1------------------------------------------------------------------------- 2drawElements Quality Program Test Specification 3----------------------------------------------- 4 5Copyright 2014 The Android Open Source Project 6 7Licensed under the Apache License, Version 2.0 (the "License"); 8you may not use this file except in compliance with the License. 9You may obtain a copy of the License at 10 11 http://www.apache.org/licenses/LICENSE-2.0 12 13Unless required by applicable law or agreed to in writing, software 14distributed under the License is distributed on an "AS IS" BASIS, 15WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16See the License for the specific language governing permissions and 17limitations under the License. 18------------------------------------------------------------------------- 19 Occlusion query tests 20 21Tests: 22 + dEQP-GLES3.functional.occlusion_query.* 23 24Includes: 25 + Following occluder types are tested: 26 - Scissor boxes 27 - Depth writes and clears 28 - Stencil writes and clears 29 + Exact occlusion query result verification 30 - For query target ANY_SAMPLES_PASSED 31 + Conservative occlusion query result verification 32 - For query target ANY_SAMPLES_PASSED_CONSERVATIVE 33 34Excludes: 35 36Description: 37 38Occlusion query tests operate using the following steps. First, a number 39of occluders are drawn on screen. Occluders can be areas around scissor 40boxes, depth writes/clears or stencil writes/clears. Second, a number of 41target primitives are drawn in red. If any target is visible, i.e. red 42color appears in the framebuffer, the occlusion query should return true. 43If targets are invisible, i.e. red color does not appear in the 44framebuffer, the occlusion query should return false. If these conditions 45are not met, the test fails. 46 47If the occlusion query target is ANY_SAMPLES_PASSED_CONSERVATIVE, the test 48allows false positives, i.e. the occlusion query can return true even if 49red color is not present in the framebuffer. The converse is not allowed: 50if red color is present in the framebuffer, the query must return true. 51