https://bugs.freedesktop.org/show_bug.cgi?id=99919
Bug ID: 99919
Summary: Wrong and unstable image rendering from GLSL fragment
shaders
Product: Mesa
Version: 17.0
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
Created attachment 129862
--> https://bugs.freedesktop.org/attachment.cgi?id=129862&action=edit
Archive with pair of shaders and their expected renderings
Steps to Reproduce:
-------------------------------
1. Obtain and build the latest release of get-image, a simple tool that
creates a .png image from a fragment shader
https://github.com/mc-imperial/get-image
2. From a terminal, execute:
/path/to/get_image/linux_out/install/bin/get_image original.frag
This will create output.png, which should look like original.png
3. From a terminal, execute:
/path/to/get_image/linux_out/install/bin/get_image variant.frag
This will create output.png, which should look like variant.png
Expected Results:
-------------------------------
Both shaders should render an image that looks like original.png. This
is because the only difference between the .frag files is:
- a for loop of 1 iteration
- inside this loop, a "if" which condition is sure to be false at
runtime (we control the value of injectionSwitch to ensure this)
Actual Results:
-------------------------------
The shaders render completely different images, which they should not.
Moreover, the variant.frag file rendering seems unstable, i.e. it does
not always render the same image, but it always renders an image
different from the expected one.
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