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

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• Hash : 4e47b92f
  Author :
  Date : 2015-02-03T09:04:20
  

  Fix instanced point sprites when gl_PointSize is specified but not used
  
  Change-Id: I2350fa60cae55f02d7b484c34544c035acaba6ad
  Reviewed-on: https://chromium-review.googlesource.com/245703
  Reviewed-by: Austin Kinross <aukinros@microsoft.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Tested-by: Jamie Madill <jmadill@chromium.org>
  

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• tests/angle_tests/PointSpritesTest.cpp

• #include "ANGLETest.h"
  
  // Use this to select which configurations (e.g. which renderer, which GLES
  // major version) these tests should be run against.
  //
  // Some of the pointsprite tests below were ported from Khronos WebGL
  // conformance test suite.
  
  //
  // We test on D3D11 9_3 because the existing D3D11 PointSprite implementation
  // uses Geometry Shaders which are not supported for 9_3.
  // D3D9 and D3D11 are also tested to ensure no regressions.
  ANGLE_TYPED_TEST_CASE(PointSpritesTest, ES2_D3D9, ES2_D3D11, ES2_D3D11_FL9_3);
  
  template<typename T>
  class PointSpritesTest : public ANGLETest
  {
    protected:
      const int windowWidth = 256;
      const int windowHeight = 256;
      PointSpritesTest() : ANGLETest(T::GetGlesMajorVersion(), T::GetPlatform())
      {
          setWindowWidth(windowWidth);
          setWindowHeight(windowHeight);
          setConfigRedBits(8);
          setConfigGreenBits(8);
          setConfigBlueBits(8);
          setConfigAlphaBits(8);
      }
  
      virtual void SetUp()
      {
          ANGLETest::SetUp();
      }
  
      float s2p(float s)
      {
          return (s + 1.0f) * 0.5f * (GLfloat)windowWidth;
      }
  };
  
  // Checks gl_PointCoord and gl_PointSize
  // https://www.khronos.org/registry/webgl/sdk/tests/conformance/glsl/variables/gl-pointcoord.html
  TYPED_TEST(PointSpritesTest, PointCoordAndPointSizeCompliance)
  {
      const std::string fs = SHADER_SOURCE
      (
          precision mediump float;
          void main()
          {
              gl_FragColor = vec4(
                  gl_PointCoord.x,
                  gl_PointCoord.y,
                  0,
                  1);
          }
      );
  
      const std::string vs = SHADER_SOURCE
      (
          attribute vec4 vPosition;
          uniform float uPointSize;
          void main()
          {
              gl_PointSize = uPointSize;
              gl_Position = vPosition;
          }
      );
  
      GLuint program = CompileProgram(vs, fs);
      ASSERT_NE(program, 0u);
      ASSERT_GL_NO_ERROR();
  
      glUseProgram(program);
  
      GLfloat pointSizeRange[2] = {};
      glGetFloatv(GL_ALIASED_POINT_SIZE_RANGE, pointSizeRange);
  
      GLfloat maxPointSize = pointSizeRange[1];
  
      ASSERT_TRUE(maxPointSize >= 1);
      maxPointSize = floorf(maxPointSize);
      ASSERT_TRUE((int)maxPointSize % 1 == 0);
  
      maxPointSize = std::min(maxPointSize, 64.0f);
      GLfloat pointWidth = maxPointSize / windowWidth;
      GLfloat step = floorf(maxPointSize / 4);
      GLfloat pointStep = std::max<GLfloat>(1.0f, step);
  
      GLint pointSizeLoc = glGetUniformLocation(program, "uPointSize");
      ASSERT_GL_NO_ERROR();
  
      glUniform1f(pointSizeLoc, maxPointSize);
      ASSERT_GL_NO_ERROR();
  
