I am working a bit on a 2d - direct3D project, and ran into a little problem.
I got the following code for rendering sprites:
bool GEP_Core::Graphics_RenderSprite( GEP_Sprite sprite )
{
CUSTOMVERTEX vertices[6];
//Fill vertices with data from sprite class.
Graphics_FillVertex( &vertices, &sprite );
//Add vertice data to buffer.
VOID* pVertices;
if( FAILED( pVertexBuffer->Lock( 0, sizeof(vertices), (VOID**)&pVertices, 0 ) ) )
return false;
memcpy( pVertices, vertices, sizeof(vertices) );
pVertexBuffer->Unlock();
//Recieve texture to use.
LPDIRECT3DTEXTURE9 tex = sprite.GetTexture()->GetTexturePointer();
//Set texture to use, and draw the sprite.
pD3DDevice->SetTexture( 0, tex );
pD3DDevice->DrawPrimitive( D3DPT_TRIANGLELIST, 0, 2 );
//Completed successfully.
return true;
}
And the following code for loading textures:
bool GEP_Core::Texture_Load( GEP_Texture *texture, std::string filename )
{
//GEP_Texture texture;
LPDIRECT3DTEXTURE9 tex;
//Get image info and validate existence.
D3DXIMAGE_INFO imageInfo;
if( FAILED(D3DXGetImageInfoFromFile( filename.c_str(), &imageInfo )) )
return false;
//Load texture from file.
D3DXCreateTextureFromFileEx( pD3DDevice,
filename.c_str(),
imageInfo.Width,
imageInfo.Height,
1,
0,
D3DFMT_A8R8G8B8,
D3DPOOL_MANAGED,
D3DX_DEFAULT,
D3DX_DEFAULT,
Settings_GetTransparentColor(),
NULL,
NULL,
&tex);
//Store texture data in texture storage.
texture->SetTextureAreaSize( imageInfo.Width, imageInfo.Height );
texture->SetTexture( tex );
//Completed successfully.
return true;
}
In the rendering function, I receive the spritedata from the spriteclass passed to it, like positioning, size, texture to use and z-value.
My problem is related to transparency and the z-value, which I use to specify top-priority for sprites.
If I first render a sprite with z-value 0 (closest to the screen), and afterwards render a new sprite with z-value 1 (furthest away), at the same position as the first, the transparency color of the first sprite will cover up the graphics from the sprite with z-value 1.
To try to illustrate it, it is looking somewhat like this:
.___
|1 _|__
|..|...|
|__|..0|
...|___|
When it should have looked something like this:
.___
|1..|__
|...|..|
|__|..0|
...|___|
If I render the sprite with z-value 1 first, and afterwards render the one with z-value 0, this problem does not occur.
So, my problem in all simplicy is that when I render a sprite with z-value 1, I can't render over its transparency color with a sprite with z-value 0.
I hope theres someone out there who understand what I'm trying to explain, and that someone can tell my why this is happening, and if there is a way to solve it.
- Thanks, TT
