sync code with last improvements from OpenBSD

dist/libepoxy/test/egl_without_glx.c

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+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/**
+ * @file egl_without_glx.c
+ *
+ * Tries to test operation of the library on a GL stack with EGL and
+ * GLES but no GLX or desktop GL (such as Arm's Mali GLES3 drivers).
+ * This test is varied by the GLES_VERSION defined at compile time to
+ * test either a GLES1-only or a GLES2-only system.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <err.h>
+#include <dlfcn.h>
+#include "epoxy/gl.h"
+#include "epoxy/egl.h"
+
+#include "egl_common.h"
+
+/**
+ * Wraps the system dlopen(), which libepoxy will end up calling when
+ * it tries to dlopen() the API libraries, and errors out the
+ * libraries we're trying to simulate not being installed on the
+ * system.
+ */
+void *
+dlopen(const char *filename, int flag)
+{
+    void * (*dlopen_unwrapped)(const char *filename, int flag);
+
+    if (filename) {
+        if (!strcmp(filename, "libGL.so.1"))
+            return NULL;
+#if GLES_VERSION == 2
+        if (!strcmp(filename, "libGLESv1_CM.so.1"))
+            return NULL;
+#else
+        if (!strcmp(filename, "libGLESv2.so.2"))
+            return NULL;
+#endif
+    }
+
+    dlopen_unwrapped = dlsym(RTLD_NEXT, "dlopen");
+    assert(dlopen_unwrapped);
+
+    return dlopen_unwrapped(filename, flag);
+}
+
+
+static EGLenum last_api;
+static EGLenum extra_error = EGL_SUCCESS;
+
+/**
+ * Override of the real libEGL's eglBindAPI to simulate the target
+ * system's eglBindAPI.
+ */
+static EGLBoolean
+override_eglBindAPI(EGLenum api)
+{
+    void *egl = dlopen("libEGL.so.1", RTLD_LAZY | RTLD_LOCAL);
+    EGLBoolean (*real_eglBindAPI)(EGLenum api) = dlsym(egl, "eglBindAPI");
+
+    last_api = api;
+
+    if (api == EGL_OPENGL_API) {
+        extra_error = EGL_BAD_PARAMETER;
+        return EGL_FALSE;
+    }
+
+    assert(real_eglBindAPI);
+    return real_eglBindAPI(api);
+}
+
+/**
+ * Override of the real libEGL's eglGetError() to feed back the error
+ * that might have been generated by override_eglBindAPI().
+ */
+static EGLint
+override_eglGetError(void)
+{
+    void *egl = dlopen("libEGL.so.1", RTLD_LAZY | RTLD_LOCAL);
+    EGLint (*real_eglGetError)(void) = dlsym(egl, "eglGetError");
+
+    if (extra_error != EGL_SUCCESS) {
+        EGLenum error = extra_error;
+        extra_error = EGL_SUCCESS;
+        return error;
+    }
+
+    assert(real_eglGetError);
+    return real_eglGetError();
+}
+
+int
+main(int argc, char **argv)
+{
+    bool pass = true;
+    EGLDisplay *dpy = get_egl_display_or_skip();
+    EGLint context_attribs[] = {
+        EGL_CONTEXT_CLIENT_VERSION, GLES_VERSION,
+        EGL_NONE
+    };
+    EGLConfig cfg;
+    EGLint config_attribs[] = {
+	EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+	EGL_RED_SIZE, 1,
+	EGL_GREEN_SIZE, 1,
+	EGL_BLUE_SIZE, 1,
+	EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
+	EGL_NONE
+    };
+    EGLint count;
+    EGLContext ctx;
+    const unsigned char *string;
+
+    epoxy_eglBindAPI = override_eglBindAPI;
+    epoxy_eglGetError = override_eglGetError;
+
+    if (!epoxy_has_egl_extension(dpy, "EGL_KHR_surfaceless_context"))
+        errx(77, "Test requires EGL_KHR_surfaceless_context");
+
+    eglBindAPI(EGL_OPENGL_ES_API);
+
+    if (!eglChooseConfig(dpy, config_attribs, &cfg, 1, &count))
+        errx(77, "Couldn't get an EGLConfig\n");
+
+    ctx = eglCreateContext(dpy, cfg, NULL, context_attribs);
+    if (!ctx)
+        errx(77, "Couldn't create a GLES%d context\n", GLES_VERSION);
+
+    eglMakeCurrent(dpy, NULL, NULL, ctx);
+
+    string = glGetString(GL_VERSION);
+    printf("GL_VERSION: %s\n", string);
+
+    assert(eglGetError() == EGL_SUCCESS);
+
+    return pass != true;
+}