      GLfloat pixelOffset = ((int)maxPointSize % 2) ? (1.0f / (GLfloat)windowWidth) : 0;
      GLuint vertexObject = 0;
      glGenBuffers(1, &vertexObject);
      ASSERT_NE(vertexObject, 0U);
      ASSERT_GL_NO_ERROR();
  
      glBindBuffer(GL_ARRAY_BUFFER, vertexObject);
      ASSERT_GL_NO_ERROR();
  
      GLfloat thePoints[] = { -0.5 + pixelOffset, -0.5 + pixelOffset,
                               0.5 + pixelOffset, -0.5 + pixelOffset,
                              -0.5 + pixelOffset,  0.5 + pixelOffset,
                               0.5 + pixelOffset,  0.5 + pixelOffset };
  
      glBufferData(GL_ARRAY_BUFFER, sizeof(thePoints), thePoints, GL_STATIC_DRAW);
      ASSERT_GL_NO_ERROR();
  
      glEnableVertexAttribArray(0);
      glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
      glDrawArrays(GL_POINTS, 0, 4);
      ASSERT_GL_NO_ERROR();
  
      glDeleteBuffers(1, &vertexObject);
  
      std::string debugText;
      for (float py = 0; py < 2; ++py) {
          for (float px = 0; px < 2; ++px) {
              float pointX = -0.5 + px + pixelOffset;
              float pointY = -0.5 + py + pixelOffset;
              for (int yy = 0; yy < maxPointSize; yy += pointStep) {
                  for (int xx = 0; xx < maxPointSize; xx += pointStep) {
                      // formula for s and t from OpenGL ES 2.0 spec section 3.3
                      float xw = s2p(pointX);
                      float yw = s2p(pointY);
                      float u = xx / maxPointSize * 2 - 1;
                      float v = yy / maxPointSize * 2 - 1;
                      float xf = floorf(s2p(pointX + u * pointWidth));
                      float yf = floorf(s2p(pointY + v * pointWidth));
                      float s = 0.5 + (xf + 0.5 - xw) / maxPointSize;
                      float t = 0.5 + (yf + 0.5 - yw) / maxPointSize;
                      GLubyte color[4] = { floorf(s * 255), floorf((1 - t) * 255), 0, 255 };
                      EXPECT_PIXEL_NEAR(xf, yf, color[0], color[1], color[2], color[3], 4);
                  }
              }
          }
      }
  }
  
  // Verify that drawing a point without enabling any attributes succeeds
  // https://www.khronos.org/registry/webgl/sdk/tests/conformance/rendering/point-no-attributes.html
  TYPED_TEST(PointSpritesTest, PointWithoutAttributesCompliance)
  {
      const std::string fs = SHADER_SOURCE
      (
          precision mediump float;
          void main()
          {
              gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
          }
      );
  
      const std::string vs = SHADER_SOURCE
      (
          void main()
          {
              gl_PointSize = 1.0;
              gl_Position = vec4(0.0, 0.0, 0.0, 1.0);
          }
      );
  
      GLuint program = CompileProgram(vs, fs);
      ASSERT_NE(program, 0u);
      ASSERT_GL_NO_ERROR();
  
      glUseProgram(program);
  
      glDrawArrays(GL_POINTS, 0, 1);
      ASSERT_GL_NO_ERROR();
  
      // expect the center pixel to be green
      EXPECT_PIXEL_EQ((windowWidth - 1) / 2, (windowHeight - 1) / 2, 0, 255, 0, 255);
  }
  
  // This is a regression test for a graphics driver bug affecting end caps on roads in MapsGL
  // https://www.khronos.org/registry/webgl/sdk/tests/conformance/rendering/point-with-gl-pointcoord-in-fragment-shader.html
  TYPED_TEST(PointSpritesTest, PointCoordRegressionTest)
  {
      const std::string fs = SHADER_SOURCE
      (
          precision mediump float;
          varying vec4 v_color;
          void main()
          {
              // It seems as long as this mathematical expression references
              // gl_PointCoord, the fragment's color is incorrect.
              vec2 diff = gl_PointCoord - vec2(.5, .5);
              if (length(diff) > 0.5)
                  discard;
  
