/*
 * Copyright © 2012 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.
 *
 *
 * Author:
 *   Armin Reese <armin.c.reese@intel.com>
 */

/*
 * This program is intended for testing sprite functionality.
 */
#include <assert.h>
#include <errno.h>
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <termios.h>
#include <sys/time.h>
#include <sys/poll.h>
#include <sys/time.h>
#include <sys/mman.h>
#include <sys/ioctl.h>

#include "i915_drm.h"
#include "drmtest.h"
#include "igt_kms.h"

#include "ioctl_wrappers.h"

/*
 * Mode setting with the kernel interfaces is a bit of a chore.
 * First you have to find the connector in question and make sure the
 * requested mode is available.
 * Then you need to find the encoder attached to that connector so you
 * can bind it with a free crtc.
 */
struct connector {
	uint32_t            id;
	int                 mode_valid;
	drmModeModeInfo     mode;
	drmModeEncoder      *encoder;
	drmModeConnector    *connector;
	int                 crtc;
	int                 pipe;
};

static void dump_mode(drmModeModeInfo *mode)
{
	printf("  %s %d %d %d %d %d %d %d %d %d 0x%x 0x%x %d\n",
		mode->name,
		mode->vrefresh,
		mode->hdisplay,
		mode->hsync_start,
		mode->hsync_end,
		mode->htotal,
		mode->vdisplay,
		mode->vsync_start,
		mode->vsync_end,
		mode->vtotal,
		mode->flags,
		mode->type,
		mode->clock);
}

static void dump_connectors(int gfx_fd, drmModeRes *resources)
{
	int i, j;

	printf("Connectors:\n");
	printf("id\tencoder\tstatus\t\ttype\tsize (mm)\tmodes\n");
	for (i = 0; i < resources->count_connectors; i++) {
		drmModeConnector *connector;

		connector = drmModeGetConnector(gfx_fd, resources->connectors[i]);
		if (!connector) {
			printf("could not get connector %i: %s\n",
					resources->connectors[i], strerror(errno));
			continue;
		}

		printf("%d\t%d\t%s\t%s\t%dx%d\t\t%d\n",
			connector->connector_id,
			connector->encoder_id,
			kmstest_connector_status_str(connector->connection),
			kmstest_connector_type_str(connector->connector_type),
			connector->mmWidth, connector->mmHeight,
			connector->count_modes);

		if (!connector->count_modes)
			continue;

		printf("  modes:\n");
		printf("  name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot flags type clock\n");
		for (j = 0; j < connector->count_modes; j++)
			dump_mode(&connector->modes[j]);

		drmModeFreeConnector(connector);
	}
	printf("\n");
}

static void dump_crtcs(int gfx_fd, drmModeRes *resources)
{
	int i;

	printf("CRTCs:\n");
	printf("id\tfb\tpos\tsize\n");
	for (i = 0; i < resources->count_crtcs; i++) {
		drmModeCrtc *crtc;

		crtc = drmModeGetCrtc(gfx_fd, resources->crtcs[i]);
		if (!crtc) {
			printf("could not get crtc %i: %s\n",
				resources->crtcs[i],
				strerror(errno));
			continue;
		}
		printf("%d\t%d\t(%d,%d)\t(%dx%d)\n",
			crtc->crtc_id,
			crtc->buffer_id,
			crtc->x, crtc->y,
			crtc->width, crtc->height);
		dump_mode(&crtc->mode);

		drmModeFreeCrtc(crtc);
	}
	printf("\n");
}

static void dump_planes(int gfx_fd, drmModeRes *resources)
{
	drmModePlaneRes             *plane_resources;
	drmModePlane                *ovr;
	int i;

	plane_resources = drmModeGetPlaneResources(gfx_fd);
	if (!plane_resources) {
		printf("drmModeGetPlaneResources failed: %s\n",
			strerror(errno));
		return;
	}

	printf("Planes:\n");
	printf("id\tcrtc\tfb\tCRTC x,y\tx,y\tgamma size\n");
	for (i = 0; i < plane_resources->count_planes; i++) {
		ovr = drmModeGetPlane(gfx_fd, plane_resources->planes[i]);
		if (!ovr) {
			printf("drmModeGetPlane failed: %s\n",
				strerror(errno));
			continue;
		}

		printf("%d\t%d\t%d\t%d,%d\t\t%d,%d\t%d\n",
			ovr->plane_id, ovr->crtc_id, ovr->fb_id,
			ovr->crtc_x, ovr->crtc_y, ovr->x, ovr->y,
			ovr->gamma_size);

		drmModeFreePlane(ovr);
	}
	printf("\n");

	return;
}

static void connector_find_preferred_mode(int gfx_fd,
					  drmModeRes *gfx_resources,
					  struct connector *c)
{
	drmModeConnector *connector;
	drmModeEncoder *encoder = NULL;
	int i, j;

