wg_engine: multisampling support

Used native hardware MSAA x4

Full multisampling support including custom blend and compositions.
Must be verified on web and 4K resolution for performance issues

src/renderer/wg_engine/tvgWgCommon.cpp

@@ -111,18 +111,18 @@ WGPUTexture WgContext::createTexture(uint32_t width, uint32_t height, WGPUTextur
 }
 
 
-WGPUTexture WgContext::createTexStorage(uint32_t width, uint32_t height, WGPUTextureFormat format, uint32_t sc)
+WGPUTexture WgContext::createTexStorage(uint32_t width, uint32_t height, WGPUTextureFormat format)
 {
     const WGPUTextureDescriptor textureDesc {
         .usage = WGPUTextureUsage_CopySrc | WGPUTextureUsage_CopyDst | WGPUTextureUsage_TextureBinding | WGPUTextureUsage_StorageBinding | WGPUTextureUsage_RenderAttachment,
         .dimension = WGPUTextureDimension_2D, .size = { width, height, 1 },
-        .format = format, .mipLevelCount = 1, .sampleCount = sc
+        .format = format, .mipLevelCount = 1, .sampleCount = 1
     };
     return wgpuDeviceCreateTexture(device, &textureDesc);
 }
 
 
-WGPUTexture WgContext::createTexStencil(uint32_t width, uint32_t height, WGPUTextureFormat format, uint32_t sc)
+WGPUTexture WgContext::createTexAttachement(uint32_t width, uint32_t height, WGPUTextureFormat format, uint32_t sc)
 {
     const WGPUTextureDescriptor textureDesc {
         .usage = WGPUTextureUsage_RenderAttachment,

src/renderer/wg_engine/tvgWgCommon.h

@@ -54,8 +54,8 @@ struct WgContext {
     // create common objects
     WGPUSampler createSampler(WGPUFilterMode filter, WGPUMipmapFilterMode mipmapFilter, WGPUAddressMode addrMode);
     WGPUTexture createTexture(uint32_t width, uint32_t height, WGPUTextureFormat format);
-    WGPUTexture createTexStorage(uint32_t width, uint32_t height, WGPUTextureFormat format, uint32_t sc = 1);
-    WGPUTexture createTexStencil(uint32_t width, uint32_t height, WGPUTextureFormat format, uint32_t sc = 1);
+    WGPUTexture createTexStorage(uint32_t width, uint32_t height, WGPUTextureFormat format);
+    WGPUTexture createTexAttachement(uint32_t width, uint32_t height, WGPUTextureFormat format, uint32_t sc);
     WGPUTextureView createTextureView(WGPUTexture texture);
     bool allocateTexture(WGPUTexture& texture, uint32_t width, uint32_t height, WGPUTextureFormat format, void* data);
 

src/renderer/wg_engine/tvgWgCompositor.cpp

@@ -31,8 +31,10 @@ void WgCompositor::initialize(WgContext& context, uint32_t width, uint32_t heigh
     this->width = width;
     this->height = height;
     // allocate global stencil buffer handles
-    texStencil = context.createTexStencil(width, height, WGPUTextureFormat_Depth24PlusStencil8);
-    texViewStencil = context.createTextureView(texStencil);
+    texDepthStencil = context.createTexAttachement(width, height, WGPUTextureFormat_Depth24PlusStencil8, 1);
+    texViewDepthStencil = context.createTextureView(texDepthStencil);
+    texDepthStencilMS = context.createTexAttachement(width, height, WGPUTextureFormat_Depth24PlusStencil8, 4);
+    texViewDepthStencilMS = context.createTextureView(texDepthStencilMS);
     // allocate global view matrix handles
     WgShaderTypeMat4x4f viewMat(width, height);
     context.allocateBufferUniform(bufferViewMat, &viewMat, sizeof(viewMat));
@@ -65,8 +67,10 @@ void WgCompositor::release(WgContext& context)
     context.pipelines->layouts.releaseBindGroup(bindGroupViewMat);
     context.releaseBuffer(bufferViewMat);
     // release global stencil buffer handles
-    context.releaseTextureView(texViewStencil);
-    context.releaseTexture(texStencil);
+    context.releaseTextureView(texViewDepthStencilMS);
+    context.releaseTexture(texDepthStencilMS);
+    context.releaseTextureView(texViewDepthStencil);
+    context.releaseTexture(texDepthStencil);
     height = 0;
     width = 0;
     pipelines = nullptr;
@@ -91,15 +95,16 @@ void WgCompositor::beginRenderPass(WGPUCommandEncoder commandEncoder, WgRenderSt
     this->currentTarget = target;
     this->commandEncoder = commandEncoder;
     const WGPURenderPassDepthStencilAttachment depthStencilAttachment{ 
-        .view = texViewStencil,
+        .view = texViewDepthStencilMS,
         .depthLoadOp = WGPULoadOp_Load, .depthStoreOp = WGPUStoreOp_Discard, .depthClearValue = 1.0f,
         .stencilLoadOp = WGPULoadOp_Load, .stencilStoreOp = WGPUStoreOp_Discard, .stencilClearValue = 0
     };
     //WGPURenderPassDepthStencilAttachment depthStencilAttachment{ .view = texViewStencil, .depthClearValue = 1.0f, .stencilLoadOp = WGPULoadOp_Clear, .stencilStoreOp = WGPUStoreOp_Discard };
     WGPURenderPassColorAttachment colorAttachment{};
-    colorAttachment.view = target->texView,
+    colorAttachment.view = target->texViewMS,
     colorAttachment.loadOp = clear ? WGPULoadOp_Clear : WGPULoadOp_Load,
     colorAttachment.storeOp = WGPUStoreOp_Store;
+    colorAttachment.resolveTarget = target->texView;
     #ifdef __EMSCRIPTEN__
     colorAttachment.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
     #endif
@@ -204,7 +209,7 @@ void WgCompositor::composeScene(WgContext& context, WgRenderStorage* src, WgRend
 
