# HG changeset patch
# User Eleni Maria Stea <eleni@mutantstargoat.com>
# Date 1530731783 -10800
# Node ID 665119a0580e16ec90e4785f264af8b5a27f5dad

example program that uses gbm buffers

diff -r 000000000000 -r 665119a0580e Makefile
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Makefile	Wed Jul 04 22:16:23 2018 +0300
@@ -0,0 +1,21 @@
+src = $(wildcard src/*.cc)
+obj = $(src:.cc=.o)
+dep = $(obj:.o=.d)
+bin = test
+
+dbg = -g
+opt = -O0
+inc = -Isrc -I/usr/lib/i386-linux-gnu
+
+CXX = g++
+CXXFLAGS = -pedantic -Wall $(dbg) $(opt) $(inc) `sdl2-config --cflags` `pkg-config --cflags libdrm`
+LDFLAGS = `sdl2-config --libs` -lGLESv2 -lgbm -lEGL -ldrm -ludev
+
+$(bin): $(obj)
+		  $(CXX) -o $@ $(obj) $(LDFLAGS)
+
+-include $(dep)
+
+.PHONY: clean
+clean:
+	rm -f $(obj) $(bin)
diff -r 000000000000 -r 665119a0580e src/drmtest.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/drmtest.cc	Wed Jul 04 22:16:23 2018 +0300
@@ -0,0 +1,131 @@
+/*
+ * Copyright © 2007 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.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+#include <string.h>
+
+#include <fcntl.h>
+#include <fnmatch.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include "drmtest.h"
+
+#define LIBUDEV_I_KNOW_THE_API_IS_SUBJECT_TO_CHANGE
+#include <libudev.h>
+
+static int is_master(int fd)
+{
+	drm_client_t client;
+	int ret;
+
+	/* Check that we're the only opener and authed. */
+	client.idx = 0;
+	ret = ioctl(fd, DRM_IOCTL_GET_CLIENT, &client);
+	assert (ret == 0);
+	if (!client.auth)
+		return 0;
+	client.idx = 1;
+	ret = ioctl(fd, DRM_IOCTL_GET_CLIENT, &client);
+	if (ret != -1 || errno != EINVAL)
+		return 0;
+
+	return 1;
+}
+
+/** Open the first DRM device matching the criteria */
+int drm_open_matching(const char *pci_glob, int flags)
+{
+	struct udev *udev;
+	struct udev_enumerate *e;
+	struct udev_device *device, *parent;
+        struct udev_list_entry *entry;
+	const char *pci_id, *path;
+	int fd;
+
+	udev = udev_new();
+	if (udev == NULL) {
+		fprintf(stderr, "failed to initialize udev context\n");
+		abort();
+	}
+
+	fd = -1;
+	e = udev_enumerate_new(udev);
+	udev_enumerate_add_match_subsystem(e, "drm");
+        udev_enumerate_scan_devices(e);
+        udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
+		path = udev_list_entry_get_name(entry);
+		device = udev_device_new_from_syspath(udev, path);
+		parent = udev_device_get_parent(device);
+		/* Filter out KMS output devices. */
+		if (strcmp(udev_device_get_subsystem(parent), "pci") != 0)
+			continue;
+		pci_id = udev_device_get_property_value(parent, "PCI_ID");
+		if (fnmatch(pci_glob, pci_id, 0) != 0)
+			continue;
+		fd = open(udev_device_get_devnode(device), O_RDWR);
+		if (fd < 0)
+			continue;
+		if ((flags & DRM_TEST_MASTER) && !is_master(fd)) {
+			close(fd);
+			fd = -1;
+			continue;
+		}
+
+		break;
+	}
+        udev_enumerate_unref(e);
+	udev_unref(udev);
+
+	return fd;
+}
+
+int drm_open_any(void)
+{
+	int fd = drm_open_matching("*:*", 0);
+
+	if (fd < 0) {
+		fprintf(stderr, "failed to open any drm device\n");
+		abort();
+	}
+
+	return fd;
+}
+
+/**
+ * Open the first DRM device we can find where we end up being the master.
