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Add a points example #388

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merged 2 commits into from
Mar 11, 2024
Merged

Add a points example #388

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fb55b62
Add a points example
greggman Mar 9, 2024
0fa0c0f
remove defaults
greggman Mar 11, 2024
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37 changes: 37 additions & 0 deletions sample/points/distance-sized-points.vert.wgsl
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Original file line number Diff line number Diff line change
@@ -0,0 +1,37 @@
struct Vertex {
@location(0) position: vec4f,
};

struct Uniforms {
matrix: mat4x4f,
resolution: vec2f,
size: f32,
};

struct VSOutput {
@builtin(position) position: vec4f,
@location(0) texcoord: vec2f,
};

@group(0) @binding(0) var<uniform> uni: Uniforms;

@vertex fn vs(
vert: Vertex,
@builtin(vertex_index) vNdx: u32,
) -> VSOutput {
let points = array(
vec2f(-1, -1),
vec2f( 1, -1),
vec2f(-1, 1),
vec2f(-1, 1),
vec2f( 1, -1),
vec2f( 1, 1),
);
var vsOut: VSOutput;
let pos = points[vNdx];
let clipPos = uni.matrix * vert.position;
let pointPos = vec4f(pos * uni.size / uni.resolution, 0, 0);
vsOut.position = clipPos + pointPos;
vsOut.texcoord = pos * 0.5 + 0.5;
return vsOut;
}
37 changes: 37 additions & 0 deletions sample/points/fixed-size-points.vert.wgsl
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Original file line number Diff line number Diff line change
@@ -0,0 +1,37 @@
struct Vertex {
@location(0) position: vec4f,
};

struct Uniforms {
matrix: mat4x4f,
resolution: vec2f,
size: f32,
};

struct VSOutput {
@builtin(position) position: vec4f,
@location(0) texcoord: vec2f,
};

@group(0) @binding(0) var<uniform> uni: Uniforms;

@vertex fn vs(
vert: Vertex,
@builtin(vertex_index) vNdx: u32,
) -> VSOutput {
let points = array(
vec2f(-1, -1),
vec2f( 1, -1),
vec2f(-1, 1),
vec2f(-1, 1),
vec2f( 1, -1),
vec2f( 1, 1),
);
var vsOut: VSOutput;
let pos = points[vNdx];
let clipPos = uni.matrix * vert.position;
let pointPos = vec4f(pos * uni.size / uni.resolution * clipPos.w, 0, 0);
vsOut.position = clipPos + pointPos;
vsOut.texcoord = pos * 0.5 + 0.5;
return vsOut;
}
27 changes: 27 additions & 0 deletions sample/points/index.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>webgpu-samples: points</title>
<style>
html, body {
margin: 0; /* remove default margin */
height: 100%; /* make body fill the browser window */
display: flex;
place-content: center center;
}
canvas {
width: 600px;
height: 600px;
max-width: 100%;
display: block;
}
</style>
<script defer src="main.js" type="module"></script>
<script defer type="module" src="../../js/iframe-helper.js"></script>
</head>
<body>
<canvas></canvas>
</body>
</html>
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