start refactoring wgpu code to allow for different upscale filters

uw8-window/src/crt.wgsl

@@ -14,10 +14,11 @@ fn vs_main(
     @builtin(vertex_index) in_vertex_index: u32,
 ) -> VertexOutput {
     var out: VertexOutput;
-    let x = (1.0 - f32(in_vertex_index)) * 3.0;
-    let y = f32(in_vertex_index & 1u) * 3.0 - 1.0;
-    out.clip_position = vec4<f32>(x, y, 0.0, 1.0);
-    out.tex_coords = vec2<f32>(x, y) * uniforms.texture_scale.xy + vec2<f32>(160.0, 120.0);
+    let i = in_vertex_index / 3u + in_vertex_index % 3u;
+    let x = -1.0 + f32(i % 2u) * 322.0;
+    let y = -1.0 + f32(i / 2u) * 242.0;
+    out.clip_position = vec4<f32>((vec2<f32>(x, y) - vec2<f32>(160.0, 120.0)) / uniforms.texture_scale.xy, 0.0, 1.0);
+    out.tex_coords = vec2<f32>(x, y);
     return out;
 }
 
@@ -39,10 +40,6 @@ fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
     let o = vec2<f32>(0.5) - (in.tex_coords - pixel);
     let pixel = vec2<i32>(pixel);
     
-    if(pixel.x < -1 || pixel.y < -1 || pixel.x > 320 || pixel.y > 240) {
-        return vec4<f32>(0.0, 0.0, 0.0, 1.0);
-    }
-    
     let offset_x = o.xxxx + vec4<f32>(-0.125, 0.375, 0.125, -0.375) * uniforms.texture_scale.z;
     let offset_y = o.yyyy + vec4<f32>(-0.375, -0.125, 0.375, 0.125) * uniforms.texture_scale.z;
     

uw8-window/src/gpu.rs

@@ -77,54 +77,8 @@ impl Window {
             device,
             queue,
         } = self;
-        let framebuffer_texture = device.create_texture(&wgpu::TextureDescriptor {
-            size: wgpu::Extent3d {
-                width: 320,
-                height: 240,
-                depth_or_array_layers: 1,
-            },
-            mip_level_count: 1,
-            sample_count: 1,
-            dimension: wgpu::TextureDimension::D2,
-            format: wgpu::TextureFormat::R8Uint,
-            usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
-            label: None,
-        });
 
-        let palette_texture = device.create_texture(&wgpu::TextureDescriptor {
-            size: wgpu::Extent3d {
-                width: 256,
-                height: 1,
-                depth_or_array_layers: 1,
-            },
-            mip_level_count: 1,
-            sample_count: 1,
-            dimension: wgpu::TextureDimension::D1,
-            format: wgpu::TextureFormat::Rgba8UnormSrgb,
-            usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
-            label: None,
-        });
-
-        let screen_texture = device.create_texture(&wgpu::TextureDescriptor {
-            size: wgpu::Extent3d {
-                width: 320,
-                height: 240,
-                depth_or_array_layers: 1,
-            },
-            mip_level_count: 1,
-            sample_count: 1,
-            dimension: wgpu::TextureDimension::D2,
-            format: wgpu::TextureFormat::Rgba8UnormSrgb,
-            usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::RENDER_ATTACHMENT,
-            label: None,
-        });
-
-        let framebuffer_texture_view =
-            framebuffer_texture.create_view(&wgpu::TextureViewDescriptor::default());
-        let palette_texture_view =
-            palette_texture.create_view(&wgpu::TextureViewDescriptor::default());
-        let screen_texture_view =
-            screen_texture.create_view(&wgpu::TextureViewDescriptor::default());
+        let palette_screen_mode = PaletteScreenMode::new(&device);
 
         let mut uniforms = Uniforms {
             texture_scale: texture_scale_from_resolution(window.inner_size()),
@@ -136,48 +90,6 @@ impl Window {
             usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
         });
 
