WebGL validation for depthRange.

src/libANGLE/validationES2.cpp

@@ -4015,4 +4015,15 @@ bool ValidateVertexAttribPointer(ValidationContext *context,
     return true;
 }
 
+bool ValidateDepthRangef(ValidationContext *context, GLclampf zNear, GLclampf zFar)
+{
+    if (context->getExtensions().webglCompatibility && zNear > zFar)
+    {
+        context->handleError(Error(GL_INVALID_OPERATION, "Depth near > far."));
+        return false;
+    }
+
+    return true;
+}
+
 }  // namespace gl

src/libANGLE/validationES2.h

@@ -380,6 +380,8 @@ bool ValidateVertexAttribPointer(ValidationContext *context,
                                  GLsizei stride,
                                  const GLvoid *ptr);
 
+bool ValidateDepthRangef(ValidationContext *context, GLclampf zNear, GLclampf zFar);
+
 }  // namespace gl
 
 #endif // LIBANGLE_VALIDATION_ES2_H_

src/libGLESv2/entry_points_gles_2_0.cpp

@@ -687,6 +687,11 @@ void GL_APIENTRY DepthRangef(GLclampf zNear, GLclampf zFar)
     Context *context = GetValidGlobalContext();
     if (context)
     {
+        if (!context->skipValidation() && !ValidateDepthRangef(context, zNear, zFar))
+        {
+            return;
+        }
+
         context->depthRangef(zNear, zFar);
     }
 }

src/tests/gl_tests/WebGLCompatibilityTest.cpp

@@ -423,6 +423,19 @@ TEST_P(WebGLCompatibilityTest, DrawElementsBufferOutOfBoundsInIndexBuffer)
     ASSERT_GL_NO_ERROR();
 }
 
+// Test depth range with 'near' more or less than 'far.'
+TEST_P(WebGLCompatibilityTest, DepthRange)
+{
+    glDepthRangef(0, 1);
+    ASSERT_GL_NO_ERROR();
+
+    glDepthRangef(.5, .5);
+    ASSERT_GL_NO_ERROR();
+
+    glDepthRangef(1, 0);
+    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
+}
+
 // Test the checks for OOB reads in the vertex buffers, instanced version
 TEST_P(WebGL2CompatibilityTest, DrawArraysBufferOutOfBoundsInstanced)
 {