Added OES_vertex_array_object tests

Change-Id: I2586ad7ea95b463147dbdae95484d70ac602ec67

Author: kakashidinho

src/tests/gl_tests/StateChangeTest.cpp

@@ -876,6 +876,88 @@ TEST_P(StateChangeTest, VertexBufferUpdatedAfterDraw)
     ASSERT_GL_NO_ERROR();
 }
 
+// Test that switching VAOs keeps the disabled "current value" attributes up-to-date.
+// OES_vertex_array_object version.
+TEST_P(StateChangeTest, VertexArrayObjectAndDisabledAttributes)
+{
+    ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_OES_vertex_array_object"));
+
+    constexpr char kSingleVS[] = "attribute vec4 position; void main() { gl_Position = position; }";
+    constexpr char kSingleFS[] = "void main() { gl_FragColor = vec4(1, 0, 0, 1); }";
+    ANGLE_GL_PROGRAM(singleProgram, kSingleVS, kSingleFS);
+
+    constexpr char kDualVS[] =
+        "attribute vec4 position;\n"
+        "attribute vec4 color;\n"
+        "varying vec4 varyColor;\n"
+        "void main()\n"
+        "{\n"
+        "    gl_Position = position;\n"
+        "    varyColor = color;\n"
+        "}";
+    constexpr char kDualFS[] =
+        "precision mediump float;\n"
+        "varying vec4 varyColor;\n"
+        "void main()\n"
+        "{\n"
+        "    gl_FragColor = varyColor;\n"
+        "}";
+    ANGLE_GL_PROGRAM(dualProgram, kDualVS, kDualFS);
+    GLint positionLocation = glGetAttribLocation(dualProgram, "position");
+    ASSERT_NE(-1, positionLocation);
+    GLint colorLocation = glGetAttribLocation(dualProgram, "color");
+    ASSERT_NE(-1, colorLocation);
+
+    GLint singlePositionLocation = glGetAttribLocation(singleProgram, "position");
+    ASSERT_NE(-1, singlePositionLocation);
+
+    glUseProgram(singleProgram);
+
+    // Initialize position vertex buffer.
+    const auto &quadVertices = GetQuadVertices();
+
+    GLBuffer vertexBuffer;
+    glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(Vector3) * 6, quadVertices.data(), GL_STATIC_DRAW);
+
+    // Initialize a VAO. Draw with single program.
+    GLVertexArrayOES vertexArray;
+    glBindVertexArrayOES(vertexArray);
+    glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
+    glVertexAttribPointer(singlePositionLocation, 3, GL_FLOAT, GL_FALSE, 0, nullptr);
+    glEnableVertexAttribArray(singlePositionLocation);
+
+    // Should draw red.
+    glDrawArrays(GL_TRIANGLES, 0, 6);
+    ASSERT_GL_NO_ERROR();
+    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);
+
+    // Draw with a green buffer attribute, without the VAO.
+    glBindVertexArrayOES(0);
+    glUseProgram(dualProgram);
+    glVertexAttribPointer(positionLocation, 3, GL_FLOAT, GL_FALSE, 0, nullptr);
+    glEnableVertexAttribArray(positionLocation);
+
+    std::vector<GLColor> greenColors(6, GLColor::green);
+    GLBuffer greenBuffer;
+    glBindBuffer(GL_ARRAY_BUFFER, greenBuffer);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(GLColor) * 6, greenColors.data(), GL_STATIC_DRAW);
+
+    glVertexAttribPointer(colorLocation, 4, GL_UNSIGNED_BYTE, GL_FALSE, 4, nullptr);
+    glEnableVertexAttribArray(colorLocation);
+
+    glDrawArrays(GL_TRIANGLES, 0, 6);
+    ASSERT_GL_NO_ERROR();
+    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
+
+    // Re-bind VAO and try to draw with different program, without changing state.
+    // Should draw black since current value is not initialized.
+    glBindVertexArrayOES(vertexArray);
+    glDrawArrays(GL_TRIANGLES, 0, 6);
+    ASSERT_GL_NO_ERROR();
+    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::black);
+}
+
 // Test that switching VAOs keeps the disabled "current value" attributes up-to-date.
 TEST_P(StateChangeTestES3, VertexArrayObjectAndDisabledAttributes)
 {

src/tests/gl_tests/VertexAttributeTest.cpp

@@ -1071,6 +1071,74 @@ TEST_P(VertexAttributeTestES3, VertexArrayObjectRendering)
     ASSERT_GL_NO_ERROR();
 }
 
