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Thomas Harte
59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
//
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// CopyShader.hpp
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// Clock Signal Kiosk
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//
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// Created by Thomas Harte on 29/01/2026.
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// Copyright © 2026 Thomas Harte. All rights reserved.
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//
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#pragma once
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#include "Outputs/OpenGL/Primitives/VertexArray.hpp"
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#include "Outputs/OpenGL/Primitives/Shader.hpp"
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#include <optional>
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namespace Outputs::Display::OpenGL {
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/*!
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Copies a source texture in its entirety to a destination, optionally applying
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a change in brightness and a gamma adjustment.
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This always copies the entirety of the source texture to the entirety of the
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target surface; hence no inputs are required to the vertex program. Simply
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issue a four-vertex triangle strip.
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TODO: consider colour adaptations beyond mere brightness.
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I want at least a 'tint' and am considering a full-on matrix application for any
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combination of tint, brightness and channel remapping — e.g. imagine a
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handheld console in which the native red pixels are some colour other than
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pure red.
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(would need support in the ScanTarget modals and therefore also a correlated
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change in the other scan targets)
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*/
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class CopyShader {
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public:
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CopyShader(
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API,
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std::optional<float> brightness, // Optionally: multiply all input
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std::optional<float> gamma
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);
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CopyShader() = default;
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CopyShader(CopyShader &&) = default;
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CopyShader &operator =(CopyShader &&) = default;
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void perform(const GLenum source);
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bool empty() const {
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return shader_.empty();
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}
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private:
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Shader shader_;
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VertexArray vertices_;
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GLenum source_ = 0;
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};
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}
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