gl: implement passfeedback and original history

librashader-preprocess/src/pragma.rs

@@ -6,6 +6,7 @@ use nom::number::complete::float;
 use nom::sequence::delimited;
 use nom::IResult;
 use std::str::FromStr;
+use nom::character::complete::multispace1;
 
 #[derive(Debug)]
 pub(crate) struct ShaderMeta {
@@ -15,18 +16,25 @@ pub(crate) struct ShaderMeta {
 }
 
 fn parse_parameter_string(input: &str) -> Result<ShaderParameter, PreprocessError> {
-    fn parse_parameter_string_inner(input: &str) -> IResult<&str, ShaderParameter> {
+    fn parse_parameter_string_name(input: &str) -> IResult<&str, (&str, &str)> {
         let (input, _) = tag("#pragma parameter ")(input)?;
-        let (input, name) = take_while(|c| c != ' ')(input)?;
+        let (input, name) = take_while(|c| c != ' ' && c != '\t')(input)?;
-        let (input, _) = tag(" ")(input)?;
+        let (input, _) = multispace1(input)?;
         let (input, description) = delimited(tag("\""), is_not("\""), tag("\""))(input)?;
-        let (input, _) = tag(" ")(input)?;
+        let (input, _) = multispace1(input)?;
+        Ok((
+            input,
+            (name, description)
+        ))
+    }
+
+    fn parse_parameter_string_inner<'a, 'b>(name: &'a str, description: &'a str, input: &'b str) -> IResult<&'b str, ShaderParameter> {
         let (input, initial) = float(input)?;
-        let (input, _) = tag(" ")(input)?;
+        let (input, _) = multispace1(input)?;
         let (input, minimum) = float(input)?;
-        let (input, _) = tag(" ")(input)?;
+        let (input, _) = multispace1(input)?;
         let (input, maximum) = float(input)?;
-        let (input, _) = tag(" ")(input)?;
+        let (input, _) = multispace1(input)?;
         let (input, step) = float(input)?;
         Ok((
             input,
@@ -41,11 +49,26 @@ fn parse_parameter_string(input: &str) -> Result<ShaderParameter, PreprocessErro
         ))
     }
 
-    if let Ok((_, parameter)) = parse_parameter_string_inner(input) {
+
-        Ok(parameter)
+    let Ok((params, (name, description))) = parse_parameter_string_name(input) else {
+        return Err(PreprocessError::PragmaParseError(input.to_string()));
+    };
+
+    // some shaders do some really funky things with their pragmas so we need to be lenient and ignore
+    // that it can be set at all.
+    if let Ok((_, param)) = parse_parameter_string_inner(name, description, params) {
+        Ok(param)
     } else {
-        Err(PreprocessError::PragmaParseError(input.to_string()))
+        Ok(ShaderParameter {
+            id: name.to_string(),
+            description: description.to_string(),
+            initial: 0f32,
+            minimum: 0f32,
+            maximum: 0f32,
+            step: 0f32,
+        })
     }
+
 }
 
 pub(crate) fn parse_pragma_meta(source: impl AsRef<str>) -> Result<ShaderMeta, PreprocessError> {

librashader-presets/Cargo.toml

@@ -10,3 +10,4 @@ thiserror = "1.0.37"
 nom = "7.1.1"
 nom_locate = "4.0.0"
 librashader = { path = "../librashader" }
+num-traits = "0.2"

librashader-presets/src/parse/preset.rs

@@ -139,7 +139,7 @@ pub fn resolve_values(mut values: Vec<Value>) -> ShaderPreset {
                         Value::FrameCountMod(_, value) => Some(*value),
                         _ => None,
                     })
-                    .unwrap_or(1),
+                    .unwrap_or(0),
                 srgb_framebuffer: shader_values
                     .iter()
                     .find_map(|f| match f {

librashader-presets/src/parse/value.rs

@@ -6,6 +6,8 @@ use nom::character::complete::digit1;
 use nom::combinator::{eof, map_res};
 
 use nom::IResult;
+use num_traits::cast::ToPrimitive;
+
 
 use crate::parse::token::do_lex;
 use std::fs::File;
@@ -66,14 +68,28 @@ impl Value {
 
 fn from_int(input: Span) -> Result<i32, ParsePresetError> {
     i32::from_str(input.trim()).map_err(|_| {
-        eprintln!("{input}");
         ParsePresetError::ParserError {
             offset: input.location_offset(),
             row: input.location_line(),
             col: input.get_column(),
             kind: ParseErrorKind::Int,
         }
+    }).or_else(|e| {
+        let result = f32::from_str(input.trim())
+            .map_err(|_| e)?;
+        let result = result.trunc().to_i32()
+            .ok_or(ParsePresetError::ParserError {
+                offset: input.location_offset(),
+                row: input.location_line(),
+                col: input.get_column(),
+                kind: ParseErrorKind::Int,
+            })?;
+
+        eprintln!("falling back to float trunc {result}");
+        Ok(result)
     })
+
+
 }
 
