FramebufferTest.cpp

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Author : Tim Van Patten
Date : 2019-07-08 15:11:59
Hash : 626a7280
Message : Vulkan: Implement framebuffers without attachments It is possible to render to a framebuffer object that has no attachments. However, the rasterization of primitives is always based on the area and characteristics of the bound framebuffer. These characteristics (size, number of samples, etc.) would normally be defined by the attached images. If no images are attached, these characteristics are defined by their default values. Bug: angleproject:3579 Test: dEQP-GLES31.functional.fbo.*no_attachments* Test: dEQP-GLES31.functional.state_query.framebuffer_default.* Change-Id: I9580b924ac810db573cd8df96273fbb01bbb1f73 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1690688 Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com> Commit-Queue: Tim Van Patten <timvp@google.com>
src/tests/gl_tests/FramebufferTest.cpp
//
// Copyright 2015 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 tests:
//   Various tests related for Frambuffers.
//

#include "platform/FeaturesD3D.h"
#include "test_utils/ANGLETest.h"
#include "test_utils/gl_raii.h"

using namespace angle;

namespace
{

void ExpectFramebufferCompleteOrUnsupported(GLenum binding)
{
    GLenum status = glCheckFramebufferStatus(binding);
    EXPECT_TRUE(status == GL_FRAMEBUFFER_COMPLETE || status == GL_FRAMEBUFFER_UNSUPPORTED);
}

}  // anonymous namespace

class FramebufferFormatsTest : public ANGLETest
{
  protected:
    FramebufferFormatsTest() : mFramebuffer(0), mTexture(0), mRenderbuffer(0), mProgram(0)
    {
        setWindowWidth(128);
        setWindowHeight(128);
        setConfigRedBits(8);
        setConfigGreenBits(8);
        setConfigBlueBits(8);
        setConfigAlphaBits(8);
    }

    void checkBitCount(GLuint fbo, GLenum channel, GLint minBits)
    {
        glBindFramebuffer(GL_FRAMEBUFFER, fbo);

        GLint bits = 0;
        glGetIntegerv(channel, &bits);

        if (minBits == 0)
        {
            EXPECT_EQ(minBits, bits);
        }
        else
        {
            EXPECT_GE(bits, minBits);
        }
    }

    void testBitCounts(GLuint fbo,
                       GLint minRedBits,
                       GLint minGreenBits,
                       GLint minBlueBits,
                       GLint minAlphaBits,
                       GLint minDepthBits,
                       GLint minStencilBits)
    {
        checkBitCount(fbo, GL_RED_BITS, minRedBits);
        checkBitCount(fbo, GL_GREEN_BITS, minGreenBits);
        checkBitCount(fbo, GL_BLUE_BITS, minBlueBits);
        checkBitCount(fbo, GL_ALPHA_BITS, minAlphaBits);
        checkBitCount(fbo, GL_DEPTH_BITS, minDepthBits);
        checkBitCount(fbo, GL_STENCIL_BITS, minStencilBits);
    }

    void testTextureFormat(GLenum internalFormat,
                           GLint minRedBits,
                           GLint minGreenBits,
                           GLint minBlueBits,
                           GLint minAlphaBits)
    {
        glGenTextures(1, &mTexture);
        glBindTexture(GL_TEXTURE_2D, mTexture);

        if (getClientMajorVersion() >= 3)
        {
            glTexStorage2D(GL_TEXTURE_2D, 1, internalFormat, 1, 1);
        }
        else
        {
            glTexStorage2DEXT(GL_TEXTURE_2D, 1, internalFormat, 1, 1);
        }

        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mTexture, 0);

        testBitCounts(mFramebuffer, minRedBits, minGreenBits, minBlueBits, minAlphaBits, 0, 0);
    }

    void testRenderbufferMultisampleFormat(int minESVersion,
                                           GLenum attachmentType,
                                           GLenum internalFormat)
    {
        int clientVersion = getClientMajorVersion();
        if (clientVersion < minESVersion)
        {
            return;
        }

