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Add alpha channel detection in stb texture importer

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This commit is contained in:
Wojtek Figat
2021-02-28 17:16:45 +01:00
parent 51e62c7e9d
commit 1be5815df3
1 changed files with 17 additions and 8 deletions
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25
Source/Engine/Tools/TextureTool/TextureTool.stb.cpp
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@@ -171,8 +171,8 @@ bool TextureTool::ImportTextureStb(ImageType type, const StringView& path, Textu
case ImageType::HDR:
case ImageType::TGA:
{
int x, y, comp;
stbi_uc* stbData = stbi_load_from_memory(fileData.Get(), fileData.Count(), &x, &y, &comp, 4);
int width, height, components;
stbi_uc* stbData = stbi_load_from_memory(fileData.Get(), fileData.Count(), &width, &height, &components, 4);
if (!stbData)
{
LOG(Warning, "Failed to load image.");
@@ -180,20 +180,29 @@ bool TextureTool::ImportTextureStb(ImageType type, const StringView& path, Textu
}
// Setup texture data
textureData.Width = x;
textureData.Height = y;
textureData.Width = width;
textureData.Height = height;
textureData.Depth = 1;
textureData.Format = PixelFormat::R8G8B8A8_UNorm;
textureData.Items.Resize(1);
textureData.Items[0].Mips.Resize(1);
auto& mip = textureData.Items[0].Mips[0];
mip.RowPitch = sizeof(Color32) * x;
mip.DepthPitch = mip.RowPitch * y;
mip.Lines = y;
mip.RowPitch = sizeof(Color32) * width;
mip.DepthPitch = mip.RowPitch * height;
mip.Lines = height;
mip.Data.Copy(stbData, mip.DepthPitch);
#if USE_EDITOR
// TODO: detect hasAlpha
// Detect alpha channel usage
auto ptrAlpha = (Color32*)mip.Data.Get();
for (int32 y = 0; y < height && !hasAlpha; y++)
{
for (int32 x = 0; x < width && !hasAlpha; x++)
{
hasAlpha |= ptrAlpha->A < 255;
ptrAlpha++;
}
}
#endif
stbi_image_free(stbData);