Hi there,
I'm very new to Direct3D and I'm about to tear my head apart. I've taken a little sample Direct3D app and modified it a bit to my liking. So I have a couple of X models loaded and a camera that I can move with DirectInput. Now I was about to do a gui (HUD) and I'm trying to do a simple vertexbuffer with 4 vertices in screen space and then draw a trianglestrip of two primitives.
I want to do this in a new class called CGui. Here's the code:
gui.h
#ifndef GUI_H
#define GUI_H
#include <d3d9.h>
#include <d3dx9.h>
#define D3DFVF_GUIFVF (D3DFVF_XYZRHW | D3DFVF_DIFFUSE | D3DFVF_TEX1)
struct GuiVertex
{
float x, y, z, rhw;
DWORD color;
float tu, tv;
};
class CGui
{
LPDIRECT3DDEVICE9 d3dDevice;
LPDIRECT3DVERTEXBUFFER9 vb;
LPDIRECT3DTEXTURE9 texture;
GuiVertex *verts;
public:
CGui();
~CGui();
HRESULT Init(LPDIRECT3DDEVICE9 device);
HRESULT DeInit();
HRESULT Render();
};
#endif
gui.cpp
#include <d3d9.h>
#include <d3dx9.h>
#include "constants.h"
#include "gui.h"
CGui::CGui()
{
vb = NULL;
verts = NULL;
texture = NULL;
}
CGui::~CGui()
{
SafeRelease(vb);
SafeRelease(texture);
SafeDeleteArray(verts);
}
HRESULT CGui::Init(LPDIRECT3DDEVICE9 device)
{
void *tempVerts = NULL;
d3dDevice = device; // Assign our CGui::d3dDevice so we can use it in other CGui functions.
verts = new GuiVertex[4];
// CW Order
verts[0].x = 100.0f; verts[0].y = 100.0f; verts[0].z = 0.0f; verts[0].rhw = 1.0f; verts[0].color = D3DCOLOR_ARGB(255, 255, 0, 0); verts[0].tu = 0.0f; verts[0].tv = 0.0f;
verts[1].x = 400.0f; verts[1].y = 100.0f; verts[1].z = 0.0f; verts[1].rhw = 1.0f; verts[1].color = D3DCOLOR_ARGB(255, 0, 255, 0); verts[1].tu = 1.0f; verts[1].tv = 0.0f;
verts[2].x = 100.0f; verts[2].y = 400.0f; verts[2].z = 0.0f; verts[2].rhw = 1.0f; verts[2].color = D3DCOLOR_ARGB(255, 0, 0, 255); verts[2].tu = 0.0f; verts[2].tv = 1.0f;
verts[3].x = 400.0f; verts[3].y = 400.0f; verts[3].z = 0.0f; verts[3].rhw = 1.0f; verts[3].color = D3DCOLOR_ARGB(255, 255, 255, 255); verts[3].tu = 1.0f; verts[3].tv = 1.0f;
D3DXCreateTextureFromFile(d3dDevice, "data/textures/gui.dds", &texture);
d3dDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
d3dDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
// D3DPOOL_DEFAULT makes the app hang? O.o
d3dDevice->CreateVertexBuffer(4 * sizeof(GuiVertex), D3DUSAGE_WRITEONLY, D3DFVF_GUIFVF, D3DPOOL_MANAGED, &vb, NULL);
vb->Lock(0, sizeof(verts), (void**)&tempVerts, 0);
memcpy(tempVerts, verts, sizeof(verts));
vb->Unlock();
return S_OK;
}
HRESULT CGui::DeInit()
{
SafeRelease(vb);
SafeRelease(texture);
SafeDeleteArray(verts);
return S_OK;
}
HRESULT CGui::Render()
{
d3dDevice->SetTexture(0, texture);
d3dDevice->SetStreamSource(0, vb, 0, sizeof(GuiVertex));
d3dDevice->SetFVF(D3DFVF_GUIFVF);
// Just draw the first triangle (should be a TRIANGLESTRIP but for bug searching reasons...)
d3dDevice->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);
return S_OK;
}
So as you see I send the d3dDevice pointer to CGui::init so that CGui:s other functions can use it (as render for example). Then I create my vertices, load a texture, create a vertexbuffer, lock the vertex buffer and copy the vertice data to the vertex buffer and finally unlock it.
When I render it I render as a single triangle because I'm not sure that the trianglestrip would work correctly. I've also tried to cull both CCW and CW but that is not the problem.
