mirror of
https://github.com/ocornut/imgui.git
synced 2024-11-14 11:07:48 +01:00
719 lines
31 KiB
C++
719 lines
31 KiB
C++
// dear imgui: Renderer for WebGPU
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// This needs to be used along with a Platform Binding (e.g. GLFW)
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// (Please note that WebGPU is currently experimental, will not run on non-beta browsers, and may break.)
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// Implemented features:
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// [X] Renderer: User texture binding. Use 'WGPUTextureView' as ImTextureID. Read the FAQ about ImTextureID!
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// [X] Renderer: Support for large meshes (64k+ vertices) with 16-bit indices.
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// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
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// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
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// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
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// Read online: https://github.com/ocornut/imgui/tree/master/docs
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// CHANGELOG
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// (minor and older changes stripped away, please see git history for details)
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// 2021-11-29: Passing explicit buffer sizes to wgpuRenderPassEncoderSetVertexBuffer()/wgpuRenderPassEncoderSetIndexBuffer().
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// 2021-08-24: Fix for latest specs.
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// 2021-05-24: Add support for draw_data->FramebufferScale.
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// 2021-05-19: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
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// 2021-05-16: Update to latest WebGPU specs (compatible with Emscripten 2.0.20 and Chrome Canary 92).
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// 2021-02-18: Change blending equation to preserve alpha in output buffer.
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// 2021-01-28: Initial version.
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#include "imgui.h"
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#include "imgui_impl_wgpu.h"
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#include <limits.h>
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#include <webgpu/webgpu.h>
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#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)))
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#if defined(__EMSCRIPTEN__) && !HAS_EMSCRIPTEN_VERSION(2, 0, 20)
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#error "Requires at least emscripten 2.0.20"
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#endif
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// Dear ImGui prototypes from imgui_internal.h
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extern ImGuiID ImHashData(const void* data_p, size_t data_size, ImU32 seed = 0);
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// WebGPU data
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static WGPUDevice g_wgpuDevice = NULL;
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static WGPUQueue g_defaultQueue = NULL;
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static WGPUTextureFormat g_renderTargetFormat = WGPUTextureFormat_Undefined;
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static WGPURenderPipeline g_pipelineState = NULL;
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struct RenderResources
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{
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WGPUTexture FontTexture; // Font texture
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WGPUTextureView FontTextureView; // Texture view for font texture
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WGPUSampler Sampler; // Sampler for the font texture
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WGPUBuffer Uniforms; // Shader uniforms
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WGPUBindGroup CommonBindGroup; // Resources bind-group to bind the common resources to pipeline
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ImGuiStorage ImageBindGroups; // Resources bind-group to bind the font/image resources to pipeline (this is a key->value map)
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WGPUBindGroup ImageBindGroup; // Default font-resource of Dear ImGui
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WGPUBindGroupLayout ImageBindGroupLayout; // Cache layout used for the image bind group. Avoids allocating unnecessary JS objects when working with WebASM
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};
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static RenderResources g_resources;
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struct FrameResources
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{
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WGPUBuffer IndexBuffer;
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WGPUBuffer VertexBuffer;
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ImDrawIdx* IndexBufferHost;
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ImDrawVert* VertexBufferHost;
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int IndexBufferSize;
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int VertexBufferSize;
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};
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static FrameResources* g_pFrameResources = NULL;
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static unsigned int g_numFramesInFlight = 0;
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static unsigned int g_frameIndex = UINT_MAX;
