(
name: "Highlight",
resources: [
(
name: "frameTexture",
kind: Texture(kind: Sampler2D, fallback: White),
binding: 0
),
(
name: "properties",
kind: PropertyGroup([
(name: "worldViewProjection", kind: Matrix4()),
(name: "color", kind: Vector4()),
]),
binding: 0
),
],
passes: [
(
name: "Primary",
draw_parameters: DrawParameters(
cull_face: None,
color_write: ColorMask(
red: true,
green: true,
blue: true,
alpha: true,
),
depth_write: false,
stencil_test: None,
depth_test: None,
blend: Some(BlendParameters(
func: BlendFunc(
sfactor: SrcAlpha,
dfactor: OneMinusSrcAlpha,
alpha_sfactor: SrcAlpha,
alpha_dfactor: OneMinusSrcAlpha,
),
equation: BlendEquation(
rgb: Add,
alpha: Add
)
)),
stencil_op: StencilOp(
fail: Keep,
zfail: Keep,
zpass: Keep,
write_mask: 0xFFFF_FFFF,
),
scissor_box: None
),
vertex_shader:
r#"
layout(location = 0) in vec3 vertexPosition;
layout(location = 1) in vec2 vertexTexCoord;
out vec2 texCoord;
void main()
{
texCoord = vertexTexCoord;
gl_Position = properties.worldViewProjection * vec4(vertexPosition, 1.0);
}
"#,
fragment_shader:
r#"
layout (location = 0) out vec4 outColor;
in vec2 texCoord;
void main() {
ivec2 size = textureSize(frameTexture, 0);
float w = 1.0 / float(size.x);
float h = 1.0 / float(size.y);
float n[9];
n[0] = texture(frameTexture, texCoord + vec2(-w, -h)).a;
n[1] = texture(frameTexture, texCoord + vec2(0.0, -h)).a;
n[2] = texture(frameTexture, texCoord + vec2(w, -h)).a;
n[3] = texture(frameTexture, texCoord + vec2( -w, 0.0)).a;
n[4] = texture(frameTexture, texCoord).a;
n[5] = texture(frameTexture, texCoord + vec2(w, 0.0)).a;
n[6] = texture(frameTexture, texCoord + vec2(-w, h)).a;
n[7] = texture(frameTexture, texCoord + vec2(0.0, h)).a;
n[8] = texture(frameTexture, texCoord + vec2(w, h)).a;
float sobel_edge_h = n[2] + (2.0 * n[5]) + n[8] - (n[0] + (2.0 * n[3]) + n[6]);
float sobel_edge_v = n[0] + (2.0 * n[1]) + n[2] - (n[6] + (2.0 * n[7]) + n[8]);
float sobel = sqrt((sobel_edge_h * sobel_edge_h) + (sobel_edge_v * sobel_edge_v));
outColor = vec4(properties.color.rgb, properties.color.a * sobel);
}
"#,
)
]
)