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/*

 * Copyright (C) 2009 Maciej Cencora 

 *

 * 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 (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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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 "radeon_common.h"

#include "radeon_texture.h"

#include "main/enums.h"

#include "main/image.h"

#include "main/teximage.h"

#include "main/texstate.h"

#include "drivers/common/meta.h"

#include "radeon_mipmap_tree.h"

static GLboolean

do_copy_texsubimage(struct gl_context *ctx,

                    struct radeon_tex_obj *tobj,

                    radeon_texture_image *timg,

                    GLint dstx, GLint dsty,

                    struct radeon_renderbuffer *rrb,

                    GLint x, GLint y,

                    GLsizei width, GLsizei height)

{

    radeonContextPtr radeon = RADEON_CONTEXT(ctx);

    const GLuint face = timg->base.Base.Face;

    const GLuint level = timg->base.Base.Level;

    unsigned src_bpp;

    unsigned dst_bpp;

    mesa_format src_mesaformat;

    mesa_format dst_mesaformat;

    unsigned flip_y;

    if (!radeon->vtbl.blit) {

        return GL_FALSE;

    }

    // This is software renderbuffer, fallback to swrast

    if (!rrb) {

        return GL_FALSE;

    }

    if (_mesa_get_format_bits(timg->base.Base.TexFormat, GL_DEPTH_BITS) > 0) {

        /* copying depth values */

        flip_y = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Type == GL_NONE;

    } else {

        /* copying color */

        flip_y = ctx->ReadBuffer->Attachment[BUFFER_COLOR0].Type == GL_NONE;

    }

    if (!timg->mt) {

        radeon_validate_texture_miptree(ctx, &tobj->base.Sampler, &tobj->base);

    }

    assert(rrb->bo);

    assert(timg->mt);

    assert(timg->mt->bo);

    assert(timg->base.Base.Width >= dstx + width);

    assert(timg->base.Base.Height >= dsty + height);

    intptr_t src_offset = rrb->draw_offset;

    intptr_t dst_offset = radeon_miptree_image_offset(timg->mt, face, level);

    if (0) {

        fprintf(stderr, "%s: copying to face %d, level %d\n",

                __func__, face, level);

        fprintf(stderr, "to: x %d, y %d, offset %d\n", dstx, dsty, (uint32_t) dst_offset);

        fprintf(stderr, "from (%dx%d) width %d, height %d, offset %d, pitch %d\n",

                x, y, rrb->base.Base.Width, rrb->base.Base.Height, (uint32_t) src_offset, rrb->pitch/rrb->cpp);

        fprintf(stderr, "src size %d, dst size %d\n", rrb->bo->size, timg->mt->bo->size);

    }

    src_mesaformat = rrb->base.Base.Format;

    dst_mesaformat = timg->base.Base.TexFormat;

    src_bpp = _mesa_get_format_bytes(src_mesaformat);

    dst_bpp = _mesa_get_format_bytes(dst_mesaformat);

    if (!radeon->vtbl.check_blit(dst_mesaformat, rrb->pitch / rrb->cpp)) {

	    /* depth formats tend to be special */

	    if (_mesa_get_format_bits(dst_mesaformat, GL_DEPTH_BITS) > 0)

		    return GL_FALSE;

	    if (src_bpp != dst_bpp)

		    return GL_FALSE;

	    switch (dst_bpp) {

	    case 2:

		    src_mesaformat = MESA_FORMAT_B5G6R5_UNORM;

		    dst_mesaformat = MESA_FORMAT_B5G6R5_UNORM;

		    break;

	    case 4:

		    src_mesaformat = MESA_FORMAT_B8G8R8A8_UNORM;

		    dst_mesaformat = MESA_FORMAT_B8G8R8A8_UNORM;

		    break;

	    case 1:

		    src_mesaformat = MESA_FORMAT_A_UNORM8;

		    dst_mesaformat = MESA_FORMAT_A_UNORM8;

		    break;

	    default:

		    return GL_FALSE;

	    }

    }

    /* blit from src buffer to texture */

    return radeon->vtbl.blit(ctx, rrb->bo, src_offset, src_mesaformat, rrb->pitch/rrb->cpp,

                             rrb->base.Base.Width, rrb->base.Base.Height, x, y,

                             timg->mt->bo, dst_offset, dst_mesaformat,

                             timg->mt->levels[level].rowstride / dst_bpp,

                             timg->base.Base.Width, timg->base.Base.Height,

                             dstx, dsty, width, height, flip_y);

}

void

radeonCopyTexSubImage(struct gl_context *ctx, GLuint dims,

                      struct gl_texture_image *texImage,

                      GLint xoffset, GLint yoffset, GLint slice,

                      struct gl_renderbuffer *rb,

                      GLint x, GLint y,

                      GLsizei width, GLsizei height)

{

    radeonContextPtr radeon = RADEON_CONTEXT(ctx);

    radeon_prepare_render(radeon);

    if (slice != 0 || !do_copy_texsubimage(ctx,

                             radeon_tex_obj(texImage->TexObject),

                             (radeon_texture_image *)texImage,

                             xoffset, yoffset,

                             radeon_renderbuffer(rb),                                                        x, y, width, height)) {

        radeon_print(RADEON_FALLBACKS, RADEON_NORMAL,

                     "Falling back to sw for glCopyTexSubImage2D\n");

        _mesa_meta_CopyTexSubImage(ctx, dims, texImage,

                                   xoffset, yoffset, slice,

                                     rb, x, y, width, height);

    }

}