/**********************************************************
 * Copyright 2009-2011 VMware, Inc. All rights reserved.
 *
 * 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 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.
 *
 *********************************************************
 * Authors:
 * Thomas Hellstrom <thellstrom-at-vmware-dot-com>
 */

#include <unistd.h>
#include <fcntl.h>
#include "xa_tracker.h"
#include "xa_priv.h"
#include "pipe/p_state.h"
#include "pipe/p_format.h"
#include "pipe-loader/pipe_loader.h"
#include "state_tracker/drm_driver.h"
#include "util/u_inlines.h"

/*
 * format_map [xa_surface_type][first..last in list].
 * Needs to be updated when enum xa_formats is updated.
 */

static const enum xa_formats preferred_a[] = { xa_format_a8 };

static const enum xa_formats preferred_argb[] =
    { xa_format_a8r8g8b8, xa_format_x8r8g8b8, xa_format_r5g6b5,
    xa_format_x1r5g5b5
};
static const enum xa_formats preferred_z[] =
    { xa_format_z32, xa_format_z24, xa_format_z16 };
static const enum xa_formats preferred_sz[] =
    { xa_format_x8z24, xa_format_s8z24 };
static const enum xa_formats preferred_zs[] =
    { xa_format_z24x8, xa_format_z24s8 };
static const enum xa_formats preferred_yuv[] = { xa_format_yuv8 };

static const enum xa_formats *preferred[] =
    { NULL, preferred_a, preferred_argb, NULL, NULL,
    preferred_z, preferred_zs, preferred_sz, preferred_yuv
};

static const unsigned int num_preferred[] = { 0,
    sizeof(preferred_a) / sizeof(enum xa_formats),
    sizeof(preferred_argb) / sizeof(enum xa_formats),
    0,
    0,
    sizeof(preferred_z) / sizeof(enum xa_formats),
    sizeof(preferred_zs) / sizeof(enum xa_formats),
    sizeof(preferred_sz) / sizeof(enum xa_formats),
    sizeof(preferred_yuv) / sizeof(enum xa_formats)
};

static const unsigned int stype_bind[XA_LAST_SURFACE_TYPE] = { 0,
    PIPE_BIND_SAMPLER_VIEW,
    PIPE_BIND_SAMPLER_VIEW,
    PIPE_BIND_SAMPLER_VIEW,
    PIPE_BIND_SAMPLER_VIEW,
    PIPE_BIND_DEPTH_STENCIL,
    PIPE_BIND_DEPTH_STENCIL,
    PIPE_BIND_DEPTH_STENCIL,
    PIPE_BIND_SAMPLER_VIEW
};

static struct xa_format_descriptor
xa_get_pipe_format(struct xa_tracker *xa, enum xa_formats xa_format)
{
    struct xa_format_descriptor fdesc;

    fdesc.xa_format = xa_format;

    switch (xa_format) {
    case xa_format_a8r8g8b8:
	fdesc.format = PIPE_FORMAT_B8G8R8A8_UNORM;
	break;
    case xa_format_x8r8g8b8:
	fdesc.format = PIPE_FORMAT_B8G8R8X8_UNORM;
	break;
    case xa_format_r5g6b5:
	fdesc.format = PIPE_FORMAT_B5G6R5_UNORM;
	break;
    case xa_format_x1r5g5b5:
	fdesc.format = PIPE_FORMAT_B5G5R5A1_UNORM;
	break;
    case xa_format_a8:
        if (xa->screen->is_format_supported(xa->screen, PIPE_FORMAT_R8_UNORM,
                                            PIPE_TEXTURE_2D, 0,
                                            stype_bind[xa_type_a] |
                                            PIPE_BIND_RENDER_TARGET))
            fdesc.format = PIPE_FORMAT_R8_UNORM;
        else
            fdesc.format = PIPE_FORMAT_L8_UNORM;
	break;
    case xa_format_z24:
	fdesc.format = PIPE_FORMAT_Z24X8_UNORM;
	break;
    case xa_format_z16:
	fdesc.format = PIPE_FORMAT_Z16_UNORM;
	break;
    case xa_format_z32:
	fdesc.format = PIPE_FORMAT_Z32_UNORM;
	break;
    case xa_format_x8z24:
	fdesc.format = PIPE_FORMAT_Z24X8_UNORM;
	break;
    case xa_format_z24x8:
	fdesc.format = PIPE_FORMAT_X8Z24_UNORM;
	break;
    case xa_format_s8z24:
	fdesc.format = PIPE_FORMAT_Z24_UNORM_S8_UINT;
	break;
    case xa_format_z24s8:
	fdesc.format = PIPE_FORMAT_S8_UINT_Z24_UNORM;
	break;
    case xa_format_yuv8:
        if (xa->screen->is_format_supported(xa->screen, PIPE_FORMAT_R8_UNORM,
                                            PIPE_TEXTURE_2D, 0,
                                            stype_bind[xa_type_yuv_component]))
            fdesc.format = PIPE_FORMAT_R8_UNORM;
        else
            fdesc.format = PIPE_FORMAT_L8_UNORM;
	break;
    default:
	fdesc.xa_format = xa_format_unknown;
	break;
    }
    return fdesc;
}

