piping the texture attachments

Cargo.toml

@@ -33,7 +33,7 @@ toml = "0.5.8"
 cgmath = "0.18.0"
 rapier3d = { version = "0.5.0", features = ["simd-nightly", "parallel"] }
 nalgebra = "0.24.1"
-legion = "0.3.1"
+legion = "0.4.0"
 wgpu = "0.7.0"
 imgui = "0.7.0"
 imgui-wgpu = "0.14.0"

note.md

@@ -0,0 +1,26 @@
+# Texture Samplers
+|GLSL sampler|OpenGL texture enum|Texture type|
+|---|---|---|
+gsampler1D        | GL_TEXTURE_1D                   | 1D texture
+gsampler2D        | GL_TEXTURE_2D                   | 2D texture
+gsampler3D        | GL_TEXTURE_3D                   | 3D texture
+gsamplerCube      | GL_TEXTURE_CUBE_MAP             | Cubemap Texture
+gsampler2DRect    | GL_TEXTURE_RECTANGLE            | Rectangle Texture
+gsampler1DArray   | GL_TEXTURE_1D_ARRAY             | 1D Array Texture
+gsampler2DArray   | GL_TEXTURE_2D_ARRAY             | 2D Array Texture
+gsamplerCubeArray | GL_TEXTURE_CUBE_MAP_ARRAY       | Cubemap Array Texture
+gsamplerBuffer    | GL_TEXTURE_BUFFER               | Buffer Texture
+gsampler2DMS      | GL_TEXTURE_2D_MULTISAMPLE       | Multisample Texture
+gsampler2DMSArray | GL_TEXTURE_2D_MULTISAMPLE_ARRAY | Multisample Array Texture 
+
+
+# Shadow Samplers
+|GLSL sampler|OpenGL texture enum|
+|---|---|
+sampler1DShadow        | GL_TEXTURE_1D
+sampler2DShadow        | GL_TEXTURE_2D
+samplerCubeShadow      | GL_TEXTURE_CUBE_MAP
+sampler2DRectShadow    | GL_TEXTURE_RECTANGLE
+sampler1DArrayShadow   | GL_TEXTURE_1D_ARRAY
+sampler2DArrayShadow   | GL_TEXTURE_2D_ARRAY
+samplerCubeArrayShadow | GL_TEXTURE_CUBE_MAP_ARRAY

shaders/bake.vert

@@ -6,6 +6,10 @@ layout(set = 0, binding = 0) uniform Globals {
     mat4 u_ViewProj;
 };
 
+layout(set = 0, binding = 1) uniform Globals {
+    mat4 u_ViewProj;
+};
+
 layout(set = 1, binding = 0) uniform Entity {
     mat4 u_World;
     vec4 u_Color;

shaders/forward.frag

@@ -30,18 +30,23 @@ layout(set = 1, binding = 0) uniform Entity {
 };
 
 float fetch_shadow(int light_id, vec4 homogeneous_coords) {
+    // homogeneous coords is the depth of the previously rendered
+    // fragment, from the lights perspective.  If it's less than 0
+    // then it's behind the light, so it's obviously in shadow
     if (homogeneous_coords.w <= 0.0) {
         return 1.0;
     }
-    // compensate for the Y-flip difference between the NDC and texture coordinates
+    // compensate for the Y-flip difference between the normalized device
+    // coordinates (NDC) and texture coordinates
     const vec2 flip_correction = vec2(0.5, -0.5);
     // compute texture coordinates for shadow lookup
     vec4 light_local = vec4(
+        // I don't know what kind of jank shit is going on on this line
         homogeneous_coords.xy * flip_correction/homogeneous_coords.w + 0.5,
-        light_id,
-        homogeneous_coords.z / homogeneous_coords.w
+        light_id, // array layer
+        homogeneous_coords.z / homogeneous_coords.w // D-Ref
     );
-    // do the lookup, using HW PCF and comparison
+    // do the lookup, using HW percentage closer filtering(PCF) and comparison
     return texture(sampler2DArrayShadow(t_Shadow, s_Shadow), light_local);
 }
 

shaders/g_buffer_input.frag

@@ -0,0 +1,22 @@
+#version 450
+
+layout(location = 0) in vec3 v_Normal;
+layout(location = 1) in vec4 v_Position;
+layout(location = 2) in vec2 v_Uv;
+
+layout(location = 0) out vec4 o_Normal;
+layout(location = 1) out vec4 o_Position;
+layout(location = 2) out vec4 o_Uv;
+
+// so I need to have my 3 color attachments and 1? sampler.
+
+layout(set = 0, binding = 1) uniform texture2DArray t_Uv;
+layout(set = 0, binding = 2) uniform gsampler2D s_Uv;
+
+// I also need my 1 depth texture and its sampler
+layout(set = 0, binding = 3) uniform texture2DArray t_Shadow;
+layout(set = 0, binding = 4) uniform samplerShadow s_Shadow;
+
+void main() {
+
+}