 fn from_ul(input: Span) -> Result<u32, ParsePresetError> {

librashader-reflect/src/reflect/cross.rs

@@ -260,6 +260,7 @@ where
         if descriptor_set != 0 {
             return Err(blame.error(SemanticsErrorKind::InvalidDescriptorSet(descriptor_set)));
         }
+
         let size = ast.get_declared_struct_size(ubo.base_type_id)?;
         Ok(UboData {
             descriptor_set,

librashader-reflect/src/reflect/mod.rs

@@ -1,3 +1,4 @@
+use std::ops::Index;
 use crate::error::ShaderReflectError;
 use crate::reflect::semantics::{
     SemanticMap, TextureImage, TextureSemantics, TextureSizeMeta, VariableMeta, VariableSemantics,
@@ -97,7 +98,9 @@ impl TextureSemanticMap<UniformSemantic> for FxHashMap<String, SemanticMap<Textu
             None => {
                 if let Some(semantics) = TextureSemantics::TEXTURE_SEMANTICS
                     .iter()
-                    .find(|f| name.starts_with(f.texture_name()))
+                    .find(|f| {
+                        name.starts_with(f.texture_name())
+                    })
                 {
                     if semantics.is_array() {
                         let index = &name[semantics.texture_name().len()..];

librashader-reflect/src/reflect/semantics.rs

@@ -63,10 +63,13 @@ pub enum TextureSemantics {
 }
 
 impl TextureSemantics {
-    pub const TEXTURE_SEMANTICS: [TextureSemantics; 6] = [
+    pub(crate) const TEXTURE_SEMANTICS: [TextureSemantics; 6] = [
-        TextureSemantics::Original,
         TextureSemantics::Source,
+        // originalhistory needs to come first, otherwise
+        // the name lookup implementation will prioritize Original
+        // when reflecting semantics.
         TextureSemantics::OriginalHistory,
+        TextureSemantics::Original,
         TextureSemantics::PassOutput,
         TextureSemantics::PassFeedback,
         TextureSemantics::User,

librashader-runtime-gl/src/filter_chain.rs

@@ -1,3 +1,4 @@
+use std::collections::VecDeque;
 use crate::binding::{UniformBinding, UniformLocation, VariableLocation};
 use crate::filter_pass::FilterPass;
 use crate::framebuffer::Framebuffer;
@@ -6,8 +7,8 @@ use crate::util;
 use crate::util::{GlImage, InlineRingBuffer, Size, Texture, Viewport};
 use gl::types::{GLenum, GLint, GLsizei, GLsizeiptr, GLuint};
 use librashader::image::Image;
-use librashader::{FilterMode, ShaderSource};
+use librashader::{FilterMode, ShaderSource, WrapMode};
-use librashader_presets::{ShaderPassConfig, ShaderPreset, TextureConfig};
+use librashader_presets::{ScaleType, ShaderPassConfig, ShaderPreset, TextureConfig};
 use librashader_reflect::back::cross::{GlVersion, GlslangGlslContext};
 use librashader_reflect::back::targets::{CompilerBackend, FromCompilation, GLSL};
 use librashader_reflect::back::CompileShader;
@@ -19,11 +20,27 @@ use rustc_hash::FxHashMap;
 use spirv_cross::spirv::Decoration;
 use std::error::Error;
 use std::path::Path;
+use crate::quad_render::DrawQuad;
+
+pub struct FilterChain {
+    passes: Box<[FilterPass]>,
+    common: FilterCommon,
+    filter_vao: GLuint,
+    output_framebuffers: Box<[Framebuffer]>,
+    feedback_framebuffers: Box<[Framebuffer]>,
+    history_framebuffers: VecDeque<Framebuffer>,
+}
+
+pub struct FilterCommon {
+    semantics: ReflectSemantics,
+    pub(crate) preset: ShaderPreset,
+    pub(crate) luts: FxHashMap<usize, Texture>,
+    pub output_textures: Box<[Texture]>,
+    pub feedback_textures: Box<[Texture]>,
+    pub history_textures: Box<[Texture]>,
+    pub(crate) draw_quad: DrawQuad,
+}
 
-static QUAD_VBO_DATA: &[f32; 16] = &[
-    0.0f32, 0.0f32, 0.0f32, 0.0f32, 1.0f32, 0.0f32, 1.0f32, 0.0f32, 0.0f32, 1.0f32, 0.0f32, 1.0f32,
-    1.0f32, 1.0f32, 1.0f32, 1.0f32,
-];
 
 impl FilterChain {
     fn load_pass_semantics(
@@ -103,24 +120,6 @@ impl FilterChain {
     }
 }
 