 void WgCompositor::blit(WgContext& context, WGPUCommandEncoder encoder, WgRenderStorage* src, WGPUTextureView dstView) {
     const WGPURenderPassDepthStencilAttachment depthStencilAttachment{ 
-        .view = texViewStencil,
+        .view = texViewDepthStencil,
         .depthLoadOp = WGPULoadOp_Load, .depthStoreOp = WGPUStoreOp_Discard,
         .stencilLoadOp = WGPULoadOp_Load, .stencilStoreOp = WGPUStoreOp_Discard
     };

src/renderer/wg_engine/tvgWgCompositor.h

@@ -37,9 +37,11 @@ class WgCompositor
 private:
     // pipelines (external handle, do not release)
     WgPipelines* pipelines{};
-    // global stencil buffer handles
-    WGPUTexture texStencil{};
-    WGPUTextureView texViewStencil{};
+    // global stencil/depth buffer handles
+    WGPUTexture texDepthStencil{};
+    WGPUTextureView texViewDepthStencil{};
+    WGPUTexture texDepthStencilMS{};
+    WGPUTextureView texViewDepthStencilMS{};
     // global view matrix handles
     WGPUBuffer bufferViewMat{};
     WGPUBindGroup bindGroupViewMat{};

src/renderer/wg_engine/tvgWgPipelines.cpp

@@ -146,7 +146,8 @@ void WgPipelines::initialize(WgContext& context)
     const WGPUVertexBufferLayout vertexBufferLayoutTex { .arrayStride = 8, .stepMode = WGPUVertexStepMode_Vertex, .attributeCount = 1, .attributes = vertexAttributesTex };
     const WGPUVertexBufferLayout vertexBufferLayoutsShape[] { vertexBufferLayoutPos };
     const WGPUVertexBufferLayout vertexBufferLayoutsImage[] { vertexBufferLayoutPos, vertexBufferLayoutTex };
-    const WGPUMultisampleState multisampleState { .count = 1, .mask = 0xFFFFFFFF, .alphaToCoverageEnabled = false };
+    const WGPUMultisampleState multisampleState   { .count = 4, .mask = 0xFFFFFFFF, .alphaToCoverageEnabled = false };
+    const WGPUMultisampleState multisampleStateX1 { .count = 1, .mask = 0xFFFFFFFF, .alphaToCoverageEnabled = false };
     const WGPUTextureFormat offscreenTargetFormat = WGPUTextureFormat_RGBA8Unorm;
 
     // blend states
@@ -452,7 +453,7 @@ void WgPipelines::initialize(WgContext& context)
         WGPUColorWriteMask_All, context.preferredFormat,
         WGPUCompareFunction_Always, WGPUStencilOperation_Zero,
         WGPUCompareFunction_Always, WGPUStencilOperation_Zero,
-        WGPUCompareFunction_Always, false, multisampleState, blendStateSrc);
+        WGPUCompareFunction_Always, false, multisampleStateX1, blendStateSrc);
 }
 
 void WgPipelines::releaseGraphicHandles(WgContext& context)

src/renderer/wg_engine/tvgWgRenderTarget.cpp

@@ -27,7 +27,9 @@ void WgRenderStorage::initialize(WgContext& context, uint32_t width, uint32_t he
     this->width = width;
     this->height = height;
     texture = context.createTexStorage(width, height, WGPUTextureFormat_RGBA8Unorm);
+    textureMS = context.createTexAttachement(width, height, WGPUTextureFormat_RGBA8Unorm, 4);
     texView = context.createTextureView(texture);
+    texViewMS = context.createTextureView(textureMS);
     bindGroupRead = context.pipelines->layouts.createBindGroupStrorage1RO(texView);
     bindGroupWrite = context.pipelines->layouts.createBindGroupStrorage1WO(texView);
     bindGroupTexure = context.pipelines->layouts.createBindGroupTexSampled(context.samplerNearestRepeat, texView);
@@ -39,6 +41,8 @@ void WgRenderStorage::release(WgContext& context)
     context.pipelines->layouts.releaseBindGroup(bindGroupTexure);
     context.pipelines->layouts.releaseBindGroup(bindGroupWrite);
     context.pipelines->layouts.releaseBindGroup(bindGroupRead);
+    context.releaseTextureView(texViewMS);
+    context.releaseTexture(textureMS);
     context.releaseTextureView(texView);
     context.releaseTexture(texture);
     height = 0;

src/renderer/wg_engine/tvgWgRenderTarget.h

@@ -28,7 +28,9 @@
 
 struct WgRenderStorage {
     WGPUTexture texture{};
+    WGPUTexture textureMS{};
     WGPUTextureView texView{};
+    WGPUTextureView texViewMS{};
     WGPUBindGroup bindGroupRead{};
     WGPUBindGroup bindGroupWrite{};
     WGPUBindGroup bindGroupTexure{};