From 404c23e63dc1803ba5398887a0e1e3877dac56a2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Tue, 22 Aug 2017 22:41:08 +0200
Subject: [PATCH] Platform: ported magnum-info to Emscripten.

---
 CMakeLists.txt                                |  5 ++--
 doc/changelog.dox                             |  1 +
 package/archlinux/PKGBUILD-emscripten         |  2 ++
 package/archlinux/PKGBUILD-emscripten-noopt   |  2 ++
 .../PKGBUILD-emscripten-noopt-webgl2          |  2 ++
 package/archlinux/PKGBUILD-emscripten-wasm    |  2 ++
 .../archlinux/PKGBUILD-emscripten-wasm-webgl2 |  2 ++
 package/archlinux/PKGBUILD-emscripten-webgl2  |  2 ++
 package/ci/travis-emscripten.sh               |  1 +
 src/Magnum/Platform/CMakeLists.txt            | 18 ++++++++++--
 src/Magnum/Platform/magnum-info.cpp           | 28 +++++++++++++------
 src/Magnum/Platform/magnum-info.html          | 19 +++++++++++++
 12 files changed, 72 insertions(+), 12 deletions(-)
 create mode 100644 src/Magnum/Platform/magnum-info.html

diff --git a/CMakeLists.txt b/CMakeLists.txt
index adaa35c29..817c50944 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -63,8 +63,9 @@ cmake_dependent_option(TARGET_GLES2 "Build for OpenGL ES 2 / WebGL 1.0" ON "TARG
 cmake_dependent_option(TARGET_DESKTOP_GLES "Build for OpenGL ES on desktop" OFF "TARGET_GLES" OFF)
 option(TARGET_HEADLESS "Build command-line utilities for use on a headless machines" OFF)
 
-# Magnum Info (currently only using GLX, CGL or WGL/EGL on Windows)
-if(CORRADE_TARGET_UNIX OR CORRADE_TARGET_WINDOWS)
+# Magnum Info (currently only using GLX/CGL/EGL on *nix, WGL/EGL on Windows and
+# EGL on Emscripten)
+if(CORRADE_TARGET_UNIX OR CORRADE_TARGET_WINDOWS OR CORRADE_TARGET_EMSCRIPTEN)
     option(WITH_MAGNUMINFO "Build magnum-info utility" OFF)
 endif()
 
