WEBGL_multiview_test.cpp

Branch :
Show log
Commit
Author : Olli Etuaho
Date : 2017-11-03 15:48:52
Hash : bd3cd506
Message : Clean up HLSL constructor output Split generating HLSL struct constructors from generating built-in type constructors, as these didn't have much in common. Struct constructors are now only generated when they are needed, as opposed to before, when they were generated on any use of a struct. This changes built-in constructor naming to include "_ctor" and gets rid of having special built-in type names just for constructors. This will make it easier to do changes to constructor output, for example to add constructors for structs in std140 layout. This might be needed to implement SSBOs efficiently. This includes one bug fix for writing out struct declarations for varyings. Also improves const-correctness of accessing structs through TType in general. BUG=angleproject:2218 TEST=angle_unittests, angle_end2end_tests Change-Id: If865fb56f86486b9c4a2c31e016ea16427f4a5fa Reviewed-on: https://chromium-review.googlesource.com/753883 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
src/tests/compiler_tests/WEBGL_multiview_test.cpp
//
// Copyright (c) 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.
//
// WEBGL_multiview_test.cpp:
//   Test that shaders with gl_ViewID_OVR are validated correctly.
//

#include "GLSLANG/ShaderLang.h"
#include "compiler/translator/IntermTraverse.h"
#include "tests/test_utils/ShaderCompileTreeTest.h"
#include "tests/test_utils/compiler_test.h"

using namespace sh;

namespace
{

class SymbolOccurrenceCounter : public TIntermTraverser
{
  public:
    SymbolOccurrenceCounter() : TIntermTraverser(true, false, false), mNumberOfOccurrences(0u) {}

    void visitSymbol(TIntermSymbol *node) override
    {
        if (shouldCountSymbol(node))
        {
            ++mNumberOfOccurrences;
        }
    }

    virtual bool shouldCountSymbol(const TIntermSymbol *node) const = 0;

    unsigned getNumberOfOccurrences() const { return mNumberOfOccurrences; }

  private:
    unsigned mNumberOfOccurrences;
};

class SymbolOccurrenceCounterByQualifier : public SymbolOccurrenceCounter
{
  public:
    SymbolOccurrenceCounterByQualifier(TQualifier symbolQualifier)
        : mSymbolQualifier(symbolQualifier)
    {
    }

    bool shouldCountSymbol(const TIntermSymbol *node) const override
    {
        return node->getQualifier() == mSymbolQualifier;
    }

  private:
    TQualifier mSymbolQualifier;
};

class SymbolOccurrenceCounterByName : public SymbolOccurrenceCounter
{
  public:
    SymbolOccurrenceCounterByName(const TString &symbolName) : mSymbolName(symbolName) {}

    bool shouldCountSymbol(const TIntermSymbol *node) const override
    {
        return node->getName().getString() == mSymbolName;
    }

  private:
    TString mSymbolName;
};

class SymbolOccurrenceCounterByNameAndQualifier : public SymbolOccurrenceCounter
{
  public:
    SymbolOccurrenceCounterByNameAndQualifier(const TString &symbolName, TQualifier qualifier)
        : mSymbolName(symbolName), mSymbolQualifier(qualifier)
    {
    }

    bool shouldCountSymbol(const TIntermSymbol *node) const override
    {
        return node->getName().getString() == mSymbolName &&
               node->getQualifier() == mSymbolQualifier;
    }

  private:
    TString mSymbolName;
    TQualifier mSymbolQualifier;
};

class WEBGLMultiviewVertexShaderTest : public ShaderCompileTreeTest
{
  public:
    WEBGLMultiviewVertexShaderTest() {}
  protected:
    ::GLenum getShaderType() const override { return GL_VERTEX_SHADER; }
    ShShaderSpec getShaderSpec() const override { return SH_WEBGL3_SPEC; }
    void initResources(ShBuiltInResources *resources) override
    {
        resources->OVR_multiview = 1;
        resources->MaxViewsOVR   = 4;
    }
};

class WEBGLMultiviewFragmentShaderTest : public ShaderCompileTreeTest
{
  public:
    WEBGLMultiviewFragmentShaderTest() {}
  protected:
    ::GLenum getShaderType() const override { return GL_FRAGMENT_SHADER; }
    ShShaderSpec getShaderSpec() const override { return SH_WEBGL3_SPEC; }
    void initResources(ShBuiltInResources *resources) override
    {
        resources->OVR_multiview = 1;
        resources->MaxViewsOVR   = 4;
    }
};

