diff options
Diffstat (limited to 'Client/ThirdParty/imgui/backends/imgui_impl_wgpu.cpp')
| -rw-r--r-- | Client/ThirdParty/imgui/backends/imgui_impl_wgpu.cpp | 717 |
1 files changed, 717 insertions, 0 deletions
diff --git a/Client/ThirdParty/imgui/backends/imgui_impl_wgpu.cpp b/Client/ThirdParty/imgui/backends/imgui_impl_wgpu.cpp new file mode 100644 index 0000000..2f621ed --- /dev/null +++ b/Client/ThirdParty/imgui/backends/imgui_impl_wgpu.cpp @@ -0,0 +1,717 @@ +// dear imgui: Renderer for WebGPU +// This needs to be used along with a Platform Binding (e.g. GLFW) +// (Please note that WebGPU is currently experimental, will not run on non-beta browsers, and may break.) + +// Implemented features: +// [X] Renderer: User texture binding. Use 'WGPUTextureView' as ImTextureID. Read the FAQ about ImTextureID! +// [X] Renderer: Support for large meshes (64k+ vertices) with 16-bit indices. + +// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. +// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need. +// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp. +// Read online: https://github.com/ocornut/imgui/tree/master/docs + +// CHANGELOG +// (minor and older changes stripped away, please see git history for details) +// 2021-08-24: Fix for latest specs. +// 2021-05-24: Add support for draw_data->FramebufferScale. +// 2021-05-19: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement) +// 2021-05-16: Update to latest WebGPU specs (compatible with Emscripten 2.0.20 and Chrome Canary 92). +// 2021-02-18: Change blending equation to preserve alpha in output buffer. +// 2021-01-28: Initial version. + +#include "imgui.h" +#include "imgui_impl_wgpu.h" +#include <limits.h> +#include <webgpu/webgpu.h> + +#define HAS_EMSCRIPTEN_VERSION(major, minor, tiny) (__EMSCRIPTEN_major__ > (major) || (__EMSCRIPTEN_major__ == (major) && __EMSCRIPTEN_minor__ > (minor)) || (__EMSCRIPTEN_major__ == (major) && __EMSCRIPTEN_minor__ == (minor) && __EMSCRIPTEN_tiny__ >= (tiny))) + +#if defined(__EMSCRIPTEN__) && !HAS_EMSCRIPTEN_VERSION(2, 0, 20) +#error "Requires at least emscripten 2.0.20" +#endif + +// Dear ImGui prototypes from imgui_internal.h +extern ImGuiID ImHashData(const void* data_p, size_t data_size, ImU32 seed = 0); + +// WebGPU data +static WGPUDevice g_wgpuDevice = NULL; +static WGPUQueue g_defaultQueue = NULL; +static WGPUTextureFormat g_renderTargetFormat = WGPUTextureFormat_Undefined; +static WGPURenderPipeline g_pipelineState = NULL; + +struct RenderResources +{ + WGPUTexture FontTexture; // Font texture + WGPUTextureView FontTextureView; // Texture view for font texture + WGPUSampler Sampler; // Sampler for the font texture + WGPUBuffer Uniforms; // Shader uniforms + WGPUBindGroup CommonBindGroup; // Resources bind-group to bind the common resources to pipeline + ImGuiStorage ImageBindGroups; // Resources bind-group to bind the font/image resources to pipeline (this is a key->value map) + WGPUBindGroup ImageBindGroup; // Default font-resource of Dear ImGui + WGPUBindGroupLayout ImageBindGroupLayout; // Cache layout used for the image bind group. Avoids allocating unnecessary JS objects when working with WebASM +}; +static RenderResources g_resources; + +struct FrameResources +{ + WGPUBuffer IndexBuffer; + WGPUBuffer VertexBuffer; + ImDrawIdx* IndexBufferHost; + ImDrawVert* VertexBufferHost; + int IndexBufferSize; + int VertexBufferSize; +}; +static FrameResources* g_pFrameResources = NULL; +static unsigned int g_numFramesInFlight = 0; +static unsigned int g_frameIndex = UINT_MAX; + +struct Uniforms +{ + float MVP[4][4]; +}; + +//----------------------------------------------------------------------------- +// SHADERS +//----------------------------------------------------------------------------- + +// glsl_shader.vert, compiled with: +// # glslangValidator -V -x -o glsl_shader.vert.u32 glsl_shader.vert +/* +#version 450 core +layout(location = 0) in vec2 aPos; +layout(location = 1) in vec2 aUV; +layout(location = 2) in vec4 aColor; +layout(set=0, binding = 0) uniform transform { mat4 mvp; }; + +out gl_PerVertex { vec4 gl_Position; }; +layout(location = 0) out struct { vec4 Color; vec2 UV; } Out; + +void main() +{ + Out.Color = aColor; + Out.UV = aUV; + gl_Position = mvp * vec4(aPos, 0, 1); +} +*/ +static uint32_t __glsl_shader_vert_spv[] = +{ + 0x07230203,0x00010000,0x00080007,0x0000002c,0x00000000,0x00020011,0x00000001,0x0006000b, + 0x00000001,0x4c534c47,0x6474732e,0x3035342e,0x00000000,0x0003000e,0x00000000,0x00000001, + 0x000a000f,0x00000000,0x00000004,0x6e69616d,0x00000000,0x0000000b,0x0000000f,0x00000015, + 0x0000001b,0x00000023,0x00030003,0x00000002,0x000001c2,0x00040005,0x00000004,0x6e69616d, + 0x00000000,0x00030005,0x00000009,0x00000000,0x00050006,0x00000009,0x00000000,0x6f6c6f43, + 0x00000072,0x00040006,0x00000009,0x00000001,0x00005655,0x00030005,0x0000000b,0x0074754f, + 0x00040005,0x0000000f,0x6c6f4361,0x0000726f,0x00030005,0x00000015,0x00565561,0x00060005, + 0x00000019,0x505f6c67,0x65567265,0x78657472,0x00000000,0x00060006,0x00000019,0x00000000, + 0x505f6c67,0x7469736f,0x006e6f69,0x00030005,0x0000001b,0x00000000,0x00050005,0x0000001d, + 0x6e617274,0x726f6673,0x0000006d,0x00040006,0x0000001d,0x00000000,0x0070766d,0x00030005, + 0x0000001f,0x00000000,0x00040005,0x00000023,0x736f5061,0x00000000,0x00040047,0x0000000b, + 0x0000001e,0x00000000,0x00040047,0x0000000f,0x0000001e,0x00000002,0x00040047,0x00000015, + 0x0000001e,0x00000001,0x00050048,0x00000019,0x00000000,0x0000000b,0x00000000,0x00030047, + 0x00000019,0x00000002,0x00040048,0x0000001d,0x00000000,0x00000005,0x00050048,0x0000001d, + 0x00000000,0x00000023,0x00000000,0x00050048,0x0000001d,0x00000000,0x00000007,0x00000010, + 0x00030047,0x0000001d,0x00000002,0x00040047,0x0000001f,0x00000022,0x00000000,0x00040047, + 0x0000001f,0x00000021,0x00000000,0x00040047,0x00000023,0x0000001e,0x00000000,0x00020013, + 0x00000002,0x00030021,0x00000003,0x00000002,0x00030016,0x00000006,0x00000020,0x00040017, + 0x00000007,0x00000006,0x00000004,0x00040017,0x00000008,0x00000006,0x00000002,0x0004001e, + 0x00000009,0x00000007,0x00000008,0x00040020,0x0000000a,0x00000003,0x00000009,0x0004003b, + 0x0000000a,0x0000000b,0x00000003,0x00040015,0x0000000c,0x00000020,0x00000001,0x0004002b, + 0x0000000c,0x0000000d,0x00000000,0x00040020,0x0000000e,0x00000001,0x00000007,0x0004003b, + 0x0000000e,0x0000000f,0x00000001,0x00040020,0x00000011,0x00000003,0x00000007,0x0004002b, + 0x0000000c,0x00000013,0x00000001,0x00040020,0x00000014,0x00000001,0x00000008,0x0004003b, + 0x00000014,0x00000015,0x00000001,0x00040020,0x00000017,0x00000003,0x00000008,0x0003001e, + 0x00000019,0x00000007,0x00040020,0x0000001a,0x00000003,0x00000019,0x0004003b,0x0000001a, + 0x0000001b,0x00000003,0x00040018,0x0000001c,0x00000007,0x00000004,0x0003001e,0x0000001d, + 0x0000001c,0x00040020,0x0000001e,0x00000002,0x0000001d,0x0004003b,0x0000001e,0x0000001f, + 0x00000002,0x00040020,0x00000020,0x00000002,0x0000001c,0x0004003b,0x00000014,0x00000023, + 0x00000001,0x0004002b,0x00000006,0x00000025,0x00000000,0x0004002b,0x00000006,0x00000026, + 0x3f800000,0x00050036,0x00000002,0x00000004,0x00000000,0x00000003,0x000200f8,0x00000005, + 0x0004003d,0x00000007,0x00000010,0x0000000f,0x00050041,0x00000011,0x00000012,0x0000000b, + 0x0000000d,0x0003003e,0x00000012,0x00000010,0x0004003d,0x00000008,0x00000016,0x00000015, + 