src/tests/gl_tests/FramebufferMultiviewTest.cpp

//
// Copyright 2017 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.
//
// Framebuffer multiview tests:
// The tests modify and examine the multiview state.
//

#include "test_utils/ANGLETest.h"

using namespace angle;

class FramebufferMultiviewTest : public ANGLETest
{
  protected:
    FramebufferMultiviewTest() : mFramebuffer(0), mTexture(0)
    {
        setWindowWidth(128);
        setWindowHeight(128);
        setWebGLCompatibilityEnabled(true);
    }

    void SetUp() override
    {
        ANGLETest::SetUp();

        glGenFramebuffers(1, &mFramebuffer);
        glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer);

        glGenTextures(1, &mTexture);
        glBindTexture(GL_TEXTURE_2D, mTexture);
        glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA16F, 1, 1);
        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mTexture, 0);

        glRequestExtensionANGLE = reinterpret_cast<PFNGLREQUESTEXTENSIONANGLEPROC>(
            eglGetProcAddress("glRequestExtensionANGLE"));
    }

    void TearDown() override
    {
        if (mTexture != 0)
        {
            glDeleteTextures(1, &mTexture);
            mTexture = 0;
        }

        if (mFramebuffer != 0)
        {
            glDeleteFramebuffers(1, &mFramebuffer);
            mFramebuffer = 0;
        }

        ANGLETest::TearDown();
    }

    GLuint mFramebuffer;
    GLuint mTexture;
    PFNGLREQUESTEXTENSIONANGLEPROC glRequestExtensionANGLE = nullptr;
};

// Test that the framebuffer tokens introduced by ANGLE_multiview can be used query the framebuffer
// state and that their corresponding default values are correctly set.
TEST_P(FramebufferMultiviewTest, DefaultState)
{
    if (extensionRequestable("GL_ANGLE_multiview"))
    {
        glRequestExtensionANGLE("GL_ANGLE_multiview");
    }

    if (!extensionEnabled("GL_ANGLE_multiview"))
    {
        std::cout << "Test skipped due to missing GL_ANGLE_multiview." << std::endl;
        return;
    }

    GLint numViews = -1;
    glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                                          GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_NUM_VIEWS_ANGLE,
                                          &numViews);
    EXPECT_GL_NO_ERROR();
    EXPECT_EQ(1, numViews);

    GLint baseViewIndex = -1;
    glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                                          GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_BASE_VIEW_INDEX_ANGLE,
                                          &baseViewIndex);
    EXPECT_GL_NO_ERROR();
    EXPECT_EQ(0, baseViewIndex);

    GLint multiviewLayout = GL_FRAMEBUFFER_MULTIVIEW_SIDE_BY_SIDE_ANGLE;
    glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                                          GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_MULTIVIEW_LAYOUT_ANGLE,
                                          &multiviewLayout);
    EXPECT_GL_NO_ERROR();
    EXPECT_EQ(GL_NONE, multiviewLayout);

    GLint viewportOffsets[2] = {-1, -1};
    glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                                          GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_VIEWPORT_OFFSETS_ANGLE,
                                          &viewportOffsets[0]);
    EXPECT_GL_NO_ERROR();
    EXPECT_EQ(0, viewportOffsets[0]);
    EXPECT_EQ(0, viewportOffsets[1]);
}

// Test that without having the ANGLE_multiview extension, querying for the framebuffer state using
// the ANGLE_multiview tokens results in an INVALID_ENUM error.
TEST_P(FramebufferMultiviewTest, NegativeFramebufferStateQueries)
{
    GLint numViews = -1;
    glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                                          GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_NUM_VIEWS_ANGLE,
                                          &numViews);
    EXPECT_GL_ERROR(GL_INVALID_ENUM);

    GLint baseViewIndex = -1;
    glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                                          GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_BASE_VIEW_INDEX_ANGLE,
                                          &baseViewIndex);
    EXPECT_GL_ERROR(GL_INVALID_ENUM);

    GLint multiviewLayout = GL_FRAMEBUFFER_MULTIVIEW_SIDE_BY_SIDE_ANGLE;
    glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                                          GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_MULTIVIEW_LAYOUT_ANGLE,
                                          &multiviewLayout);
    EXPECT_GL_ERROR(GL_INVALID_ENUM);

    GLint viewportOffsets[2] = {-1, -1};
    glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                                          GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_VIEWPORT_OFFSETS_ANGLE,
                                          &viewportOffsets[0]);
    EXPECT_GL_ERROR(GL_INVALID_ENUM);
}

ANGLE_INSTANTIATE_TEST(FramebufferMultiviewTest, ES3_OPENGL());