-        let palette_bind_group_layout =
-            device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
-                entries: &[
-                    wgpu::BindGroupLayoutEntry {
-                        binding: 0,
-                        visibility: wgpu::ShaderStages::FRAGMENT,
-                        ty: wgpu::BindingType::Texture {
-                            multisampled: false,
-                            view_dimension: wgpu::TextureViewDimension::D2,
-                            sample_type: wgpu::TextureSampleType::Uint,
-                        },
-                        count: None,
-                    },
-                    wgpu::BindGroupLayoutEntry {
-                        binding: 1,
-                        visibility: wgpu::ShaderStages::FRAGMENT,
-                        ty: wgpu::BindingType::Texture {
-                            multisampled: false,
-                            view_dimension: wgpu::TextureViewDimension::D1,
-                            sample_type: wgpu::TextureSampleType::Float { filterable: false },
-                        },
-                        count: None,
-                    },
-                ],
-                label: None,
-            });
-
-        let palette_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
-            layout: &palette_bind_group_layout,
-            entries: &[
-                wgpu::BindGroupEntry {
-                    binding: 0,
-                    resource: wgpu::BindingResource::TextureView(&framebuffer_texture_view),
-                },
-                wgpu::BindGroupEntry {
-                    binding: 1,
-                    resource: wgpu::BindingResource::TextureView(&palette_texture_view),
-                },
-            ],
-            label: None,
-        });
-
         let crt_bind_group_layout =
             device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
                 entries: &[
@@ -210,7 +122,7 @@ impl Window {
             entries: &[
                 wgpu::BindGroupEntry {
                     binding: 0,
-                    resource: wgpu::BindingResource::TextureView(&screen_texture_view),
+                    resource: wgpu::BindingResource::TextureView(&palette_screen_mode.screen_view),
                 },
                 wgpu::BindGroupEntry {
                     binding: 1,
@@ -220,41 +132,6 @@ impl Window {
             label: None,
         });
 
-        let palette_shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
-            label: None,
-            source: wgpu::ShaderSource::Wgsl(include_str!("palette.wgsl").into()),
-        });
-
-        let palette_pipeline_layout =
-            device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
-                label: None,
-                bind_group_layouts: &[&palette_bind_group_layout],
-                push_constant_ranges: &[],
-            });
-
-        let palette_pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
-            label: None,
-            layout: Some(&palette_pipeline_layout),
-            vertex: wgpu::VertexState {
-                module: &palette_shader,
-                entry_point: "vs_main",
-                buffers: &[],
-            },
-            fragment: Some(wgpu::FragmentState {
-                module: &palette_shader,
-                entry_point: "fs_main",
-                targets: &[Some(wgpu::ColorTargetState {
-                    format: wgpu::TextureFormat::Rgba8UnormSrgb,
-                    blend: None,
-                    write_mask: wgpu::ColorWrites::ALL,
-                })],
-            }),
-            primitive: Default::default(),
-            depth_stencil: None,
-            multisample: Default::default(),
-            multiview: None,
-        });
-
         let crt_shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
             label: None,
             source: wgpu::ShaderSource::Wgsl(include_str!("crt.wgsl").into()),
@@ -360,8 +237,7 @@ impl Window {
                     let next_frame = update(
                         &mut GpuFramebuffer {
                             queue: &queue,
-                            framebuffer: &framebuffer_texture,
-                            palette: &palette_texture,
+                            framebuffer: &palette_screen_mode,
                         },
                         gamepad,
                         reset,
@@ -376,25 +252,7 @@ impl Window {
                     let mut encoder = device
                         .create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });
 
-                    {
-                        let mut render_pass =
-                            encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
-                                label: None,
-                                color_attachments: &[Some(wgpu::RenderPassColorAttachment {
-                                    view: &screen_texture_view,
-                                    resolve_target: None,
-                                    ops: wgpu::Operations {
-                                        load: wgpu::LoadOp::Load,
-                                        store: true,
-                                    },
-                                })],
-                                depth_stencil_attachment: None,
-                            });
-
-                        render_pass.set_pipeline(&palette_pipeline);
-                        render_pass.set_bind_group(0, &palette_bind_group, &[]);
-                        render_pass.draw(0..3, 0..1);
-                    }
+                    palette_screen_mode.resolve_screen(&mut encoder);
 
                     {
                         let mut render_pass =
@@ -404,7 +262,12 @@ impl Window {
                                     view: &view,
                                     resolve_target: None,
                                     ops: wgpu::Operations {
-                                        load: wgpu::LoadOp::Load,
+                                        load: wgpu::LoadOp::Clear(wgpu::Color {
+                                            r: 0.0,
+                                            g: 0.0,
+                                            b: 0.0,
+                                            a: 1.0,
+                                        }),
                                         store: true,
                                     },
                                 })],
@@ -413,7 +276,7 @@ impl Window {
 
                         render_pass.set_pipeline(&render_pipeline);
                         render_pass.set_bind_group(0, &crt_bind_group, &[]);
-                        render_pass.draw(0..3, 0..1);
+                        render_pass.draw(0..6, 0..1);
                     }
 
                     queue.submit(std::iter::once(encoder.finish()));
@@ -426,51 +289,14 @@ impl Window {
 }
 
 struct GpuFramebuffer<'a> {
-    framebuffer: &'a wgpu::Texture,
-    palette: &'a wgpu::Texture,
+    framebuffer: &'a PaletteScreenMode,
     queue: &'a wgpu::Queue,
 }
 
