D3D11: Skip blits if there is no intersection of dest areas

src/libANGLE/angletypes.h

@@ -90,7 +90,9 @@ enum class ClipSpaceOrigin
 };
 
 // Calculate the intersection of two rectangles.  Returns false if the intersection is empty.
-bool ClipRectangle(const Rectangle &source, const Rectangle &clip, Rectangle *intersection);
+ANGLE_NO_DISCARD bool ClipRectangle(const Rectangle &source,
+                                    const Rectangle &clip,
+                                    Rectangle *intersection);
 // Calculate the smallest rectangle that covers both rectangles.  This rectangle may cover areas
 // not covered by the two rectangles, for example in this situation:
 //

src/libANGLE/renderer/d3d/d3d11/Blit11.cpp

@@ -141,7 +141,10 @@ void StretchedBlitNearest(const gl::Box &sourceArea,
                           uint8_t *destData)
 {
     gl::Rectangle clippedDestArea(destArea.x, destArea.y, destArea.width, destArea.height);
-    gl::ClipRectangle(clippedDestArea, clipRect, &clippedDestArea);
+    if (!gl::ClipRectangle(clippedDestArea, clipRect, &clippedDestArea))
+    {
+        return;
+    }
 
     // Determine if entire rows can be copied at once instead of each individual pixel. There
     // must be no out of bounds lookups, whole rows copies, and no scale.

src/libANGLE/renderer/gl/FramebufferGL.cpp

@@ -1120,7 +1120,10 @@ angle::Result FramebufferGL::clipSrcRegion(const gl::Context *context,
         // If pixels lying outside the read framebuffer, adjust src region
         // and dst region to appropriate in-bounds regions respectively.
         gl::Rectangle realSourceRegion;
-        ClipRectangle(bounds.sourceRegion, bounds.sourceBounds, &realSourceRegion);
+        if (!ClipRectangle(bounds.sourceRegion, bounds.sourceBounds, &realSourceRegion))
+        {
+            return angle::Result::Stop;
+        }
         GLuint xOffset = realSourceRegion.x - bounds.sourceRegion.x;
         GLuint yOffset = realSourceRegion.y - bounds.sourceRegion.y;
 

src/libANGLE/renderer/metal/ContextMtl.mm

@@ -1625,7 +1625,10 @@ void ContextMtl::updateScissor(const gl::State &glState)
 
     // Clip the render area to the viewport.
     gl::Rectangle viewportClippedRenderArea;
-    gl::ClipRectangle(renderArea, glState.getViewport(), &viewportClippedRenderArea);
+    if (!gl::ClipRectangle(renderArea, glState.getViewport(), &viewportClippedRenderArea))
+    {
+        viewportClippedRenderArea = gl::Rectangle();
+    }
 
     gl::Rectangle scissoredArea = ClipRectToScissor(getState(), viewportClippedRenderArea, false);
     if (framebufferMtl->flipY())

src/libANGLE/renderer/vulkan/ContextVk.cpp

@@ -2926,8 +2926,11 @@ void ContextVk::updateScissor(const gl::State &glState)
 
     // Clip the render area to the viewport.
     gl::Rectangle viewportClippedRenderArea;
-    gl::ClipRectangle(renderArea, getCorrectedViewport(glState.getViewport()),
-                      &viewportClippedRenderArea);
+    if (!gl::ClipRectangle(renderArea, getCorrectedViewport(glState.getViewport()),
+                           &viewportClippedRenderArea))
+    {
+        viewportClippedRenderArea = gl::Rectangle();
+    }
 
     gl::Rectangle scissoredArea = ClipRectToScissor(getState(), viewportClippedRenderArea, false);
     gl::Rectangle rotatedScissoredArea;

src/tests/gl_tests/BlitFramebufferANGLETest.cpp

@@ -2524,6 +2524,30 @@ TEST_P(BlitFramebufferTest, BlitFramebufferSizeOverflow2)
     EXPECT_GL_ERROR(GL_INVALID_VALUE);
 }
 
+// Test an edge case in D3D11 stencil blitting on the CPU that does not properly clip the
+// destination regions
+TEST_P(BlitFramebufferTest, BlitFramebufferStencilClipNoIntersection)
+{
+    GLFramebuffer framebuffers[2];
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, framebuffers[0]);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, framebuffers[1]);
+
+    GLRenderbuffer renderbuffers[2];
+    glBindRenderbuffer(GL_RENDERBUFFER, renderbuffers[0]);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, 4, 4);
+    glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER,
+                              renderbuffers[0]);
+
+    glBindRenderbuffer(GL_RENDERBUFFER, renderbuffers[1]);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, 4, 4);
+    glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER,
+                              renderbuffers[1]);
+
+    glBlitFramebuffer(0, 0, 4, 4, 1 << 24, 1 << 24, 1 << 25, 1 << 25, GL_STENCIL_BUFFER_BIT,
+                      GL_NEAREST);
+    EXPECT_GL_NO_ERROR();
+}
+
 // Use this to select which configurations (e.g. which renderer, which GLES major version) these
 // tests should be run against.
 GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(BlitFramebufferANGLETest);