|
/***************************************************************************/
/*
*/
/* File: game.cpp
*/
/*
*/
/***************************************************************************/
#include
<d3dx8.h>
#include
<d3d8.h>
// These two items, the struct and the UINT, are the defentions of a single
// vertex point in space!.. the UINT is for directX so it knows what we
want.
struct
my_vertex
{
FLOAT x, y, z; // D3DFVF_XYZ
DWORD colour; // D3DFVF_DIFFUSE
};
UINT
my_vertex_description = (D3DFVF_XYZ | D3DFVF_DIFFUSE);
// Well if we need to do any drawing or rendering triangles we can do it in
here!
void
Render()
{
if(!g_pD3DDevice)return;
/* 1-Create the points that will represent our
triangle */
// struct we declared earlier.
// | array of elements of type my_vertex.
// | |
// \ / \ /
// | |
my_vertex v[] =
{
// Three points make up the face of the triangle.
{-1.0f,-1.0f, 0.0f, 0xffffff00},
//[1]
{0.0f, 1.0f, 0.0f, 0xffff2200},
//[2]
{1.0f, -1.0f, 0.0f, 0xffffff00}
//[3]
};
/* * - [2]
(0,1,0)
* *
* *
* *
* *
* *
[1] (-1,-1,0) - * * * * * * * - [3] (1,-1,0). */
// The pointer to memory on the graphics card you
can think of it as.. stops you getting
// confused... but its not exactly correct! But
we'll get to that later.
IDirect3DVertexBuffer8 * DX_vb;
g_pD3DDevice->CreateVertexBuffer( 3*sizeof(my_vertex),
0, my_vertex_description, D3DPOOL_MANAGED, &DX_vb );
// Copy our array which is in computer memory over
to the directX memory.. using that pointer we
// just created etc.
unsigned char
*temp_pointer_vb;
DX_vb->Lock(0,0, &temp_pointer_vb, 0);
memcpy(temp_pointer_vb, v, sizeof(v) );
DX_vb->Unlock();
// Okay at this point... our graphics card has our
vertices stored in it... we've just copied
// them over :)
// Some stuff to setup or graphics card!
//Turn off lighting becuase we are specifying that
our vertices have colour
g_pD3DDevice->SetRenderState(D3DRS_LIGHTING, FALSE);
g_pD3DDevice->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_SELECTARG1);
g_pD3DDevice->SetTextureStageState(0,D3DTSS_COLORARG1, D3DTA_DIFFUSE);
// Clear the back buffer to a blue color
g_pD3DDevice->Clear( 0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER,
D3DCOLOR_XRGB(0,0,255), 1.0f, 0 );
// Draw our triangle.
g_pD3DDevice->SetStreamSource(0, DX_vb, sizeof(my_vertex));
g_pD3DDevice->SetVertexShader(my_vertex_description);
g_pD3DDevice->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);
// After rendering the scene we display it.
g_pD3DDevice->Present( NULL, NULL, NULL, NULL );
// As where calling the functino over and over
again.. we'd be constantly creating new memory
// without releasing the old if not for this line!
DX_vb->Release();
}
void
mainloop()
{
Render();
} |