diff --git a/doc/changelog.dox b/doc/changelog.dox
index c7b8e56da..9d3180459 100644
--- a/doc/changelog.dox
+++ b/doc/changelog.dox
@@ -226,6 +226,7 @@ namespace Magnum {
 -   New @ref Platform::WindowlessGlxContext "Platform::Windowless*Context"
     classes that manage OpenGL context to make threaded context creation
     possible
+-   Ported @ref magnum-info "magnum-info" to Emscripten
 -   First-class support for scroll events in
     @ref Platform::Sdl2Application::MouseScrollEvent
 -   Added @ref Platform::Sdl2Application::MouseEvent::clickCount()
diff --git a/package/archlinux/PKGBUILD-emscripten b/package/archlinux/PKGBUILD-emscripten
index 54fc18fff..7318a46b1 100644
--- a/package/archlinux/PKGBUILD-emscripten
+++ b/package/archlinux/PKGBUILD-emscripten
@@ -28,6 +28,7 @@ build() {
     cmake .. \
         -DCMAKE_BUILD_TYPE=Release \
         -DCMAKE_INSTALL_PREFIX=/usr/lib/emscripten/system \
+        -DMAGNUM_DEPLOY_PREFIX=/srv/http/emscripten \
         -DWITH_AUDIO=ON \
         -DWITH_SDL2APPLICATION=ON \
         -WDITH_WINDOWLESSEGLAPPLICATION=ON \
@@ -36,6 +37,7 @@ build() {
         -DWITH_TGAIMAGECONVERTER=ON \
         -DWITH_TGAIMPORTER=ON \
         -DWITH_WAVAUDIOIMPORTER=ON \
+        -DWITH_MAGNUMINFO=ON \
         -DBUILD_TESTS=ON
     ninja
 }
diff --git a/package/archlinux/PKGBUILD-emscripten-noopt b/package/archlinux/PKGBUILD-emscripten-noopt
index a7104cf31..ab18c794d 100644
--- a/package/archlinux/PKGBUILD-emscripten-noopt
+++ b/package/archlinux/PKGBUILD-emscripten-noopt
@@ -28,6 +28,7 @@ build() {
     cmake .. \
         -DCMAKE_BUILD_TYPE=Release \
         -DCMAKE_INSTALL_PREFIX=/usr/lib/emscripten/system \
+        -DMAGNUM_DEPLOY_PREFIX=/srv/http/emscripten \
         -DCMAKE_CXX_FLAGS_RELEASE="-DNDEBUG -O1" \
         -DCMAKE_EXE_LINKER_FLAGS_RELEASE="-O1" \
         -DWITH_AUDIO=ON \
@@ -38,6 +39,7 @@ build() {
         -DWITH_TGAIMAGECONVERTER=ON \
         -DWITH_TGAIMPORTER=ON \
         -DWITH_WAVAUDIOIMPORTER=ON \
+        -DWITH_MAGNUMINFO=ON \
         -DBUILD_TESTS=ON
     ninja
 }
diff --git a/package/archlinux/PKGBUILD-emscripten-noopt-webgl2 b/package/archlinux/PKGBUILD-emscripten-noopt-webgl2
index d5161ca7e..cece9ad96 100644
--- a/package/archlinux/PKGBUILD-emscripten-noopt-webgl2
+++ b/package/archlinux/PKGBUILD-emscripten-noopt-webgl2
@@ -28,6 +28,7 @@ build() {
     cmake .. \
         -DCMAKE_BUILD_TYPE=Release \
         -DCMAKE_INSTALL_PREFIX=/usr/lib/emscripten/system \
+        -DMAGNUM_DEPLOY_PREFIX=/srv/http/emscripten \
         -DCMAKE_CXX_FLAGS_RELEASE="-DNDEBUG -O1" \
         -DCMAKE_EXE_LINKER_FLAGS_RELEASE="-O1" \
         -DTARGET_GLES2=OFF \
@@ -39,6 +40,7 @@ build() {
         -DWITH_TGAIMAGECONVERTER=ON \
         -DWITH_TGAIMPORTER=ON \
         -DWITH_WAVAUDIOIMPORTER=ON \
+        -DWITH_MAGNUMINFO=ON \
         -DBUILD_TESTS=ON
     ninja
 }
diff --git a/package/archlinux/PKGBUILD-emscripten-wasm b/package/archlinux/PKGBUILD-emscripten-wasm
index 011d95422..513eb4f2d 100644
--- a/package/archlinux/PKGBUILD-emscripten-wasm
+++ b/package/archlinux/PKGBUILD-emscripten-wasm
@@ -28,6 +28,7 @@ build() {
     cmake .. \
         -DCMAKE_BUILD_TYPE=Release \
         -DCMAKE_INSTALL_PREFIX=/usr/lib/emscripten/system \
+        -DMAGNUM_DEPLOY_PREFIX=/srv/http/emscripten \
         -DWITH_AUDIO=ON \
         -DWITH_SDL2APPLICATION=ON \
         -WDITH_WINDOWLESSEGLAPPLICATION=ON \
@@ -36,6 +37,7 @@ build() {
         -DWITH_TGAIMAGECONVERTER=ON \
         -DWITH_TGAIMPORTER=ON \
         -DWITH_WAVAUDIOIMPORTER=ON \
+        -DWITH_MAGNUMINFO=ON \
         -DBUILD_TESTS=ON
     ninja
 }
diff --git a/package/archlinux/PKGBUILD-emscripten-wasm-webgl2 b/package/archlinux/PKGBUILD-emscripten-wasm-webgl2
index 3253079cb..0d3674684 100644
--- a/package/archlinux/PKGBUILD-emscripten-wasm-webgl2
+++ b/package/archlinux/PKGBUILD-emscripten-wasm-webgl2
@@ -28,6 +28,7 @@ build() {
     cmake .. \
         -DCMAKE_BUILD_TYPE=Release \
         -DCMAKE_INSTALL_PREFIX=/usr/lib/emscripten/system \
+        -DMAGNUM_DEPLOY_PREFIX=/srv/http/emscripten \
         -DTARGET_GLES2=OFF \
         -DWITH_AUDIO=ON \
         -DWITH_SDL2APPLICATION=ON \
@@ -37,6 +38,7 @@ build() {
         -DWITH_TGAIMAGECONVERTER=ON \
         -DWITH_TGAIMPORTER=ON \
         -DWITH_WAVAUDIOIMPORTER=ON \
+        -DWITH_MAGNUMINFO=ON \
         -DBUILD_TESTS=ON
     ninja
 }
diff --git a/package/archlinux/PKGBUILD-emscripten-webgl2 b/package/archlinux/PKGBUILD-emscripten-webgl2
index 082d7737e..67ee9fd0e 100644
--- a/package/archlinux/PKGBUILD-emscripten-webgl2
+++ b/package/archlinux/PKGBUILD-emscripten-webgl2
@@ -28,6 +28,7 @@ build() {
     cmake .. \
         -DCMAKE_BUILD_TYPE=Release \
         -DCMAKE_INSTALL_PREFIX=/usr/lib/emscripten/system \
+        -DMAGNUM_DEPLOY_PREFIX=/srv/http/emscripten \
         -DTARGET_GLES2=OFF \
         -DWITH_AUDIO=ON \
         -DWITH_SDL2APPLICATION=ON \
@@ -37,6 +38,7 @@ build() {
         -DWITH_TGAIMAGECONVERTER=ON \
         -DWITH_TGAIMPORTER=ON \
         -DWITH_WAVAUDIOIMPORTER=ON \
+        -DWITH_MAGNUMINFO=ON \
         -DBUILD_TESTS=ON
     ninja
 }
diff --git a/package/ci/travis-emscripten.sh b/package/ci/travis-emscripten.sh
index 4b581e7b2..99eb87016 100755
--- a/package/ci/travis-emscripten.sh
+++ b/package/ci/travis-emscripten.sh
@@ -55,6 +55,7 @@ cmake .. \
     -DWITH_TGAIMAGECONVERTER=ON \
     -DWITH_TGAIMPORTER=ON \
     -DWITH_WAVAUDIOIMPORTER=ON \
+    -DWITH_MAGNUMINFO=ON \
     -DBUILD_TESTS=ON \
     -DTARGET_GLES2=$TARGET_GLES2
 # Otherwise the job gets killed (probably because using too much memory)
diff --git a/src/Magnum/Platform/CMakeLists.txt b/src/Magnum/Platform/CMakeLists.txt
index d01710b2a..9c761696d 100644
--- a/src/Magnum/Platform/CMakeLists.txt
+++ b/src/Magnum/Platform/CMakeLists.txt
@@ -726,7 +726,7 @@ endif()
 if(WITH_MAGNUMINFO)
     add_executable(magnum-info magnum-info.cpp)
     target_link_libraries(magnum-info Magnum)
-    if(MAGNUM_TARGET_HEADLESS)
+    if(MAGNUM_TARGET_HEADLESS OR CORRADE_TARGET_EMSCRIPTEN)
         target_link_libraries(magnum-info MagnumWindowlessEglApplication)
     elseif(CORRADE_TARGET_IOS)
         target_link_libraries(magnum-info MagnumWindowlessIosApplication)
@@ -749,12 +749,26 @@ if(WITH_MAGNUMINFO)
     endif()
     set_target_properties(magnum-info PROPERTIES FOLDER "Magnum/Platform")
 