        // Check that multisample is supported with at least two samples (minimum required is 1)
        bool supports2Samples = false;

        if (clientVersion == 2)
        {
            if (IsGLExtensionEnabled("ANGLE_framebuffer_multisample"))
            {
                int maxSamples;
                glGetIntegerv(GL_MAX_SAMPLES_ANGLE, &maxSamples);
                supports2Samples = maxSamples >= 2;
            }
        }
        else
        {
            assert(clientVersion >= 3);
            int maxSamples;
            glGetIntegerv(GL_MAX_SAMPLES, &maxSamples);
            supports2Samples = maxSamples >= 2;
        }

        if (!supports2Samples)
        {
            return;
        }

        glGenRenderbuffers(1, &mRenderbuffer);
        glBindRenderbuffer(GL_RENDERBUFFER, mRenderbuffer);

        EXPECT_GL_NO_ERROR();
        glRenderbufferStorageMultisampleANGLE(GL_RENDERBUFFER, 2, internalFormat, 128, 128);
        EXPECT_GL_NO_ERROR();
        glFramebufferRenderbuffer(GL_FRAMEBUFFER, attachmentType, GL_RENDERBUFFER, mRenderbuffer);
        EXPECT_GL_NO_ERROR();
    }

    void testZeroHeightRenderbuffer()
    {
        glGenRenderbuffers(1, &mRenderbuffer);
        glBindRenderbuffer(GL_RENDERBUFFER, mRenderbuffer);
        glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, 1, 0);
        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER,
                                  mRenderbuffer);
        EXPECT_GL_NO_ERROR();
    }

    void testSetUp() override
    {
        glGenFramebuffers(1, &mFramebuffer);
        glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer);
    }

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

        if (mRenderbuffer != 0)
        {
            glDeleteRenderbuffers(1, &mRenderbuffer);
            mRenderbuffer = 0;
        }

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

        if (mProgram != 0)
        {
            glDeleteProgram(mProgram);
            mProgram = 0;
        }
    }

    GLuint mFramebuffer;
    GLuint mTexture;
    GLuint mRenderbuffer;
    GLuint mProgram;
};

TEST_P(FramebufferFormatsTest, RGBA4)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3 &&
                       !IsGLExtensionEnabled("GL_EXT_texture_storage"));

    testTextureFormat(GL_RGBA4, 4, 4, 4, 4);
}

TEST_P(FramebufferFormatsTest, RGB565)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3 &&
                       !IsGLExtensionEnabled("GL_EXT_texture_storage"));

    testTextureFormat(GL_RGB565, 5, 6, 5, 0);
}

TEST_P(FramebufferFormatsTest, RGB8)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3 &&
                       (!IsGLExtensionEnabled("GL_OES_rgb8_rgba8") ||
                        !IsGLExtensionEnabled("GL_EXT_texture_storage")));

    testTextureFormat(GL_RGB8_OES, 8, 8, 8, 0);
}

TEST_P(FramebufferFormatsTest, BGRA8)
{
    ANGLE_SKIP_TEST_IF(
        !IsGLExtensionEnabled("GL_EXT_texture_format_BGRA8888") ||
        (getClientMajorVersion() < 3 && !IsGLExtensionEnabled("GL_EXT_texture_storage")));

    testTextureFormat(GL_BGRA8_EXT, 8, 8, 8, 8);
}

TEST_P(FramebufferFormatsTest, RGBA8)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3 &&
                       (!IsGLExtensionEnabled("GL_OES_rgb8_rgba8") ||
                        !IsGLExtensionEnabled("GL_EXT_texture_storage")));

    testTextureFormat(GL_RGBA8_OES, 8, 8, 8, 8);
}

TEST_P(FramebufferFormatsTest, RenderbufferMultisample_DEPTH16)
{
    testRenderbufferMultisampleFormat(2, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT16);
}

