cli(render): allow specifying output dimensions

CLI.md

@@ -9,6 +9,7 @@ Commands:
   render      Render a shader preset against an image
   compare     Compare two runtimes and get a similarity score between the two runtimes rendering the same frame
   parse       Parse a preset and get a JSON representation of the data
+  pack        Create a serialized preset pack from a shader preset
   preprocess  Get the raw GLSL output of a preprocessed shader
   transpile   Transpile a shader in a given preset to the given format
   reflect     Reflect the shader relative to a preset, giving information about semantics used in a slang shader
@@ -53,6 +54,11 @@ Options:
 
           [default: 0]
           
+  -d, --dimensions <DIMENSIONS>
+          The dimensions of the image.
+
+          This is given in either explicit dimensions `WIDTHxHEIGHT`, or a percentage of the input image in `SCALE%`.
+
       --params <PARAMS>...
           Parameters to pass to the shader preset, comma separated with equals signs.
 
@@ -137,6 +143,11 @@ Options:
 
           [default: 0]
           
+  -d, --dimensions <DIMENSIONS>
+          The dimensions of the image.
+
+          This is given in either explicit dimensions `WIDTHxHEIGHT`, or a percentage of the input image in `SCALE%`.
+
       --params <PARAMS>...
           Parameters to pass to the shader preset, comma separated with equals signs.
 

README.md

@@ -111,6 +111,7 @@ Commands:
   render      Render a shader preset against an image
   compare     Compare two runtimes and get a similarity score between the two runtimes rendering the same frame
   parse       Parse a preset and get a JSON representation of the data
+  pack        Create a serialized preset pack from a shader preset
   preprocess  Get the raw GLSL output of a preprocessed shader
   transpile   Transpile a shader in a given preset to the given format
   reflect     Reflect the shader relative to a preset, giving information about semantics used in a slang shader

librashader-capi/src/ctypes.rs

@@ -49,7 +49,7 @@ pub enum LIBRA_PRESET_CTX_RUNTIME {
     /// Metal
     Metal,
     /// Direct3D 9
-    D3D9_HLSL
+    D3D9_HLSL,
 }
 
 impl From<LIBRA_PRESET_CTX_RUNTIME> for VideoDriver {
@@ -61,7 +61,7 @@ impl From<LIBRA_PRESET_CTX_RUNTIME> for VideoDriver {
             LIBRA_PRESET_CTX_RUNTIME::D3D11 => VideoDriver::Direct3D11,
             LIBRA_PRESET_CTX_RUNTIME::D3D12 => VideoDriver::Direct3D12,
             LIBRA_PRESET_CTX_RUNTIME::Metal => VideoDriver::Metal,
-            LIBRA_PRESET_CTX_RUNTIME::D3D9_HLSL => VideoDriver::Direct3D9Hlsl
+            LIBRA_PRESET_CTX_RUNTIME::D3D9_HLSL => VideoDriver::Direct3D9Hlsl,
         }
     }
 }

librashader-cli/src/cli/main.rs

@@ -7,6 +7,7 @@ use librashader::reflect::cross::{GlslVersion, HlslShaderModel, MslVersion, Spir
 use librashader::reflect::naga::{Naga, NagaLoweringOptions};
 use librashader::reflect::semantics::ShaderSemantics;
 use librashader::reflect::{CompileShader, FromCompilation, ReflectShader, SpirvCompilation};
+use librashader::runtime::Size;
 use librashader::{FastHashMap, ShortString};
 use librashader_runtime::parameters::RuntimeParameters;
 use librashader_test::render::{CommonFrameOptions, RenderTest};
@@ -43,6 +44,12 @@ struct RenderArgs {
     /// to ensure feedback and history.
     #[arg(short, long, default_value_t = 0)]
     frame: usize,
+    /// The dimensions of the image.
+    ///
+    /// This is given in either explicit dimensions `WIDTHxHEIGHT`, or a
+    /// percentage of the input image in `SCALE%`.
+    #[arg(short, long)]
+    dimensions: Option<String>,
     /// Parameters to pass to the shader preset, comma separated with equals signs.
     ///
     /// For example, crt_gamma=2.5,halation_weight=0.001
@@ -313,6 +320,7 @@ pub fn main() -> Result<(), anyhow::Error> {
             let PresetArgs { preset, wildcards } = preset;
             let RenderArgs {
                 frame,
+                dimensions,
                 params,
                 passes_enabled,
                 image,
@@ -320,13 +328,14 @@ pub fn main() -> Result<(), anyhow::Error> {
             } = render;
 
