Vulkan: Fold deferred clears into current clears

src/libANGLE/renderer/vulkan/ContextVk.cpp

@@ -4690,6 +4690,8 @@ angle::Result ContextVk::beginNewRenderPass(
     // Restart at subpass 0.
     mGraphicsPipelineDesc->resetSubpass(&mGraphicsPipelineTransition);
 
+    mPerfCounters.renderPasses++;
+
     return angle::Result::Continue;
 }
 
@@ -4715,8 +4717,6 @@ angle::Result ContextVk::startRenderPass(gl::Rectangle renderArea,
         *commandBufferOut = mRenderPassCommandBuffer;
     }
 
-    mPerfCounters.renderPasses++;
-
     return angle::Result::Continue;
 }
 

src/libANGLE/renderer/vulkan/FramebufferVk.cpp

@@ -422,12 +422,6 @@ angle::Result FramebufferVk::clearImpl(const gl::Context *context,
         return angle::Result::Continue;
     }
 
-    // We can sometimes get to a clear operation with other pending clears (e.g. for emulated
-    // formats). Ensure the prior clears happen before the new clear. Note that we do not defer
-    // clears for scissored operations. Note that some clears may be redundant with the current
-    // clear. Due to complexity we haven't implemented de-duplication here.
-    ANGLE_TRY(flushDeferredClears(contextVk, scissoredRenderArea));
-
     // This function assumes that only enabled attachments are asked to be cleared.
     ASSERT((clearColorBuffers & mState.getEnabledDrawBuffers()) == clearColorBuffers);
 
@@ -445,7 +439,7 @@ angle::Result FramebufferVk::clearImpl(const gl::Context *context,
     clearStencil                                       = clearStencil && stencilAttachment;
     ASSERT(!clearStencil || stencilAttachment->isAttached());
 
-    uint8_t stencilMask =
+    const uint8_t stencilMask =
         static_cast<uint8_t>(contextVk->getState().getDepthStencilState().stencilWritemask);
 
     // The front-end should ensure we don't attempt to clear color if all channels are masked.
@@ -455,105 +449,127 @@ angle::Result FramebufferVk::clearImpl(const gl::Context *context,
     // The front-end should ensure we don't attempt to clear stencil if all bits are masked.
     ASSERT(!clearStencil || stencilMask != 0);
 
-    bool scissoredClear = scissoredRenderArea != getRotatedCompleteRenderArea(contextVk);
+    const bool scissoredClear = scissoredRenderArea != getRotatedCompleteRenderArea(contextVk);
 
     // If there is nothing to clear, return right away (for example, if asked to clear depth, but
     // there is no depth attachment).
     if (!clearColor && !clearDepth && !clearStencil)
     {
-        return angle::Result::Continue;
+        // We can sometimes get to a clear operation with other pending clears (e.g. for emulated
+        // formats). Ensure the prior clears happen if new clear is no-op.
+        return flushDeferredClears(contextVk, scissoredRenderArea);
     }
 
-    // We can use render pass load ops if clearing depth, unmasked color or unmasked stencil.  If
-    // there's a depth mask, depth clearing is already disabled.
-    bool maskedClearColor = clearColor && (mActiveColorComponentMasksForClear & colorMasks) !=
-                                              mActiveColorComponentMasksForClear;
-    bool maskedClearStencil = clearStencil && stencilMask != 0xFF;
-
-    bool clearColorWithRenderPassLoadOp   = clearColor && !maskedClearColor && !scissoredClear;
-    bool clearDepthWithRenderPassLoadOp   = clearDepth && !scissoredClear;
-    bool clearStencilWithRenderPassLoadOp = clearStencil && !maskedClearStencil && !scissoredClear;
+    // We use the draw path if scissored clear, or color or stencil are masked.  Note that depth
+    // clearing is already disabled if there's a depth mask.
+    const bool maskedClearColor = clearColor && (mActiveColorComponentMasksForClear & colorMasks) !=
+                                                    mActiveColorComponentMasksForClear;
+    const bool maskedClearStencil = clearStencil && stencilMask != 0xFF;
 
-    // At least one of color, depth or stencil should be clearable with render pass loadOp for us
-    // to use this clear path.
-    bool clearAnyWithRenderPassLoadOp = clearColorWithRenderPassLoadOp ||
-                                        clearDepthWithRenderPassLoadOp ||
-                                        clearStencilWithRenderPassLoadOp;
+    bool clearColorWithDraw   = clearColor && (maskedClearColor || scissoredClear);
+    bool clearDepthWithDraw   = clearDepth && scissoredClear;
+    bool clearStencilWithDraw = clearStencil && (maskedClearStencil || scissoredClear);
 
