kc3-lang/angle/tests/angle_tests/TransformFeedbackTest.cpp

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• Author : Gregoire Payen de La Garanderie
  Date : 2015-02-04 14:55:39
  Hash : 5274202f
  Message : Unbind unused stream out from the D3D11 pipeline to avoid conflicts. Also allow points drawing without gl_PointSize if transform feedback is active. Change-Id: I172d423e847b35b94ebaea102dd97b695575c828 Reviewed-on: https://chromium-review.googlesource.com/246100 Tested-by: Gregoire Payen de La Garanderie <Gregory.Payen@imgtec.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>

• tests/angle_tests/TransformFeedbackTest.cpp

• #include "ANGLETest.h"
  
  // Use this to select which configurations (e.g. which renderer, which GLES major version) these tests should be run against.
  ANGLE_TYPED_TEST_CASE(TransformFeedbackTest, ES3_D3D11);
  
  template<typename T>
  class TransformFeedbackTest : public ANGLETest
  {
    protected:
      TransformFeedbackTest() : ANGLETest(T::GetGlesMajorVersion(), T::GetPlatform())
      {
          setWindowWidth(128);
          setWindowHeight(128);
          setConfigRedBits(8);
          setConfigGreenBits(8);
          setConfigBlueBits(8);
          setConfigAlphaBits(8);
      }
  
      virtual void SetUp()
      {
          ANGLETest::SetUp();
  
          const std::string vertexShaderSource = SHADER_SOURCE
          (
              precision highp float;
              attribute vec4 position;
  
              void main()
              {
                  gl_Position = position;
              }
          );
  
          const std::string fragmentShaderSource = SHADER_SOURCE
          (
              precision highp float;
  
              void main()
              {
                  gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
              }
          );
  
          mProgram = CompileProgram(vertexShaderSource, fragmentShaderSource);
          if (mProgram == 0)
          {
              FAIL() << "shader compilation failed.";
          }
  
          glGenBuffers(1, &mTransformFeedbackBuffer);
          mTransformFeedbackBufferSize = 1 << 24; // ~16MB
          glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, mTransformFeedbackBuffer);
          glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER, mTransformFeedbackBufferSize, NULL, GL_STATIC_DRAW);
  
          ASSERT_GL_NO_ERROR();
      }
  
      virtual void TearDown()
      {
          glDeleteProgram(mProgram);
          glDeleteBuffers(1, &mTransformFeedbackBuffer);
          ANGLETest::TearDown();
      }
  
      GLuint mProgram;
  
      size_t mTransformFeedbackBufferSize;
      GLuint mTransformFeedbackBuffer;
  };
  
  TYPED_TEST(TransformFeedbackTest, ZeroSizedViewport)
  {
      // Set the program's transform feedback varyings (just gl_Position)
      const GLchar* transformFeedbackVaryings[] =
      {
          "gl_Position"
      };
      glTransformFeedbackVaryings(mProgram, ArraySize(transformFeedbackVaryings), transformFeedbackVaryings, GL_INTERLEAVED_ATTRIBS);
      glLinkProgram(mProgram);
  
      // Re-link the program
      GLint linkStatus;
      glGetProgramiv(mProgram, GL_LINK_STATUS, &linkStatus);
      ASSERT_NE(linkStatus, 0);
  
      glUseProgram(mProgram);
  
      // Bind the buffer for transform feedback output and start transform feedback
      glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, mTransformFeedbackBuffer);
      glBeginTransformFeedback(GL_TRIANGLES);
  
      // Create a query to check how many primitives were written
      GLuint primitivesWrittenQuery = 0;
      glGenQueries(1, &primitivesWrittenQuery);
      glBeginQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN, primitivesWrittenQuery);
  
      // Set a viewport that would result in no pixels being written to the framebuffer and draw
      // a quad
      glViewport(0, 0, 0, 0);
  
      drawQuad(mProgram, "position", 0.5f);
  
