bc5 normal maps

src/vulkan/dds.rs

@@ -0,0 +1,40 @@
+use std::{convert::TryInto, io::Read};
+
+use vulkano::format::Format;
+
+use super::VulkanRenderer;
+
+pub fn upload_texture_from_file(path: &str, renderer: &mut VulkanRenderer) -> Result<(), Box<dyn std::error::Error>> {
+    // Load file
+    let mut tex_file = std::fs::File::open(path)?;
+    let mut tex_bytes: Vec<u8> = vec![];
+    tex_file.read_to_end(&mut tex_bytes)?;
+
+    // Parse DDS
+    let tex_height = u32::from_ne_bytes(tex_bytes[12..16].try_into()?);
+    let tex_width = u32::from_ne_bytes(tex_bytes[16..20].try_into()?);
+    let tex_byte_count = u32::from_ne_bytes(tex_bytes[20..24].try_into()?);
+    let pixel_format_flags = u32::from_ne_bytes(tex_bytes[80..84].try_into()?);
+    let pixel_format_name: [u8; 4] = tex_bytes[84..88].try_into()?;
+    let is_dxt1 = pixel_format_name == [0x44, 0x58, 0x54, 0x31]; // [D,X,T,1]
+    let is_dx10 = pixel_format_name == [0x44, 0x58, 0x31, 0x30]; // [D,X,1,0]
+
+    assert!(pixel_format_flags == 0x00000004);
+    assert!(is_dxt1 || is_dx10);
+
+    println!("Texture width: {}, height: {}, bytes: {}", tex_width, tex_height, tex_byte_count);
+
+    if is_dxt1
+    {
+        renderer.upload_texture(&tex_bytes[128..], tex_width, tex_height, Format::BC1_RGBUnormBlock, renderer.device.clone());
+    }
+    if is_dx10
+    {
+        let dxgi_type = u32::from_ne_bytes(tex_bytes[128..132].try_into()?);
+        assert!(dxgi_type == 83);
+        
+        renderer.upload_texture(&tex_bytes[128+20..], tex_width, tex_height, Format::BC5UnormBlock, renderer.device.clone());
+    }
+
+    Ok(())
+}