/*

 * Copyright © 2014 NVIDIA 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.

 */

#include <errno.h>

#include <string.h>

#include <sys/mman.h>

#include <drm_fourcc.h>

#include "xf86drm.h"

#include "libkms-test.h"

struct kms_framebuffer *kms_framebuffer_create(struct kms_device *device,

					       unsigned int width,

					       unsigned int height,

					       uint32_t format)

{

	uint32_t handles[4], pitches[4], offsets[4];

	struct drm_mode_create_dumb args;

	struct kms_framebuffer *fb;

	int err;

	fb = calloc(1, sizeof(*fb));

	if (!fb)

		return NULL;

	fb->device = device;

	fb->width = width;

	fb->height = height;

	fb->format = format;

	memset(&args, 0, sizeof(args));

	args.width = width;

	args.height = height;

	switch (format) {

	case DRM_FORMAT_XRGB8888:

	case DRM_FORMAT_XBGR8888:

	case DRM_FORMAT_RGBA8888:

		args.bpp = 32;

		break;

	default:

		free(fb);

		return NULL;

	}

	err = drmIoctl(device->fd, DRM_IOCTL_MODE_CREATE_DUMB, &args);

	if (err < 0) {

		free(fb);

		return NULL;

	}

	fb->handle = args.handle;

	fb->pitch = args.pitch;

	fb->size = args.size;

	handles[0] = fb->handle;

	pitches[0] = fb->pitch;

	offsets[0] = 0;

	err = drmModeAddFB2(device->fd, width, height, format, handles,

			    pitches, offsets, &fb->id, 0);

	if (err < 0) {

		kms_framebuffer_free(fb);

		return NULL;

	}

	return fb;

}

void kms_framebuffer_free(struct kms_framebuffer *fb)

{

	struct kms_device *device = fb->device;

	struct drm_mode_destroy_dumb args;

	int err;

	if (fb->id) {

		err = drmModeRmFB(device->fd, fb->id);

		if (err < 0) {

			/* not much we can do now */

		}

	}

	memset(&args, 0, sizeof(args));

	args.handle = fb->handle;

	err = drmIoctl(device->fd, DRM_IOCTL_MODE_DESTROY_DUMB, &args);

	if (err < 0) {

		/* not much we can do now */

	}

	free(fb);

}

int kms_framebuffer_map(struct kms_framebuffer *fb, void **ptrp)

{

	struct kms_device *device = fb->device;

	struct drm_mode_map_dumb args;

	void *ptr;

	int err;

	if (fb->ptr) {

		*ptrp = fb->ptr;

		return 0;

	}

	memset(&args, 0, sizeof(args));

	args.handle = fb->handle;

	err = drmIoctl(device->fd, DRM_IOCTL_MODE_MAP_DUMB, &args);

	if (err < 0)

		return -errno;

	ptr = mmap(0, fb->size, PROT_READ | PROT_WRITE, MAP_SHARED,

		   device->fd, args.offset);

	if (ptr == MAP_FAILED)

		return -errno;

	*ptrp = fb->ptr = ptr;

	return 0;

}

void kms_framebuffer_unmap(struct kms_framebuffer *fb)

{

	if (fb->ptr) {

		munmap(fb->ptr, fb->size);

		fb->ptr = NULL;

	}

}