What i’m trying to do is write to a storage texture in one render pass, and then read from this texture in a second pass, but value i get in the second pass is always the same, regardless of what i write in the first pass.
This is what setup code looks like:
const storageTexture = this._device.createTexture({
dimension: '2d',
size: [512, 512, 1],
format: 'r32float',
usage: GPUTextureUsage.STORAGE_BINDING
})
const textureView = storageTexture.createView({
dimension: '2d-array',
format: 'r32float',
})
const bindGroup = this.device.createBindGroup({
layout: this.lightsBindGroupLayout,
entries: [
.....irrelevant stuff
{
binding: 3,
resource: textureView,
},
],
})
const firstPass = commandEncoder.beginRenderPass(this._renderPassDescriptor)
......
firstPass.setBindGroup(2, bindGroup)
......
firstPass.end()
const secondPass = commandEncoder.beginRenderPass(this._renderPassDescriptor)
.....
secondPass.setBindGroup(3, bindGroup)
.....
secondPass.end()
Fragment shader code for first pass:
@fragment
fn fragment_main(in: VertexOutput) -> @location(0) float4 {
textureStore(texture, vec2u(0, 0), 0, vec4f(1, 1, 1, 1));
return in.position;
}
Fragment shader code for second pass:
@fragment
fn fragment_main(in: VertexOutput) -> @location(0) float4 {
let a = textureLoad(texture, vec2u(0, 0), 0);
return vec4(a.r, 0, 0, 0);
}
What i expected to get in the second pass is a.r == 1, therefore all fragments of the resulting image should be red, but what i actually get is a.r == 0, and all fragments are black.
I read about default value for r32float that is returned in case there is a reading error, and it’s also mentioned that if there’s a writing error, the textureStore function is not called. Right now, i can`t even understand which of this cases i have, but i can’t see how could there be read/write error with a predefined location.
Any help in diagnosing what is wrong would be much appreciated.