XA_EXPORT struct xa_tracker *
xa_tracker_create(int drm_fd)
{
    struct xa_tracker *xa = calloc(1, sizeof(struct xa_tracker));
    enum xa_surface_type stype;
    unsigned int num_formats;
    int fd;

    if (!xa)
	return NULL;

    if (drm_fd < 0 || (fd = fcntl(drm_fd, F_DUPFD_CLOEXEC, 3)) < 0)
	goto out_no_fd;

    if (pipe_loader_drm_probe_fd(&xa->dev, fd))
	xa->screen = pipe_loader_create_screen(xa->dev);

    if (!xa->screen)
	goto out_no_screen;

    xa->default_ctx = xa_context_create(xa);
    if (!xa->default_ctx)
	goto out_no_pipe;

    num_formats = 0;
    for (stype = 0; stype < XA_LAST_SURFACE_TYPE; ++stype)
	num_formats += num_preferred[stype];

    num_formats += 1;
    xa->supported_formats = calloc(num_formats, sizeof(*xa->supported_formats));
    if (!xa->supported_formats)
	goto out_sf_alloc_fail;

    xa->supported_formats[0] = xa_format_unknown;
    num_formats = 1;
    memset(xa->format_map, 0, sizeof(xa->format_map));

    for (stype = 0; stype < XA_LAST_SURFACE_TYPE; ++stype) {
	unsigned int bind = stype_bind[stype];
	enum xa_formats xa_format;
	int i;

	for (i = 0; i < num_preferred[stype]; ++i) {
	    xa_format = preferred[stype][i];

	    struct xa_format_descriptor fdesc =
                xa_get_pipe_format(xa, xa_format);

	    if (xa->screen->is_format_supported(xa->screen, fdesc.format,
						PIPE_TEXTURE_2D, 0, bind)) {
		if (xa->format_map[stype][0] == 0)
		    xa->format_map[stype][0] = num_formats;
		xa->format_map[stype][1] = num_formats;
		xa->supported_formats[num_formats++] = xa_format;
	    }
	}
    }
    return xa;

 out_sf_alloc_fail:
    xa_context_destroy(xa->default_ctx);
 out_no_pipe:
    xa->screen->destroy(xa->screen);
 out_no_screen:
    if (xa->dev)
	pipe_loader_release(&xa->dev, 1);
    else
	close(fd);
 out_no_fd:
    free(xa);
    return NULL;
}

XA_EXPORT void
xa_tracker_destroy(struct xa_tracker *xa)
{
    free(xa->supported_formats);
    xa_context_destroy(xa->default_ctx);
    xa->screen->destroy(xa->screen);
    pipe_loader_release(&xa->dev, 1);
    free(xa);
}

static int
xa_flags_compat(unsigned int old_flags, unsigned int new_flags)
{
    unsigned int flag_diff = (old_flags ^ new_flags);

    if (flag_diff == 0)
	return 1;

    if (flag_diff & XA_FLAG_SHARED)
	return 0;
    /*
     * Don't recreate if we're dropping the render target flag.
     */
    if (flag_diff & XA_FLAG_RENDER_TARGET)
	return ((new_flags & XA_FLAG_RENDER_TARGET) == 0);

    /*
     * Don't recreate if we're dropping the scanout flag.
     */
    if (flag_diff & XA_FLAG_SCANOUT)
	return ((new_flags & XA_FLAG_SCANOUT) == 0);