-pub struct FilterChain {
-    passes: Box<[FilterPass]>,
-    common: FilterCommon,
-    quad_vao: GLuint,
-    output_framebuffers: Box<[Framebuffer]>,
-}
-
-pub struct FilterCommon {
-    semantics: ReflectSemantics,
-    pub(crate) preset: ShaderPreset,
-    pub original_history: Box<[Framebuffer]>,
-    pub history: Vec<Texture>,
-    pub feedback: Vec<Texture>,
-    pub(crate) luts: FxHashMap<usize, Texture>,
-    pub output_textures: Box<[Texture]>,
-    pub(crate) quad_vbo: GLuint,
-}
-
 type ShaderPassMeta<'a> = (
     &'a ShaderPassConfig,
     ShaderSource,
@@ -330,7 +329,6 @@ impl FilterChain {
                         .vertex
                         .get_decoration(res.id, Decoration::Location)?;
                     let loc_name = format!("LIBRA_ATTRIBUTE_{loc}\0");
-                    eprintln!("{loc_name}");
                     gl::BindAttribLocation(program, loc, loc_name.as_str().as_ptr().cast())
                 }
                 gl::LinkProgram(program);
@@ -443,7 +441,7 @@ impl FilterChain {
                 );
             }
 
-            // eprintln!("{:#?}", semantics);
+            // eprintln!("{:#?}", reflection.meta.texture_meta);
             // eprintln!("{:#?}", reflection.meta);
             // eprintln!("{:#?}", locations);
             // eprintln!("{:#?}", reflection.push_constant);
@@ -469,7 +467,7 @@ impl FilterChain {
         Ok(filters.into_boxed_slice())
     }
 
-    pub fn init_history(filters: &[FilterPass]) -> Box<[Framebuffer]> {
+    pub fn init_history(filters: &[FilterPass], filter: FilterMode, wrap_mode: WrapMode) -> (VecDeque<Framebuffer>, Box<[Texture]>) {
         let mut required_images = 0;
 
         for pass in filters {
@@ -493,56 +491,27 @@ impl FilterChain {
             required_images = std::cmp::max(required_images, texture_size_count);
         }
 
-        // not ussing frame history;
+        // not using frame history;
-        if required_images < 2 {
+        if required_images <= 1 {
-            eprintln!("not using frame history");
+            println!("[history] not using frame history");
-            return Vec::new().into_boxed_slice();
+            return (VecDeque::new(), Box::new([]))
         }
 
         // history0 is aliased with the original
-        required_images -= 1;
 
-        let mut framebuffers = Vec::new();
+        eprintln!("[history] using frame history with {required_images} images");
+        let mut framebuffers = VecDeque::with_capacity(required_images);
         framebuffers.resize_with(required_images, || Framebuffer::new(1));
-        framebuffers.into_boxed_slice()
-    }
 
-    pub fn init_feedback(filters: &[FilterPass]) -> Box<[Framebuffer]> {
+        let mut history_textures = Vec::new();
-        let mut required_images = 0;
+        history_textures.resize_with(required_images, || Texture {
+            image: Default::default(),
+            filter,
+            mip_filter: filter,
+            wrap_mode
+        });
 
-        for pass in filters {
+        (framebuffers, history_textures.into_boxed_slice())
-            // If a shader uses history size, but not history, we still need to keep the texture.
-            let texture_count = pass
-                .reflection
-                .meta
-                .texture_meta
-                .iter()
-                .filter(|(semantics, _)| semantics.semantics == TextureSemantics::OriginalHistory)
-                .count();
-            let texture_size_count = pass
-                .reflection
-                .meta
-                .texture_size_meta
-                .iter()
-                .filter(|(semantics, _)| semantics.semantics == TextureSemantics::OriginalHistory)
-                .count();
-
-            required_images = std::cmp::max(required_images, texture_count);
-            required_images = std::cmp::max(required_images, texture_size_count);
-        }
-
-        // not ussing frame history;
-        if required_images < 2 {
-            eprintln!("not using frame history");
-            return Vec::new().into_boxed_slice();
-        }
-
-        // history0 is aliased with the original
-        required_images -= 1;
-
-        let mut framebuffers = Vec::new();
-        framebuffers.resize_with(required_images, || Framebuffer::new(1));
-        framebuffers.into_boxed_slice()
     }
 
     pub fn load(path: impl AsRef<Path>) -> Result<FilterChain, Box<dyn Error>> {
@@ -553,49 +522,50 @@ impl FilterChain {
         // initialize passes
         let filters = FilterChain::init_passes(passes, &semantics)?;
 
+        let default_filter = filters.first().map(|f| f.config.filter).unwrap_or_default();
+        let default_wrap = filters.first().map(|f| f.config.wrap_mode).unwrap_or_default();
+
         // initialize output framebuffers
         let mut output_framebuffers = Vec::new();
         output_framebuffers.resize_with(filters.len(), || Framebuffer::new(1));
         let mut output_textures = Vec::new();
         output_textures.resize_with(filters.len(), Texture::default);
 