	/* First, find the connector & mode */
	c->mode_valid = 0;
	connector = drmModeGetConnector(gfx_fd, c->id);
	if (!connector) {
		printf("could not get connector %d: %s\n",
			c->id,
			strerror(errno));
		drmModeFreeConnector(connector);
		return;
	}

	if (connector->connection != DRM_MODE_CONNECTED) {
		drmModeFreeConnector(connector);
		return;
	}

	if (!connector->count_modes) {
		printf("connector %d has no modes\n",
			c->id);
		drmModeFreeConnector(connector);
		return;
	}

	if (connector->connector_id != c->id) {
		printf("connector id doesn't match (%d != %d)\n",
			connector->connector_id,
			c->id);
		drmModeFreeConnector(connector);
		return;
	}

	for (j = 0; j < connector->count_modes; j++) {
		c->mode = connector->modes[j];
		if (c->mode.type & DRM_MODE_TYPE_PREFERRED) {
			c->mode_valid = 1;
			break;
		}
	}

	if (!c->mode_valid) {
		if (connector->count_modes > 0) {
			/* use the first mode as test mode */
			c->mode = connector->modes[0];
			c->mode_valid = 1;
		} else {
			printf("failed to find any modes on connector %d\n",
				c->id);
			return;
		}
	}

	/* Now get the encoder */
	for (i = 0; i < connector->count_encoders; i++) {
		encoder = drmModeGetEncoder(gfx_fd, connector->encoders[i]);

		if (!encoder) {
			printf("could not get encoder %i: %s\n",
				gfx_resources->encoders[i],
				strerror(errno));
			drmModeFreeEncoder(encoder);
			continue;
		}

		break;
	}

	c->encoder = encoder;

	if (i == gfx_resources->count_encoders) {
		printf("failed to find encoder\n");
		c->mode_valid = 0;
		return;
	}

	/* Find first CRTC not in use */
	for (i = 0; i < gfx_resources->count_crtcs; i++) {
		if (gfx_resources->crtcs[i] && (c->encoder->possible_crtcs & (1<<i)))
			break;
	}
	c->crtc = gfx_resources->crtcs[i];
	c->pipe = i;

	gfx_resources->crtcs[i] = 0;

	c->connector = connector;
}

static int connector_find_plane(int gfx_fd, struct connector *c,
				unsigned int **sprite_plane_id)
{
	drmModePlaneRes *plane_resources;
	drmModePlane *ovr;
	int i, sprite_plane_count = 0;

	plane_resources = drmModeGetPlaneResources(gfx_fd);
	if (!plane_resources) {
		printf("drmModeGetPlaneResources failed: %s\n",
			strerror(errno));
		return 0;
	}

	/* Allocating buffer to hold sprite plane ids of the
         * current connector.
         */
	*sprite_plane_id = (unsigned int *) malloc(plane_resources->count_planes *
						   sizeof(unsigned int));

	for (i = 0; i < plane_resources->count_planes; i++) {
		ovr = drmModeGetPlane(gfx_fd, plane_resources->planes[i]);
		if (!ovr) {
			printf("drmModeGetPlane failed: %s\n",
				strerror(errno));
			continue;
		}
		/* Add the available sprite id to the buffer sprite_plane_id.
                 */
		if (ovr->possible_crtcs & (1 << c->pipe)) {
			(*sprite_plane_id)[sprite_plane_count++] = ovr->plane_id;
		}
		drmModeFreePlane(ovr);
	}

	return sprite_plane_count;
}

static int prepare_primary_surface(int fd, int prim_width, int prim_height,
				   uint32_t *prim_handle, uint32_t *prim_stride,
				   uint32_t *prim_size, int tiled)
{
	uint32_t                        bytes_per_pixel = sizeof(uint32_t);
	uint32_t                        *prim_fb_ptr;

	if (bytes_per_pixel != sizeof(uint32_t)) {
		printf("Bad bytes_per_pixel for primary surface: %d\n",
			bytes_per_pixel);
		return -EINVAL;
	}

	if (tiled) {
		int                         v;

