sdl 画yuv

#include <stdlib.h>
#include <stdio.h>
#include <math.h>

#include "SDL.h"
#include "CGSdlRender.h"
using namespace ChunGen::Client::Player;
int width = 1280;
int height = 720;


int frame_size_y = width * height;
int frame_size_uv = ((width + 1) >> 1) * ((height + 1) >> 1);
int frame_size = frame_size_y + 2 * frame_size_uv;
char buf[1280 * 720 * 2] = { 0 };//实际用不了这么多

int
main(int argc, char* argv[]) {

    std::shared_ptr<CGSDLRender> sdlRender = std::make_shared<CGSDLRender>();
    sdlRender->InitVideo(0);
    sdlRender->CreateVideoSurface(width, height);

    int mSize = frame_size;
    BYTE* data[3] = { NULL };
    int linesize[5] = { 1280,640,640,0,0 };
    int color = 0;

    data[0] = (BYTE*)buf;
    data[1] = (BYTE*)(buf + frame_size_y);
    data[2] = (BYTE*)(buf + frame_size_y + frame_size_uv);
    memset(data[1], 128, frame_size_y);
    while (color <25 ) {
        //mSize = fread(buf, frame_size, 1, f);
        memset(buf,color*10, frame_size_y);
        color++;

        sdlRender->Display((uint8_t**)data, linesize);
        SDL_Delay(500);
        printf("myplay --%d\n",color);
    };

    return 0;
}

比如画正弦波形

    data[0] = (BYTE*)buf;
    data[1] = (BYTE*)(buf + frame_size_y);
    data[2] = (BYTE*)(buf + frame_size_y + frame_size_uv);
    memset(buf,0, frame_size_y);
    memset(data[1], 128, frame_size_y);
    
    for (int j = 0; j < 720; j++) {
        for (int i = 0; i < 1280; i++) {
          
            if (j < 240 - 240 * sin(3.14 * i / 180))
                buf[j * 1280 + i] = 255;
            else
                buf[j * 1280 + i] = 0;
        }
    }

sdl  mac---