Vulkan: Don't break the RP on masked/scissored clears

Bug: b/166809097
Change-Id: Iedd10a6528808e859c5693a2d30c98aca1a1159c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2390862
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Charlie Lao <cclao@google.com>
Reviewed-by: Tim Van Patten <timvp@google.com>

src/libANGLE/renderer/vulkan/FramebufferVk.cpp

@@ -1999,6 +1999,10 @@ angle::Result FramebufferVk::clearWithDraw(ContextVk *contextVk,
 
         // Scissored-only clears are handled in clearImmediatelyWithRenderPassOp.
         ASSERT(clearColorBuffers.any() || clearStencil);
+
+        // Force start a new render pass for the depth clear to take effect.
+        // UtilsVk::clearFramebuffer may not start a new render pass if there's one already started.
+        ANGLE_TRY(flushDeferredClears(contextVk, clearArea));
     }
 
     UtilsVk::ClearFramebufferParameters params = {};

src/libANGLE/renderer/vulkan/UtilsVk.cpp

@@ -1142,9 +1142,19 @@ angle::Result UtilsVk::clearFramebuffer(ContextVk *contextVk,
     ANGLE_TRY(ensureImageClearResourcesInitialized(contextVk));
 
     const gl::Rectangle &scissoredRenderArea = params.clearArea;
-
+    vk::Framebuffer *currentFramebuffer      = nullptr;
     vk::CommandBuffer *commandBuffer;
-    ANGLE_TRY(contextVk->startRenderPass(scissoredRenderArea, &commandBuffer));
+
+    // Start a new render pass if not already started
+    ANGLE_TRY(framebuffer->getFramebuffer(contextVk, &currentFramebuffer, nullptr));
+    if (contextVk->hasStartedRenderPassWithFramebuffer(currentFramebuffer))
+    {
+        commandBuffer = &contextVk->getStartedRenderPassCommands().getCommandBuffer();
+    }
+    else
+    {
+        ANGLE_TRY(contextVk->startRenderPass(scissoredRenderArea, &commandBuffer));
+    }
 
     ImageClearShaderParams shaderParams;
     shaderParams.clearValue = params.colorClearValue;

src/tests/gl_tests/VulkanPerformanceCounterTest.cpp

@@ -499,6 +499,46 @@ TEST_P(VulkanPerformanceCounterTest, SwapShouldInvalidateDepthAfterClear)
     EXPECT_EQ(expectedDepthClears, actualDepthClears);
 }
 
+// Tests that masked color clears don't break the RP.
+TEST_P(VulkanPerformanceCounterTest, MaskedClearDoesNotBreakRenderPass)
+{
+    const rx::vk::PerfCounters &counters = hackANGLE();
+
+    GLTexture texture;
+    glBindTexture(GL_TEXTURE_2D, texture);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
+
+    GLFramebuffer framebuffer;
+    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
+    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);
+    ASSERT_GL_NO_ERROR();
+
+    uint32_t expectedRenderPassCount = counters.renderPasses + 1;
+
+    // Mask color channels and clear the framebuffer multiple times.
+    glClearColor(0.25f, 0.25f, 0.25f, 0.25f);
+    glColorMask(GL_TRUE, GL_FALSE, GL_FALSE, GL_FALSE);
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    glClearColor(0.5f, 0.5f, 0.5f, 0.5f);
+    glColorMask(GL_FALSE, GL_TRUE, GL_FALSE, GL_FALSE);
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
+    glColorMask(GL_FALSE, GL_FALSE, GL_TRUE, GL_FALSE);
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    glClearColor(0.75f, 0.75f, 0.75f, 0.75f);
+    glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE);
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    uint32_t actualRenderPassCount = counters.renderPasses;
+    EXPECT_EQ(expectedRenderPassCount, actualRenderPassCount);
+
+    EXPECT_PIXEL_NEAR(0, 0, 63, 127, 255, 191, 1);
+}
+
 ANGLE_INSTANTIATE_TEST(VulkanPerformanceCounterTest, ES3_VULKAN());
 ANGLE_INSTANTIATE_TEST(VulkanPerformanceCounterTest_ES31, ES31_VULKAN());