shaders/g_buffer_input.vert

@@ -0,0 +1,21 @@
+#version 450
+
+layout(location = 0) in vec4 a_Pos;
+
+
+layout(location = 0) out vec3 v_Normal;
+layout(location = 1) out vec4 v_Position;
+layout(location = 2) out vec2 v_Uv;
+
+layout(set = 0, binding = 0) uniform Globals {
+    mat4 u_ViewProj;
+};
+
+layout(set = 1, binding = 0) uniform Entity {
+    mat4 u_World;
+    vec4 u_Color;
+};
+
+void main() {
+    gl_Position = u_ViewProj * u_World * vec4(a_Pos);
+}

src/render/mod.rs

@@ -66,3 +66,12 @@ pub struct ShadowUniforms {
 
 unsafe impl Pod for ShadowUniforms {}
 unsafe impl Zeroable for ShadowUniforms {}
+
+#[repr(C)]
+#[derive(Clone, Copy, Debug)]
+pub struct CameraProjectionView {
+    proj: [[f32; 4]; 4],
+}
+
+unsafe impl Pod for CameraProjectionView {}
+unsafe impl Zeroable for CameraProjectionView {}

src/render/state.rs

@@ -18,7 +18,11 @@ use legion::world::SubWorld;
 use legion::*;
 use rapier3d::parry::motion::RigidMotionComposition;
 use wgpu::util::DeviceExt;
-use wgpu::{BackendBit, BindGroup, BindGroupLayout, Buffer, BufferBindingType, Device, FragmentState, Instance, Queue, Surface, SwapChain, SwapChainDescriptor, SwapChainFrame, TextureView, VertexState, CommandEncoder};
+use wgpu::{
+    BackendBit, BindGroup, BindGroupLayout, Buffer, BufferBindingType, CommandEncoder, Device,
+    Features, FragmentState, Instance, Queue, Surface, SwapChain, SwapChainDescriptor,
+    SwapChainFrame, TextureView, VertexState,
+};
 use winit_24::dpi::PhysicalSize;
 use winit_24::platform::unix::x11::ffi::Time;
 use winit_24::window::Window;
@@ -26,24 +30,23 @@ use winit_24::window::Window;
 use crate::camera::{Camera, CameraController};
 use crate::components::{Mesh, Position, RangeCopy};
 use crate::current_ui;
-use crate::geometry::{load_obj, Vertex, RawMesh};
+use crate::geometry::{load_obj, RawMesh, Vertex};
 use crate::imgui_supp::imgui_support::{ImguiContext, ImguiPlatform};
 use crate::light::{DirectionalLight, LightRaw};
-use crate::render::{EntityUniforms, ShadowUniforms, ForwardUniforms};
-
+use crate::render::{CameraProjectionView, EntityUniforms, ForwardUniforms, ShadowUniforms};
 
 /// A render pass consists of a pipeline, bindgroup, and uniform buf
 /// The uniform buf is just the ShadowUniforms or ForwardUniforms
+///     They are uniform across all cu's.
 /// And the bindgroup is just the localbindgroup (the EntityUniforms) and the rest
+///
 pub struct Pass {
     pub pipeline: wgpu::RenderPipeline,
     pub bind_group: wgpu::BindGroup,
     pub uniform_buf: wgpu::Buffer,
 }
 
-
 pub struct RenderState {
-
     swapchain: SwapChain,
     swapchain_description: SwapChainDescriptor,
     instance: Arc<Instance>,
@@ -61,6 +64,15 @@ pub struct RenderState {
     pub(in crate::render) forward_pass: Pass,
     pub(in crate::render) forward_depth: wgpu::TextureView,
 
+    // Gbuffer bs
+    pub(in crate::render) gbuffer_pass: Pass,
+    pub(in crate::render) gbuffer_cam_projection_buffer: wgpu::Buffer,
+    pub(in crate::render) gbuffer_depth_texture: wgpu::TextureView,
+    pub(in crate::render) gbuffer_depth_views: Vec<Arc<TextureView>>,
+    pub(in crate::render) gbuffer_target_texture: wgpu::TextureView,
+    pub(in crate::render) gbuffer_target_views: Vec<Arc<TextureView>>,
+
+    // this is for the set=1 entity uniforms
     entity_bind_group_layout: BindGroupLayout,
 
     pub(in crate::render) light_uniform_buf: wgpu::Buffer,
@@ -73,12 +85,14 @@ pub struct RenderState {
 impl RenderState {
     const MAX_LIGHTS: usize = 10;
     const SHADOW_FORMAT: wgpu::TextureFormat = wgpu::TextureFormat::Depth32Float;
+    const G_BUFFER_FORMAT: wgpu::TextureFormat = wgpu::TextureFormat::Rgba32Float;
+    const DEPTH_FORMAT: wgpu::TextureFormat = wgpu::TextureFormat::Depth32Float;
+
     const SHADOW_SIZE: wgpu::Extent3d = wgpu::Extent3d {
         width: 1024,
         height: 1024,
         depth: Self::MAX_LIGHTS as u32,
     };
-    const DEPTH_FORMAT: wgpu::TextureFormat = wgpu::TextureFormat::Depth32Float;
 