+
+        // initialize feedback framebuffers
+        let mut feedback_framebuffers = Vec::new();
+        feedback_framebuffers.resize_with(filters.len(), || Framebuffer::new(1));
+        let mut feedback_textures = Vec::new();
+        feedback_textures.resize_with(filters.len(), Texture::default);
+
         // load luts
         let luts = FilterChain::load_luts(&preset.textures)?;
 
-        let original_history = FilterChain::init_history(&filters);
+        let (history_framebuffers, history_textures) =
+            FilterChain::init_history(&filters, default_filter, default_wrap);
 
         // create VBO objects
-        let mut quad_vbo = 0;
+        let draw_quad = DrawQuad::new();
-        unsafe {
-            gl::GenBuffers(1, &mut quad_vbo);
-            gl::BindBuffer(gl::ARRAY_BUFFER, quad_vbo);
-            gl::BufferData(
-                gl::ARRAY_BUFFER,
-                std::mem::size_of_val(QUAD_VBO_DATA) as GLsizeiptr,
-                QUAD_VBO_DATA.as_ptr().cast(),
-                gl::STATIC_DRAW,
-            );
-            gl::BindBuffer(gl::ARRAY_BUFFER, 0);
-        }
 
-        let mut quad_vao = 0;
+        let mut filter_vao = 0;
         unsafe {
-            gl::GenVertexArrays(1, &mut quad_vao);
+            gl::GenVertexArrays(1, &mut filter_vao);
         }
 
         Ok(FilterChain {
             passes: filters,
             output_framebuffers: output_framebuffers.into_boxed_slice(),
-            quad_vao,
+            feedback_framebuffers: feedback_framebuffers.into_boxed_slice(),
+            history_framebuffers,
+            filter_vao,
             common: FilterCommon {
                 semantics,
                 preset,
-                original_history,
-                history: vec![],
-                feedback: vec![],
                 luts,
                 output_textures: output_textures.into_boxed_slice(),
-                quad_vbo,
+                feedback_textures: feedback_textures.into_boxed_slice(),
+                history_textures,
+                draw_quad,
             },
         })
     }
@@ -605,35 +575,58 @@ impl FilterChain {
         self.output_framebuffers[index].as_texture(config.filter, config.wrap_mode)
     }
 
-    pub fn frame(&mut self, count: usize, vp: &Viewport, input: GlImage, _clear: bool) {
+    pub fn push_history(&mut self, input: &GlImage) {
+        if let Some(mut back) = self.history_framebuffers.pop_back() {
+
+            if back.size != input.size
+                || (input.format != 0 && input.format != back.format) {
+                eprintln!("[history] resizing");
+                back.init(input.size, input.format);
+            }
+
+            if back.is_initialized() {
+                back.copy_from(&input);
+            }
+
+            self.history_framebuffers.push_front(back)
+        }
+    }
+
+    pub fn frame(&mut self, count: usize, viewport: &Viewport, input: &GlImage, clear: bool) {
+        if clear {
+            for framebuffer in &self.history_framebuffers {
+                framebuffer.clear()
+            }
+        }
+
+
         if self.passes.is_empty() {
             return;
         }
 
         unsafe {
             gl::BindFramebuffer(gl::FRAMEBUFFER, 0);
-            gl::BindVertexArray(self.quad_vao);
+            gl::BindVertexArray(self.filter_vao);
         }
 
-        // todo: copy framebuffer
+        let filter = self.passes[0].config.filter;
-        // shader_gl3: 2067
+        let wrap_mode = self.passes[0].config.wrap_mode;
-        let filter = self
-            .common
-            .preset
-            .shaders
-            .first()
-            .map(|f| f.filter)
-            .unwrap_or_default();
-        let wrap_mode = self
-            .common
-            .preset
-            .shaders
-            .first()
-            .map(|f| f.wrap_mode)
-            .unwrap_or_default();
 