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struct Uniforms
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{
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float MVP[4][4];
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};
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//-----------------------------------------------------------------------------
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// SHADERS
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//-----------------------------------------------------------------------------
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// glsl_shader.vert, compiled with:
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// # glslangValidator -V -x -o glsl_shader.vert.u32 glsl_shader.vert
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/*
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#version 450 core
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layout(location = 0) in vec2 aPos;
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layout(location = 1) in vec2 aUV;
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layout(location = 2) in vec4 aColor;
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layout(set=0, binding = 0) uniform transform { mat4 mvp; };
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out gl_PerVertex { vec4 gl_Position; };
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layout(location = 0) out struct { vec4 Color; vec2 UV; } Out;
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void main()
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{
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Out.Color = aColor;
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Out.UV = aUV;
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gl_Position = mvp * vec4(aPos, 0, 1);
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}
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*/
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static uint32_t __glsl_shader_vert_spv[] =
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{
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0x07230203,0x00010000,0x00080007,0x0000002c,0x00000000,0x00020011,0x00000001,0x0006000b,
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0x00000001,0x4c534c47,0x6474732e,0x3035342e,0x00000000,0x0003000e,0x00000000,0x00000001,
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0x000a000f,0x00000000,0x00000004,0x6e69616d,0x00000000,0x0000000b,0x0000000f,0x00000015,
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0x0000001b,0x00000023,0x00030003,0x00000002,0x000001c2,0x00040005,0x00000004,0x6e69616d,
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0x00000000,0x00030005,0x00000009,0x00000000,0x00050006,0x00000009,0x00000000,0x6f6c6f43,
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0x00000072,0x00040006,0x00000009,0x00000001,0x00005655,0x00030005,0x0000000b,0x0074754f,
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0x00040005,0x0000000f,0x6c6f4361,0x0000726f,0x00030005,0x00000015,0x00565561,0x00060005,
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0x00000019,0x505f6c67,0x65567265,0x78657472,0x00000000,0x00060006,0x00000019,0x00000000,
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0x505f6c67,0x7469736f,0x006e6f69,0x00030005,0x0000001b,0x00000000,0x00050005,0x0000001d,
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0x6e617274,0x726f6673,0x0000006d,0x00040006,0x0000001d,0x00000000,0x0070766d,0x00030005,
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0x0000001f,0x00000000,0x00040005,0x00000023,0x736f5061,0x00000000,0x00040047,0x0000000b,
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0x0000001e,0x00000000,0x00040047,0x0000000f,0x0000001e,0x00000002,0x00040047,0x00000015,
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0x0000001e,0x00000001,0x00050048,0x00000019,0x00000000,0x0000000b,0x00000000,0x00030047,
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0x00000019,0x00000002,0x00040048,0x0000001d,0x00000000,0x00000005,0x00050048,0x0000001d,
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0x00000000,0x00000023,0x00000000,0x00050048,0x0000001d,0x00000000,0x00000007,0x00000010,
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0x00030047,0x0000001d,0x00000002,0x00040047,0x0000001f,0x00000022,0x00000000,0x00040047,
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0x0000001f,0x00000021,0x00000000,0x00040047,0x00000023,0x0000001e,0x00000000,0x00020013,
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0x00000002,0x00030021,0x00000003,0x00000002,0x00030016,0x00000006,0x00000020,0x00040017,
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0x00000007,0x00000006,0x00000004,0x00040017,0x00000008,0x00000006,0x00000002,0x0004001e,
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0x00000009,0x00000007,0x00000008,0x00040020,0x0000000a,0x00000003,0x00000009,0x0004003b,
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0x0000000a,0x0000000b,0x00000003,0x00040015,0x0000000c,0x00000020,0x00000001,0x0004002b,
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0x0000000c,0x0000000d,0x00000000,0x00040020,0x0000000e,0x00000001,0x00000007,0x0004003b,
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0x0000000e,0x0000000f,0x00000001,0x00040020,0x00000011,0x00000003,0x00000007,0x0004002b,
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0x0000000c,0x00000013,0x00000001,0x00040020,0x00000014,0x00000001,0x00000008,0x0004003b,
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0x00000014,0x00000015,0x00000001,0x00040020,0x00000017,0x00000003,0x00000008,0x0003001e,
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0x00000019,0x00000007,0x00040020,0x0000001a,0x00000003,0x00000019,0x0004003b,0x0000001a,
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0x0000001b,0x00000003,0x00040018,0x0000001c,0x00000007,0x00000004,0x0003001e,0x0000001d,
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0x0000001c,0x00040020,0x0000001e,0x00000002,0x0000001d,0x0004003b,0x0000001e,0x0000001f,