class WEBGLMultiviewOutputCodeTest : public MatchOutputCodeTest
{
  public:
    WEBGLMultiviewOutputCodeTest(sh::GLenum shaderType)
        : MatchOutputCodeTest(shaderType, 0, SH_ESSL_OUTPUT)
    {
        addOutputType(SH_GLSL_COMPATIBILITY_OUTPUT);

        getResources()->OVR_multiview = 1;
        getResources()->MaxViewsOVR   = 4;
    }

    void requestHLSLOutput()
    {
#if defined(ANGLE_ENABLE_HLSL)
        addOutputType(SH_HLSL_4_1_OUTPUT);
#endif
    }

    bool foundInAllGLSLCode(const char *str)
    {
        return foundInGLSLCode(str) && foundInESSLCode(str);
    }

    bool foundInHLSLCode(const char *stringToFind) const
    {
#if defined(ANGLE_ENABLE_HLSL)
        return foundInCode(SH_HLSL_4_1_OUTPUT, stringToFind);
#else
        return true;
#endif
    }
};

class WEBGLMultiviewVertexShaderOutputCodeTest : public WEBGLMultiviewOutputCodeTest
{
  public:
    WEBGLMultiviewVertexShaderOutputCodeTest() : WEBGLMultiviewOutputCodeTest(GL_VERTEX_SHADER) {}
};

class WEBGLMultiviewFragmentShaderOutputCodeTest : public WEBGLMultiviewOutputCodeTest
{
  public:
    WEBGLMultiviewFragmentShaderOutputCodeTest() : WEBGLMultiviewOutputCodeTest(GL_FRAGMENT_SHADER)
    {
    }
};

class WEBGLMultiviewComputeShaderOutputCodeTest : public WEBGLMultiviewOutputCodeTest
{
  public:
    WEBGLMultiviewComputeShaderOutputCodeTest() : WEBGLMultiviewOutputCodeTest(GL_COMPUTE_SHADER) {}
};

void VariableOccursNTimes(TIntermBlock *root,
                          const TString &varName,
                          const TQualifier varQualifier,
                          unsigned n)
{
    // Check that there are n occurrences of the variable with the given name and qualifier.
    SymbolOccurrenceCounterByNameAndQualifier viewIDByNameAndQualifier(varName, varQualifier);
    root->traverse(&viewIDByNameAndQualifier);
    EXPECT_EQ(n, viewIDByNameAndQualifier.getNumberOfOccurrences());

    // Check that there are n occurrences of the variable with the given name. By this we guarantee
    // that there are no other occurrences of the variable with the same name but different
    // qualifier.
    SymbolOccurrenceCounterByName viewIDByName(varName);
    root->traverse(&viewIDByName);
    EXPECT_EQ(n, viewIDByName.getNumberOfOccurrences());
}

// Unsupported GL_OVR_multiview2 extension directive (WEBGL_multiview spec only exposes
// GL_OVR_multiview).
TEST_F(WEBGLMultiviewVertexShaderTest, InvalidMultiview2)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview2 : require\n"
        "layout(num_views = 2) in;\n"
        "void main()\n"
        "{\n"
        "    gl_Position.x = (gl_ViewID_OVR == 0u) ? 1.0 : 0.0;\n"
        "    gl_Position.yzw = vec3(0, 0, 1);\n"
        "}\n";
    if (compile(shaderString))
    {
        FAIL() << "Shader compilation succeeded, expecting failure:\n" << mInfoLog;
    }
}

// Invalid combination of non-matching num_views declarations.
TEST_F(WEBGLMultiviewVertexShaderTest, InvalidNumViewsMismatch)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 2) in;\n"
        "layout(num_views = 1) in;\n"
        "void main()\n"
        "{\n"
        "    gl_Position.x = (gl_ViewID_OVR == 0u) ? 1.0 : 0.0;\n"
        "    gl_Position.yzw = vec3(0, 0, 1);\n"
        "}\n";
    if (compile(shaderString))
    {
        FAIL() << "Shader compilation succeeded, expecting failure:\n" << mInfoLog;
    }
}

