73 lines
2.8 KiB
C++
73 lines
2.8 KiB
C++
#pragma once
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#include <plot/core/status.hpp>
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#include <plot/core/types.hpp>
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#include <plot/gl/handle.hpp>
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#include <plot/render/buffer.hpp>
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namespace plot::render {
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/// Vertex array plus instance buffer of the line pipeline.
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///
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/// The attribute layout is fixed by the line shader (see shaders.hpp): `a_p0` at
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/// location 0 and `a_p1` at location 1, two floats each, advancing once per
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/// instance. A caller never writes a location, stride or offset; it stages a
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/// `LineBatch` and uploads its `data()`.
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///
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/// The instance buffer may sit behind either transfer strategy (see
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/// `UploadMode`). Only the mapped one moves the instances between slots, so
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/// `upload()` re-points the attributes when `InstanceStore::epoch()` changes and
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/// otherwise leaves them alone; the caller never has to know which path is live.
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class LineVertexArray {
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public:
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/// Creates the vertex array, the instance buffer and the attribute layout.
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/// `mode` selects the instance buffer's transfer strategy and defaults to the
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/// GL 3.3 baseline; a caller asking for `UploadMode::PersistentMapped` must
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/// have checked the context can do it (see `Renderer::init()`).
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bool create(Status* st = nullptr, UploadMode mode = UploadMode::Orphan) noexcept;
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/// Uploads `segments` instances from interleaved `x0,y0,x1,y1` floats and
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/// records how many the next draw should rasterise.
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void upload(const f32* interleaved, u32 segments) noexcept;
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void bind() const noexcept { vao_.bind(); }
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/// Records that the draw just issued read the instance buffer's current slot,
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/// which is what lets the mapped path reuse it safely. A no-op on the baseline
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/// path, so a caller always calls it the same way.
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void mark_drawn() noexcept { buffer_.mark_drawn(); }
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bool valid() const noexcept { return vao_.id() != 0; }
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u32 instance_count() const noexcept { return instances_; }
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private:
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LineBuffer buffer_;
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gl::VertexArray vao_;
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u32 instances_ = 0;
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/// Instance-buffer generation the attribute pointers currently point into.
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u32 epoch_ = 0;
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};
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/// Vertex array plus instance buffer of the text pipeline: `a_pos` at location 0
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/// and the glyph's atlas texel origin `a_uv` at location 1, two floats each,
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/// advancing once per instance.
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class TextVertexArray {
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public:
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bool create(Status* st = nullptr, UploadMode mode = UploadMode::Orphan) noexcept;
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/// Uploads `glyphs` instances from interleaved `x,y,u,v` floats.
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void upload(const f32* interleaved, u32 glyphs) noexcept;
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void bind() const noexcept { vao_.bind(); }
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void mark_drawn() noexcept { buffer_.mark_drawn(); }
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bool valid() const noexcept { return vao_.id() != 0; }
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u32 instance_count() const noexcept { return instances_; }
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private:
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TextBuffer buffer_;
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gl::VertexArray vao_;
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u32 instances_ = 0;
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u32 epoch_ = 0;
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};
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} // namespace plot::render
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