    /*
     * Always recreate for unknown / unimplemented flags.
     */
    return 0;
}

static struct xa_format_descriptor
xa_get_format_stype_depth(struct xa_tracker *xa,
			  enum xa_surface_type stype, unsigned int depth)
{
    unsigned int i;
    struct xa_format_descriptor fdesc;
    int found = 0;

    for (i = xa->format_map[stype][0]; i <= xa->format_map[stype][1]; ++i) {
	fdesc = xa_get_pipe_format(xa, xa->supported_formats[i]);
	if (fdesc.xa_format != xa_format_unknown &&
	    xa_format_depth(fdesc.xa_format) == depth) {
	    found = 1;
	    break;
	}
    }

    if (!found)
	fdesc.xa_format = xa_format_unknown;

    return fdesc;
}

XA_EXPORT int
xa_format_check_supported(struct xa_tracker *xa,
			  enum xa_formats xa_format, unsigned int flags)
{
    struct xa_format_descriptor fdesc = xa_get_pipe_format(xa, xa_format);
    unsigned int bind;

    if (fdesc.xa_format == xa_format_unknown)
	return -XA_ERR_INVAL;

    bind = stype_bind[xa_format_type(fdesc.xa_format)];
    if (flags & XA_FLAG_SHARED)
	bind |= PIPE_BIND_SHARED;
    if (flags & XA_FLAG_RENDER_TARGET)
	bind |= PIPE_BIND_RENDER_TARGET;
    if (flags & XA_FLAG_SCANOUT)
	bind |= PIPE_BIND_SCANOUT;

    if (!xa->screen->is_format_supported(xa->screen, fdesc.format,
					 PIPE_TEXTURE_2D, 0, bind))
	return -XA_ERR_INVAL;

    return XA_ERR_NONE;
}

static unsigned
handle_type(enum xa_handle_type type)
{
    switch (type) {
    case xa_handle_type_kms:
	return DRM_API_HANDLE_TYPE_KMS;
    case xa_handle_type_fd:
        return DRM_API_HANDLE_TYPE_FD;
    case xa_handle_type_shared:
    default:
	return DRM_API_HANDLE_TYPE_SHARED;
    }
}

static struct xa_surface *
surface_create(struct xa_tracker *xa,
		  int width,
		  int height,
		  int depth,
		  enum xa_surface_type stype,
		  enum xa_formats xa_format, unsigned int flags,
		  struct winsys_handle *whandle)
{
    struct pipe_resource *template;
    struct xa_surface *srf;
    struct xa_format_descriptor fdesc;

    if (xa_format == xa_format_unknown)
	fdesc = xa_get_format_stype_depth(xa, stype, depth);
    else
	fdesc = xa_get_pipe_format(xa, xa_format);

    if (fdesc.xa_format == xa_format_unknown)
	return NULL;

    srf = calloc(1, sizeof(*srf));
    if (!srf)
	return NULL;

    template = &srf->template;
    template->format = fdesc.format;
    template->target = PIPE_TEXTURE_2D;
    template->width0 = width;
    template->height0 = height;
    template->depth0 = 1;
    template->array_size = 1;
    template->last_level = 0;
    template->bind = stype_bind[xa_format_type(fdesc.xa_format)];

    if (flags & XA_FLAG_SHARED)
	template->bind |= PIPE_BIND_SHARED;
    if (flags & XA_FLAG_RENDER_TARGET)
	template->bind |= PIPE_BIND_RENDER_TARGET;
    if (flags & XA_FLAG_SCANOUT)
	template->bind |= PIPE_BIND_SCANOUT;

    if (whandle)
	srf->tex = xa->screen->resource_from_handle(xa->screen, template, whandle,
                                                    PIPE_HANDLE_USAGE_READ_WRITE);
    else
	srf->tex = xa->screen->resource_create(xa->screen, template);
    if (!srf->tex)
	goto out_no_tex;

    srf->refcount = 1;
    srf->xa = xa;
    srf->flags = flags;
    srf->fdesc = fdesc;

    return srf;
 out_no_tex:
    free(srf);
    return NULL;
}


XA_EXPORT struct xa_surface *
xa_surface_create(struct xa_tracker *xa,
		  int width,
		  int height,
		  int depth,
		  enum xa_surface_type stype,
		  enum xa_formats xa_format, unsigned int flags)
{
    return surface_create(xa, width, height, depth, stype, xa_format, flags, NULL);
}


XA_EXPORT struct xa_surface *
xa_surface_from_handle(struct xa_tracker *xa,
		  int width,
		  int height,
		  int depth,
		  enum xa_surface_type stype,
		  enum xa_formats xa_format, unsigned int flags,
		  uint32_t handle, uint32_t stride)
{
    return xa_surface_from_handle2(xa, width, height, depth, stype, xa_format,
                                   DRM_API_HANDLE_TYPE_SHARED, flags, handle,
                                   stride);
}

XA_EXPORT struct xa_surface *
xa_surface_from_handle2(struct xa_tracker *xa,
                        int width,
                        int height,
                        int depth,
                        enum xa_surface_type stype,
                        enum xa_formats xa_format, unsigned int flags,
                        enum xa_handle_type type,
                        uint32_t handle, uint32_t stride)
{
    struct winsys_handle whandle;
    memset(&whandle, 0, sizeof(whandle));
    whandle.type = handle_type(type);
    whandle.handle = handle;
    whandle.stride = stride;
    return surface_create(xa, width, height, depth, stype, xa_format, flags, &whandle);
}