// Invalid value zero for num_views.
TEST_F(WEBGLMultiviewVertexShaderTest, InvalidNumViewsZero)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 0) in;\n"
        "void main()\n"
        "{\n"
        "    gl_Position.x = (gl_ViewID_OVR == 0u) ? 1.0 : 0.0;\n"
        "    gl_Position.yzw = vec3(0, 0, 1);\n"
        "}\n";
    if (compile(shaderString))
    {
        FAIL() << "Shader compilation succeeded, expecting failure:\n" << mInfoLog;
    }
}

// Too large value for num_views.
TEST_F(WEBGLMultiviewVertexShaderTest, InvalidNumViewsGreaterThanMax)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 5) in;\n"
        "void main()\n"
        "{\n"
        "    gl_Position.x = (gl_ViewID_OVR == 0u) ? 1.0 : 0.0;\n"
        "    gl_Position.yzw = vec3(0, 0, 1);\n"
        "}\n";
    if (compile(shaderString))
    {
        FAIL() << "Shader compilation succeeded, expecting failure:\n" << mInfoLog;
    }
}

// Valid use of gl_ViewID_OVR.
TEST_F(WEBGLMultiviewVertexShaderTest, ViewIDUsed)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 2) in;\n"
        "layout(num_views = 2) in;  // Duplicated on purpose\n"
        "in vec4 pos;\n"
        "out float myOutput;\n"
        "void main()\n"
        "{\n"
        "    if (gl_ViewID_OVR == 0u)\n"
        "    {\n"
        "        gl_Position = pos;\n"
        "        myOutput = 1.0;\n"
        "    }\n"
        "    else\n"
        "    {\n"
        "        gl_Position = pos + vec4(1.0, 0.0, 0.0, 0.0);\n"
        "        myOutput = 2.0;\n"
        "    }\n"
        "    gl_Position += (gl_ViewID_OVR == 0u) ? 1.0 : 0.0;\n"
        "}\n";
    if (!compile(shaderString))
    {
        FAIL() << "Shader compilation failed, expecting success:\n" << mInfoLog;
    }
}

// Read gl_FragCoord in a OVR_multiview fragment shader.
TEST_F(WEBGLMultiviewFragmentShaderTest, ReadOfFragCoord)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "precision highp float;\n"
        "out vec4 outColor;\n"
        "void main()\n"
        "{\n"
        "    outColor = vec4(gl_FragCoord.xy, 0, 1);\n"
        "}\n";
    if (!compile(shaderString))
    {
        FAIL() << "Shader compilation failed, expecting success:\n" << mInfoLog;
    }
}

// Read gl_ViewID_OVR in an OVR_multiview fragment shader.
TEST_F(WEBGLMultiviewFragmentShaderTest, ReadOfViewID)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "precision highp float;\n"
        "out vec4 outColor;\n"
        "void main()\n"
        "{\n"
        "    outColor = vec4(gl_ViewID_OVR, 0, 0, 1);\n"
        "}\n";
    if (!compile(shaderString))
    {
        FAIL() << "Shader compilation failed, expecting success:\n" << mInfoLog;
    }
}

// Correct use of GL_OVR_multiview macro.
TEST_F(WEBGLMultiviewVertexShaderTest, UseOfExtensionMacro)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#ifdef GL_OVR_multiview\n"
        "#if (GL_OVR_multiview == 1)\n"
        "void main()\n"
        "{\n"
        "    gl_Position = vec4(0.0, 0.0, 0.0, 1.0);\n"
        "}\n"
        "#endif\n"
        "#endif\n";
    if (!compile(shaderString))
    {
        FAIL() << "Shader compilation failed, expecting success:\n" << mInfoLog;
    }
}

// Test that gl_ViewID_OVR can't be used as an l-value.
TEST_F(WEBGLMultiviewVertexShaderTest, ViewIdAsLValue)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 2) in;\n"
        "void foo(out uint u)\n"
        "{\n"
        "    u = 3u;\n"
        "}\n"
        "void main()\n"
        "{\n"
        "    foo(gl_ViewID_OVR);\n"
        "    gl_Position = vec4(0.0, 0.0, 0.0, 1.0);\n"
        "}\n";
    if (compile(shaderString))
    {
        FAIL() << "Shader compilation succeeded, expecting failure:\n" << mInfoLog;
    }
}