0x00050041,0x00000017,0x00000018,0x0000000b,0x00000013,0x0003003e,0x00000018,0x00000016, + 0x00050041,0x00000020,0x00000021,0x0000001f,0x0000000d,0x0004003d,0x0000001c,0x00000022, + 0x00000021,0x0004003d,0x00000008,0x00000024,0x00000023,0x00050051,0x00000006,0x00000027, + 0x00000024,0x00000000,0x00050051,0x00000006,0x00000028,0x00000024,0x00000001,0x00070050, + 0x00000007,0x00000029,0x00000027,0x00000028,0x00000025,0x00000026,0x00050091,0x00000007, + 0x0000002a,0x00000022,0x00000029,0x00050041,0x00000011,0x0000002b,0x0000001b,0x0000000d, + 0x0003003e,0x0000002b,0x0000002a,0x000100fd,0x00010038 +}; + +// glsl_shader.frag, compiled with: +// # glslangValidator -V -x -o glsl_shader.frag.u32 glsl_shader.frag +/* +#version 450 core +layout(location = 0) out vec4 fColor; +layout(set=0, binding=1) uniform sampler s; +layout(set=1, binding=0) uniform texture2D t; +layout(location = 0) in struct { vec4 Color; vec2 UV; } In; +void main() +{ + fColor = In.Color * texture(sampler2D(t, s), In.UV.st); +} +*/ +static uint32_t __glsl_shader_frag_spv[] = +{ + 0x07230203,0x00010000,0x00080007,0x00000023,0x00000000,0x00020011,0x00000001,0x0006000b, + 0x00000001,0x4c534c47,0x6474732e,0x3035342e,0x00000000,0x0003000e,0x00000000,0x00000001, + 0x0007000f,0x00000004,0x00000004,0x6e69616d,0x00000000,0x00000009,0x0000000d,0x00030010, + 0x00000004,0x00000007,0x00030003,0x00000002,0x000001c2,0x00040005,0x00000004,0x6e69616d, + 0x00000000,0x00040005,0x00000009,0x6c6f4366,0x0000726f,0x00030005,0x0000000b,0x00000000, + 0x00050006,0x0000000b,0x00000000,0x6f6c6f43,0x00000072,0x00040006,0x0000000b,0x00000001, + 0x00005655,0x00030005,0x0000000d,0x00006e49,0x00030005,0x00000015,0x00000074,0x00030005, + 0x00000019,0x00000073,0x00040047,0x00000009,0x0000001e,0x00000000,0x00040047,0x0000000d, + 0x0000001e,0x00000000,0x00040047,0x00000015,0x00000022,0x00000001,0x00040047,0x00000015, + 0x00000021,0x00000000,0x00040047,0x00000019,0x00000022,0x00000000,0x00040047,0x00000019, + 0x00000021,0x00000001,0x00020013,0x00000002,0x00030021,0x00000003,0x00000002,0x00030016, + 0x00000006,0x00000020,0x00040017,0x00000007,0x00000006,0x00000004,0x00040020,0x00000008, + 0x00000003,0x00000007,0x0004003b,0x00000008,0x00000009,0x00000003,0x00040017,0x0000000a, + 0x00000006,0x00000002,0x0004001e,0x0000000b,0x00000007,0x0000000a,0x00040020,0x0000000c, + 0x00000001,0x0000000b,0x0004003b,0x0000000c,0x0000000d,0x00000001,0x00040015,0x0000000e, + 0x00000020,0x00000001,0x0004002b,0x0000000e,0x0000000f,0x00000000,0x00040020,0x00000010, + 0x00000001,0x00000007,0x00090019,0x00000013,0x00000006,0x00000001,0x00000000,0x00000000, + 0x00000000,0x00000001,0x00000000,0x00040020,0x00000014,0x00000000,0x00000013,0x0004003b, + 0x00000014,0x00000015,0x00000000,0x0002001a,0x00000017,0x00040020,0x00000018,0x00000000, + 0x00000017,0x0004003b,0x00000018,0x00000019,0x00000000,0x0003001b,0x0000001b,0x00000013, + 0x0004002b,0x0000000e,0x0000001d,0x00000001,0x00040020,0x0000001e,0x00000001,0x0000000a, + 0x00050036,0x00000002,0x00000004,0x00000000,0x00000003,0x000200f8,0x00000005,0x00050041, + 0x00000010,0x00000011,0x0000000d,0x0000000f,0x0004003d,0x00000007,0x00000012,0x00000011, + 0x0004003d,0x00000013,0x00000016,0x00000015,0x0004003d,0x00000017,0x0000001a,0x00000019, + 0x00050056,0x0000001b,0x0000001c,0x00000016,0x0000001a,0x00050041,0x0000001e,0x0000001f, + 0x0000000d,0x0000001d,0x0004003d,0x0000000a,0x00000020,0x0000001f,0x00050057,0x00000007, + 0x00000021,0x0000001c,0x00000020,0x00050085,0x00000007,0x00000022,0x00000012,0x00000021, + 0x0003003e,0x00000009,0x00000022,0x000100fd,0x00010038 +}; + +static void SafeRelease(ImDrawIdx*& res) +{ + if (res) + delete[] res; + res = NULL; +} +static void SafeRelease(ImDrawVert*& res) +{ + if (res) + delete[] res; + res = NULL; +} +static void SafeRelease(WGPUBindGroupLayout& res) +{ + if (res) + wgpuBindGroupLayoutRelease(res); + res = NULL; +} +static void SafeRelease(WGPUBindGroup& res) +{ + if (res) + wgpuBindGroupRelease(res); + res = NULL; +} +static void SafeRelease(WGPUBuffer& res) +{ + if (res) + wgpuBufferRelease(res); + res = NULL; +} +static void SafeRelease(WGPURenderPipeline& res) +{ + if (res) + wgpuRenderPipelineRelease(res); + res = NULL; +} +static void SafeRelease(WGPUSampler& res) +{ + if (res) + wgpuSamplerRelease(res); + res = NULL; +} +static void SafeRelease(WGPUShaderModule& res) +{ + if (res) + wgpuShaderModuleRelease(res); + res = NULL; +} +static void SafeRelease(WGPUTextureView& res) +{ + if (res) + wgpuTextureViewRelease(res); + res = NULL; +} +static void SafeRelease(WGPUTexture& res) +{ + if (res) + wgpuTextureRelease(res); + res = NULL; +} + +static void SafeRelease(RenderResources& res) +{ + SafeRelease(res.FontTexture); + SafeRelease(res.FontTextureView); + SafeRelease(res.Sampler); + SafeRelease(res.Uniforms); + SafeRelease(res.CommonBindGroup); + SafeRelease(res.ImageBindGroup); + SafeRelease(res.ImageBindGroupLayout); +}; + +static void SafeRelease(FrameResources& res) +{ + SafeRelease(res.IndexBuffer); + SafeRelease(res.VertexBuffer); + SafeRelease(res.IndexBufferHost); + SafeRelease(res.VertexBufferHost); +} + +static WGPUProgrammableStageDescriptor ImGui_ImplWGPU_CreateShaderModule(uint32_t* binary_data, uint32_t binary_data_size) +{ + WGPUShaderModuleSPIRVDescriptor spirv_desc = {}; + spirv_desc.chain.sType = WGPUSType_ShaderModuleSPIRVDescriptor; + spirv_desc.codeSize = binary_data_size; + spirv_desc.code = binary_data; + + WGPUShaderModuleDescriptor desc = {}; + desc.nextInChain = reinterpret_cast<WGPUChainedStruct*>(&spirv_desc); + + WGPUProgrammableStageDescriptor stage_desc = {}; + stage_desc.module = wgpuDeviceCreateShaderModule(g_wgpuDevice, &desc); + stage_desc.entryPoint = "main"; + return stage_desc; +} + +static WGPUBindGroup ImGui_ImplWGPU_CreateImageBindGroup(WGPUBindGroupLayout layout, WGPUTextureView texture) +{ + WGPUBindGroupEntry image_bg_entries[] = { { nullptr, 0, 0, 0, 0, 0, texture } }; + + WGPUBindGroupDescriptor image_bg_descriptor = {}; + image_bg_descriptor.layout = layout; + image_bg_descriptor.entryCount = sizeof(image_bg_entries) / sizeof(WGPUBindGroupEntry); + image_bg_descriptor.entries = image_bg_entries; + return wgpuDeviceCreateBindGroup(g_wgpuDevice, &image_bg_descriptor); +} + +static void ImGui_ImplWGPU_SetupRenderState(ImDrawData* draw_data, WGPURenderPassEncoder ctx, FrameResources* fr) +{ + // Setup orthographic projection matrix into our constant buffer + // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). + { + float L = draw_data->DisplayPos.x; + float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x; + float T = draw_data->DisplayPos.y; + float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y; + float mvp[4][4] = + { + { 2.0f/(R-L), 0.0f, 0.0f, 0.0f }, + { 0.0f, 2.0f/(T-B), 0.0f, 0.0f }, + { 0.0f, 0.0f, 0.5f, 0.0f }, + { (R+L)/(L-R), (T+B)/(B-T), 0.5f, 1.0f }, + }; + wgpuQueueWriteBuffer(g_defaultQueue, g_resources.Uniforms, 0, mvp, sizeof(mvp)); + } + + // Setup viewport + wgpuRenderPassEncoderSetViewport(ctx, 0, 0, draw_data->FramebufferScale.x * draw_data->DisplaySize.x, draw_data->FramebufferScale.y * draw_data->DisplaySize.y, 0, 1); + + // Bind shader and vertex buffers + wgpuRenderPassEncoderSetVertexBuffer(ctx, 0, fr->VertexBuffer, 0, 0); + wgpuRenderPassEncoderSetIndexBuffer(ctx, fr->IndexBuffer, sizeof(ImDrawIdx) == 2 ? WGPUIndexFormat_Uint16 : WGPUIndexFormat_Uint32, 0, 