1 ------------------------------------------------------------------------- 2 drawElements Quality Program Test Specification 3 ----------------------------------------------- 4 5 Copyright 2014 The Android Open Source Project 6 7 Licensed under the Apache License, Version 2.0 (the "License"); 8 you may not use this file except in compliance with the License. 9 You may obtain a copy of the License at 10 11 http://www.apache.org/licenses/LICENSE-2.0 12 13 Unless required by applicable law or agreed to in writing, software 14 distributed under the License is distributed on an "AS IS" BASIS, 15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 See the License for the specific language governing permissions and 17 limitations under the License. 18 ------------------------------------------------------------------------- 19 gl_FragDepth tests 20 21 Tests: 22 + dEQP-GLES3.functional.shaders.fragdepth.* 23 24 Includes: 25 + gl_FragDepth usage in following scenarios: 26 - Unconditional write 27 - Conditional write 28 - Write in loop 29 - Write in user-defined function 30 - Discard before and after write 31 + Depth comparison with gl_FragDepth write 32 + gl_FragDepth use when rendering triangles 33 34 Excludes: 35 + Depth value conversion accuracy tests 36 + gl_FragDepth use when rendering points and lines 37 38 Description: 39 40 For comparison cases depth buffer is first initialized by rendering 41 two adjecent quads. Left one will fill depth buffer with constant value, 42 while right quad fills with value that is interpolated in range 0..1. 43 Color buffer is filled with blue color. 44 Single quad with a selected shader and depth comparison mode is rendered. 45 Where depth test passes, green value will be written to color buffer. 46 47 For depth write-only cases the selected shader is used to initialize 48 the depth buffer by rendering a simple quad. After that depth buffer 49 is visualized by rendering multiple viewport-sized quads with a different 50 colors and depth values in such manner that each depth range slice 51 will end up showing in color buffer with a distinct color. 52 53 In both test types rendered image is compared against a reference image 54 produced by a reference renderer. 55