TEST_P(FramebufferFormatsTest, RenderbufferMultisample_DEPTH24)
{
    testRenderbufferMultisampleFormat(3, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT24);
}

TEST_P(FramebufferFormatsTest, RenderbufferMultisample_DEPTH32F)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3);

    testRenderbufferMultisampleFormat(3, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT32F);
}

TEST_P(FramebufferFormatsTest, RenderbufferMultisample_DEPTH24_STENCIL8)
{
    testRenderbufferMultisampleFormat(3, GL_DEPTH_STENCIL_ATTACHMENT, GL_DEPTH24_STENCIL8);
}

TEST_P(FramebufferFormatsTest, RenderbufferMultisample_DEPTH32F_STENCIL8)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3);

    testRenderbufferMultisampleFormat(3, GL_DEPTH_STENCIL_ATTACHMENT, GL_DEPTH32F_STENCIL8);
}

TEST_P(FramebufferFormatsTest, RenderbufferMultisample_STENCIL_INDEX8)
{
    // TODO(geofflang): Figure out how to support GLSTENCIL_INDEX8 on desktop GL
    ANGLE_SKIP_TEST_IF(IsDesktopOpenGL());

    testRenderbufferMultisampleFormat(2, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX8);
}

// Test that binding an incomplete cube map is rejected by ANGLE.
TEST_P(FramebufferFormatsTest, IncompleteCubeMap)
{
    // http://anglebug.com/3145
    ANGLE_SKIP_TEST_IF(IsFuchsia() && IsIntel() && IsVulkan());

    // First make a complete CubeMap.
    glGenTextures(1, &mTexture);
    glBindTexture(GL_TEXTURE_CUBE_MAP, mTexture);
    glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);
    glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);
    glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);
    glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);
    glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);
    glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X,
                           mTexture, 0);

    // Verify the framebuffer is complete.
    ASSERT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

    // Make the CubeMap cube-incomplete.
    glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);

    // Verify the framebuffer is incomplete.
    ASSERT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();

    // Verify drawing with the incomplete framebuffer produces a GL error
    mProgram = CompileProgram(essl1_shaders::vs::Simple(), essl1_shaders::fs::Red());
    ASSERT_NE(0u, mProgram);
    drawQuad(mProgram, essl1_shaders::PositionAttrib(), 0.5f);
    ASSERT_GL_ERROR(GL_INVALID_FRAMEBUFFER_OPERATION);
}

// Test that a renderbuffer with zero height but nonzero width is handled without crashes/asserts.
TEST_P(FramebufferFormatsTest, ZeroHeightRenderbuffer)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3);

    testZeroHeightRenderbuffer();
}

// Test to cover a bug where the read framebuffer affects the completeness of the draw framebuffer.
TEST_P(FramebufferFormatsTest, ReadDrawCompleteness)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3);

    GLTexture incompleteTexture;
    glBindTexture(GL_TEXTURE_2D, incompleteTexture);

    GLFramebuffer incompleteFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, incompleteFBO);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, incompleteTexture,
                           0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    GLTexture completeTexture;
    glBindTexture(GL_TEXTURE_2D, completeTexture);
    glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, getWindowWidth(), getWindowHeight());

    GLFramebuffer completeFBO;
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, completeFBO);
    glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                           completeTexture, 0);

    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_READ_FRAMEBUFFER));
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();

    // Simple draw program.
    ANGLE_GL_PROGRAM(program, essl1_shaders::vs::Simple(), essl1_shaders::fs::Red());

    drawQuad(program, essl1_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    EXPECT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, completeFBO);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);
}

// Use this to select which configurations (e.g. which renderer, which GLES major version) these
// tests should be run against.
ANGLE_INSTANTIATE_TEST(FramebufferFormatsTest,
                       ES2_VULKAN(),
                       ES2_D3D9(),
                       ES2_D3D11(),
                       ES3_D3D11(),
                       ES2_OPENGL(),
                       ES3_OPENGL(),
                       ES2_OPENGLES(),
                       ES3_OPENGLES());

class FramebufferTest_ES3 : public ANGLETest
{};