             let test: &mut dyn RenderTest = get_runtime!(runtime, image);
-
+            let dimensions = parse_dimension(dimensions, test.image_size())?;
             let preset = get_shader_preset(preset, wildcards)?;
             let params = parse_params(params)?;
 
             let image = test.render_with_preset_and_params(
                 preset,
                 frame,
+                Some(dimensions),
                 Some(&|rp| set_params(rp, &params, passes_enabled)),
                 options.map(CommonFrameOptions::from),
             )?;
@@ -348,6 +357,7 @@ pub fn main() -> Result<(), anyhow::Error> {
             let PresetArgs { preset, wildcards } = preset;
             let RenderArgs {
                 frame,
+                dimensions,
                 params,
                 passes_enabled,
                 image,
@@ -357,12 +367,14 @@ pub fn main() -> Result<(), anyhow::Error> {
             let left: &mut dyn RenderTest = get_runtime!(left, image);
             let right: &mut dyn RenderTest = get_runtime!(right, image);
 
+            let dimensions = parse_dimension(dimensions, left.image_size())?;
             let params = parse_params(params)?;
 
             let left_preset = get_shader_preset(preset.clone(), wildcards.clone())?;
             let left_image = left.render_with_preset_and_params(
                 left_preset,
                 frame,
+                Some(dimensions),
                 Some(&|rp| set_params(rp, &params, passes_enabled)),
                 None,
             )?;
@@ -371,6 +383,7 @@ pub fn main() -> Result<(), anyhow::Error> {
             let right_image = right.render_with_preset_and_params(
                 right_preset,
                 frame,
+                Some(dimensions),
                 Some(&|rp| set_params(rp, &params, passes_enabled)),
                 options.map(CommonFrameOptions::from),
             )?;
@@ -742,3 +755,47 @@ fn parse_msl_version(version_str: &str) -> anyhow::Result<MslVersion> {
         _ => return Err(anyhow!("Unknown MSL version")),
     })
 }
+
+fn parse_dimension(dimstr: Option<String>, image_dim: Size<u32>) -> anyhow::Result<Size<u32>> {
+    let Some(dimstr) = dimstr else {
+        return Ok(image_dim);
+    };
+
+    if dimstr.contains("x") {
+        if let Some((Ok(width), Ok(height))) = dimstr
+            .split_once("x")
+            .map(|(width, height)| (width.parse::<u32>(), height.parse::<u32>()))
+        {
+            if width < 1 || height < 1 {
+                return Err(anyhow!("Dimensions must be larger than 1x1"));
+            }
+
+            if width > 16384 || height > 16384 {
+                return Err(anyhow!("Dimensions must not be larger than 16384x16384"));
+            }
+            return Ok(Size::new(width, height));
+        }
+    }
+
+    if dimstr.ends_with("%") && dimstr.len() > 1 {
+        if let Ok(percent) = dimstr.trim_end_matches("%").parse::<u32>() {
+            let percent = percent as f32 / 100f32;
+            let width = (image_dim.width as f32 * percent) as u32;
+            let height = (image_dim.height as f32 * percent) as u32;
+
+            if width < 1 || height < 1 {
+                return Err(anyhow!("Dimensions must be larger than 1x1"));
+            }
+
+            if width > 16384 || height > 16384 {
+                return Err(anyhow!("Dimensions must not be larger than 16384x16384"));
+            }
+
+            return Ok(Size { width, height });
+        }
+    }
+
+    Err(anyhow!(
+        "Invalid dimension syntax, must either in form WIDTHxHEIGHT or SCALE%"
+    ))
+}

librashader-cli/src/render/d3d11.rs

@@ -4,6 +4,8 @@ use image::RgbaImage;
 use librashader::runtime::d3d11::*;
 use librashader::runtime::{FilterChainParameters, RuntimeParameters};
 use librashader::runtime::{Size, Viewport};
+use std::io::{Cursor, Write};
+use std::ops::DerefMut;
 use std::path::Path;
 
 impl RenderTest for Direct3D11 {
@@ -14,14 +16,20 @@ impl RenderTest for Direct3D11 {
         Direct3D11::new(path)
     }
 