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0x00000002,0x00040020,0x00000020,0x00000002,0x0000001c,0x0004003b,0x00000014,0x00000023,
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0x00000001,0x0004002b,0x00000006,0x00000025,0x00000000,0x0004002b,0x00000006,0x00000026,
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0x3f800000,0x00050036,0x00000002,0x00000004,0x00000000,0x00000003,0x000200f8,0x00000005,
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0x0004003d,0x00000007,0x00000010,0x0000000f,0x00050041,0x00000011,0x00000012,0x0000000b,
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0x0000000d,0x0003003e,0x00000012,0x00000010,0x0004003d,0x00000008,0x00000016,0x00000015,
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0x00050041,0x00000017,0x00000018,0x0000000b,0x00000013,0x0003003e,0x00000018,0x00000016,
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0x00050041,0x00000020,0x00000021,0x0000001f,0x0000000d,0x0004003d,0x0000001c,0x00000022,
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0x00000021,0x0004003d,0x00000008,0x00000024,0x00000023,0x00050051,0x00000006,0x00000027,
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0x00000024,0x00000000,0x00050051,0x00000006,0x00000028,0x00000024,0x00000001,0x00070050,
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0x00000007,0x00000029,0x00000027,0x00000028,0x00000025,0x00000026,0x00050091,0x00000007,
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0x0000002a,0x00000022,0x00000029,0x00050041,0x00000011,0x0000002b,0x0000001b,0x0000000d,
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0x0003003e,0x0000002b,0x0000002a,0x000100fd,0x00010038
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};
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// glsl_shader.frag, compiled with:
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// # glslangValidator -V -x -o glsl_shader.frag.u32 glsl_shader.frag
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/*
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#version 450 core
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layout(location = 0) out vec4 fColor;
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layout(set=0, binding=1) uniform sampler s;
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layout(set=1, binding=0) uniform texture2D t;
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layout(location = 0) in struct { vec4 Color; vec2 UV; } In;
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void main()
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{
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fColor = In.Color * texture(sampler2D(t, s), In.UV.st);
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}
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*/
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static uint32_t __glsl_shader_frag_spv[] =
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{
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0x07230203,0x00010000,0x00080007,0x00000023,0x00000000,0x00020011,0x00000001,0x0006000b,
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0x00000001,0x4c534c47,0x6474732e,0x3035342e,0x00000000,0x0003000e,0x00000000,0x00000001,
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0x0007000f,0x00000004,0x00000004,0x6e69616d,0x00000000,0x00000009,0x0000000d,0x00030010,
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0x00000004,0x00000007,0x00030003,0x00000002,0x000001c2,0x00040005,0x00000004,0x6e69616d,
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0x00000000,0x00040005,0x00000009,0x6c6f4366,0x0000726f,0x00030005,0x0000000b,0x00000000,
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0x00050006,0x0000000b,0x00000000,0x6f6c6f43,0x00000072,0x00040006,0x0000000b,0x00000001,
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0x00005655,0x00030005,0x0000000d,0x00006e49,0x00030005,0x00000015,0x00000074,0x00030005,
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0x00000019,0x00000073,0x00040047,0x00000009,0x0000001e,0x00000000,0x00040047,0x0000000d,
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0x0000001e,0x00000000,0x00040047,0x00000015,0x00000022,0x00000001,0x00040047,0x00000015,
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0x00000021,0x00000000,0x00040047,0x00000019,0x00000022,0x00000000,0x00040047,0x00000019,
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0x00000021,0x00000001,0x00020013,0x00000002,0x00030021,0x00000003,0x00000002,0x00030016,
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0x00000006,0x00000020,0x00040017,0x00000007,0x00000006,0x00000004,0x00040020,0x00000008,
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0x00000003,0x00000007,0x0004003b,0x00000008,0x00000009,0x00000003,0x00040017,0x0000000a,
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|
0x00000006,0x00000002,0x0004001e,0x0000000b,0x00000007,0x0000000a,0x00040020,0x0000000c,
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|
0x00000001,0x0000000b,0x0004003b,0x0000000c,0x0000000d,0x00000001,0x00040015,0x0000000e,
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|
0x00000020,0x00000001,0x0004002b,0x0000000e,0x0000000f,0x00000000,0x00040020,0x00000010,
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0x00000001,0x00000007,0x00090019,0x00000013,0x00000006,0x00000001,0x00000000,0x00000000,
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0x00000000,0x00000001,0x00000000,0x00040020,0x00000014,0x00000000,0x00000013,0x0004003b,
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0x00000014,0x00000015,0x00000000,0x0002001a,0x00000017,0x00040020,0x00000018,0x00000000,
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|
0x00000017,0x0004003b,0x00000018,0x00000019,0x00000000,0x0003001b,0x0000001b,0x00000013,
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|
0x0004002b,0x0000000e,0x0000001d,0x00000001,0x00040020,0x0000001e,0x00000001,0x0000000a,
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0x00050036,0x00000002,0x00000004,0x00000000,0x00000003,0x000200f8,0x00000005,0x00050041,