      // End the query and transform feedkback
      glEndQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN);
      glEndTransformFeedback();
  
      // Check how many primitives were written and verify that some were written even if
      // no pixels were rendered
      GLuint primitivesWritten = 0;
      glGetQueryObjectuiv(primitivesWrittenQuery, GL_QUERY_RESULT_EXT, &primitivesWritten);
      EXPECT_GL_NO_ERROR();
  
      EXPECT_EQ(primitivesWritten, 2);
  }
  
  // Test that XFB can write back vertices to a buffer and that we can draw from this buffer afterward.
  TYPED_TEST(TransformFeedbackTest, RecordAndDraw)
  {
      // Set the program's transform feedback varyings (just gl_Position)
      const GLchar* transformFeedbackVaryings[] =
      {
          "gl_Position"
      };
      glTransformFeedbackVaryings(mProgram, ArraySize(transformFeedbackVaryings), transformFeedbackVaryings, GL_INTERLEAVED_ATTRIBS);
      glLinkProgram(mProgram);
  
      // Re-link the program
      GLint linkStatus;
      glGetProgramiv(mProgram, GL_LINK_STATUS, &linkStatus);
      ASSERT_NE(linkStatus, 0);
  
      glUseProgram(mProgram);
  
      GLint positionLocation = glGetAttribLocation(mProgram, "position");
  
      // First pass: draw 6 points to the XFB buffer
      glEnable(GL_RASTERIZER_DISCARD);
  
      const GLfloat vertices[] =
      {
          -1.0f,  1.0f, 0.5f,
          -1.0f, -1.0f, 0.5f,
           1.0f, -1.0f, 0.5f,
  
          -1.0f,  1.0f, 0.5f,
           1.0f, -1.0f, 0.5f,
           1.0f,  1.0f, 0.5f,
      };
  
      glVertexAttribPointer(positionLocation, 3, GL_FLOAT, GL_FALSE, 0, vertices);
      glEnableVertexAttribArray(positionLocation);
  
      // Bind the buffer for transform feedback output and start transform feedback
      glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, mTransformFeedbackBuffer);
      glBeginTransformFeedback(GL_POINTS);
  
      // Create a query to check how many primitives were written
      GLuint primitivesWrittenQuery = 0;
      glGenQueries(1, &primitivesWrittenQuery);
      glBeginQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN, primitivesWrittenQuery);
  
      glDrawArrays(GL_POINTS, 0, 6);
  
      glDisableVertexAttribArray(positionLocation);
      glVertexAttribPointer(positionLocation, 4, GL_FLOAT, GL_FALSE, 0, NULL);
      // End the query and transform feedkback
      glEndQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN);
      glEndTransformFeedback();
  
      glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, 0);
  
      glDisable(GL_RASTERIZER_DISCARD);
  
      // Check how many primitives were written and verify that some were written even if
      // no pixels were rendered
      GLuint primitivesWritten = 0;
      glGetQueryObjectuiv(primitivesWrittenQuery, GL_QUERY_RESULT_EXT, &primitivesWritten);
      EXPECT_GL_NO_ERROR();
  
      EXPECT_EQ(primitivesWritten, 6);
  
      // Nothing should have been drawn to the framebuffer
      EXPECT_PIXEL_EQ(getWindowWidth() / 2, getWindowHeight() / 2, 0, 0, 0, 0);
  
      // Second pass: draw from the feedback buffer
  
      glBindBuffer(GL_ARRAY_BUFFER, mTransformFeedbackBuffer);
      glVertexAttribPointer(positionLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
      glEnableVertexAttribArray(positionLocation);
  
      glDrawArrays(GL_TRIANGLES, 0, 6);
  
      EXPECT_PIXEL_EQ(getWindowWidth() / 2, getWindowHeight() / 2, 255,   0,   0, 255);
      EXPECT_GL_NO_ERROR();
  }