Create a simple buffer sharing example application.
BUG=none
TEST=none
Change-Id: Iab7b42893f413458ca087583473ef8e787b2ddb2
diff --git a/src/buffer-share.c b/src/buffer-share.c
new file mode 100644
index 0000000..44557ef
--- /dev/null
+++ b/src/buffer-share.c
@@ -0,0 +1,419 @@
+/*
+ * Copyright © 2011 Kristian Høgsberg
+ * Copyright © 2011 Benjamin Franzke
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission. The copyright holders make no representations
+ * about the suitability of this software for any purpose. It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#define _GNU_SOURCE /* Needed for O_CLOEXEC */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define EGL_EGLEXT_PROTOTYPES
+#define GL_GLEXT_PROTOTYPES
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <gbm.h>
+#include <GL/gl.h>
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <drm.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+
+struct kms {
+ drmModeConnector *connector;
+ drmModeEncoder *encoder;
+ drmModeModeInfo mode;
+};
+
+static EGLBoolean
+setup_kms(int fd, struct kms *kms)
+{
+ drmModeRes *resources;
+ drmModeConnector *connector;
+ drmModeEncoder *encoder;
+ int i;
+
+ resources = drmModeGetResources(fd);
+ if (!resources) {
+ fprintf(stderr, "drmModeGetResources failed\n");
+ return EGL_FALSE;
+ }
+
+ for (i = 0; i < resources->count_connectors; i++) {
+ connector = drmModeGetConnector(fd, resources->connectors[i]);
+ if (connector == NULL)
+ continue;
+
+ if (connector->connection == DRM_MODE_CONNECTED &&
+ connector->count_modes > 0)
+ break;
+
+ drmModeFreeConnector(connector);
+ }
+
+ if (i == resources->count_connectors) {
+ fprintf(stderr, "No currently active connector found.\n");
+ return EGL_FALSE;
+ }
+
+ for (i = 0; i < resources->count_encoders; i++) {
+ encoder = drmModeGetEncoder(fd, resources->encoders[i]);
+
+ if (encoder == NULL)
+ continue;
+
+ if (encoder->encoder_id == connector->encoder_id)
+ break;
+
+ drmModeFreeEncoder(encoder);
+ }
+
+ kms->connector = connector;
+ kms->encoder = encoder;
+ kms->mode = connector->modes[0];
+
+ return EGL_TRUE;
+}
+
+static void
+render_to_texture(int width, int height)
+{
+ GLfloat rsize = 100;
+ GLfloat x = (width - rsize) / 2.0 ;
+ GLfloat y = (height - rsize) / 2.0;
+
+ glViewport(0, 0, (GLint) width, (GLint) height);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+
+ glOrtho(0, width, 0, height, 1.0, -1.0);
+
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+
+ glClearColor(0.0f, 1.0f, 0.0f, 0.0f);
+ glClear(GL_COLOR_BUFFER_BIT);
+ glColor3f(1.0f, 0.0f, 0.0f);
+
+ glRectf(x, y, x + rsize, y + rsize);
+
+ glFinish();
+}
+
+static void
+render_from_texture(int width, int height)
+{
+ GLfloat x = width / 2.0;
+ GLfloat y = height / 2.0;
+
+ GLfloat Vertices[] =
+ {
+ 0.0f, y, 0.0f,
+ 0.0f, 0.0f, 0.0f,
+ x, 0.0f, 0.0f,
+ x, y, 0.0f
+ };
+ GLfloat TexCoords[] =
+ {
+ 0.0f, 1.0f,
+ 0.0f, 0.0f,
+ 1.0f, 0.0f,
+ 1.0f, 1.0f
+ };
+
+ glViewport(0, 0, (GLint) width, (GLint) height);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+
+ glOrtho(0, width, 0, height, 1.0, -1.0);