+ */
+int drm_open_any_master(void)
+{
+	int fd = drm_open_matching("*:*", DRM_TEST_MASTER);
+
+	if (fd < 0) {
+		fprintf(stderr, "failed to open any drm device\n");
+		abort();
+	}
+
+	return fd;
+
+}
diff -r 000000000000 -r 665119a0580e src/drmtest.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/drmtest.h	Wed Jul 04 22:16:23 2018 +0300
@@ -0,0 +1,40 @@
+/*
+ * Copyright © 2007 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.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <assert.h>
+#include <errno.h>
+
+#include <xf86drm.h>
+
+#define DRM_TEST_MASTER 0x01
+
+int drm_open_any(void);
+int drm_open_any_master(void);
+int drm_open_matching(const char *pci_glob, int flags);
diff -r 000000000000 -r 665119a0580e src/test.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/test.cc	Wed Jul 04 22:16:23 2018 +0300
@@ -0,0 +1,115 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <SDL2/SDL.h>
+#include <GLES2/gl2.h>
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <EGL/eglplatform.h>
+#include <KHR/khrplatform.h>
+#include <gbm.h>
+
+#include <fcntl.h>
+#include <fnmatch.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <assert.h>
+#include <errno.h>
+#include <libudev.h>
+
+#include "drmtest.h"
+
+int fd = -1;
+static struct gbm_device *gbm_dev;
+struct gbm_bo *bo;
+struct gbm_surface *gbm_surf;
+
+int main(int argc, char **argv)
+{
+//	if((fd = open("/dev/dri/card0", O_RDWR) == -1)) {
+//		fprintf(stderr, "can't open device: %s\n", strerror(errno));
+//		exit(1);
+//	}
+	if((fd = drm_open_any()) == - 1) {
+		fprintf(stderr, "can't open device: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	printf("fd: %d\n", fd);
+
+	if(!(gbm_dev = gbm_create_device(fd))) {
+		fprintf(stderr, "can't create gbm device: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	if(!(gbm_surf = gbm_surface_create(gbm_dev, 640, 480,  GBM_BO_FORMAT_XRGB8888, GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING))) {
+		fprintf(stderr, "can't create gbm surface: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	EGLDisplay dpy;
+	dpy = eglGetDisplay((_XDisplay*)gbm_dev);
+	EGLint major, minor;
+
+	//const char *ver;
+	const char *extensions;
+	eglInitialize(dpy, &major, &minor);
+	//ver = eglQueryString(dpy, EGL_VERSION);
+	extensions = eglQueryString(dpy, EGL_EXTENSIONS);
+
+	if (!strstr(extensions, "EGL_KHR_surfaceless_context")) {
+		fprintf(stderr, "no surfaceless support, cannot initialize\n");
+		exit(1);
+	}
+
+	SDL_Window *win;
+	SDL_GLContext ctx;
+
+	if(SDL_Init(SDL_INIT_VIDEO) == -1) {
+		fprintf(stderr, "failed to initialize sdl\n");
+		return 1;
+	}
+
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_EGL, 1);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+	SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
+	SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
+	SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
+	SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
+	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+	//SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
+
+	if(!(bo = gbm_bo_create(gbm_dev, 640, 480, GBM_BO_FORMAT_XRGB8888, GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING))) {
+		fprintf(stderr, "Unable to create gbm buffer object!\n");
+	}
+
+	win = SDL_CreateWindow("foo", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480,
+			SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN);
+
+	if(!win) {
+		fprintf(stderr, "failed to create window: %s\n", SDL_GetError());
+		return 1;
+	}
+
+	if(!(ctx = SDL_GL_CreateContext(win))) {
+		fprintf(stderr, "failed to create OpenGL context: %s\n", SDL_GetError());
+		return 1;
+	}
+
+	glClearColor(1.0, 0.0, 0.0, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	SDL_GL_SwapWindow(win);
+	SDL_Delay(5000);
+
+	gbm_device_destroy(gbm_dev);
+	SDL_GL_DeleteContext(win);
+	SDL_DestroyWindow(win);
+	SDL_Quit();
+	return 0;
+}