Clamp glClearDepthf and glDepthRangef

CONTRIBUTORS

@@ -121,6 +121,7 @@ NVIDIA Corporation
  Kimmo Kinnunen
  Sami Väisänen
  Martin Radev
+ Joonatan Saarhelo
 
 Opera Software ASA
  Daniel Bratell

src/libANGLE/Context.cpp

@@ -4555,7 +4555,7 @@ void Context::clearColor(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha
 
 void Context::clearDepthf(GLfloat depth)
 {
-    mGLState.setDepthClearValue(depth);
+    mGLState.setDepthClearValue(clamp01(depth));
 }
 
 void Context::clearStencil(GLint s)
@@ -4586,7 +4586,7 @@ void Context::depthMask(GLboolean flag)
 
 void Context::depthRangef(GLfloat zNear, GLfloat zFar)
 {
-    mGLState.setDepthRange(zNear, zFar);
+    mGLState.setDepthRange(clamp01(zNear), clamp01(zFar));
 }
 
 void Context::disable(GLenum cap)

src/tests/gl_tests/ClearTest.cpp

@@ -254,6 +254,29 @@ TEST_P(ClearTest, ClearIssue)
     EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
 }
 
+// Regression test for a bug where "glClearDepthf"'s argument was not clamped
+// In GLES 2 they where declared as GLclampf and the behaviour is the same in GLES 3.2
+TEST_P(ClearTest, ClearIsClamped)
+{
+    glClearDepthf(5.0f);
+
+    GLfloat clear_depth;
+    glGetFloatv(GL_DEPTH_CLEAR_VALUE, &clear_depth);
+    EXPECT_EQ(1.0f, clear_depth);
+}
+
+// Regression test for a bug where "glDepthRangef"'s arguments were not clamped
+// In GLES 2 they where declared as GLclampf and the behaviour is the same in GLES 3.2
+TEST_P(ClearTest, DepthRangefIsClamped)
+{
+    glDepthRangef(1.1f, -4.0f);
+
+    GLfloat depth_range[2];
+    glGetFloatv(GL_DEPTH_RANGE, depth_range);
+    EXPECT_EQ(1.0f, depth_range[0]);
+    EXPECT_EQ(0.0f, depth_range[1]);
+}
+
 // Requires ES3
 // This tests a bug where in a masked clear when calling "ClearBuffer", we would
 // mistakenly clear every channel (including the masked-out ones)