              // The point should be a solid color.
              gl_FragColor = v_color;
          }
      );
  
      const std::string vs = SHADER_SOURCE
      (
          varying vec4 v_color;
          // The X and Y coordinates of the center of the point.
          attribute vec2 a_vertex;
          uniform float u_pointSize;
          void main()
          {
              gl_PointSize = u_pointSize;
              gl_Position = vec4(a_vertex, 0.0, 1.0);
              // The color of the point.
              v_color = vec4(0.0, 1.0, 0.0, 1.0);
          }
      );
  
      GLuint program = CompileProgram(vs, fs);
      ASSERT_NE(program, 0u);
      ASSERT_GL_NO_ERROR();
  
      glUseProgram(program);
  
      GLfloat pointSizeRange[2] = {};
      glGetFloatv(GL_ALIASED_POINT_SIZE_RANGE, pointSizeRange);
  
      GLfloat maxPointSize = pointSizeRange[1];
  
      ASSERT_TRUE(maxPointSize > 2);
  
      glClearColor(0, 0, 0, 1);
      glDisable(GL_DEPTH_TEST);
      glClear(GL_COLOR_BUFFER_BIT);
  
      GLint pointSizeLoc = glGetUniformLocation(program, "u_pointSize");
      ASSERT_GL_NO_ERROR();
  
      GLfloat pointSize = std::min<GLfloat>(20.0f, maxPointSize);
      glUniform1f(pointSizeLoc, pointSize);
      ASSERT_GL_NO_ERROR();
  
      GLuint vertexObject = 0;
      glGenBuffers(1, &vertexObject);
      ASSERT_NE(vertexObject, 0U);
      ASSERT_GL_NO_ERROR();
  
      glBindBuffer(GL_ARRAY_BUFFER, vertexObject);
      ASSERT_GL_NO_ERROR();
  
      GLfloat thePoints[] = { 0.0f, 0.0f };
  
      glBufferData(GL_ARRAY_BUFFER, sizeof(thePoints), thePoints, GL_STATIC_DRAW);
      ASSERT_GL_NO_ERROR();
  
      glEnableVertexAttribArray(0);
      glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
  
      glDrawArrays(GL_POINTS, 0, 1);
      ASSERT_GL_NO_ERROR();
  
      // expect the center pixel to be green
      EXPECT_PIXEL_EQ((windowWidth - 1) / 2, (windowHeight - 1) / 2, 0, 255, 0, 255);
  
      glDeleteBuffers(1, &vertexObject);
  }
  
  // Verify GL_VERTEX_PROGRAM_POINT_SIZE is enabled
  // https://www.khronos.org/registry/webgl/sdk/tests/conformance/rendering/point-size.html
  TYPED_TEST(PointSpritesTest, PointSizeEnabledCompliance)
  {
      const std::string fs = SHADER_SOURCE
      (
          precision mediump float;
          varying vec4 color;
  
          void main()
          {
              gl_FragColor = color;
          }
      );
  
      const std::string vs = SHADER_SOURCE
      (
          attribute vec3 pos;
          attribute vec4 colorIn;
          uniform float pointSize;
          varying vec4 color;
  
          void main()
          {
              gl_PointSize = pointSize;
              color = colorIn;
              gl_Position = vec4(pos, 1.0);
          }
      );
  
      GLuint program = CompileProgram(vs, fs);
      ASSERT_NE(program, 0u);
      ASSERT_GL_NO_ERROR();
  
      glUseProgram(program);
  
      glDisable(GL_BLEND);
  
      // The choice of (0.4, 0.4) ensures that the centers of the surrounding
      // pixels are not contained within the point when it is of size 1, but
      // that they definitely are when it is of size 2.
      GLfloat vertices[] = { 0.4f, 0.4f, 0.0f };
      GLubyte colors[] = { 255, 0, 0, 255 };
  
