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[glsl-in] Cast grad sampling on shadow image into zero sampling

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This commit is contained in:
João Capucho
2021-08-19 22:22:41 +01:00
committed by Dzmitry Malyshau
parent a741e4b86d
commit 0dd32219c5
1 changed files with 19 additions and 5 deletions
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24
src/front/glsl/builtins.rs
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@@ -342,7 +342,7 @@ pub fn inject_builtin(declaration: &mut FunctionDeclaration, module: &mut Module
declaration
.overloads
.push(module.add_builtin(args, MacroCall::TextureGrad))
.push(module.add_builtin(args, MacroCall::TextureGrad(shadow)))
}
}
"textureSize" => {
@@ -1351,7 +1351,7 @@ pub enum MacroCall {
Texture,
TextureLod,
TextureProj,
TextureGrad,
TextureGrad(bool),
TextureSize,
TexelFetch,
MathFunction(MathFunction),
@@ -1385,7 +1385,7 @@ impl MacroCall {
ctx.samplers.insert(args[0], args[1]);
Ok(args[0])
}
MacroCall::Texture | MacroCall::TextureLod | MacroCall::TextureGrad => {
MacroCall::Texture | MacroCall::TextureLod => {
let comps = parser.coordinate_components(ctx, args[0], args[1], meta, body)?;
let level = match *self {
MacroCall::Texture => args
@@ -1393,11 +1393,25 @@ impl MacroCall {
.copied()
.map_or(SampleLevel::Auto, SampleLevel::Bias),
MacroCall::TextureLod => SampleLevel::Exact(args[2]),
MacroCall::TextureGrad => SampleLevel::Gradient {
_ => unreachable!(),
};
texture_call(ctx, args[0], level, comps, body, meta)
}
MacroCall::TextureGrad(shadow) => {
let comps = parser.coordinate_components(ctx, args[0], args[1], meta, body)?;
let level = match shadow {
true => {
log::debug!(
"Assuming gradients {:?} and {:?} are not greater than 1",
args[2],
args[3]
);
SampleLevel::Zero
}
false => SampleLevel::Gradient {
x: args[2],
y: args[3],
},
_ => unreachable!(),
};
texture_call(ctx, args[0], level, comps, body, meta)
}