src/third_party/angle/tests/angle_tests/TransformFeedbackTest.cpp

   1 #include "ANGLETest.h"
   2
   3 // Use this to select which configurations (e.g. which renderer, which GLES major version) these tests should be run against.
   4 typedef ::testing::Types<TFT<Gles::Three, Rend::D3D11>> TestFixtureTypes;
   5 TYPED_TEST_CASE(TransformFeedbackTest, TestFixtureTypes);
   6
   7 template<typename T>
   8 class TransformFeedbackTest : public ANGLETest
   9 {
  10   protected:
  11     TransformFeedbackTest() : ANGLETest(T::GetGlesMajorVersion(), T::GetRequestedRenderer())
  12     {
  13         setWindowWidth(128);
  14         setWindowHeight(128);
  15         setConfigRedBits(8);
  16         setConfigGreenBits(8);
  17         setConfigBlueBits(8);
  18         setConfigAlphaBits(8);
  19     }
  20
  21     virtual void SetUp()
  22     {
  23         ANGLETest::SetUp();
  24
  25         const std::string vertexShaderSource = SHADER_SOURCE
  26         (
  27             precision highp float;
  28             attribute vec4 position;
  29
  30             void main()
  31             {
  32                 gl_Position = position;
  33             }
  34         );
  35
  36         const std::string fragmentShaderSource = SHADER_SOURCE
  37         (
  38             precision highp float;
  39
  40             void main()
  41             {
  42                 gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
  43             }
  44         );
  45
  46         mProgram = CompileProgram(vertexShaderSource, fragmentShaderSource);
  47         if (mProgram == 0)
  48         {
  49             FAIL() << "shader compilation failed.";
  50         }
  51
  52         glGenBuffers(1, &mTransformFeedbackBuffer);
  53         mTransformFeedbackBufferSize = 1 << 24; // ~16MB
  54         glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, mTransformFeedbackBuffer);
  55         glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER, mTransformFeedbackBufferSize, NULL, GL_STATIC_DRAW);
  56
  57         ASSERT_GL_NO_ERROR();
  58     }
  59
  60     virtual void TearDown()
  61     {
  62         glDeleteProgram(mProgram);
  63         glDeleteBuffers(1, &mTransformFeedbackBuffer);
  64         ANGLETest::TearDown();
  65     }
  66
  67     GLuint mProgram;
  68
  69     size_t mTransformFeedbackBufferSize;
  70     GLuint mTransformFeedbackBuffer;
  71 };
  72
  73 TYPED_TEST(TransformFeedbackTest, ZeroSizedViewport)
  74 {
  75     // Set the program's transform feedback varyings (just gl_Position)
  76     const GLchar* transformFeedbackVaryings[] =
  77     {
  78         "gl_Position"
  79     };
  80     glTransformFeedbackVaryings(mProgram, ArraySize(transformFeedbackVaryings), transformFeedbackVaryings, GL_INTERLEAVED_ATTRIBS);
  81     glLinkProgram(mProgram);
  82
  83     // Re-link the program
  84     GLint linkStatus;
  85     glGetProgramiv(mProgram, GL_LINK_STATUS, &linkStatus);
  86     ASSERT_NE(linkStatus, 0);
  87
  88     glUseProgram(mProgram);
  89
  90     // Bind the buffer for transform feedback output and start transform feedback
  91     glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, mTransformFeedbackBuffer);
  92     glBeginTransformFeedback(GL_TRIANGLES);
  93
  94     // Create a query to check how many primitives were written
  95     GLuint primitivesWrittenQuery = 0;
  96     glGenQueries(1, &primitivesWrittenQuery);
  97     glBeginQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN, primitivesWrittenQuery);
  98
  99     // Set a viewport that would result in no pixels being written to the framebuffer and draw
 100     // a quad
 101     glViewport(0, 0, 0, 0);
 102
 103     drawQuad(mProgram, "position", 0.5f);
 104
 105     // End the query and transform feedkback
 106     glEndQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN);
 107     glEndTransformFeedback();
 108
 109     // Check how many primitives were written and verify that some were written even if
 110     // no pixels were rendered
 111     GLuint primitivesWritten = 0;
 112     glGetQueryObjectuiv(primitivesWrittenQuery, GL_QUERY_RESULT_EXT, &primitivesWritten);
 113     EXPECT_GL_NO_ERROR();
 114
 115     EXPECT_EQ(primitivesWritten, 2);
 116 }