// Test that compiling an ESSL 1.00 shader with multiview support succeeds.
TEST_F(WEBGLMultiviewVertexShaderTest, ESSL1Shader)
{
    const std::string &shaderString =
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 2) in;\n"
        "void main()\n"
        "{\n"
        "    if (gl_ViewID_OVR == 0)\n"
        "    {\n"
        "        gl_Position = vec4(-1.0, 0.0, 0.0, 1.0);\n"
        "    }\n"
        "    else\n"
        "    {\n"
        "        gl_Position = vec4(1.0, 0.0, 0.0, 1.0);\n"
        "    }\n"
        "}\n";
    if (!compile(shaderString))
    {
        FAIL() << "Shader compilation failed, expecting success:\n" << mInfoLog;
    }
}

// Test that compiling an ESSL 1.00 shader with an unsupported global layout qualifier fails.
TEST_F(WEBGLMultiviewVertexShaderTest, ESSL1ShaderUnsupportedGlobalLayoutQualifier)
{
    const std::string &shaderString =
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 2) in;\n"
        "layout(std140) uniform;\n"
        "void main()\n"
        "{\n"
        "    if (gl_ViewID_OVR == 0)\n"
        "    {\n"
        "        gl_Position = vec4(-1.0, 0.0, 0.0, 1.0);\n"
        "    }\n"
        "    else\n"
        "    {\n"
        "        gl_Position = vec4(1.0, 0.0, 0.0, 1.0);\n"
        "    }\n"
        "}\n";
    if (compile(shaderString))
    {
        FAIL() << "Shader compilation succeeded, expecting failure:\n" << mInfoLog;
    }
}

// Test that compiling an ESSL 1.00 vertex shader with an unsupported input storage qualifier fails.
TEST_F(WEBGLMultiviewVertexShaderTest, ESSL1ShaderUnsupportedInputStorageQualifier)
{
    const std::string &shaderString =
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 2) in;\n"
        "in vec4 pos;\n"
        "void main()\n"
        "{\n"
        "    if (gl_ViewID_OVR == 0)\n"
        "    {\n"
        "        gl_Position = vec4(-1.0, 0.0, 0.0, 1.0);\n"
        "    }\n"
        "    else\n"
        "    {\n"
        "        gl_Position = vec4(1.0, 0.0, 0.0, 1.0);\n"
        "    }\n"
        "}\n";
    if (compile(shaderString))
    {
        FAIL() << "Shader compilation succeeded, expecting failure:\n" << mInfoLog;
    }
}

// Test that compiling an ESSL 1.00 fragment shader with an unsupported input storage qualifier
// fails.
TEST_F(WEBGLMultiviewFragmentShaderTest, ESSL1ShaderUnsupportedInStorageQualifier)
{
    const std::string &shaderString =
        "#extension GL_OVR_multiview : require\n"
        "precision highp float;\n"
        "in vec4 color;\n"
        "void main()\n"
        "{\n"
        "    if (gl_ViewID_OVR == 0)\n"
        "    {\n"
        "        gl_FragColor = color;\n"
        "    }\n"
        "    else\n"
        "    {\n"
        "        gl_FragColor = color + vec4(1.0, 0.0, 0.0, 1.0);\n"
        "    }\n"
        "}\n";
    if (compile(shaderString))
    {
        FAIL() << "Shader compilation succeeded, expecting failure:\n" << mInfoLog;
    }
}

// Test that gl_InstanceID gets correctly replaced by InstanceID. gl_InstanceID should only be used
// twice: once to initialize ViewID_OVR and once for InstanceID. The number of occurrences of
// InstanceID in the AST should be the sum of two and the number of occurrences of gl_InstanceID
// before any renaming.
TEST_F(WEBGLMultiviewVertexShaderTest, GLInstanceIDIsRenamed)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 2) in;\n"
        "flat out int myInstance;\n"
        "out float myInstanceF;\n"
        "out float myInstanceF2;\n"
        "void main()\n"
        "{\n"
        "   gl_Position.x = gl_ViewID_OVR == 0u ? 0. : 1.;\n"
        "   gl_Position.yzw = vec3(0., 0., 1.);\n"
        "   myInstance = gl_InstanceID;\n"
        "   myInstanceF = float(gl_InstanceID) + .5;\n"
        "   myInstanceF2 = float(gl_InstanceID) + .1;\n"
        "}\n";
    mExtraCompileOptions |= SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW;
    compileAssumeSuccess(shaderString);