		/* Round the tiling up to the next power-of-two and the
		 * region up to the next pot fence size so that this works
		 * on all generations.
		 *
		 * This can still fail if the framebuffer is too large to
		 * be tiled. But then that failure is expected.
		 */

		v = prim_width * bytes_per_pixel;
		for (*prim_stride = 512; *prim_stride < v; *prim_stride *= 2)
			;

		v = *prim_stride * prim_height;
		for (*prim_size = 1024*1024; *prim_size < v; *prim_size *= 2)
			;
	} else {
		/* Scan-out has a 64 byte alignment restriction */
		*prim_stride = (prim_width * bytes_per_pixel + 63) & ~63;
		*prim_size = *prim_stride * prim_height;
	}

	*prim_handle = gem_create(fd, *prim_size);

	if (tiled)
		gem_set_tiling(fd, *prim_handle, I915_TILING_X, *prim_stride);

	prim_fb_ptr = gem_mmap(fd, *prim_handle, *prim_size, PROT_READ | PROT_WRITE);

	if (prim_fb_ptr != NULL) {
		// Write primary surface with gray background
		memset(prim_fb_ptr, 0x3f, *prim_size);
		munmap(prim_fb_ptr, *prim_size);
	}

	return 0;
}

static void fill_sprite(int sprite_width, int sprite_height, int sprite_stride,
			int sprite_index, void *sprite_fb_ptr)
{
	__u32                           *pLinePat0,
					*pLinePat1,
					*pLinePtr;
	int                             i,
					line;
	int                             stripe_width;

	stripe_width = ((sprite_width > 64) &&
			(sprite_height > 64)) ? (sprite_index + 1) * 8 :
		(sprite_index + 1) * 2;

	// Note:  sprite_stride is in bytes.  pLinePat0 and pLinePat1
	//        are both __u32 pointers
	pLinePat0 = sprite_fb_ptr;
	pLinePat1 = pLinePat0 + (stripe_width * (sprite_stride / sizeof(*pLinePat0)));

	for (i = 0; i < sprite_width; i++) {
		*(pLinePat0 + i) = ((i / stripe_width) & 0x1) ? 0 : ~0;
		*(pLinePat1 + i) = ~(*(pLinePat0 + i));
	}

	for (line = 1; line < sprite_height; line++) {
		if (line == stripe_width) {
			continue;
		}

		pLinePtr = ((line / stripe_width) & 0x1) ? pLinePat1 : pLinePat0;
		memcpy( pLinePat0 + ((sprite_stride / sizeof(*pLinePat0)) * line),
				pLinePtr,
				sprite_width * sizeof(*pLinePat0));
	}

	return;
}

static int prepare_sprite_surfaces(int fd, int sprite_width, int sprite_height,
				   uint32_t num_surfaces, uint32_t *sprite_handles,
				   uint32_t *sprite_stride, uint32_t *sprite_size,
				   int tiled)
{
	uint32_t                        bytes_per_pixel = sizeof(uint32_t);
	uint32_t                        *sprite_fb_ptr;
	int                             i;

	if (bytes_per_pixel != sizeof(uint32_t)) {
		printf("Bad bytes_per_pixel for sprite: %d\n", bytes_per_pixel);
		return -EINVAL;
	}

	if (tiled) {
		int                         v;

		/* Round the tiling up to the next power-of-two and the
		 * region up to the next pot fence size so that this works
		 * on all generations.
		 *
		 * This can still fail if the framebuffer is too large to
		 * be tiled. But then that failure is expected.
		 */

		v = sprite_width * bytes_per_pixel;
		for (*sprite_stride = 512; *sprite_stride < v; *sprite_stride *= 2)
			;

		v = *sprite_stride * sprite_height;
		for (*sprite_size = 1024*1024; *sprite_size < v; *sprite_size *= 2)
			;
	} else {
		/* Scan-out has a 64 byte alignment restriction */
		*sprite_stride = (sprite_width * bytes_per_pixel + 63) & ~63;
		*sprite_size = *sprite_stride * sprite_height;
	}

	for (i = 0; i < num_surfaces;  i++) {
		// Create the sprite surface
		sprite_handles[i] = gem_create(fd, *sprite_size);

		if (tiled)
			gem_set_tiling(fd, sprite_handles[i], I915_TILING_X, *sprite_stride);