     /// Generate a projection matrix with no look-at yet
     pub fn generate_matrix(&self) -> cgmath::Matrix4<f32> {
@@ -109,10 +123,7 @@ impl RenderState {
     }
 
     /// Create a buffer for a mesh
-    fn create_buffer(
-        device: &wgpu::Device,
-        raw_mesh: &RawMesh,
-    ) -> (Arc<Buffer>, Arc<Buffer>) {
+    fn create_buffer(device: &wgpu::Device, raw_mesh: &RawMesh) -> (Arc<Buffer>, Arc<Buffer>) {
         let vertex_buf = Arc::new(
             device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
                 label: Some("vertex-buffer"),
@@ -133,8 +144,11 @@ impl RenderState {
     }
 
     /// Take a meshes raw representation and upload it to a GPU buffer
-    pub fn upload_mesh_to_buffer(&mut self, mesh: &RawMesh, color: Option<wgpu::Color>) -> Result<Mesh, String>  {
-
+    pub fn upload_mesh_to_buffer(
+        &mut self,
+        mesh: &RawMesh,
+        color: Option<wgpu::Color>,
+    ) -> Result<Mesh, String> {
         let index_count = mesh.indices.len() * 3; // TODO bad bad bad bad!
 
         let (vertex_buf, index_buf) = RenderState::create_buffer(&self.device, mesh);
@@ -174,7 +188,11 @@ impl RenderState {
     }
 
     /// explicitly load from file, and upload to gpu the mesh
-    pub fn load_mesh_to_buffer(&mut self, filepath: &str, color: Option<wgpu::Color>) -> Result<Mesh, String> {
+    pub fn load_mesh_to_buffer(
+        &mut self,
+        filepath: &str,
+        color: Option<wgpu::Color>,
+    ) -> Result<Mesh, String> {
         let raw_mesh = load_obj(filepath)?;
         self.upload_mesh_to_buffer(&raw_mesh, color)
     }
@@ -205,6 +223,105 @@ impl RenderState {
         }
     }
 
+    // Create a render pass with the ability to add external bindings
+    pub fn create_render_pass(
+        device: &Device,
+        external_binding_layout: &BindGroupLayout,
+        vertex_description: &wgpu::VertexBufferLayout,
+        uniform_size: u64,
+        label: Option<&str>,
+    ) -> Option<Pass> {
+        // The g-buffers camera projection matrix that we stream data to
+        let uniform_buf = device.create_buffer(&wgpu::BufferDescriptor {
+            label: Some(format!("{} uniform-buffer", label.unwrap_or("unnamed")).as_str()),
+            size: uniform_size,
+            usage: wgpu::BufferUsage::UNIFORM | wgpu::BufferUsage::COPY_DST,
+            mapped_at_creation: false,
+        });
+
+        // Uniform bind group for the view matrix
+        let bind_group_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+            label: Some(format!("{} bind group layout", label.unwrap_or("unnamed")).as_str()),
+            entries: &[wgpu::BindGroupLayoutEntry {
+                binding: 0, // global
+                visibility: wgpu::ShaderStage::VERTEX,
+                ty: wgpu::BindingType::Buffer {
+                    ty: wgpu::BufferBindingType::Uniform,
+                    min_binding_size: wgpu::BufferSize::new(uniform_size),
+                    has_dynamic_offset: false,
+                },
+                count: None,
+            }],
+        });
+
+        let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+            label: Some(format!("{} uniform bind group", label.unwrap_or("unnamed")).as_str()),
+            layout: &bind_group_layout,
+            entries: &[wgpu::BindGroupEntry {
+                binding: 0,
+                resource: wgpu::BindingResource::Buffer {
+                    buffer: &uniform_buf,
+                    offset: 0,
+                    size: wgpu::BufferSize::new(uniform_size),
+                },
+            }],
+        });
+
+        let vs_module =
+            device.create_shader_module(&wgpu::include_spirv!("../../shaders/bake.vert.spv"));
+        let fs_module =
+            device.create_shader_module(&wgpu::include_spirv!("../../shaders/bake.frag.spv"));
+
+        // The bind group layouts are accessed by layout(set = X, binding = x)
+        // in the shader.
+        let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+            label: Some(format!("{} pipeline layout", label.unwrap_or("unnamed")).as_str()),
+            bind_group_layouts: &[&bind_group_layout, external_binding_layout],
+            push_constant_ranges: &[],
+        });
+
+        let pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+            label: Some(format!("{} render pipeline", label.unwrap_or("unnamed")).as_str()),
+            layout: Some(&pipeline_layout),
+
+            vertex: VertexState {
+                module: &vs_module,
+                entry_point: "main",
+                buffers: &[vertex_description.clone()],
+            },
+            fragment: Some(FragmentState {
+                module: &fs_module,
+                entry_point: "main",
+                targets: &[],
+            }),
+            primitive: wgpu::PrimitiveState {
+                topology: wgpu::PrimitiveTopology::TriangleList,
+                front_face: wgpu::FrontFace::Ccw,
+                cull_mode: wgpu::CullMode::Back,
+                ..Default::default()
+            },
+            depth_stencil: Some(wgpu::DepthStencilState {
+                format: wgpu::TextureFormat::Depth32Float,
+                depth_write_enabled: true,
+                depth_compare: wgpu::CompareFunction::LessEqual,
+                stencil: wgpu::StencilState::default(),
+                bias: wgpu::DepthBiasState {
+                    constant: 2, // corresponds to bilinear filtering
+                    slope_scale: 2.0,
+                    clamp: 0.0,
+                },
+                clamp_depth: device.features().contains(wgpu::Features::DEPTH_CLAMPING),
+            }),
+            multisample: wgpu::MultisampleState::default(),
+        });
+
+        Some(Pass {
+            pipeline,
+            bind_group,
+            uniform_buf,
+        })
+    }
+
     pub fn init(window: &Window, imgui_context: &mut ImguiContext) -> RenderState {
         // Grab the GPU instance, and query its features
         let instance = wgpu::Instance::new(wgpu::BackendBit::PRIMARY);
@@ -292,10 +409,149 @@ impl RenderState {
             });
 
