[WIP] Emscripten support

compile-shaders-emscripten.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# compile shaders
+
+# simple shader
+./third-party/build/bin/shaderc \
+-f shader/v_simple.sc -o shader/v_simple.bin  \
+--platform asmjs --type vertex --verbose -i ./
+
+./third-party/build/bin/shaderc \
+-f shader/f_simple.sc -o shader/f_simple.bin \
+--platform asmjs --type fragment --verbose -i ./

configure-make.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+# Commands to configure this repo for building after dependencies have been installed
+
+cmake -S . -B build/debug -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Debug \
+-DCMAKE_PREFIX_PATH="$(pwd)/third-party/build" \
+-DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+
+cmake -S . -B build/release -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release \
+-DCMAKE_PREFIX_PATH="$(pwd)/third-party/build" \
+-DCMAKE_EXPORT_COMPILE_COMMANDS=ON

file-ops.h

@@ -3,6 +3,11 @@
 #include <fstream>
 #include <iostream>
 
+#include "bgfx/platform.h"
+#if BX_PLATFORM_EMSCRIPTEN
+#include <emscripten.h>
+#endif
+
 // stream string operations derived from:
 // Optimized C++ by Kurt Guntheroth (O’Reilly).
 // Copyright 2016 Kurt Guntheroth, 978-1-491-92206-4
@@ -37,6 +42,7 @@ inline bool stream_read_string(std::istream& file, std::string& fileContents)
 
 inline bool read_file(const std::string& filename, std::string& fileContents)
 {
+#if !BX_PLATFORM_EMSCRIPTEN
     std::ifstream file(filename, std::ios::binary);
 
     if (!file.is_open()) {
@@ -48,6 +54,18 @@ inline bool read_file(const std::string& filename, std::string& fileContents)
     file.close();
 
     return success;
+#else
+    emscripten_fetch_attr_t attr;
+    emscripten_fetch_attr_init(&attr);
+    strcpy(attr.requestMethod, "GET");
+    attr.attributes = EMSCRIPTEN_FETCH_ATTR_LOAD_TO_MEMORY | EMSCRIPTEN_FETCH_SYNCHRONOUS;
+    emscripten_fetch_t *fetch = emscripten_fetch(&attr, filename.c_str());
+    if (fetch->status == 200) {
+        *fileContents = fetch->data;
+        return true;
+    } else
+        return false;
+#endif
 }
 
 } // namespace fileops

main.cpp

@@ -74,6 +74,8 @@ int main(int argc, char** argv)
 #elif BX_PLATFORM_LINUX
     pd.ndt = wmi.info.x11.display;
     pd.nwh = (void*)(uintptr_t)wmi.info.x11.window;
+#elif BX_PLATFORM_EMSCRIPTEN
+    pd.nwh = (void*)"#canvas";
 #endif // BX_PLATFORM_WINDOWS ? BX_PLATFORM_OSX ? BX_PLATFORM_LINUX
 
     bgfx::Init bgfx_init;
@@ -96,7 +98,7 @@ int main(int argc, char** argv)
     ImGui_ImplSDL2_InitForD3D(window);
 #elif BX_PLATFORM_OSX
     ImGui_ImplSDL2_InitForMetal(window);
-#elif BX_PLATFORM_LINUX
+#elif BX_PLATFORM_LINUX || BX_PLATFORM_EMSCRIPTEN
     ImGui_ImplSDL2_InitForOpenGL(window, nullptr);
 #endif // BX_PLATFORM_WINDOWS ? BX_PLATFORM_OSX ? BX_PLATFORM_LINUX