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Backends: SDLGPU3: Added sdl_gpu backend. (#8163, #7998, #7988)

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+Squashed: Optimized shader source code encoding by ocornut (#8163, #7998, #7988)
(squashed to avoid storing both in git history, 130 KB->62 KB)
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Delta 2025-01-09 15:37:13 +01:00 • committed by ocornut
parent 940d9540f3
commit 8bbccf7a97
12 changed files with 1676 additions and 0 deletions
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73
examples/example_sdl3_sdlgpu3/Makefile Normal file
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#
# Cross Platform Makefile
# Compatible with MSYS2/MINGW, Ubuntu 14.04.1 and Mac OS X
#
# You will need SDL3 (http://www.libsdl.org) which is still unreleased/unpackaged.
#CXX = g++
#CXX = clang++
EXE = example_sdl3_sdlgpu3
IMGUI_DIR = ../..
SOURCES = main.cpp
SOURCES += $(IMGUI_DIR)/imgui.cpp $(IMGUI_DIR)/imgui_demo.cpp $(IMGUI_DIR)/imgui_draw.cpp $(IMGUI_DIR)/imgui_tables.cpp $(IMGUI_DIR)/imgui_widgets.cpp
SOURCES += $(IMGUI_DIR)/backends/imgui_impl_sdl3.cpp $(IMGUI_DIR)/backends/imgui_impl_sdlgpu3.cpp
OBJS = $(addsuffix .o, $(basename $(notdir $(SOURCES))))
UNAME_S := $(shell uname -s)
CXXFLAGS = -std=c++11 -I$(IMGUI_DIR) -I$(IMGUI_DIR)/backends
CXXFLAGS += -g -Wall -Wformat
LIBS =
##---------------------------------------------------------------------
## BUILD FLAGS PER PLATFORM
##---------------------------------------------------------------------
ifeq ($(UNAME_S), Linux) #LINUX
ECHO_MESSAGE = "Linux"
LIBS += -ldl `pkg-config sdl3 --libs`
CXXFLAGS += `pkg-config sdl3 --cflags`
CFLAGS = $(CXXFLAGS)
endif
ifeq ($(UNAME_S), Darwin) #APPLE
ECHO_MESSAGE = "Mac OS X"
LIBS += -framework Cocoa -framework IOKit -framework CoreVideo `pkg-config --libs sdl3`
LIBS += -L/usr/local/lib -L/opt/local/lib
CXXFLAGS += `pkg-config sdl3 --cflags`
CXXFLAGS += -I/usr/local/include -I/opt/local/include
CFLAGS = $(CXXFLAGS)
endif
ifeq ($(OS), Windows_NT)
ECHO_MESSAGE = "MinGW"
LIBS += -lgdi32 -limm32 `pkg-config --static --libs sdl3`
CXXFLAGS += `pkg-config --cflags sdl3`
CFLAGS = $(CXXFLAGS)
endif
##---------------------------------------------------------------------
## BUILD RULES
##---------------------------------------------------------------------
%.o:%.cpp
$(CXX) $(CXXFLAGS) -c -o $@ $<
%.o:$(IMGUI_DIR)/%.cpp
$(CXX) $(CXXFLAGS) -c -o $@ $<
%.o:$(IMGUI_DIR)/backends/%.cpp
$(CXX) $(CXXFLAGS) -c -o $@ $<
all: $(EXE)
@echo Build complete for $(ECHO_MESSAGE)
$(EXE): $(OBJS)
$(CXX) -o $@ $^ $(CXXFLAGS) $(LIBS)
clean:
rm -f $(EXE) $(OBJS)

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examples/example_sdl3_sdlgpu3/build_win64.bat Normal file
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@REM Build for Visual Studio compiler. Run your copy of vcvars64.bat or vcvarsall.bat to setup command-line compiler.