+        // update history
+        for (texture, fbo) in self.common.history_textures.iter_mut().zip(self.history_framebuffers.iter()) {
+            texture.image = fbo.as_texture(filter, wrap_mode).image;
+        }
+
+        for ((texture, fbo), pass) in self.common.feedback_textures.iter_mut()
+            .zip(self.feedback_framebuffers.iter())
+            .zip(self.passes.iter())
+        {
+            texture.image = fbo.as_texture(pass.config.filter, pass.config.wrap_mode).image;
+        }
+
+        // shader_gl3: 2067
         let original = Texture {
-            image: input,
+            image: *input,
             filter,
             mip_filter: filter,
             wrap_mode,
@@ -650,7 +643,7 @@ impl FilterChain {
                 let _framebuffer_size = target.scale(
                     pass.config.scaling.clone(),
                     pass.get_format(),
-                    vp,
+                    viewport,
                     &original,
                     &source,
                 );
@@ -660,9 +653,13 @@ impl FilterChain {
             pass.draw(
                 index,
                 &self.common,
-                (count % pass.config.frame_count_mod as usize) as u32,
+                if pass.config.frame_count_mod > 0 {
+                    count % pass.config.frame_count_mod as usize
+                } else {
+                    count
+                } as u32,
                 1,
-                vp,
+                viewport,
                 &original,
                 &source,
                 RenderTarget::new(target, None),
@@ -681,19 +678,29 @@ impl FilterChain {
             pass.draw(
                 passes_len - 1,
                 &self.common,
-                (count % pass.config.frame_count_mod as usize) as u32,
+                if pass.config.frame_count_mod > 0 {
+                    count % pass.config.frame_count_mod as usize
+                } else {
+                    count
+                } as u32,
                 1,
-                vp,
+                viewport,
                 &original,
                 &source,
-                RenderTarget::new(vp.output, vp.mvp),
+                RenderTarget::new(viewport.output, viewport.mvp),
             );
         }
 
+        // swap feedback framebuffers with output
+        for (output, feedback) in self.output_framebuffers.iter_mut().zip(self.feedback_framebuffers.iter_mut()) {
+            std::mem::swap(output, feedback);
+        }
+
+        self.push_history(&input);
         unsafe {
             gl::BindFramebuffer(gl::FRAMEBUFFER, 0);
             gl::BindVertexArray(0);
         }
-        // todo: deal with the mess that is frame history
     }
+
 }

librashader-runtime-gl/src/filter_pass.rs

@@ -93,8 +93,11 @@ impl FilterPass {
         Self::build_uniform(location, buffer, value, gl::Uniform1f)
     }
 
-    fn bind_texture(binding: &TextureImage, texture: &Texture) {
+    fn bind_texture(binding: &TextureImage, texture: &Texture, semantic: TextureSemantics) {
         unsafe {
+            if texture.image.handle == 0 {
+                eprintln!("[WARNING] trying to bind {semantic:?} texture 0 to slot {} ", binding.binding)
+            }
             // eprintln!("setting {} to texunit {}", texture.image.handle, binding.binding);
             gl::ActiveTexture(gl::TEXTURE0 + binding.binding);
             gl::BindTexture(gl::TEXTURE_2D, texture.image.handle);
@@ -220,7 +223,7 @@ impl FilterPass {
             gl::EnableVertexAttribArray(0);
             gl::EnableVertexAttribArray(1);
 
-            gl::BindBuffer(gl::ARRAY_BUFFER, parent.quad_vbo);
+            gl::BindBuffer(gl::ARRAY_BUFFER, parent.draw_quad.vbo);
 
             /// the provided pointers are of OpenGL provenance with respect to the buffer bound to quad_vbo,
             /// and not a known provenance to the Rust abstract machine, therefore we give it invalid pointers.
@@ -344,8 +347,7 @@ impl FilterPass {
             .texture_meta
             .get(&TextureSemantics::Original.semantics(0))
         {
-            eprintln!("setting original binding to {}", binding.binding);
+            FilterPass::bind_texture(binding, original, TextureSemantics::Original);
-            FilterPass::bind_texture(binding, original);
         }
 
         // bind OriginalSize
@@ -372,7 +374,7 @@ impl FilterPass {
             .get(&TextureSemantics::Source.semantics(0))
         {
             // eprintln!("setting source binding to {}", binding.binding);
-            FilterPass::bind_texture(binding, source);
+            FilterPass::bind_texture(binding, source, TextureSemantics::Source);
         }
 
         // bind SourceSize
@@ -391,14 +393,60 @@ impl FilterPass {
             );
         }
 