+    fn image_size(&self) -> Size<u32> {
+        self.image_bytes.size
+    }
+
     fn render_with_preset_and_params(
         &mut self,
         preset: ShaderPreset,
         frame_count: usize,
+        output_size: Option<Size<u32>>,
         param_setter: Option<&dyn Fn(&RuntimeParameters)>,
         frame_options: Option<CommonFrameOptions>,
     ) -> anyhow::Result<image::RgbaImage> {
-        let (renderbuffer, rtv) = self.create_renderbuffer(self.image_bytes.size)?;
+        let output_size = output_size.unwrap_or(self.image_bytes.size);
+        let (renderbuffer, rtv) = self.create_renderbuffer(output_size)?;
 
         unsafe {
             let mut filter_chain = FilterChain::load_from_preset(
@@ -50,10 +58,10 @@ impl RenderTest for Direct3D11 {
             }
 
             let mut renderbuffer_desc = Default::default();
+            self.immediate_context.Flush();
             renderbuffer.GetDesc(&mut renderbuffer_desc);
 
-            self.immediate_context.Flush();
+            eprintln!("{:?}", renderbuffer_desc);
-
             let mut staging = None;
             self.device.CreateTexture2D(
                 &D3D11_TEXTURE2D_DESC {
@@ -72,6 +80,8 @@ impl RenderTest for Direct3D11 {
 
             self.immediate_context.CopyResource(&staging, &renderbuffer);
 
+            let mut pixels: Vec<u8> = Vec::new();
+
             let mut map_info = Default::default();
             self.immediate_context
                 .Map(&staging, 0, D3D11_MAP_READ, 0, Some(&mut map_info))?;
@@ -80,13 +90,18 @@ impl RenderTest for Direct3D11 {
                 map_info.pData as *const u8,
                 (renderbuffer_desc.Height * map_info.RowPitch) as usize,
             );
+            pixels.resize(
+                (renderbuffer_desc.Height * renderbuffer_desc.Width * 4) as usize,
+                0,
+            );
 
-            let image = RgbaImage::from_raw(
+            let mut cursor = Cursor::new(pixels.deref_mut());
-                renderbuffer_desc.Width,
+            for chunk in slice.chunks(map_info.RowPitch as usize) {
-                renderbuffer_desc.Height,
+                cursor.write_all(&chunk[..(renderbuffer_desc.Width * 4) as usize])?
-                Vec::from(slice),
+            }
-            )
+
-            .ok_or(anyhow!("Unable to create image from data"))?;
+            let image = RgbaImage::from_raw(output_size.width, output_size.height, pixels)
+                .ok_or(anyhow!("Unable to create image from data"))?;
             self.immediate_context.Unmap(&staging, 0);
 
             Ok(image)

librashader-cli/src/render/d3d12/mod.rs

@@ -8,8 +8,8 @@ use d3d12_descriptor_heap::{D3D12DescriptorHeap, D3D12DescriptorHeapSlot};
 use image::RgbaImage;
 use librashader::presets::ShaderPreset;
 use librashader::runtime::d3d12::{D3D12OutputView, FilterChain, FilterChainOptions, FrameOptions};
-use librashader::runtime::Viewport;
 use librashader::runtime::{FilterChainParameters, RuntimeParameters};
+use librashader::runtime::{Size, Viewport};
 use librashader_runtime::image::{Image, PixelFormat, UVDirection, BGRA8};
 use std::path::Path;
 use windows::core::Interface;
@@ -58,10 +58,14 @@ impl RenderTest for Direct3D12 {
         Direct3D12::new(path)
     }
 
+    fn image_size(&self) -> Size<u32> {
+        self.image.size
+    }
     fn render_with_preset_and_params(
         &mut self,
         preset: ShaderPreset,
         frame_count: usize,
+        output_size: Option<Size<u32>>,
         param_setter: Option<&dyn Fn(&RuntimeParameters)>,
         frame_options: Option<CommonFrameOptions>,
     ) -> anyhow::Result<image::RgbaImage> {
@@ -92,12 +96,13 @@ impl RenderTest for Direct3D12 {
                 setter(filter_chain.parameters());
             }
 
