doc/testspecs/GLES3/functional.shaders.int_op.txt

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drawElements Quality Program Test Specification
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Copyright 2014 The Android Open Source Project

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

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distributed under the License is distributed on an "AS IS" BASIS,
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    Integer operator tests

Tests:
 + dEQP-GLES3.functional.shaders.operator.unary_operator.*.*_int_*
 + dEQP-GLES3.functional.shaders.operator.unary_operator.*.*_ivec_*
 + dEQP-GLES3.functional.shaders.operator.unary_operator.*.*_uint_*
 + dEQP-GLES3.functional.shaders.operator.unary_operator.*.*_uvec_*
 + dEQP-GLES3.functional.shaders.operator.binary_operator.*.*_int_*
 + dEQP-GLES3.functional.shaders.operator.binary_operator.*.*_ivec_*
 + dEQP-GLES3.functional.shaders.operator.binary_operator.*.*_uint_*
 + dEQP-GLES3.functional.shaders.operator.binary_operator.*.*_uvec_*

Includes:
 + Integer scalar and vector unary operators:
   - plus
   - minus
   - bitwise not
 + Integer scalar and vector binary operators:
   - add
   - sub
   - mul
   - div
   - mod
   - bitwise and
   - bitwise or
   - bitwise xor
   - less
   - less or equal
   - greater
   - greater or equal
   - equal
   - not equal
 + Scalar-scalar, vector-vector and vector-scalar binary operators
 + Lowp, mediump operands where behaviour is well-defined
 + Highp operands

Excludes:
 + Integer type range and bitlayout verification
   - Will be tested in later type range and storage tests

Description:

Integer test cases use shader rendering test framework. Depending on case type
(vertex or fragment) a single quad or a tight grid of quads is rendered with
the shader program that is being tested. Results are compared against a reference.
Reference image is rendered using a C reference of the shader. A fuzzy comparison
is used to allow small deviations due to fragment input interpolation.

Integer operator test shaders use floating-point attributes or varyings converted
to integers as operands. The value range is chosen based on precision. Results
from the operation are casted back to floating-point values and scaled to range
0..1. The resulting scalar or vector value is then written out as vertex or
fragment color.