-    if (clearAnyWithRenderPassLoadOp)
+    vk::Framebuffer *currentFramebuffer = nullptr;
+    ANGLE_TRY(getFramebuffer(contextVk, &currentFramebuffer, nullptr));
+    const bool isMidRenderPassClear =
+        contextVk->hasStartedRenderPassWithCommands() &&
+        contextVk->hasStartedRenderPassWithFramebuffer(currentFramebuffer);
+    const bool preferDrawOverClearAttachments =
+        contextVk->getRenderer()->getFeatures().preferDrawClearOverVkCmdClearAttachments.enabled;
+
+    // Merge current clears with the deferred clears, then proceed with only processing deferred
+    // clears.  This simplifies the clear paths such that they don't need to consider both the
+    // current and deferred clears.  Additionally, it avoids needing to undo an unresolve
+    // operation; say attachment A is deferred cleared and multisampled-render-to-texture
+    // attachment B is currently cleared.  Assuming a render pass needs to start (because for
+    // example attachment C needs to clear with a draw path), starting one with only deferred
+    // clears and then applying the current clears won't work as attachment B is unresolved, and
+    // there are no facilities to undo that.
+    if (preferDrawOverClearAttachments && isMidRenderPassClear)
+    {
+        // On buggy hardware, prefer to clear with a draw call instead of vkCmdClearAttachments.
+        // In this case, flush deferred clears and don't merge current clears (so they take the draw
+        // path).  Note that this path could be optimized by a clearWithDraw-like call that operates
+        // on mDeferredClears.  However, having deferred clears mid-render-pass is rare (if at all
+        // possible).
+        ANGLE_TRY(flushDeferredClears(contextVk, scissoredRenderArea));
+
+        clearColorWithDraw   = clearColor;
+        clearDepthWithDraw   = clearDepth;
+        clearStencilWithDraw = clearStencil;
+    }
+    else
     {
-        vk::Framebuffer *currentFramebuffer = nullptr;
-        ANGLE_TRY(getFramebuffer(contextVk, &currentFramebuffer, nullptr));
-
         gl::DrawBufferMask clearColorDrawBuffersMask;
-        if (clearColorWithRenderPassLoadOp)
+        if (clearColor && !clearColorWithDraw)
         {
             clearColorDrawBuffersMask = clearColorBuffers;
         }
 
+        mergeClearsWithDeferredClears(clearColorDrawBuffersMask, clearDepth && !clearDepthWithDraw,
+                                      clearStencil && !clearStencilWithDraw, clearColorValue,
+                                      clearDepthStencilValue);
+    }
+
+    // If any deferred clears, we can further defer them, modify the current render pass' loadOps,
+    // or clear them with vkCmdClearAttachments.
+    if (mDeferredClears.any())
+    {
+        const bool clearAnyWithDraw =
+            clearColorWithDraw || clearDepthWithDraw || clearStencilWithDraw;
+
         // If we are in an active renderpass that has recorded commands and the framebuffer hasn't
         // changed, inline the clear
-        if (contextVk->hasStartedRenderPassWithCommands() &&
-            contextVk->hasStartedRenderPassWithFramebuffer(currentFramebuffer))
+        if (isMidRenderPassClear)
         {
             ANGLE_PERF_WARNING(
                 contextVk->getDebug(), GL_DEBUG_SEVERITY_LOW,
                 "Clear effectively discarding previous draw call results. Suggest earlier Clear "
                 "followed by masked color or depth/stencil draw calls instead");
 
-            RendererVk *renderer     = contextVk->getRenderer();
-            bool clearAnyWithCommand = clearAnyWithRenderPassLoadOp;
+            ASSERT(!preferDrawOverClearAttachments);
 
