/*  Starshatter OpenSource Distribution
    Copyright (c) 1997-2004, Destroyer Studios LLC.
    All Rights Reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name "Destroyer Studios" nor the names of its contributors
      may be used to endorse or promote products derived from this software
      without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

    SUBSYSTEM:    nGenEx.lib
    FILE:         VideoDX9VertexBuffer.cpp
    AUTHOR:       John DiCamillo


    OVERVIEW
    ========
    Direct3D Video class for DirectX 9
*/

#include "MemDebug.h"
#include "VideoDX9VertexBuffer.h"
#include "Color.h"

// +--------------------------------------------------------------------+

void                 VideoDX9Error(const char* msg, HRESULT dderr);
extern int           VD3D_describe_things;

#ifndef RELEASE
#define RELEASE(x) if (x) { x->Release(); x=NULL; }
#endif

// +--------------------------------------------------------------------+

VideoDX9VertexBuffer::VideoDX9VertexBuffer(VideoDX9*   dx9,
UINT        nverts,
UINT        vsize,
DWORD       format,
DWORD       usage)
: video(dx9), vertex_buffer(0),
num_verts(nverts), num_locked(0), vert_size(vsize), next_vert(0),
is_dynamic(false)
{
    UINT len = num_verts * vert_size;

    if (video && len) {
        is_dynamic   = (usage & D3DUSAGE_DYNAMIC) ? true : false;
        D3DPOOL pool = is_dynamic ? D3DPOOL_DEFAULT : D3DPOOL_MANAGED;

        HRESULT hr = video->D3DDevice()->CreateVertexBuffer(len, 
        usage,
        format,
        pool,
        &vertex_buffer,
        0);

        if (FAILED(hr)) {
            static int report = 10;
            if (report) {
                VideoDX9Error("Could not create vertex buffer.", hr);
                report--;
            }

            num_verts = 0;
            vert_size = 0;
            next_vert = 0;
        }
    }
}

VideoDX9VertexBuffer::~VideoDX9VertexBuffer()
{
    RELEASE(vertex_buffer);
}

// +--------------------------------------------------------------------+

BYTE*
VideoDX9VertexBuffer::Lock(UINT count)
{
    if (vertex_buffer && count <= num_verts) {
        DWORD flags = 0;

        if (count == 0)
        count = num_verts;
        
        if (is_dynamic) {
            flags = D3DLOCK_NOOVERWRITE;

            if (next_vert + count > num_verts) {
                next_vert = 0;
                flags = D3DLOCK_DISCARD;
            }
        }

        void*    result = 0;
        HRESULT  hr     = 0;

        hr = vertex_buffer->Lock(next_vert * vert_size,
        count     * vert_size,
        &result,
        flags);

        if (SUCCEEDED(hr)) {
            num_locked = count;
            return (BYTE*) result;
        }
    }

    return 0;
}

void
VideoDX9VertexBuffer::Unlock()
{
    if (vertex_buffer && num_locked > 0) {
        vertex_buffer->Unlock();

        next_vert  += num_locked;
        num_locked = 0;
    }
}

bool
VideoDX9VertexBuffer::Select(int stream)
{
    if (video && vertex_buffer) {
        HRESULT hr = E_FAIL;

        if (num_locked > 0)
        Unlock();

        hr = video->D3DDevice()->SetStreamSource(stream,
        vertex_buffer,
        0,
        vert_size);

        if (SUCCEEDED(hr))
        return true;
    }

    return false;
}

// +--------------------------------------------------------------------+

UINT
VideoDX9VertexBuffer::GetNumVerts() const
{
    return num_verts;
}

UINT
VideoDX9VertexBuffer::GetVertSize() const
{
    return vert_size;
}

UINT
VideoDX9VertexBuffer::GetNextVert() const
{
    return next_vert;
}


// +--------------------------------------------------------------------+
// +--------------------------------------------------------------------+
// +--------------------------------------------------------------------+


VideoDX9IndexBuffer::VideoDX9IndexBuffer(VideoDX9*   dx9,
UINT        nind,
DWORD       usage)
: video(dx9), index_buffer(0), 
num_indices(nind), num_locked(0), next_index(0),
is_dynamic(false)
{
    UINT len = num_indices * sizeof(WORD);

    if (video && len) {
        is_dynamic   = (usage & D3DUSAGE_DYNAMIC) ? true : false;
        D3DPOOL pool = is_dynamic ? D3DPOOL_DEFAULT : D3DPOOL_MANAGED;

        HRESULT hr = video->D3DDevice()->CreateIndexBuffer(len, 
        usage,
        D3DFMT_INDEX16,
        pool,
        &index_buffer,
        0);

        if (FAILED(hr)) {
            static int report = 10;
            if (report) {
                VideoDX9Error("Could not create index buffer.", hr);
                report--;
            }

            num_indices = 0;
            next_index  = 0;
        }
    }
}

VideoDX9IndexBuffer::~VideoDX9IndexBuffer()
{
    RELEASE(index_buffer);
}

// +--------------------------------------------------------------------+

WORD*
VideoDX9IndexBuffer::Lock(UINT count)
{
    if (index_buffer && count <= num_indices) {
        DWORD flags = 0;

        if (count == 0)
        count = num_indices;
        
        if (is_dynamic) {
            flags = D3DLOCK_NOOVERWRITE;

            if (next_index + count > num_indices) {
                next_index = 0;
                flags = D3DLOCK_DISCARD;
            }
        }

        void*    result = 0;
        HRESULT  hr     = 0;

        hr = index_buffer->Lock(next_index * 2,
        count      * 2,
        &result,
        flags);

        if (SUCCEEDED(hr)) {
            num_locked = count;
            return (WORD*) result;
        }
    }

    return 0;
}

void
VideoDX9IndexBuffer::Unlock()
{
    if (index_buffer && num_locked > 0) {
        index_buffer->Unlock();

        next_index += num_locked;
        num_locked = 0;
    }
}

bool
VideoDX9IndexBuffer::Select()
{
    if (video && index_buffer) {
        if (num_locked > 0)
        Unlock();

        HRESULT hr = video->D3DDevice()->SetIndices(index_buffer);

        if (SUCCEEDED(hr))
        return true;
    }

    return false;
}

// +--------------------------------------------------------------------+

UINT
VideoDX9IndexBuffer::GetNumIndices() const
{
    return num_indices;
}

UINT
VideoDX9IndexBuffer::GetNextIndex() const
{
    return next_index;
}