+
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glEnableClientState(GL_VERTEX_ARRAY);
+ glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+ glVertexPointer(3, GL_FLOAT, 0, Vertices);
+ glTexCoordPointer(2, GL_FLOAT, 0, TexCoords);
+ glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+ glDisableClientState(GL_VERTEX_ARRAY);
+ glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+
+ glFinish();
+}
+
+static const char device_name[] = "/dev/dri/card0";
+
+static void
+page_flip_handler(int fd, unsigned int frame,
+ unsigned int sec, unsigned int usec, void *data)
+{
+ ;
+}
+
+void quit_handler(int signum)
+{
+ printf("Quitting!\n");
+}
+
+int main(int argc, char *argv[])
+{
+ EGLDisplay dpy;
+ EGLContext ctx;
+ EGLImageKHR image, out_image;
+ EGLint major, minor;
+ const char *extensions;
+ GLuint fb, texture, out_texture;
+ uint32_t handle, stride, fb_id, name;
+ struct kms kms;
+ int ret, fd;
+ struct gbm_device *gbm;
+ struct gbm_bo *bo;
+ drmModeCrtcPtr saved_crtc;
+ time_t start, end;
+ int is_producer = (argc == 1);
+
+ signal (SIGINT, quit_handler);
+
+ fd = open(device_name, O_RDWR | O_CLOEXEC);
+ if (fd < 0) {
+ /* Probably permissions error */
+ fprintf(stderr, "couldn't open %s, skipping\n", device_name);
+ return -1;
+ }
+
+ gbm = gbm_create_device(fd);
+ if (gbm == NULL) {
+ fprintf(stderr, "couldn't create gbm device\n");
+ ret = -1;
+ goto close_fd;
+ }
+
+ dpy = eglGetDisplay(gbm);
+ if (dpy == EGL_NO_DISPLAY) {
+ fprintf(stderr, "eglGetDisplay() failed\n");
+ ret = -1;
+ goto destroy_gbm_device;
+ }
+
+ if (!eglInitialize(dpy, &major, &minor)) {
+ printf("eglInitialize() failed\n");
+ ret = -1;
+ goto egl_terminate;
+ }
+
+ extensions = eglQueryString(dpy, EGL_EXTENSIONS);
+ if (!strstr(extensions, "EGL_KHR_surfaceless_opengl")) {
+ printf("No support for EGL_KHR_surfaceless_opengl\n");
+ ret = -1;
+ goto egl_terminate;
+ }
+
+ if (!setup_kms(fd, &kms)) {
+ ret = -1;
+ goto egl_terminate;
+ }
+
+ eglBindAPI(EGL_OPENGL_API);
+ ctx = eglCreateContext(dpy, NULL, EGL_NO_CONTEXT, NULL);
+ if (ctx == NULL) {
+ fprintf(stderr, "failed to create context\n");
+ ret = -1;
+ goto egl_terminate;
+ }
+
+ if (!eglMakeCurrent(dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, ctx)) {
+ fprintf(stderr, "failed to make context current\n");
+ ret = -1;
+ goto destroy_context;
+ }
+
+ glGenFramebuffers(1, &fb);
+ glBindFramebuffer(GL_FRAMEBUFFER, fb);
+
+ glGenTextures(1, &out_texture);
+ glBindTexture(GL_TEXTURE_2D, out_texture);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+ bo = gbm_bo_create(gbm, kms.mode.hdisplay, kms.mode.vdisplay,
+ GBM_BO_FORMAT_XRGB8888,
+ GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
+ if (bo == NULL) {
+ fprintf(stderr, "failed to create gbm bo\n");
+ ret = -1;
+ goto unmake_current;
+ }
+
+ out_image = eglCreateImageKHR(dpy, NULL, EGL_NATIVE_PIXMAP_KHR, bo, NULL);
+ if (out_image == EGL_NO_IMAGE_KHR) {
+ fprintf(stderr, "failed to create egl image\n");
+ ret = -1;
+ goto destroy_gbm_bo;
+ }
+
+ glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, out_image);