		// Get pointer to the surface
		sprite_fb_ptr = gem_mmap(fd,
				sprite_handles[i], *sprite_size,
				PROT_READ | PROT_WRITE);

		if (sprite_fb_ptr != NULL) {
			// Fill with checkerboard pattern
			fill_sprite(sprite_width, sprite_height, *sprite_stride, i, sprite_fb_ptr);

			munmap(sprite_fb_ptr, *sprite_size);
		} else {
			i--;
			while (i >= 0) {
				gem_close(fd, sprite_handles[i]);
				i--;
			}
		}
	}

	return 0;
}

static void ricochet(int tiled, int sprite_w, int sprite_h,
		     int out_w, int out_h, int dump_info)
{
	int                                 ret;
	int                                 gfx_fd;
	int                                 keep_moving;
	const int                           num_surfaces = 3;
	uint32_t                            sprite_handles[num_surfaces];
	uint32_t                            sprite_fb_id[num_surfaces];
	int                                 *sprite_x = NULL;
	int                                 *sprite_y = NULL;
	uint32_t                            sprite_stride;
	uint32_t                            sprite_size;
	uint32_t                            handles[4],
					    pitches[4],
					    offsets[4]; /* we only use [0] */
	uint32_t                            prim_width,
					    prim_height,
					    prim_handle,
					    prim_stride,
					    prim_size,
					    prim_fb_id;
	struct drm_intel_sprite_colorkey    set;
	struct connector                    curr_connector;
	drmModeRes                          *gfx_resources;
	struct termios                      orig_term,
					    curr_term;
	int                                 c_index;
	int                                 sprite_index;
	unsigned int                        *sprite_plane_id = NULL;
	uint32_t                            plane_flags = 0;
	int                                 *delta_x = NULL,
					    *delta_y = NULL;
	struct timeval                      stTimeVal;
	long long                           currTime,
	     prevFlipTime,
	     prevMoveTime,
	     deltaFlipTime,
	     deltaMoveTime,
	     SleepTime;
	char                                key;
	int				    sprite_plane_count = 0;
	int 				    i;
	// Open up I915 graphics device
	gfx_fd = drmOpen("i915", NULL);
	if (gfx_fd < 0) {
		printf("Failed to load i915 driver: %s\n", strerror(errno));
		return;
	}

	// Obtain pointer to struct containing graphics resources
	gfx_resources = drmModeGetResources(gfx_fd);
	if (!gfx_resources) {
		printf("drmModeGetResources failed: %s\n", strerror(errno));
		return;
	}

	if (dump_info != 0) {
		dump_connectors(gfx_fd, gfx_resources);
		dump_crtcs(gfx_fd, gfx_resources);
		dump_planes(gfx_fd, gfx_resources);
	}

	// Save previous terminal settings
	if (tcgetattr( 0, &orig_term) != 0) {
		printf("tcgetattr failure: %s\n",
				strerror(errno));
		return;
	}

	// Set up input to return characters immediately
	curr_term = orig_term;
	curr_term.c_lflag &= ~(ICANON | ECHO | ECHONL);
	curr_term.c_cc[VMIN] = 0;       // No minimum number of characters
	curr_term.c_cc[VTIME] = 0 ;     // Return immediately, even if
	// nothing has been entered.
	if (tcsetattr( 0, TCSANOW, &curr_term) != 0) {
		printf("tcgetattr failure: %s\n", strerror(errno));
		return;
	}

	// Cycle through all connectors and display the flying sprite
	// where there are displays attached and the hardware will support it.
	for (c_index = 0; c_index < gfx_resources->count_connectors; c_index++)  {
		curr_connector.id = gfx_resources->connectors[c_index];

		// Find the native (preferred) display mode
		connector_find_preferred_mode(gfx_fd, gfx_resources, &curr_connector);
		if (curr_connector.mode_valid == 0) {
			printf("No valid preferred mode detected\n");
			goto out;
		}

		// Determine if sprite hardware is available on pipe
		// associated with this connector.
		sprite_plane_count = connector_find_plane(gfx_fd, &curr_connector,
							  &sprite_plane_id);
		if (!sprite_plane_count) {
			printf("Failed to find sprite plane on crtc\n");
			goto out;
		}

