| Bug ID | 103575 |
|---|---|
| Summary | eglQueryDevicesEXT returns 0 devices |
| Product | Mesa |
| Version | 17.2 |
| Hardware | x86-64 (AMD64) |
| OS | Linux (All) |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | Drivers/Gallium/r600 |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | Hi-Angel@yandex.ru |
| QA Contact | dri-devel@lists.freedesktop.org |
I'm following this guide https://devblogs.nvidia.com/parallelforall/egl-eye-opengl-visualization-without-x-server/ to choose a GPU through native means of EGL. Using eglQueryDevicesEXT() in both modes, i.e. with "devices" array to get descriptions, as well as by passing 0 as "devices", results in 0 as a number of supported devices. Specification says that I should've get at least 1 (and I actually have two, r600g-managed, cards): https://www.khronos.org/registry/EGL/extensions/EXT/EGL_EXT_device_enumeration.txt > EGL devices can be enumerated before EGL is initialized. Use: > > EGLBoolean eglQueryDevicesEXT(EGLint max_devices, > EGLDeviceEXT *devices, > EGLint *num_devices); [SNIP] > If <devices> is NULL, then <max_devices> will be ignored, no devices will be > returned in <devices>, and <num_devices> will be set to the number of > supported devices in the system. All implementations must support at least > one device. > > On failure, EGL_FALSE is returned. Below is the modified code I'm using: #include <EGL/egl.h> #include <EGL/eglext.h> #include <stdio.h> int main(int argc, char *argv[]) { EGLint numDevices; PFNEGLQUERYDEVICESEXTPROC eglQueryDevicesEXT = (PFNEGLQUERYDEVICESEXTPROC) eglGetProcAddress("eglQueryDevicesEXT"); if (eglQueryDevicesEXT(2, 0, &numDevices) == EGL_FALSE) { puts("error in eglQueryDevicesEXT"); return 1; } printf("Detected %d devices\n", numDevices); }
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