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0x00000010,0x00000011,0x0000000d,0x0000000f,0x0004003d,0x00000007,0x00000012,0x00000011,
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0x0004003d,0x00000013,0x00000016,0x00000015,0x0004003d,0x00000017,0x0000001a,0x00000019,
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0x00050056,0x0000001b,0x0000001c,0x00000016,0x0000001a,0x00050041,0x0000001e,0x0000001f,
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0x0000000d,0x0000001d,0x0004003d,0x0000000a,0x00000020,0x0000001f,0x00050057,0x00000007,
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0x00000021,0x0000001c,0x00000020,0x00050085,0x00000007,0x00000022,0x00000012,0x00000021,
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0x0003003e,0x00000009,0x00000022,0x000100fd,0x00010038
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};
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static void SafeRelease(ImDrawIdx*& res)
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{
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if (res)
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delete[] res;
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res = NULL;
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}
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static void SafeRelease(ImDrawVert*& res)
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{
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if (res)
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delete[] res;
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res = NULL;
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}
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static void SafeRelease(WGPUBindGroupLayout& res)
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{
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if (res)
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wgpuBindGroupLayoutRelease(res);
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res = NULL;
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}
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static void SafeRelease(WGPUBindGroup& res)
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{
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if (res)
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wgpuBindGroupRelease(res);
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res = NULL;
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}
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static void SafeRelease(WGPUBuffer& res)
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{
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if (res)
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wgpuBufferRelease(res);
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res = NULL;
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}
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static void SafeRelease(WGPURenderPipeline& res)
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{
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if (res)
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wgpuRenderPipelineRelease(res);
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res = NULL;
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}
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static void SafeRelease(WGPUSampler& res)
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{
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if (res)
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wgpuSamplerRelease(res);
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res = NULL;
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}
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static void SafeRelease(WGPUShaderModule& res)
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{
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if (res)
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wgpuShaderModuleRelease(res);
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res = NULL;
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}
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static void SafeRelease(WGPUTextureView& res)
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{
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if (res)
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wgpuTextureViewRelease(res);
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res = NULL;
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}
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static void SafeRelease(WGPUTexture& res)
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{
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if (res)
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wgpuTextureRelease(res);
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res = NULL;
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}
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static void SafeRelease(RenderResources& res)
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{
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SafeRelease(res.FontTexture);
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SafeRelease(res.FontTextureView);
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SafeRelease(res.Sampler);
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SafeRelease(res.Uniforms);
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SafeRelease(res.CommonBindGroup);
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SafeRelease(res.ImageBindGroup);
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SafeRelease(res.ImageBindGroupLayout);
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};
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static void SafeRelease(FrameResources& res)
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{
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SafeRelease(res.IndexBuffer);