-        for (index, output) in parent.output_textures[0..pass_index].iter().enumerate() {
+
+        if let Some(binding) = self.reflection.meta.texture_meta.get(&TextureSemantics::OriginalHistory.semantics(0)) {
+            FilterPass::bind_texture(binding, original, TextureSemantics::OriginalHistory);
+        }
+        if let Some((location, offset)) = self
+            .variable_bindings
+            .get(&TextureSemantics::OriginalHistory.semantics(0).into())
+        {
+            let (buffer, offset) = match offset {
+                MemberOffset::Ubo(offset) => (&mut self.uniform_buffer, *offset),
+                MemberOffset::PushConstant(offset) => (&mut self.push_buffer, *offset),
+            };
+            FilterPass::build_vec4(
+                location.location(),
+                &mut buffer[offset..][..16],
+                original.image.size,
+            );
+        }
+
+        for (index, output) in parent.history_textures.iter().enumerate() {
+            if let Some(binding) = self
+                .reflection
+                .meta
+                .texture_meta
+                .get(&TextureSemantics::OriginalHistory.semantics(index + 1))
+            {
+                FilterPass::bind_texture(binding, output, TextureSemantics::OriginalHistory);
+            }
+
+            if let Some((location, offset)) = self
+                .variable_bindings
+                .get(&TextureSemantics::OriginalHistory.semantics(index + 1).into())
+            {
+                let (buffer, offset) = match offset {
+                    MemberOffset::Ubo(offset) => (&mut self.uniform_buffer, *offset),
+                    MemberOffset::PushConstant(offset) => (&mut self.push_buffer, *offset),
+                };
+                FilterPass::build_vec4(
+                    location.location(),
+                    &mut buffer[offset..][..16],
+                    output.image.size,
+                );
+            }
+        }
+
+        // PassOutput
+        for (index, output) in parent.output_textures.iter().enumerate() {
             if let Some(binding) = self
                 .reflection
                 .meta
                 .texture_meta
                 .get(&TextureSemantics::PassOutput.semantics(index))
             {
-                FilterPass::bind_texture(binding, output);
+                FilterPass::bind_texture(binding, output, TextureSemantics::PassOutput);
             }
 
             if let Some((location, offset)) = self
@@ -417,20 +465,32 @@ impl FilterPass {
             }
         }
 
-        // // todo: history
+        // PassFeedback
-        //
+        for (index, feedback) in parent.feedback_textures.iter().enumerate() {
-        // // if let Some(binding) = self.reflection.meta.texture_meta.get(&TextureSemantics::OriginalHistory.semantics(0)) {
+            if let Some(binding) = self
-        // //     FilterPass::set_texture(binding, original);
+                .reflection
-        // // }
+                .meta
-        // // if let Some(variable) = self.reflection.meta.texture_size_meta.get(&TextureSemantics::OriginalHistory.semantics(0)) {
+                .texture_meta
-        // //     let location = self.locations.get(&variable.id).expect("variable did not have location mapped").location();
+                .get(&TextureSemantics::PassFeedback.semantics(index))
-        // //     let (buffer, offset) = match variable.offset {
+            {
-        // //         MemberOffset::Ubo(offset) => (&mut self.uniform_buffer, offset),
+                FilterPass::bind_texture(binding, feedback, TextureSemantics::PassFeedback);
-        // //         MemberOffset::PushConstant(offset) => (&mut self.push_buffer, offset)
+            }
-        // //     };
+
-        // //     FilterPass::build_vec4(location, &mut buffer[offset..][..4], original.image.size);
+            if let Some((location, offset)) = self
-        // // }
+                .variable_bindings
-        //
+                .get(&TextureSemantics::PassFeedback.semantics(index).into())
+            {
+                let (buffer, offset) = match offset {
+                    MemberOffset::Ubo(offset) => (&mut self.uniform_buffer, *offset),
+                    MemberOffset::PushConstant(offset) => (&mut self.push_buffer, *offset),
+                };
+                FilterPass::build_vec4(
+                    location.location(),
+                    &mut buffer[offset..][..16],
+                    feedback.image.size,
+                );
+            }
+        }
 
         // bind float parameters
         for (id, (location, offset)) in
@@ -475,7 +535,7 @@ impl FilterPass {
                 .texture_meta
                 .get(&TextureSemantics::User.semantics(*index))
             {
-                FilterPass::bind_texture(binding, lut);
+                FilterPass::bind_texture(binding, lut, TextureSemantics::User);
             }
 
             if let Some((location, offset)) = self
@@ -493,7 +553,5 @@ impl FilterPass {
                 );
             }
         }
-
-        // // todo history
     }
 }

librashader-runtime-gl/src/framebuffer.rs

@@ -1,6 +1,6 @@
 use crate::util;
 use crate::util::{GlImage, Size, Texture, Viewport};
-use gl::types::{GLenum, GLsizei, GLuint};
+use gl::types::{GLenum, GLint, GLsizei, GLuint};
 use librashader::{FilterMode, ShaderFormat, WrapMode};
 use librashader_presets::{Scale2D, ScaleType, Scaling};
 