+            let output_size = output_size.unwrap_or(self.image.size);
             let mut output_texture = None;
             let desc = D3D12_RESOURCE_DESC {
                 Dimension: D3D12_RESOURCE_DIMENSION_TEXTURE2D,
                 Alignment: 0,
-                Width: self.image.size.width as u64,
+                Width: output_size.width as u64,
-                Height: self.image.size.height,
+                Height: output_size.height,
                 DepthOrArraySize: 1,
                 MipLevels: 1,
                 Format: DXGI_FORMAT_B8G8R8A8_UNORM,
@@ -135,7 +140,7 @@ impl RenderTest for Direct3D12 {
             let viewport = Viewport::new_render_target_sized_origin(
                 D3D12OutputView::new_from_raw(
                     *descriptor.as_ref(),
-                    self.image.size,
+                    output_size,
                     DXGI_FORMAT_B8G8R8A8_UNORM,
                 ),
                 None,
@@ -165,11 +170,11 @@ impl RenderTest for Direct3D12 {
                 CloseHandle(fence_event)?;
             };
 
-            let mut buffer = vec![0u8; self.image.bytes.len()];
+            let mut buffer = vec![0u8; (output_size.height * output_size.width) as usize * 4];
 
             output_texture.ReadFromSubresource(
                 buffer.as_mut_ptr().cast(),
-                4 * self.image.size.width,
+                4 * output_size.width,
                 0,
                 0,
                 None,
@@ -177,12 +182,9 @@ impl RenderTest for Direct3D12 {
 
             BGRA8::convert(&mut buffer);
 
-            let image = RgbaImage::from_raw(
+            let image =
-                self.image.size.width,
+                RgbaImage::from_raw(output_size.width, output_size.height, Vec::from(buffer))
-                self.image.size.height,
+                    .ok_or(anyhow!("Unable to create image from data"))?;
-                Vec::from(buffer),
-            )
-            .ok_or(anyhow!("Unable to create image from data"))?;
 
             Ok(image)
         }

librashader-cli/src/render/d3d9.rs

@@ -3,8 +3,8 @@ use anyhow::anyhow;
 use image::RgbaImage;
 use librashader::presets::ShaderPreset;
 use librashader::runtime::d3d9::{FilterChain, FilterChainOptions, FrameOptions};
-use librashader::runtime::Viewport;
 use librashader::runtime::{FilterChainParameters, RuntimeParameters};
+use librashader::runtime::{Size, Viewport};
 use librashader_runtime::image::{Image, PixelFormat, UVDirection, BGRA8};
 use std::path::Path;
 use windows::Win32::Foundation::{HWND, TRUE};
@@ -31,10 +31,15 @@ impl RenderTest for Direct3D9 {
         Direct3D9::new(path)
     }
 
+    fn image_size(&self) -> Size<u32> {
+        self.image.size
+    }
+
     fn render_with_preset_and_params(
         &mut self,
         preset: ShaderPreset,
         frame_count: usize,
+        output_size: Option<Size<u32>>,
         param_setter: Option<&dyn Fn(&RuntimeParameters)>,
         frame_options: Option<CommonFrameOptions>,
     ) -> anyhow::Result<image::RgbaImage> {
@@ -54,9 +59,10 @@ impl RenderTest for Direct3D9 {
 
             let mut render_texture = None;
 
+            let output_size = output_size.unwrap_or(self.image.size);
             self.device.CreateTexture(
-                self.image.size.width,
+                output_size.width,
-                self.image.size.height,
+                output_size.height,
                 1,
                 D3DUSAGE_RENDERTARGET as u32,
                 D3DFMT_A8R8G8B8,
@@ -71,8 +77,8 @@ impl RenderTest for Direct3D9 {
             let mut copy_texture = None;
 
             self.device.CreateOffscreenPlainSurface(
-                self.image.size.width,
+                output_size.width,
-                self.image.size.height,
+                output_size.height,
                 D3DFMT_A8R8G8B8,
                 D3DPOOL_SYSTEMMEM,
                 &mut copy_texture,
@@ -112,7 +118,7 @@ impl RenderTest for Direct3D9 {
 
             BGRA8::convert(&mut buffer);
 
-            let image = RgbaImage::from_raw(self.image.size.width, self.image.size.height, buffer)
+            let image = RgbaImage::from_raw(output_size.width, output_size.height, buffer)
                 .ok_or(anyhow!("Unable to create image from data"))?;
 