-            // On buggy hardware, prefer to clear with a draw call instead of vkCmdClearAttachments.
-            if (renderer->getFeatures().preferDrawClearOverVkCmdClearAttachments.enabled)
+            // clearWithCommand will operate on deferred clears.
+            ANGLE_TRY(clearWithCommand(contextVk, &contextVk->getStartedRenderPassCommands(),
+                                       scissoredRenderArea));
+        }
+        else
+        {
+            // This path will defer the current clears along with deferred clears.  This won't work
+            // if any attachment needs to be subsequently cleared with a draw call.  In that case,
+            // flush deferred clears, which will start a render pass with deferred clear values.
+            // The subsequent draw call will then operate on the cleared attachments.
+            if (!contextVk->hasStartedRenderPass() && clearAnyWithDraw)
             {
-                clearColorWithRenderPassLoadOp   = false;
-                clearDepthWithRenderPassLoadOp   = false;
-                clearStencilWithRenderPassLoadOp = false;
-                clearAnyWithCommand              = false;
+                ANGLE_TRY(flushDeferredClears(contextVk, scissoredRenderArea));
             }
-
-            if (clearAnyWithCommand)
+            else
             {
-                ANGLE_TRY(clearWithCommand(
-                    contextVk, &contextVk->getStartedRenderPassCommands(), scissoredRenderArea,
-                    clearColorDrawBuffersMask, clearDepthWithRenderPassLoadOp,
-                    clearStencilWithRenderPassLoadOp, clearColorValue, clearDepthStencilValue));
+                // clearWithLoadOp will operate on deferred clears.  Either these will affect the
+                // currently open render pass' loadOps, or will be re-staged.  The latter will
+                // further defer these clears.
+                ANGLE_TRY(clearWithLoadOp(contextVk));
             }
         }
-        else
-        {
-            ANGLE_TRY(clearWithLoadOp(
-                contextVk, clearColorDrawBuffersMask, clearDepthWithRenderPassLoadOp,
-                clearStencilWithRenderPassLoadOp, clearColorValue, clearDepthStencilValue));
-        }
-
-        // Fallback to other methods for whatever isn't cleared here.
-        if (clearColorWithRenderPassLoadOp)
-        {
-            clearColorBuffers.reset();
-            clearColor = false;
-        }
-        if (clearDepthWithRenderPassLoadOp)
-        {
-            clearDepth = false;
-        }
-        if (clearStencilWithRenderPassLoadOp)
-        {
-            clearStencil = false;
-        }
 
         // If nothing left to clear, early out.
-        if (!clearColor && !clearDepth && !clearStencil)
+        if (!clearAnyWithDraw)
         {
+            ASSERT(mDeferredClears.empty());
             return angle::Result::Continue;
         }
     }
 
+    if (!clearColorWithDraw)
+    {
+        clearColorBuffers.reset();
+    }
+
     // The most costly clear mode is when we need to mask out specific color channels or stencil
     // bits. This can only be done with a draw call.
-    return clearWithDraw(contextVk, scissoredRenderArea, clearColorBuffers, clearDepth,
-                         clearStencil, colorMasks, stencilMask, clearColorValue,
+    return clearWithDraw(contextVk, scissoredRenderArea, clearColorBuffers, clearDepthWithDraw,
+                         clearStencilWithDraw, colorMasks, stencilMask, clearColorValue,
                          clearDepthStencilValue);
 }
 
@@ -1968,6 +1984,43 @@ angle::Result FramebufferVk::getFramebuffer(ContextVk *contextVk,
     return angle::Result::Continue;
 }
 
+void FramebufferVk::mergeClearsWithDeferredClears(
+    gl::DrawBufferMask clearColorBuffers,
+    bool clearDepth,
+    bool clearStencil,
+    const VkClearColorValue &clearColorValue,
+    const VkClearDepthStencilValue &clearDepthStencilValue)
+{
+    // Apply clears to mDeferredClears.  Note that clears override deferred clears.
+
+    // Color clears.
+    for (size_t colorIndexGL : clearColorBuffers)
+    {
+        ASSERT(mState.getEnabledDrawBuffers().test(colorIndexGL));
+        VkClearValue clearValue = getCorrectedColorClearValue(colorIndexGL, clearColorValue);
+        mDeferredClears.store(static_cast<uint32_t>(colorIndexGL), VK_IMAGE_ASPECT_COLOR_BIT,
+                              clearValue);
+    }
+
+    // Depth and stencil clears.
+    VkImageAspectFlags dsAspectFlags = 0;
+    VkClearValue dsClearValue;
+    dsClearValue.depthStencil = clearDepthStencilValue;
+    if (clearDepth)
+    {
+        dsAspectFlags |= VK_IMAGE_ASPECT_DEPTH_BIT;
+    }
+    if (clearStencil)
+    {
+        dsAspectFlags |= VK_IMAGE_ASPECT_STENCIL_BIT;
+    }
+
+    if (dsAspectFlags != 0)
+    {
+        mDeferredClears.store(vk::kUnpackedDepthIndex, dsAspectFlags, dsClearValue);
+    }
+}
+
 angle::Result FramebufferVk::clearWithDraw(ContextVk *contextVk,
                                            const gl::Rectangle &clearArea,
                                            gl::DrawBufferMask clearColorBuffers,
@@ -1978,6 +2031,9 @@ angle::Result FramebufferVk::clearWithDraw(ContextVk *contextVk,
                                            const VkClearColorValue &clearColorValue,
                                            const VkClearDepthStencilValue &clearDepthStencilValue)
 {
+    // All deferred clears should be handled already.
+    ASSERT(mDeferredClears.empty());
+
     UtilsVk::ClearFramebufferParameters params = {};
     params.clearArea                           = clearArea;
     params.colorClearValue                     = clearColorValue;
@@ -2055,62 +2111,64 @@ VkClearValue FramebufferVk::getCorrectedColorClearValue(size_t colorIndexGL,
     return clearValue;
 }
 