-    install(TARGETS magnum-info DESTINATION ${MAGNUM_BINARY_INSTALL_DIR})
+    if(NOT CORRADE_TARGET_EMSCRIPTEN)
+        install(TARGETS magnum-info DESTINATION ${MAGNUM_BINARY_INSTALL_DIR})
+    endif()
+
     if(CORRADE_TARGET_IOS)
         set_target_properties(magnum-info PROPERTIES
             MACOSX_BUNDLE ON
             MACOSX_BUNDLE_INFO_PLIST ${CMAKE_CURRENT_SOURCE_DIR}/MacOSXBundleInfo.plist.in
             XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "YES")
+    elseif(CORRADE_TARGET_EMSCRIPTEN)
+        install(FILES magnum-info.html DESTINATION ${MAGNUM_DEPLOY_PREFIX}/magnum-info RENAME index.html)
+        install(TARGETS magnum-info DESTINATION ${MAGNUM_DEPLOY_PREFIX}/magnum-info)
+        install(FILES
+            WebApplication.css
+            WindowlessEmscriptenApplication.js
+            DESTINATION ${MAGNUM_DEPLOY_PREFIX}/magnum-info)
+        install(FILES
+            ${CMAKE_CURRENT_BINARY_DIR}/magnum-info.js.mem
+            ${CMAKE_CURRENT_BINARY_DIR}/magnum-info.wasm
+            DESTINATION ${MAGNUM_DEPLOY_PREFIX}/magnum-info OPTIONAL)
     endif()
 
