git.zerfleddert.de Git - m1-debian/blame_incremental

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Commit	Line	Data
	1	// based on
	2	// https://www.khronos.org/registry/EGL/extensions/MESA/EGL_MESA_platform_gbm.txt
	3
	4	#include <stdio.h>
	5	#include <stdlib.h>
	6	#include <string.h>
	7	#include <unistd.h>
	8
	9	#include <sys/types.h>
	10	#include <sys/stat.h>
	11	#include <fcntl.h>
	12
	13	#include <gbm.h>
	14	#include <EGL/egl.h>
	15	#include <EGL/eglext.h>
	16	#include <GLES2/gl2.h>
	17
	18	struct my_display {
	19	struct gbm_device *gbm;
	20	EGLDisplay egl;
	21	};
	22
	23	struct my_config {
	24	struct my_display dpy;
	25	EGLConfig egl;
	26	};
	27
	28	struct my_window {
	29	struct my_config config;
	30	struct gbm_surface *gbm;
	31	EGLSurface egl;
	32	};
	33
	34	PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT;
	35	PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC createPlatformWindowSurfaceEXT;
	36
	37	static void
	38	check_extensions(void)
	39	{
	40	const char *client_extensions = eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS);
	41
	42	if (!client_extensions) {
	43	abort();
	44	}
	45	if (!strstr(client_extensions, "EGL_MESA_platform_gbm")) {
	46	abort();
	47	}
	48
	49	if (!strstr(client_extensions, "EGL_EXT_platform_base")) {
	50	abort();
	51	}
	52
	53	getPlatformDisplayEXT =
	54	(void *) eglGetProcAddress("eglGetPlatformDisplayEXT");
	55	createPlatformWindowSurfaceEXT =
	56	(void *) eglGetProcAddress("eglCreatePlatformWindowSurfaceEXT");
	57
	58	}
	59
	60	static struct my_display
	61	get_display(void)
	62	{
	63	struct my_display dpy;
	64	EGLint major, minor;
	65
	66	int fd = open("/dev/dri/card0", O_RDWR \| FD_CLOEXEC);
	67	if (fd < 0)
	68	abort();
	69
	70	dpy.gbm = gbm_create_device(fd);
	71	if (!dpy.gbm)
	72	abort();
	73
	74	dpy.egl = getPlatformDisplayEXT(EGL_PLATFORM_GBM_MESA, dpy.gbm, NULL);
	75
	76	if (dpy.egl == EGL_NO_DISPLAY)
	77	abort();
	78
	79	if (eglInitialize(dpy.egl, &major, &minor))
	80	printf ("EGL %d.%d\n", major, minor);
	81	else
	82	abort();
	83
	84	return dpy;
	85	}
	86
	87	static struct my_config
	88	get_config(struct my_display dpy)
	89	{
	90	struct my_config config = {
	91	.dpy = dpy,
	92	};
	93
	94	EGLint egl_config_attribs[] = {
	95	EGL_BUFFER_SIZE, 32,
	96	EGL_DEPTH_SIZE, EGL_DONT_CARE,
	97	EGL_STENCIL_SIZE, EGL_DONT_CARE,
	98	EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
	99	EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
	100	EGL_NONE,
	101	};
	102
	103	EGLint num_configs;
	104	if (!eglGetConfigs(dpy.egl, NULL, 0, &num_configs))
	105	abort();
	106
	107	EGLConfig configs = malloc(num_configs sizeof(EGLConfig));
	108	if (!eglChooseConfig(dpy.egl, egl_config_attribs,
	109	configs, num_configs, &num_configs)) {
	110	abort();
	111	}
	112	if (num_configs == 0)
	113	abort();
	114
	115	for (int i = 0; i < num_configs; ++i) {
	116	EGLint gbm_format;
	117	struct gbm_format_name_desc desc;
	118
	119	if (!eglGetConfigAttrib(dpy.egl, configs[i],
	120	EGL_NATIVE_VISUAL_ID, &gbm_format)) {
	121	abort();
	122	}
	123
	124	printf ("found gbm_format: %s\n", gbm_format_get_name (gbm_format, &desc));
	125	if (gbm_format == GBM_FORMAT_ARGB8888) {
	126	config.egl = configs[i];
	127	free(configs);
	128	return config;
	129	}
	130	}
	131
	132	// no egl config matching gbm format
	133	abort();
	134	}
	135
	136	static struct my_window
	137	get_window(struct my_config config)
	138	{
	139	struct my_window window = {
	140	.config = config,
	141	};
	142
	143	window.gbm = gbm_surface_create(config.dpy.gbm,
	144	256, 256,
	145	GBM_FORMAT_XRGB8888,
	146	GBM_BO_USE_RENDERING);
	147	if (!window.gbm)
	148	abort();
	149
	150	window.egl = createPlatformWindowSurfaceEXT(config.dpy.egl,
	151	config.egl,
	152	window.gbm,
	153	NULL);
	154	if (window.egl == EGL_NO_SURFACE)
	155	abort();
	156
	157	return window;
	158	}
	159
	160	int
	161	main(void)
	162	{
	163	check_extensions();
	164
	165	struct my_display dpy = get_display();
	166	struct my_config config = get_config(dpy);
	167	struct my_window window = get_window(config);
	168	EGLContext context;
	169
	170	context = eglCreateContext(dpy.egl, config.egl, EGL_NO_CONTEXT, NULL);
	171	eglMakeCurrent(dpy.egl, window.egl, window.egl, context);
	172
	173	/* just so we have some gles symbols too */
	174	glClearColor(1.0, 1.0, 1.0, 1.0);
	175	glClear(GL_COLOR_BUFFER_BIT);
	176	glFlush();
	177
	178	return EXIT_SUCCESS;
	179	}