-angle::Result FramebufferVk::clearWithLoadOp(ContextVk *contextVk,
-                                             gl::DrawBufferMask clearColorBuffers,
-                                             bool clearDepth,
-                                             bool clearStencil,
-                                             const VkClearColorValue &clearColorValue,
-                                             const VkClearDepthStencilValue &clearDepthStencilValue)
+angle::Result FramebufferVk::clearWithLoadOp(ContextVk *contextVk)
 {
     // Set the appropriate loadOp and clear values for depth and stencil.
     VkImageAspectFlags dsAspectFlags = 0;
-    if (clearDepth)
+    VkClearValue dsClearValue;
+    dsClearValue.depthStencil.depth   = mDeferredClears.getDepthValue();
+    dsClearValue.depthStencil.stencil = mDeferredClears.getStencilValue();
+
+    if (mDeferredClears.testDepth())
     {
         dsAspectFlags |= VK_IMAGE_ASPECT_DEPTH_BIT;
+        mDeferredClears.reset(vk::kUnpackedDepthIndex);
     }
 
-    if (clearStencil)
+    if (mDeferredClears.testStencil())
     {
         dsAspectFlags |= VK_IMAGE_ASPECT_STENCIL_BIT;
+        mDeferredClears.reset(vk::kUnpackedStencilIndex);
     }
 
+    // If the render pass has started, modify its ops directly.  Note that the render pass should
+    // otherwise not have any commands in it.
     if (contextVk->hasStartedRenderPass())
     {
         vk::CommandBufferHelper &commands = contextVk->getStartedRenderPassCommands();
 
         ASSERT(commands.getCommandBuffer().empty());
 
+        // Go through deferred clears and update render pass loadOp and clear colors.
         vk::PackedAttachmentIndex colorIndexVk(0);
-        for (size_t colorIndexGL : mState.getColorAttachmentsMask())
+        for (size_t colorIndexGL : mDeferredClears.getColorMask())
         {
-            if (mState.getEnabledDrawBuffers()[colorIndexGL] && clearColorBuffers[colorIndexGL])
-            {
-                VkClearValue clearValue =
-                    getCorrectedColorClearValue(colorIndexGL, clearColorValue);
-                commands.updateRenderPassColorClear(colorIndexVk, clearValue);
-            }
+            ASSERT(mState.getEnabledDrawBuffers().test(colorIndexGL));
+
+            commands.updateRenderPassColorClear(colorIndexVk, mDeferredClears[colorIndexGL]);
+            mDeferredClears.reset(colorIndexGL);
             ++colorIndexVk;
         }
 
         if (dsAspectFlags)
         {
-            VkClearValue clearValue;
-            clearValue.depthStencil = clearDepthStencilValue;
-            commands.updateRenderPassDepthStencilClear(dsAspectFlags, clearValue);
+            commands.updateRenderPassDepthStencilClear(dsAspectFlags, dsClearValue);
             // If we were in depth read only mode, we must change to write mode
             updateRenderPassReadOnlyDepthMode(contextVk, &commands);
         }
     }
     else
     {
-        for (size_t colorIndexGL : clearColorBuffers)
+        // Go through deferred clears and stage the clears for future.
+        for (size_t colorIndexGL : mDeferredClears.getColorMask())
         {
             ASSERT(mState.getEnabledDrawBuffers().test(colorIndexGL));
+
             RenderTargetVk *renderTarget = getColorDrawRenderTarget(colorIndexGL);
-            VkClearValue clearValue   = getCorrectedColorClearValue(colorIndexGL, clearColorValue);
-            gl::ImageIndex imageIndex = renderTarget->getImageIndex();
+            gl::ImageIndex imageIndex    = renderTarget->getImageIndex();
             renderTarget->getImageForWrite().stageClear(imageIndex, VK_IMAGE_ASPECT_COLOR_BIT,
-                                                        clearValue);
+                                                        mDeferredClears[colorIndexGL]);
+            mDeferredClears.reset(colorIndexGL);
         }
 
         if (dsAspectFlags)
@@ -2118,55 +2176,50 @@ angle::Result FramebufferVk::clearWithLoadOp(ContextVk *contextVk,
             RenderTargetVk *renderTarget = getDepthStencilRenderTarget();
             ASSERT(renderTarget);
 
-            VkClearValue clearValue;
-            clearValue.depthStencil = clearDepthStencilValue;
-
             gl::ImageIndex imageIndex = renderTarget->getImageIndex();
-            renderTarget->getImageForWrite().stageClear(imageIndex, dsAspectFlags, clearValue);
+            renderTarget->getImageForWrite().stageClear(imageIndex, dsAspectFlags, dsClearValue);
         }
     }
     return angle::Result::Continue;
 }
 
