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Add color as uniform buffer for cube color (should be red) #1

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Add color as uniform buffer for cube color (should be red) #1

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21 changes: 21 additions & 0 deletions wgpu/examples/cube/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -178,6 +178,17 @@ impl framework::Example for Example {
},
count: None,
},
// color
wgpu::BindGroupLayoutEntry {
binding: 2,
visibility: wgpu::ShaderStages::FRAGMENT,
ty: wgpu::BindingType::Buffer {
ty: wgpu::BufferBindingType::Uniform,
has_dynamic_offset: false,
min_binding_size: None,
},
count: None,
},
],
});
let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
Expand Down Expand Up @@ -224,6 +235,12 @@ impl framework::Example for Example {
usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
});

let color_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: Some("Color Buffer"),
contents: bytemuck::cast_slice(glam::Vec4::new(1.0, 0.0, 0.0, 1.0).as_ref()),
usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
});

// Create bind group
let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
layout: &bind_group_layout,
Expand All @@ -236,6 +253,10 @@ impl framework::Example for Example {
binding: 1,
resource: wgpu::BindingResource::TextureView(&texture_view),
},
wgpu::BindGroupEntry {
binding: 2,
resource: color_buffer.as_entire_binding(),
},
],
label: None,
});
Expand Down
11 changes: 8 additions & 3 deletions wgpu/examples/cube/shader.wgsl
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Expand Up @@ -22,11 +22,16 @@ fn vs_main(
@binding(1)
var r_color: texture_2d<u32>;

@group(0) @binding(2)
var<uniform> u_color: vec4<f32>;

@fragment
fn fs_main(vertex: VertexOutput) -> @location(0) vec4<f32> {
let tex = textureLoad(r_color, vec2<i32>(vertex.tex_coord * 256.0), 0);
let v = f32(tex.x) / 255.0;
return vec4<f32>(1.0 - (v * 5.0), 1.0 - (v * 15.0), 1.0 - (v * 50.0), 1.0);
// let tex = textureLoad(r_color, vec2<i32>(vertex.tex_coord * 256.0), 0);
// let v = f32(tex.x) / 255.0;
// return vec4<f32>(1.0 - (v * 5.0), 1.0 - (v * 15.0), 1.0 - (v * 50.0), 1.0);

return u_color;
}

@fragment
Expand Down