sw/gl/wg: ++threads safety

Considered global engine initialization and termination.
Engines could be used among multiple worker threads.

src/renderer/gl_engine/tvgGlRenderer.cpp

@@ -20,6 +20,7 @@
  * SOFTWARE.
  */
 
+#include <atomic>
 #include "tvgGlCommon.h"
 #include "tvgGlRenderer.h"
 #include "tvgGlGpuBuffer.h"
@@ -33,8 +34,8 @@
 
 #define NOISE_LEVEL 0.5f
 
-static int32_t initEngineCnt = false;
-static int32_t rendererCnt = 0;
+static atomic<int32_t> initEngineCnt{};
+static atomic<int32_t> rendererCnt{};
 
 
 static void _termEngine()
@@ -1285,7 +1286,7 @@ bool GlRenderer::postUpdate()
 }
 
 
-int GlRenderer::init(uint32_t threads)
+bool GlRenderer::init(uint32_t threads)
 {
     if ((initEngineCnt++) > 0) return true;
 
@@ -1301,7 +1302,7 @@ int32_t GlRenderer::init()
 }
 
 
-int GlRenderer::term()
+bool GlRenderer::term()
 {
     if ((--initEngineCnt) > 0) return true;
 

src/renderer/gl_engine/tvgGlRenderer.h

@@ -93,9 +93,9 @@ public:
     void dispose(TVG_UNUSED RenderEffect* effect) override;
 
     static GlRenderer* gen();
-    static int init(TVG_UNUSED uint32_t threads);
+    static bool init(TVG_UNUSED uint32_t threads);
     static int32_t init();
-    static int term();
+    static bool term();
 
 private:
     GlRenderer(); 

src/renderer/sw_engine/tvgSwRenderer.cpp

@@ -24,6 +24,7 @@
     #include <omp.h>
 #endif
 #include <algorithm>
+#include <atomic>
 #include "tvgMath.h"
 #include "tvgSwCommon.h"
 #include "tvgTaskScheduler.h"
@@ -32,8 +33,8 @@
 /************************************************************************/
 /* Internal Class Implementation                                        */
 /************************************************************************/
-static int32_t initEngineCnt = false;
-static int32_t rendererCnt = 0;
+static atomic<int32_t> initEngineCnt{};
+static atomic<int32_t> rendererCnt{};
 static SwMpool* globalMpool = nullptr;
 static uint32_t threadsCnt = 0;
 

src/renderer/tvgSwCanvas.cpp

@@ -76,7 +76,7 @@ Result SwCanvas::target(uint32_t* buffer, uint32_t stride, uint32_t w, uint32_t
     auto renderer = static_cast<SwRenderer*>(pImpl->renderer);
     if (!renderer) return Result::MemoryCorruption;
 
-    if (!renderer->target(buffer, stride, w, h, static_cast<ColorSpace>(cs))) return Result::InvalidArguments;
+    if (!renderer->target(buffer, stride, w, h, cs)) return Result::InvalidArguments;
     pImpl->vport = {0, 0, (int32_t)w, (int32_t)h};
     renderer->viewport(pImpl->vport);
 

src/renderer/tvgWgCanvas.cpp

@@ -74,6 +74,7 @@ Result WgCanvas::target(void* device, void* instance, void* target, uint32_t w,
 WgCanvas* WgCanvas::gen() noexcept
 {
 #ifdef THORVG_WG_RASTER_SUPPORT
+    if (WgRenderer::init() <= 0) return nullptr;
     return new WgCanvas;
 #endif
     return nullptr;

src/renderer/wg_engine/tvgWgRenderer.cpp

@@ -20,21 +20,23 @@
  * SOFTWARE.
  */
 
+#include <atomic>
 #include "tvgWgRenderer.h"
 
-WgRenderer::WgRenderer()
+
+/************************************************************************/
+/* Internal Class Implementation                                        */
+/************************************************************************/
+
+static atomic<int32_t> initEngineCnt{};
+static atomic<int32_t> rendererCnt{};
+
+
+static void _termEngine()
 {
-}
+    if (rendererCnt > 0) return;
 
-
-WgRenderer::~WgRenderer()
-{
-    release();
-}
-
-
-void WgRenderer::initialize()
-{
+    //TODO:
 }
 