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SafeRelease(res.VertexBuffer);
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SafeRelease(res.IndexBufferHost);
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SafeRelease(res.VertexBufferHost);
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}
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static WGPUProgrammableStageDescriptor ImGui_ImplWGPU_CreateShaderModule(uint32_t* binary_data, uint32_t binary_data_size)
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{
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WGPUShaderModuleSPIRVDescriptor spirv_desc = {};
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spirv_desc.chain.sType = WGPUSType_ShaderModuleSPIRVDescriptor;
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spirv_desc.codeSize = binary_data_size;
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spirv_desc.code = binary_data;
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WGPUShaderModuleDescriptor desc = {};
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desc.nextInChain = reinterpret_cast<WGPUChainedStruct*>(&spirv_desc);
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WGPUProgrammableStageDescriptor stage_desc = {};
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stage_desc.module = wgpuDeviceCreateShaderModule(g_wgpuDevice, &desc);
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stage_desc.entryPoint = "main";
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return stage_desc;
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}
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static WGPUBindGroup ImGui_ImplWGPU_CreateImageBindGroup(WGPUBindGroupLayout layout, WGPUTextureView texture)
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{
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WGPUBindGroupEntry image_bg_entries[] = { { nullptr, 0, 0, 0, 0, 0, texture } };
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WGPUBindGroupDescriptor image_bg_descriptor = {};
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image_bg_descriptor.layout = layout;
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image_bg_descriptor.entryCount = sizeof(image_bg_entries) / sizeof(WGPUBindGroupEntry);
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image_bg_descriptor.entries = image_bg_entries;
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return wgpuDeviceCreateBindGroup(g_wgpuDevice, &image_bg_descriptor);
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}
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static void ImGui_ImplWGPU_SetupRenderState(ImDrawData* draw_data, WGPURenderPassEncoder ctx, FrameResources* fr)
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{
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// Setup orthographic projection matrix into our constant buffer
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// Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right).
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{
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float L = draw_data->DisplayPos.x;
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float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x;
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float T = draw_data->DisplayPos.y;
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float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y;
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float mvp[4][4] =
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{
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{ 2.0f/(R-L), 0.0f, 0.0f, 0.0f },
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{ 0.0f, 2.0f/(T-B), 0.0f, 0.0f },
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{ 0.0f, 0.0f, 0.5f, 0.0f },
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{ (R+L)/(L-R), (T+B)/(B-T), 0.5f, 1.0f },
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};
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wgpuQueueWriteBuffer(g_defaultQueue, g_resources.Uniforms, 0, mvp, sizeof(mvp));
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}
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// Setup viewport
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wgpuRenderPassEncoderSetViewport(ctx, 0, 0, draw_data->FramebufferScale.x * draw_data->DisplaySize.x, draw_data->FramebufferScale.y * draw_data->DisplaySize.y, 0, 1);
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// Bind shader and vertex buffers
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wgpuRenderPassEncoderSetVertexBuffer(ctx, 0, fr->VertexBuffer, 0, fr->VertexBufferSize * sizeof(ImDrawVert));
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wgpuRenderPassEncoderSetIndexBuffer(ctx, fr->IndexBuffer, sizeof(ImDrawIdx) == 2 ? WGPUIndexFormat_Uint16 : WGPUIndexFormat_Uint32, 0, fr->IndexBufferSize * sizeof(ImDrawIdx));
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wgpuRenderPassEncoderSetPipeline(ctx, g_pipelineState);
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wgpuRenderPassEncoderSetBindGroup(ctx, 0, g_resources.CommonBindGroup, 0, NULL);
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// Setup blend factor
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WGPUColor blend_color = { 0.f, 0.f, 0.f, 0.f };
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wgpuRenderPassEncoderSetBlendConstant(ctx, &blend_color);
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}
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|
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// Render function
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// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
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void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder pass_encoder)
|
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{
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// 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();
|
|
}
|