0); + wgpuRenderPassEncoderSetPipeline(ctx, g_pipelineState); + wgpuRenderPassEncoderSetBindGroup(ctx, 0, g_resources.CommonBindGroup, 0, NULL); + + // Setup blend factor + WGPUColor blend_color = { 0.f, 0.f, 0.f, 0.f }; + wgpuRenderPassEncoderSetBlendConstant(ctx, &blend_color); +} + +// Render function +// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop) +void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder pass_encoder) +{ + // Avoid rendering when minimized + if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f) + return; + + // FIXME: Assuming that this only gets called once per frame! + // If not, we can't just re-allocate the IB or VB, we'll have to do a proper allocator. + g_frameIndex = g_frameIndex + 1; + FrameResources* fr = &g_pFrameResources[g_frameIndex % g_numFramesInFlight]; + + // Create and grow vertex/index buffers if needed + if (fr->VertexBuffer == NULL || fr->VertexBufferSize < draw_data->TotalVtxCount) + { + if (fr->VertexBuffer) + { + wgpuBufferDestroy(fr->VertexBuffer); + wgpuBufferRelease(fr->VertexBuffer); + } + SafeRelease(fr->VertexBufferHost); + fr->VertexBufferSize = draw_data->TotalVtxCount + 5000; + + WGPUBufferDescriptor vb_desc = + { + NULL, + "Dear ImGui Vertex buffer", + WGPUBufferUsage_CopyDst | WGPUBufferUsage_Vertex, + fr->VertexBufferSize * sizeof(ImDrawVert), + false + }; + fr->VertexBuffer = wgpuDeviceCreateBuffer(g_wgpuDevice, &vb_desc); + if (!fr->VertexBuffer) + return; + + fr->VertexBufferHost = new ImDrawVert[fr->VertexBufferSize]; + } + if (fr->IndexBuffer == NULL || fr->IndexBufferSize < draw_data->TotalIdxCount) + { + if (fr->IndexBuffer) + { + wgpuBufferDestroy(fr->IndexBuffer); + wgpuBufferRelease(fr->IndexBuffer); + } + SafeRelease(fr->IndexBufferHost); + fr->IndexBufferSize = draw_data->TotalIdxCount + 10000; + + WGPUBufferDescriptor ib_desc = + { + NULL, + "Dear ImGui Index buffer", + WGPUBufferUsage_CopyDst | WGPUBufferUsage_Index, + fr->IndexBufferSize * sizeof(ImDrawIdx), + false + }; + fr->IndexBuffer = wgpuDeviceCreateBuffer(g_wgpuDevice, &ib_desc); + if (!fr->IndexBuffer) + return; + + fr->IndexBufferHost = new ImDrawIdx[fr->IndexBufferSize]; + } + + // Upload vertex/index data into a single contiguous GPU buffer + ImDrawVert* vtx_dst = (ImDrawVert*)fr->VertexBufferHost; + ImDrawIdx* idx_dst = (ImDrawIdx*)fr->IndexBufferHost; + for (int n = 0; n < draw_data->CmdListsCount; n++) + { + const ImDrawList* cmd_list = draw_data->CmdLists[n]; + memcpy(vtx_dst, cmd_list->VtxBuffer.Data, cmd_list->VtxBuffer.Size * sizeof(ImDrawVert)); + memcpy(idx_dst, cmd_list->IdxBuffer.Data, cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx)); + vtx_dst += cmd_list->VtxBuffer.Size; + idx_dst += cmd_list->IdxBuffer.Size; + } + int64_t vb_write_size = ((char*)vtx_dst - (char*)fr->VertexBufferHost + 3) & ~3; + int64_t ib_write_size = ((char*)idx_dst - (char*)fr->IndexBufferHost + 3) & ~3; + wgpuQueueWriteBuffer(g_defaultQueue, fr->VertexBuffer, 0, fr->VertexBufferHost, vb_write_size); + wgpuQueueWriteBuffer(g_defaultQueue, fr->IndexBuffer, 0, fr->IndexBufferHost, ib_write_size); + + // Setup desired render state + ImGui_ImplWGPU_SetupRenderState(draw_data, pass_encoder, fr); + + // Render command lists + // (Because we merged all buffers into a single one, we maintain our own offset into them) + int global_vtx_offset = 0; + int global_idx_offset = 0; + ImVec2 clip_scale = draw_data->FramebufferScale; + ImVec2 clip_off = draw_data->DisplayPos; + for (int n = 0; n < draw_data->CmdListsCount; n++) + { + const ImDrawList* cmd_list = draw_data->CmdLists[n]; + for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++) + { + const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i]; + if (pcmd->UserCallback != NULL) + { + // User callback, registered via ImDrawList::AddCallback() + // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.) + if (pcmd->UserCallback == ImDrawCallback_ResetRenderState) + ImGui_ImplWGPU_SetupRenderState(draw_data, pass_encoder, fr); + else + pcmd->UserCallback(cmd_list, pcmd); + } + else + { + // Bind custom texture + ImTextureID tex_id = pcmd->GetTexID(); + ImGuiID tex_id_hash = ImHashData(&tex_id, sizeof(tex_id)); + auto bind_group = g_resources.ImageBindGroups.GetVoidPtr(tex_id_hash); + if (bind_group) + { + wgpuRenderPassEncoderSetBindGroup(pass_encoder, 1, (WGPUBindGroup)bind_group, 0, NULL); + } + else + { + WGPUBindGroup image_bind_group = ImGui_ImplWGPU_CreateImageBindGroup(g_resources.ImageBindGroupLayout, (WGPUTextureView)tex_id); + g_resources.ImageBindGroups.SetVoidPtr(tex_id_hash, image_bind_group); + wgpuRenderPassEncoderSetBindGroup(pass_encoder, 1, image_bind_group, 0, NULL); + } + + // Project scissor/clipping rectangles into framebuffer space + ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y); + ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y); + if (clip_max.x < clip_min.x || clip_max.y < clip_min.y) + continue; + + // Apply scissor/clipping rectangle, Draw + wgpuRenderPassEncoderSetScissorRect(pass_encoder, (uint32_t)clip_min.x, (uint32_t)clip_min.y, (uint32_t)(clip_max.x - clip_min.x), (uint32_t)(clip_max.y - clip_min.y)); + wgpuRenderPassEncoderDrawIndexed(pass_encoder, pcmd->ElemCount, 1, pcmd->IdxOffset + global_idx_offset, pcmd->VtxOffset + global_vtx_offset, 0); + } + } + global_idx_offset += cmd_list->IdxBuffer.Size; + global_vtx_offset += cmd_list->VtxBuffer.Size; + } +} + +static void ImGui_ImplWGPU_CreateFontsTexture() +{ + // Build texture atlas + ImGuiIO& io = ImGui::GetIO(); + unsigned char* pixels; + int width, height, size_pp; + io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height, &size_pp); + + // Upload texture to graphics system + { + WGPUTextureDescriptor tex_desc = {}; + tex_desc.label = "Dear ImGui Font Texture"; + tex_desc.dimension = WGPUTextureDimension_2D; + tex_desc.size.width = width; + tex_desc.size.height = height; + tex_desc.size.depthOrArrayLayers = 1; + tex_desc.sampleCount = 1; + tex_desc.format = WGPUTextureFormat_RGBA8Unorm; + tex_desc.mipLevelCount = 1; + tex_desc.usage = WGPUTextureUsage_CopyDst | WGPUTextureUsage_TextureBinding; + g_resources.FontTexture = wgpuDeviceCreateTexture(g_wgpuDevice, &tex_desc); + + WGPUTextureViewDescriptor tex_view_desc = {}; + tex_view_desc.format = WGPUTextureFormat_RGBA8Unorm; + tex_view_desc.dimension = WGPUTextureViewDimension_2D; + tex_view_desc.baseMipLevel = 0; + tex_view_desc.mipLevelCount = 1; + tex_view_desc.baseArrayLayer = 0; + tex_view_desc.arrayLayerCount = 1; + tex_view_desc.aspect = WGPUTextureAspect_All; + g_resources.FontTextureView = wgpuTextureCreateView(g_resources.FontTexture, &tex_view_desc); + } + + // Upload texture data + { + WGPUImageCopyTexture dst_view = {}; + dst_view.texture = g_resources.FontTexture; + dst_view.mipLevel = 0; + dst_view.origin = { 0, 0, 0 }; + dst_view.aspect = WGPUTextureAspect_All; + WGPUTextureDataLayout layout = {}; + layout.offset = 0; + layout.bytesPerRow = width * size_pp; + layout.rowsPerImage = height; + WGPUExtent3D size = { (uint32_t)width, (uint32_t)height, 1 }; + wgpuQueueWriteTexture(g_defaultQueue, &dst_view, pixels, (uint32_t)(width * size_pp * height), &layout, &size); + } + + // Create the associated sampler + { + WGPUSamplerDescriptor sampler_desc = {}; + sampler_desc.minFilter = WGPUFilterMode_Linear; + sampler_desc.magFilter = WGPUFilterMode_Linear; + sampler_desc.mipmapFilter = WGPUFilterMode_Linear; + sampler_desc.addressModeU = WGPUAddressMode_Repeat; + sampler_desc.addressModeV = WGPUAddressMode_Repeat; + sampler_desc.addressModeW = WGPUAddressMode_Repeat; + sampler_desc.maxAnisotropy = 1; + g_resources.Sampler = wgpuDeviceCreateSampler(g_wgpuDevice, &sampler_desc); + } + + // Store our identifier + static_assert(sizeof(ImTextureID) >= sizeof(g_resources.FontTexture), "Can't pack descriptor handle into TexID, 32-bit not supported yet."); + io.Fonts->SetTexID((ImTextureID)g_resources.FontTextureView); +} + +static void ImGui_ImplWGPU_CreateUniformBuffer() +{ + WGPUBufferDescriptor ub_desc = + { + NULL, + "Dear ImGui Uniform buffer", + WGPUBufferUsage_CopyDst | WGPUBufferUsage_Uniform, + sizeof(Uniforms), + false + }; + g_resources.Uniforms = wgpuDeviceCreateBuffer(g_wgpuDevice, &ub_desc); +} + +bool ImGui_ImplWGPU_CreateDeviceObjects() +{ + if (!g_wgpuDevice) + return false; + if (g_pipelineState) + ImGui_ImplWGPU_InvalidateDeviceObjects(); + + // Create render pipeline + WGPURenderPipelineDescriptor graphics_pipeline_desc = {}; + graphics_pipeline_desc.primitive.topology = WGPUPrimitiveTopology_TriangleList; + graphics_pipeline_desc.primitive.stripIndexFormat = WGPUIndexFormat_Undefined; + graphics_pipeline_desc.primitive.frontFace = WGPUFrontFace_CW; + graphics_pipeline_desc.primitive.cullMode = WGPUCullMode_None; + graphics_pipeline_desc.multisample.count = 1; + graphics_pipeline_desc.multisample.mask = UINT_MAX; + graphics_pipeline_desc.multisample.alphaToCoverageEnabled = false; + graphics_pipeline_desc.layout = nullptr; // Use automatic layout generation + + // Create the vertex shader + WGPUProgrammableStageDescriptor vertex_shader_desc = ImGui_ImplWGPU_CreateShaderModule(__glsl_shader_vert_spv, sizeof(__glsl_shader_vert_spv) / sizeof(uint32_t)); + graphics_pipeline_desc.vertex.module = vertex_shader_desc.module; + graphics_pipeline_desc.vertex.entryPoint = vertex_shader_desc.entryPoint; + + // Vertex input configuration + WGPUVertexAttribute attribute_desc[] = + { + { WGPUVertexFormat_Float32x2, (uint64_t)IM_OFFSETOF(ImDrawVert, pos), 0 }, + { WGPUVertexFormat_Float32x2, (uint64_t)IM_OFFSETOF(ImDrawVert, uv), 1 }, + { WGPUVertexFormat_Unorm8x4, (uint64_t)IM_OFFSETOF(ImDrawVert, col), 2 }, + }; + + WGPUVertexBufferLayout buffer_layouts[1]; + buffer_layouts[0].arrayStride = sizeof(ImDrawVert); + buffer_layouts[0].stepMode = WGPUVertexStepMode_Vertex; + buffer_layouts[0].attributeCount = 3; + buffer_layouts[0].attributes = attribute_desc; + + graphics_pipeline_desc.vertex.bufferCount = 1; + graphics_pipeline_desc.vertex.buffers = buffer_layouts; + + // Create the pixel shader + WGPUProgrammableStageDescriptor pixel_shader_desc = ImGui_ImplWGPU_CreateShaderModule(__glsl_shader_frag_spv, sizeof(__glsl_shader_frag_spv) / sizeof(uint32_t)); + + // Create the blending setup + WGPUBlendState blend_state = {}; + blend_state.alpha.operation = WGPUBlendOperation_Add; + blend_state.alpha.srcFactor = WGPUBlendFactor_One; + blend_state.alpha.dstFactor = WGPUBlendFactor_OneMinusSrcAlpha; + blend_state.color.operation = WGPUBlendOperation_Add; + blend_state.color.srcFactor = WGPUBlendFactor_SrcAlpha; + blend_state.color.dstFactor = WGPUBlendFactor_OneMinusSrcAlpha; + + WGPUColorTargetState color_state = {}; + color_state.format = g_renderTargetFormat; + color_state.blend = &blend_state; + color_state.writeMask = WGPUColorWriteMask_All; + + WGPUFragmentState fragment_state = {}; + fragment_state.module = pixel_shader_desc.module; + fragment_state.entryPoint = pixel_shader_desc.entryPoint; + fragment_state.targetCount = 1; + fragment_state.targets = &color_state; + + graphics_pipeline_desc.fragment = &fragment_state; + + // Create