mirror of
https://github.com/italicsjenga/vello.git
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ef3ed3c9d7
This is a checkpoint of partly completed work. Much of the GPU side is done, very little of the CPU side. For clips, the clip_els bindings (binding 6 of draw_leaf) are not added. Clip logic is missing from coarse. The overflow buffer is missing from fine, as is its size calculation in coarse (but it should work as long as the max depth fits within BLEND_STACK_SPLIT). For gradients, the texture binding is missing (binding 6) is missing from fine, as is the infrastructure in engine to deal with texture resources, and of course porting over the logic to fill it. The code is not tested, bugs may lurk.
73 lines
1.5 KiB
WebGPU Shading Language
73 lines
1.5 KiB
WebGPU Shading Language
// Copyright 2022 Google LLC
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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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// https://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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//
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// Also licensed under MIT license, at your choice.
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// Layout of per-tile command list
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// Initial allocation, in u32's.
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let PTCL_INITIAL_ALLOC = 64u;
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let PTCL_INCREMENT = 256u;
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// Amount of space taken by jump
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let PTCL_HEADROOM = 2u;
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// Tags for PTCL commands
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let CMD_END = 0u;
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let CMD_FILL = 1u;
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let CMD_STROKE = 2u;
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let CMD_SOLID = 3u;
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let CMD_COLOR = 5u;
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let CMD_LIN_GRAD = 6u;
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let CMD_RAD_GRAD = 7u;
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let CMD_BEGIN_CLIP = 9u;
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let CMD_END_CLIP = 10u;
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let CMD_JUMP = 11u;
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// The individual PTCL structs are written here, but read/write is by
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// hand in the relevant shaders
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struct CmdFill {
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tile: u32,
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backdrop: i32,
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}
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struct CmdStroke {
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tile: u32,
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half_width: f32,
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}
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struct CmdJump {
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new_ix: u32,
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}
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struct CmdColor {
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rgba_color: u32,
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}
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struct CmdLinGrad {
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index: u32,
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line_x: f32,
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line_y: f32,
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line_c: f32,
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}
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struct CmdRadGrad {
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index: u32,
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matrx: vec4<f32>,
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xlat: vec2<f32>,
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c1: vec2<f32>,
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ra: f32,
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roff: f32,
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}
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