chromium/third_party/angle/src/tests/gl_tests/FramebufferMixedSamplesTest.cpp

//
// Copyright 2016 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// CHROMIUMFramebufferMixedSamplesTest
//   Test CHROMIUM subset of NV_framebuffer_mixed_samples.
//   This extension allows rendering to a framebuffer that has different
//   sample counts for different render buffers (stencil, depth, color)

#include "test_utils/ANGLETest.h"

usingnamespaceangle;

namespace
{

const GLuint kWidth  = …;
const GLuint kHeight = …;

class CHROMIUMFramebufferMixedSamplesTest : public ANGLETest<>
{ … };

}  // namespace

TEST_P(CHROMIUMFramebufferMixedSamplesTest, StateSettingTest)
{ … }

// The test pattern is as follows:
// A green triangle (bottom left, top right, top left).
// A blue triangle (top left, bottom right, bottom left).
// The triangles will overlap but overlap only contains green pixels,
// due to each draw erasing its area from stencil.
// The blue triangle will fill only the area (bottom left, center,
// bottom right).

// The test tests that CoverageModulation call works.
// The fractional pixels of both triangles end up being modulated
// by the coverage of the fragment. Test that drawing with and without
// CoverageModulation causes the result to be different.
TEST_P(CHROMIUMFramebufferMixedSamplesTest, CoverageModulation)
{ … }

// The test tests that the stencil buffer can be multisampled, even though the
// color buffer is single-sampled. Draws the same pattern with single-sample
// stencil buffer and with multisample stencil buffer. The images should differ.
TEST_P(CHROMIUMFramebufferMixedSamplesTest, MultisampleStencilEffective)
{ … }

ANGLE_INSTANTIATE_TEST_ES2(…);