@@ -131,7 +131,68 @@ impl Framebuffer {
         size
     }
 
-    fn init(&mut self, mut size: Size, format: impl Into<GLenum>) {
+    pub(crate) fn is_initialized(&self) -> bool {
+        self.init
+    }
+
+    pub fn clear(&self) {
+        unsafe {
+            gl::BindFramebuffer(gl::FRAMEBUFFER, self.handle);
+            gl::ColorMask(gl::TRUE, gl::TRUE, gl::TRUE, gl::TRUE);
+            gl::ClearColor(0.0, 0.0, 0.0, 0.0);
+            gl::Clear(gl::COLOR_BUFFER_BIT);
+            gl::BindFramebuffer(gl::FRAMEBUFFER, 0);
+        }
+    }
+
+    pub fn copy_from(&mut self, image: &GlImage) {
+        if image.size != self.size || image.format != self.format {
+            self.init(image.size, image.format);
+        }
+
+        unsafe {
+            gl::BindFramebuffer(gl::FRAMEBUFFER, self.handle);
+
+            gl::FramebufferTexture2D(gl::READ_FRAMEBUFFER,
+                                     gl::COLOR_ATTACHMENT0,
+                                     gl::TEXTURE_2D,
+                                     image.handle, 0);
+
+            gl::FramebufferTexture2D(gl::DRAW_FRAMEBUFFER,
+                                     gl::COLOR_ATTACHMENT1,
+                                     gl::TEXTURE_2D,
+                                     self.image, 0);
+            gl::DrawBuffer(gl::COLOR_ATTACHMENT1);
+            gl::BlitFramebuffer(0, 0, self.size.width as GLint, self.size.height as GLint,
+                                0, 0, self.size.width as GLint, self.size.height as GLint,
+                                gl::COLOR_BUFFER_BIT, gl::NEAREST);
+
+            // cleanup after ourselves.
+            gl::FramebufferTexture2D(gl::READ_FRAMEBUFFER,
+                                     gl::COLOR_ATTACHMENT0,
+                                     gl::TEXTURE_2D,
+                                     0, 0);
+
+            gl::FramebufferTexture2D(gl::DRAW_FRAMEBUFFER,
+                                     gl::COLOR_ATTACHMENT1,
+                                     gl::TEXTURE_2D,
+                                     0, 0);
+
+            // set this back to color_attachment 0
+            gl::FramebufferTexture2D(
+                gl::FRAMEBUFFER,
+                gl::COLOR_ATTACHMENT0,
+                gl::TEXTURE_2D,
+                self.image,
+                0,
+            );
+
+            gl::BindFramebuffer(gl::FRAMEBUFFER, 0);
+        }
+    }
+    // todo: fix panic
+    pub(crate) fn init(&mut self, mut size: Size, format: impl Into<GLenum>) {
+        self.init = false;
         self.format = format.into();
         self.size = size;
 

librashader-runtime-gl/src/hello_triangle.rs

@@ -10,8 +10,8 @@ use crate::filter_chain::FilterChain;
 use crate::framebuffer::Framebuffer;
 use crate::util::{GlImage, Size, Viewport};
 
-const WIDTH: u32 = 900;
+const WIDTH: u32 = 1920;
-const HEIGHT: u32 = 700;
+const HEIGHT: u32 = 1080;
 const TITLE: &str = "Hello From OpenGL World!";
 
 pub fn compile_program(vertex: &str, fragment: &str) -> GLuint {
@@ -102,7 +102,7 @@ extern "system" fn debug_callback(
 ) {
     unsafe {
         let message = CStr::from_ptr(message);
-        eprintln!("{message:?}");
+        println!("[gl] {message:?}");
     }
 }
 
@@ -414,7 +414,9 @@ pub fn do_loop(
         }
 
         let fullscreen_fbo = [
-            -1.0f32, -1.0, 0.0, 1.0, -1.0, 0.0, -1.0, 1.0, 0.0, -1.0, 1.0, 0.0, 1.0, -1.0, 0.0,
+            -1.0f32, -1.0, 0.0, 1.0,
+            -1.0, 0.0, -1.0, 1.0, 0.0,
+            -1.0, 1.0, 0.0, 1.0, -1.0, 0.0,
             1.0, 1.0, 0.0,
         ];
 
@@ -459,17 +461,21 @@ void main()
         gl::GenVertexArrays(1, &mut quad_vao);
     }
 
-    let fb = Framebuffer::new_from_raw(
+    let (fb_width, fb_height) = window.get_framebuffer_size();
+    let (vp_width, vp_height) = window.get_size();
+
+    let output = Framebuffer::new_from_raw(
         output_texture,
         output_framebuffer_handle,
         gl::RGBA8,
         Size {
-            width: WIDTH,
+            width: vp_width as u32,
-            height: HEIGHT,
+            height: vp_height as u32,
         },
         1,
     );
 
+
     while !window.should_close() {
         glfw.poll_events();
         for (_, event) in glfw::flush_messages(&events) {
@@ -479,7 +485,7 @@ void main()
         unsafe {
             // render to fb
             gl::BindFramebuffer(gl::FRAMEBUFFER, rendered_framebuffer);
-            gl::Viewport(0, 0, WIDTH as GLsizei, HEIGHT as GLsizei);
+            gl::Viewport(0, 0, vp_width, vp_height);
 
             // clear color
             clear_color(Color(0.3, 0.4, 0.6, 1.0));
@@ -500,24 +506,28 @@ void main()
             gl::BindFramebuffer(gl::FRAMEBUFFER, 0);
         }
 
