EGL: Add stencil8 to configs

Add stencil8 option to Depth and Stencil of configs based on
support of stencil8 format from GLES.
Add stencil8 to configs
Adjust dEQP-EGL expectations
Unblocks dEQP-EGL.functional.*.*_no_depth_stencil tests
Test: angle_deqp_egl_tests

Bug: angleproject:3231
Change-Id: I57d7085a71a5b0dc45803351c9116a1694668852
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2430191
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

src/libANGLE/Caps.cpp

@@ -791,6 +791,16 @@ bool DetermineCompressedTextureETCSupport(const TextureCapsMap &textureCaps)
     return GetFormatSupport(textureCaps, requiredFormats, true, true, false, false, false);
 }
 
+// Checks for GL_OES_texture_stencil8 support
+static bool DetermineStencilIndex8Support(const TextureCapsMap &textureCaps)
+{
+    constexpr GLenum requiredFormats[] = {
+        GL_STENCIL_INDEX8,
+    };
+
+    return GetFormatSupport(textureCaps, requiredFormats, false, false, true, false, false);
+}
+
 void Extensions::setTextureExtensionSupport(const TextureCapsMap &textureCaps)
 {
     // TODO(ynovikov): rgb8rgba8OES, colorBufferHalfFloat, textureHalfFloat, textureHalfFloatLinear,
@@ -844,6 +854,7 @@ void Extensions::setTextureExtensionSupport(const TextureCapsMap &textureCaps)
     textureCompressionBPTC              = DetermineBPTCTextureSupport(textureCaps);
     compressedTexturePVRTC              = DeterminePVRTCTextureSupport(textureCaps);
     compressedTexturePVRTCsRGB          = DeterminePVRTCsRGBTextureSupport(textureCaps);
+    stencilIndex8                       = DetermineStencilIndex8Support(textureCaps);
 }
 
 const ExtensionInfoMap &GetExtensionInfoMap()

src/libANGLE/Caps.h

@@ -647,6 +647,9 @@ struct Extensions
 
     // GL_EXT_buffer_storage
     bool bufferStorageEXT = false;
+
+    // GL_OES_texture_stencil8
+    bool stencilIndex8 = false;
 };
 
 // Pointer to a boolean memeber of the Extensions struct
@@ -892,6 +895,9 @@ struct Caps
 
     // Support for NPOT surfaces
     bool textureNPOT;
+
+    // Support for Stencil8 configs
+    bool stencil8;
 };
 
 struct DisplayExtensions

src/libANGLE/renderer/vulkan/DisplayVk.cpp

@@ -241,6 +241,7 @@ void DisplayVk::generateExtensions(egl::DisplayExtensions *outExtensions) const
 void DisplayVk::generateCaps(egl::Caps *outCaps) const
 {
     outCaps->textureNPOT = true;
+    outCaps->stencil8    = getRenderer()->getNativeExtensions().stencilIndex8;
 }
 
 const char *DisplayVk::getWSILayer() const

src/libANGLE/renderer/vulkan/android/DisplayVkAndroid.cpp

@@ -51,8 +51,18 @@ egl::ConfigSet DisplayVkAndroid::generateConfigs()
 {
     // TODO (Issue 4062): Add conditional support for GL_RGB10_A2 and GL_RGBA16F when the
     // Android Vulkan loader adds conditional support for them.
-    constexpr GLenum kColorFormats[] = {GL_RGBA8, GL_RGB8, GL_RGB565};
+    const std::array<GLenum, 3> kColorFormats = {GL_RGBA8, GL_RGB8, GL_RGB565};
-    return egl_vk::GenerateConfigs(kColorFormats, egl_vk::kConfigDepthStencilFormats, this);
+
+    std::vector<GLenum> depthStencilFormats(
+        egl_vk::kConfigDepthStencilFormats,
+        egl_vk::kConfigDepthStencilFormats + ArraySize(egl_vk::kConfigDepthStencilFormats));
+
+    if (getCaps().stencil8)
+    {
+        depthStencilFormats.push_back(GL_STENCIL_INDEX8);
+    }
+    return egl_vk::GenerateConfigs(kColorFormats.data(), kColorFormats.size(),
+                                   depthStencilFormats.data(), depthStencilFormats.size(), this);
 }
 
 void DisplayVkAndroid::checkConfigSupport(egl::Config *config)

src/libANGLE/renderer/vulkan/win32/DisplayVkWin32.cpp

@@ -134,9 +134,19 @@ egl::Error DisplayVkWin32::initialize(egl::Display *display)
 
 egl::ConfigSet DisplayVkWin32::generateConfigs()
 {
-    constexpr GLenum kColorFormats[] = {GL_RGB565, GL_BGRA8_EXT, GL_BGRX8_ANGLEX, GL_RGB10_A2_EXT,
+    const std::array<GLenum, 5> kColorFormats = {GL_RGB565, GL_BGRA8_EXT, GL_BGRX8_ANGLEX,
-                                        GL_RGBA16F_EXT};
+                                                 GL_RGB10_A2_EXT, GL_RGBA16F_EXT};
-    return egl_vk::GenerateConfigs(kColorFormats, egl_vk::kConfigDepthStencilFormats, this);
+
+    std::vector<GLenum> depthStencilFormats(
+        egl_vk::kConfigDepthStencilFormats,
+        egl_vk::kConfigDepthStencilFormats + ArraySize(egl_vk::kConfigDepthStencilFormats));
+
+    if (getCaps().stencil8)
+    {
+        depthStencilFormats.push_back(GL_STENCIL_INDEX8);
+    }
+    return egl_vk::GenerateConfigs(kColorFormats.data(), kColorFormats.size(),
+                                   depthStencilFormats.data(), depthStencilFormats.size(), this);
 }
 
 void DisplayVkWin32::checkConfigSupport(egl::Config *config)

src/libANGLE/renderer/vulkan/xcb/DisplayVkXcb.cpp

@@ -87,8 +87,18 @@ SurfaceImpl *DisplayVkXcb::createWindowSurfaceVk(const egl::SurfaceState &state,
 
 egl::ConfigSet DisplayVkXcb::generateConfigs()
 {
-    constexpr GLenum kColorFormats[] = {GL_BGRA8_EXT};
+    const std::array<GLenum, 1> kColorFormats = {GL_BGRA8_EXT};
-    return egl_vk::GenerateConfigs(kColorFormats, egl_vk::kConfigDepthStencilFormats, this);
+
+    std::vector<GLenum> depthStencilFormats(
+        egl_vk::kConfigDepthStencilFormats,
+        egl_vk::kConfigDepthStencilFormats + ArraySize(egl_vk::kConfigDepthStencilFormats));
+
+    if (getCaps().stencil8)
+    {
+        depthStencilFormats.push_back(GL_STENCIL_INDEX8);
+    }
+    return egl_vk::GenerateConfigs(kColorFormats.data(), kColorFormats.size(),
+                                   depthStencilFormats.data(), depthStencilFormats.size(), this);
 }
 
 void DisplayVkXcb::checkConfigSupport(egl::Config *config)