             Ok(image)

librashader-cli/src/render/gl/mod.rs

@@ -7,8 +7,8 @@ use glow::{HasContext, PixelPackData, PixelUnpackData};
 use image::RgbaImage;
 use librashader::presets::ShaderPreset;
 use librashader::runtime::gl::{FilterChain, FilterChainOptions, FrameOptions, GLImage};
-use librashader::runtime::Viewport;
 use librashader::runtime::{FilterChainParameters, RuntimeParameters};
+use librashader::runtime::{Size, Viewport};
 use librashader_runtime::image::{Image, UVDirection, RGBA8};
 use std::path::Path;
 use std::sync::Arc;
@@ -30,10 +30,15 @@ impl RenderTest for OpenGl3 {
         OpenGl3::new(path)
     }
 
+    fn image_size(&self) -> Size<u32> {
+        self.0.image_bytes.size
+    }
+
     fn render_with_preset_and_params(
         &mut self,
         preset: ShaderPreset,
         frame_count: usize,
+        output_size: Option<Size<u32>>,
         param_setter: Option<&dyn Fn(&RuntimeParameters)>,
         frame_options: Option<CommonFrameOptions>,
     ) -> anyhow::Result<image::RgbaImage> {
@@ -57,6 +62,7 @@ impl RenderTest for OpenGl3 {
         Ok(self.0.render(
             &mut filter_chain,
             frame_count,
+            output_size,
             frame_options
                 .map(|options| FrameOptions {
                     clear_history: options.clear_history,
@@ -78,10 +84,15 @@ impl RenderTest for OpenGl4 {
         OpenGl4::new(path)
     }
 
+    fn image_size(&self) -> Size<u32> {
+        self.0.image_bytes.size
+    }
+
     fn render_with_preset_and_params(
         &mut self,
         preset: ShaderPreset,
         frame_count: usize,
+        output_size: Option<Size<u32>>,
         param_setter: Option<&dyn Fn(&RuntimeParameters)>,
         frame_options: Option<CommonFrameOptions>,
     ) -> anyhow::Result<image::RgbaImage> {
@@ -105,6 +116,7 @@ impl RenderTest for OpenGl4 {
         Ok(self.0.render(
             &mut filter_chain,
             frame_count,
+            output_size,
             frame_options
                 .map(|options| FrameOptions {
                     clear_history: options.clear_history,
@@ -189,8 +201,11 @@ impl OpenGl {
         &self,
         chain: &mut FilterChain,
         frame_count: usize,
+        output_size: Option<Size<u32>>,
         options: Option<&FrameOptions>,
     ) -> Result<RgbaImage, anyhow::Error> {
+        let output_size = output_size.unwrap_or(self.image_bytes.size);
+
         let render_texture = unsafe {
             let tex = self
                 .context
@@ -202,8 +217,8 @@ impl OpenGl {
                 glow::TEXTURE_2D,
                 1,
                 glow::RGBA8,
-                self.image_bytes.size.width as i32,
+                output_size.width as i32,
-                self.image_bytes.size.height as i32,
+                output_size.height as i32,
             );
             self.context.gl.bind_texture(glow::TEXTURE_2D, None);
             tex
@@ -212,7 +227,7 @@ impl OpenGl {
         let output = GLImage {
             handle: Some(render_texture),
             format: glow::RGBA8,
-            size: self.image_bytes.size,
+            size: output_size,
         };
 
         let viewport = Viewport::new_render_target_sized_origin(&output, None)?;
@@ -222,8 +237,7 @@ impl OpenGl {
             }
         }
 
-        // should be the same size as the input image
+        let mut data = vec![0u8; output_size.width as usize * output_size.height as usize * 4];
-        let mut data = vec![0u8; self.image_bytes.bytes.len()];
 
         unsafe {
             self.context
@@ -237,11 +251,9 @@ impl OpenGl {
                 PixelPackData::Slice(&mut data),
             )
         }
-        Ok(RgbaImage::from_raw(
+        Ok(
-            self.image_bytes.size.width,
+            RgbaImage::from_raw(output_size.width, output_size.height, data)
-            self.image_bytes.size.height,
+                .ok_or(anyhow!("failed to create image from slice"))?,
-            data,
         )
-        .ok_or(anyhow!("failed to create image from slice"))?)
     }
 }

librashader-cli/src/render/mod.rs

@@ -20,6 +20,7 @@ pub mod wgpu;
 pub mod mtl;
 
 use librashader::presets::ShaderPreset;
+use librashader::runtime::Size;
 use librashader_runtime::impl_default_frame_options;
 use librashader_runtime::parameters::RuntimeParameters;
 use std::path::Path;
@@ -31,6 +32,9 @@ pub trait RenderTest {
     where
         Self: Sized;
 