         /*
-        There appear to be two passes required for shadows, the shadow pass, and the forward pass
-        Need to open this up in renderdoc and see what it's actually doing
+        The shadow pass renders from the perspective of each camera and applies that to the shadow
+        texture. Due to light FOV and the shadow texture itself, it's rather difficult to have
+        hands-off global lighting / point lights
          */
 
+        // This pass is just going to forward the vertex info to the fragments
+        // And they are going to render to the gbuffer
+        let g_buffer_pass = Self::create_render_pass(
+            &device,
+            &entity_bind_group_layout,
+            &vb_desc,
+            mem::size_of::<CameraProjectionView>() as wgpu::BufferAddress,
+            Some("g-buffer"),
+        );
+
+        let shadow_pass = Self::create_render_pass(
+            &device,
+            &entity_bind_group_layout,
+            &vb_desc,
+            mem::size_of::<ShadowUniforms>() as wgpu::BufferAddress,
+            Some("shadow-pass"),
+        );
+
+        let g_buffer_pass = {
+            let uniform_size = mem::size_of::<CameraProjectionView>() as wgpu::BufferAddress;
+
+            // The g-buffers camera projection matrix that we stream data to
+            let uniform_buf = device.create_buffer(&wgpu::BufferDescriptor {
+                label: Some("g-buffers CameraProjectionView uniform buffer"),
+                size: uniform_size,
+                usage: wgpu::BufferUsage::UNIFORM | wgpu::BufferUsage::COPY_DST,
+                mapped_at_creation: false,
+            });
+
+            // Uniform bind group for the view matrix
+            let bind_group_layout =
+                device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+                    label: Some("g-buffer input pass bindgroup layout (cam)"),
+                    entries: &[
+                        wgpu::BindGroupLayoutEntry {
+                            binding: 0, // global
+                            visibility: wgpu::ShaderStage::VERTEX,
+                            ty: wgpu::BindingType::Buffer {
+                                ty: wgpu::BufferBindingType::Uniform,
+                                min_binding_size: wgpu::BufferSize::new(uniform_size),
+                                has_dynamic_offset: false,
+                            },
+                            count: None,
+                        },
+                        wgpu::BindGroupLayoutEntry {
+                            binding: 1, // texture2DArray
+                            visibility: wgpu::ShaderStage::FRAGMENT,
+                            ty: wgpu::BindingType::Texture {
+                                multisampled: false,
+                                sample_type: wgpu::TextureSampleType::Depth,
+                                view_dimension: wgpu::TextureViewDimension::D2Array,
+                            },
+                            count: None,
+                        },
+                        wgpu::BindGroupLayoutEntry {
+                            binding: 2, // samplerShadow
+                            visibility: wgpu::ShaderStage::FRAGMENT,
+                            ty: wgpu::BindingType::Sampler {
+                                filtering: false,
+                                comparison: true,
+                            },
+                            count: None,
+                        },
+                    ],
+                });
+
+            //sudo rm /usr/bin/ld
+            //sudo ln -s /usr/bin/lld /usr/bin/ld
+            //sudo ln -s /usr/bin/x86_64-linux-gnu-ld /usr/bin/ld
+
+            let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+                label: Some("g-buffers uniform bind group"),
+                layout: &bind_group_layout,
+                entries: &[wgpu::BindGroupEntry {
+                    binding: 0, // globals
+                    resource: wgpu::BindingResource::Buffer {
+                        buffer: &uniform_buf,
+                        offset: 0,
+                        size: wgpu::BufferSize::new(uniform_size),
+                    },
+                }],
+            });
+
+            let vs_module =
+                device.create_shader_module(&wgpu::include_spirv!("../../shaders/bake.vert.spv"));
+            let fs_module =
+                device.create_shader_module(&wgpu::include_spirv!("../../shaders/bake.frag.spv"));
+
+            // The bind group layouts are accessed by layout(set = X, binding = x)
+            // in the shader.
+            let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+                label: Some("g-buffer input pipeline layout"),
+                bind_group_layouts: &[&bind_group_layout, &entity_bind_group_layout],
+                push_constant_ranges: &[],
+            });
+
+            let pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+                label: Some("g-buffer"),
+                layout: Some(&pipeline_layout),
+
+                vertex: VertexState {
+                    module: &vs_module,
+                    entry_point: "main",
+                    buffers: &[vb_desc.clone()],
+                },
+                fragment: Some(FragmentState {
+                    module: &fs_module,
+                    entry_point: "main",
+                    targets: &[],
+                }),
+                primitive: wgpu::PrimitiveState {
+                    topology: wgpu::PrimitiveTopology::TriangleList,
+                    front_face: wgpu::FrontFace::Ccw,
+                    cull_mode: wgpu::CullMode::Back,
+                    ..Default::default()
+                },
+                depth_stencil: Some(wgpu::DepthStencilState {
+                    format: wgpu::TextureFormat::Depth32Float,
+                    depth_write_enabled: true,
+                    depth_compare: wgpu::CompareFunction::LessEqual,
+                    stencil: wgpu::StencilState::default(),
+                    bias: wgpu::DepthBiasState {
+                        constant: 2, // corresponds to bilinear filtering
+                        slope_scale: 2.0,
+                        clamp: 0.0,
+                    },
+                    clamp_depth: device.features().contains(wgpu::Features::DEPTH_CLAMPING),
+                }),
+                multisample: wgpu::MultisampleState::default(),
+            });
+
+            Pass {
+                pipeline,
+                bind_group,
+                uniform_buf,
+            }
+        };
+
         let shadow_pass = {
             let uniform_size = mem::size_of::<ShadowUniforms>() as wgpu::BufferAddress;
 