    SymbolOccurrenceCounterByName glInstanceIDByName("gl_InstanceID");
    mASTRoot->traverse(&glInstanceIDByName);
    EXPECT_EQ(2u, glInstanceIDByName.getNumberOfOccurrences());

    SymbolOccurrenceCounterByQualifier glInstanceIDByQualifier(EvqInstanceID);
    mASTRoot->traverse(&glInstanceIDByQualifier);
    EXPECT_EQ(2u, glInstanceIDByQualifier.getNumberOfOccurrences());

    SymbolOccurrenceCounterByName instanceIDByName("InstanceID");
    mASTRoot->traverse(&instanceIDByName);
    EXPECT_EQ(5u, instanceIDByName.getNumberOfOccurrences());
}

// Test that gl_ViewID_OVR gets correctly replaced by ViewID_OVR. gl_ViewID_OVR should not be found
// by either name or qualifier. The number of occurrences of ViewID_OVR in the AST should be the sum
// of two and the number of occurrences of gl_ViewID_OVR before any renaming.
TEST_F(WEBGLMultiviewVertexShaderTest, GLViewIDIsRenamed)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 2) in;\n"
        "flat out uint a;\n"
        "void main()\n"
        "{\n"
        "   gl_Position.x = gl_ViewID_OVR == 0u ? 0. : 1.;\n"
        "   gl_Position.yzw = vec3(0., 0., 1.);\n"
        "   a = gl_ViewID_OVR == 0u ? (gl_ViewID_OVR+2u) : gl_ViewID_OVR;\n"
        "}\n";
    mExtraCompileOptions |= SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW;
    compileAssumeSuccess(shaderString);

    SymbolOccurrenceCounterByName glViewIDOVRByName("gl_ViewID_OVR");
    mASTRoot->traverse(&glViewIDOVRByName);
    EXPECT_EQ(0u, glViewIDOVRByName.getNumberOfOccurrences());

    SymbolOccurrenceCounterByQualifier glViewIDOVRByQualifier(EvqViewIDOVR);
    mASTRoot->traverse(&glViewIDOVRByQualifier);
    EXPECT_EQ(0u, glViewIDOVRByQualifier.getNumberOfOccurrences());

    SymbolOccurrenceCounterByNameAndQualifier viewIDByNameAndQualifier("ViewID_OVR", EvqFlatOut);
    mASTRoot->traverse(&viewIDByNameAndQualifier);
    EXPECT_EQ(6u, viewIDByNameAndQualifier.getNumberOfOccurrences());
}

// The test checks that ViewID_OVR and InstanceID have the correct initializers based on the
// number of views.
TEST_F(WEBGLMultiviewVertexShaderOutputCodeTest, ViewIDAndInstanceIDHaveCorrectValues)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 3) in;\n"
        "flat out int myInstance;\n"
        "void main()\n"
        "{\n"
        "   gl_Position.x = gl_ViewID_OVR == 0u ? 0. : 1.;\n"
        "   gl_Position.yzw = vec3(0., 0., 1.);\n"
        "   myInstance = gl_InstanceID;\n"
        "}\n";
    requestHLSLOutput();
    compile(shaderString, SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW);

    EXPECT_TRUE(foundInAllGLSLCode("ViewID_OVR = (uint(gl_InstanceID) % 3u)"));
    EXPECT_TRUE(foundInAllGLSLCode("InstanceID = int((uint(gl_InstanceID) / 3u))"));

    EXPECT_TRUE(foundInHLSLCode("ViewID_OVR = (uint_ctor(gl_InstanceID) % 3)"));
    EXPECT_TRUE(foundInHLSLCode("InstanceID = int_ctor((uint_ctor(gl_InstanceID) / 3))"));
}