// Covers invalidating an incomplete framebuffer. This should be a no-op, but should not error.
TEST_P(FramebufferTest_ES3, InvalidateIncomplete)
{
    GLFramebuffer framebuffer;
    GLRenderbuffer renderbuffer;

    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
    glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, renderbuffer);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    std::vector<GLenum> attachments;
    attachments.push_back(GL_COLOR_ATTACHMENT0);

    glInvalidateFramebuffer(GL_FRAMEBUFFER, 1, attachments.data());
    EXPECT_GL_NO_ERROR();
}

// Test that the framebuffer state tracking robustly handles a depth-only attachment being set
// as a depth-stencil attachment. It is equivalent to detaching the depth-stencil attachment.
TEST_P(FramebufferTest_ES3, DepthOnlyAsDepthStencil)
{
    GLFramebuffer framebuffer;
    GLRenderbuffer renderbuffer;

    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
    glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, 4, 4);

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER,
                              renderbuffer);
    EXPECT_GLENUM_NE(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
}

// Test that the framebuffer correctly returns that it is not complete if invalid texture mip levels
// are bound
TEST_P(FramebufferTest_ES3, TextureAttachmentMipLevels)
{
    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D, texture);

    // Create a complete mip chain in mips 1 to 3
    glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 4, 4, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glTexImage2D(GL_TEXTURE_2D, 2, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glTexImage2D(GL_TEXTURE_2D, 3, GL_RGBA8, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    // Create another complete mip chain in mips 4 to 5
    glTexImage2D(GL_TEXTURE_2D, 4, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glTexImage2D(GL_TEXTURE_2D, 5, GL_RGBA8, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    // Create a non-complete mip chain in mip 6
    glTexImage2D(GL_TEXTURE_2D, 6, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    // Incomplete, mipLevel != baseLevel and texture is not mip complete
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 1);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    // Complete, mipLevel == baseLevel
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 1);
    ExpectFramebufferCompleteOrUnsupported(GL_FRAMEBUFFER);

    // Complete, mipLevel != baseLevel but texture is now mip complete
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 2);
    ExpectFramebufferCompleteOrUnsupported(GL_FRAMEBUFFER);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 3);
    ExpectFramebufferCompleteOrUnsupported(GL_FRAMEBUFFER);

    // Incomplete, attached level below the base level
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 2);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 1);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    // Incomplete, attached level is beyond effective max level
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 4);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    // Complete, mipLevel == baseLevel
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 4);
    ExpectFramebufferCompleteOrUnsupported(GL_FRAMEBUFFER);

    // Complete, mipLevel != baseLevel but texture is now mip complete
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 5);
    ExpectFramebufferCompleteOrUnsupported(GL_FRAMEBUFFER);

    // Complete, mipLevel == baseLevel
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 6);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 6);
    ExpectFramebufferCompleteOrUnsupported(GL_FRAMEBUFFER);
}

// Test that passing an attachment COLOR_ATTACHMENTm where m is equal to MAX_COLOR_ATTACHMENTS
// generates an INVALID_OPERATION.
// OpenGL ES Version 3.0.5 (November 3, 2016), 4.4.2.4 Attaching Texture Images to a Framebuffer, p.
// 208
TEST_P(FramebufferTest_ES3, ColorAttachmentIndexOutOfBounds)
{
    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer.get());

    GLint maxColorAttachments = 0;
    glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &maxColorAttachments);
    GLenum attachment = static_cast<GLenum>(maxColorAttachments + GL_COLOR_ATTACHMENT0);

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D, texture.get());
    glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA32F, 1, 1);
    glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, GL_TEXTURE_2D, texture.get(), 0);
    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
}

// Check that depth-only attachments report the correct number of samples.
TEST_P(FramebufferTest_ES3, MultisampleDepthOnly)
{
    GLRenderbuffer renderbuffer;
    glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
    glRenderbufferStorageMultisample(GL_RENDERBUFFER, 2, GL_DEPTH_COMPONENT24, 32, 32);

