From f98b27592b2482dc89adc055073a3ee015f2424e Mon Sep 17 00:00:00 2001
From: Silas Bartha <silas@exvacuum.dev>
Date: Wed, 24 Apr 2024 14:03:15 -0400
Subject: Initial Commit

---
 src/resources.rs | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 src/resources.rs

(limited to 'src/resources.rs')

diff --git a/src/resources.rs b/src/resources.rs
new file mode 100644
index 0000000..d900f18
--- /dev/null
+++ b/src/resources.rs
@@ -0,0 +1,79 @@
+use bevy::{
+    core_pipeline::fullscreen_vertex_shader::fullscreen_shader_vertex_state,
+    prelude::*,
+    render::{
+        render_resource::{
+            binding_types::{sampler, texture_2d},
+            BindGroupLayout, BindGroupLayoutEntries, CachedRenderPipelineId, ColorTargetState,
+            ColorWrites, FragmentState, MultisampleState, PipelineCache, PrimitiveState,
+            RenderPipelineDescriptor, Sampler, SamplerBindingType, SamplerDescriptor, ShaderStages,
+            TextureFormat, TextureSampleType,
+        },
+        renderer::RenderDevice,
+        texture::BevyDefault,
+    },
+};
+
+#[derive(Resource)]
+pub struct DitherPostProcessPipeline {
+    pub layout: BindGroupLayout,
+    pub screen_sampler: Sampler,
+    pub threshold_map_sampler: Sampler,
+    pub pipeline_id: CachedRenderPipelineId,
+}
+
+impl FromWorld for DitherPostProcessPipeline {
+    fn from_world(world: &mut World) -> Self {
+        let render_device = world.resource::<RenderDevice>();
+
+        let layout = render_device.create_bind_group_layout(
+            "dither_post_process_bind_group_layout",
+            &BindGroupLayoutEntries::sequential(
+                ShaderStages::FRAGMENT,
+                (
+                    texture_2d(TextureSampleType::Float { filterable: true }),
+                    sampler(SamplerBindingType::Filtering),
+                    texture_2d(TextureSampleType::Float { filterable: true }),
+                    sampler(SamplerBindingType::Filtering),
+                ),
+            ),
+        );
+
+        let screen_sampler = render_device.create_sampler(&SamplerDescriptor::default());
+        let threshold_map_sampler = render_device.create_sampler(&SamplerDescriptor::default());
+
+        let shader = world.resource::<AssetServer>().load::<Shader>(
+            "embedded://grex_dither_post_process/../assets/shaders/dither_post_process.wgsl",
+        );
+
+        let pipeline_id =
+            world
+                .resource_mut::<PipelineCache>()
+                .queue_render_pipeline(RenderPipelineDescriptor {
+                    label: Some("dither_post_process_render_pipeline".into()),
+                    layout: vec![layout.clone()],
+                    push_constant_ranges: vec![],
+                    vertex: fullscreen_shader_vertex_state(),
+                    primitive: PrimitiveState::default(),
+                    depth_stencil: None,
+                    multisample: MultisampleState::default(),
+                    fragment: Some(FragmentState {
+                        shader,
+                        shader_defs: vec![],
+                        entry_point: "fragment".into(),
+                        targets: vec![Some(ColorTargetState {
+                            format: TextureFormat::bevy_default(),
+                            blend: None,
+                            write_mask: ColorWrites::ALL,
+                        })],
+                    }),
+                });
+
+        Self {
+            layout,
+            screen_sampler,
+            threshold_map_sampler,
+            pipeline_id,
+        }
+    }
+}
-- 
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