• Announcements

    • khawk

      Download the Game Design and Indie Game Marketing Freebook   07/19/17

      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.
Sign in to follow this  
Followers 0
TransformedBG

one star instead of many...

2 posts in this topic

Im just trying to make the old flying through space screen saver in direct X and could use a little help.

oh the star is just a basic struct:
[code]struct STAR
{
float x; // Star X Posistion
float y; // Star Y Posistion
float z; // Star Z Position
float velocity; // Star Velocity
int direction;
DWORD color; // Star Color
bool hyperspace; //boost?
};
[/code]

global variables
[code]//Stars
IDirect3DVertexBuffer9 * star_VB;
const int TOTAL_STARS = 250;
STAR stars[TOTAL_STARS]; //star vertex
float star_velocity = 0.1f;
const int Far_Depth = 100;
const int Near_Depth = 20;[/code]

//how i create my star[code]bool createStars(IDirect3DDevice9* device, const int Height, const int Width)
{
D3DXMATRIX proj;
D3DXMatrixPerspectiveFovLH(&proj,D3DX_PI * 0.25f , (float)Width/(float)Height, 0.01f, 1000.0f);//45, 1.0f, 0.1f, 500.0f));
device->SetTransform(D3DTS_PROJECTION,&proj);
time_t now = time(0);
srand((unsigned int )&now);
D3DXMATRIX V;
D3DXMatrixIdentity(&V);
device->SetTransform(D3DTS_WORLD,&V);
device->SetTransform(D3DTS_VIEW, &V);
for(int i=0; i < TOTAL_STARS;i++)
{
stars[i].z -= star_velocity;
stars[i].x = 30.0f - (rand()%60);
stars[i].y = 30.0f - (rand()%60);

stars[i].z = Near_Depth + (float)(rand()%(Far_Depth - Near_Depth));
stars[i].color = d3d::WHITE;
}
return true;
}[/code]

which i call in my winMain:
[code]// WinMain
int WINAPI WinMain(HINSTANCE hinstance, HINSTANCE prevInstance, PSTR cmdLine, int showCmd)
{
main_instance = hinstance;
if(!d3d::InitD3D(hinstance, Width, Height, true, D3DDEVTYPE_HAL, &Device))
{
::MessageBox(0, "InitD3D() - FAILED", 0, 0);
return 0;
}

if(!Setup())
{
::MessageBox(0, "Setup() - FAILED", 0, 0);
return 0;
}
bool test = true;
test = createStars(Device,Height,Width);

if(test == false)
{
::MessageBox(0, "createStars() - FAILED",0,0);
return 0;
}
d3d::EnterMsgLoop(Display);
Cleanup();
Device->Release();
return 0;
}[/code]

and i call the function render() in my display
[code]bool render(IDirect3DDevice9* device)
{
if(!device)return false;
moveStars(device);

device->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, d3d::BLACK, 1.0f,0);
device->BeginScene();
renderStars(device);

device->EndScene();
return true;
}[/code]

which calls movestars:
[code]void moveStars(IDirect3DDevice9* device)
{
for(int i = 0; i < TOTAL_STARS; i++)
{
//move the star
stars[i].z -= star_velocity;

if(stars[i].z <= Near_Depth) stars[i].z = Far_Depth;
if(stars[i].direction == 2)
{
stars[i].x += 0.1f;
}
}
}[/code]

then renders them:
[code]void renderStars(IDirect3DDevice9* device)
{
device->SetRenderState(D3DRS_LIGHTING,FALSE);
device->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_SELECTARG1);
device->SetTextureStageState(0, D3DTSS_COLORARG1,D3DTA_DIFFUSE);
device->CreateVertexBuffer(TOTAL_STARS*sizeof(stars),D3DUSAGE_WRITEONLY, CUSTOMFVF,D3DPOOL_MANAGED,&star_VB,NULL);

VOID* temp_pointer_vb;
star_VB->Lock(0,TOTAL_STARS*sizeof(stars),&temp_pointer_vb,0);
memcpy(temp_pointer_vb,stars,TOTAL_STARS);
star_VB->Unlock();
device->SetStreamSource(0,star_VB,0,sizeof(stars));
device->SetFVF(CUSTOMFVF);
device->DrawPrimitive(D3DPT_POINTLIST,0,TOTAL_STARS);
star_VB->Release();
}[/code]

Now problem im having is im only rendering 1 star somewhere on the screen over and over again... so the move function is obviously working... Problem is that it should be rendering 250 stars..

Just wondering if someone might have some thoughts on this..
0

Share this post


Link to post
Share on other sites
[quote name='TransformedBG' timestamp='1328753402' post='4911159']
memcpy(temp_pointer_vb,stars,TOTAL_STARS);

device->SetStreamSource(0,star_VB,0,sizeof(stars));
[/quote]

your memcpy has incorrect size : the last parameter should be TOTAL_STARS* sizeof(STAR)
SetStreamSource : the last parameter (vertex stride) should be sizeof(STAR) ie. size of a single vertex

Cheers!
1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0