+
+ glFramebufferTexture2D(GL_FRAMEBUFFER,
+ GL_COLOR_ATTACHMENT0,
+ GL_TEXTURE_2D,
+ out_texture, 0);
+
+ if ((ret = glCheckFramebufferStatus(GL_FRAMEBUFFER)) !=
+ GL_FRAMEBUFFER_COMPLETE) {
+ fprintf(stderr, "framebuffer not complete: %x\n", ret);
+ ret = 1;
+ goto destroy_gbm_bo;
+ }
+
+ if (is_producer) {
+ char name_str[sizeof(long) + 1] = { 0 };
+ char stride_str[sizeof(long) + 1] = { 0 };
+
+ eglExportDRMImageMESA(dpy, out_image, &name, NULL, &stride);
+
+ snprintf(name_str, sizeof(name_str), "%d", (int)name);
+ snprintf(stride_str, sizeof(stride_str), "%d", (int)stride);
+
+ render_to_texture(kms.mode.hdisplay, kms.mode.vdisplay);
+
+ drmDropMaster(fd);
+
+ if (!fork())
+ execl(argv[0], argv[0], name_str, stride_str, NULL);
+ else
+ wait(NULL);
+
+ goto destroy_gbm_bo;
+ }
+
+ sscanf(argv[1], "%d", &name);
+ sscanf(argv[2], "%d", &stride);
+
+ EGLint attribs[] = {
+ EGL_WIDTH, kms.mode.hdisplay,
+ EGL_HEIGHT, kms.mode.vdisplay,
+ EGL_DRM_BUFFER_STRIDE_MESA, stride / 4,
+ EGL_DRM_BUFFER_FORMAT_MESA, EGL_DRM_BUFFER_FORMAT_ARGB32_MESA,
+ EGL_NONE
+ };
+
+ image = eglCreateImageKHR(dpy,
+ EGL_NO_CONTEXT,
+ EGL_DRM_BUFFER_MESA,
+ (void *)(intptr_t)(name),
+ attribs);
+
+ if (image == EGL_NO_IMAGE_KHR) {
+ fprintf(stderr, "Failed to import image\n");
+ return;
+ }
+
+ glEnable(GL_TEXTURE_2D);
+
+ glGenTextures(1, &texture);
+ glBindTexture(GL_TEXTURE_2D, texture);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+ glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, image);
+
+ eglExportDRMImageMESA(dpy, out_image, NULL, &handle, &stride);
+
+ render_from_texture(kms.mode.hdisplay, kms.mode.vdisplay);
+
+ ret = drmModeAddFB(fd,
+ kms.mode.hdisplay, kms.mode.vdisplay,
+ 24, 32, stride, handle, &fb_id);
+ if (ret) {
+ fprintf(stderr, "failed to create fb\n");
+ goto destroy_gbm_bo;
+ }
+
+ saved_crtc = drmModeGetCrtc(fd, kms.encoder->crtc_id);
+ if (saved_crtc == NULL)
+ goto rm_fb;
+
+ drmEventContext evctx;
+ fd_set rfds;
+
+ ret = drmModePageFlip(fd, kms.encoder->crtc_id,
+ fb_id, DRM_MODE_PAGE_FLIP_EVENT, 0);
+ if (ret) {
+ fprintf(stderr, "failed to page flip: %m\n");
+ goto free_saved_crtc;
+ }
+
+ FD_ZERO(&rfds);
+ FD_SET(fd, &rfds);
+
+ while (select(fd + 1, &rfds, NULL, NULL, NULL) == -1)
+ NULL;
+
+ memset(&evctx, 0, sizeof evctx);
+ evctx.version = DRM_EVENT_CONTEXT_VERSION;
+ evctx.page_flip_handler = page_flip_handler;
+
+ drmHandleEvent(fd, &evctx);
+
+ sleep(60);
+
+ ret = drmModeSetCrtc(fd, saved_crtc->crtc_id, saved_crtc->buffer_id,
+ saved_crtc->x, saved_crtc->y,
+ &kms.connector->connector_id, 1, &saved_crtc->mode);
+ if (ret) {
+ fprintf(stderr, "failed to restore crtc: %m\n");
+ }
+
+free_saved_crtc:
+ drmModeFreeCrtc(saved_crtc);
+rm_fb:
+ drmModeRmFB(fd, fb_id);
+ eglDestroyImageKHR(dpy, image);
+destroy_gbm_bo:
+ gbm_bo_destroy(bo);
+unmake_current:
+ eglMakeCurrent(dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+destroy_context:
+ eglDestroyContext(dpy, ctx);
+egl_terminate:
+ eglTerminate(dpy);
+destroy_gbm_device:
+ gbm_device_destroy(gbm);
+close_fd:
+ close(fd);
+
+ return ret;
+}