depth-stencil State + WGPUDepthStencilState depth_stencil_state = {}; + depth_stencil_state.depthBias = 0; + depth_stencil_state.depthBiasClamp = 0; + depth_stencil_state.depthBiasSlopeScale = 0; + + // Configure disabled depth-stencil state + graphics_pipeline_desc.depthStencil = nullptr; + + g_pipelineState = wgpuDeviceCreateRenderPipeline(g_wgpuDevice, &graphics_pipeline_desc); + + ImGui_ImplWGPU_CreateFontsTexture(); + ImGui_ImplWGPU_CreateUniformBuffer(); + + // Create resource bind group + WGPUBindGroupLayout bg_layouts[2]; + bg_layouts[0] = wgpuRenderPipelineGetBindGroupLayout(g_pipelineState, 0); + bg_layouts[1] = wgpuRenderPipelineGetBindGroupLayout(g_pipelineState, 1); + + WGPUBindGroupEntry common_bg_entries[] = + { + { nullptr, 0, g_resources.Uniforms, 0, sizeof(Uniforms), 0, 0 }, + { nullptr, 1, 0, 0, 0, g_resources.Sampler, 0 }, + }; + + WGPUBindGroupDescriptor common_bg_descriptor = {}; + common_bg_descriptor.layout = bg_layouts[0]; + common_bg_descriptor.entryCount = sizeof(common_bg_entries) / sizeof(WGPUBindGroupEntry); + common_bg_descriptor.entries = common_bg_entries; + g_resources.CommonBindGroup = wgpuDeviceCreateBindGroup(g_wgpuDevice, &common_bg_descriptor); + + WGPUBindGroup image_bind_group = ImGui_ImplWGPU_CreateImageBindGroup(bg_layouts[1], g_resources.FontTextureView); + g_resources.ImageBindGroup = image_bind_group; + g_resources.ImageBindGroupLayout = bg_layouts[1]; + g_resources.ImageBindGroups.SetVoidPtr(ImHashData(&g_resources.FontTextureView, sizeof(ImTextureID)), image_bind_group); + + SafeRelease(vertex_shader_desc.module); + SafeRelease(pixel_shader_desc.module); + SafeRelease(bg_layouts[0]); + + return true; +} + +void ImGui_ImplWGPU_InvalidateDeviceObjects() +{ + if (!g_wgpuDevice) + return; + + SafeRelease(g_pipelineState); + SafeRelease(g_resources); + + ImGuiIO& io = ImGui::GetIO(); + io.Fonts->SetTexID(NULL); // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well. + + for (unsigned int i = 0; i < g_numFramesInFlight; i++) + SafeRelease(g_pFrameResources[i]); +} + +bool ImGui_ImplWGPU_Init(WGPUDevice device, int num_frames_in_flight, WGPUTextureFormat rt_format) +{ + // Setup backend capabilities flags + ImGuiIO& io = ImGui::GetIO(); + io.BackendRendererName = "imgui_impl_webgpu"; + io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset; // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes. + + g_wgpuDevice = device; + g_defaultQueue = wgpuDeviceGetQueue(g_wgpuDevice); + g_renderTargetFormat = rt_format; + g_pFrameResources = new FrameResources[num_frames_in_flight]; + g_numFramesInFlight = num_frames_in_flight; + g_frameIndex = UINT_MAX; + + g_resources.FontTexture = NULL; + g_resources.FontTextureView = NULL; + g_resources.Sampler = NULL; + g_resources.Uniforms = NULL; + g_resources.CommonBindGroup = NULL; + g_resources.ImageBindGroups.Data.reserve(100); + g_resources.ImageBindGroup = NULL; + g_resources.ImageBindGroupLayout = NULL; + + // Create buffers with a default size (they will later be grown as needed) + for (int i = 0; i < num_frames_in_flight; i++) + { + FrameResources* fr = &g_pFrameResources[i]; + fr->IndexBuffer = NULL; + fr->VertexBuffer = NULL; + fr->IndexBufferHost = NULL; + fr->VertexBufferHost = NULL; + fr->IndexBufferSize = 10000; + fr->VertexBufferSize = 5000; + } + + return true; +} + +void ImGui_ImplWGPU_Shutdown() +{ + ImGui_ImplWGPU_InvalidateDeviceObjects(); + delete[] g_pFrameResources; + g_pFrameResources = NULL; + wgpuQueueRelease(g_defaultQueue); + g_wgpuDevice = NULL; + g_numFramesInFlight = 0; + g_frameIndex = UINT_MAX; +} + +void ImGui_ImplWGPU_NewFrame() +{ + if (!g_pipelineState) + ImGui_ImplWGPU_CreateDeviceObjects(); +} |