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-rw-r--r--src/3d/renderer.cc383
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diff --git a/src/3d/renderer.cc b/src/3d/renderer.cc
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+// This file is part of the 64k demo project.
+// It implements the Renderer3D class.
+
+#include "3d/renderer.h"
+#include <iostream>
+#include <cstring>
+
+// Simple Cube Geometry (Triangle list)
+// 36 vertices
+static const float kCubeVertices[] = {
+ // Front face
+ -1.0, -1.0, 1.0,
+ 1.0, -1.0, 1.0,
+ 1.0, 1.0, 1.0,
+ -1.0, -1.0, 1.0,
+ 1.0, 1.0, 1.0,
+ -1.0, 1.0, 1.0,
+ // Back face
+ -1.0, -1.0, -1.0,
+ -1.0, 1.0, -1.0,
+ 1.0, 1.0, -1.0,
+ -1.0, -1.0, -1.0,
+ 1.0, 1.0, -1.0,
+ 1.0, -1.0, -1.0,
+ // Top face
+ -1.0, 1.0, -1.0,
+ -1.0, 1.0, 1.0,
+ 1.0, 1.0, 1.0,
+ -1.0, 1.0, -1.0,
+ 1.0, 1.0, 1.0,
+ 1.0, 1.0, -1.0,
+ // Bottom face
+ -1.0, -1.0, -1.0,
+ 1.0, -1.0, -1.0,
+ 1.0, -1.0, 1.0,
+ -1.0, -1.0, -1.0,
+ 1.0, -1.0, 1.0,
+ -1.0, -1.0, 1.0,
+ // Right face
+ 1.0, -1.0, -1.0,
+ 1.0, 1.0, -1.0,
+ 1.0, 1.0, 1.0,
+ 1.0, -1.0, -1.0,
+ 1.0, 1.0, 1.0,
+ 1.0, -1.0, 1.0,
+ // Left face
+ -1.0, -1.0, -1.0,
+ -1.0, -1.0, 1.0,
+ -1.0, 1.0, 1.0,
+ -1.0, -1.0, -1.0,
+ -1.0, 1.0, 1.0,
+ -1.0, 1.0, -1.0,
+};
+
+static const char* kShaderCode = R"(
+struct GlobalUniforms {
+ view_proj: mat4x4<f32>,
+ camera_pos: vec3<f32>,
+ time: f32,
+};
+
+struct ObjectData {
+ model: mat4x4<f32>,
+ color: vec4<f32>,
+ params: vec4<f32>,
+};
+
+struct ObjectsBuffer {
+ objects: array<ObjectData>,
+};
+
+@group(0) @binding(0) var<uniform> globals: GlobalUniforms;
+@group(0) @binding(1) var<storage, read> object_data: ObjectsBuffer;
+
+struct VertexOutput {
+ @builtin(position) position: vec4<f32>,
+ @location(0) local_pos: vec3<f32>,
+ @location(1) color: vec4<f32>,
+};
+
+@vertex
+fn vs_main(@builtin(vertex_index) vertex_index: u32,
+ @builtin(instance_index) instance_index: u32) -> VertexOutput {
+
+ // Hardcoded cube vertices (similar to C++ array but in shader for simplicity if desired,
+ // but here we might assume a vertex buffer or just generate logic.
+ // For this demo, let's use the buffer-less approach for vertices if we want to save space,
+ // but we have a C++ array. Let's just generate a cube on the fly from index?)
+ // Actually, let's map the C++ kCubeVertices to a vertex buffer or use a hardcoded array here.
+ // For 64k size, hardcoded in shader is good.
