Comment on attachment 142750 [details]
EGL pbuffer test

>#include <stdio.h>
>#include <stdint.h>
>#include <stdlib.h>
>#include <string.h>
>#include <EGL/egl.h>
>
>#include <GL/gl.h>
>
>#define WIDTH 4
>#define HEIGHT 4
>
>int main(int argc, char *argv[])
>{
>    int gles = argc > 1 ? !strcmp(argv[1], "-es") : 0;
>
>    EGLDisplay egl_dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
>    if (!egl_dpy)
>        return -1;
>
>    EGLint major, minor;
>    int ret = eglInitialize(egl_dpy, &major, &minor);
>    if (!ret)
>        return -1;
>
>    const EGLint attribs[] = {
>        EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
>        EGL_RENDERABLE_TYPE, gles ? EGL_OPENGL_ES_BIT : EGL_OPENGL_BIT,
>        EGL_BLUE_SIZE, 8,
>        EGL_GREEN_SIZE, 8,
>        EGL_RED_SIZE, 8,
>        EGL_NONE
>    };
>    EGLint nb_configs;
>    EGLConfig egl_cfg;
>    ret = eglChooseConfig(egl_dpy, attribs, &egl_cfg, 1, &nb_configs);
>    if (!ret)
>        return -1;
>
>    eglBindAPI(gles ? EGL_OPENGL_ES_API : EGL_OPENGL_API);
>
>    EGLContext egl_ctx = eglCreateContext(egl_dpy, egl_cfg, EGL_NO_CONTEXT, NULL);
>    if (!egl_ctx)
>        return -1;
>
>    const EGLint pbuffer_attribs[] = {
>        EGL_WIDTH, WIDTH,
>        EGL_HEIGHT, HEIGHT,
>        EGL_NONE,
>    };
>    EGLSurface egl_surface = eglCreatePbufferSurface(egl_dpy, egl_cfg, pbuffer_attribs);
>    if (!egl_surface)
>        return -1;
>
>    ret = eglMakeCurrent(egl_dpy, egl_surface, egl_surface, egl_ctx);
>    if (!ret)
>        return -1;
>
>    uint8_t *data = calloc(1, 4 * WIDTH * HEIGHT);
>    if (!data)
>        return -1;
>
>    glClearColor(1.0, 0.0, 0.0, 1.0);
>    glClear(GL_COLOR_BUFFER_BIT);
>    glReadPixels(0, 0, WIDTH, HEIGHT, GL_RGBA, GL_UNSIGNED_BYTE, data);
>
>    for(int y = 0; y < HEIGHT; y++) {
>        for(int x = 0; x < WIDTH; x++) {
>            int *color = (int *)data + x*y;

Should be int *color = (int *)data + y*WIDTH + x;

>            printf("0x%8x ", *color);
>        }
>        printf("\n");
>    }
>    free(data);
>
>    eglTerminate(egl_dpy);
>    return 0;
>}

FWIW I couldn't reproduce this with Haswell or Skylake machines (using mesa 19.0.0-devel).

Using Mesa 18.2.6, the frame is black instead of garbled (0xff000000 instead of 0xff0000ff for all pixels).

Hmm yep, I'm able to reproduce this after all.

I've checked for possible regressions in dEQP-EGL suite (that has a lot of clear surface related tests), it seems all of those are passing but I assume they all use gles1, gles2 or gles3.x so this is something specific to OpenGL. Will continue investigation.

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