+// Tests that rendering works as expected with VAOs.
+// OES_vertex_array_object version
+TEST_P(VertexAttributeTest, VertexArrayObjectRendering)
+{
+    ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_OES_vertex_array_object"));
+
+    constexpr char kVertexShader[] =
+        "attribute vec4 a_position;\n"
+        "attribute vec4 a_color;\n"
+        "varying vec4 v_color;\n"
+        "void main()\n"
+        "{\n"
+        "   gl_Position = a_position;\n"
+        "   v_color = a_color;\n"
+        "}";
+
+    constexpr char kFragmentShader[] =
+        "precision mediump float;\n"
+        "varying vec4 v_color;\n"
+        "void main()\n"
+        "{\n"
+        "    gl_FragColor = v_color;\n"
+        "}";
+
+    ANGLE_GL_PROGRAM(program, kVertexShader, kFragmentShader);
+
+    GLint positionLoc = glGetAttribLocation(program, "a_position");
+    ASSERT_NE(-1, positionLoc);
+    GLint colorLoc = glGetAttribLocation(program, "a_color");
+    ASSERT_NE(-1, colorLoc);
+
+    GLVertexArrayOES vaos[2];
+    GLBuffer positionBuffer;
+    GLBuffer colorBuffers[2];
+
+    const auto &quadVertices = GetQuadVertices();
+
+    glBindVertexArrayOES(vaos[0]);
+    glBindBuffer(GL_ARRAY_BUFFER, positionBuffer);
+    glBufferData(GL_ARRAY_BUFFER, quadVertices.size() * sizeof(Vector3), quadVertices.data(),
+                 GL_STATIC_DRAW);
+    glEnableVertexAttribArray(positionLoc);
+    glVertexAttribPointer(positionLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
+    SetupColorsForUnitQuad(colorLoc, kFloatRed, GL_STREAM_DRAW, &colorBuffers[0]);
+
+    glBindVertexArrayOES(vaos[1]);
+    glBindBuffer(GL_ARRAY_BUFFER, positionBuffer);
+    glEnableVertexAttribArray(positionLoc);
+    glVertexAttribPointer(positionLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
+    SetupColorsForUnitQuad(colorLoc, kFloatGreen, GL_STATIC_DRAW, &colorBuffers[1]);
+
+    glUseProgram(program);
+    ASSERT_GL_NO_ERROR();
+
+    for (int ii = 0; ii < 2; ++ii)
+    {
+        glBindVertexArrayOES(vaos[0]);
+        glDrawArrays(GL_TRIANGLES, 0, 6);
+        EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);
+
+        glBindVertexArrayOES(vaos[1]);
+        glDrawArrays(GL_TRIANGLES, 0, 6);
+        EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
+    }
+
+    ASSERT_GL_NO_ERROR();
+}
+
 // Validate that we can support GL_MAX_ATTRIBS attribs
 TEST_P(VertexAttributeTest, MaxAttribs)
 {

src/tests/test_utils/gl_raii.h

@@ -77,6 +77,11 @@ class GLVertexArray : public GLWrapper
   public:
     GLVertexArray() : GLWrapper(&glGenVertexArrays, &glDeleteVertexArrays) {}
 };
+class GLVertexArrayOES : public GLWrapper
+{
+  public:
+    GLVertexArrayOES() : GLWrapper(&glGenVertexArraysOES, &glDeleteVertexArraysOES) {}
+};
 class GLBuffer : public GLWrapper
 {
   public: