DX9SDL2.cpp

#include <d3d9.h>
#include <d3dx9.h>

#include <windowsx.h>
#include <windows.h>

#include <SDL2/SDL.h>
#include <SDL2/SDL_main.h>

using namespace std;

LPDIRECT3D9 d3d;
LPDIRECT3DDEVICE9 d3ddev;
LPDIRECT3DVERTEXBUFFER9 v_buffer = NULL;
LPDIRECT3DINDEXBUFFER9 i_buffer = NULL;

// function prototypes
void initD3D(HWND hWnd);
void render_frame(void);
void init_graphics(void);
void init_light(void);    // sets up the light and the material

struct CUSTOMVERTEX {FLOAT X, Y, Z; D3DVECTOR NORMAL;};
#define CUSTOMFVF (D3DFVF_XYZ | D3DFVF_NORMAL)

// this is the function used to render a single frame
void render_frame(void)
{
    d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);
    d3ddev->Clear(0, NULL, D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);

    d3ddev->BeginScene();

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

    // set the view transform
    D3DXMATRIX matView;
    
    static const D3DXVECTOR3 vec1 (0.0f, 8.0f, 25.0f);    // the camera position
    static const D3DXVECTOR3 vec2 (0.0f, 0.0f, 0.0f);      // the look-at position
    static const D3DXVECTOR3 vec3 (0.0f, 1.0f, 0.0f);    // the up direction
    D3DXMatrixLookAtLH(&matView, &vec1, &vec2, &vec3);
    d3ddev->SetTransform(D3DTS_VIEW, &matView);

    // set the projection transform
    D3DXMATRIX matProjection;
    D3DXMatrixPerspectiveFovLH(&matProjection,
                               D3DXToRadian(45),
                               (FLOAT)1920 / (FLOAT)1080,
                               1.0f,    // the near view-plane
                               100.0f);    // the far view-plane
    d3ddev->SetTransform(D3DTS_PROJECTION, &matProjection);

    // set the world transform
    static float index = 0.0f; index+=0.03f;
    D3DXMATRIX matRotateY;
    D3DXMatrixRotationY(&matRotateY, index);
    d3ddev->SetTransform(D3DTS_WORLD, &(matRotateY));

    // select the vertex and index buffers to use
    d3ddev->SetStreamSource(0, v_buffer, 0, sizeof(CUSTOMVERTEX));
    d3ddev->SetIndices(i_buffer);

    // draw the cube
    d3ddev->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, 24, 0, 12); 

    d3ddev->EndScene(); 

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


// this is the function that puts the 3D models into video RAM
void init_graphics(void)
{
    // create the vertices using the CUSTOMVERTEX struct
    CUSTOMVERTEX vertices[] =
    {
        { -3.0f, -3.0f, 3.0f, 0.0f, 0.0f, 1.0f, },    // side 1
        { 3.0f, -3.0f, 3.0f, 0.0f, 0.0f, 1.0f, },
        { -3.0f, 3.0f, 3.0f, 0.0f, 0.0f, 1.0f, },
        { 3.0f, 3.0f, 3.0f, 0.0f, 0.0f, 1.0f, },

        { -3.0f, -3.0f, -3.0f, 0.0f, 0.0f, -1.0f, },    // side 2
        { -3.0f, 3.0f, -3.0f, 0.0f, 0.0f, -1.0f, },
        { 3.0f, -3.0f, -3.0f, 0.0f, 0.0f, -1.0f, },
        { 3.0f, 3.0f, -3.0f, 0.0f, 0.0f, -1.0f, },

        { -3.0f, 3.0f, -3.0f, 0.0f, 1.0f, 0.0f, },    // side 3
        { -3.0f, 3.0f, 3.0f, 0.0f, 1.0f, 0.0f, },
        { 3.0f, 3.0f, -3.0f, 0.0f, 1.0f, 0.0f, },
        { 3.0f, 3.0f, 3.0f, 0.0f, 1.0f, 0.0f, },

        { -3.0f, -3.0f, -3.0f, 0.0f, -1.0f, 0.0f, },    // side 4
        { 3.0f, -3.0f, -3.0f, 0.0f, -1.0f, 0.0f, },
        { -3.0f, -3.0f, 3.0f, 0.0f, -1.0f, 0.0f, },
        { 3.0f, -3.0f, 3.0f, 0.0f, -1.0f, 0.0f, },

        { 3.0f, -3.0f, -3.0f, 1.0f, 0.0f, 0.0f, },    // side 5
        { 3.0f, 3.0f, -3.0f, 1.0f, 0.0f, 0.0f, },
        { 3.0f, -3.0f, 3.0f, 1.0f, 0.0f, 0.0f, },
        { 3.0f, 3.0f, 3.0f, 1.0f, 0.0f, 0.0f, },

        { -3.0f, -3.0f, -3.0f, -1.0f, 0.0f, 0.0f, },    // side 6
        { -3.0f, -3.0f, 3.0f, -1.0f, 0.0f, 0.0f, },
        { -3.0f, 3.0f, -3.0f, -1.0f, 0.0f, 0.0f, },
        { -3.0f, 3.0f, 3.0f, -1.0f, 0.0f, 0.0f, },
    };

    // create a vertex buffer interface called v_buffer
    d3ddev->CreateVertexBuffer(24*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();

    // create the indices using an int array
    short indices[] =
    {
        0, 1, 2,    // side 1
        2, 1, 3,
        4, 5, 6,    // side 2
        6, 5, 7,
        8, 9, 10,    // side 3
        10, 9, 11,
        12, 13, 14,    // side 4
        14, 13, 15,
        16, 17, 18,    // side 5
        18, 17, 19,
        20, 21, 22,    // side 6
        22, 21, 23,
    };

    // create an index buffer interface called i_buffer
    d3ddev->CreateIndexBuffer(36*sizeof(short),
                              0,
                              D3DFMT_INDEX16,
                              D3DPOOL_MANAGED,
                              &i_buffer,
                              NULL);

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


// this is the function that sets up the lights and materials
void init_light(void)
{
    D3DLIGHT9 light;    // create the light struct
    D3DMATERIAL9 material;    // create the material struct

    ZeroMemory(&light, sizeof(light));    // clear out the light struct for use
    light.Type = D3DLIGHT_DIRECTIONAL;    // make the light type 'directional light'
    light.Diffuse = D3DXCOLOR(0.5f, 0.5f, 0.5f, 1.0f);    // set the light's color
    light.Direction = D3DXVECTOR3(-1.0f, -0.3f, -1.0f);

    d3ddev->SetLight(0, &light);    // send the light struct properties to light #0
    d3ddev->LightEnable(0, TRUE);    // turn on light #0

    ZeroMemory(&material, sizeof(D3DMATERIAL9));    // clear out the struct for use
    material.Diffuse = D3DXCOLOR(1.0f, 1.0f, 1.0f, 1.0f);    // set diffuse color to white
    material.Ambient = D3DXCOLOR(1.0f, 1.0f, 1.0f, 1.0f);    // set ambient color to white

    d3ddev->SetMaterial(&material);    // set the globably-used material to &material
}

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,
        1920,
        1080,
        SDL_WINDOW_FULLSCREEN);

    renderer = SDL_CreateRenderer(
        window,
        -1,
        SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);

    d3ddev = SDL_RenderGetD3D9Device(renderer);

    init_graphics();
    init_light();

    d3ddev->SetRenderState(D3DRS_LIGHTING, TRUE);    // turn on the 3D lighting
    d3ddev->SetRenderState(D3DRS_ZENABLE, TRUE);    // turn on the z-buffer
    d3ddev->SetRenderState(D3DRS_AMBIENT, D3DCOLOR_XRGB(50, 50, 50));
    while (true) 
    {
        SDL_PollEvent(&event);
        if (event.type == SDL_QUIT ||
                (event.type == SDL_KEYDOWN && event.key.keysym.sym == SDLK_ESCAPE)) 
        {
            v_buffer->Release();
            i_buffer->Release(); 
            d3ddev->Release();
            break;
        }
        render_frame();
    }

    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    if (d3d)
        d3d->Release();

    SDL_Quit();

    return 0;
}