      GLuint vertexObject = 0;
      glGenBuffers(1, &vertexObject);
      ASSERT_NE(vertexObject, 0U);
      ASSERT_GL_NO_ERROR();
  
      glBindBuffer(GL_ARRAY_BUFFER, vertexObject);
      ASSERT_GL_NO_ERROR();
  
      glBufferData(GL_ARRAY_BUFFER, sizeof(vertices) + sizeof(colors), NULL, GL_STATIC_DRAW);
      ASSERT_GL_NO_ERROR();
  
      glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
      ASSERT_GL_NO_ERROR();
  
      glBufferSubData(GL_ARRAY_BUFFER, sizeof(vertices), sizeof(colors), colors);
      ASSERT_GL_NO_ERROR();
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
      glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
      glEnableVertexAttribArray(0);
  
      glVertexAttribPointer(1, 4, GL_UNSIGNED_BYTE, GL_TRUE, 0, (GLvoid*)sizeof(vertices));
      glEnableVertexAttribArray(1);
  
      GLint pointSizeLoc = glGetUniformLocation(program, "pointSize");
      ASSERT_GL_NO_ERROR();
  
      glUniform1f(pointSizeLoc, 1.0f);
      ASSERT_GL_NO_ERROR();
  
      glDrawArrays(GL_POINTS, 0, _countof(vertices) / 3);
      ASSERT_GL_NO_ERROR();
  
      // Test the pixels around the target Red pixel to ensure
      // they are the expected color values
      for (GLint y = 178; y < 180; ++y)
      {
          for (GLint x = 178; x < 180; ++x)
          {
              // 179x179 is expected to be a red pixel
              // All others are black
              GLubyte expectedColor[4] = { 0, 0, 0, 0 };
              if (x == 179 && y == 179)
              {
                  expectedColor[0] = 255;
                  expectedColor[3] = 255;
              }
              EXPECT_PIXEL_EQ(x, y, expectedColor[0], expectedColor[1], expectedColor[2], expectedColor[3]);
          }
      }
  
      swapBuffers();
  
      GLfloat pointSizeRange[2] = {};
      glGetFloatv(GL_ALIASED_POINT_SIZE_RANGE, pointSizeRange);
  
      if (pointSizeRange[1] >= 2.0)
      {
          // Draw a point of size 2 and verify it fills the appropriate region.
          glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
          glUniform1f(pointSizeLoc, 2.0f);
          ASSERT_GL_NO_ERROR();
  
          glDrawArrays(GL_POINTS, 0, _countof(vertices) / 3);
          ASSERT_GL_NO_ERROR();
  
          // Test the pixels to ensure the target is ALL Red pixels
          for (GLint y = 178; y < 180; ++y)
          {
              for (GLint x = 178; x < 180; ++x)
              {
                  EXPECT_PIXEL_EQ(x, y, 255, 0, 0, 255);
              }
          }
      }
  
      glDeleteBuffers(1, &vertexObject);
  }
  
  // Verify that rendering works correctly when gl_PointSize is declared in a shader but isn't used
  TYPED_TEST(PointSpritesTest, PointSizeDeclaredButUnused)
  {
      const std::string vs = SHADER_SOURCE
      (
          attribute highp vec4 position;
  
          void main(void)
          {
              gl_PointSize = 1.0;
              gl_Position = position;
          }
      );
  
      const std::string fs = SHADER_SOURCE
      (
          void main(void)
          {
              gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
          }
      );
  
      GLuint program = CompileProgram(vs, fs);
      ASSERT_NE(program, 0u);
      ASSERT_GL_NO_ERROR();
  
      glUseProgram(program);
      drawQuad(program, "position", 0.5f, 1.0f);
      ASSERT_GL_NO_ERROR();
  
      // expect the center pixel to be red
      EXPECT_PIXEL_EQ(getWindowWidth() / 2, getWindowHeight() / 2, 255, 0, 0, 255);
  
      glDeleteProgram(program);
  }
  

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