		// Width and height of preferred mode
		prim_width = curr_connector.mode.hdisplay;
		prim_height = curr_connector.mode.vdisplay;

		// Allocate and fill memory for primary surface
		ret = prepare_primary_surface(
				gfx_fd,
				prim_width,
				prim_height,
				&prim_handle,
				&prim_stride,
				&prim_size,
				tiled);
		if (ret != 0) {
			printf("Failed to add primary fb (%dx%d): %s\n",
				prim_width, prim_height, strerror(errno));
			goto out;
		}

		// Add the primary surface framebuffer
		ret = drmModeAddFB(gfx_fd, prim_width, prim_height, 24, 32,
				   prim_stride, prim_handle, &prim_fb_id);
		gem_close(gfx_fd, prim_handle);

		if (ret != 0) {
			printf("Failed to add primary fb (%dx%d): %s\n",
					prim_width, prim_height, strerror(errno));
			goto out;
		}

		// Allocate and fill sprite surfaces
		ret = prepare_sprite_surfaces(gfx_fd, sprite_w, sprite_h, num_surfaces,
					      &sprite_handles[0],
					      &sprite_stride, &sprite_size,
					      tiled);
		if (ret != 0) {
			printf("Preparation of sprite surfaces failed %dx%d\n",
				sprite_w, sprite_h);
			goto out;
		}

		// Add the sprite framebuffers
		for (sprite_index = 0; sprite_index < num_surfaces; sprite_index++) {
			handles[0] = sprite_handles[sprite_index];
			handles[1] = handles[0];
			handles[2] = handles[0];
			handles[3] = handles[0];
			pitches[0] = sprite_stride;
			pitches[1] = sprite_stride;
			pitches[2] = sprite_stride;
			pitches[3] = sprite_stride;
			memset(offsets, 0, sizeof(offsets));

			ret = drmModeAddFB2(gfx_fd, sprite_w, sprite_h,
					    DRM_FORMAT_XRGB8888,
					    handles, pitches, offsets,
					    &sprite_fb_id[sprite_index], plane_flags);
			gem_close(gfx_fd, sprite_handles[sprite_index]);

			if (ret) {
				printf("Failed to add sprite fb (%dx%d): %s\n",
				       sprite_w, sprite_h, strerror(errno));

				sprite_index--;
				while (sprite_index >= 0) {
					drmModeRmFB(gfx_fd, sprite_fb_id[sprite_index]);
					sprite_index--;
				}
				goto out;
			}
		}

		if (dump_info != 0) {
			printf("Displayed Mode Connector struct:\n"
				"    .id = %d\n"
				"    .mode_valid = %d\n"
				"    .crtc = %d\n"
				"    .pipe = %d\n"
				"    drmModeModeInfo ...\n"
				"        .name = %s\n"
				"        .type = %d\n"
				"        .flags = %08x\n"
				"    drmModeEncoder ...\n"
				"        .encoder_id = %d\n"
				"        .encoder_type = %d (%s)\n"
				"        .crtc_id = %d\n"
				"        .possible_crtcs = %d\n"
				"        .possible_clones = %d\n"
				"    drmModeConnector ...\n"
				"        .connector_id = %d\n"
				"        .encoder_id = %d\n"
				"        .connector_type = %d (%s)\n"
				"        .connector_type_id = %d\n\n",
				curr_connector.id,
				curr_connector.mode_valid,
				curr_connector.crtc,
				curr_connector.pipe,
				curr_connector.mode.name,
				curr_connector.mode.type,
				curr_connector.mode.flags,
				curr_connector.encoder->encoder_id,
				curr_connector.encoder->encoder_type,
				kmstest_encoder_type_str(curr_connector.encoder->encoder_type),
				curr_connector.encoder->crtc_id,
				curr_connector.encoder->possible_crtcs,
				curr_connector.encoder->possible_clones,
				curr_connector.connector->connector_id,
				curr_connector.connector->encoder_id,
				curr_connector.connector->connector_type,
				kmstest_connector_type_str(curr_connector.connector->connector_type),
				curr_connector.connector->connector_type_id);

			printf("Sprite surface dimensions = %dx%d\n"
				"Sprite output dimensions = %dx%d\n"
				"Press any key to continue >\n",
				sprite_w, sprite_h, out_w, out_h);

			// Wait for a key-press
			while( read(0, &key, 1) == 0);
			// Purge unread characters
			tcflush(0, TCIFLUSH);
		}

