example SDL2 Direct3D9 application

main.cpp

// g++ *.cpp -o d3d9 -lmingw32 -lSDL2main -lSDL2 -I/dxsdk/include -L/dxsdk/lib -DUNICODE -ld3d9 -ld3dx9
// http://blog.fourthwoods.com/2011/08/11/setting-up-mingw-for-directx/
// http://www.directxtutorial.com/Lesson.aspx?lessonid=9-4-4

#include <iostream>
using namespace std;

#include <SDL2/SDL.h>

#include <windows.h>
#include <d3d9.h>
#include <d3dx9.h>
IDirect3DDevice9* d3ddev;
LPDIRECT3DVERTEXBUFFER9 v_buffer = NULL;

struct CUSTOMVERTEX {FLOAT X, Y, Z, RHW; DWORD COLOR;};
#define CUSTOMFVF (D3DFVF_XYZRHW | D3DFVF_DIFFUSE)

void init_graphics(void)
{
    // create the vertices using the CUSTOMVERTEX struct
    CUSTOMVERTEX vertices[] =
    {
        { 400.0f, 62.5f, 0.5f, 1.0f, D3DCOLOR_XRGB(0, 0, 255), },
        { 650.0f, 500.0f, 0.5f, 1.0f, D3DCOLOR_XRGB(0, 255, 0), },
        { 150.0f, 500.0f, 0.5f, 1.0f, D3DCOLOR_XRGB(255, 0, 0), },
    };

    // create a vertex buffer interface called v_buffer
    d3ddev->CreateVertexBuffer(3*sizeof(CUSTOMVERTEX),
                               0,
                               CUSTOMFVF,
                               D3DPOOL_MANAGED,
                               &v_buffer,
                               NULL);

    VOID* pVoid;    // a void pointer

    // lock v_buffer and load the vertices into it
    v_buffer->Lock(0, 0, (void**)&pVoid, 0);
    memcpy(pVoid, vertices, sizeof(vertices));
    v_buffer->Unlock();
}

void render_frame(void)
{
    d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);

    d3ddev->BeginScene();

        // select which vertex format we are using
        d3ddev->SetFVF(CUSTOMFVF);

        // select the vertex buffer to display
        d3ddev->SetStreamSource(0, v_buffer, 0, sizeof(CUSTOMVERTEX));

        // copy the vertex buffer to the back buffer
        d3ddev->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);

    d3ddev->EndScene();

    d3ddev->Present(NULL, NULL, NULL, NULL);
}

int main(int argc, char *argv[])
{
    SDL_Window *window;
    SDL_Renderer *renderer;
    SDL_Event event;
    SDL_Init(SDL_INIT_VIDEO);
	
    window = SDL_CreateWindow("example SDL2 Direct3D9 application",SDL_WINDOWPOS_UNDEFINED,SDL_WINDOWPOS_UNDEFINED,800,600,SDL_WINDOW_RESIZABLE);
    renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
	
    //IDirect3DDevice9* Direct3D_device = SDL_RenderGetD3D9Device(renderer);
    d3ddev = SDL_RenderGetD3D9Device(renderer);
		
    init_graphics();

    while (true) 
    {
        SDL_PollEvent(&event);
        if (event.type == SDL_QUIT) 
        {
            d3ddev->Release();
            break;
        }
		
        render_frame();
    }

    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);

    SDL_Quit();

    return 0;
}