// The test checks that the directive enabling GL_OVR_multiview is not outputted if the extension is
// emulated.
TEST_F(WEBGLMultiviewVertexShaderOutputCodeTest, StrippedOVRMultiviewDirective)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 3) in;\n"
        "void main()\n"
        "{\n"
        "}\n";
    // The directive must not be present if any of the multiview emulation options are set.
    compile(shaderString, SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW);
    EXPECT_FALSE(foundInESSLCode("GL_OVR_multiview"));
    EXPECT_FALSE(foundInGLSLCode("GL_OVR_multiview"));

    compile(shaderString, SH_TRANSLATE_VIEWID_OVR_TO_UNIFORM);
    EXPECT_FALSE(foundInESSLCode("GL_OVR_multiview"));
    EXPECT_FALSE(foundInGLSLCode("GL_OVR_multiview"));

    // The directive should be outputted from the ESSL translator with none of the options being
    // set.
    compile(shaderString);
    EXPECT_TRUE(foundInESSLCode("GL_OVR_multiview"));
}

// Test that gl_InstanceID is collected in an ESSL1 shader if the
// SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW option is set.
TEST_F(WEBGLMultiviewVertexShaderTest, InstaceIDCollectedESSL1)
{
    const std::string &shaderString =
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 2) in;\n"
        "void main()\n"
        "{\n"
        "   gl_Position.x = gl_ViewID_OVR == 0 ? 0. : 1.;\n"
        "   gl_Position.yzw = vec3(0., 0., 1.);\n"
        "}\n";
    mExtraCompileOptions |= SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW;
    mExtraCompileOptions |= SH_VARIABLES;
    compileAssumeSuccess(shaderString);

    const std::vector<Attribute> &attributes = getAttributes();
    bool isGLInstanceIDFound                 = false;
    for (size_t i = 0u; i < attributes.size() && !isGLInstanceIDFound; ++i)
    {
        isGLInstanceIDFound = (attributes[i].name == "gl_InstanceID");
    }
    EXPECT_TRUE(isGLInstanceIDFound);
}

// Test that ViewID_OVR is declared as a flat input variable in an ESSL 3.00 fragment shader.
TEST_F(WEBGLMultiviewFragmentShaderTest, ViewIDDeclaredAsFlatInput)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "void main()\n"
        "{\n"
        "}\n";
    mExtraCompileOptions |= SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW;
    compileAssumeSuccess(shaderString);
    VariableOccursNTimes(mASTRoot, "ViewID_OVR", EvqFlatIn, 1u);
}

// Test that ViewID_OVR is declared as a flat output variable in an ESSL 1.00 vertex shader.
TEST_F(WEBGLMultiviewVertexShaderTest, ViewIDDeclaredAsFlatOutput)
{
    const std::string &shaderString =
        "#extension GL_OVR_multiview : require\n"
        "void main()\n"
        "{\n"
        "}\n";
    mExtraCompileOptions |= SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW;
    compileAssumeSuccess(shaderString);
    VariableOccursNTimes(mASTRoot, "ViewID_OVR", EvqFlatOut, 2u);
}

// The test checks that the GL_NV_viewport_array2 extension is emitted in a vertex shader if the
// SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER option is set.
TEST_F(WEBGLMultiviewVertexShaderOutputCodeTest, ViewportArray2IsEmitted)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 3) in;\n"
        "void main()\n"
        "{\n"
        "}\n";
    compile(shaderString, SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW |
                              SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER);
    EXPECT_TRUE(foundInAllGLSLCode("#extension GL_NV_viewport_array2 : require"));
}

// The test checks that the GL_NV_viewport_array2 extension is not emitted in a vertex shader if the
// OVR_multiview extension is not requested in the shader source even if the
// SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER option is set.
TEST_F(WEBGLMultiviewVertexShaderOutputCodeTest, ViewportArray2IsNotEmitted)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "void main()\n"
        "{\n"
        "}\n";
    compile(shaderString, SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW |
                              SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER);
    EXPECT_FALSE(foundInGLSLCode("#extension GL_NV_viewport_array2"));
    EXPECT_FALSE(foundInESSLCode("#extension GL_NV_viewport_array2"));
}

// The test checks that the GL_NV_viewport_array2 extension is not emitted in a fragment shader if
// the SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER option is set.
TEST_F(WEBGLMultiviewFragmentShaderOutputCodeTest, ViewportArray2IsNotEmitted)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "void main()\n"
        "{\n"
        "}\n";
    compile(shaderString, SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW |
                              SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER);
    EXPECT_FALSE(foundInGLSLCode("#extension GL_NV_viewport_array2"));
    EXPECT_FALSE(foundInESSLCode("#extension GL_NV_viewport_array2"));
}