@@ -346,9 +602,9 @@ impl RenderState {
 
             // Create the render pipeline
             let vs_module =
-                device.create_shader_module(&wgpu::include_spirv!("../../resources/bake.vert.spv"));
+                device.create_shader_module(&wgpu::include_spirv!("../../shaders/bake.vert.spv"));
             let fs_module =
-                device.create_shader_module(&wgpu::include_spirv!("../../resources/bake.frag.spv"));
+                device.create_shader_module(&wgpu::include_spirv!("../../shaders/bake.frag.spv"));
 
             let pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
                 label: Some("shadow"),
@@ -392,6 +648,19 @@ impl RenderState {
             }
         };
 
+        // Pre init the gbuffers camera projection uniform
+        let gbuffer_cam_uniform_size =
+            mem::size_of::<CameraProjectionView>() as wgpu::BufferAddress;
+
+        let gbuffer_cam_uniform_buf = device.create_buffer(&wgpu::BufferDescriptor {
+            label: Some("g-buffer camera projection uniform buffer"),
+            size: gbuffer_cam_uniform_size,
+            usage: wgpu::BufferUsage::UNIFORM
+                | wgpu::BufferUsage::COPY_SRC
+                | wgpu::BufferUsage::COPY_DST,
+            mapped_at_creation: false,
+        });
+
         // Pre init the light uniform, with slots enough for MAX_LIGHTS
         let light_uniform_size =
             (Self::MAX_LIGHTS * mem::size_of::<LightRaw>()) as wgpu::BufferAddress;
@@ -437,8 +706,22 @@ impl RenderState {
             50.0,
         );
 