		// Set up the primary display mode
		ret = drmModeSetCrtc(gfx_fd, curr_connector.crtc, prim_fb_id,
				     0, 0, &curr_connector.id, 1, &curr_connector.mode);
		if (ret != 0) {
			printf("Failed to set mode (%dx%d@%dHz): %s\n",
				prim_width, prim_height, curr_connector.mode.vrefresh,
				strerror(errno));
			continue;
		}

		// Set the sprite colorkey state
		for(i = 0; i < sprite_plane_count; i++) {
			set.plane_id = sprite_plane_id[i];
			set.min_value = 0;
			set.max_value = 0;
			set.flags = I915_SET_COLORKEY_NONE;
			ret = drmCommandWrite(gfx_fd, DRM_I915_SET_SPRITE_COLORKEY, &set,
					      sizeof(set));
			assert(ret == 0);
		}

		// Set up sprite output dimensions, initial position, etc.
		if (out_w > prim_width / 2)
			out_w = prim_width / 2;
		if (out_h > prim_height / 2)
			out_h = prim_height / 2;

		delta_x = (int *) malloc(sprite_plane_count * sizeof(int));
		delta_y = (int *) malloc(sprite_plane_count * sizeof(int));
		sprite_x = (int *) malloc(sprite_plane_count * sizeof(int));
		sprite_y = (int *) malloc(sprite_plane_count * sizeof(int));

		/* Initializing the coordinates (x,y) of the available sprites on the
		 * connector, equally spaced along the diagonal of the rectangle
		 * {(0,0),(prim_width/2, prim_height/2)}.
		 */
		for(i = 0; i < sprite_plane_count; i++) {
			delta_x[i] = 3;
			delta_y[i] = 4;
			sprite_x[i] = i * (prim_width / (2 * sprite_plane_count));
			sprite_y[i] = i * (prim_height / (2 * sprite_plane_count));
		}

		currTime = 0;
		prevFlipTime = 0;       // Will force immediate sprite flip
		prevMoveTime = 0;       // Will force immediate sprite move
		deltaFlipTime = 500000; // Flip sprite surface every 1/2 second
		deltaMoveTime = 100000; // Move sprite every 100 ms
		sprite_index = num_surfaces - 1;
		keep_moving = 1;

		// Bounce sprite off the walls
		while (keep_moving) {
			// Obtain system time in usec.
			if (gettimeofday( &stTimeVal, NULL ) != 0)
				printf("gettimeofday error: %s\n", strerror(errno));
			else
				currTime = ((long long)stTimeVal.tv_sec * 1000000) + stTimeVal.tv_usec;

			// Check if it's time to flip the sprite surface
			if (currTime - prevFlipTime > deltaFlipTime) {
				sprite_index = (sprite_index + 1) % num_surfaces;

				prevFlipTime = currTime;
			}

			// Move the sprite on the screen and flip
			// the surface if the index has changed
			// NB: sprite_w and sprite_h must be 16.16 fixed point, herego << 16
			for(i = 0; i < sprite_plane_count; i++) {
				if (drmModeSetPlane(gfx_fd, sprite_plane_id[i],
						    curr_connector.crtc,
						    sprite_fb_id[sprite_index],
						    plane_flags,
						    sprite_x[i], sprite_y[i],
						    out_w, out_h,
						    0, 0,
						    sprite_w << 16, sprite_h << 16))
					printf("Failed to enable sprite plane: %s\n",
						strerror(errno));
			}

			// Check if it's time to move the sprite surface
			if (currTime - prevMoveTime > deltaMoveTime)  {

				// Compute the next position for sprite
				for(i = 0; i < sprite_plane_count; i++) {
					sprite_x[i] += delta_x[i];
					sprite_y[i] += delta_y[i];
					if (sprite_x[i] < 0) {
						sprite_x[i] = 0;
						delta_x[i] = -delta_x[i];
					}
					else if (sprite_x[i] > prim_width - out_w) {
						sprite_x[i] = prim_width - out_w;
						delta_x[i] = -delta_x[i];
					}

					if (sprite_y[i] < 0) {
						sprite_y[i] = 0;
						delta_y[i] = -delta_y[i];
					}
					else if (sprite_y[i] > prim_height - out_h) {
						sprite_y[i] = prim_height - out_h;
						delta_y[i] = -delta_y[i];
					}
				}
				prevMoveTime = currTime;
			}