    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, renderbuffer);
    ASSERT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
    EXPECT_GL_NO_ERROR();

    GLint samples = 0;
    glGetIntegerv(GL_SAMPLES, &samples);
    EXPECT_GL_NO_ERROR();
    EXPECT_GE(samples, 2);
}

// Check that we only compare width and height of attachments, not depth.
TEST_P(FramebufferTest_ES3, AttachmentWith3DLayers)
{
    GLTexture texA;
    glBindTexture(GL_TEXTURE_2D, texA);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 4, 4, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    GLTexture texB;
    glBindTexture(GL_TEXTURE_3D, texB);
    glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA8, 4, 4, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texA, 0);
    glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, texB, 0, 0);
    ASSERT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
    EXPECT_GL_NO_ERROR();
}

// Test that clearing the stencil buffer when the framebuffer only has a color attachment does not
// crash.
TEST_P(FramebufferTest_ES3, ClearNonexistentStencil)
{
    GLRenderbuffer rbo;
    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, 1, 1);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);

    GLint clearValue = 0;
    glClearBufferiv(GL_STENCIL, 0, &clearValue);

    // There's no error specified for clearing nonexistent buffers, it's simply a no-op.
    EXPECT_GL_NO_ERROR();
}

// Test that clearing the depth buffer when the framebuffer only has a color attachment does not
// crash.
TEST_P(FramebufferTest_ES3, ClearNonexistentDepth)
{
    GLRenderbuffer rbo;
    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, 1, 1);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);

    GLfloat clearValue = 0.0f;
    glClearBufferfv(GL_DEPTH, 0, &clearValue);

    // There's no error specified for clearing nonexistent buffers, it's simply a no-op.
    EXPECT_GL_NO_ERROR();
}

// Test that clearing a nonexistent color attachment does not crash.
TEST_P(FramebufferTest_ES3, ClearNonexistentColor)
{
    GLRenderbuffer rbo;
    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, 1, 1);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);

    std::vector<GLfloat> clearValue = {{0.0f, 1.0f, 0.0f, 1.0f}};
    glClearBufferfv(GL_COLOR, 1, clearValue.data());

    // There's no error specified for clearing nonexistent buffers, it's simply a no-op.
    EXPECT_GL_NO_ERROR();
}

// Test that clearing the depth and stencil buffers when the framebuffer only has a color attachment
// does not crash.
TEST_P(FramebufferTest_ES3, ClearNonexistentDepthStencil)
{
    GLRenderbuffer rbo;
    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, 1, 1);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);

    glClearBufferfi(GL_DEPTH_STENCIL, 0, 0.0f, 0);

    // There's no error specified for clearing nonexistent buffers, it's simply a no-op.
    EXPECT_GL_NO_ERROR();
}

// Test that clearing a color attachment that has been deleted doesn't crash.
TEST_P(FramebufferTest_ES3, ClearDeletedAttachment)
{
    // An INVALID_FRAMEBUFFER_OPERATION error was seen in this test on Mac, not sure where it might
    // be originating from. http://anglebug.com/2834
    ANGLE_SKIP_TEST_IF(IsOSX() && IsOpenGL());

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);

    // There used to be a bug where some draw buffer state used to remain set even after the
    // attachment was detached via deletion. That's why we create, attach and delete this RBO here.
    GLuint rbo = 0u;
    glGenRenderbuffers(1, &rbo);
    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);
    glDeleteRenderbuffers(1, &rbo);

    // There needs to be at least one color attachment to prevent early out from the clear calls.
    GLRenderbuffer rbo2;
    glBindRenderbuffer(GL_RENDERBUFFER, rbo2);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, 1, 1);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_RENDERBUFFER, rbo2);

    ASSERT_GL_NO_ERROR();