 impl<'a> Framebuffer for GpuFramebuffer<'a> {
     fn update(&mut self, pixels: &[u8], palette: &[u8]) {
-        self.queue.write_texture(
-            wgpu::ImageCopyTexture {
-                texture: self.framebuffer,
-                mip_level: 0,
-                origin: wgpu::Origin3d::ZERO,
-                aspect: wgpu::TextureAspect::All,
-            },
-            &bytemuck::cast_slice(pixels),
-            wgpu::ImageDataLayout {
-                offset: 0,
-                bytes_per_row: NonZeroU32::new(320),
-                rows_per_image: None,
-            },
-            wgpu::Extent3d {
-                width: 320,
-                height: 240,
-                depth_or_array_layers: 1,
-            },
-        );
-        self.queue.write_texture(
-            wgpu::ImageCopyTexture {
-                texture: self.palette,
-                mip_level: 0,
-                origin: wgpu::Origin3d::ZERO,
-                aspect: wgpu::TextureAspect::All,
-            },
-            &bytemuck::cast_slice(palette),
-            wgpu::ImageDataLayout {
-                offset: 0,
-                bytes_per_row: NonZeroU32::new(256 * 4),
-                rows_per_image: None,
-            },
-            wgpu::Extent3d {
-                width: 256,
-                height: 1,
-                depth_or_array_layers: 1,
-            },
-        );
+        self.framebuffer.write_framebuffer(self.queue, pixels);
+        self.framebuffer.write_palette(self.queue, palette);
     }
 }
 
@@ -489,3 +315,211 @@ fn texture_scale_from_resolution(res: PhysicalSize<u32>) -> [f32; 4] {
 struct Uniforms {
     texture_scale: [f32; 4],
 }
+struct PaletteScreenMode {
+    framebuffer: wgpu::Texture,
+    palette: wgpu::Texture,
+    screen_view: wgpu::TextureView,
+    bind_group: wgpu::BindGroup,
+    pipeline: wgpu::RenderPipeline,
+}
+
+impl PaletteScreenMode {
+    fn new(device: &wgpu::Device) -> PaletteScreenMode {
+        let framebuffer_texture = device.create_texture(&wgpu::TextureDescriptor {
+            size: wgpu::Extent3d {
+                width: 320,
+                height: 240,
+                depth_or_array_layers: 1,
+            },
+            mip_level_count: 1,
+            sample_count: 1,
+            dimension: wgpu::TextureDimension::D2,
+            format: wgpu::TextureFormat::R8Uint,
+            usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
+            label: None,
+        });
+
+        let palette_texture = device.create_texture(&wgpu::TextureDescriptor {
+            size: wgpu::Extent3d {
+                width: 256,
+                height: 1,
+                depth_or_array_layers: 1,
+            },
+            mip_level_count: 1,
+            sample_count: 1,
+            dimension: wgpu::TextureDimension::D1,
+            format: wgpu::TextureFormat::Rgba8UnormSrgb,
+            usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
+            label: None,
+        });
+
+        let screen_texture = device.create_texture(&wgpu::TextureDescriptor {
+            size: wgpu::Extent3d {
+                width: 320,
+                height: 240,
+                depth_or_array_layers: 1,
+            },
+            mip_level_count: 1,
+            sample_count: 1,
+            dimension: wgpu::TextureDimension::D2,
+            format: wgpu::TextureFormat::Rgba8UnormSrgb,
+            usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::RENDER_ATTACHMENT,
+            label: None,
+        });
+
+        let framebuffer_texture_view =
+            framebuffer_texture.create_view(&wgpu::TextureViewDescriptor::default());
+        let palette_texture_view =
+            palette_texture.create_view(&wgpu::TextureViewDescriptor::default());
+        let screen_texture_view =
+            screen_texture.create_view(&wgpu::TextureViewDescriptor::default());
+
+        let palette_bind_group_layout =
+            device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+                entries: &[
+                    wgpu::BindGroupLayoutEntry {
+                        binding: 0,
+                        visibility: wgpu::ShaderStages::FRAGMENT,
+                        ty: wgpu::BindingType::Texture {
+                            multisampled: false,
+                            view_dimension: wgpu::TextureViewDimension::D2,
+                            sample_type: wgpu::TextureSampleType::Uint,
+                        },
+                        count: None,
+                    },
+                    wgpu::BindGroupLayoutEntry {
+                        binding: 1,
+                        visibility: wgpu::ShaderStages::FRAGMENT,
+                        ty: wgpu::BindingType::Texture {
+                            multisampled: false,
+                            view_dimension: wgpu::TextureViewDimension::D1,
+                            sample_type: wgpu::TextureSampleType::Float { filterable: false },
+                        },
+                        count: None,
+                    },
+                ],
+                label: None,
+            });
+
+        let palette_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+            layout: &palette_bind_group_layout,
+            entries: &[
+                wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: wgpu::BindingResource::TextureView(&framebuffer_texture_view),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 1,
+                    resource: wgpu::BindingResource::TextureView(&palette_texture_view),
+                },
+            ],
+            label: None,
+        });
+
+        let palette_shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
+            label: None,
+            source: wgpu::ShaderSource::Wgsl(include_str!("palette.wgsl").into()),
+        });
+
+        let palette_pipeline_layout =
+            device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+                label: None,
+                bind_group_layouts: &[&palette_bind_group_layout],
+                push_constant_ranges: &[],
+            });
+
+        let palette_pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+            label: None,
+            layout: Some(&palette_pipeline_layout),
+            vertex: wgpu::VertexState {
+                module: &palette_shader,
+                entry_point: "vs_main",
+                buffers: &[],
+            },
+            fragment: Some(wgpu::FragmentState {
+                module: &palette_shader,
+                entry_point: "fs_main",
+                targets: &[Some(wgpu::ColorTargetState {
+                    format: wgpu::TextureFormat::Rgba8UnormSrgb,
+                    blend: None,
+                    write_mask: wgpu::ColorWrites::ALL,
+                })],
+            }),
+            primitive: Default::default(),
+            depth_stencil: None,
+            multisample: Default::default(),
+            multiview: None,
+        });
+
+        PaletteScreenMode {
+            framebuffer: framebuffer_texture,
+            palette: palette_texture,
+            screen_view: screen_texture_view,
+            bind_group: palette_bind_group,
+            pipeline: palette_pipeline,
+        }
+    }
+
+    fn write_framebuffer(&self, queue: &wgpu::Queue, pixels: &[u8]) {
+        queue.write_texture(
+            wgpu::ImageCopyTexture {
+                texture: &self.framebuffer,
+                mip_level: 0,
+                origin: wgpu::Origin3d::ZERO,
+                aspect: wgpu::TextureAspect::All,
+            },
+            &bytemuck::cast_slice(pixels),
+            wgpu::ImageDataLayout {
+                offset: 0,
+                bytes_per_row: NonZeroU32::new(320),
+                rows_per_image: None,
+            },
+            wgpu::Extent3d {
+                width: 320,
+                height: 240,
+                depth_or_array_layers: 1,
+            },
+        );
+    }
+
+    fn write_palette(&self, queue: &wgpu::Queue, palette: &[u8]) {
+        queue.write_texture(
+            wgpu::ImageCopyTexture {
+                texture: &self.palette,
+                mip_level: 0,
+                origin: wgpu::Origin3d::ZERO,
+                aspect: wgpu::TextureAspect::All,
+            },
+            &bytemuck::cast_slice(palette),
+            wgpu::ImageDataLayout {
+                offset: 0,
+                bytes_per_row: NonZeroU32::new(256 * 4),
+                rows_per_image: None,
+            },
+            wgpu::Extent3d {
+                width: 256,
+                height: 1,
+                depth_or_array_layers: 1,
+            },
+        );
+    }
+
+    fn resolve_screen(&self, encoder: &mut wgpu::CommandEncoder) {
+        let mut render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+            label: None,
+            color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+                view: &self.screen_view,
+                resolve_target: None,
+                ops: wgpu::Operations {
+                    load: wgpu::LoadOp::Load,
+                    store: true,
+                },
+            })],
+            depth_stencil_attachment: None,
+        });
+
+        render_pass.set_pipeline(&self.pipeline);
+        render_pass.set_bind_group(0, &self.bind_group, &[]);
+        render_pass.draw(0..3, 0..1);
+    }
+}