// The test checks that the GL_NV_viewport_array2 extension is not emitted in a compute shader if
// the SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER option is set.
TEST_F(WEBGLMultiviewComputeShaderOutputCodeTest, ViewportArray2IsNotEmitted)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "void main()\n"
        "{\n"
        "}\n";
    compile(shaderString, SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW |
                              SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER);
    EXPECT_FALSE(foundInGLSLCode("#extension GL_NV_viewport_array2"));
    EXPECT_FALSE(foundInESSLCode("#extension GL_NV_viewport_array2"));
}

// The test checks that the viewport index is selected after the initialization of ViewID_OVR for
// GLSL and ESSL ouputs.
TEST_F(WEBGLMultiviewVertexShaderOutputCodeTest, GlViewportIndexIsSet)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 3) in;\n"
        "void main()\n"
        "{\n"
        "}\n";
    compile(shaderString, SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW |
                              SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER);
    const char glViewportIndexAssignment[] = "gl_ViewportIndex = int(ViewID_OVR)";

    // Check that the viewport index is selected.
    EXPECT_TRUE(foundInAllGLSLCode(glViewportIndexAssignment));

    // Setting gl_ViewportIndex must happen after ViewID_OVR's initialization.
    const char viewIDOVRAssignment[] = "ViewID_OVR = (uint(gl_InstanceID) % 3u)";
    size_t viewIDOVRAssignmentLoc = findInCode(SH_GLSL_COMPATIBILITY_OUTPUT, viewIDOVRAssignment);
    size_t glViewportIndexAssignmentLoc =
        findInCode(SH_GLSL_COMPATIBILITY_OUTPUT, glViewportIndexAssignment);
    EXPECT_LT(viewIDOVRAssignmentLoc, glViewportIndexAssignmentLoc);

    viewIDOVRAssignmentLoc       = findInCode(SH_ESSL_OUTPUT, viewIDOVRAssignment);
    glViewportIndexAssignmentLoc = findInCode(SH_ESSL_OUTPUT, glViewportIndexAssignment);
    EXPECT_LT(viewIDOVRAssignmentLoc, glViewportIndexAssignmentLoc);
}

// The test checks that the layer is selected after the initialization of ViewID_OVR for
// GLSL and ESSL ouputs.
TEST_F(WEBGLMultiviewVertexShaderOutputCodeTest, GlLayerIsSet)
{
    const std::string &shaderString =
        "#version 300 es\n"
        "#extension GL_OVR_multiview : require\n"
        "layout(num_views = 3) in;\n"
        "void main()\n"
        "{\n"
        "}\n";
    compile(shaderString, SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW |
                              SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER);
    const char glLayerAssignment[] = "gl_Layer = (int(ViewID_OVR) + multiviewBaseViewLayerIndex)";

    // Check that the layer is selected.
    EXPECT_TRUE(foundInAllGLSLCode(glLayerAssignment));

    // Setting gl_Layer must happen after ViewID_OVR's initialization.
    const char viewIDOVRAssignment[] = "ViewID_OVR = (uint(gl_InstanceID) % 3u)";
    size_t viewIDOVRAssignmentLoc = findInCode(SH_GLSL_COMPATIBILITY_OUTPUT, viewIDOVRAssignment);
    size_t glLayerAssignmentLoc   = findInCode(SH_GLSL_COMPATIBILITY_OUTPUT, glLayerAssignment);
    EXPECT_LT(viewIDOVRAssignmentLoc, glLayerAssignmentLoc);

    viewIDOVRAssignmentLoc = findInCode(SH_ESSL_OUTPUT, viewIDOVRAssignment);
    glLayerAssignmentLoc   = findInCode(SH_ESSL_OUTPUT, glLayerAssignment);
    EXPECT_LT(viewIDOVRAssignmentLoc, glLayerAssignmentLoc);
}

}  // namespace
kc3-lang/angle/src/tests/compiler_tests/WEBGL_multiview_test.cpp

Commit

kc3-lang/angle /src/tests/compiler_tests/WEBGL_multiview_test.cpp
