55 lines
1.7 KiB
C++
55 lines
1.7 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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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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bool create(Status* st = nullptr) 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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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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};
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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) 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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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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};
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} // namespace plot::render
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