    // There's no error specified for clearing nonexistent buffers, it's simply a no-op, so we
    // expect no GL errors below.
    std::array<GLfloat, 4> floatClearValue = {0.0f, 0.0f, 0.0f, 0.0f};
    glClearBufferfv(GL_COLOR, 0, floatClearValue.data());
    EXPECT_GL_NO_ERROR();
    std::array<GLuint, 4> uintClearValue = {0u, 0u, 0u, 0u};
    glClearBufferuiv(GL_COLOR, 0, uintClearValue.data());
    EXPECT_GL_NO_ERROR();
    std::array<GLint, 4> intClearValue = {0, 0, 0, 0};
    glClearBufferiv(GL_COLOR, 0, intClearValue.data());
    EXPECT_GL_NO_ERROR();
}

ANGLE_INSTANTIATE_TEST(FramebufferTest_ES3, ES3_D3D11(), ES3_OPENGL(), ES3_OPENGLES());

class FramebufferTest_ES31 : public ANGLETest
{
  protected:
    void validateSamplePass(GLuint &query, GLuint &passedCount, GLint width, GLint height)
    {
        glUniform2i(0, width - 1, height - 1);
        glBeginQuery(GL_ANY_SAMPLES_PASSED, query);
        glDrawArrays(GL_TRIANGLES, 0, 6);
        glEndQuery(GL_ANY_SAMPLES_PASSED);
        glGetQueryObjectuiv(query, GL_QUERY_RESULT, &passedCount);
        EXPECT_GT(static_cast<GLint>(passedCount), 0);

        glUniform2i(0, width - 1, height);
        glBeginQuery(GL_ANY_SAMPLES_PASSED, query);
        glDrawArrays(GL_TRIANGLES, 0, 6);
        glEndQuery(GL_ANY_SAMPLES_PASSED);
        glGetQueryObjectuiv(query, GL_QUERY_RESULT, &passedCount);
        EXPECT_EQ(static_cast<GLint>(passedCount), 0);

        glUniform2i(0, width, height - 1);
        glBeginQuery(GL_ANY_SAMPLES_PASSED, query);
        glDrawArrays(GL_TRIANGLES, 0, 6);
        glEndQuery(GL_ANY_SAMPLES_PASSED);
        glGetQueryObjectuiv(query, GL_QUERY_RESULT, &passedCount);
        EXPECT_EQ(static_cast<GLint>(passedCount), 0);
    }
};

// Test that without attachment, if either the value of FRAMEBUFFER_DEFAULT_WIDTH or
// FRAMEBUFFER_DEFAULT_HEIGHT parameters is zero, the framebuffer is incomplete.
TEST_P(FramebufferTest_ES31, IncompleteMissingAttachmentDefaultParam)
{
    // anglebug.com/3565
    ANGLE_SKIP_TEST_IF(IsVulkan());

    GLFramebuffer mFramebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer.get());

    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_WIDTH, 1);
    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_HEIGHT, 1);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_WIDTH, 0);
    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_HEIGHT, 0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_WIDTH, 1);
    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_HEIGHT, 0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_WIDTH, 0);
    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_HEIGHT, 1);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();
}

// Test that the sample count of a mix of texture and renderbuffer should be same.
TEST_P(FramebufferTest_ES31, IncompleteMultisampleSampleCountMix)
{
    // anglebug.com/3565
    ANGLE_SKIP_TEST_IF(IsVulkan());

    GLFramebuffer mFramebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer.get());

    GLTexture mTexture;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, mTexture.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 1, GL_RGBA8, 1, 1, true);

    GLRenderbuffer mRenderbuffer;
    glBindRenderbuffer(GL_RENDERBUFFER, mRenderbuffer.get());
    glRenderbufferStorageMultisample(GL_RENDERBUFFER, 2, GL_RGBA8, 1, 1);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           mTexture.get(), 0);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_RENDERBUFFER,
                              mRenderbuffer.get());
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();
}