			// Fetch a key from input (non-blocking)
			if (read(0, &key, 1) == 1) {
				switch (key) {
				case 'q':       // Kill the program
				case 'Q':
					goto out;
					break;
				case 's':       // Slow down sprite movement;
					deltaMoveTime = (deltaMoveTime * 100) / 90;
					if (deltaMoveTime > 800000) {
						deltaMoveTime = 800000;
					}
					break;
				case 'S':       // Speed up sprite movement;
					deltaMoveTime = (deltaMoveTime * 100) / 110;
					if (deltaMoveTime < 2000) {
						deltaMoveTime = 2000;
					}
					break;
				case 'f':       // Slow down sprite flipping;
					deltaFlipTime = (deltaFlipTime * 100) / 90;
					if (deltaFlipTime > 1000000)
						deltaFlipTime = 1000000;
					break;
				case 'F':       // Speed up sprite flipping;
					deltaFlipTime = (deltaFlipTime * 100) / 110;
					if (deltaFlipTime < 20000)
						deltaFlipTime = 20000;
					break;
				case 'n':       // Next connector
				case 'N':
					keep_moving = 0;
					break;
				default:
					break;
				}

				// Purge unread characters
				tcflush(0, TCIFLUSH);
			}

			// Wait for min of flip or move deltas
			SleepTime = (deltaFlipTime < deltaMoveTime) ?
				deltaFlipTime : deltaMoveTime;
			usleep(SleepTime);
		}

		free(sprite_plane_id);
		free(sprite_x);
		free(sprite_y);
		free(delta_x);
		free(delta_y);
		sprite_plane_id = NULL;
		sprite_plane_count = 0;
		sprite_x = sprite_y = delta_x = delta_y = NULL;
	}

out:
	// Purge unread characters
	tcflush(0, TCIFLUSH);
	// Restore previous terminal settings
	if (tcsetattr( 0, TCSANOW, &orig_term) != 0) {
		printf("tcgetattr failure: %s\n", strerror(errno));
		return;
	}

	drmModeFreeResources(gfx_resources);
}

static void usage(char *name)
{
	printf("usage: %s -s <plane width>x<plane height> [-dhto]\n"
		"\t-d\t[optional] dump mode information\n"
		"\t-h\t[optional] output help message\n"
		"\t-t\t[optional] enable tiling\n"
		"\t-o\t[optional] <output rect width>x<output rect height>\n\n"
		"Keyboard control for sprite movement and flip rate ...\n"
		"\t'q' or 'Q' - Quit the program\n"
		"\t'n' or 'N' - Switch to next display\n"
		"\t's'        - Slow sprite movement\n"
		"\t'S'        - Speed up sprite movement\n"
		"\t'f'        - Slow sprite surface flipping\n"
		"\t'F'        - Speed up sprite surface flipping\n",
		name);
}

int main(int argc, char **argv)
{
	int                 c;
	int                 test_overlay = 0,
			    enable_tiling = 0,
			    dump_info = 0;
	int                 plane_width = 0,
			    plane_height = 0,
			    out_width = 0,
			    out_height = 0;
	static char         optstr[] = "ds:o:th";

	opterr = 0;
	while ((c = getopt(argc, argv, optstr)) != -1) {
		switch (c) {
		case 'd':               // Dump information
			dump_info = 1;
			break;
		case 't':               // Tiling enable
			enable_tiling = 1;
			break;
		case 's':               // Surface dimensions
			if (sscanf(optarg, "%dx%d", &plane_width, &plane_height) != 2)
				usage(argv[0]);
			test_overlay = 1;
			break;
		case 'o':               // Output dimensions
			if (sscanf(optarg, "%dx%d", &out_width, &out_height) != 2)
				usage(argv[0]);
			break;
		default:
			printf("unknown option %c\n", c);
			/* fall through */
		case 'h':               // Help!
			usage(argv[0]);
			goto out;
		}
	}

	if (test_overlay) {
		if (out_width < (plane_width / 2))
			out_width = plane_width;

		if (out_height < (plane_height / 2))
			out_height = plane_height;

		ricochet(enable_tiling, plane_width, plane_height, out_width, out_height, dump_info);
	} else {
		printf("Sprite dimensions are required:\n");
		usage(argv[0]);
	}

out:
	exit(0);
}
