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[glsl-out] Workaround lod array shadow as textureGrad

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This commit is contained in:
Igor Shaposhnik
2021-03-08 19:45:04 +00:00
committed by Dzmitry Malyshau
parent e7c1415ca4
commit f586d3e240
1 changed files with 29 additions and 3 deletions
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32
src/back/glsl/mod.rs
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@@ -1340,12 +1340,24 @@ impl<'a, W: Write> Writer<'a, W> {
} => {
//TODO: handle MS
// textureLod on sampler2DArrayShadow and samplerCubeShadow does not exist in GLSL.
// To emulate this, we will have to use textureGrad with a constant gradient of 0.
let workaround_lod_array_shadow_as_grad =
array_index.is_some() && depth_ref.is_some();
//Write the function to be used depending on the sample level
let fun_name = match level {
crate::SampleLevel::Auto | crate::SampleLevel::Bias(_) => "texture",
crate::SampleLevel::Zero | crate::SampleLevel::Exact(_) => "textureLod",
crate::SampleLevel::Zero | crate::SampleLevel::Exact(_) => {
if workaround_lod_array_shadow_as_grad {
"textureGrad"
} else {
"textureLod"
}
}
crate::SampleLevel::Gradient { .. } => "textureGrad",
};
write!(self.out, "{}(", fun_name)?;
// Write the image that will be used
@@ -1385,9 +1397,23 @@ impl<'a, W: Write> Writer<'a, W> {
// Auto needs no more arguments
crate::SampleLevel::Auto => (),
// Zero needs level set to 0
crate::SampleLevel::Zero => write!(self.out, ", 0")?,
crate::SampleLevel::Zero => {
if workaround_lod_array_shadow_as_grad {
write!(self.out, ", vec2(0, 0), vec2(0,0)")?;
} else {
write!(self.out, ", 0")?;
}
}
// Exact and bias require another argument
crate::SampleLevel::Exact(expr) | crate::SampleLevel::Bias(expr) => {
crate::SampleLevel::Exact(expr) => {
if workaround_lod_array_shadow_as_grad {
write!(self.out, ", vec2(0, 0), vec2(0,0)")?;
} else {
write!(self.out, ", ")?;
self.write_expr(expr, ctx)?;
}
}
crate::SampleLevel::Bias(expr) => {
write!(self.out, ", ")?;
self.write_expr(expr, ctx)?;
}