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export const description = `Test culling and rasterization state.
Test coverage:
Test all culling combinations of GPUFrontFace and GPUCullMode show the correct output.
Use 2 triangles with different winding orders:
- Test that the counter-clock wise triangle has correct output for:
- All FrontFaces (ccw, cw)
- All CullModes (none, front, back)
- All depth stencil attachment types (none, depth24plus, depth32float, depth24plus-stencil8)
- Some primitive topologies (triangle-list, TODO: triangle-strip)
- Test that the clock wise triangle has correct output for:
- All FrontFaces (ccw, cw)
- All CullModes (none, front, back)
- All depth stencil attachment types (none, depth24plus, depth32float, depth24plus-stencil8)
- Some primitive topologies (triangle-list, TODO: triangle-strip)
`;
import { makeTestGroup } from '../../../../common/framework/test_group.js';
import { kTextureFormatInfo } from '../../../capability_info.js';
import { GPUTest } from '../../../gpu_test.js';
function faceIsCulled(face: 'cw' | 'ccw', frontFace: GPUFrontFace, cullMode: GPUCullMode): boolean {
return cullMode !== 'none' && (frontFace === face) === (cullMode === 'front');
}
function faceColor(face: 'cw' | 'ccw', frontFace: GPUFrontFace, cullMode: GPUCullMode): Uint8Array {
// front facing color is green, non front facing is red, background is blue
const isCulled = faceIsCulled(face, frontFace, cullMode);
if (!isCulled && face === frontFace) {
return new Uint8Array([0x00, 0xff, 0x00, 0xff]);
} else if (isCulled) {
return new Uint8Array([0x00, 0x00, 0xff, 0xff]);
} else {
return new Uint8Array([0xff, 0x00, 0x00, 0xff]);
}
}
export const g = makeTestGroup(GPUTest);
g.test('culling')
.desc(
`
TODO: test triangle-strip as well [1]
TODO: check the contents of the depth and stencil outputs [2]
`
)
.params(
u =>
u
.combine('frontFace', ['ccw', 'cw'] as const)
.combine('cullMode', ['none', 'front', 'back'] as const)
.beginSubcases()
.combine('depthStencilFormat', [
null,
'depth24plus',
'depth32float',
'depth24plus-stencil8',
] as const)
.combine('primitiveTopology', ['triangle-list'] as const) // [1]
)
.fn(t => {
const size = 4;
const format = 'rgba8unorm';
const texture = t.device.createTexture({
size: { width: size, height: size, depthOrArrayLayers: 1 },
format,
usage: GPUTextureUsage.RENDER_ATTACHMENT | GPUTextureUsage.COPY_SRC,
});
let depthTexture: GPUTexture | undefined = undefined;
let depthStencilAttachment: GPURenderPassDepthStencilAttachment | undefined = undefined;
if (t.params.depthStencilFormat) {
depthTexture = t.device.createTexture({
size: { width: size, height: size, depthOrArrayLayers: 1 },
format: t.params.depthStencilFormat,
usage: GPUTextureUsage.RENDER_ATTACHMENT,
});
depthStencilAttachment = {
view: depthTexture.createView(),
depthClearValue: 1.0,
depthLoadOp: 'clear',
depthStoreOp: 'store',
};
if (t.params.depthStencilFormat && kTextureFormatInfo[t.params.depthStencilFormat].stencil) {
depthStencilAttachment.stencilClearValue = 0;
depthStencilAttachment.stencilLoadOp = 'clear';
depthStencilAttachment.stencilStoreOp = 'store';
}
}
const encoder = t.device.createCommandEncoder();
const pass = encoder.beginRenderPass({
colorAttachments: [
{
view: texture.createView(),
clearValue: { r: 0.0, g: 0.0, b: 1.0, a: 1.0 },
loadOp: 'clear',
storeOp: 'store',
},
],
depthStencilAttachment,
});
// Draw two triangles with different winding orders:
// 1. The top-left one is counterclockwise (CCW)
// 2. The bottom-right one is clockwise (CW)
pass.setPipeline(
t.device.createRenderPipeline({
layout: 'auto',
vertex: {
module: t.device.createShaderModule({
code: `
@vertex fn main(
@builtin(vertex_index) VertexIndex : u32
) -> @builtin(position) vec4<f32> {
var pos : array<vec2<f32>, 6> = array<vec2<f32>, 6>(
vec2<f32>(-1.0, 1.0),
vec2<f32>(-1.0, 0.0),
vec2<f32>( 0.0, 1.0),
vec2<f32>( 0.0, -1.0),
vec2<f32>( 1.0, 0.0),
vec2<f32>( 1.0, -1.0));
return vec4<f32>(pos[VertexIndex], 0.0, 1.0);
}`,
}),
entryPoint: 'main',
},
fragment: {
module: t.device.createShaderModule({
code: `
@fragment fn main(
@builtin(front_facing) FrontFacing : bool
) -> @location(0) vec4<f32> {
var color : vec4<f32>;
if (FrontFacing) {
color = vec4<f32>(0.0, 1.0, 0.0, 1.0);
} else {
color = vec4<f32>(1.0, 0.0, 0.0, 1.0);
}
return color;
}`,
}),
entryPoint: 'main',
targets: [{ format }],
},
primitive: {
topology: t.params.primitiveTopology,
frontFace: t.params.frontFace,
cullMode: t.params.cullMode,
},
depthStencil: depthTexture
? { format: t.params.depthStencilFormat as GPUTextureFormat }
: undefined,
})
);
pass.draw(6, 1, 0, 0);
pass.end();
t.device.queue.submit([encoder.finish()]);
// front facing color is green, non front facing is red, background is blue
const kCCWTriangleTopLeftColor = faceColor('ccw', t.params.frontFace, t.params.cullMode);
t.expectSinglePixelIn2DTexture(
texture,
format,
{ x: 0, y: 0 },
{ exp: kCCWTriangleTopLeftColor }
);
const kCWTriangleBottomRightColor = faceColor('cw', t.params.frontFace, t.params.cullMode);
t.expectSinglePixelIn2DTexture(
texture,
format,
{ x: size - 1, y: size - 1 },
{ exp: kCWTriangleBottomRightColor }
);
// [2]: check the contents of the depth and stencil outputs
});
|