     # Magnum info target alias for superprojects
diff --git a/src/Magnum/Platform/magnum-info.cpp b/src/Magnum/Platform/magnum-info.cpp
index 6e222f2d7..ea9b493b9 100644
--- a/src/Magnum/Platform/magnum-info.cpp
+++ b/src/Magnum/Platform/magnum-info.cpp
@@ -36,11 +36,13 @@
 #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
 #include "Magnum/CubeMapTextureArray.h"
 #endif
+#ifndef MAGNUM_TARGET_WEBGL
 #include "Magnum/DebugOutput.h"
+#endif
 #include "Magnum/Extensions.h"
 #include "Magnum/Framebuffer.h"
 #include "Magnum/Mesh.h"
-#ifndef MAGNUM_TARGET_GLES2
+#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
 #include "Magnum/MultisampleTexture.h"
 #endif
 #ifndef MAGNUM_TARGET_GLES
@@ -54,7 +56,7 @@
 #include "Magnum/TransformFeedback.h"
 #endif
 
-#ifdef MAGNUM_TARGET_HEADLESS
+#if defined(MAGNUM_TARGET_HEADLESS) || defined(CORRADE_TARGET_EMSCRIPTEN)
 #include "Magnum/Platform/WindowlessEglApplication.h"
 #elif defined(CORRADE_TARGET_IOS)
 #include "Magnum/Platform/WindowlessIosApplication.h"
@@ -251,7 +253,9 @@ MagnumInfo::MagnumInfo(const Arguments& arguments): Platform::WindowlessApplicat
     #ifndef MAGNUM_TARGET_GLES
     Debug() << "Core profile:" << (c.isCoreProfile() ? "yes" : "no");
     #endif
+    #ifndef MAGNUM_TARGET_WEBGL
     Debug() << "Context flags:" << c.flags();
+    #endif
     Debug() << "Detected driver:" << c.detectedDriver();
 
     Debug() << "Supported GLSL versions:";
@@ -336,11 +340,13 @@ MagnumInfo::MagnumInfo(const Arguments& arguments): Platform::WindowlessApplicat
     _l(Mesh::maxElementsVertices())
     #endif
     _l(Renderbuffer::maxSize())
+    #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
     _l(Renderbuffer::maxSamples())
+    #endif
     _l(Shader::maxVertexOutputComponents())
     _l(Shader::maxFragmentInputComponents())
     _l(Shader::maxTextureImageUnits(Shader::Type::Vertex))
-    #ifndef MAGNUM_TARGET_GLES2
+    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
     _l(Shader::maxTextureImageUnits(Shader::Type::TessellationControl))
     _l(Shader::maxTextureImageUnits(Shader::Type::TessellationEvaluation))
     _l(Shader::maxTextureImageUnits(Shader::Type::Geometry))
@@ -349,7 +355,7 @@ MagnumInfo::MagnumInfo(const Arguments& arguments): Platform::WindowlessApplicat
     _l(Shader::maxTextureImageUnits(Shader::Type::Fragment))
     _l(Shader::maxCombinedTextureImageUnits())
     _l(Shader::maxUniformComponents(Shader::Type::Vertex))
-    #ifndef MAGNUM_TARGET_GLES2
+    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
     _l(Shader::maxUniformComponents(Shader::Type::TessellationControl))
     _l(Shader::maxUniformComponents(Shader::Type::TessellationEvaluation))
     _l(Shader::maxUniformComponents(Shader::Type::Geometry))
@@ -377,7 +383,7 @@ MagnumInfo::MagnumInfo(const Arguments& arguments): Platform::WindowlessApplicat
     }
     #endif
 
