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/*

 * Copyright (C) 2010 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 "stdint.h"

#include "main/bufferobj.h"

#include "main/enums.h"

#include "main/fbobject.h"

#include "main/image.h"

#include "main/readpix.h"

#include "main/state.h"

#include "radeon_common_context.h"

#include "radeon_buffer_objects.h"

#include "radeon_debug.h"

#include "radeon_mipmap_tree.h"

static mesa_format gl_format_and_type_to_mesa_format(GLenum format, GLenum type)

{

    switch (format)

    {

        case GL_RGB:

            switch (type) {

                case GL_UNSIGNED_SHORT_5_6_5:

                    return MESA_FORMAT_B5G6R5_UNORM;

                case GL_UNSIGNED_SHORT_5_6_5_REV:

                    return MESA_FORMAT_R5G6B5_UNORM;

            }

            break;

        case GL_RGBA:

            switch (type) {

                case GL_FLOAT:

                    return MESA_FORMAT_RGBA_FLOAT32;

                case GL_UNSIGNED_SHORT_5_5_5_1:

                    return MESA_FORMAT_A1B5G5R5_UNORM;

                case GL_UNSIGNED_INT_8_8_8_8:

                    return MESA_FORMAT_A8B8G8R8_UNORM;

                case GL_UNSIGNED_BYTE:

                case GL_UNSIGNED_INT_8_8_8_8_REV:

                    return MESA_FORMAT_R8G8B8A8_UNORM;

            }

            break;

        case GL_BGRA:

            switch (type) {

                case GL_UNSIGNED_SHORT_4_4_4_4:

                    return MESA_FORMAT_A4R4G4B4_UNORM;

                case GL_UNSIGNED_SHORT_4_4_4_4_REV:

                    return MESA_FORMAT_B4G4R4A4_UNORM;

                case GL_UNSIGNED_SHORT_5_5_5_1:

                    return MESA_FORMAT_A1R5G5B5_UNORM;

                case GL_UNSIGNED_SHORT_1_5_5_5_REV:

                    return MESA_FORMAT_B5G5R5A1_UNORM;

                case GL_UNSIGNED_INT_8_8_8_8:

                    return MESA_FORMAT_A8R8G8B8_UNORM;

                case GL_UNSIGNED_BYTE:

                case GL_UNSIGNED_INT_8_8_8_8_REV:

                    return MESA_FORMAT_B8G8R8A8_UNORM;

            }

            break;

    }

    return MESA_FORMAT_NONE;

}

static GLboolean

do_blit_readpixels(struct gl_context * ctx,

                   GLint x, GLint y, GLsizei width, GLsizei height,

                   GLenum format, GLenum type,

                   const struct gl_pixelstore_attrib *pack, GLvoid * pixels)

{

    radeonContextPtr radeon = RADEON_CONTEXT(ctx);

    const struct radeon_renderbuffer *rrb = radeon_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);

    const mesa_format dst_format = gl_format_and_type_to_mesa_format(format, type);

    unsigned dst_rowstride, dst_imagesize, aligned_rowstride, flip_y;

    struct radeon_bo *dst_buffer;

    GLint dst_x = 0, dst_y = 0;

    intptr_t dst_offset;

    /* It's not worth if number of pixels to copy is really small */

    if (width * height < 100) {

        return GL_FALSE;

    }

    if (dst_format == MESA_FORMAT_NONE ||

        !radeon->vtbl.check_blit(dst_format, rrb->pitch / rrb->cpp) || !radeon->vtbl.blit) {

        return GL_FALSE;

    }

    if (ctx->_ImageTransferState || ctx->Color.ColorLogicOpEnabled) {

        return GL_FALSE;

    }

    if (pack->SwapBytes || pack->LsbFirst) {

        return GL_FALSE;

    }

    if (pack->RowLength > 0) {

        dst_rowstride = pack->RowLength;

    } else {

        dst_rowstride = width;

    }

    if (!_mesa_clip_copytexsubimage(ctx, &dst_x, &dst_y, &x, &y, &width, &height)) {

        return GL_TRUE;

    }

    assert(x >= 0 && y >= 0);

    aligned_rowstride = get_texture_image_row_stride(radeon, dst_format, dst_rowstride, 0, GL_TEXTURE_2D);

    dst_rowstride *= _mesa_get_format_bytes(dst_format);

    if (_mesa_is_bufferobj(pack->BufferObj) && aligned_rowstride != dst_rowstride)

        return GL_FALSE;

    dst_imagesize = get_texture_image_size(dst_format,

                                           aligned_rowstride,

                                           height, 1, 0);

    if (!_mesa_is_bufferobj(pack->BufferObj))

    {

        dst_buffer = radeon_bo_open(radeon->radeonScreen->bom, 0, dst_imagesize, 1024, RADEON_GEM_DOMAIN_GTT, 0);

        dst_offset = 0;

    }

    else

    {

        dst_buffer = get_radeon_buffer_object(pack->BufferObj)->bo;

        dst_offset = (intptr_t)pixels;

    }

    /* Disable source Y flipping for FBOs */

    flip_y = _mesa_is_winsys_fbo(ctx->ReadBuffer);

    if (pack->Invert) {

        y = rrb->base.Base.Height - height - y;

        flip_y = !flip_y;

    }

    if (radeon->vtbl.blit(ctx,

                          rrb->bo,

                          rrb->draw_offset,

                          rrb->base.Base.Format,

                          rrb->pitch / rrb->cpp,

                          rrb->base.Base.Width,

                          rrb->base.Base.Height,

                          x,

                          y,

                          dst_buffer,

                          dst_offset,

                          dst_format,

                          aligned_rowstride / _mesa_get_format_bytes(dst_format),

                          width,

                          height,

                          0, /* dst_x */

                          0, /* dst_y */

                          width,

                          height,

                          flip_y))

    {

        if (!_mesa_is_bufferobj(pack->BufferObj))

        {

            radeon_bo_map(dst_buffer, 0);

            copy_rows(pixels, dst_rowstride, dst_buffer->ptr,

                      aligned_rowstride, height, dst_rowstride);

            radeon_bo_unmap(dst_buffer);

            radeon_bo_unref(dst_buffer);

        }

        return GL_TRUE;

    }

    if (!_mesa_is_bufferobj(pack->BufferObj))

        radeon_bo_unref(dst_buffer);

    return GL_FALSE;

}

void

radeonReadPixels(struct gl_context * ctx,

                 GLint x, GLint y, GLsizei width, GLsizei height,

                 GLenum format, GLenum type,

                 const struct gl_pixelstore_attrib *pack, GLvoid * pixels)

{

    radeonContextPtr radeon = RADEON_CONTEXT(ctx);

    radeon_prepare_render(radeon);

    if (do_blit_readpixels(ctx, x, y, width, height, format, type, pack, pixels))

        return;

    /* Update Mesa state before calling _mesa_readpixels().

     * XXX this may not be needed since ReadPixels no longer uses the

     * span code.

     */

    radeon_print(RADEON_FALLBACKS, RADEON_NORMAL,

                 "Falling back to sw for ReadPixels (format %s, type %s)\n",

                 _mesa_lookup_enum_by_nr(format), _mesa_lookup_enum_by_nr(type));

    if (ctx->NewState)

        _mesa_update_state(ctx);

    _mesa_readpixels(ctx, x, y, width, height, format, type, pack, pixels);

}