@set OUT_EXE=example_sdl3_sdlgpu3
@set INCLUDES=/I..\.. /I..\..\backends /I%SDL3_DIR%\include
@set SOURCES=main.cpp ..\..\backends\imgui_impl_sdl3.cpp ..\..\backends\imgui_impl_sdlgpu3.cpp ..\..\imgui*.cpp
@set LIBS=/LIBPATH:%SDL3_DIR%\lib\x64 SDL3.lib shell32.lib
@set OUT_DIR=Debug
mkdir %OUT_DIR%
cl /nologo /Zi /MD /utf-8 %INCLUDES% %SOURCES% /Fe%OUT_DIR%/%OUT_EXE%.exe /Fo%OUT_DIR%/ /link %LIBS% /subsystem:console
@set OUT_DIR=Release
@REM mkdir %OUT_DIR%
@REM cl /nologo /Zi /MD /utf-8 /Ox /Oi %INCLUDES% %SOURCES% /Fe%OUT_DIR%/%OUT_EXE%.exe /Fo%OUT_DIR%/ /link %LIBS% /subsystem:console

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examples/example_sdl3_sdlgpu3/example_sdl3_sdlgpu3.vcxproj Normal file
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<Platform>Win32</Platform>
</ProjectConfiguration>
<ProjectConfiguration Include="Release|x64">
<Configuration>Release</Configuration>
<Platform>x64</Platform>
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<ProjectGuid>{c22cb6f8-39a5-4dda-90ed-4aca4e81e1e5}</ProjectGuid>
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<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<ClCompile>
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<PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<AdditionalOptions>/utf-8 %(AdditionalOptions)</AdditionalOptions>
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<Link>
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<AdditionalLibraryDirectories>%SDL3_DIR%\lib\x86;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
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60
examples/example_sdl3_sdlgpu3/example_sdl3_sdlgpu3.vcxproj.filters Normal file
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examples/example_sdl3_sdlgpu3/main.cpp Normal file
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// Dear ImGui: standalone example application for SDL_Gpu
// Learn about Dear ImGui:
// - FAQ https://dearimgui.com/faq
// - Getting Started https://dearimgui.com/getting-started
// - Documentation https://dearimgui.com/docs (same as your local docs/ folder).
// - Introduction, links and more at the top of imgui.cpp
// Important note to the reader who wish to integrate imgui_impl_sdlgpu3.cpp/.h in their own engine/app.
// - Unline other backends, the user must call the function Imgui_ImplSDLGPU_PrepareDrawData BEFORE issuing a SDL_GPURenderPass containing ImGui_ImplSDLGPU_RenderDrawData.
// Calling the function is MANDATORY, otherwise the ImGui will not upload neither the vertex nor the index buffer for the GPU. See imgui_impl_sdlgpu3.cpp for more info.
#include "imgui.h"
#include "imgui_impl_sdl3.h"
#include "imgui_impl_sdlgpu3.h"
#include <stdio.h> // printf, fprintf
#include <stdlib.h> // abort
#include <SDL3/SDL.h>
// This example doesn't compile with Emscripten yet! Awaiting SDL3 support.
#ifdef __EMSCRIPTEN__
#include "../libs/emscripten/emscripten_mainloop_stub.h"
#endif
// Main code
int main(int, char**)
{
// Setup SDL
if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMEPAD) != 0)
{
printf("Error: SDL_Init(): %s\n", SDL_GetError());
return -1;
}
// Create SDL window graphics context
SDL_Window* window = SDL_CreateWindow("Dear ImGui SDLGpu example", 1280, 720, SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIGH_PIXEL_DENSITY);
if (window == nullptr)
{
printf("Error: SDL_CreateWindow(): %s\n", SDL_GetError());
return -1;
}
// Create SDL Gpu Device
SDL_GPUDevice* gpuDevice = SDL_CreateGPUDevice(SDL_GPU_SHADERFORMAT_SPIRV | SDL_GPU_SHADERFORMAT_DXIL | SDL_GPU_SHADERFORMAT_METALLIB,true,nullptr);
if (gpuDevice == nullptr)
{
printf("Error: SDL_CreateGPUDevice(): %s\n", SDL_GetError());
return -1;
}
// Claim window for GPU Device
if (!SDL_ClaimWindowForGPUDevice(gpuDevice, window))
{
printf("Error: SDL_ClaimWindowForGPUDevice(): %s\n", SDL_GetError());
return -1;
}
// Setup Dear ImGui context
IMGUI_CHECKVERSION();
ImGui::CreateContext();
ImGuiIO& io = ImGui::GetIO(); (void)io;
io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
// Setup Dear ImGui style
ImGui::StyleColorsDark();
//ImGui::StyleColorsLight();
// Setup Platform/Renderer backends
ImGui_ImplSDL3_InitForOther(window);
ImGui_ImplSDLGPU_InitInfo init_info = {};
init_info.GpuDevice = gpuDevice;
init_info.ColorTargetFormat = SDL_GetGPUSwapchainTextureFormat(gpuDevice, window);
init_info.MSAASamples = SDL_GPU_SAMPLECOUNT_1;
ImGui_ImplSDLGPU_Init(&init_info);
// Load Fonts
// - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
// - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
// - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
// - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
// - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
// - Read 'docs/FONTS.md' for more instructions and details.
// - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
//io.Fonts->AddFontDefault();
//io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\segoeui.ttf", 18.0f);
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
//ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
//IM_ASSERT(font != nullptr);
// Our state
bool show_demo_window = true;
bool show_another_window = false;
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
// Main loop
bool done = false;
while (!done)
{
// Poll and handle events (inputs, window resize, etc.)
// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
SDL_Event event;
while (SDL_PollEvent(&event))
{
ImGui_ImplSDL3_ProcessEvent(&event);
if (event.type == SDL_EVENT_QUIT)
done = true;
if (event.type == SDL_EVENT_WINDOW_CLOSE_REQUESTED && event.window.windowID == SDL_GetWindowID(window))
done = true;
}
if (SDL_GetWindowFlags(window) & SDL_WINDOW_MINIMIZED)
{
SDL_Delay(10);
continue;
}
// Start the Dear ImGui frame
ImGui_ImplSDLGPU_NewFrame();
ImGui_ImplSDL3_NewFrame();
ImGui::NewFrame();
// 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
if (show_demo_window)
ImGui::ShowDemoWindow(&show_demo_window);
// 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
{
static float f = 0.0f;
static int counter = 0;
ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.
ImGui::Text("This is some useful text."); // Display some text (you can use a format strings too)
ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
ImGui::Checkbox("Another Window", &show_another_window);
ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
if (ImGui::Button("Button")) // Buttons return true when clicked (most widgets return true when edited/activated)
counter++;
ImGui::SameLine();
ImGui::Text("counter = %d", counter);
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
ImGui::End();
}
// 3. Show another simple window.
if (show_another_window)
{
ImGui::Begin("Another Window", &show_another_window); // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
ImGui::Text("Hello from another window!");
if (ImGui::Button("Close Me"))
show_another_window = false;
ImGui::End();
}
// Rendering
ImGui::Render();
ImDrawData* draw_data = ImGui::GetDrawData();
const bool is_minimized = (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f);
// Acquire a GPU command buffer
SDL_GPUCommandBuffer* command_buffer = SDL_AcquireGPUCommandBuffer(gpuDevice);
//Acquire a swapchain texture
SDL_GPUTexture* swapchain_texture;
SDL_AcquireGPUSwapchainTexture(command_buffer, window, &swapchain_texture, nullptr, nullptr);
if (swapchain_texture != nullptr && !is_minimized)
{
// !!! THIS IS MANDATORY !!!
// Call Imgui_ImplSDLGPU_PrepareDrawData to upload the vertex/index buffer
Imgui_ImplSDLGPU_PrepareDrawData(draw_data, command_buffer);
// Setup and start a render pass
SDL_GPUColorTargetInfo target_info = {};
target_info.texture = swapchain_texture;
target_info.clear_color = SDL_FColor{ clear_color.x,clear_color.y,clear_color.z,clear_color.w };
target_info.load_op = SDL_GPU_LOADOP_CLEAR;
target_info.store_op = SDL_GPU_STOREOP_STORE;
target_info.mip_level = 0;
target_info.layer_or_depth_plane = 0;
target_info.cycle = false;
SDL_GPURenderPass* render_pass = SDL_BeginGPURenderPass(command_buffer, &target_info, 1, nullptr);
/// Render ImGui
ImGui_ImplSDLGPU_RenderDrawData(draw_data, command_buffer, render_pass);
SDL_EndGPURenderPass(render_pass);
}
// Submit the command buffer
SDL_SubmitGPUCommandBuffer(command_buffer);
}
// Cleanup
SDL_WaitForGPUIdle(gpuDevice);
ImGui_ImplSDL3_Shutdown();
ImGui_ImplSDLGPU_Shutdown();
ImGui::DestroyContext();
SDL_ReleaseWindowFromGPUDevice(gpuDevice, window);
SDL_DestroyGPUDevice(gpuDevice);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}