compositor-drm: Fix multi head rendering

compositor/compositor-drm.c

@@ -59,6 +59,22 @@ struct drm_output {
 	uint32_t current;	
 };
 
+static int
+drm_output_prepare_render(struct wlsc_output *output_base)
+{
+	struct drm_output *output = (struct drm_output *) output_base;
+
+	glFramebufferRenderbuffer(GL_FRAMEBUFFER,
+				  GL_COLOR_ATTACHMENT0,
+				  GL_RENDERBUFFER,
+				  output->rbo[output->current]);
+
+	if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
+		return -1;
+
+	return 0;
+}
+
 static void
 drm_compositor_present(struct wlsc_compositor *ec)
 {
@@ -66,14 +82,12 @@ drm_compositor_present(struct wlsc_compositor *ec)
 	struct drm_output *output;
 
 	wl_list_for_each(output, &ec->output_list, base.link) {
-		output->current ^= 1;
-
-		glFramebufferRenderbuffer(GL_FRAMEBUFFER,
-					  GL_COLOR_ATTACHMENT0,
-					  GL_RENDERBUFFER,
-					  output->rbo[output->current]);
+		if (drm_output_prepare_render(&output->base))
+			continue;
 		glFlush();
 
+		output->current ^= 1;
+
 		drmModePageFlip(c->drm.fd, output->crtc_id,
 				output->fb_id[output->current ^ 1],
 				DRM_MODE_PAGE_FLIP_EVENT, output);
@@ -88,8 +102,13 @@ page_flip_handler(int fd, unsigned int frame,
 	struct wlsc_compositor *compositor = output->compositor;
 	uint32_t msecs;
 
-	msecs = sec * 1000 + usec / 1000;
-	wlsc_compositor_finish_frame(compositor, msecs);
+	/* run synchronized to first output, ignore other pflip events.
+	 * FIXME: support per output/surface frame callbacks */
+	if (output == container_of(compositor->output_list.prev,
+				   struct wlsc_output, link)) {
+		msecs = sec * 1000 + usec / 1000;
+		wlsc_compositor_finish_frame(compositor, msecs);
+	}
 }
 
 static void
@@ -175,7 +194,8 @@ static drmModeModeInfo builtin_1024x768 = {
 static int
 create_output_for_connector(struct drm_compositor *ec,
 			    drmModeRes *resources,
-			    drmModeConnector *connector)
+			    drmModeConnector *connector,
+			    int x, int y)
 {
 	struct drm_output *output;
 	drmModeEncoder *encoder;
@@ -215,7 +235,7 @@ create_output_for_connector(struct drm_compositor *ec,
 	}
 
 	memset(output, 0, sizeof *output);
-	wlsc_output_init(&output->base, &ec->base, 0, 0,
+	wlsc_output_init(&output->base, &ec->base, x, y,
 			 mode->hdisplay, mode->vdisplay, 0);
 
 	ec->crtc_allocator |= (1 << i);
@@ -260,6 +280,8 @@ create_output_for_connector(struct drm_compositor *ec,
 		return -1;
 	}
 
+	output->base.prepare_render = drm_output_prepare_render;
+
 	wl_list_insert(ec->base.output_list.prev, &output->base.link);
 
 	return 0;
@@ -271,6 +293,7 @@ create_outputs(struct drm_compositor *ec, int option_connector)
 	drmModeConnector *connector;
 	drmModeRes *resources;
 	int i;
+	int x = 0, y = 0;
 
 	resources = drmModeGetResources(ec->drm.fd);
 	if (!resources) {
@@ -286,9 +309,13 @@ create_outputs(struct drm_compositor *ec, int option_connector)
 		if (connector->connection == DRM_MODE_CONNECTED &&
 		    (option_connector == 0 ||
 		     connector->connector_id == option_connector))
-			if (create_output_for_connector(ec, resources, connector) < 0)
+			if (create_output_for_connector(ec, resources,
+							connector, x, y) < 0)
 				return -1;
 
+		x += container_of(ec->base.output_list.prev, struct wlsc_output,
+				  link)->width;
+
 		drmModeFreeConnector(connector);
 	}
 

compositor/compositor-wayland.c

@@ -163,19 +163,31 @@ frame_callback(void *data, uint32_t time)
 	wlsc_compositor_finish_frame(&c->base, time);
 }
 
+static int
+wayland_output_prepare_render(struct wlsc_output *output_base)
+{
+	struct wayland_output *output = (struct wayland_output *) output_base;
+	struct wlsc_compositor *ec = output->base.compositor;
+
+	if (!eglMakeCurrent(ec->display, output->egl_surface,
+			    output->egl_surface, ec->context)) {
+		fprintf(stderr, "failed to make current\n");
+		return -1;
+	}
+
+	return 0;
+}
+
 static void
 wayland_compositor_present(struct wlsc_compositor *base)
 {
 	struct wayland_compositor *c = (struct wayland_compositor *) base;
 	struct wayland_output *output;
 
