br(import(length: u32))]
+#[derive(Debug)]
+pub struct ShaderAlgorithm {
+    #[br(align_after = 2)]
+    pub algorithm_name: NullString,
+    #[br(count = length - (algorithm_name.len() as u32 + 1))]
+    pub data: Vec<u8>,
+}

rust/lightwave/src/lwo2/sub_tags/mod.rs

@@ -1,9 +1,9 @@
 use crate::lwo2::vx;
-use binrw::binread;
+use binrw::{binread, NullString};
 
 pub mod blocks;
-pub mod surface_parameters;
 pub mod plugin;
+pub mod surface_parameters;
 
 #[binread]
 #[br(import(_length: u32))]
@@ -14,6 +14,14 @@ pub struct VectorEnvelope {
     pub envelope: u32,
 }
 
+#[binread]
+#[br(import(_length: u32))]
+#[derive(Debug)]
+pub struct Name {
+    #[br(align_after = 2)]
+    pub name: NullString,
+}
+
 #[binread]
 #[br(import(_length: u32))]
 #[derive(Debug)]