XA_EXPORT int
xa_surface_redefine(struct xa_surface *srf,
		    int width,
		    int height,
		    int depth,
		    enum xa_surface_type stype,
		    enum xa_formats xa_format,
		    unsigned int new_flags,
		    int copy_contents)
{
    struct pipe_resource *template = &srf->template;
    struct pipe_resource *texture;
    struct pipe_box src_box;
    struct xa_tracker *xa = srf->xa;
    int save_width;
    int save_height;
    unsigned int save_format;
    struct xa_format_descriptor fdesc;


    if (xa_format == xa_format_unknown)
	fdesc = xa_get_format_stype_depth(xa, stype, depth);
    else
	fdesc = xa_get_pipe_format(xa, xa_format);

    if (width == template->width0 && height == template->height0 &&
	template->format == fdesc.format &&
	xa_flags_compat(srf->flags, new_flags))
	return XA_ERR_NONE;

    template->bind = stype_bind[xa_format_type(fdesc.xa_format)];
    if (new_flags & XA_FLAG_SHARED)
	template->bind |= PIPE_BIND_SHARED;
    if (new_flags & XA_FLAG_RENDER_TARGET)
	template->bind |= PIPE_BIND_RENDER_TARGET;
    if (new_flags & XA_FLAG_SCANOUT)
	template->bind |= PIPE_BIND_SCANOUT;

    if (copy_contents) {
	if (!xa_format_type_is_color(fdesc.xa_format) ||
	    xa_format_type(fdesc.xa_format) == xa_type_a)
	    return -XA_ERR_INVAL;

	if (!xa->screen->is_format_supported(xa->screen, fdesc.format,
					     PIPE_TEXTURE_2D, 0,
					     template->bind |
					     PIPE_BIND_RENDER_TARGET))
	    return -XA_ERR_INVAL;
    }

    save_width = template->width0;
    save_height = template->height0;
    save_format = template->format;

    template->width0 = width;
    template->height0 = height;
    template->format = fdesc.format;

    texture = xa->screen->resource_create(xa->screen, template);
    if (!texture) {
	template->width0 = save_width;
	template->height0 = save_height;
	template->format = save_format;
	return -XA_ERR_NORES;
    }

    if (copy_contents) {
	struct pipe_context *pipe = xa->default_ctx->pipe;

	u_box_origin_2d(xa_min(save_width, template->width0),
			xa_min(save_height, template->height0), &src_box);
	pipe->resource_copy_region(pipe, texture,
				   0, 0, 0, 0, srf->tex, 0, &src_box);
	xa_context_flush(xa->default_ctx);
    }

    pipe_resource_reference(&srf->tex, texture);
    pipe_resource_reference(&texture, NULL);
    srf->fdesc = fdesc;
    srf->flags = new_flags;

    return XA_ERR_NONE;
}

XA_EXPORT struct xa_surface*
xa_surface_ref(struct xa_surface *srf)
{
    if (srf == NULL) {
	return NULL;
    }
    srf->refcount++;
    return srf;
}

XA_EXPORT void
xa_surface_unref(struct xa_surface *srf)
{
    if (srf == NULL || --srf->refcount) {
	return;
    }
    pipe_resource_reference(&srf->tex, NULL);
    free(srf);
}

XA_EXPORT void
xa_tracker_version(int *major, int *minor, int *patch)
{
    *major = XA_TRACKER_VERSION_MAJOR;
    *minor = XA_TRACKER_VERSION_MINOR;
    *patch = XA_TRACKER_VERSION_PATCH;
}

XA_EXPORT int
xa_surface_handle(struct xa_surface *srf,
		  enum xa_handle_type type,
		  uint32_t * handle, unsigned int *stride)
{
    struct winsys_handle whandle;

    struct pipe_screen *screen = srf->xa->screen;
    boolean res;

    memset(&whandle, 0, sizeof(whandle));
    whandle.type = handle_type(type);
    res = screen->resource_get_handle(screen, srf->xa->default_ctx->pipe,
                                      srf->tex, &whandle,
                                      PIPE_HANDLE_USAGE_READ_WRITE);
    if (!res)
	return -XA_ERR_INVAL;

    *handle = whandle.handle;
    *stride = whandle.stride;

    return XA_ERR_NONE;
}

XA_EXPORT enum xa_formats
xa_surface_format(const struct xa_surface *srf)
{
    return srf->fdesc.xa_format;
}