-angle::Result FramebufferVk::clearWithCommand(
-    ContextVk *contextVk,
-    vk::CommandBufferHelper *renderpassCommands,
-    const gl::Rectangle &scissoredRenderArea,
-    gl::DrawBufferMask clearColorBuffers,
-    bool clearDepth,
-    bool clearStencil,
-    const VkClearColorValue &clearColorValue,
-    const VkClearDepthStencilValue &clearDepthStencilValue)
+angle::Result FramebufferVk::clearWithCommand(ContextVk *contextVk,
+                                              vk::CommandBufferHelper *renderpassCommands,
+                                              const gl::Rectangle &scissoredRenderArea)
 {
     gl::AttachmentVector<VkClearAttachment> attachments;
 
-    // Go through clearColorBuffers and add them to the list of attachments to clear.
-    for (size_t colorIndexGL : clearColorBuffers)
+    // Go through deferred clears and add them to the list of attachments to clear.
+    for (size_t colorIndexGL : mDeferredClears.getColorMask())
     {
         ASSERT(mState.getEnabledDrawBuffers().test(colorIndexGL));
-        VkClearValue clearValue = getCorrectedColorClearValue(colorIndexGL, clearColorValue);
-        attachments.emplace_back(VkClearAttachment{
-            VK_IMAGE_ASPECT_COLOR_BIT, static_cast<uint32_t>(colorIndexGL), clearValue});
         ASSERT(getColorDrawRenderTarget(colorIndexGL)->hasDefinedContent());
+
+        attachments.emplace_back(VkClearAttachment{VK_IMAGE_ASPECT_COLOR_BIT,
+                                                   static_cast<uint32_t>(colorIndexGL),
+                                                   mDeferredClears[colorIndexGL]});
+        mDeferredClears.reset(colorIndexGL);
     }
 
     // Add depth and stencil to list of attachments as needed.
     VkImageAspectFlags dsAspectFlags = 0;
-    VkClearValue dsClearValue        = {};
-    if (clearDepth)
+    VkClearValue dsClearValue;
+    dsClearValue.depthStencil.depth   = mDeferredClears.getDepthValue();
+    dsClearValue.depthStencil.stencil = mDeferredClears.getStencilValue();
+    if (mDeferredClears.testDepth())
     {
         dsAspectFlags |= VK_IMAGE_ASPECT_DEPTH_BIT;
-        dsClearValue.depthStencil = clearDepthStencilValue;
         // Explicitly mark a depth write because we are clearing the depth buffer.
         renderpassCommands->onDepthAccess(vk::ResourceAccess::Write);
+        mDeferredClears.reset(vk::kUnpackedDepthIndex);
     }
 
-    if (clearStencil)
+    if (mDeferredClears.testStencil())
     {
         dsAspectFlags |= VK_IMAGE_ASPECT_STENCIL_BIT;
-        dsClearValue.depthStencil = clearDepthStencilValue;
         // Explicitly mark a stencil write because we are clearing the stencil buffer.
         renderpassCommands->onStencilAccess(vk::ResourceAccess::Write);
+        mDeferredClears.reset(vk::kUnpackedStencilIndex);
     }
 
     if (dsAspectFlags != 0)

src/libANGLE/renderer/vulkan/FramebufferVk.h

@@ -172,6 +172,11 @@ class FramebufferVk : public FramebufferImpl
                             const VkClearColorValue &clearColorValue,
                             const VkClearDepthStencilValue &clearDepthStencilValue);
 
+    void mergeClearsWithDeferredClears(gl::DrawBufferMask clearColorBuffers,
+                                       bool clearDepth,
+                                       bool clearStencil,
+                                       const VkClearColorValue &clearColorValue,
+                                       const VkClearDepthStencilValue &clearDepthStencilValue);
     angle::Result clearWithDraw(ContextVk *contextVk,
                                 const gl::Rectangle &clearArea,
                                 gl::DrawBufferMask clearColorBuffers,
@@ -181,20 +186,10 @@ class FramebufferVk : public FramebufferImpl
                                 uint8_t stencilMask,
                                 const VkClearColorValue &clearColorValue,
                                 const VkClearDepthStencilValue &clearDepthStencilValue);
-    angle::Result clearWithLoadOp(ContextVk *contextVk,
-                                  gl::DrawBufferMask clearColorBuffers,
-                                  bool clearDepth,
-                                  bool clearStencil,
-                                  const VkClearColorValue &clearColorValue,
-                                  const VkClearDepthStencilValue &clearDepthStencilValue);
+    angle::Result clearWithLoadOp(ContextVk *contextVk);
     angle::Result clearWithCommand(ContextVk *contextVk,
                                    vk::CommandBufferHelper *renderpassCommands,
-                                   const gl::Rectangle &scissoredRenderArea,
-                                   gl::DrawBufferMask clearColorBuffers,
-                                   bool clearDepth,
-                                   bool clearStencil,
-                                   const VkClearColorValue &clearColorValue,
-                                   const VkClearDepthStencilValue &clearDepthStencilValue);
+                                   const gl::Rectangle &scissoredRenderArea);
     void updateActiveColorMasks(size_t colorIndex, bool r, bool g, bool b, bool a);
     void updateRenderPassDesc();
     angle::Result updateColorAttachment(const gl::Context *context,