+    /// Get the size of the image loaded.
+    fn image_size(&self) -> Size<u32>;
+
     /// Render a shader onto an image buffer, applying the provided shader.
     ///
     /// The test should render in linear colour space for proper comparison against
@@ -39,9 +43,14 @@ pub trait RenderTest {
     /// For testing purposes, it is often that a single image will be reused with multiple
     /// shader presets, so the actual image that a shader will be applied to
     /// will often be part of the test harness object.
-    fn render(&mut self, path: &Path, frame_count: usize) -> anyhow::Result<image::RgbaImage> {
+    fn render(
+        &mut self,
+        path: &Path,
+        frame_count: usize,
+        output_size: Option<Size<u32>>,
+    ) -> anyhow::Result<image::RgbaImage> {
         let preset = ShaderPreset::try_parse(path)?;
-        self.render_with_preset(preset, frame_count)
+        self.render_with_preset(preset, frame_count, output_size)
     }
 
     /// Render a shader onto an image buffer, applying the provided shader.
@@ -56,8 +65,9 @@ pub trait RenderTest {
         &mut self,
         preset: ShaderPreset,
         frame_count: usize,
+        output_size: Option<Size<u32>>,
     ) -> anyhow::Result<image::RgbaImage> {
-        self.render_with_preset_and_params(preset, frame_count, None, None)
+        self.render_with_preset_and_params(preset, frame_count, output_size, None, None)
     }
 
     /// Render a shader onto an image buffer, applying the provided shader.
@@ -72,6 +82,7 @@ pub trait RenderTest {
         &mut self,
         preset: ShaderPreset,
         frame_count: usize,
+        output_size: Option<Size<u32>>,
         param_setter: Option<&dyn Fn(&RuntimeParameters)>,
         frame_options: Option<CommonFrameOptions>,
     ) -> anyhow::Result<image::RgbaImage>;

librashader-cli/src/render/mtl.rs

@@ -3,8 +3,8 @@ use anyhow::anyhow;
 use image::RgbaImage;
 use librashader::presets::ShaderPreset;
 use librashader::runtime::mtl::{FilterChain, FilterChainOptions, FrameOptions};
-use librashader::runtime::Viewport;
 use librashader::runtime::{FilterChainParameters, RuntimeParameters};
+use librashader::runtime::{Size, Viewport};
 use librashader_runtime::image::{Image, PixelFormat, UVDirection, BGRA8};
 use objc2::ffi::NSUInteger;
 use objc2::rc::Retained;
@@ -31,10 +31,15 @@ impl RenderTest for Metal {
         Metal::new(path)
     }
 
+    fn image_size(&self) -> Size<u32> {
+        self.image_bytes.size
+    }
+
     fn render_with_preset_and_params(
         &mut self,
         preset: ShaderPreset,
         frame_count: usize,
+        output_size: Option<Size<u32>>,
         param_setter: Option<&dyn Fn(&RuntimeParameters)>,
         frame_options: Option<CommonFrameOptions>,
     ) -> anyhow::Result<image::RgbaImage> {
@@ -59,12 +64,14 @@ impl RenderTest for Metal {
             setter(filter_chain.parameters());
         }
 
+        let output_size = output_size.unwrap_or(self.image_bytes.size);
+
         let render_texture = unsafe {
             let texture_descriptor =
                 MTLTextureDescriptor::texture2DDescriptorWithPixelFormat_width_height_mipmapped(
                     MTLPixelFormat::BGRA8Unorm,
-                    self.image_bytes.size.width as NSUInteger,
+                    output_size.width as NSUInteger,
-                    self.image_bytes.size.height as NSUInteger,
+                    output_size.height as NSUInteger,
                     false,
                 );
 
