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4ed_directx_render.cpp: Initialize textures to zero to avoid having random pixel values that changes the result of linear sampling on the edge of characters.

This commit is contained in:
Simon Anciaux 2024-02-28 13:33:52 +01:00 committed by Peter Slattery
parent e4b4e5c943
commit b651847ba3
1 changed files with 19 additions and 2 deletions
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21
code/platform_win32/4ed_directx_render.cpp
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@ -80,7 +80,24 @@ gl__get_texture(Vec3_i32 dim, Texture_Kind texture_kind){
texture_desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
texture_desc.CPUAccessFlags = 0; // D3D11_CPU_ACCESS_WRITE;
HRESULT hr = g_directx.device->CreateTexture2D( &texture_desc, 0, &texture->pointer );
// NOTE(simon, 28/02/24): I initialize the texture with zeros. In practice it doesn't seem
// to matter, but since the shader use a bilinear filter, the unitialized data in the
// texture could change the result of the filtering for texel at the edge of a character.
// We should probably change the rectangle packer to have at least 1 pixel border around
// characters to avoid filtering between characters. But no one noticed it so far, so it's
// probably not important.
D3D11_SUBRESOURCE_DATA* texture_data = push_array_zero( &win32vars.frame_arena, D3D11_SUBRESOURCE_DATA, dim.z );
u8* initial_data = push_array_zero( &win32vars.frame_arena, u8, dim.x * dim.y );
for ( i32 i = 0; i < dim.z; i++ ) {
texture_data[ i ].pSysMem = initial_data;
texture_data[ i ].SysMemPitch = dim.x;
}
HRESULT hr = g_directx.device->CreateTexture2D( &texture_desc, texture_data, &texture->pointer );
pop_array( &win32vars.frame_arena, u8, dim.x * dim.y );
pop_array( &win32vars.frame_arena, D3D11_SUBRESOURCE_DATA, dim.z );
if ( SUCCEEDED( hr ) ) {
hr = g_directx.device->CreateShaderResourceView( ( ID3D11Resource* ) texture->pointer, 0, &texture->view );
@ -132,7 +149,7 @@ gl__fill_texture(Texture_Kind texture_kind, u32 texture, Vec3_i32 p, Vec3_i32 di
box.bottom = p.y + dim.y;
box.front = 0;
box.back = 1;
u32 sub_resource_index = D3D11CalcSubresource( 0 /* MipSlice */, p.z /* ArraySlice */, 1 /* MipLevels */ );
g_directx.context->UpdateSubresource( tex->pointer, sub_resource_index, &box, data, dim.x, dim.x * dim.y );
}