// Test that the sample count of texture attachments should be same.
TEST_P(FramebufferTest_ES31, IncompleteMultisampleSampleCountTex)
{
    // anglebug.com/3565
    ANGLE_SKIP_TEST_IF(IsVulkan());

    GLFramebuffer mFramebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer.get());

    GLTexture mTextures[2];
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, mTextures[0].get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 1, GL_RGBA8, 1, 1, true);
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, mTextures[1].get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 2, GL_RGBA8, 1, 1, true);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           mTextures[0].get(), 0);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D_MULTISAMPLE,
                           mTextures[1].get(), 0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();
}

// Test that if the attached images are a mix of renderbuffers and textures, the value of
// TEXTURE_FIXED_SAMPLE_LOCATIONS must be TRUE for all attached textures.
TEST_P(FramebufferTest_ES31, IncompleteMultisampleFixedSampleLocationsMix)
{
    // anglebug.com/3565
    ANGLE_SKIP_TEST_IF(IsVulkan());

    GLFramebuffer mFramebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer.get());

    GLTexture mTexture;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, mTexture.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 1, GL_RGBA8, 1, 1, false);

    GLRenderbuffer mRenderbuffer;
    glBindRenderbuffer(GL_RENDERBUFFER, mRenderbuffer.get());
    glRenderbufferStorageMultisample(GL_RENDERBUFFER, 1, GL_RGBA8, 1, 1);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           mTexture.get(), 0);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_RENDERBUFFER,
                              mRenderbuffer.get());
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();
}

// Test that the value of TEXTURE_FIXED_SAMPLE_LOCATIONS is the same for all attached textures.
TEST_P(FramebufferTest_ES31, IncompleteMultisampleFixedSampleLocationsTex)
{
    // anglebug.com/3565
    ANGLE_SKIP_TEST_IF(IsVulkan());

    GLFramebuffer mFramebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer.get());

    GLTexture mTextures[2];
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, mTextures[0].get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 1, GL_RGBA8, 1, 1, false);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           mTextures[0].get(), 0);
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, mTextures[1].get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 1, GL_RGB8, 1, 1, true);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D_MULTISAMPLE,
                           mTextures[1].get(), 0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();
}

// If there are no attachments, rendering will be limited to a rectangle having a lower left of
// (0, 0) and an upper right of(width, height), where width and height are the framebuffer
// object's default width and height.
TEST_P(FramebufferTest_ES31, RenderingLimitToDefaultFBOSizeWithNoAttachments)
{
    // anglebug.com/2253
    ANGLE_SKIP_TEST_IF(IsLinux() && IsAMD() && IsDesktopOpenGL());
    // Occlusion query reports fragments outside the render area are still rendered
    ANGLE_SKIP_TEST_IF(IsAndroid() || (IsWindows() && (IsIntel() || IsAMD())));

    constexpr char kVS1[] = R"(#version 310 es
in layout(location = 0) highp vec2 a_position;
void main()
{
    gl_Position = vec4(a_position, 0.0, 1.0);
})";

    constexpr char kFS1[] = R"(#version 310 es
uniform layout(location = 0) highp ivec2 u_expectedSize;
out layout(location = 5) mediump vec4 f_color;
void main()
{
    if (ivec2(gl_FragCoord.xy) != u_expectedSize) discard;
    f_color = vec4(1.0, 0.5, 0.25, 1.0);
})";

    constexpr char kVS2[] = R"(#version 310 es
in layout(location = 0) highp vec2 a_position;
void main()
{
    gl_Position = vec4(a_position, 0.0, 1.0);
})";

    constexpr char kFS2[] = R"(#version 310 es
uniform layout(location = 0) highp ivec2 u_expectedSize;
out layout(location = 2) mediump vec4 f_color;
void main()
{
    if (ivec2(gl_FragCoord.xy) != u_expectedSize) discard;
    f_color = vec4(1.0, 0.5, 0.25, 1.0);
})";

    GLuint program1 = CompileProgram(kVS1, kFS1);
    ASSERT_NE(program1, 0u);