src/libANGLE/renderer/vulkan/vk_cache_utils.h

@@ -1081,7 +1081,7 @@ class UniformsAndXfbDesc
 
 // In the FramebufferDesc object:
 //  - Depth/stencil serial is at index 0
-//  - Color serials are at indices [1:gl::IMPLEMENTATION_MAX_DRAW_BUFFERS]
+//  - Color serials are at indices [1, gl::IMPLEMENTATION_MAX_DRAW_BUFFERS]
 //  - Depth/stencil resolve attachment is at index gl::IMPLEMENTATION_MAX_DRAW_BUFFERS+1
 //  - Resolve attachments are at indices [gl::IMPLEMENTATION_MAX_DRAW_BUFFERS+2,
 //                                        gl::IMPLEMENTATION_MAX_DRAW_BUFFERS*2+1]

src/libANGLE/renderer/vulkan/vk_utils.cpp

@@ -757,6 +757,13 @@ void ClearValuesArray::storeNoDepthStencil(uint32_t index, const VkClearValue &c
     mEnabled.set(index);
 }
 
+gl::DrawBufferMask ClearValuesArray::getColorMask() const
+{
+    constexpr uint32_t kColorBuffersMask =
+        angle::Bit<uint32_t>(gl::IMPLEMENTATION_MAX_DRAW_BUFFERS) - 1;
+    return gl::DrawBufferMask(mEnabled.bits() & kColorBuffersMask);
+}
+
 // ResourceSerialFactory implementation.
 ResourceSerialFactory::ResourceSerialFactory() : mCurrentUniqueSerial(1) {}
 

src/libANGLE/renderer/vulkan/vk_utils.h

@@ -711,6 +711,7 @@ class ClearValuesArray final
     bool test(size_t index) const { return mEnabled.test(index); }
     bool testDepth() const { return mEnabled.test(kUnpackedDepthIndex); }
     bool testStencil() const { return mEnabled.test(kUnpackedStencilIndex); }
+    gl::DrawBufferMask getColorMask() const;
 
     const VkClearValue &operator[](size_t index) const { return mValues[index]; }
 

src/tests/gl_tests/ClearTest.cpp

@@ -1897,6 +1897,81 @@ TEST_P(ClearTestES3, ClearMaxAttachmentsAfterDraw)
     EXPECT_PIXEL_COLOR_EQ(kSize - 1, kSize - 1, GLColor::green);
 }
 
+// Test that mixed masked clear works after clear.
+TEST_P(ClearTestES3, ClearThenMixedMaskedClear)
+{
+    constexpr GLsizei kSize = 16;
+
+    GLint maxDrawBuffers = 0;
+    glGetIntegerv(GL_MAX_DRAW_BUFFERS, &maxDrawBuffers);
+    ASSERT_GE(maxDrawBuffers, 4);
+
+    // Setup framebuffer.
+    GLRenderbuffer color;
+
+    glBindRenderbuffer(GL_RENDERBUFFER, color);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, kSize, kSize);
+
+    GLRenderbuffer depthStencil;
+    glBindRenderbuffer(GL_RENDERBUFFER, depthStencil);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, kSize, kSize);
+
+    GLFramebuffer fb;
+    glBindFramebuffer(GL_FRAMEBUFFER, fb);
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, color);
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER,
+                              depthStencil);
+    EXPECT_GL_NO_ERROR();
+    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);
+
+    // Clear color and depth/stencil
+    glClearColor(0.1f, 1.0f, 0.0f, 0.7f);
+    glClearDepthf(0.0f);
+    glClearStencil(0x55);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+    // Clear again, but with color and stencil masked
+    glClearColor(1.0f, 0.2f, 0.6f, 1.0f);
+    glClearDepthf(1.0f);
+    glClearStencil(0x3C);
+    glColorMask(GL_TRUE, GL_FALSE, GL_FALSE, GL_TRUE);
+    glStencilMask(0xF0);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+    // Issue a draw call to verify color, depth and stencil.
+
+    // If depth is not cleared to 1, rendering would fail.
+    glEnable(GL_DEPTH_TEST);
+    glDepthFunc(GL_LESS);
+
+    // If stencil is not cleared to 0x35, rendering would fail.
+    glEnable(GL_STENCIL_TEST);
+    glStencilFunc(GL_EQUAL, 0x35, 0xFF);
+    glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+    glStencilMask(0xFF);
+    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+
+    ANGLE_GL_PROGRAM(drawColor, essl1_shaders::vs::Simple(), essl1_shaders::fs::UniformColor());
+    glUseProgram(drawColor);
+    GLint colorUniformLocation =
+        glGetUniformLocation(drawColor, angle::essl1_shaders::ColorUniform());
+    ASSERT_NE(colorUniformLocation, -1);
+
+    // Blend half-transparent blue into the color buffer.
+    glUniform4f(colorUniformLocation, 0.0f, 0.0f, 1.0f, 0.5f);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    drawQuad(drawColor, essl1_shaders::PositionAttrib(), 0.95f);
+    ASSERT_GL_NO_ERROR();
+
+    // Verify that the color buffer is now gray
+    const GLColor kExpected(127, 127, 127, 191);
+    EXPECT_PIXEL_COLOR_NEAR(0, 0, kExpected, 1);
+    EXPECT_PIXEL_COLOR_NEAR(0, kSize - 1, kExpected, 1);
+    EXPECT_PIXEL_COLOR_NEAR(kSize - 1, 0, kExpected, 1);
+    EXPECT_PIXEL_COLOR_NEAR(kSize - 1, kSize - 1, kExpected, 1);
+}
+
 #ifdef Bool
 // X11 craziness.
 #    undef Bool