+
+ var pos = array<vec3<f32>, 36>(
+ vec3(-1.0, -1.0, 1.0), vec3( 1.0, -1.0, 1.0), vec3( 1.0, 1.0, 1.0),
+ vec3(-1.0, -1.0, 1.0), vec3( 1.0, 1.0, 1.0), vec3(-1.0, 1.0, 1.0),
+ vec3(-1.0, -1.0, -1.0), vec3(-1.0, 1.0, -1.0), vec3( 1.0, 1.0, -1.0),
+ vec3(-1.0, -1.0, -1.0), vec3( 1.0, 1.0, -1.0), vec3( 1.0, -1.0, -1.0),
+ vec3(-1.0, 1.0, -1.0), vec3(-1.0, 1.0, 1.0), vec3( 1.0, 1.0, 1.0),
+ vec3(-1.0, 1.0, -1.0), vec3( 1.0, 1.0, 1.0), vec3( 1.0, 1.0, -1.0),
+ vec3(-1.0, -1.0, -1.0), vec3( 1.0, -1.0, -1.0), vec3( 1.0, -1.0, 1.0),
+ vec3(-1.0, -1.0, -1.0), vec3( 1.0, -1.0, 1.0), vec3(-1.0, -1.0, 1.0),
+ vec3( 1.0, -1.0, -1.0), vec3( 1.0, 1.0, -1.0), vec3( 1.0, 1.0, 1.0),
+ vec3( 1.0, -1.0, -1.0), vec3( 1.0, 1.0, 1.0), vec3( 1.0, -1.0, 1.0),
+ vec3(-1.0, -1.0, -1.0), vec3(-1.0, -1.0, 1.0), vec3(-1.0, 1.0, 1.0),
+ vec3(-1.0, -1.0, -1.0), vec3(-1.0, 1.0, 1.0), vec3(-1.0, 1.0, -1.0)
+ );
+
+ let p = pos[vertex_index];
+ let obj = object_data.objects[instance_index];
+
+ // Model -> World -> Clip
+ let world_pos = obj.model * vec4<f32>(p, 1.0);
+ let clip_pos = globals.view_proj * world_pos;
+
+ var out: VertexOutput;
+ out.position = clip_pos;
+ out.local_pos = p;
+ out.color = obj.color;
+ return out;
+}
+
+@fragment
+fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
+ // Simple wireframe-ish effect using barycentric coords logic?
+ // Or just check proximity to edge of local cube?
+ let d = abs(in.local_pos);
+ let edge_dist = max(max(d.x, d.y), d.z);
+
+ // Mix object color with edge highlight
+ var col = in.color.rgb;
+ if (edge_dist > 0.95) {
+ col = vec3<f32>(1.0, 1.0, 1.0); // White edges
+ } else {
+ // Simple shading
+ let normal = normalize(cross(dpdx(in.local_pos), dpdy(in.local_pos)));
+ let light = normalize(vec3<f32>(0.5, 1.0, 0.5));
+ let diff = max(dot(normal, light), 0.2);
+ col = col * diff;
+ }
+
+ return vec4<f32>(col, 1.0);
+}
+)";
+
+void Renderer3D::init(WGPUDevice device, WGPUQueue queue, WGPUTextureFormat format) {
+ device_ = device;
+ queue_ = queue;
+ format_ = format;
+
+ create_default_resources();
+ create_pipeline();
+}
+
+void Renderer3D::shutdown() {
+ if (pipeline_) wgpuRenderPipelineRelease(pipeline_);
+ if (bind_group_) wgpuBindGroupRelease(bind_group_);
+ if (global_uniform_buffer_) wgpuBufferRelease(global_uniform_buffer_);
+ if (object_storage_buffer_) wgpuBufferRelease(object_storage_buffer_);
+ if (depth_view_) wgpuTextureViewRelease(depth_view_);
+ if (depth_texture_) wgpuTextureRelease(depth_texture_);
+}
+
+void Renderer3D::resize(int width, int height) {
+ if (width == width_ && height == height_) return;
+
+ width_ = width;
+ height_ = height;
+
+ if (depth_view_) wgpuTextureViewRelease(depth_view_);
+ if (depth_texture_) wgpuTextureRelease(depth_texture_);
+
+ WGPUTextureDescriptor desc = {};
+ desc.usage = WGPUTextureUsage_RenderAttachment;
+ desc.dimension = WGPUTextureDimension_2D;
+ desc.size = {(uint32_t)width, (uint32_t)height, 1};
+ desc.format = WGPUTextureFormat_Depth24Plus; // Common depth format
+ desc.mipLevelCount = 1;
+ desc.sampleCount = 1;
+
+ depth_texture_ = wgpuDeviceCreateTexture(device_, &desc);
+
+ WGPUTextureViewDescriptor view_desc = {};
+ view_desc.format = WGPUTextureFormat_Depth24Plus;
+ view_desc.dimension = WGPUTextureViewDimension_2D;
+ view_desc.aspect = WGPUTextureAspect_DepthOnly;
+ view_desc.arrayLayerCount = 1;
+ view_desc.mipLevelCount = 1;
+
+ depth_view_ = wgpuTextureCreateView(depth_texture_, &view_desc);
+}
+
