using OptimeGBA;
using System;
using System.Runtime.InteropServices;
using UnityEngine;
using UnityEngine.UI;


public class VideoProvider : MonoBehaviour
{
    public RawImage m_drawCanvas;
    private RectTransform m_drawCanvasrect;
    private IntPtr wrapTexBufferPointer;
    private Texture2D wrapTex;
    private int TexBufferSize;

    uint[] wrapTexBuffer = new uint[240 * 160];
    //Color32[] DisplayColorBuffer = new Color32[240 * 160];

    private void Awake()
    {
        if (wrapTex == null)
        {
            wrapTex = new Texture2D(240, 160, TextureFormat.RGBA32, false);
            wrapTex.filterMode = FilterMode.Point;
            //wrapTexBuffer = screenData;

            // 固定数组，防止垃圾回收器移动它  
            GCHandle handle = GCHandle.Alloc(wrapTexBuffer, GCHandleType.Pinned);
            // 获取数组的指针  
            wrapTexBufferPointer = handle.AddrOfPinnedObject();
            m_drawCanvas.texture = wrapTex;
            TexBufferSize = wrapTexBuffer.Length * 4;


            m_drawCanvasrect = m_drawCanvas.GetComponent<RectTransform>();
            float targetWidth = ((float)240 / 160) * m_drawCanvasrect.rect.height;
            m_drawCanvasrect.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, targetWidth);

        }
    }

    public void OnRenderFrame()
    {
        var buf = Emulator.instance.ShowBackBuf ? Emulator.instance.gba.Ppu.Renderer.ScreenBack : Emulator.instance.gba.Ppu.Renderer.ScreenFront;
        unsafe
        {
            for (uint i = 0; i < 240 * 160; i++)
            {
                wrapTexBuffer[i] = PpuRenderer.ColorLutCorrected[buf[i] & 0x7FFF];
                //fixed (uint* p = &wrapTexBuffer[i])
                //{
                //    byte* bp = (byte*)p;
                //    DisplayColorBuffer[i] = new Color32(*(bp++), *(bp++), *(bp++), *(bp++));
                //}
            }
        }

        wrapTex.LoadRawTextureData(wrapTexBufferPointer, TexBufferSize);
        //wrapTex.SetPixels32(DisplayColorBuffer, 0);
        wrapTex.Apply();
    }
}