src/tests/gl_tests/VulkanPerformanceCounterTest.cpp

@@ -2366,6 +2366,154 @@ TEST_P(VulkanPerformanceCounterTest, ReadOnlyDepthBufferLayout)
     EXPECT_EQ(expectedReadOnlyDepthStencilCount, actualReadOnlyDepthStencilCount);
 }
 
+// Ensures repeated clears of various kind (all attachments, some attachments, scissored, masked
+// etc) don't break the render pass.
+TEST_P(VulkanPerformanceCounterTest, ClearAfterClearDoesNotBreakRenderPass)
+{
+    const rx::vk::PerfCounters &counters = hackANGLE();
+    uint32_t expectedRenderPassCount     = counters.renderPasses + 1;
+
+    GLFramebuffer FBO;
+    glBindFramebuffer(GL_FRAMEBUFFER, FBO);
+
+    constexpr GLsizei kSize = 6;
+
+    // Create a framebuffer to clear with both color and depth/stencil attachments.
+    GLTexture color;
+    glBindTexture(GL_TEXTURE_2D, color);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
+
+    GLTexture depth;
+    glBindTexture(GL_TEXTURE_2D, depth);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH24_STENCIL8, kSize, kSize, 0, GL_DEPTH_STENCIL,
+                 GL_UNSIGNED_INT_24_8_OES, nullptr);
+
+    GLFramebuffer fbo;
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, color, 0);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_TEXTURE_2D, depth, 0);
+    ASSERT_GL_NO_ERROR();
+
+    // Clear color and depth, but not stencil.
+    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+    glClearDepthf(0.0f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    // Clear color and stencil, but not depth.
+    glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
+    glClearStencil(0x11);
+    glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+    // Clear depth and stencil, but not color.
+    glClearDepthf(0.1f);
+    glClearStencil(0x22);
+    glClear(GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+    // Clear masked color, and unmasked depth.
+    glClearDepthf(0.2f);
+    glClearColor(0.1f, 1.0f, 0.0f, 1.0f);
+    glColorMask(GL_FALSE, GL_TRUE, GL_FALSE, GL_FALSE);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    // Clear unmasked color, and masked stencil.
+    glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
+    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+    glClearStencil(0x33);
+    glStencilMask(0xF0);
+    glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+    // Clear unmasked depth and stencil.
+    glClearDepthf(0.3f);
+    glClearStencil(0x44);
+    glStencilMask(0xFF);
+    glClear(GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+    // Clear with scissor.
+    glEnable(GL_SCISSOR_TEST);
+    glScissor(kSize / 3, kSize / 3, kSize / 3, kSize / 3);
+    glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
+    glClearDepthf(1.0f);
+    glClearStencil(0x55);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+    // Verify render pass count.
+    EXPECT_EQ(counters.renderPasses, expectedRenderPassCount);
+
+    // Make sure the result is correct.  The border of the image should be blue with depth 0.3f and
+    // stencil 0x44.  The center is red with depth 1.0f and stencil 0x55.
+
+    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::blue);
+    EXPECT_PIXEL_COLOR_EQ(kSize - 1, 0, GLColor::blue);