+        let g_buffer_camera_projection_matrix = CameraProjectionView {
+            proj: *mx_projection.as_ref(),
+        };
+
+        let g_buffer_camera_projection_uniform =
+            device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+                label: Some("g-buffer camera projection uniform buffer"),
+                contents: bytemuck::bytes_of(&g_buffer_camera_projection_matrix),
+                usage: wgpu::BufferUsage::UNIFORM | wgpu::BufferUsage::COPY_DST,
+            });
+
         let forward_pass = {
             // Create pipeline layout
+            let forward_uniform_size =
+                mem::size_of::<ForwardUniforms>() as wgpu::BufferAddress;
+
             let bind_group_layout =
                 device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
                     entries: &[
@@ -447,11 +730,7 @@ impl RenderState {
                             visibility: wgpu::ShaderStage::VERTEX | wgpu::ShaderStage::FRAGMENT,
                             ty: wgpu::BindingType::Buffer {
                                 ty: wgpu::BufferBindingType::Uniform,
-                                min_binding_size: wgpu::BufferSize::new(mem::size_of::<
-                                    ForwardUniforms,
-                                >(
-                                )
-                                    as _),
+                                min_binding_size: wgpu::BufferSize::new(forward_uniform_size),
                                 has_dynamic_offset: false,
                             },
                             count: None,
@@ -467,7 +746,7 @@ impl RenderState {
                             count: None,
                         },
                         wgpu::BindGroupLayoutEntry {
-                            binding: 2,
+                            binding: 2, // texture2DArray
                             visibility: wgpu::ShaderStage::FRAGMENT,
                             ty: wgpu::BindingType::Texture {
                                 multisampled: false,
@@ -477,7 +756,7 @@ impl RenderState {
                             count: None,
                         },
                         wgpu::BindGroupLayoutEntry {
-                            binding: 3,
+                            binding: 3, // samplerShadow
                             visibility: wgpu::ShaderStage::FRAGMENT,
                             ty: wgpu::BindingType::Sampler {
                                 filtering: false,
@@ -559,10 +838,10 @@ impl RenderState {
             });
 
             // Create the render pipeline
-            let vs_module =
-                device.create_shader_module(&wgpu::include_spirv!("../../resources/forward.vert.spv"));
-            let fs_module =
-                device.create_shader_module(&wgpu::include_spirv!("../../resources/forward.frag.spv"));
+            let vs_module = device
+                .create_shader_module(&wgpu::include_spirv!("../../shaders/forward.vert.spv"));
+            let fs_module = device
+                .create_shader_module(&wgpu::include_spirv!("../../shaders/forward.frag.spv"));
 
             let pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
                 label: Some("main"),
@@ -600,7 +879,7 @@ impl RenderState {
             }
         };
 
-        let depth_texture = device.create_texture(&wgpu::TextureDescriptor {
+        let forward_depth_texture = device.create_texture(&wgpu::TextureDescriptor {
             size: wgpu::Extent3d {
                 width: sc_desc.width,
                 height: sc_desc.height,
@@ -611,9 +890,73 @@ impl RenderState {
             dimension: wgpu::TextureDimension::D2,
             format: Self::DEPTH_FORMAT,
             usage: wgpu::TextureUsage::RENDER_ATTACHMENT,
-            label: Some("Depth Texture"),
+            label: Some("Forward Depth Texture"),
         });
 
+        let g_buffer_depth_texture = device.create_texture(&wgpu::TextureDescriptor {
+            size: wgpu::Extent3d {
+                width: sc_desc.width,
+                height: sc_desc.height,
+                depth: 5,
+            },
+            mip_level_count: 1,
+            sample_count: 1,
+            dimension: wgpu::TextureDimension::D2,
+            format: Self::DEPTH_FORMAT,
+            usage: wgpu::TextureUsage::RENDER_ATTACHMENT | wgpu::TextureUsage::SAMPLED,
+            label: Some("g-buffer depth texture"),
+        });
+
+        // I need one of these for each of the g-buffer elements I'm calculating
+        let mut g_buffer_depth_texture_views = (0..4)
+            .map(|i| {
+                Arc::new(
+                    g_buffer_depth_texture.create_view(&wgpu::TextureViewDescriptor {
+                        label: Some("g-buffer depth texture"),
+                        format: None,
+                        dimension: Some(wgpu::TextureViewDimension::D2),
+                        aspect: wgpu::TextureAspect::All,
+                        base_mip_level: 0,
+                        level_count: None,
+                        base_array_layer: i as u32,
+                        array_layer_count: NonZeroU32::new(1),
+                    }),
+                )
+            })
+            .collect::<Vec<_>>();
+
+        let g_buffer_data_texture = device.create_texture(&wgpu::TextureDescriptor {
+            size: wgpu::Extent3d {
+                width: sc_desc.width,
+                height: sc_desc.height,
+                depth: 5,
+            },
+            mip_level_count: 1,
+            sample_count: 1,
+            dimension: wgpu::TextureDimension::D2,
+            format: Self::DEPTH_FORMAT,
+            usage: wgpu::TextureUsage::RENDER_ATTACHMENT | wgpu::TextureUsage::SAMPLED,
+            label: Some("g-buffer depth texture"),
+        });
+
+        // I need one of these for each of the g-buffer elements I'm calculating
+        let mut g_buffer_data_texture_views = (0..4)
+            .map(|i| {
+                Arc::new(
+                    g_buffer_depth_texture.create_view(&wgpu::TextureViewDescriptor {
+                        label: Some("g-buffer depth texture"),
+                        format: None,
+                        dimension: Some(wgpu::TextureViewDimension::D2),
+                        aspect: wgpu::TextureAspect::All,
+                        base_mip_level: 0,
+                        level_count: None,
+                        base_array_layer: i as u32,
+                        array_layer_count: NonZeroU32::new(1),
+                    }),
+                )
+            })
+            .collect::<Vec<_>>();
+
         // Imgui renderer
         let renderer_config = ImguiRendererConfig {
             texture_format: sc_desc.format,
@@ -623,6 +966,15 @@ impl RenderState {
             ImguiRenderer::new(&mut imgui_context.context, &device, &queue, renderer_config);
 
         RenderState {
+            gbuffer_pass: g_buffer_pass,
+            gbuffer_cam_projection_buffer: g_buffer_camera_projection_uniform,
+            gbuffer_depth_texture: g_buffer_depth_texture
+                .create_view(&wgpu::TextureViewDescriptor::default()),
+            gbuffer_depth_views: g_buffer_depth_texture_views,
+            gbuffer_target_texture: g_buffer_data_texture
+                .create_view(&wgpu::TextureViewDescriptor::default()),
+            gbuffer_target_views: g_buffer_data_texture_views,
+
             swapchain: swap_chain,
             queue: queue,
             size,
@@ -630,7 +982,8 @@ impl RenderState {
             lights_are_dirty: true,
             shadow_pass,
             forward_pass,
-            forward_depth: depth_texture.create_view(&wgpu::TextureViewDescriptor::default()),
+            forward_depth: forward_depth_texture
+                .create_view(&wgpu::TextureViewDescriptor::default()),
             entity_bind_group_layout: entity_bind_group_layout,
             shadow_target_views: shadow_target_views,
             light_uniform_buf,
@@ -685,7 +1038,6 @@ impl RenderState {
     }
 }
 
-
 /*
 
 

src/render/system.rs

@@ -1,30 +1,30 @@
+use std::{iter, num::NonZeroU32, ops::Range, rc::Rc};
 use std::cell::RefCell;
 use std::iter::Chain;
 use std::slice::Iter;
 use std::sync::{Arc, Mutex};
 use std::thread::current;
 use std::time::Duration;
-use std::{iter, num::NonZeroU32, ops::Range, rc::Rc};
 
-use bytemuck::__core::mem;
 use bytemuck::{Pod, Zeroable};
+use bytemuck::__core::mem;
 use cgmath::{
-    vec3, Decomposed, Deg, Euler, InnerSpace, Matrix4, Point3, Quaternion, Rad, Rotation3,
-    Transform, Vector3,
+    Decomposed, Deg, Euler, InnerSpace, Matrix4, Point3, Quaternion, Rad, Rotation3, Transform,
+    vec3, Vector3,
 };
 use futures::executor::LocalPool;
-use imgui::sys::ImGuiContext;
 use imgui::*;
+use imgui::sys::ImGuiContext;
 use imgui_wgpu::{Renderer as ImguiRenderer, RendererConfig as ImguiRendererConfig};
-use legion::world::SubWorld;
 use legion::*;
+use legion::world::SubWorld;
 use rapier3d::parry::motion::RigidMotionComposition;
-use wgpu::util::DeviceExt;
 use wgpu::{
     BackendBit, BindGroup, BindGroupLayout, Buffer, BufferBindingType, CommandEncoder, Device,
     FragmentState, Instance, Queue, Surface, SwapChain, SwapChainDescriptor, SwapChainFrame,
     TextureView, VertexState,
 };
+use wgpu::util::DeviceExt;
 use winit_24::dpi::PhysicalSize;
 use winit_24::platform::unix::x11::ffi::Time;
 use winit_24::window::Window;
@@ -35,10 +35,8 @@ use crate::current_ui;
 use crate::geometry::{load_obj, Vertex};
 use crate::imgui_supp::imgui_support::{ImguiContext, ImguiPlatform};
 use crate::light::{DirectionalLight, LightRaw};
+use crate::render::{EntityUniforms, ForwardUniforms, insert_debug_marker_checked, pop_debug_group_checked, push_debug_group_checked};
 use crate::render::state::RenderState;
-use crate::render::{
-    insert_debug_marker_checked, pop_debug_group_checked, push_debug_group_checked, EntityUniforms,
-};
 
 #[system]
 #[write_component(Camera)]
@@ -81,6 +79,7 @@ fn run_imgui_render_step<G: 'static + Sized + Send + Sync>(world: &mut SubWorld,
             .build(&ui, || (window_func.unwrap())(ui, v));
     }
 }
+
 /// Go through each "global" window-data component and render it's data
 #[system]
 #[write_component(ImguiWindow < ImguiPerformanceProfilerLine >)]
@@ -235,6 +234,7 @@ pub fn render_test(
         mesh_stack.push(mesh.clone());
     }
 