uw8-window/src/main.rs

@@ -1,4 +1,4 @@
-use std::time::{Duration, Instant};
+use std::time::Instant;
 
 fn main() {
     env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();
@@ -15,13 +15,22 @@ fn main() {
         palette[i as usize] = r + (g << 8) + (b << 16);
     }
 
-    let mut prev_frame = Instant::now();
+    let mut fps_start = Instant::now();
+    let mut fps_counter = 0;
 
-    uw8_window::run(move |gpu_framebuffer, _gamepads, _reset| {
-        draw_frame(&mut framebuffer, start_time.elapsed().as_secs_f32());
+    uw8_window::run(true, move |gpu_framebuffer, _gamepads, _reset| {
+        for _ in 0..1 {
+            draw_frame(&mut framebuffer, start_time.elapsed().as_secs_f32());
+        }
         gpu_framebuffer.update(&framebuffer, bytemuck::cast_slice(&palette));
-        prev_frame += Duration::from_secs_f32(1.0 / 60.0);
-        prev_frame
+        fps_counter += 1;
+        let elapsed = fps_start.elapsed().as_secs_f32();
+        if elapsed >= 1.0 {
+            println!("{:.1} fps", fps_counter as f32 / elapsed);
+            fps_start = Instant::now();
+            fps_counter = 0;
+        }
+        Instant::now()
     });
 }