Yuval Tassa
6c86e12567
PiperOrigin-RevId: 956489408 Change-Id: I948493587eb154cac6e0fc31d5df987967405ff8
59 lines
2.1 KiB
Plaintext
59 lines
2.1 KiB
Plaintext
// Copyright 2026 DeepMind Technologies Limited
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// This material writes the the screen-space position of each fragment as the
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// output color of that fragment. This will provide us with the initial data for
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// the Jump Flood Algorithm. See "outline_jumpflood.mat" for more details.
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//
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// Depth is also written so that the render target's depth attachment holds the
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// depth of the selected objects; "outline_composite.mat" samples it to dim
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// occluded portions of the outline.
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material {
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name : outline_flatten,
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shadingModel : unlit,
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culling : none,
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depthWrite : true
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}
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fragment {
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// Encode a vec2 value with the range [0-1] into a 32-bit (RGBA) value.
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// We do this by packing each coordinate into a 16-bit value. Values are
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// adjusted to ensure [0x0000] is reserved for "untouched" pixels rather
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// than the pixel at the position (0, 0).
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vec4 pack(vec2 value) {
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// Scale and bias the value to avoid (0,0,0,0).
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vec2 adjusted = value * 0.999 + 0.001;
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// Pack float [0, 1] into two 8-bit channels.
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float val_x = adjusted.x * 255.0;
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float r_x = floor(val_x) / 255.0;
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float g_x = fract(val_x);
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float val_y = adjusted.y * 255.0;
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float r_y = floor(val_y) / 255.0;
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float g_y = fract(val_y);
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return vec4(r_x, g_x, r_y, g_y);
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}
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void material(inout MaterialInputs material) {
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prepareMaterial(material);
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// Get the screen-space position of the fragment, normalized to [0-1].
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vec2 uv = gl_FragCoord.xy * frameUniforms.resolution.zw;
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material.baseColor = pack(uv);
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}
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}
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