@@ -113,18 +120,19 @@ impl RenderTest for Metal {
         let region = MTLRegion {
             origin: MTLOrigin { x: 0, y: 0, z: 0 },
             size: MTLSize {
-                width: self.image_bytes.size.width as usize,
+                width: output_size.width as usize,
-                height: self.image_bytes.size.height as usize,
+                height: output_size.height as usize,
                 depth: 1,
             },
         };
 
         unsafe {
             // should be the same size
-            let mut buffer = vec![0u8; self.image_bytes.bytes.len()];
+            let mut buffer =
+                vec![0u8; output_size.width as usize * output_size.height as usize * 4];
             render_texture.getBytes_bytesPerRow_fromRegion_mipmapLevel(
                 NonNull::new(buffer.as_mut_ptr().cast()).unwrap(),
-                4 * self.image_bytes.size.width as usize,
+                4 * output_size.width as usize,
                 region,
                 0,
             );

librashader-cli/src/render/vk/mod.rs

@@ -7,8 +7,8 @@ use gpu_allocator::MemoryLocation;
 use image::RgbaImage;
 use librashader::presets::ShaderPreset;
 use librashader::runtime::vk::{FilterChain, FilterChainOptions, FrameOptions, VulkanImage};
-use librashader::runtime::Viewport;
 use librashader::runtime::{FilterChainParameters, RuntimeParameters};
+use librashader::runtime::{Size, Viewport};
 use librashader_runtime::image::{Image, UVDirection, BGRA8};
 use std::path::Path;
 
@@ -32,10 +32,15 @@ impl RenderTest for Vulkan {
         Vulkan::new(path)
     }
 
+    fn image_size(&self) -> Size<u32> {
+        self.image_bytes.size
+    }
+
     fn render_with_preset_and_params(
         &mut self,
         preset: ShaderPreset,
         frame_count: usize,
+        output_size: Option<Size<u32>>,
         param_setter: Option<&dyn Fn(&RuntimeParameters)>,
         frame_options: Option<CommonFrameOptions>,
     ) -> anyhow::Result<image::RgbaImage> {
@@ -58,7 +63,7 @@ impl RenderTest for Vulkan {
             let image_info = vk::ImageCreateInfo::default()
                 .image_type(vk::ImageType::TYPE_2D)
                 .format(vk::Format::B8G8R8A8_UNORM)
-                .extent(self.image_bytes.size.into())
+                .extent(output_size.map_or(self.image_bytes.size.into(), |size| size.into()))
                 .mip_levels(1)
                 .array_layers(1)
                 .samples(vk::SampleCountFlags::TYPE_1)

librashader-cli/src/render/wgpu.rs

@@ -2,7 +2,7 @@ use crate::render::{CommonFrameOptions, RenderTest};
 use anyhow::anyhow;
 use image::RgbaImage;
 use librashader::runtime::wgpu::*;
-use librashader::runtime::Viewport;
+use librashader::runtime::{Size, Viewport};
 use librashader_runtime::image::{Image, UVDirection};
 use std::io::{Cursor, Write};
 use std::ops::DerefMut;
@@ -23,7 +23,7 @@ pub struct Wgpu {
     _adapter: Adapter,
     device: Arc<Device>,
     queue: Arc<Queue>,
-    _image: Image,
+    image: Image,
     texture: Arc<Texture>,
 }
 
@@ -56,10 +56,15 @@ impl RenderTest for Wgpu {
         Wgpu::new(path)
     }
 
+    fn image_size(&self) -> Size<u32> {
+        self.image.size
+    }
+
     fn render_with_preset_and_params(
         &mut self,
         preset: ShaderPreset,
         frame_count: usize,
+        output_size: Option<Size<u32>>,
         param_setter: Option<&dyn Fn(&RuntimeParameters)>,
         frame_options: Option<CommonFrameOptions>,
     ) -> anyhow::Result<image::RgbaImage> {
@@ -82,7 +87,7 @@ impl RenderTest for Wgpu {
 
         let output_tex = self.device.create_texture(&TextureDescriptor {
             label: None,
-            size: self.texture.size(),
+            size: output_size.map_or(self.texture.size(), |size| size.into()),
             mip_level_count: 1,
             sample_count: 1,
             dimension: TextureDimension::D2,
@@ -219,7 +224,7 @@ impl Wgpu {
                 _adapter: adapter,
                 device: Arc::new(device),
                 queue: Arc::new(queue),
-                _image: image,
+                image: image,
                 texture: Arc::new(texture),
             })
         })