 
@@ -84,6 +86,58 @@ void WgRenderer::disposeObjects()
 }
 
 
+void WgRenderer::releaseSurfaceTexture()
+{
+    if (surfaceTexture.texture) {
+        wgpuTextureRelease(surfaceTexture.texture);
+        surfaceTexture.texture = nullptr;
+    }
+}
+
+
+void WgRenderer::clearTargets()
+{
+    releaseSurfaceTexture();
+    if (surface) wgpuSurfaceUnconfigure(surface);
+    targetTexture = nullptr;
+    surface = nullptr;
+    mTargetSurface.stride = 0;
+    mTargetSurface.w = 0;
+    mTargetSurface.h = 0;
+
+}
+
+
+bool WgRenderer::surfaceConfigure(WGPUSurface surface, WgContext& context, uint32_t width, uint32_t height)
+{
+    // store target surface properties
+    this->surface = surface;
+    if (width == 0 || height == 0 || !surface) return false;
+
+    // setup surface configuration
+    WGPUSurfaceConfiguration surfaceConfiguration {
+        .device = context.device,
+        .format = context.preferredFormat,
+        .usage = WGPUTextureUsage_RenderAttachment,
+    #ifdef __EMSCRIPTEN__
+        .alphaMode = WGPUCompositeAlphaMode_Premultiplied,
+    #endif
+        .width = width,
+        .height = height,
+    #ifndef __EMSCRIPTEN__
+        .presentMode = WGPUPresentMode_Fifo,
+    #endif
+    };
+    wgpuSurfaceConfigure(surface, &surfaceConfiguration);
+    return true;
+}
+
+
+/************************************************************************/
+/* External Class Implementation                                        */
+/************************************************************************/
+
+
 RenderData WgRenderer::prepare(const RenderShape& rshape, RenderData data, const Matrix& transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags, bool clipper)
 {
     // get or create render data shape
@@ -254,15 +308,6 @@ bool WgRenderer::clear()
 }
 
 
-void WgRenderer::releaseSurfaceTexture()
-{
-    if (surfaceTexture.texture) {
-        wgpuTextureRelease(surfaceTexture.texture);
-        surfaceTexture.texture = nullptr;
-    }
-}
-
-
 bool WgRenderer::sync()
 {
     disposeObjects();
@@ -368,41 +413,18 @@ bool WgRenderer::target(WGPUDevice device, WGPUInstance instance, void* target,
 }
 
 
-void WgRenderer::clearTargets()
+WgRenderer::WgRenderer()
 {
-    releaseSurfaceTexture();
-    if (surface) wgpuSurfaceUnconfigure(surface);
-    targetTexture = nullptr;
-    surface = nullptr;
-    mTargetSurface.stride = 0;
-    mTargetSurface.w = 0;
-    mTargetSurface.h = 0;
-
 }
 
 
-bool WgRenderer::surfaceConfigure(WGPUSurface surface, WgContext& context, uint32_t width, uint32_t height)
+WgRenderer::~WgRenderer()
 {
-    // store target surface properties
-    this->surface = surface;
-    if (width == 0 || height == 0 || !surface) return false;
+    release();
 
-    // setup surface configuration
-    WGPUSurfaceConfiguration surfaceConfiguration {
-        .device = context.device,
-        .format = context.preferredFormat,
-        .usage = WGPUTextureUsage_RenderAttachment,
-    #ifdef __EMSCRIPTEN__
-        .alphaMode = WGPUCompositeAlphaMode_Premultiplied,
-    #endif
-        .width = width,
-        .height = height,
-    #ifndef __EMSCRIPTEN__
-        .presentMode = WGPUPresentMode_Fifo,
-    #endif
-    };
-    wgpuSurfaceConfigure(surface, &surfaceConfiguration);
-    return true;
+    --rendererCnt;
+
+    if (rendererCnt == 0 && initEngineCnt == 0) _termEngine();
 }
 
 
@@ -559,19 +581,36 @@ bool WgRenderer::postUpdate()
 }
 
 
-WgRenderer* WgRenderer::gen()
+bool WgRenderer::init(TVG_UNUSED uint32_t threads)
 {
-    return new WgRenderer();
+    if ((initEngineCnt++) > 0) return true;
+
+    //TODO: global engine init
+
+    return true;
 }
 
 
-bool WgRenderer::init(TVG_UNUSED uint32_t threads)
+int32_t WgRenderer::init()
 {
-    return true;
+    return initEngineCnt;
 }
 
 
 bool WgRenderer::term()
 {
+    if ((--initEngineCnt) > 0) return true;
+
+    initEngineCnt = 0;
+
+    _termEngine();
+
     return true;
 }
+
+
+WgRenderer* WgRenderer::gen()
+{
+    ++rendererCnt;
+    return new WgRenderer();
+}

src/renderer/wg_engine/tvgWgRenderer.h

@@ -60,12 +60,12 @@ public:
 
     static WgRenderer* gen();
     static bool init(uint32_t threads);
+    static int32_t init();
     static bool term();
 
 private:
     WgRenderer();
     ~WgRenderer();
-    void initialize();
     void release();
     void disposeObjects();
     void releaseSurfaceTexture();