From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org Subject: [Bug 109330] New: GL_ALPHA_BITS set to non-zero with EGL_PLATFORM_GBM_MESA Date: Sat, 12 Jan 2019 13:59:45 +0000 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0119796607==" Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: nouveau-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Sender: "Nouveau" To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org List-Id: nouveau.vger.kernel.org --===============0119796607== Content-Type: multipart/alternative; boundary="15473015860.7C5a6cc.15896" Content-Transfer-Encoding: 7bit --15473015860.7C5a6cc.15896 Date: Sat, 12 Jan 2019 13:59:46 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated https://bugs.freedesktop.org/show_bug.cgi?id=3D109330 Bug ID: 109330 Summary: GL_ALPHA_BITS set to non-zero with EGL_PLATFORM_GBM_MESA Product: Mesa Version: unspecified Hardware: Other OS: All Status: NEW Severity: normal Priority: medium Component: Drivers/DRI/nouveau Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Reporter: contact-sV0wSBM+kKVWj0EZb7rXcA@public.gmane.org QA Contact: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org When creating an EGL context with EGL_PLATFORM_GBM_MESA and EGL_ALPHA_SIZE= =3D1, Nouveau produces completely transparent images when using glReadPixels. Note that my code works with other drivers (i915, amdgpu), only Nouveau is affec= ted. How to reproduce: 1. Create an EGL context with these attribs: static const EGLint config_attribs[] =3D { EGL_RED_SIZE, 1, EGL_GREEN_SIZE, 1, EGL_BLUE_SIZE, 1, EGL_ALPHA_SIZE, 1, EGL_NONE, }; Set platform to EGL_PLATFORM_GBM_MESA and visual to GBM_FORMAT_ARGB8888. 2. Try to get the alpha size: eglGetConfigAttrib(EGL_ALPHA_SIZE) glGetIntegerv(GL_ALPHA_BITS) Both return 8, meaning an alpha channel is present. 3. Try to read pixels with glReadPixels and GL_BGRA_EXT. The resulting image has an alpha channel which sets the pixels to be completely transparent. Editing the image with gimp reveals that inverting the alpha channel makes = the image correct. Software is wlroots [1] with grim [2]. To reproduce, compile both, start rootston, run grim. Let me know if you need more info. [1]: https://github.com/swaywm/wlroots [2]: https://github.com/emersion/grim --=20 You are receiving this mail because: You are the QA Contact for the bug. You are the assignee for the bug.= --15473015860.7C5a6cc.15896 Date: Sat, 12 Jan 2019 13:59:46 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated
Bug ID 109330
Summary GL_ALPHA_BITS set to non-zero with EGL_PLATFORM_GBM_MESA
Product Mesa
Version unspecified
Hardware Other
OS All
Status NEW
Severity normal
Priority medium
Component Drivers/DRI/nouveau
Assignee nouveau@lists.freedesktop.org
Reporter contact@emersion.fr
QA Contact nouveau@lists.freedesktop.org 

When creating an EGL context with EGL_PLATFORM_GBM_MESA and EG=
L_ALPHA_SIZE=3D1,
Nouveau produces completely transparent images when using glReadPixels. Note
that my code works with other drivers (i915, amdgpu), only Nouveau is affec=
ted.

How to reproduce:

1. Create an EGL context with these attribs:

static const EGLint config_attribs[] =3D {
        EGL_RED_SIZE, 1,
        EGL_GREEN_SIZE, 1,
        EGL_BLUE_SIZE, 1,
        EGL_ALPHA_SIZE, 1,
        EGL_NONE,
};

Set platform to EGL_PLATFORM_GBM_MESA and visual to GBM_FORMAT_ARGB8888.

2. Try to get the alpha size:

eglGetConfigAttrib(EGL_ALPHA_SIZE)
glGetIntegerv(GL_ALPHA_BITS)

Both return 8, meaning an alpha channel is present.

3. Try to read pixels with glReadPixels and GL_BGRA_EXT. The resulting image
has an alpha channel which sets the pixels to be completely transparent.
Editing the image with gimp reveals that inverting the alpha channel makes =
the
image correct.

Software is wlroots [1] with grim [2]. To reproduce, compile both, start
rootston, run grim. Let me know if you need more info.

[1]: https://github.com/swayw=
m/wlroots
[2]: https://github.com/emersi=
on/grim

You are receiving this mail because:
  • You are the QA Contact for the bug.
  • You are the assignee for the bug.
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