doc/testspecs/GLES2/functional.scissors.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

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
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    Scissoring Tests

Tests:
 + dEQP-GLES2.functional.scissor.*
 + dEQP-GLES3.functional.scissor.*

Includes:
 + Primitives
   - Points
   - Lines
   - Triangles
 + Clears (including GLES 3 only ones)
 + Framebuffer blits (GLES 3)
 + Scissor configurations
   - Enclosing rendered area
   - Enclosed by rendered area (if applicable)
   - Partially containing rendered area
   - (Partially) outside render target


Excludes:
 + Blits to/from multiple buffers
 + Partially clipped points

Description:

This test set compares images rendered by the target with the scissor test
enabled to references generated with the scissor test disabled but with
areas outside the scissor rectangle cleared by the test logic.

All primitive types are tested in all reasonable scissor configurations
listed above. Points are tested in a somewhat limited fashion since
support for point sizes above one is not required.

After clearing with scissoring enabled, depth and stencil clears disable
scissoring and render a colored fullscreen quad with depth & stencil
tests requiring values set by the previous clears to produce the final output.