-
 	wl_list_for_each(output, &base->output_list, base.link) {
-		if (!eglMakeCurrent(c->base.display, output->egl_surface,
-				    output->egl_surface, c->base.context)) {
-			fprintf(stderr, "failed to make current\n");
+		if (wayland_output_prepare_render(&output->base))
 			continue;
-		}
+
 		eglSwapBuffers(c->base.display, output->egl_surface);
 	}
 
@@ -230,6 +242,8 @@ wayland_compositor_create_output(struct wayland_compositor *c,
 
 	glClearColor(0, 0, 0, 0.5);
 
+	output->base.prepare_render = wayland_output_prepare_render;
+
 	wl_list_insert(c->base.output_list.prev, &output->base.link);
 
 	return 0;

compositor/compositor-x11.c

@@ -156,6 +156,21 @@ x11_compositor_init_egl(struct x11_compositor *c)
 	return 0;
 }
 
+static int
+x11_output_prepare_render(struct wlsc_output *output_base)
+{
+	struct x11_output *output = (struct x11_output *) output_base;
+	struct wlsc_compositor *ec = output->base.compositor;
+
+	if (!eglMakeCurrent(ec->display, output->egl_surface,
+			    output->egl_surface, ec->context)) {
+		fprintf(stderr, "failed to make current\n");
+		return -1;
+	}
+
+	return 0;
+}
+
 static void
 x11_compositor_present(struct wlsc_compositor *base)
 {
@@ -165,11 +180,9 @@ x11_compositor_present(struct wlsc_compositor *base)
 	uint32_t msec;
 
 	wl_list_for_each(output, &c->base.output_list, base.link) {
-		if (!eglMakeCurrent(c->base.display, output->egl_surface,
-				    output->egl_surface, c->base.context)) {
-			fprintf(stderr, "failed to make current\n");
+		if (x11_output_prepare_render(&output->base))
 			continue;
-		}
+
 		eglSwapBuffers(c->base.display, output->egl_surface);
 	}
 
@@ -324,6 +337,8 @@ x11_compositor_create_output(struct x11_compositor *c, int width, int height)
 		return -1;
 	}
 
+	output->base.prepare_render = x11_output_prepare_render;
+
 	wl_list_insert(c->base.output_list.prev, &output->base.link);
 
 	return 0;

compositor/compositor.c

@@ -24,6 +24,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <stdint.h>
+#include <limits.h>
 #include <stdarg.h>
 #include <sys/ioctl.h>
 #include <fcntl.h>
@@ -493,6 +494,8 @@ wlsc_output_repaint(struct wlsc_output *output)
 	struct wlsc_input_device *eid;
 	pixman_region32_t new_damage, total_damage;
 
+	output->prepare_render(output);
+
 	glViewport(0, 0, output->width, output->height);
 
 	glUniformMatrix4fv(ec->proj_uniform, 1, GL_FALSE, output->matrix.d);
@@ -849,17 +852,40 @@ notify_motion(struct wl_input_device *device, uint32_t time, int x, int y)
 	const struct wl_grab_interface *interface;
 	struct wlsc_input_device *wd = (struct wlsc_input_device *) device;
 	int32_t sx, sy;
-
-	/* FIXME: We need some multi head love here. */
-	output = container_of(ec->output_list.next, struct wlsc_output, link);
-	if (x < output->x)
-		x = 0;
-	if (y < output->y)
-		y = 0;
-	if (x >= output->x + output->width)
-		x = output->x + output->width - 1;
-	if (y >= output->y + output->height)
-		y = output->y + output->height - 1;
+	int x_valid = 0, y_valid = 0;
+	int min_x = INT_MAX, min_y = INT_MAX, max_x = INT_MIN, max_y = INT_MIN;
+
+	wl_list_for_each(output, &ec->output_list, link) {
+		if (output->x <= x && x <= output->x + output->width)
+			x_valid = 1;
+
+		if (output->y <= y && y <= output->y + output->height)
+			y_valid = 1;
+
+		/* FIXME: calculate this only on output addition/deletion */
+		if (output->x < min_x)
+			min_x = output->x;
+		if (output->y < min_y)
+			min_y = output->y;
+
+		if (output->x + output->width > max_x)
+			max_x = output->x + output->width;
+		if (output->y + output->height > max_y)
+			max_y = output->y + output->height;
+	}
+	
+	if (!x_valid) {
+		if (x < min_x)
+			x = min_x;
+		else if (x >= max_x)
+			x = max_x;
+	}
+	if (!y_valid) {
+		if (y < min_y)
+			y = min_y;
+		else  if (y >= max_y)
+			y = max_y;
+	}
 
 	device->x = x;
 	device->y = y;

compositor/compositor.h

@@ -47,6 +47,8 @@ struct wlsc_output {
 	struct wlsc_matrix matrix;
 	int32_t x, y, width, height;
 	pixman_region32_t previous_damage_region;
+
+	int (*prepare_render)(struct wlsc_output *output);
 };
 
 enum wlsc_pointer_type {