-    #ifndef MAGNUM_TARGET_GLES2
+    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
     #ifndef MAGNUM_TARGET_GLES
     if(c.isExtensionSupported<Extensions::GL::ARB::compute_shader>())
     #endif
@@ -412,7 +418,7 @@ MagnumInfo::MagnumInfo(const Arguments& arguments): Platform::WindowlessApplicat
     }
     #endif
 
-    #ifndef MAGNUM_TARGET_GLES2
+    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
     #ifndef MAGNUM_TARGET_GLES
     if(c.isExtensionSupported<Extensions::GL::ARB::shader_atomic_counters>())
     #endif
@@ -483,7 +489,7 @@ MagnumInfo::MagnumInfo(const Arguments& arguments): Platform::WindowlessApplicat
     }
     #endif
 
-    #ifndef MAGNUM_TARGET_GLES2
+    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
     #ifndef MAGNUM_TARGET_GLES
     if(c.isExtensionSupported<Extensions::GL::ARB::texture_multisample>())
     #endif
@@ -520,17 +526,21 @@ MagnumInfo::MagnumInfo(const Arguments& arguments): Platform::WindowlessApplicat
         _l(Buffer::uniformOffsetAlignment())
         _l(Buffer::maxUniformBindings())
         _l(Shader::maxUniformBlocks(Shader::Type::Vertex))
+        #ifndef MAGNUM_TARGET_WEBGL
         _l(Shader::maxUniformBlocks(Shader::Type::TessellationControl))
         _l(Shader::maxUniformBlocks(Shader::Type::TessellationEvaluation))
         _l(Shader::maxUniformBlocks(Shader::Type::Geometry))
         _l(Shader::maxUniformBlocks(Shader::Type::Compute))
+        #endif
         _l(Shader::maxUniformBlocks(Shader::Type::Fragment))
         _l(Shader::maxCombinedUniformBlocks())
         _l(Shader::maxCombinedUniformComponents(Shader::Type::Vertex))
+        #ifndef MAGNUM_TARGET_WEBGL
         _l(Shader::maxCombinedUniformComponents(Shader::Type::TessellationControl))
         _l(Shader::maxCombinedUniformComponents(Shader::Type::TessellationEvaluation))
         _l(Shader::maxCombinedUniformComponents(Shader::Type::Geometry))
         _l(Shader::maxCombinedUniformComponents(Shader::Type::Compute))
+        #endif
         _l(Shader::maxCombinedUniformComponents(Shader::Type::Fragment))
         _l(AbstractShaderProgram::maxUniformBlockSize())
     }
@@ -679,6 +689,7 @@ MagnumInfo::MagnumInfo(const Arguments& arguments): Platform::WindowlessApplicat
         _l(Sampler::maxMaxAnisotropy())
     }
 
+    #ifndef MAGNUM_TARGET_WEBGL
     if(c.isExtensionSupported<Extensions::GL::KHR::debug>()) {
         _h(KHR::debug)
 
@@ -687,8 +698,9 @@ MagnumInfo::MagnumInfo(const Arguments& arguments): Platform::WindowlessApplicat
         _l(DebugOutput::maxMessageLength())
         _l(DebugGroup::maxStackDepth())
     }
+    #endif
 
-    #ifdef MAGNUM_TARGET_GLES2
+    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
     if(c.isExtensionSupported<Extensions::GL::OES::texture_3D>()) {
         _h(OES::texture_3D)
 
diff --git a/src/Magnum/Platform/magnum-info.html b/src/Magnum/Platform/magnum-info.html
new file mode 100644
index 000000000..797094d1e
--- /dev/null
+++ b/src/Magnum/Platform/magnum-info.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <head>
+    <title>Magnum Info</title>
+    <meta charset="utf-8" />
+    <link rel="stylesheet" href="WebApplication.css" />
+  </head>
+  <body>
+    <h1>Magnum Info</h1>
+    <div id="listener">
+      <canvas id="module" class="hidden"></canvas>
+      <pre id="log"></pre>
+      <div id="status">Initialization...</div>
+      <div id="statusDescription"></div>
+      <script src="WindowlessEmscriptenApplication.js"></script>
+      <script async="async" src="magnum-info.js"></script>
+    </div>
+  </body>
+</html>