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ContentCAO: Fix threshold of alpha channel textures (#14213) 

With disabled shaders, the material EMT_TRANSPARENT_ALPHA_CHANNEL uses the
parameter as an alpha threshold to decide whether to draw the texture.
Thus lowering this limit fixes the issue of vanishing textures below alpha 128.
This commit is contained in:
SmallJoker 2024-01-10 19:34:52 +01:00 committed by GitHub
parent 0d41996562
commit a7eaee77ca
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 12 additions and 5 deletions
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16
src/client/content_cao.cpp
View File

@ -620,6 +620,8 @@ void GenericCAO::addToScene(ITextureSource *tsrc, scene::ISceneManager *smgr)
infostream << "GenericCAO::addToScene(): " << m_prop.visual << std::endl;
m_material_type_param = 0.5f; // May cut off alpha < 128 depending on m_material_type
if (m_enable_shaders) {
IShaderSource *shader_source = m_client->getShaderSource();
MaterialType material_type;
@ -634,8 +636,12 @@ void GenericCAO::addToScene(ITextureSource *tsrc, scene::ISceneManager *smgr)
u32 shader_id = shader_source->getShader("object_shader", material_type, NDT_NORMAL);
m_material_type = shader_source->getShaderInfo(shader_id).material;
} else {
m_material_type = (m_prop.use_texture_alpha) ?
video::EMT_TRANSPARENT_ALPHA_CHANNEL : video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
if (m_prop.use_texture_alpha) {
m_material_type = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
m_material_type_param = 1.0f / 256.f; // minimal alpha for texture rendering
} else {
m_material_type = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
}
}
auto grabMatrixNode = [this] {
@ -1341,7 +1347,7 @@ void GenericCAO::updateTextures(std::string mod)
video::SMaterial &material = m_spritenode->getMaterial(0);
material.MaterialType = m_material_type;
material.MaterialTypeParam = 0.5f;
material.MaterialTypeParam = m_material_type_param;
material.setTexture(0, tsrc->getTextureForMesh(texturestring));
// This allows setting per-material colors. However, until a real lighting
@ -1377,7 +1383,7 @@ void GenericCAO::updateTextures(std::string mod)
// Set material flags and texture
video::SMaterial &material = m_animated_meshnode->getMaterial(i);
material.MaterialType = m_material_type;
material.MaterialTypeParam = 0.5f;
material.MaterialTypeParam = m_material_type_param;
material.TextureLayers[0].Texture = texture;
material.Lighting = true;
material.BackfaceCulling = m_prop.backface_culling;
@ -1421,7 +1427,7 @@ void GenericCAO::updateTextures(std::string mod)
// Set material flags and texture
video::SMaterial &material = m_meshnode->getMaterial(i);
material.MaterialType = m_material_type;
material.MaterialTypeParam = 0.5f;
material.MaterialTypeParam = m_material_type_param;
material.Lighting = false;
material.setTexture(0, tsrc->getTextureForMesh(texturestring));
material.getTextureMatrix(0).makeIdentity();

1
src/client/content_cao.h
View File

@ -130,6 +130,7 @@ private:
bool m_is_visible = false;
// Material
video::E_MATERIAL_TYPE m_material_type;
f32 m_material_type_param;
// Settings
bool m_enable_shaders = false;