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| @@ -0,0 +1,57 @@ | ||
| /** | ||
| * Database of alpha-to-coverage patterns from different devices. | ||
| * | ||
| * Name of device -> | ||
| * Array of patterns from a=0.0 to a=1.0, evenly spaced, excluding endpoints -> | ||
| * Array of N*N masks depending on the block size of the pattern used | ||
| * (in row-major order) | ||
| */ | ||
| export const alphaToCoverageDatabase: { [k: string]: PatternSequence } = { | ||
| 'NVIDIA GeForce RTX 3070': [[0b1000], [0b1001], [0b1011]], | ||
| 'Intel HD Graphics 4400': [[0b0001], [0b0011], [0b0111]], | ||
| }; | ||
|
|
||
| type PatternSequence = ReadonlyArray<Pattern>; | ||
| type Pattern = ReadonlyArray<Mask>; | ||
| type Mask = number; | ||
|
|
||
| /** | ||
| * For each device name, provides the source for a WGSL function which emulates | ||
| * the alpha-to-coverage algorithm of that device by mapping (alpha, x, y) to | ||
| * a sample mask. | ||
| */ | ||
| export const kEmulatedAlphaToCoverage = { | ||
| 'Apple M1 Pro': `\ | ||
| fn emulatedAlphaToCoverage(alpha: f32, x: u32, y: u32) -> u32 { | ||
| let u = x % 2; | ||
| let v = y % 2; | ||
| if (alpha < 0.5 / 16) { return ${0b0000}; } | ||
| // FIXME returning values out of an array is not working, always returns 0 | ||
| if (alpha < 1.5 / 16) { return array(array(${0b0001}u, ${0b0000}), array(${0b0000}, ${0b0000}))[v][u]; } | ||
| if (alpha < 2.5 / 16) { return array(array(${0b0001}u, ${0b0000}), array(${0b0000}, ${0b0001}))[v][u]; } | ||
| if (alpha < 3.5 / 16) { return array(array(${0b0001}u, ${0b0001}), array(${0b0000}, ${0b0001}))[v][u]; } | ||
| if (alpha < 4.5 / 16) { return array(array(${0b0001}u, ${0b0001}), array(${0b0001}, ${0b0001}))[v][u]; } | ||
| if (alpha < 5.5 / 16) { return array(array(${0b1001}u, ${0b0001}), array(${0b0001}, ${0b0001}))[v][u]; } | ||
| if (alpha < 6.5 / 16) { return array(array(${0b1001}u, ${0b0001}), array(${0b0001}, ${0b1001}))[v][u]; } | ||
| if (alpha < 7.5 / 16) { return array(array(${0b1001}u, ${0b1001}), array(${0b0001}, ${0b1001}))[v][u]; } | ||
| if (alpha < 8.5 / 16) { return array(array(${0b1001}u, ${0b1001}), array(${0b1001}, ${0b1001}))[v][u]; } | ||
| if (alpha < 9.5 / 16) { return array(array(${0b1011}u, ${0b1001}), array(${0b1001}, ${0b1001}))[v][u]; } | ||
| if (alpha < 10.5 / 16) { return array(array(${0b1011}u, ${0b1001}), array(${0b1001}, ${0b1011}))[v][u]; } | ||
| if (alpha < 11.5 / 16) { return array(array(${0b1011}u, ${0b1011}), array(${0b1001}, ${0b1011}))[v][u]; } | ||
| if (alpha < 12.5 / 16) { return array(array(${0b1011}u, ${0b1011}), array(${0b1011}, ${0b1011}))[v][u]; } | ||
| if (alpha < 13.5 / 16) { return array(array(${0b1111}u, ${0b1011}), array(${0b1011}, ${0b1011}))[v][u]; } | ||
| if (alpha < 14.5 / 16) { return array(array(${0b1111}u, ${0b1011}), array(${0b1011}, ${0b1111}))[v][u]; } | ||
| if (alpha < 15.5 / 16) { return array(array(${0b1111}u, ${0b1111}), array(${0b1011}, ${0b1111}))[v][u]; } | ||
| return ${0b1111}; | ||
| } | ||
| `.trimEnd(), | ||
| 'NVIDIA GeForce RTX 3070': `\ | ||
| fn emulatedAlphaToCoverage(alpha: f32, x: u32, y: u32) -> u32 { | ||
| if (alpha < 0.5 / 4) { return ${0b0000}; } | ||
| if (alpha < 1.5 / 4) { return ${0b1000}; } | ||
| if (alpha < 2.5 / 4) { return ${0b1001}; } | ||
| if (alpha < 3.5 / 4) { return ${0b1011}; } | ||
| return ${0b1111}; | ||
| } | ||
| `.trimEnd(), | ||
| }; |
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sample/alphaToCoverage/renderWithEmulatedAlphaToCoverage.wgsl
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,30 @@ | ||
| struct Varying { | ||
| @builtin(position) pos: vec4f, | ||
| // Color from instance-step-mode vertex buffer | ||
| @location(0) color: vec4f, | ||
| } | ||
|
|
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| @vertex | ||
| fn vmain( | ||
| @builtin(vertex_index) vertex_index: u32, | ||
| @location(0) color: vec4f, | ||
| ) -> Varying { | ||
| var square = array( | ||
| vec2f(-1, -1), vec2f(-1, 1), vec2f( 1, -1), | ||
| vec2f( 1, -1), vec2f(-1, 1), vec2f( 1, 1), | ||
| ); | ||
|
|
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| return Varying(vec4(square[vertex_index], 0, 1), color); | ||
| } | ||
|
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| struct FragOut { | ||
| @location(0) color: vec4f, | ||
| @builtin(sample_mask) mask: u32, | ||
| } | ||
|
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| @fragment | ||
| fn fmain(vary: Varying) -> FragOut { | ||
| let mask = emulatedAlphaToCoverage(vary.color.a, u32(vary.pos.x), u32(vary.pos.y)); | ||
| return FragOut(vec4f(vary.color.rgb, 1.0), mask); | ||
| } | ||
|
|
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