Added occlusion query tests.

tests/angle_tests/OcclusionQueriesTest.cpp

+#include "ANGLETest.h"
+
+class OcclusionQueriesTest : public ANGLETest
+{
+protected:
+    OcclusionQueriesTest()
+    {
+        setWindowWidth(128);
+        setWindowHeight(128);
+        setRedBits(8);
+        setGreenBits(8);
+        setBlueBits(8);
+        setAlphaBits(8);
+        setDepthBits(24);
+
+        mProgram = 0;
+    }
+
+    virtual void SetUp()
+    {
+        ANGLETest::SetUp();
+
+        const std::string passthroughVS = SHADER_SOURCE
+        (
+            attribute highp vec4 position;
+            void main(void)
+            {
+                gl_Position = position;
+            }
+        );
+
+        const std::string passthroughPS = SHADER_SOURCE
+        (
+            precision highp float;
+            void main(void)
+            {
+               gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
+            }
+        );
+
+        mProgram = compileProgram(passthroughVS, passthroughPS);
+        if (mProgram == 0)
+        {
+            FAIL() << "shader compilation failed.";
+        }
+    }
+
+    virtual void TearDown()
+    {
+        glDeleteProgram(mProgram);
+
+        ANGLETest::TearDown();
+    }
+
+    GLuint mProgram;
+};
+
+TEST_F(OcclusionQueriesTest, is_occuluded)
+{
+    glDepthMask(GL_TRUE);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+    // draw a quad at depth 0.3
+    glEnable(GL_DEPTH_TEST);
+    glUseProgram(mProgram);
+    drawQuad(mProgram, "position", 0.3f);
+    glUseProgram(0);
+
+    EXPECT_GL_NO_ERROR();
+
+    GLuint query = 0;
+    glGenQueriesEXT(1, &query);
+    glBeginQueryEXT(GL_ANY_SAMPLES_PASSED_EXT, query);
+    drawQuad(mProgram, "position", 0.8f); // this quad should be occluded by first quad
+    glEndQueryEXT(GL_ANY_SAMPLES_PASSED_EXT);
+
+    EXPECT_GL_NO_ERROR();
+
+    swapBuffers();
+
+    GLuint ready = GL_FALSE;
+    while (ready == GL_FALSE)
+    {
+        Sleep(0);
+        glGetQueryObjectuivEXT(query, GL_QUERY_RESULT_AVAILABLE_EXT, &ready);
+    }
+
+    GLuint result = GL_TRUE;
+    glGetQueryObjectuivEXT(query, GL_QUERY_RESULT_EXT, &result);
+
+    EXPECT_GL_NO_ERROR();
+
+    glDeleteQueriesEXT(1, &query);
+
+    EXPECT_EQ(result, GL_FALSE);
+}
+
+TEST_F(OcclusionQueriesTest, is_not_occuluded)
+{
+    glDepthMask(GL_TRUE);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+    EXPECT_GL_NO_ERROR();
+
+    GLuint query = 0;
+    glGenQueriesEXT(1, &query);
+    glBeginQueryEXT(GL_ANY_SAMPLES_PASSED_EXT, query);
+    drawQuad(mProgram, "position", 0.8f); // this quad should not be occluded
+    glEndQueryEXT(GL_ANY_SAMPLES_PASSED_EXT);
+
+    EXPECT_GL_NO_ERROR();
+
+    swapBuffers();
+
+    GLuint result = GL_TRUE;
+    glGetQueryObjectuivEXT(query, GL_QUERY_RESULT_EXT, &result); // will block waiting for result
+
+    EXPECT_GL_NO_ERROR();
+
+    glDeleteQueriesEXT(1, &query);
+
+    EXPECT_EQ(result, GL_TRUE);
+}
+
+TEST_F(OcclusionQueriesTest, errors)
+{
+    glDepthMask(GL_TRUE);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+    EXPECT_GL_NO_ERROR();
+
+    GLuint query = 0;
+    GLuint query2 = 0;
+    glGenQueriesEXT(1, &query);
+
+    EXPECT_EQ(glIsQueryEXT(query), GL_FALSE);
+    EXPECT_EQ(glIsQueryEXT(query2), GL_FALSE);
+
+    glBeginQueryEXT(GL_ANY_SAMPLES_PASSED_EXT, 0); // can't pass 0 as query id
+    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
+
+    glBeginQueryEXT(GL_ANY_SAMPLES_PASSED_EXT, query);
+    glBeginQueryEXT(GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT, query2); // can't initiate a query while one's already active
+    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
+
+    EXPECT_EQ(glIsQueryEXT(query), GL_TRUE);
+    EXPECT_EQ(glIsQueryEXT(query2), GL_FALSE); // have not called begin
+
+    drawQuad(mProgram, "position", 0.8f); // this quad should not be occluded
+    glEndQueryEXT(GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT); // no active query for this target
+    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
+    glEndQueryEXT(GL_ANY_SAMPLES_PASSED_EXT);
+
+    glBeginQueryEXT(GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT, query); // can't begin a query as a different type than previously used
+    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
+
+    glBeginQueryEXT(GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT, query2); // have to call genqueries first
+    EXPECT_EQ(glGetError(), GL_INVALID_OPERATION);
+
+    glGenQueriesEXT(1, &query2);
+    glBeginQueryEXT(GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT, query2); // should be ok now
+    EXPECT_EQ(glIsQueryEXT(query2), GL_TRUE);
+
+    drawQuad(mProgram, "position", 0.3f); // this should draw in front of other quad
+    glDeleteQueriesEXT(1, &query2); // should delete when query becomes inactive
+    glEndQueryEXT(GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT); // should not incur error; should delete query + 1 at end of execution.
+    EXPECT_GL_NO_ERROR();
+
+    swapBuffers();
+
+    EXPECT_GL_NO_ERROR();
+
+    GLuint ready = GL_FALSE;
+    glGetQueryObjectuivEXT(query2, GL_QUERY_RESULT_AVAILABLE_EXT, &ready); // this query is now deleted
+    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
+
+    EXPECT_GL_NO_ERROR();
+}