+void Renderer3D::create_default_resources() {
+ // Uniform Buffer
+ global_uniform_buffer_ = gpu_create_buffer(device_, sizeof(GlobalUniforms),
+ WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst, nullptr).buffer;
+
+ // Storage Buffer
+ size_t storage_size = sizeof(ObjectData) * kMaxObjects;
+ object_storage_buffer_ = gpu_create_buffer(device_, storage_size,
+ WGPUBufferUsage_Storage | WGPUBufferUsage_CopyDst, nullptr).buffer;
+}
+
+void Renderer3D::create_pipeline() {
+ // Bind Group Layout
+ WGPUBindGroupLayoutEntry entries[2] = {};
+
+ // Binding 0: Globals (Uniform)
+ entries[0].binding = 0;
+ entries[0].visibility = WGPUShaderStage_Vertex | WGPUShaderStage_Fragment;
+ entries[0].buffer.type = WGPUBufferBindingType_Uniform;
+ entries[0].buffer.minBindingSize = sizeof(GlobalUniforms);
+
+ // Binding 1: Object Data (Storage)
+ entries[1].binding = 1;
+ entries[1].visibility = WGPUShaderStage_Vertex | WGPUShaderStage_Fragment;
+ entries[1].buffer.type = WGPUBufferBindingType_ReadOnlyStorage;
+ entries[1].buffer.minBindingSize = sizeof(ObjectData) * kMaxObjects;
+
+ WGPUBindGroupLayoutDescriptor bgl_desc = {};
+ bgl_desc.entryCount = 2;
+ bgl_desc.entries = entries;
+ WGPUBindGroupLayout bgl = wgpuDeviceCreateBindGroupLayout(device_, &bgl_desc);
+
+ // Bind Group
+ WGPUBindGroupEntry bg_entries[2] = {};
+ bg_entries[0].binding = 0;
+ bg_entries[0].buffer = global_uniform_buffer_;
+ bg_entries[0].size = sizeof(GlobalUniforms);
+
+ bg_entries[1].binding = 1;
+ bg_entries[1].buffer = object_storage_buffer_;
+ bg_entries[1].size = sizeof(ObjectData) * kMaxObjects;
+
+ WGPUBindGroupDescriptor bg_desc = {};
+ bg_desc.layout = bgl;
+ bg_desc.entryCount = 2;
+ bg_desc.entries = bg_entries;
+ bind_group_ = wgpuDeviceCreateBindGroup(device_, &bg_desc);
+
+ // Pipeline Layout
+ WGPUPipelineLayoutDescriptor pl_desc = {};
+ pl_desc.bindGroupLayoutCount = 1;
+ pl_desc.bindGroupLayouts = &bgl;
+ WGPUPipelineLayout pipeline_layout = wgpuDeviceCreatePipelineLayout(device_, &pl_desc);
+
+ // Shader Code
+ const char* shader_source = kShaderCode;
+
+ // Shader Module
+#if defined(DEMO_CROSS_COMPILE_WIN32)
+ WGPUShaderModuleWGSLDescriptor wgsl_desc = {};
+ wgsl_desc.chain.sType = WGPUSType_ShaderModuleWGSLDescriptor;
+ wgsl_desc.code = shader_source;
+
+ WGPUShaderModuleDescriptor shader_desc = {};
+ shader_desc.nextInChain = (const WGPUChainedStruct*)&wgsl_desc.chain;
+#else
+ WGPUShaderSourceWGSL wgsl_desc = {};
+ wgsl_desc.chain.sType = WGPUSType_ShaderSourceWGSL;
+ wgsl_desc.code = {shader_source, strlen(shader_source)};
+
+ WGPUShaderModuleDescriptor shader_desc = {};
+ shader_desc.nextInChain = (const WGPUChainedStruct*)&wgsl_desc.chain;
+#endif
+
+ WGPUShaderModule shader_module = wgpuDeviceCreateShaderModule(device_, &shader_desc);
+
+ // Depth Stencil State
+ WGPUDepthStencilState depth_stencil = {};
+ depth_stencil.format = WGPUTextureFormat_Depth24Plus;
+ depth_stencil.depthWriteEnabled = WGPUOptionalBool_True;
+ depth_stencil.depthCompare = WGPUCompareFunction_Less;
+
+ // Render Pipeline
+ WGPURenderPipelineDescriptor desc = {};
+ desc.layout = pipeline_layout;
+
+ // Vertex
+ desc.vertex.module = shader_module;
+#if defined(DEMO_CROSS_COMPILE_WIN32)
+ desc.vertex.entryPoint = "vs_main";
+#else
+ desc.vertex.entryPoint = {"vs_main", 7};
+#endif
+
+ // Fragment
+ WGPUColorTargetState color_target = {};
+ color_target.format = format_;
+ color_target.writeMask = WGPUColorWriteMask_All;
+
+ WGPUFragmentState fragment = {};
+ fragment.module = shader_module;
+#if defined(DEMO_CROSS_COMPILE_WIN32)
+ fragment.entryPoint = "fs_main";
+#else
+ fragment.entryPoint = {"fs_main", 7};
+#endif
+ fragment.targetCount = 1;
+ fragment.targets = &color_target;
+ desc.fragment = &fragment;
+
+ desc.primitive.topology = WGPUPrimitiveTopology_TriangleList;
+ desc.primitive.cullMode = WGPUCullMode_Back;
+ desc.primitive.frontFace = WGPUFrontFace_CCW;
+
+ desc.depthStencil = &depth_stencil;
+ desc.multisample.count = 1;
+ desc.multisample.mask = 0xFFFFFFFF;
+
+ pipeline_ = wgpuDeviceCreateRenderPipeline(device_, &desc);
+
+ wgpuBindGroupLayoutRelease(bgl);
+ wgpuPipelineLayoutRelease(pipeline_layout);
+ wgpuShaderModuleRelease(shader_module);
+}
+
+void Renderer3D::update_uniforms(const Scene& scene, const Camera& camera, float time) {
+ // Update Globals
+ GlobalUniforms globals;
+ globals.view_proj = camera.get_projection_matrix() * camera.get_view_matrix();
+ globals.camera_pos = camera.position;
+ globals.time = time;
+ wgpuQueueWriteBuffer(queue_, global_uniform_buffer_, 0, &globals, sizeof(GlobalUniforms));
+
+ // Update Objects
+ std::vector<ObjectData> obj_data;
+ obj_data.reserve(scene.objects.size());
+ for (const auto& obj : scene.objects) {
+ ObjectData data;
+ data.model = obj.get_model_matrix();
+ data.color = obj.color;
+ // data.params = ...
+ obj_data.push_back(data);
+ if (obj_data.size() >= kMaxObjects) break;
+ }
+
+ if (!obj_data.empty()) {
+ wgpuQueueWriteBuffer(queue_, object_storage_buffer_, 0, obj_data.data(), obj_data.size() * sizeof(ObjectData));
+ }
+}
+
+void Renderer3D::render(const Scene& scene, const Camera& camera, float time,
+ WGPUTextureView target_view, WGPUTextureView depth_view_opt) {
+ update_uniforms(scene, camera, time);
+
+ WGPUTextureView depth_view = depth_view_opt ? depth_view_opt : depth_view_;
+ if (!depth_view) return; // Should have been created by resize
+
+ WGPURenderPassColorAttachment color_attachment = {};
+ gpu_init_color_attachment(color_attachment, target_view);
+ color_attachment.clearValue = {0.05, 0.05, 0.1, 1.0}; // Dark blue-ish background
+
+ WGPURenderPassDepthStencilAttachment depth_attachment = {};
+ depth_attachment.view = depth_view;
+ depth_attachment.depthLoadOp = WGPULoadOp_Clear;
+ depth_attachment.depthStoreOp = WGPUStoreOp_Store;
+ depth_attachment.depthClearValue = 1.0f;
+
+ WGPURenderPassDescriptor pass_desc = {};
+ pass_desc.colorAttachmentCount = 1;
+ pass_desc.colorAttachments = &color_attachment;
+ pass_desc.depthStencilAttachment = &depth_attachment;
+
+ WGPUCommandEncoder encoder = wgpuDeviceCreateCommandEncoder(device_, nullptr);
+ WGPURenderPassEncoder pass = wgpuCommandEncoderBeginRenderPass(encoder, &pass_desc);
+
+ wgpuRenderPassEncoderSetPipeline(pass, pipeline_);
+ wgpuRenderPassEncoderSetBindGroup(pass, 0, bind_group_, 0, nullptr);
+
+ // Draw all objects (Instance Count = object count)
+ // Vertex Count = 36 (Cube)
+ uint32_t instance_count = (uint32_t)std::min((size_t)kMaxObjects, scene.objects.size());
+ if (instance_count > 0) {
+ wgpuRenderPassEncoderDraw(pass, 36, instance_count, 0, 0);
+ }
+
+ wgpuRenderPassEncoderEnd(pass);
+ WGPUCommandBuffer commands = wgpuCommandEncoderFinish(encoder, nullptr);
+ wgpuQueueSubmit(queue_, 1, &commands);
+
+ wgpuRenderPassEncoderRelease(pass);
+ wgpuCommandBufferRelease(commands);
+ wgpuCommandEncoderRelease(encoder);
+}
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