    GLuint program2 = CompileProgram(kVS2, kFS2);
    ASSERT_NE(program2, 0u);

    glUseProgram(program1);

    GLFramebuffer mFramebuffer;
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, mFramebuffer);
    GLuint defaultWidth  = 1;
    GLuint defaultHeight = 1;

    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_WIDTH, defaultWidth);
    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_HEIGHT, defaultHeight);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

    const float data[] = {
        1.0f, 1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f, -1.0f, -1.0f,
    };

    GLuint vertexArray  = 0;
    GLuint vertexBuffer = 0;
    GLuint query        = 0;
    GLuint passedCount  = 0;

    glGenQueries(1, &query);
    glGenVertexArrays(1, &vertexArray);
    glBindVertexArray(vertexArray);

    glGenBuffers(1, &vertexBuffer);
    glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
    glBufferData(GL_ARRAY_BUFFER, sizeof(data), data, GL_STATIC_DRAW);

    glEnableVertexAttribArray(0);
    glVertexAttribPointer(0, 2, GL_FLOAT, false, 0, 0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

    validateSamplePass(query, passedCount, defaultWidth, defaultHeight);

    glUseProgram(program2);
    validateSamplePass(query, passedCount, defaultWidth, defaultHeight);

    glUseProgram(program1);
    // If fbo has attachments, the rendering size should be the same as its attachment.
    GLTexture mTexture;
    GLuint width  = 2;
    GLuint height = 2;
    glBindTexture(GL_TEXTURE_2D, mTexture.get());
    glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, width, height);

    const GLenum bufs[] = {GL_NONE, GL_NONE, GL_NONE, GL_NONE, GL_NONE, GL_COLOR_ATTACHMENT5};

    glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT5, GL_TEXTURE_2D, mTexture.get(),
                           0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
    glDrawBuffers(6, bufs);

    validateSamplePass(query, passedCount, width, height);

    // If fbo's attachment has been removed, the rendering size should be the same as framebuffer
    // default size.
    glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT5, 0, 0, 0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

    validateSamplePass(query, passedCount, defaultWidth, defaultHeight);

    glDisableVertexAttribArray(0);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
    glBindVertexArray(0);
    glDeleteBuffers(1, &vertexBuffer);
    glDeleteVertexArrays(1, &vertexArray);

    ASSERT_GL_NO_ERROR();
}

ANGLE_INSTANTIATE_TEST(FramebufferTest_ES31,
                       ES31_D3D11(),
                       ES31_OPENGL(),
                       ES31_OPENGLES(),
                       ES31_VULKAN());

class AddDummyTextureNoRenderTargetTest : public ANGLETest
{
  public:
    AddDummyTextureNoRenderTargetTest()
    {
        setWindowWidth(512);
        setWindowHeight(512);
        setConfigRedBits(8);
        setConfigGreenBits(8);
        setConfigBlueBits(8);
        setConfigAlphaBits(8);
    }

    void overrideWorkaroundsD3D(FeaturesD3D *features) override
    {
        features->overrideFeatures({"add_dummy_texture_no_render_target"}, true);
    }
};

// Test to verify workaround succeeds when no program outputs exist http://anglebug.com/2283
TEST_P(AddDummyTextureNoRenderTargetTest, NoProgramOutputWorkaround)
{
    constexpr char kVS[] = "void main() {}";
    constexpr char kFS[] = "void main() {}";

    ANGLE_GL_PROGRAM(drawProgram, kVS, kFS);

    glUseProgram(drawProgram);

    glDrawArrays(GL_TRIANGLES, 0, 6);

    ASSERT_GL_NO_ERROR();
}

ANGLE_INSTANTIATE_TEST(AddDummyTextureNoRenderTargetTest, ES2_D3D11());
kc3-lang/angle/src/tests/gl_tests/FramebufferTest.cpp

Commit

kc3-lang/angle /src/tests/gl_tests/FramebufferTest.cpp