+    // Update the light uniforms only if flagged
     if renderer.lights_are_dirty {
         renderer.lights_are_dirty = false;
         let mut query = <(&mut DirectionalLight, &mut Position)>::query();
@@ -247,10 +247,58 @@ pub fn render_test(
         }
     }
 
-    push_debug_group_checked("shadow passes", &mut encoder);
+    // Render the g buffer
+    push_debug_group_checked("g-buffer stuff", &mut encoder);
+    {
+        // insert_debug_marker_checked("render entities", &mut encoder);
 
-    let mut query = <(&mut DirectionalLight, &mut Position)>::query();
+        // The render pass for the g buffer.. Does it need any attachments
+        // the shadow pass uses a target view as the input, which are just views on
+        // top of the shadow texture. So the attachment is a RW buffer which clears on load
+        let mut pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+            label: Some("render pass"),
+            color_attachments: &[
+                wgpu::RenderPassColorAttachmentDescriptor {
+                    attachment: &renderer.gbuffer_target_views.get(0).unwrap(),
+                    resolve_target: None,
+                    ops: Default::default(),
+                },
+                wgpu::RenderPassColorAttachmentDescriptor {
+                    attachment: &renderer.gbuffer_target_views.get(1).unwrap(),
+                    resolve_target: None,
+                    ops: Default::default(),
+                },
+                wgpu::RenderPassColorAttachmentDescriptor {
+                    attachment: &renderer.gbuffer_target_views.get(2).unwrap(),
+                    resolve_target: None,
+                    ops: Default::default(),
+                }],
+            depth_stencil_attachment: Some(wgpu::RenderPassDepthStencilAttachmentDescriptor {
+                attachment: &renderer.gbuffer_target_views.get(3).unwrap(),
+                depth_ops: Some(wgpu::Operations {
+                    load: wgpu::LoadOp::Clear(1.0),
+                    store: true,
+                }),
+                stencil_ops: None,
+            }),
+        });
+
+        pass.set_pipeline(&renderer.gbuffer_pass.pipeline);
+        pass.set_bind_group(0, &renderer.gbuffer_pass.bind_group, &[]);
+
+        // for mesh in &mesh_stack {
+        //     pass.set_bind_group(1, &mesh.bind_group, &[]);
+        //     // TODO, pipe through this index format through the mesh
+        //     pass.set_index_buffer(mesh.index_buffer.slice(..), mesh.index_format);
+        //     pass.set_vertex_buffer(0, mesh.vertex_buffer.slice(..));
+        //     pass.draw_indexed(0..mesh.index_count as u32, 0, 0..1);
+        // }
+    }
+    pop_debug_group_checked(&mut encoder);
 
+    // Render the shadow textures
+    push_debug_group_checked("shadow passes", &mut encoder);
+    let mut query = <(&mut DirectionalLight, &mut Position)>::query();
     for (i, (light, pos)) in query.iter_mut(world).enumerate() {
         insert_debug_marker_checked(
             &format!("shadow pass {} (light at position {:?})", i, pos),
@@ -269,6 +317,7 @@ pub fn render_test(
 
         insert_debug_marker_checked("render entities", &mut encoder);
 
+        //
         let mut pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
             label: Some("render pass"),
             color_attachments: &[],
@@ -292,11 +341,10 @@ pub fn render_test(
             pass.draw_indexed(0..mesh.index_count as u32, 0, 0..1);
         }
     }
-
     pop_debug_group_checked(&mut encoder);
-    // forward pass
-    push_debug_group_checked("forward rendering pass", &mut encoder);
 
+    // And then render the viewport
+    push_debug_group_checked("forward rendering pass", &mut encoder);
     {
         let mut pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
             label: Some("forward render pass"),
@@ -327,6 +375,7 @@ pub fn render_test(
 
         let mut query = <(&mut Position, &mut Mesh)>::query();
 
+        // I could use that mesh stack here lol
         for (pos, mesh) in query.iter_mut(world) {
             pass.set_bind_group(1, &mesh.bind_group, &[]);
             // TODO: Pipe this in through the mesh
@@ -335,9 +384,12 @@ pub fn render_test(
             pass.draw_indexed(0..mesh.index_count as u32, 0, 0..1);
         }
     }
+
     pop_debug_group_checked(&mut encoder);
-    pop_debug_group_checked(&mut encoder);
 
+
+    // Run the Imgui render
+    push_debug_group_checked("imgui rendering pass", &mut encoder);
     {
         let mut imgui_context = &mut imgui_context.lock().unwrap().context;
         let mut imgui_platform = &mut imgui_platform.lock().unwrap().platform;
@@ -372,6 +424,10 @@ pub fn render_test(
             .render(draw_data, &renderer.queue, &renderer.device, &mut rpass)
             .expect("Rendering failed");
     }
+    pop_debug_group_checked(&mut encoder);
+
+    // the startfunction debug group
+    pop_debug_group_checked(&mut encoder);
 
     renderer.queue.submit(iter::once(encoder.finish()));
 }