+    EXPECT_PIXEL_COLOR_EQ(0, kSize - 1, GLColor::blue);
+    EXPECT_PIXEL_COLOR_EQ(kSize - 1, kSize - 1, GLColor::blue);
+
+    EXPECT_PIXEL_COLOR_EQ(kSize / 3, kSize / 3, GLColor::red);
+    EXPECT_PIXEL_COLOR_EQ(2 * kSize / 3 - 1, kSize / 3, GLColor::red);
+    EXPECT_PIXEL_COLOR_EQ(kSize / 3, 2 * kSize / 3 - 1, GLColor::red);
+    EXPECT_PIXEL_COLOR_EQ(2 * kSize / 3 - 1, 2 * kSize / 3 - 1, GLColor::red);
+    EXPECT_PIXEL_COLOR_EQ(kSize / 2, kSize / 2, GLColor::red);
+
+    glViewport(0, 0, kSize, kSize);
+    glDisable(GL_SCISSOR_TEST);
+
+    // Center: If depth is not cleared to 1, rendering would fail.
+    glEnable(GL_DEPTH_TEST);
+    glDepthFunc(GL_LESS);
+
+    // Center: If stencil is not clear to 0x55, rendering would fail.
+    glEnable(GL_STENCIL_TEST);
+    glStencilFunc(GL_EQUAL, 0x55, 0xFF);
+    glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+    glStencilMask(0xFF);
+
+    // Set up program
+    ANGLE_GL_PROGRAM(drawColor, essl1_shaders::vs::Simple(), essl1_shaders::fs::UniformColor());
+    glUseProgram(drawColor);
+    GLint colorUniformLocation =
+        glGetUniformLocation(drawColor, angle::essl1_shaders::ColorUniform());
+    ASSERT_NE(colorUniformLocation, -1);
+
+    // Draw green
+    glUniform4f(colorUniformLocation, 0.0f, 1.0f, 0.0f, 1.0f);
+    drawQuad(drawColor, essl1_shaders::PositionAttrib(), 0.95f);
+    ASSERT_GL_NO_ERROR();
+
+    // Verify that only the center has changed
+    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::blue);
+    EXPECT_PIXEL_COLOR_EQ(kSize - 1, 0, GLColor::blue);
+    EXPECT_PIXEL_COLOR_EQ(0, kSize - 1, GLColor::blue);
+    EXPECT_PIXEL_COLOR_EQ(kSize - 1, kSize - 1, GLColor::blue);
+
+    EXPECT_PIXEL_COLOR_EQ(kSize / 3, kSize / 3, GLColor::green);
+    EXPECT_PIXEL_COLOR_EQ(2 * kSize / 3 - 1, kSize / 3, GLColor::green);
+    EXPECT_PIXEL_COLOR_EQ(kSize / 3, 2 * kSize / 3 - 1, GLColor::green);
+    EXPECT_PIXEL_COLOR_EQ(2 * kSize / 3 - 1, 2 * kSize / 3 - 1, GLColor::green);
+    EXPECT_PIXEL_COLOR_EQ(kSize / 2, kSize / 2, GLColor::green);
+
+    // Border: If depth is not cleared to 0.3f, rendering would fail.
+    glDepthFunc(GL_LESS);
+
+    // Center: If stencil is not clear to 0x44, rendering would fail.
+    glStencilFunc(GL_EQUAL, 0x44, 0xFF);
+
+    // Draw yellow
+    glUniform4f(colorUniformLocation, 1.0f, 1.0f, 0.0f, 1.0f);
+    drawQuad(drawColor, essl1_shaders::PositionAttrib(), -0.5f);
+    ASSERT_GL_NO_ERROR();
+
+    // Verify that only the border has changed
+    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::yellow);
+    EXPECT_PIXEL_COLOR_EQ(kSize - 1, 0, GLColor::yellow);
+    EXPECT_PIXEL_COLOR_EQ(0, kSize - 1, GLColor::yellow);
+    EXPECT_PIXEL_COLOR_EQ(kSize - 1, kSize - 1, GLColor::yellow);
+
+    EXPECT_PIXEL_COLOR_EQ(kSize / 3, kSize / 3, GLColor::green);
+    EXPECT_PIXEL_COLOR_EQ(2 * kSize / 3 - 1, kSize / 3, GLColor::green);
+    EXPECT_PIXEL_COLOR_EQ(kSize / 3, 2 * kSize / 3 - 1, GLColor::green);
+    EXPECT_PIXEL_COLOR_EQ(2 * kSize / 3 - 1, 2 * kSize / 3 - 1, GLColor::green);
+    EXPECT_PIXEL_COLOR_EQ(kSize / 2, kSize / 2, GLColor::green);
+}
+
 ANGLE_INSTANTIATE_TEST(VulkanPerformanceCounterTest, ES3_VULKAN());
 ANGLE_INSTANTIATE_TEST(VulkanPerformanceCounterTest_ES31, ES31_VULKAN());