-        unsafe {
+        let viewport = Viewport {
-            filter.frame(
-                framecount,
-                &Viewport {
             x: 0,
             y: 0,
-                    output: &fb,
+            output: &output,
             mvp: None,
-                },
+        };
-                GlImage {
+
+        let rendered = GlImage {
             handle: rendered_texture,
             format: gl::RGBA8,
             size: Size {
-                        width: WIDTH,
+                width: fb_width as u32,
-                        height: HEIGHT,
+                height: fb_height as u32,
             },
             padded_size: Default::default(),
-                },
+        };
+
+        unsafe {
+            filter.frame(
+                framecount,
+                &viewport,
+                &rendered,
                 false,
             )
         }
@@ -561,6 +571,9 @@ fn glfw_handle_event(window: &mut glfw::Window, event: glfw::WindowEvent) {
         Event::Key(Key::Escape, _, Action::Press, _) => {
             window.set_should_close(true);
         }
+        Event::Size(width, height) => {
+            window.set_size(width, height)
+        }
         _ => {}
     }
 }

librashader-runtime-gl/src/lib.rs

@@ -8,6 +8,7 @@ mod framebuffer;
 mod hello_triangle;
 mod render_target;
 mod util;
+mod quad_render;
 
 #[cfg(test)]
 mod tests {
@@ -17,7 +18,7 @@ mod tests {
     #[test]
     fn triangle() {
         let (glfw, window, events, shader, vao) = hello_triangle::setup();
-        let mut filter = FilterChain::load("../test/slang-shaders/crt/crt-geom.slangp").unwrap();
+        let mut filter = FilterChain::load("../test/slang-shaders/bezel/Mega_Bezel/Presets/MBZ__0__SMOOTH-ADV-GLASS.slangp").unwrap();
 
         // FilterChain::load("../test/slang-shaders/crt/crt-royale.slangp").unwrap();
 

librashader-runtime-gl/src/quad_render.rs

@@ -0,0 +1,35 @@
+use gl::types::{GLsizeiptr, GLuint};
+
+
+#[rustfmt::skip]
+static QUAD_VBO_DATA: &[f32; 16] = &[
+    0.0f32, 0.0f32, 0.0f32, 0.0f32,
+    1.0f32, 0.0f32, 1.0f32, 0.0f32,
+    0.0f32, 1.0f32, 0.0f32, 1.0f32,
+    1.0f32, 1.0f32, 1.0f32, 1.0f32,
+];
+
+pub struct DrawQuad {
+    pub vbo: GLuint
+}
+
+impl DrawQuad {
+    pub fn new() -> DrawQuad {
+        let mut vbo = 0;
+        unsafe {
+            gl::GenBuffers(1, &mut vbo);
+            gl::BindBuffer(gl::ARRAY_BUFFER, vbo);
+            gl::BufferData(
+                gl::ARRAY_BUFFER,
+                std::mem::size_of_val(QUAD_VBO_DATA) as GLsizeiptr,
+                QUAD_VBO_DATA.as_ptr().cast(),
+                gl::STATIC_DRAW,
+            );
+            gl::BindBuffer(gl::ARRAY_BUFFER, 0);
+        }
+
+        DrawQuad {
+            vbo
+        }
+    }
+}

librashader-runtime-gl/src/render_target.rs

@@ -1,5 +1,5 @@
 use crate::framebuffer::Framebuffer;
-use crate::util::Viewport;
+use crate::util::{Texture, Viewport};
 
 #[rustfmt::skip]
 static DEFAULT_MVP: &[f32] = &[

librashader-runtime-gl/src/util.rs

@@ -92,53 +92,6 @@ where
     }
 }
 
-
-pub struct AllocRingBuffer<T> {
-    items: Box<[T]>,
-    index: usize
-}
-
-impl<T> AllocRingBuffer<T>
-    where
-        T: Default,
-{
-    pub fn new(len: usize) -> Self {
-        let mut items = Vec::new();
-        items.resize_with(len, T::default);
-
-        Self {
-            items: items.into_boxed_slice(),
-            index: 0,
-        }
-    }
-
-    pub fn items(&self) -> &[T] {
-        &self.items
-    }
-
-    pub fn items_mut(&mut self) -> &mut [T] {
-        &mut self.items
-    }
-}
-
-impl <T> RingBuffer<T> for AllocRingBuffer<T> {
-    fn current(&self) -> &T {
-        &self.items[self.index]
-    }
-
-    fn current_mut(&mut self) -> &mut T {
-        &mut self.items[self.index]
-    }
-
-    fn next(&mut self) {
-        self.index += 1;
-        if self.index >= self.items.len() {
-            self.index = 0
-        }
-    }
-}
-
-
 pub unsafe fn gl_compile_shader(stage: GLenum, source: &str) -> GLuint {
     let shader = gl::CreateShader(stage);
     gl::ShaderSource(