Created attachment 121579 [details]
Source code of the test program. Needs SDL2 to build. It shows a red background
if the describes bug exists.
The OpenGL-Wiki says, the function should return "GL_FALSE if none of the
scoped drawing commands generate samples that pass the depth test; otherwise,
the value is GL_TRUE". Source: https://www.opengl.org/wiki/Query_Object
When calling glGetQueryObjecti64v on r600 or nouveau (probably on any gallium
driver) however, it returns the number of samples which passed the depth test.
This would be correct behaviour if the argument was GL_SAMPLES_PASSED instead
of GL_ANY_SAMPLES_PASSED.
I have attached the source code of a simple example program. It worked
correctly on the following platforms:
- Arch Linux with Intel Ivy Bridge graphics (Mesa 11.1.1-1)
- Windows 7 with the same Intel graphics
- Windows 7 with Nvidia GeForce GT 640M
- Windows 7 with ATI Radeon HD 5670
It showed incorrect behaviour on these systems:
- Arch Linux with Nouveau and GeForce GT 640M (Mesa 11.1.1-1)
- Manjaro with r600 and Radeon HD 5670 (Mesa 11.1.1-1)
Note that the bugtracker does not allow me to specify 11.1 as mesa version.